WO1994028824A2 - Apparatus and method of inserting spinal implants - Google Patents
Apparatus and method of inserting spinal implants Download PDFInfo
- Publication number
- WO1994028824A2 WO1994028824A2 PCT/US1994/006345 US9406345W WO9428824A2 WO 1994028824 A2 WO1994028824 A2 WO 1994028824A2 US 9406345 W US9406345 W US 9406345W WO 9428824 A2 WO9428824 A2 WO 9428824A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- implant
- distractor
- spinal
- diameter
- tubular member
- Prior art date
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- A61B17/1671—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans for particular parts of the body for the spine
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Definitions
- the present invention relates to artificial fusion implants to be placed into the intervertebral space left remaining after the removal of a damaged spinal disc and specifically to the apparatus for and method of, inserting the implants. 2. Description of the Prior Art
- a fusion (the joining together of two or more bones via a continuous bridge of incorporated bone) may be performed.
- the interbody fusion wherein the disc is partially excised and bone placed within that space previously occupied by that disc material (between adjacent vertebrae) for the purpose of restoring a more normal spatial relationship, and to provide for stability; short term by mechanical support, and long term by the permanent cross bonding of bone from vertebra to vertebra.
- the purpose of the present invention is to provide an implant, and the apparatus and method of inserting the implant within the intervertebral space left after the removal of the disc material and permanently eliminate all motion at that location.
- the device of the present invention is space occupying within the disc interspace, rigid, self-stabilizing to resist dislodgement, stabilizing to the adjacent spinal vertebrae to eliminate local motion, and able to intrinsically participate in a vertebra to vertebra bony fusion so as to assure the permanency of the result.
- Patent No. 2,372,622 to FASSIO France describing a motion preserving implant comprising complimentary opposed convex and concave surfaces.
- these devices resemble the present invention only in that they are placed within the intervertebral space following the removal of a damaged disc. In that they seek to preserve spinal motion, they are diametrically different from the present invention which seeks to permanently eliminate all motion at that spinal segment.
- a second related area of prior art includes those devices utilized to replace essentially wholly removed vertebrae. Such removal is generally necessitated by extensive vertebral fractures, or tumors, and is not associated with the treatment of disc disease. While the present invention is to be placed within the disc space, these other vertebral devices cannot be placed within the disc space as at least one vertebra has already been removed such that there no longer remains a "disc space”. Furthermore, these devices are limited in that they seek to perform as temporary structural members mechanically replacing the removed vertebrae (not a removed disc) , and do not intrinsically participate in supplying osteogenic material to achieve cross vertebrae bony fusion.
- this second group of devices differs from the present invention in that they are vertebral replacements struts, do not intrinsically participate in the bony fusion, can only be inserted in the limited circumstances where an entire vertebra has been removed from the anterior approach, and are not designed for, or intended to be used for the treatment of disc disease.
- a third area of prior art related to the present invention includes all devices designed to be applied to one of the surfaces of the spine.
- Such devices include all types of plates, struts, and rods which are attached by hooks, wires and screws. These devices differ significantly from the present invention in that they are not inserted within the disc space and furthermore do not intrinsically participate in supplying osteogenic material for the fusion.
- none of these devices are designed to be nor can be used within the disc space. Moreover, these devices do not replace a damaged disc, and do not intrinsically participate in the generation of a bony fusion.
- Another area of related prior art to be considered is that of devices designed to be placed within the vertebral interspace following the removal of a damaged disc, and seeking to eliminate further motion at that location.
- the instrumentation of the present invention also makes overpenetration by the drill impossible.
- overpenetration in the cervical spine would result in the total paralysis or death of the patient.
- the result In the thoracic spine, the result would be complete paraplegia.
- the result In the lumbar spine, the result would be paraplegia or a life-threatening perforation of the aorta, vena cava, or iliac vessels.
- the present invention is atraumatically screwed into place while the BAGBY device, in contradistinction, is pounded into position.
- BAGBY describes that its implant is significantly larger in size than the hole drilled and must be pounded in. This is extremely dangerous and the pounding occurs directly over the spinal cord which is precariously vulnerable to percussive injury.
- the BAGBY device must always be pounded directly towards the spinal cord.
- the BAGBY device is pounded into a smooth hole under great resistance, and lacking any specific design features to secure it, the device is highly susceptible to forceful ejection which would result in great danger to the patient and clinical failure.
- the present invention in contradistinction, is securely screwed into place, and possesses highly specialized locking threads to make accidental dislodgement impossible. Because of the proximity of the spinal cord, spinal nerves, and blood vessels, any implant dislodgement as might occur with the BAGBY device might have catastrophic consequences.
- the BAGBY device can only be inserted from the front of the vertebral column, however, in contrast, the present invention can be utilized in the cervical, thoracic, and lumbar spine, and can be inserted from behind (posteriorly) in the lumbar spine. This is of great importance in that the purpose of these devices is in the treatment of disc disease and probably greater than 99 percent of all lumbar operations for the treatment of disc disease are performed from behind where the present invention can easily be utilized, but the BAGBY device, as per BAGBY'S description, cannot.
- Disc removal The BAGBY invention requires the complete removal of the disc prior to the drilling step, whereas the present invention eliminates the laborious separate process of disc removal and efficiently removes the disc and prepares the vertebral end plates in a single step. 4.
- Time required The present invention saves time over the BAGBY invention since time is not wasted laboring to remove the disc prior to initiating the fusion. Also, with the present invention the procedure is performed through a system of guarded instrumentation, time is not wasted constantly placing and replacing various soft tissue retractors throughout the procedure.
- Implant stability - Dislodgement of the implant would be a major source of device failure (an unsuccessful clinical result) , and might result in patient paralysis or even death.
- the BAGBY device lacks any specific means of achieving stability and since it is pounded in against resistance to achieve vertebral distraction, and is susceptible to forceful dislodgement by the tendency of the two distracted vertebrae, to return to their original positions squeezing out the device.
- the present invention is screwed into place. As there is no unscrewing force present between the vertebrae, compression alone cannot dislodge the implant.
- the implant is inherently stable by its design.
- the threads of the present invention are highly specialized in that they are periodically interrupted so that the tail ends of each of the tabs so formed are blunted and twisted so as to resist accidental unscrewing.
- the removal of an implant with such "locking threads” requires the use of a special extractor included within the instrumentation.
- the stability of the present invention is still further enhanced, again in contradistinction to the BAGBY device, by the presence of a "bone ingrowth” surface texturing, which both increases the friction of the fit and allows for the direct growth of the vertebral bone into the casing of the implant itself.
- the present invention is not only self-stabilizing, it also provides stability to the adjacent vertebrae in at least three ways that the BAGBY device cannot.
- the BAGBY device is placed transversely across the joint in the center, leaving both vertebrae free to rock back and forth over this round barrel shaped axis, much like a board over a barrel, being used for a seesaw.
- the BAGBY device may actually behave as a third body allowing the translation of the vertebrae relative to the device and to each other.
- any device can only provide stability if it remains properly, seated.
- the present invention is inherently stable, and therefore assures that it will stabilize the adjacent vertebrae, rather than, as with the BAGBY, the instability of the spine to be treated may cause a dislocation of the BAGBY implant, with further loss of spinal stability. 7.
- the collapse of the interspace While both the present invention and the BAGBY device can be fabricated to withstand the compression forces within the interspace, the interspace may nevertheless collapse under the superincumbent body weight as the implant settles into the vertebral bone. This is related to the load per unit area. Again the present invention is superior to the BAGBY device in at least four ways.
- the present invention offers considerably greater surface area to distribute the load.
- the BAGBY device is placed centrally, the present device is placed bilaterally where the bone tends to be more cortical and much stronger out towards the rim.
- the present invention supports the load achieving an "I" beam effect, whereas the BAGBY implant does not.
- it is not pressure alone that causes the collapse of the bone adjacent to the implant, but also bony erosion that is caused by the motion under pressure of the implant against the bone.
- the present invention alone is highly resistant to such motion, again diminishing the likelihood of erosion and interspace collapse.
- Bone ingrowth surface texturing The present invention has a surface treatment of known and conventional technology to induce the growth of bone from the vertebrae directly into the casing material of the implant itself.
- the BAGBY device has no similar feature. ⁇ L.A. - we may want to list examples of these bone growth factors ⁇ .
- Fusion mass The BAGBY invention calls for removing the disc and then drilling a hole between the adjacent vertebrae. The bony debris so generated is then put into the device.
- the present invention takes a core of pure bone producing marrow from the iliac crest, and then by use of a special press, forcibly injects the implant device with an extremely dense compressed core of that osteogenic material until the material itself virtually extrudes from every cell of the implant. 10.
- the probability of achieving fusion - The fusion rate within the spine is known to be related directly to the amount of exposed vascular bone bed area, the quality and quantity of the fusion mass available, and the extent of the stabilization obtained with all other factors being half constant.
- the fusion rate would be superior with the present invention as compared to the BAGBY device, because of optimal implant stability (#5) , optimal spinal stability (#6) , bone ingrowth surface treatment (#8) , superior fusion mass (#9) , and the greater exposed vertebral bony surface area (#7) .
- the implant of the present invention would utilize bone ingrowth technology, it would do so with conventional technology.
- Cloward's method of instrumentation was designed for, and limited to, use on the anterior aspect and in the region of the cervical spine only. The hole was midline, which would preclude its use posteriorly where the spinal cord would be in the way.
- Cloward's method As the bone graft to be inserted in Cloward's method was necessarily larger in diameter than the hole drilled, the graft could not be inserted through the drill guide. This mandated the removal of the drill guide and left the graft insertion phase completely unprotected. Thus Cloward's method and instrumentation was inappropriate for posterior application.
- Cloward's method inappropriate for posterior application.
- the drill guide described by Cloward could not be placed posteriorly within the spinal canal, as the foot plate would crush the nerves. Modifying Cloward's drill guide by removing the foot plate completely, would still leave the instrument unworkable as it would then lack stability, and would not be controllable for depth of seating.
- Wilterberger (Wilterberger, B.R., Abbott, K.H., "Dowel Intervertebral Fusion as Used in Lumbar Disc Surgery," The Journal of Bone and Joint Surgery. Volume 39A, pg. 234-292, 1957) described the unprotected drilling of a hole from the posterior into the lumbar spine between the nerve roots and across the disc space, and then inserting a stack of button-like dowels into that space. While Wilterberger had taken the Cloward concept of circular drilling and dowel fusion and applied it to the lumbar spine from a posterior approach, he had not provided for an improved method, nor had he advanced the instrumentation so as to make that procedure sufficiently safe, and it rapidly fell into disrepute.
- Crock Crock, H.V. , "Anterior Lumbar Interbody Fusion - Indications for its Use and notes on Surgical Technique," Clinical Orthopedics, Volume 165, pg. 157-163, 1981) described his technique and instrumentation for Anterior Interbody Fusion of the lumbar spine, wherein he drilled two large holes side by side across the disc space from anterior to posterior essentially unprotected and then pounded in two at least partially cylindrical grafts larger than the holes prepared.
- the present invention comprises a series of artificial implants, the purpose of which is to participate in, and directly cause bone fusion across an intervertebral space following the excision of a damaged disc.
- implants are structurally load bearing devices, stronger than bone, capable of withstanding the substantial forces generated within the spinal interspace.
- the devices of the present invention have a plurality of macro sized cells and openings, which can be loaded with fusion promoting materials, such as autogenous bone, for the purpose of materially influencing the adjacent vertebrae to perform a bony bond to the implants and to each other.
- the implant casing may be surface textured or otherwise treated by any of a number of known technologies to achieve a "bone ingrowth surface" to further enhance the stability of the implant and to expedite the fusion.
- the devices of the present invention are configured and designed so as to promote their own stability within the vertebral interspace and to resist being dislodged, and furthermore, to stabilize the adjacent spinal segments.
- the apparatus and method of the present invention for preparing the vertebrae for insertion of the implant allows for the rapid and safe removal of the disc, preparation of the vertebrae, performance of the fusion, and internal stabilization of the spinal segment.
- the present invention is a method for Interbody
- two distractors are used to separate two adjacent vertebrae to a preferred distance.
- a hollow Outer Sleeve having teeth at one end is driven into the adjacent vertebrae on one side to hold the vertebrae in position when the distractor is removed, a diameter reducing hollow Inner Sleeve is introduced into the Outer Sleeve, a drill having a drill stop is passed through the hollow Inner Sleeve to drill a hole to a desired depth, and an implant is inserted in the hole. The method is repeated on the other side of the disc.
- the present invention provides for a single surgery providing for an integrated discectomy, fusion, and interbody internal spinal fixation.
- the present invention is safer by providing protection of the surrounding tissues.
- An Outer Sleeve places all of the delicate soft tissue structures, nerves, blood vessels, and organs outside of the path of the various sharp surgical instruments and the implant. Further, it is an improvement upon hand held retractors in that it occupies the least possible amount of area, avoids the stretching associated with manual retraction, provides for the retraction and shielding of the surrounding tissues in all directions circu ferentially and simultaneously, and it does so exclusively with smooth, curved surfaces.
- the present invention is safer by providing protection against the danger of instrument or implant overpenetration. 3. The present invention is safer as the surgical site and wound are protected from the debris generated during the procedure. 4. The present invention is safer because the method provides for absolute protection to the soft tissues directly and from indirect injury by overpenetration. It makes safe the use of power instrumentation which is both more effective and efficient.
- the present invention maintains the vertebrae to be fused rigid throughout the procedure.
- the present invention holds the vertebrae to be fused aligned throughout the procedure. 7. The present invention holds the vertebrae to be fused distracted throughout the procedure.
- the present invention assures that all instruments introduced through the Outer Sleeve are coaxial and equally centered through the disc space and parallel the endplates.
- the present invention facilitates the implant insertion by countering the high compressive forces tending to collapse the interspace, which if left unchecked would resist the introduction and advancement of the implant and make stripping more likely.
- the present invention extends the range and use of the procedure and similarly the interbody spinal implant itself by making the procedure safe throughout the spine. 11.
- the present invention increases the ability to use a specifically sized implant.
- the design and use of a second or Inner Sleeve in the present invention allows for the difference in size between the inside diameter of the Outer Sleeve, and the outside diameter of the drill itself. This difference being necessary to accommodate the sum of the distraction to be produced, and the depth of the circumferential threading present of the implant.
- a specially designed drill bit with a central shaft recess allows for the safe collection of the drilling products, which can then be removed without disturbing the Outer Sleeve by removing the drill bit and Inner Sleeve as a single unit.
- a specially designed trephine for removing a core of bone slightly smaller in diameter than the internal diameter of the implant cavity itself, however of a greater length.
- a specially designed press for forcefully compressing and injecting the long core of autogenous bone into the implant, such that it extrudes through the implant itself.
- a specially designed driver extractor which attaches to the implant and allows the implant to be either inserted or removed without itself dissociating from the implant, except by the deliberate disengagement of the operator.
- predistraction increases the working space.
- the Distractor in the present invention is self-orienting acting as a directional finder.
- the Distractor in the present invention is self-centralizing between the opposed vertebral surfaces acting as a centering post for the subsequent bone removal.
- predistraction assures the equal removal of bone from the adjacent vertebral surfaces.
- predistraction assures the exact congruence between the hole drilled and the device.
- predistraction assures that the drilling is parallel to the vertebral endplates. 26. In the present invention predistraction allows for the determination of the optimal distraction prior to drilling.
- predistraction allows for the verification of the correct prosthesis size prior to drilling.
- predistraction facilitates device insertion by relieving the compressive loads across the interspace which would resist implantation.
- predistraction decreases the likelihood of stripping the bone during insertion.
- predistraction provides for the side by side positioning, spacing, and parallelism required prior to the irrevocable event of drilling.
- predistraction provides for the rigid stabilization of the vertebrae opposed to the disc space throughout the surgical procedure.
- predistraction provides for an implant easier to insert as the compressive loads of the opposed vertebrae are held in check so that the device itself need not drive the vertebrae apart to be inserted.
- predistraction allows for the insertion of a more effective implant as more of the implant can be dedicated to its intended purpose and be full diameter, whereas without the benefit of predistraction and the ability to maintain the same, a significant portion of the forward end of the implant would need to be dedicated to the purpose of separating the opposing vertebrae.
- the present invention allows for the use of an implant with a sharper thread or surface projections as there is no danger to the surrounding tissues. 35.
- the present invention allows for the implant to be fully preloaded as provided to the surgeon, or for the surgeon to load it with the material of his choice at the time of surgery. 36.
- the present invention allows for the loading of a spinal implant outside of the spinal canal and prior to implantation.
- Figure 1 is a side view of the Long Distractor, of the present invention inserted into the intervertebral space.
- Figure 2 is a side view of a Convertible Distractor assembly in relation to the spine.
- Figure 3 is a perspective view of a high retention Short Distractor of Figure 2.
- Figure 3A is a side view of the high retention Short Distractor of Figure 2.
- Figure 3B is a side view of an alternative Short Distractor with circumferential forward facing ratcheting.
- Figure 3C is a top view of the alternative Short Distractor of Figure 3B.
- Figure 3D is a perspective view of an alternative embodiment of a Short Distractor.
- Figure 3E is a top view of the alternative distractor of Figure 3D.
- Figure 3F is a side view of a further alternative rectangularized Short Distractor with knurled surfaces.
- Figure 4 is a perspective view of a spinal segment (two vertebrae and an interposed disc) with a Short Distractor in place, with a portion of the upper vertebrae and disc cut away to show the Short Distractor on one side of the spine and the Long Distractor about to be placed contralaterally.
- Figure 5 shows a side view of the Outer Sleeve in place over the Long Distractor, and about to receive the Driver Cap in preparation for being seated.
- Figure 6 shows the Long Distractor, Outer Sleeve, and Driver Cap following the proper seating of the Outer Sleeve into the two adjacent vertebrae.
- Figure 7A is a side view of the cervical Outer Sleeve being placed over a Long Distractor which is in place within the disc space anteriorly.
- Figure 7B is a bottom view of the single Outer Sleeve of Figure 7A.
- Figure 7C is a bottom view of a Dual Outer Sleeve.
- Figure 7D is an enlarged side view of the proximal portion of Figure 7C.
- Figure 7E is a bottom view of a Dual Driver Cap for driving two distractors.
- Figure 7F is a side sectional view showing the Dual Outer Sleeve of Figures 7C and 7D, Distractors and Dual Cap of Figure 7E seated.
- Figure 8 is a side view of the Outer Sleeve of Figure 7A centered on the Long Distractor and fully seated on the anterior aspect of the cervical spine.
- Figure 9 is a perspective view of the Distractor
- Figure 10 is a cutaway partial side view of the Proximal Puller engaging the extraction ring of the Long Distractor over the end of the Outer Sleeve.
- Figure 10A is a side view of the Puller coupled to the Long Distractor just prior to its extraction.
- Figure 10B is a posterior view of the proximal Outer Sleeve and a Short Distractor in place in regard to the vertebrae, disc and nerves.
- Figure 11A is a side sectional view of the Drill and Inner Sleeve within the Outer Sleeve and drilling across the intervertebral space and cutting partially cylindrical arcs from the adjacent vertebrae.
- Figure 11B is a sectional side view of preparation of the intervertebral space by the alternative "Trephine Method" showing the Distractor, Trephine, Inner Sleeve, and Outer Sleeve in place.
- Figure 11C is a sectional side view as in Figure
- Figure 11D is a side view of an instrument for removing arcs of bone from vertebrae following drilling.
- Figure 12 is a perspective view of the surgical Tap.
- Figure 13 is a side view of the Outer Sleeve and the surgical Tap fully threaded within the interspace.
- Figure 14A is a side view of the bone harvesting
- Figure 14B is a perspective view of the implant Bone Loading Device.
- Figure 14C is a perspective view of the Corkscrew bone freeing and extracting instrument.
- Figure 15 is a partial perspective view of the Bone Loading Device in operation.
- Figure 16 is a perspective view of the Implant Driver about to engage the spinal implant.
- Figure 17 is a side view of the spinal implant being fully seated within the intervertebral space by means of the Driver apparatus in place within the Outer Sleeve.
- Figure 18 is a side view of the lumbar spine showing the end result of the device implantation via the posterior route.
- the method of the present invention involves the following steps.
- the patient is placed on a spinal surgery frame, which allows for the distraction and alignment of the disc space to be fused.
- a bilateral posterior exposure of the interspace, with or without partial discectomy is then performed.
- Utilizing distractors the disc space is distracted, and a hollow Outer Sleeve is fitted over one of the distractors.
- the end of the Outer Sleeve has teeth for engaging the two adjacent vertebrae.
- the Outer Sleeve is driven into the vertebrae and the distractor is then removed.
- a hollow Inner Sleeve is then inserted into the Outer Sleeve and a stopped Drill is utilized to prepare the opposed vertebral surfaces.
- the Drill and the Inner Sleeve are removed as a single unit. The space is tapped if so required.
- the prepared spinal implant is then inserted via the Outer Sleeve utilizing a stopped inserter. The instruments are then removed and the procedure repeated on the contralateral side of the spine.
- Step la Prior to surgery, translucent implant templates appropriately adjusted for scale are superimposed on AP, lateral, and axial images of the interspace to be fused, for the purpose of selecting the optimal implant size and to determine the desired distraction.
- Step lb The patient is preferably placed onto a spinal surgery frame capable of inducing both distraction and vertebral alignment.
- Step 2 a standard bilateral (partial) discectomy is performed and any posterior lipping of the vertebral bodies adjacent the interspace is removed. Alternatively, no disc material need be removed.
- the interspace is exposed by performing bilateral paired semihemilaminotomies and resecting the inner aspects of the facet joints adjacent the spinal canal while preserving the supra and interspinous ligaments.
- Step 3 Beginning on the first side, the dural sac and traversing nerve root at that level are retracted medially and a Long Distractor then inserted and impacted flush to the posterior vertebral bodies adjacent that interspace. Long Distractors with working ends of increasing diameter are then sequentially inserted until the optimal distraction is obtained.
- This optimal distraction not only restores the normal height of the interspace, but further achieves a balance wherein the tendency for the space to collapse is resisted, which in urging the vertebral bodies apart is being equally resisted by the powerful soft tissue structures about the spinal segment including the outer casing of the disc (the annulus fibrosus) , various ligaments, capsular structures, as well as the muscles and other soft tissue structures.
- This balanced distraction not only provides for the spatial restoration of the height of the interspace, but for considerable stability as the space now resists further distraction or collapse.
- the use of the solid bodied Long Distractors is terminated and a disassemblable Convertible Distractor is placed with tactile and/or radiographic confirmation of ideal distraction.
- the Convertible Distractor is then disassembled such that the Short Distractor portion is left in place and the ultra-low profile head portion being positioned adjacent to the canal floor and safely away from the neural structures.
- various embodiments of the Short Distractor are available with varying degrees of resistance to dislodgment.
- Step 4 attention is then directed to the contralateral side of the spine.
- Step 4 On the contralateral side of the same interspace the Long Distractor having at its working end the diameter matching the Short Distractor already in place, is then inserted. If however, due to an asymmetrical collapse of the interspace it is then determined that greater distraction is required on the second side to achieve the optimal stability, then the appropriate Short Distractor would be placed on the second side. Then the Short Distractor would be removed from the first side and replaced with a larger Long Distractor so as to bring the interspace into balance.
- the entire procedure is performed on the one side of the spine utilizing only the Long Distractor prior to repeating the procedure on the contralateral side of the spine. While this method can be performed in accordance with the remaining steps as described in the preferred embodiment, when utilized it is best performed using a Trephine which allows the Long Distractor to remain in place, thereby allowing for interspace distraction otherwise provided in the first method by the Short Distractor.
- This alternative method then requires the use of a Trephine over the Long Distractor in lieu of a reamer and is therefore called the "Trephine Method", which will be discussed in detail later.
- Step 5 With the Short Distractor in place on the first side of the spine, and the matching Long Distractor in place on the second side of the spine, and with the dural sac and traversing nerve root safely retracted, the Outer Sleeve is placed over the Long Distractor and firmly impacted to its optimal depth using the Impaction Cap and a mallet. The Long Distractor is then removed. Step 6. An Inner Sleeve is then placed within the Outer Sleeve, and the interspace is then prepared on that side by utilizing a Drill, Endmill, Reamer, or Trephine to drill, ream, or cut out the bone to be removed to either side, as well as any remaining interposed discal material.
- a Drill, Endmill, Reamer, or Trephine to drill, ream, or cut out the bone to be removed to either side, as well as any remaining interposed discal material.
- Step 7 a thread forming Tap with penetration limiting means to control the depth of insertion, is then inserted through the Outer Sleeve.
- Step 8 The prepared implant is then inserted utilizing the specialized Driver unit.
- the implant may be coated with, made of, and/or loaded with substances consistent with bony fusion.
- the implant is treated with bone promoting and inducing substances, but is loaded with materials suitable for participating in a fusion. While substances both natural and artificial are covered by the present invention, the preferred embodiment is in regard to the use of the patient's own bone by the following method.
- a hollow Trephine is utilized to harvest a core of bone from the posterior superior aspect of the iliac crest adjacent the sacroiliac joint. This core of bone is at its outside diameter, slightly smaller than the inside diameter of the spinal implant to be loaded, but longer than the spinal implant.
- the core of bone is then injected from within the Trephine into the central cavity of the implant causing a superabundance of the bone material within the implant such that the bone material tends to press out through the openings communicating with the outside surface of the implant.
- Step 9 Using the Driver Extractor instrument, the prepared implant is threaded into the prepared interspace. The instrumentation is removed from that side of the spine and attention is then redirected to the first side of the spine. A small retractor is utilized to move the dural sac and traversing nerve root medially and to protect them and allowing the direct visualization of the retained Short Distractor unit. Without removing the Short Distractor, it is reassembled to its shaft portion, essentially reconstituting itself into a Long Distractor. With the inserted implant now acting as the distractor on the opposite side, the Long Distractor is utilized to guide the Outer Sleeve down where it is impacted as described in Step 5.
- Steps 6 & 7 are then repeated, completing the procedure at that level.
- the wound is then irrigated and closed in the routine manner.
- the Convertible Distractor would then be disassembled, the barrel and head portion removed, and the Short Distractor portion left deeply embedded and with its flanged head flat against the canal floor and deep to the neural structures. It would then be safe to allow the dural sac and nerve root to return to their normal positions, which would be superficial to the flanged portion of the Short Distractor.
- the dural sac and nerve root would then be retracted medially on this second side, and a Long Distractor with an 18mm diameter barrel portion and a 10mm working portion would then be inserted into the interspace and driven flush to the bone if necessary, such impaction imploding any osteophytes not already removed, and assuring that the shoulder portion of the barrel comes to lie flat against the posterior aspects of the adjacent bodies.
- the Outer Sleeve would then be placed over the Long Distractor and utilizing the Driver Cap and a mallet, seated to the optimal depth.
- the Long Distractor is then removed and the Inner Sleeve is inserted into the Outer Sleeve.
- the Inner Sleeve Since the purpose of the Inner Sleeve is to support the drill and allow for the increased size of the implant over the size of the drill, thus making it possible for the insertion of the implant to occur through the Outer Sleeve, the Inner Sleeve therefore measures 18mm in its outside diameter, and 16.6mm in its inside diameter. This allows it to fit within the Outer Sleeve, the diameter of which is 18.1 mm and to admit the drill bit which is 16.5mm in diameter.
- the Drill and Inner Sleeve are removed as a single unit with the trapped interposed cartilaginous and bony debris.
- the depth of drill penetration is preset and limited by the fixed rigid column of the Outer Sleeve.
- the space will be prepared to a depth of 28mm in anticipation of countersinking a 26mm long implant at least 2mm. If a Tap were to be utilized, it would be inserted at this time and be appropriate to the minor and major diameters of the implant to be inserted and as with the Drill, controlled for its depth of penetration.
- the spinal implant would then be prepared for implantation by utilizing a Trephine to harvest a core of posterior iliac bone greater than 30mm long and approximately 14.5mm in diameter.
- this core of bone would be forcefully injected into the internal chamber of the spinal implant which would then be capped. Cap end forward, the fully loaded implant would then be attached to the Insertion Driver, down the Outer Sleeve and screwed into place with the depth of penetration limited by the Insertion instrument. The Insertion Driver is then unscrewed from the implant and removed from the Outer Sleeve. With the dural sac and nerve root retracted and protected, the Outer Sleeve would then be removed. This would complete the fusion procedure on that side, and then as described, the procedure would be repeated on the other (first) side of the same interspace.
- Trephine Method An alternative and extremely useful method is the "Trephine Method". Its advantages include that it may be used in conjunction with the preferred embodiment substituting the use of a hollow, tubular cutter, called a Trephine for the use of the Drill in Step 5 of the preferred embodiment. Additionally, it may be utilized so as to obviate the need for the placement of the Short Distractor and to allow the procedure to be effectively performed from start to finish on one side prior to initiating the procedure on the opposite side, and while nevertheless maintaining distraction at the site of the bone removal.
- the dural sac and nerve root are retracted.
- the Outer Sleeve has an inner diameter only slightly greater than the implant to be inserted. Therefore, at this time, a first Inner Sleeve is inserted into the Outer Sleeve to make up the difference between the outside diameter of the Long Distractor and the inside diameter of the Outer Sleeve. With the Outer Sleeve and first Inner Sleeve thus assembled, they are placed over the Long Distractor and the Outer Sleeve is optimally seated using the Impaction Cap. The Cap and first Inner Sleeve are removed, but the Long Distractor and Outer Sleeve are left in place.
- a hollow, tubular cutter known as a Trephine is then inserted over the Long Distractor and its barrel portion and within the Outer Sleeve.
- the Trephine which is stopped out to the appropriate depth, can then be utilized to cut equal arcs of bone from the opposed vertebral endplates.
- a second Inner Sleeve may be placed within the Outer Sleeve prior to placing the Trephine over the Long Distractor and within that second sleeve. This second Inner Sleeve would be just greater in its internal diameter than the Long Distractor and just smaller in its outside diameter than the inner diameter of the Outer Sleeve.
- the Trephine, the Long Distractor, and the second Inner Sleeve, if utilized, are all removed. Since the Trephine cuts two arcs of bone but does not ream them out, a shafted instrument with a perpendicular cutting portion at its working end is then inserted parallel to the disc space and then rotated through an arc of motion cutting the bases of the two longitudinally cut arcs, thus freeing them for removal through the Outer Sleeve. The space may then be tapped if required, and the implant is inserted as per the preferred method. As already mentioned, the "Trephine Method" can be used with or without the use of the Short Distractor on the contralateral side.
- the following method is the preferred embodiment for performing anterior interbody fusion in the thoracic and lumbar spines. It is also appropriate in the cervical spine when the width of the spine anteriorly is sufficient so that it is possible to place two implants side by side and such that each intrudes at least several millimeters into the substance of the opposed vertebrae and for the length of the implants.
- the interspace to be fused is adequately exposed and the soft tissues and vital structures retracted and protected to either side.
- Visualization of the broad width of the interspace anteriorly is made possible by the absence of the neurological structures in relation to this aspect of the spine.
- the center line of the anterior aspect of the interspace is noted and marked.
- the disc is removed using first a knife and then curettes and rongeurs as needed. Alternatively, the disc may be left intact to be removed during the drilling stage of the procedure. However, as per the preferred embodiment of the procedure, having removed the great mass of the nucleus and the greater portion of the annulus anteriorly. Long Distractors with progressively increasing diameters to their working ends are inserted into the interspace at a point midway between the central marking line and the lateral extent of the anterior aspect of the spine as visualized.
- the Dual Outer Sleeve with its common Foot Plate and Retention Prongs is then inserted over either a singly placed Long Distractor and then the second Distractor placed, or is placed over both Distractors if already placed.
- the Dual Outer Sleeve is then seated firmly against the anterior aspect of the spine. Any spurs which would interfere with the flush seating of the Foot Plate to the anterior aspect of the spine should be removed prior to inserting the Long Distractors.
- an Inner Sleeve and drill bit Once the Outer Sleeve has been optimally seated, one of the Long Distractors is removed and in its place is inserted an Inner Sleeve and drill bit.
- the drill bit has as its outside diameter the minor diameter of the implant to be inserted.
- the Inner Sleeve is essentially equal in thickness to the difference between the minor and major diameters of the threaded implant.
- a Stopped Drill is then utilized to prepare the opposed vertebral surfaces and to remove any remaining disc material interposed. If required, a Stopped Tap may be inserted through the Outer Sleeve and into the interspace to create a thread form. The properly prepared implant is then affixed to the Insertion Driver and passed through the Outer Sleeve down into the interspace and inserted until its depth of penetration is limited by the stop on the Insertion Driver. With the implant itself now in a position to act as a distractor, the Long Distractor is then removed from the contralateral side and the procedure repeated. When both implants are firmly in place, the outer sleeve may then be removed. The amount of countersinking of the implants may then be adjusted under direct vision.
- the disc (D) between adjacent vertebrae (V) is approached via bilateral paired semihemilaminotomies of the adjacent vertebrae.
- the supraspinous ligament, the interspinous ligament, the spinous process, portions of the lamina, and most of the facet joints are preserved.
- these structures may be removed.
- a bilateral partial nuclear discectomy is then performed through bilateral openings created through the posterior aspect of the annulus fibrosus. While considered less desirable, disc excision can be delayed and performed simultaneously with the vertebral bone resection during the drilling procedure.
- a dural nerve root retractor is placed such that the dural sac and lower nerve root are retracted medially allowing exposure to one side of a portion of two adjacent vertebral bodies and the interposed disc posteriorly.
- a Long Distractor 100 is inserted under direct vision into the intervertebral space.
- the disc penetrating portion 102 is essentially cylindrical with a bullet-shaped front end 103 and a shoulder portion 104 where the penetrating portion 102 extends from barrel 106.
- the penetrating portion 102 urges the vertebral bodies apart, facilitating the introduction of the instruments.
- Long Distractors with sequentially increasing diameter penetrating portions 102 are then introduced. As the optimal diameter of penetrating portion 102 is achieved, the vertebral bodies to either side are forced into full congruence and thus become parallel, not only to the penetrating portion 102, but to each other.
- any remaining excrescences of bone of the posterior vertebral bodies adjacent the posterior disc which have not already been removed are flattened flush to the vertebral body by the forced impaction, such as by hitting with a hammer flat surface 109 of crown 110, driving the shoulder 104 against the lipped portions of vertebrae V.
- unit 100 Because of the forced opposition of the vertebral endplates to portion 102 with optimal distraction, unit 100 will then come to lie absolutely perpendicular to the plane of the posterior bodies and absolutely parallel to the vertebral endplates, allowing optimal alignment for the procedure to be performed.
- Penetrating portion 102 is available in various diameters, but all are of a constant length, which is less than the known depth of the interspace. This combined with the circumferential shoulder 104, which is too large to fit within the interspace, protects against the danger of overpenetration. Barrel 106 is of the same diameter as the external diameter of the device to be implanted. A recessed portion 108 below the crown 110 allows for the Long Distractor 100 to be engaged by an extractor unit shown in Figure 9.
- a Convertible Long Distractor 113 is used on the first side of the spine. As shown in Figures 2, the Convertible Long Distractor 113 has a barrel portion 152 separable from the Short Distractor portion 120. While the initial distraction may be performed with a solid Long Distractor, as the optimal distraction is approached the appropriate Convertible Long Distractor is utilized.
- the Convertible Long Distractor 113 consists of a Short Distractor portion 120 and a barrel 152 having a rectangular projection 134 at one end.
- the Short Distractor 120 has an increased diameter head 128, a rectangular slot 118 and an internal threaded opening 114.
- the barrel 152 is hollow and has an internal shaft 111 terminating in a large diameter hexagonal crown 115 at one end and a reduced diameter portion 112.
- the crown has a detent portion 117 in its flat surface.
- the other end of the shaft 111 has a threaded small member 116 that corresponds to threaded opening 114.
- the shaft 111 is prevented from removal from the barrel 152 by set pin 119 passing through the wall of barrel 152 in a convenient manner.
- the Short Distractor portion 120 is removably attached to the barrel portion 152 via the mating of female rectangular slot 118 and the male mating member 134. The mating held together by utilizing knob 136 to drive the crown 110 connected to interior shaft 111 having a threaded working end screw 116 that threads into the female aperture 118 of the Short Distractor portion 120.
- Cap 136 has an open socket 138 for fitting around crown 115 and engages the reduced diameter hexagonal portion 112 so as to permit the rotation of shaft 111 and threaded male member 116.
- a detent ball 150 in the inside of the socket 138 engages detent 117 in the crown 115, holding them together.
- the Short Distractor portion 120 of Figures 2, 3, and 3A-3F are designed to provide for high stability when temporarily situated so as to resist inadvertent migration while the surgeon is working on the second side.
- the embodiment of the Short Distractor 120 shown in Figures 3 and 3A has a pair of sharp pegs 126, to embed into the opposing vertebral bodies and forward facing ratchetings 124, that further resist backward movement.
- Figures 3B and 3C which show the preferred embodiment, are side and top views of an alternative embodiment of the distractor portion such that the distractor portion to be interposed between the vertebrae is essentially cylindrical, but with circumferential forward facing ratchetings 124.
- Figures 3D and 3E A further alternative embodiment is shown in Figures 3D and 3E.
- This is a more rectangularized design, with forward facing ratchetings, without the sharp prongs 126 of Figure 3.
- Figure 3F is a side view of a further embodiment of the Short Distractor 120 shown with knurling, to increase the interference with the bone surface so as to add stability to the unit and to resist dislodgment.
- the working ends of both the Long and Short Distractors can have a variety of configurations consistent with their purpose, and that surface irregularities as well as the shape of the ends themselves, with or without prongs 126, may be utilized to make the Short Distractor 120 more resistant to migration.
- the Convertible Distractor is dissociated, leaving Short Distractor 120 in place with its rounded external end 128, safely on the canal floor and deep to the dural sac and nerve root.
- the surgeon then moves to the other side of the spine at the same disc (D) level, and retracts the dural sac and nerve root medially, exposing the disc on that side.
- Long Distractors 100 are then sequentially inserted into the disc space until the diameter of the distractor on the second side is at least as big as that on the first side. If because of some asymmetry of the interspace a larger diameter distractor is required on the second side to achieve the ideal distraction as compared to the first side, then the second side is fitted with a Short Distractor of the larger diameter, and the surgeon would then return back to the first side. In that event, the first side Short Distractor would then be removed and the Long Distractor 100 corresponding to the increased diameter of the already placed Short Distractor 120 would then be inserted.
- the Long Distractor now serves as both a centering post and an alignment rod for the hollow Outer Sleeve 140 shown in Figure 5 which is fitted over the Long Distractor 100, shown by phantom lines 101 in Figure 5.
- the Outer Sleeve 140 is metal and has a sharp toothed front end 142 that is capable of penetrating into and holding fast the two adjacent vertebrae (V) . Interrupting the circumferential sharp teeth of 142 are flat, planar areas 152 which serve to resist the further insertion of the sharp teeth into the vertebral bodies.
- the toothed front end 142 of the Outer Sleeve 140 is a continuation of the tubular shaft 144, which in turn is connected to circumferentially enlarged tubular back end 146 having a knurled outer surface 148 for easier manipulation.
- An alternative embodiment of an Outer Sleeve incorporates an expansile key hole and slot configuration 154 to either side of shaft 144 along the mid-plane of the interspace and parallel to it such that the end 142 resists the collapse of the vertebrae (V) to either side of the disc (D) , but may nevertheless allow for their further distraction, in the event the only diameter or the root diameter of the implant is larger than the hole drilled.
- a Driver Cap 160 in the form of an impaction cap has at its far end a flat, closed-back surface 162 and at its other end a broad, circular opening.
- the Driver Cap 160 fits over both the Outer Sleeve 140 and the Long Distractor 100.
- interior surface 170 circumferentially engages portion 146 of the Outer Sleeve until the back end 172 engages the internal shoulder 164.
- mallet blows are applied to surface 162, that force is transmitted via the internal shoulder 164 to the Outer Sleeve 140 via its far end 172, seating teeth 142 into the vertebral bodies adjacent the disc space D and to the depth of the teeth 142 to the flat portions 152.
- the Distractor Puller 200 of Figure 9 utilized to remove the Long Distractor 100 from the spine leaving the Outer Sleeve 140 in place.
- the Distractor Puller 200 has front portion 202, a mid portion 204, and a back handle portion 206.
- a socket 208 is connected to one end of shaft 210 which at its far end is connected to back handle portion 206.
- the socket 208 has defined within it a cavity 212 that is open at its front end and funnelized on the interior aspect of its sides.
- the cavity 212 is constructed so that the head of the Distractor Puller 200 and the partially circumferential flange 218 engages the circumferential recess 108 of the Distractor 100.
- the entrance to cavity 212 is slightly funnelized, and the leading edges of flange 218 slightly rounded to facilitate the engagement of recess 108 and head 110 of Distractor 100, which is further facilitated in that the Driver Cap 160 leaves portion 108 of Distractor 100 precisely flush with the back surface 172 of the Outer Sleeve 140.
- This provides a large, flat surface 172 to precisely guide surface 230 of socket 208, and open portion 212 around head 110 while flange 218 engages recess 108.
- the springloaded detent ball 228 engages hemispherical depression 112 in the crown 110, shown in Figure 2.
- This springloaded detent 228 in engagement with complimentary indent 218 protects against the inadvertent dissociation of the Long Distractor from the Puller 200 after the Distractor has been removed from within the Outer Sleeve 140 and prior to its removal from the wound.
- the two instruments are easily disassociated by freeing the crown portion 110 from cavity 212 by a manual force applied perpendicular to their relative long axes at this location.
- a cylindrical and free removable weight 216 is fitted around shaft 210 between the front portion 202 and the rear handle portion 206. Gently, but repeatedly sliding the weight 216 along shaft 210 and driven rearwardly against flat surface 228, transmits a rearward vector to proximal end 202 and thereby to the Long Distractor 100 to which it is engaged.
- Paired extended handle 224 and 226, allow the surgeon to resist any excessive rearward motion as the instrument is used to liberate the Long Distractor 100.
- Paired handles 224 and 226 are also useful in that they allow a rotational directing of portion 208, via the shaft 210. This allows the surgeon to control and manipulate rotationally the orientation of the opening of cavity 212 to facilitate its application, to the head 110 of the distractor 100.
- the Distractor Puller 200 is a significant improvement over the alternatives of striking a remover instrument with an independent hammer over the exposed surgical wound, or manually extracting the distractor by forcefully pulling.
- the use of a free hammer over the open wound is dangerous because the neural structures can be impacted on the back swing which is made even more likely by the effects of gravity on the mallet head.
- Manual extraction by pulling is dangerous because of the significant interference fit of portion 102 within the spine such that significant force would be required to remove the Distractor 100, and if force were not coaxial then the Outer Sleeve might be dislodged or misaligned. Further, once the flat portion 102 became free of the interspace, all resistance to withdrawal would be lost and in the face of the considerable force necessary to free it, the Distractor 100 might easily become projectile imparting injury to the patient and/or the surgeon.
- the toothed end 142 of the Outer Sleeve 140 working in conjunction with the Short Distractor 120 on the contralateral side rigidly maintains the relative position of the adjacent vertebrae V. Further, since the remainder of the procedure on that side of the spine occurs entirely through the protective Outer Sleeve 140, and as the nerves and dural sac are external to that Outer Sleeve and superficial to the toothed end 142 of the Outer Sleeve 140, which is firmly embedded into the adjacent vertebrae V, the Outer Sleeve 140 serves to insure the safety of these delicate neural structures.
- the Outer Sleeve 140 is of a fixed length and rigid, its flat rearward surface 172 may be used as a stop to the advancement of all instruments placed through the Outer Sleeve 140, thus protecting against accidental overpenetration. Further, the Outer Sleeve 140 assures that the further procedure to be performed will occur coaxial to the disc space D and further, be symmetrical in regard to each of the opposed vertebral surfaces.
- Figure 10B is a posterior view of the spine at this stage of the procedure, showing a Short Distractor 120 in place on one side of the spine and the bottom portion of Outer Sleeve 140 in place on the opposite side of the spine.
- an Inner Sleeve 242 is inserted from the rear within the Outer Sleeve 140.
- This Inner Sleeve has a collar portion 244 of a known thickness which seats against the top edge surface 172 of Outer Sleeve 140.
- the cylindrical barrel portion of Inner Sleeve 242 comes to approximate the posterior aspect of the vertebral bodies interior the Outer Sleeve when fully seated.
- a Drill 240, having a known selected length is then introduced through the rearward aperture of the Inner Sleeve 242 and utilized to ream out the arcs of bone which it engages from the opposed vertebral endplates as well as any discal material within its path down to its predetermined and limited depth.
- the Drill 240 has a narrow engagement portion 246, which allows it to be affixed to a drill mechanism which may be either a manual or a power unit.
- a circumferential collar 248 of an increased diameter serves to limit the depth of penetration of the drill 240 and may be fixed, or lockably adjustable.
- Drill 240 is a modification of a large fluted drill design such that the end resembles an end cutting mill which may contain any workable number of cutting surfaces, but preferably four or more, and such cutting surfaces being relatively shallow such that the advancement of the instrument occurs more slowly.
- the outside diameter of the Drill 240 corresponds to the minor diameter of the threaded spinal implant.
- the Inner Sleeve 242 has an inner diameter slightly greater than that dimension and its outer diameter is slightly smaller than the inside diameter of the Outer Sleeve 140 which has the same outer diameter as the major diameter of the threaded implant.
- the drill shaft of drill 240 comprises an upper portion 243, a central recessed portion 256 of a smaller diameter and a lower cutting drill portion 250.
- the upper portion 243 and lower portion 256 of the drill 240 have the same outside diameter.
- the Inner Sleeve 242 serves many functions.
- Outer Sleeve 140 to have an internal diameter large enough to admit the threaded spinal implant, which is indeed considerably larger in diameter than the Drill 240 itself.
- the Drill 240 would be free to wander within the confines of that greater space and would not reliably make parallel cuts removing equal portions of bone from the adjacent vertebrae V. Further, the bone removal not only needs to be equal, but must be correctly oriented in three dimensions. That is, the path of the
- Drill 240 must be equally centered within the disc space, parallel the endplates, and parallel to the sagittal axis dissecting the interspace.
- a further purpose of the Inner Sleeve 242 is that it may be removed simultaneously with the Drill 240, thereby trapping the debris, both cartilaginous and bony generated during the drilling procedure, which are guided rearward by the large flutes 251 of Drill portion 250, where they are collected around recessed portion 256 between the recessed portion 256 and the inner wall of the Inner Sleeve 242 are there contained therein.
- the Drill 240 in conjunction with the Inner Sleeve 242, all of the debris generated by the reaming procedure is safely removed from the spinal canal and wound area.
- Drill end 250 has a forward projecting nipple 260, which itself is bullet-shaped in its leading aspect so as to ease its entrance into the disc space and to urge the vertebrae apart.
- Nipple 260 is distracting, stabilizing as it resists any tendency of the vertebrae to move together, is self-centering to the Drill portion 250 when working in conjunction with Sleeves 140 and 242, and virtually assures the symmetrical resection of bone from the opposed vertebral surfaces.
- FIG. 11B The alternative "Trephine Method" referred to earlier in this application, is shown in Figure 11B.
- a Long Distractor 100 is left in place after the Outer Sleeve 140 is seated.
- the Long Distractor 100 in this case differs from the Long Distractor of the preferred embodiment in that its outside diameter of the barrel 106 is of a smaller diameter than in the prior version. This is made necessary because regardless of the method, the hole to be formed corresponds to the minor diameter of the spinal implant.
- Trephine 270 a hollow, tubular member with sharp cutting teeth 251 at its proximal end, has a wall thickness and since the outside diameter of that trephine 270 must correspond to the root diameter of the implant, then the wall thickness of the trephine 270 must be allowed for by a corresponding reduction in the diameter of the Long Distractor 100.
- a further modification of the Long Distractor 100 to the "Trephine Method” would use longitudinal grooves (not shown) along the barrel surface 106 for the purpose of transmitting any debris generated during the cutting procedure, rearward. Since the cutting element is both centered and aligned by the Long Distractor, the use of the Inner Sleeve 242 is not mandatory, but may once again be useful in controlling the path of the debris. To that end, little debris is generated in the "Trephine Method" as the bony arcs are not so much being reamed out and removed as they are simply being cut into the bone where these arcs of bone are left connected at their far ends.
- the instrument 272 is inserted through Outer Sleeve 140 where the lower surface 273 of handle 274 abuts the top 172 of the Outer Sleeve 140, both stopping downward motion of instrument 272 and precisely placing the perpendicularly cutting arm 278 of instrument 272 so that as handle portion 274 is rotated, the cutting arm 278 is also rotated, cutting the arcs of bone and liberating them from their last attachments. These portions of bone are then removed utilizing this instrument or a long forceps, and then placed within the implants or otherwise used to participate in the fusion.
- the spinal implant I is essentially self-tapping, if the bone is unusually hard it may be desirable to form the thread pattern within the interspace prior to the insertion of the implant I.
- Tap 280 has a threadcutting portion 282 connected by a shaft 286 to a handle portion 292, which has been designed to give mechanical advantage to the rotation of the instrument for the purpose of cutting threads.
- the lower portion of handle 290 has a forward facing flat surface 288 too large to fit through the opening of Outer Sleeve 140 which thus safely limits the depth of penetration of the cutting element 282.
- This tap 280 is further made safe by blunt end 294 which will engage the uncut portions of the vertebral bone just prior to the engagement of shoulder 288 against surface 172.
- This feature allows the surgeon to appreciate a less harsh resistance as the blunt nose 294 encounters the remaining unresected bone for the drill hole and prior to the sudden increase in resistance caused by the seating of shoulder 288 against top edge 172, which first resistance serves as a warning to the surgeon to discontinue the tapping procedure.
- the surgeon has both visual (as shoulder 288 approaches top edge 172) and tactile warnings to avoid stripping the thread form.
- Tap end 282 is highly specialized for its specific purpose.
- a truncated bullet-shaped area 298 which ramps up to the constant diameter intermediate the cutting ridges 296. Ramp portion 298 urges the opposed vertebral bodies apart, which motion is resisted by Outer Sleeve 140, thus progressively driving the sharp leading edges of thread forms 296 into the vertebral bodies.
- the periodic longitudinal grooves 284 interrupting the thread forms which may number 1 to 8, but preferably 4, function to accumulate the bony material which is removed during the thread cutting process. In that regard, in the ideal embodiment, the thread cutting form is designed to compress the bone to be formed rather than to trough through it.
- the minor diameter corresponds to the minor diameter of the implant I, but the major diameter is slightly less than the major diameter of the implant.
- Figure 14a shows a trephine 300 with an exceedingly sharp front cutting edge 302 for quickly and cleanly coring into the patient's posterior iliac crest, or any other bony tissue, and for the purpose of producing a core of bone then contained within the hollow 304 of the trephine 300.
- Trephine 300 has a rear portion 306 with a pair of diametrically opposed slots 310, and disposed clockwise from their longitudinally oriented rearward facing openings so as to engage diametrically and opposing members 312 of Drive unit 308, by which trephine 300 may be attached to either a hand or power drill. It can be appreciated that engagement mechanism 312 is stable during the clockwise cutting procedure, and yet allows for the rapid disconnection of the two components once the cutting is completed.
- a corkscrew 408 shown in Figure 14C is introduced though the central opening of rear portion 306 and threaded down and through the core of bone within 304 and to the depth of teeth 302.
- Trephine 300 has a barrel portion 304 continuous with sharp toothed portion 302 having an inner diameter just less than the inner diameter of the spinal implant I to be loaded.
- the Trephine 300 with its core of harvested bone is then placed as shown in Figure 14B, through opening 340 of Implant Bone Loading device 320, where the barrel portion 304 then passes through and is stopped by circular flange 344.
- the plunger shaft 326 of instrument 320 is then prepared for attachment by rotating knob 332 counterclockwise such that the plunger 372 is pulled via the long threaded shaft portion 328 back to the base of collar 330 at its proximal end. In this position, knob 332 is considerably extended rearward from collar 330. With plunger shaft 326 in this position, the plunger head 372 is inserted into the central hollow of portion 306 of Trephine 300 as the proximal cylindrical portion of collar 330 then follows it, such that the plunger 372 then occupies the rearward portion of barrel 304 and the proximal cylindrical portion of collar 330 occupies the central hollow of portion 306. A pair of diametrically opposed radially projecting arms 346 on collar 330 are then advanced longitudinally into diametrically opposed paired L slots 340 and then rotated clockwise to complete this assembly.
- a spinal implant I is engaged through its female rectangular slot 364 by a rectangular protruding bar extending from rearward facing surface of end plug 324, (not shown) and secured there by knob 334 which extends as a rod through a central aperture within end plug 324 to extend at the far end as.a small bolt which threads to a female aperture centered within the female slot 364 of the spinal implant.
- end 302 of trephine 300 lies coaxial and opposed to the open end of implant I.
- knob 332 is then rotated clockwise, the plunger 372 proximal the threaded shaft 328 is then forcibly, but controllably driven forward down the barrel 304 ejecting the bone graft directly into the spinal implant I.
- the bone graft is greater in length than the interior of the spinal implant, with further compression the bone is forced into the radially disposed apertures through the wall of the device communicating from the central cavity to the exterior.
- End plug 324 is then removed from apparatus 320. Using end plug 324 as a handle, end cap 374 shown in Figure 16 is secured to the open end of the spinal implant I. The implant is then disassociated from end plug 324 by rotating knob 334 counterclockwise.
- FIG 16 shows an Implant Driver instrument which may be used to either insert or to remove said implant I.
- Driver 350 has at its far end 362, a rectangular protrusion 398, which protrusion intimately engages the complimentary rectangular slot 364 of implant I.
- Protruding from slot 398 of end 362 is threaded portion 353, which extends as a rod through hollow shaft 358 and hollow hand barrel 360 to knob 354 where it can be rotationally controlled.
- Threaded portion 353 screws into a female aperture central slot 364, urging 353 into 364, and binding them together such that instrument 350 can be rotated via paired and diametrically opposed extending arms 366 and in either direction while maintaining contact with the implant.
- the implant is then introduced through the Outer Sleeve 140 and screwed into the interspace opposed between the two prepared vertebrae V until such time as the leading edge of the Implant Cap 374 reaches the depth of the prepared hole at which time its forward motion is impeded by the bone lying before it which had not been drilled out. This allows for a progressive feel to the surgeon as the implant is screwed home.
- this terminal resistance to further seating provides significant tactile feedback to the surgeon.
- visual monitoring of the depth of insertion of the implant is provided to the surgeon by observing the progressive approximation of the forward surface 370, of barrel portion 360, as it approaches the rearward facing surface 172 of Outer Sleeve 140. Nevertheless, a final safety mechanism, when the full depth of insertion has been achieved, surface 370 of instrument 350 will abut surface 172 of the Outer Sleeve 140, prohibiting any further installation of the spinal implant.
- the Driver 350 is dissociated from the implant by turning knob 354 in a counterclockwise direction.
- the Driver 350 is then withdrawn from the outer sheath, then the Outer Sleeve 140 is removed. This leaves the implant fully installed and inset to the determined depth as shown in Figure 18.
- a dural nerve root retractor is used to retract the neural structures medially, bringing into full view the head 128 of the Short Distractor 120, lying flush on the canal floor.
- extended screw portion 116 is inserted into the female threaded portion 114 of the Short Distractor 120 as the extended rectangular portion 134 of apparatus 152 is engaged to the female rectangular portion 118 of the Short Distractor 120. Then turning rearward facing portions 108 and 110, utilizing the knob 136 of Figure 2, the Long Distractor configuration is restored.
- the Outer Sleeve 140 is slipped over the reconstituted Long Distractor and seated using the Driver Cap 162. The entire sequence of events as described for the implantation of the spinal implant I as already placed, is then repeated such that both spinal implants come to lie side by side within the interspace. Though not necessary, circlage or other internal fixation of the levels to be fused may additionally be performed, and then the wound is closed in the routine manner.
- the interspace to be fused is exposed anteriorly.
- the soft tissues are withdrawn and protected to either side, and if necessary, above and below as well. It is then possible to visualize the entire width of the vertebrae anteriorly adjacent that interspace.
- the surgeon has already templated the appropriate patient radiographs to determine the requisite distraction and optimal implant size.
- the surgeon then broadly excises the great bulk of the nuclear disc portion. (Alternatively, the disc can be left to be removed via the drill later.)
- the surgeon then notes and marks a point midway from side to side anteriorly. He then inserts Long Distractor 100 centering it on a point midway between the point just noted and the lateral extent of the intervertebral space visualized anteriorly.
- the outer barrel portion 106 of the Distractor 100 utilized will correspond to the outside diameter of the implants to be installed.
- the Distractor tips 102 inserted are sequentially larger in diameter until the optimal distraction is achieved.
- This optimal distraction although suggested by the initial templating, may be visually and tactilely confirmed as performed.
- the vertebral endplates will come into full congruence and parallel to the forward shaft portion 102 of the Distractor 100, causing an alteration in the alignment of the vertebrae and a significant increase in the interference fit and pressurization at the tip, such that the instrument becomes exceedingly stable.
- a Dual Outer Sleeve 340 consisting of a pair of hollow tubes is then introduced over the side by side Long Distractors protruding anteriorly from the spine.
- the Dual Outer Sleeve 340 is comprised of two hollow tubular members identical in size displaced from each other ideally the sum of the difference between the minor and major diameters of both implants combined, but not less than that difference for one implant, as it is possible to have the threads of one implant nest interposed to the threads of the other, such that they both occupy a common area between them.
- the preferred embodiment is slightly greater than two times the difference between the major and minor diameters of the implant (the sum of both) the distance may be considerably greater.
- tubular portions 348 of instrument 340 are parallel, when the area between them 350, is sufficiently great, these elements may be inclined or declined relative to each other such that they either converge or diverge at their proximal ends.
- Paired tubular structures 348 may be bridged in part or wholly throughout their length, but are rigidly fixed by Foot Plate 344.
- a top view shows the Foot Plate to be essentially rectangular, but without sharp corners.
- Foot Plate 344 is contoured so as to approximate the shape of the vertebrae anteriorly. Extending forward from Foot Plate 344 are multiple sharp prongs 342 sufficiently long to affix them to the vertebrae. The prongs 342 are limited in length so as to not penetrate too far posteriorly and number from 2 to 10, but preferably 6. As the Dual Outer Sleeve 340 is driven forward utilizing Dual Driver Cap 420, of Figure 7E, engaging the rearward end 352, the prongs 342 extending from Foot Plate 344 are embedded into the opposed vertebral bodies until their forward motion is inhibited by the curved Foot Plate 344 becoming congruent to and being stopped by, the anterior aspect of the vertebral bodies. As already taught in Figure 5, the Dual Driver
- Cap 420 is of the same design as Single Driver Cap 160, in that there is a recess 354 as per 168, allowing the Outer Sleeve to be fully seated without impeding the rearward projection of the Long Distractor unit. However, unlike in Cap 160, area 354 is more relieved as it is unnecessary for the Dual Cap 420 to contact the Long Distractor through portion 110 to inhibit its forward motion, as the Foot Plate 344 functions to that effect. Further, the Dual Cap 420 for the Dual Outer Sleeve 340 is correspondingly dual itself and engages the rearward facing dual tubular portion 352. Once the Dual Outer Sleeve has been fully seated, the vertebrae adjacent the interspace to be fused are rigidly held via Foot Plate 344 and the prongs 342.
- the cylindrical implant I comprises a hollow tubular member which in the preferred embodiment is made of an ASTM surgically implantable material, preferably Titanium.
- the cylindrical implant I is closed at one end and open at the other end covered by a cap 394.
- the cylindrical implant I has a series of macro-sized openings 390 through the side walls of the cylindrical implant I.
- a series of external threads 392 are formed on the circumference of the cylindrical implant I. Any variety of threads may be used on the implant.
- the cap 374 has a hexagonal opening 394 for tightening the cap 374.
- While the present invention has been described in association with the implant of a threaded spinal implant, it is recognized that other forms of implants may be used with the present method.
- implants made from bone or artificial materials, knurled or irregularly shaped cylinders or spheres, or any other shaped implants that can be introduced through the outer sleeve may be used. Being able to perform the procedure through the outer sleeve permits the procedure to be performed safely and quickly, and more accurately.
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019950705673A KR100318703B1 (en) | 1993-06-10 | 1994-06-09 | Spinal column distributor inserting spinal implant |
AT94920704T ATE247928T1 (en) | 1993-06-10 | 1994-06-09 | DEVICE FOR INSERTING BACK VERTEBRATE IMPLANTS |
CA002164859A CA2164859C (en) | 1993-06-10 | 1994-06-09 | Apparatus and method of inserting spinal implants |
EP94920704A EP0703757B1 (en) | 1988-06-13 | 1994-06-09 | Apparatus for inserting spinal implants |
DE69433088T DE69433088T2 (en) | 1993-06-10 | 1994-06-09 | DEVICE FOR INSERTING SPINE IMPLANTS |
DK00204831T DK1093760T3 (en) | 1993-06-10 | 1994-06-09 | Spinal implant insertion device |
DK94920704T DK0703757T3 (en) | 1993-06-10 | 1994-06-09 | Spinal implant insertion device |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
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US07/205,935 US5015247A (en) | 1988-06-13 | 1988-06-13 | Threaded spinal implant |
US69867491A | 1991-05-10 | 1991-05-10 | |
US08/074,781 | 1993-06-10 | ||
US08/074,781 US5484437A (en) | 1988-06-13 | 1993-06-10 | Apparatus and method of inserting spinal implants |
US08/396,414 US6080155A (en) | 1988-06-13 | 1995-02-27 | Method of inserting and preloading spinal implants |
Publications (2)
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WO1994028824A2 true WO1994028824A2 (en) | 1994-12-22 |
WO1994028824A3 WO1994028824A3 (en) | 1995-03-16 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/US1994/006345 WO1994028824A2 (en) | 1988-06-13 | 1994-06-09 | Apparatus and method of inserting spinal implants |
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US (3) | US5484437A (en) |
JP (1) | JPH078514A (en) |
WO (1) | WO1994028824A2 (en) |
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Also Published As
Publication number | Publication date |
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US5505732A (en) | 1996-04-09 |
US5484437A (en) | 1996-01-16 |
US6096038A (en) | 2000-08-01 |
WO1994028824A3 (en) | 1995-03-16 |
JPH078514A (en) | 1995-01-13 |
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