US20100131020A1 - Vertebral implant inserter and method of use - Google Patents
Vertebral implant inserter and method of use Download PDFInfo
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- US20100131020A1 US20100131020A1 US12/695,424 US69542410A US2010131020A1 US 20100131020 A1 US20100131020 A1 US 20100131020A1 US 69542410 A US69542410 A US 69542410A US 2010131020 A1 US2010131020 A1 US 2010131020A1
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- Prior art keywords
- vertebral implant
- retainer
- moving
- engagement element
- width
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7074—Tools specially adapted for spinal fixation operations other than for bone removal or filler handling
- A61B17/7076—Tools specially adapted for spinal fixation operations other than for bone removal or filler handling for driving, positioning or assembling spinal clamps or bone anchors specially adapted for spinal fixation
Definitions
- Vertebral implants such as spinal hooks are sometimes used in spinal implant systems for the treatment of spinal deformities and fractures. Conditions for which spinal implants may be indicated include degenerative disc disease, vertebral fractures, scoliosis, or other conditions that cause instability of the spine.
- spinal implant comprises hooks and/or pedicle screws attached to rods on one or each lateral side of the vertebrae. As surgical techniques advance, minimally intrusive procedures requiring smaller incisions are more commonly used to attach spinal implants such as these. As such, the surgical insertion tools that are used to hold and insert the implant components are a part of this improving trend.
- Embodiments of a surgical installation tool are disclosed.
- the installation tool may be used to insert a vertebral implant into a patient.
- the vertebral implant may be attached to one end of the installation tool.
- the attachment end of the installation tool may include an engagement member that is movable between engaged and released positions.
- the engagement member may be outwardly biased so that it naturally rests in the released position.
- the engagement member may be inwardly movable from the released position to the engaged position.
- a reactive force caused by the inward deflection may supply the attachment force between the installation tool and the vertebral implant.
- the attachment between the vertebral implant to the installation tool may be maintained while the engagement member is in the engaged position.
- FIG. 1 is a perspective view of an insertion tool holding an implant device according to one embodiment
- FIG. 2 is an exploded assembly view of an insertion tool and an implant device according to one embodiment
- FIGS. 3A-3B are side views of an insertion tool holding an implant device according to one embodiment
- FIG. 4 is a frontal view of a retainer of an insertion tool according to one embodiment
- FIG. 5 is a top view of a retainer of an insertion tool according to one embodiment
- FIG. 6 is an exploded assembly view of an insertion tool according to one embodiment
- FIG. 7 is a perspective view of an insertion tool according to one embodiment
- FIG. 8 is a top view of a retainer of an insertion tool according to one embodiment
- FIG. 9 is a top view of a retainer of an insertion tool and an attached implant device according to one embodiment
- FIG. 10 is a top view of a retainer of an insertion tool according to one embodiment
- FIG. 11 is a top view of a retainer of an insertion tool and an attached implant device according to one embodiment
- FIG. 12 is a top view of a retainer of an insertion tool according to one embodiment.
- FIG. 13 is a top view of a retainer of an insertion tool and an attached implant device according to one embodiment.
- FIG. 1 An exemplary embodiment of the insertion tool 10 is illustrated in FIG. 1 .
- the insertion tool 10 is illustrated holding a hook implant 50 .
- the hook 50 may be a conventional distraction hook or other hook implant such as that belonging to the CD HORIZON® LEGACYTM Spinal System available from Medtronic Sofamor Danek in Memphis, Tenn.
- Various types of hooks may be held and positioned using the insertion tool 10 , including for example pedicle hooks, supralaminar hooks, infralaminar hooks, and transverse process hooks.
- FIG. 1 the hook 50 is held by the exemplary insertion tool 10 .
- FIG. 2 shows the hook 50 separated from the insertion tool 10 .
- the insertion tool 10 includes an elongated bar 12 having a head or retainer 20 disposed at an end of the elongated bar 12 .
- the insertion tool 10 may be manipulated during surgery by maneuvering the elongated bar 12 to place the hook 50 in a desired position relative to a vertebral member (not shown).
- the retainer 20 is configured to hold the hook 50 in a releasable manner.
- the insertion tool 10 may be extracted, leaving the hook 50 substantially in the desired position.
- the retainer 20 is shaped to fill much of the saddle portion 52 of the hook 50 .
- the saddle portion 52 comprises spaced apart side walls 54 having a substantially U-shaped open channel therebetween. It is between these side walls 54 that a spinal rod 60 of a spinal implant system is inserted.
- the side walls 54 include a threaded central portion 56 into which a retaining member 70 is inserted to secure the rod 60 within the saddle portion 52 of the hook 50 .
- the biasing force applied by the biasing members 22 against the inner side walls 58 of the hook 50 is sufficient to support the weight of the hook 50 .
- the retainer 20 and the biasing members 22 hold the hook 50 in a releasable manner.
- the biasing members 22 should not create so large a retaining force that the insertion tool 10 cannot be extracted from the hook 50 as needed.
- the exemplary insertion tool 10 also includes an enlarged flange 14 adjacent to the retainer 20 .
- the flange 14 serves to limit the depth to which the hook 50 may be inserted onto the retainer 20 .
- the flange 14 permits the application of an insertion force in the direction indicated by the letter F in FIG. 1 .
- the arrangement of the retainer 20 and flange 14 allow the insertion tool 10 to be removed in the directions indicated by arrow A or arrow P or some vector combination thereof.
- These arrows F, A, and P are shown relative to an X-Y-Z coordinate system.
- the direction of deflection of the biasing members 22 caused by installation of the hook 50 onto the retainer 20 in one or more embodiments may be substantially aligned with the Y-coordinate.
- FIG. 3A shows arrows A and P relative to the same X-Y-Z coordinate system and to the entire insertion tool 10 and hook 50 .
- the elongated bar 12 is substantially aligned with the direction of removal along arrow P.
- This direction P is towards the open part of the U-shaped channel in the saddle 52 (see FIG. 2 ).
- This direction P is also substantially perpendicular to the rod 60 that lies within the U-shaped channel in saddle 52 .
- the ability to remove the insertion tool in this direction may help preserve the desire to maintain small surgical incisions and may also prevent interference with vertebrae or other anatomy (not shown).
- the retainer 20 uses friction to grasp the inner surfaces 58 of side walls 54 of the hook 50 . Consequently, there is some amount of flexibility in orienting the hook 50 onto the retainer 20 . That is, as FIG. 3B shows, the hook 50 may be rotated slightly up and down in the X-Z plane as indicated by the arrows H relative to the insertion tool 10 . This additional degree of flexibility may further improve approach angles during surgical installation as well as in removing the insertion tool 10 from the hook 50 .
- the U-shaped configuration of the retainer 20 is more clearly visible in the frontal view shown in FIG. 4 .
- This particular view is aligned with a longitudinal axis labeled D.
- the bottom surface 24 is curved to fit within the saddle 52 of hook 50 .
- the bottom surface 24 of retainer 20 has a radius of curvature that matches that of the bottom of saddle 52 (see FIG. 2 ). This same radius of curvature may also correspond to a diameter of rod 60 (also shown in FIG. 2 ).
- FIG. 4 also illustrates a small outward bow of the biasing members 22 relative to the width of the bottom surface 24 .
- the biasing members 22 are resilient and deflect inward, conforming to the size of the saddle 52 of hook 50 (as shown in FIG. 1 ). The reaction force caused by this inward deflection supplies the friction that holds the hook 50 onto the retainer 20 .
- FIG. 5 shows a top view of the exemplary retainer 20 , including the biasing members 22 , in relation to the flange 14 and elongated bar 12 .
- the middle portion 26 between the biasing members 22 extends wider than the biasing members 22 (also visible in FIG. 3 ).
- these middle portions 26 fit within the threaded portion 56 of the hook 50 .
- a close fit between the middle portions 26 of retainer 20 and the threaded portions 56 of hook 50 may contribute to a more robust retention, reducing unwanted motion between the two parts 10 , 50 .
- a widened middle portion 26 may omitted in cases where the hook 50 or other vertebral implant does not have the threaded portions 56 .
- FIG. 5 also shows that the retainer 20 is oriented along the longitudinal axis labeled D.
- the biasing members 22 are positioned in a free state and are spaced apart a first width W 1 in a direction substantially perpendicular to the longitudinal axis D.
- the biasing members 22 deflect inward towards an engaged state where the biasing members are space apart a second width illustrated by the dimension labeled W 2 .
- This inward deflection of the biasing members 22 creates the outward retention force that keeps the hook 50 attached to the retainer 20 .
- the length of the retainer in the left to right direction of FIG. 5 remains substantially constant.
- FIGS. 6-9 An alternative embodiment of a retainer 120 is illustrated in FIGS. 6-9 .
- FIG. 6 shows an exploded view of components in this particular embodiment.
- the retainer 120 uses a biasing member 122 to apply a retaining force to a hook 50 .
- the biasing member 122 is a compression ring.
- the biasing member 122 fits within a recess 126 formed between retaining walls 128 of a substantially U-shaped retainer body 124 protruding from flange 114 .
- this retainer body 124 is sized to fit within the saddle 52 of the hook 50 shown in FIG. 2 .
- the biasing member 123 is captured within the recess 126 by a substantially cylindrical plug 130 .
- the plug 130 includes three portions 132 , 134 , 136 defined by different diameters.
- a flange portion 132 has a diameter that is larger than the inner diameter of the biasing member 122 .
- the body portion 134 has a diameter that is smaller than the inner diameter of the biasing member 122 .
- a plug portion 136 has a diameter that is sized to fit within a corresponding aperture 138 in the retainer body 124 .
- the plug portion 136 may be threaded to fit within a corresponding threaded aperture 138 .
- the plug portion 136 may be press fitted into the aperture 138 .
- the plug portion 136 may be loosely fit into aperture 138 , but retained using an adhesive compound. As configured, the plug 130 may retain the biasing member 122 as shown in FIG. 7 .
- the biasing member 122 further comprises a gap 123 that is larger than a corresponding orienting feature 133 in the body portion 134 of the plug 130 .
- FIG. 8 shows a top view of the exemplary retainer 120 .
- the gap 123 in biasing member 122 is aligned with the orienting feature 133 .
- the gap 123 is wider than the orienting feature 133 as evidenced by the existence of gaps 123 on either side of the orienting feature 133 .
- the body portion 134 (see FIG. 6 ) has a diameter that is smaller than the biasing member 122 . This difference in size allows resilient compression of the biasing member 122 in the direction indicated by the arrows labeled C in FIG. 8 , which is substantially perpendicular to the longitudinal axis D.
- FIG. 8 also shows that the biasing member 122 is marginally wider than the retaining walls 128 of the retainer body 124 .
- FIG. 9 illustrates that this configuration mates with a corresponding configuration in a hook 50 .
- the biasing member 122 in the present embodiment engages the threaded portion 56 of the sidewalls 54 of hook 50 .
- FIG. 9 also shows that upon inserting the retainer 120 into the hook 50 , the biasing member 122 compresses slightly, creating a reaction force that frictionally engages the hook 50 .
- the compression of the biasing member 122 is visible in the vicinity of the orienting feature 133 , where the amount of gap 123 on either side of the orienting feature 133 is reduced as compared to FIG. 8 .
- a biasing member 222 is used to apply a frictional retaining force when compressed in the direction of arrows C.
- a single biasing member 222 is illustrated though a plurality may be used.
- the biasing member 222 in this embodiment does not directly contact a hook 50 of the type shown in the various Figures. Instead, the biasing member 222 imparts a reactive force on complementary plungers 226 disposed within a head 224 and that are configured to fit within the threaded portion 56 of the sidewalls 54 of hook 50 .
- FIG. 11 shows this same embodiment with the hook 50 attached to the retainer 220 and the plungers 226 compressed as compared to the position shown in FIG. 10 .
- the retention mechanism created by biasing members 122 and 222 provides some flexibility in attaching a hook 50 . That is, the adjustability represented by the arrows labeled H in FIG. 3B is equally applicable to these embodiments of the retainer 120 , 220 . Accordingly, the hook 50 may be rotated slightly up and down in the X-Z plane as indicated by the arrows H relative to the insertion tool 10 . This additional degree of flexibility may further improve approach angles during surgical installation as well as in removing the insertion tool 10 from the hook 50 .
- a biasing member 222 similar to that shown in FIGS. 10 and 11 is used to apply a frictional retaining force when compressed in the direction of arrow C.
- a single biasing member 222 is illustrated though a plurality may be used.
- the biasing member 222 imparts a reactive force on a single plunger 226 that is disposed within a head 324 and is also configured to fit within the threaded portion 56 of sidewalls 54 of hook 50 .
- FIG. 12 shows this same embodiment with the hook 50 attached to the retainer 320 and the single plunger 226 compressed as compared to the position shown in FIG. 12 .
- a hook 50 has been used as an exemplary implant that may be placed with the insertion tool 10
- other implant devices may be positioned using the insertion tool.
- pedicle screws, clamps for securing a rod to a plate, and other items featuring a rod clamp similar to the illustrated saddle 52 of hook 50 may be inserted and positioned using the insertion tool 10 disclosed herein.
- the present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, and all changes coming within the meaning and equivalency range of the appended claims are intended to be embraced therein.
Abstract
A surgical installation tool to insert a vertebral implant into a patient includes an elongated handle and a head attached to one end. The vertebral implant may be attached to the head. The head may include an engagement member that is movable between engaged and released positions. The engagement member may be outwardly biased so that it naturally rests in the released position. The engagement member may be inwardly movable from the released position to the engaged position. A reactive force caused by the inward deflection may supply the attachment force between the installation tool and the vertebral implant. The attachment between the vertebral implant to the installation tool may be maintained while the engagement member is in the engaged position.
Description
- Vertebral implants such as spinal hooks are sometimes used in spinal implant systems for the treatment of spinal deformities and fractures. Conditions for which spinal implants may be indicated include degenerative disc disease, vertebral fractures, scoliosis, or other conditions that cause instability of the spine. One type of spinal implant comprises hooks and/or pedicle screws attached to rods on one or each lateral side of the vertebrae. As surgical techniques advance, minimally intrusive procedures requiring smaller incisions are more commonly used to attach spinal implants such as these. As such, the surgical insertion tools that are used to hold and insert the implant components are a part of this improving trend.
- Many conventional insertion tools grasp the spinal implant components about the exterior of the component. Further, some conventional insertion tools may not provide an optimal angle of approach for inserting the component, particularly with small surgical incisions. Accordingly, improvements in surgical insertion tools may help advance the trend towards less intrusive surgical procedures.
- Embodiments of a surgical installation tool are disclosed. The installation tool may be used to insert a vertebral implant into a patient. The vertebral implant may be attached to one end of the installation tool. The attachment end of the installation tool may include an engagement member that is movable between engaged and released positions. The engagement member may be outwardly biased so that it naturally rests in the released position. The engagement member may be inwardly movable from the released position to the engaged position. A reactive force caused by the inward deflection may supply the attachment force between the installation tool and the vertebral implant. The attachment between the vertebral implant to the installation tool may be maintained while the engagement member is in the engaged position.
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FIG. 1 is a perspective view of an insertion tool holding an implant device according to one embodiment; -
FIG. 2 is an exploded assembly view of an insertion tool and an implant device according to one embodiment; -
FIGS. 3A-3B are side views of an insertion tool holding an implant device according to one embodiment; -
FIG. 4 is a frontal view of a retainer of an insertion tool according to one embodiment; -
FIG. 5 is a top view of a retainer of an insertion tool according to one embodiment; -
FIG. 6 is an exploded assembly view of an insertion tool according to one embodiment; -
FIG. 7 is a perspective view of an insertion tool according to one embodiment; -
FIG. 8 is a top view of a retainer of an insertion tool according to one embodiment; -
FIG. 9 is a top view of a retainer of an insertion tool and an attached implant device according to one embodiment; -
FIG. 10 is a top view of a retainer of an insertion tool according to one embodiment; -
FIG. 11 is a top view of a retainer of an insertion tool and an attached implant device according to one embodiment; -
FIG. 12 is a top view of a retainer of an insertion tool according to one embodiment; and -
FIG. 13 is a top view of a retainer of an insertion tool and an attached implant device according to one embodiment. - The various embodiments disclosed herein are directed to a low profile surgical implant insertion tool. An exemplary embodiment of the
insertion tool 10 is illustrated inFIG. 1 . In this particular embodiment, theinsertion tool 10 is illustrated holding ahook implant 50. Thehook 50 may be a conventional distraction hook or other hook implant such as that belonging to the CD HORIZON® LEGACY™ Spinal System available from Medtronic Sofamor Danek in Memphis, Tenn. Various types of hooks may be held and positioned using theinsertion tool 10, including for example pedicle hooks, supralaminar hooks, infralaminar hooks, and transverse process hooks. - In
FIG. 1 , thehook 50 is held by theexemplary insertion tool 10. In contrast,FIG. 2 shows thehook 50 separated from theinsertion tool 10. Theinsertion tool 10 includes anelongated bar 12 having a head orretainer 20 disposed at an end of theelongated bar 12. Theinsertion tool 10 may be manipulated during surgery by maneuvering theelongated bar 12 to place thehook 50 in a desired position relative to a vertebral member (not shown). Theretainer 20 is configured to hold thehook 50 in a releasable manner. Thus, once thehook 50 is positioned, theinsertion tool 10 may be extracted, leaving thehook 50 substantially in the desired position. - The
retainer 20 is shaped to fill much of thesaddle portion 52 of thehook 50. In the embodiment shown, thesaddle portion 52 comprises spaced apartside walls 54 having a substantially U-shaped open channel therebetween. It is between theseside walls 54 that aspinal rod 60 of a spinal implant system is inserted. In the illustrated embodiment of ahook 50, theside walls 54 include a threadedcentral portion 56 into which aretaining member 70 is inserted to secure therod 60 within thesaddle portion 52 of thehook 50. - The
retainer 20 has a generally U-shaped configuration, which permits insertion of theretainer 20 into thesaddle portion 52 of thehook 50. Theretainer 20 further comprises a plurality of biasingmembers 22. In this embodiment, thebiasing members 22 are configured as cantilevered leaf springs and operate as engagement elements that contact thehook 50. Furthermore, in the embodiment shown, theretainer 20 has four biasingmembers 22, though a different number may be used. Theinsertion tool 10 is configured such that, when theretainer 20 is inserted into thesaddle 52 of thehook 50 as shown inFIG. 1 , thebiasing members 22 frictionally engageinner faces 58 of theside walls 54 on either side of the threadedportion 56. The biasing force applied by the biasingmembers 22 against theinner side walls 58 of thehook 50 is sufficient to support the weight of thehook 50. However, as suggested above, theretainer 20 and thebiasing members 22 hold thehook 50 in a releasable manner. Thus, thebiasing members 22 should not create so large a retaining force that theinsertion tool 10 cannot be extracted from thehook 50 as needed. - The
exemplary insertion tool 10 also includes an enlargedflange 14 adjacent to theretainer 20. Theflange 14 serves to limit the depth to which thehook 50 may be inserted onto theretainer 20. In addition, theflange 14 permits the application of an insertion force in the direction indicated by the letter F inFIG. 1 . For instance, it may be necessary to apply an insertion force in the direction of arrow F during surgical installation of thehook 50. However, once thehook 50 is positioned as desired, the arrangement of theretainer 20 andflange 14 allow theinsertion tool 10 to be removed in the directions indicated by arrow A or arrow P or some vector combination thereof. These arrows F, A, and P are shown relative to an X-Y-Z coordinate system. Note also that the direction of deflection of thebiasing members 22 caused by installation of thehook 50 onto theretainer 20 in one or more embodiments may be substantially aligned with the Y-coordinate. -
FIG. 3A shows arrows A and P relative to the same X-Y-Z coordinate system and to theentire insertion tool 10 andhook 50. Notably, theelongated bar 12 is substantially aligned with the direction of removal along arrow P. This direction P is towards the open part of the U-shaped channel in the saddle 52 (seeFIG. 2 ). This direction P is also substantially perpendicular to therod 60 that lies within the U-shaped channel insaddle 52. The ability to remove the insertion tool in this direction may help preserve the desire to maintain small surgical incisions and may also prevent interference with vertebrae or other anatomy (not shown). Furthermore, since theretainer 20 fits substantially within the interior of thesaddle 52, the extent to which theinsertion tool 10 is a limiting factor in guiding and placing thehook 50 in a desired position may be minimized. Also, the size of theinsertion tool 10 in the direction of arrow A may be minimized by adjusting the size of thebend 16 in theelongated bar 12 and the distance between thebend 16 and the distal end at which thehook 50 is attached. - As described above and shown in
FIG. 2 , theretainer 20 uses friction to grasp theinner surfaces 58 ofside walls 54 of thehook 50. Consequently, there is some amount of flexibility in orienting thehook 50 onto theretainer 20. That is, asFIG. 3B shows, thehook 50 may be rotated slightly up and down in the X-Z plane as indicated by the arrows H relative to theinsertion tool 10. This additional degree of flexibility may further improve approach angles during surgical installation as well as in removing theinsertion tool 10 from thehook 50. - The U-shaped configuration of the
retainer 20 is more clearly visible in the frontal view shown inFIG. 4 . This particular view is aligned with a longitudinal axis labeled D. Thebottom surface 24 is curved to fit within thesaddle 52 ofhook 50. In one embodiment, thebottom surface 24 ofretainer 20 has a radius of curvature that matches that of the bottom of saddle 52 (seeFIG. 2 ). This same radius of curvature may also correspond to a diameter of rod 60 (also shown inFIG. 2 ).FIG. 4 also illustrates a small outward bow of the biasingmembers 22 relative to the width of thebottom surface 24. The biasingmembers 22 are resilient and deflect inward, conforming to the size of thesaddle 52 of hook 50 (as shown inFIG. 1 ). The reaction force caused by this inward deflection supplies the friction that holds thehook 50 onto theretainer 20. -
FIG. 5 shows a top view of theexemplary retainer 20, including the biasingmembers 22, in relation to theflange 14 andelongated bar 12. Notably, themiddle portion 26 between the biasingmembers 22 extends wider than the biasing members 22 (also visible inFIG. 3 ). When theretainer 20 is inserted into thesaddle 52 of thehook 50 as shown inFIG. 1 , thesemiddle portions 26 fit within the threadedportion 56 of thehook 50. A close fit between themiddle portions 26 ofretainer 20 and the threadedportions 56 ofhook 50 may contribute to a more robust retention, reducing unwanted motion between the twoparts middle portion 26 may omitted in cases where thehook 50 or other vertebral implant does not have the threadedportions 56. -
FIG. 5 also shows that theretainer 20 is oriented along the longitudinal axis labeled D. The biasingmembers 22 are positioned in a free state and are spaced apart a first width W1 in a direction substantially perpendicular to the longitudinal axis D. When thehook 50 is attached as illustrated inFIG. 1 , the biasingmembers 22 deflect inward towards an engaged state where the biasing members are space apart a second width illustrated by the dimension labeled W2. This inward deflection of the biasingmembers 22 creates the outward retention force that keeps thehook 50 attached to theretainer 20. Note that the length of the retainer in the left to right direction ofFIG. 5 remains substantially constant. - An alternative embodiment of a
retainer 120 is illustrated inFIGS. 6-9 .FIG. 6 shows an exploded view of components in this particular embodiment. Theretainer 120 uses a biasingmember 122 to apply a retaining force to ahook 50. In the embodiment shown, the biasingmember 122 is a compression ring. The biasingmember 122 fits within arecess 126 formed between retainingwalls 128 of a substantiallyU-shaped retainer body 124 protruding from flange 114. In one embodiment, thisretainer body 124 is sized to fit within thesaddle 52 of thehook 50 shown inFIG. 2 . The biasingmember 123 is captured within therecess 126 by a substantiallycylindrical plug 130. Theplug 130 includes threeportions flange portion 132 has a diameter that is larger than the inner diameter of the biasingmember 122. Thebody portion 134 has a diameter that is smaller than the inner diameter of the biasingmember 122. Further, aplug portion 136 has a diameter that is sized to fit within a correspondingaperture 138 in theretainer body 124. Theplug portion 136 may be threaded to fit within a corresponding threadedaperture 138. Alternatively, theplug portion 136 may be press fitted into theaperture 138. In other embodiments, theplug portion 136 may be loosely fit intoaperture 138, but retained using an adhesive compound. As configured, theplug 130 may retain the biasingmember 122 as shown inFIG. 7 . - The biasing
member 122 further comprises agap 123 that is larger than acorresponding orienting feature 133 in thebody portion 134 of theplug 130. This relationship among these features is more readily visible inFIG. 8 , which shows a top view of theexemplary retainer 120. Thegap 123 in biasingmember 122 is aligned with the orientingfeature 133. Thegap 123 is wider than the orientingfeature 133 as evidenced by the existence ofgaps 123 on either side of the orientingfeature 133. Also as indicated, the body portion 134 (seeFIG. 6 ) has a diameter that is smaller than the biasingmember 122. This difference in size allows resilient compression of the biasingmember 122 in the direction indicated by the arrows labeled C inFIG. 8 , which is substantially perpendicular to the longitudinal axis D. -
FIG. 8 also shows that the biasingmember 122 is marginally wider than the retainingwalls 128 of theretainer body 124.FIG. 9 illustrates that this configuration mates with a corresponding configuration in ahook 50. Specifically, the biasingmember 122 in the present embodiment engages the threadedportion 56 of thesidewalls 54 ofhook 50.FIG. 9 also shows that upon inserting theretainer 120 into thehook 50, the biasingmember 122 compresses slightly, creating a reaction force that frictionally engages thehook 50. The compression of the biasingmember 122 is visible in the vicinity of the orientingfeature 133, where the amount ofgap 123 on either side of the orientingfeature 133 is reduced as compared toFIG. 8 . - In yet another embodiment of a
retainer 220 illustrated inFIGS. 10 and 11 , a biasingmember 222 is used to apply a frictional retaining force when compressed in the direction of arrows C. Asingle biasing member 222 is illustrated though a plurality may be used. However, in contrast with previously described embodiments, the biasingmember 222 in this embodiment does not directly contact ahook 50 of the type shown in the various Figures. Instead, the biasingmember 222 imparts a reactive force oncomplementary plungers 226 disposed within ahead 224 and that are configured to fit within the threadedportion 56 of thesidewalls 54 ofhook 50.FIG. 11 shows this same embodiment with thehook 50 attached to theretainer 220 and theplungers 226 compressed as compared to the position shown inFIG. 10 . - As with the embodiment of the
retainer 20 shown inFIGS. 1-2 , and 4-5, the retention mechanism created by biasingmembers hook 50. That is, the adjustability represented by the arrows labeled H inFIG. 3B is equally applicable to these embodiments of theretainer hook 50 may be rotated slightly up and down in the X-Z plane as indicated by the arrows H relative to theinsertion tool 10. This additional degree of flexibility may further improve approach angles during surgical installation as well as in removing theinsertion tool 10 from thehook 50. - In another embodiment of a
retainer 320 illustrated inFIGS. 12 and 13 , a biasingmember 222 similar to that shown inFIGS. 10 and 11 is used to apply a frictional retaining force when compressed in the direction of arrow C. Asingle biasing member 222 is illustrated though a plurality may be used. In contrast with the embodiment shown inFIGS. 10 and 11 , the biasingmember 222 imparts a reactive force on asingle plunger 226 that is disposed within ahead 324 and is also configured to fit within the threadedportion 56 ofsidewalls 54 ofhook 50.FIG. 12 shows this same embodiment with thehook 50 attached to theretainer 320 and thesingle plunger 226 compressed as compared to the position shown inFIG. 12 . - The present invention may be carried out in other specific ways than those herein set forth without departing from the scope and essential characteristics of the invention. For example, while certain embodiments described above have contemplated engaging a threaded
portion 56 on the interior of thesidewall 54 ofhook 50, other hooks may have threaded portions on the exterior of thesidewall 54 or transversely formed through thesidewalls 54. However, the friction forces applied by the various biasingmembers inner surface 58 of thesidewalls 54, regardless of the positioning or existence of threads. - Furthermore, while a
hook 50 has been used as an exemplary implant that may be placed with theinsertion tool 10, other implant devices may be positioned using the insertion tool. For instance, pedicle screws, clamps for securing a rod to a plate, and other items featuring a rod clamp similar to the illustratedsaddle 52 ofhook 50 may be inserted and positioned using theinsertion tool 10 disclosed herein. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, and all changes coming within the meaning and equivalency range of the appended claims are intended to be embraced therein. - Spatially relative terms such as “under”, “below”, “lower”, “over”, “upper”, “distal”, “proximal”, and the like, are used for ease of description to explain the positioning of one element relative to a second element. Further, the terms “down”, “downward”, “up”, “upward”, and the like, are used to explain the positioning of the elements as viewed in the Figures. These terms are intended to encompass different orientations of the device in addition to different orientations than those depicted in the figures. Further, terms such as “first”, “second”, and the like, are also used to describe various elements, regions, sections, etc and are also not intended to be limiting.
Claims (15)
1-19. (canceled)
20. A method of attaching a vertebral implant to an insertion tool, the method comprising:
aligning a retainer attached to an end of the insertion tool with the vertebral implant; contacting the retainer with the vertebral implant; moving the vertebral implant relative to the retainer thereby moving the retainer from a released position having a first width to an engaged position having a second width that is smaller than the first width; and applying an attachment force between the retainer and the vertebral implant while the retainer is in the engaged position and maintaining attachment of the vertebral implant to the insertion tool.
21. The method of claim 20 wherein the vertebral implant is a hook.
22. The method of claim 20 wherein moving the retainer from a released position having a first width to an engaged position having a second width that is smaller than the first width further comprises compressing a slotted ring.
23. The method of claim 20 wherein moving the retainer from a released position having a first width to an engaged position having a second width that is smaller than the first width further comprises deflecting a leaf spring.
24. The method of claim 20 wherein moving the retainer from a released position having a first width to an engaged position having a second width that is smaller than the first width further comprises moving the engagement element against a biasing force applied by a resilient biasing member.
25. The method of claim 20 wherein moving the vertebral implant relative to the retainer comprises rotating the vertebral implant about an axis that is substantially perpendicular to the first and second widths.
26. The method of claim 20 wherein moving the vertebral implant relative to the retainer comprises sliding the vertebral implant onto the retainer.
27. A method of attaching a vertebral implant to an insertion tool, the method comprising:
aligning a head attached to an end of the insertion tool with the vertebral implant, the head having a longitudinal axis;
contacting the vertebral implant with an engagement element that is operatively coupled to the head;
moving the vertebral implant relative to the engagement element thereby moving the engagement element from a released position to an engaged position, the engagement element disposed in closer proximity to the longitudinal axis in the engaged position than in the released position, the engagement element biased towards the released position; and
applying an attachment force between the engagement element and the vertebral implant while the engagement element is in the engaged position and maintaining attachment of the vertebral implant to the insertion tool.
28. The method of claim 27 wherein the vertebral implant is a hook.
29. The method of claim 27 wherein moving the engagement element from a released position to an engaged position further comprises compressing a slotted ring.
30. The method of claim 27 wherein moving the engagement element from a released position to an engaged position further comprises deflecting a leaf spring.
31. The method of claim 27 wherein moving the engagement element from a released position to an engaged position further comprises moving the engagement element against a biasing force applied by a resilient biasing member.
32. The method of claim 27 wherein moving the vertebral implant relative to the engagement element comprises sliding the vertebral implant onto the engagement element.
33. The method of claim 27 wherein moving the vertebral implant relative to the engagement element comprises rotating the vertebral implant about a plane in which the longitudinal axis lies, the plane being substantially perpendicular to a direction of movement of the engagement element from the released position to the engaged position.
Priority Applications (1)
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US12/695,424 US20100131020A1 (en) | 2005-12-20 | 2010-01-28 | Vertebral implant inserter and method of use |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US11/313,038 US7678114B2 (en) | 2005-12-20 | 2005-12-20 | Vertebral implant inserter and method of use |
US12/695,424 US20100131020A1 (en) | 2005-12-20 | 2010-01-28 | Vertebral implant inserter and method of use |
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US11/313,038 Division US7678114B2 (en) | 2005-12-20 | 2005-12-20 | Vertebral implant inserter and method of use |
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US20100131020A1 true US20100131020A1 (en) | 2010-05-27 |
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US12/695,424 Abandoned US20100131020A1 (en) | 2005-12-20 | 2010-01-28 | Vertebral implant inserter and method of use |
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US11/313,038 Active 2027-06-10 US7678114B2 (en) | 2005-12-20 | 2005-12-20 | Vertebral implant inserter and method of use |
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WO (1) | WO2007073537A1 (en) |
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Also Published As
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US20070161989A1 (en) | 2007-07-12 |
US7678114B2 (en) | 2010-03-16 |
WO2007073537A1 (en) | 2007-06-28 |
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