WO2002026171A1 - Implant for substituting an intervertebral disc - Google Patents

Implant for substituting an intervertebral disc Download PDF

Info

Publication number
WO2002026171A1
WO2002026171A1 PCT/HU2001/000096 HU0100096W WO0226171A1 WO 2002026171 A1 WO2002026171 A1 WO 2002026171A1 HU 0100096 W HU0100096 W HU 0100096W WO 0226171 A1 WO0226171 A1 WO 0226171A1
Authority
WO
WIPO (PCT)
Prior art keywords
implant
central portion
substituting
intervertebral disc
outer portion
Prior art date
Application number
PCT/HU2001/000096
Other languages
French (fr)
Inventor
Miklós HORVÁTH
Iván FÜZES
Original Assignee
Horvath Miklos
Fuezes Ivan
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Horvath Miklos, Fuezes Ivan filed Critical Horvath Miklos
Priority to AU2001290161A priority Critical patent/AU2001290161A1/en
Publication of WO2002026171A1 publication Critical patent/WO2002026171A1/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
    • A61F2/442—Intervertebral or spinal discs, e.g. resilient
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30112—Rounded shapes, e.g. with rounded corners
    • A61F2002/30113—Rounded shapes, e.g. with rounded corners circular
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30772—Apertures or holes, e.g. of circular cross section
    • A61F2002/30784—Plurality of holes
    • A61F2002/30785—Plurality of holes parallel
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30795—Blind bores, e.g. of circular cross-section
    • A61F2002/30807—Plurality of blind bores
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30904—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves serrated profile, i.e. saw-toothed
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0004—Rounded shapes, e.g. with rounded corners
    • A61F2230/0006—Rounded shapes, e.g. with rounded corners circular
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00011—Metals or alloys
    • A61F2310/00023—Titanium or titanium-based alloys, e.g. Ti-Ni alloys

Definitions

  • the object of the present invention is an implant for substituting a surgically removed intervertebral disc.
  • Implants of different kinds are widely used in several fields of medicine.
  • Known art implants include dental implants and implants for fixing and in some cases substituting bones.
  • Patent application HU P96 03139 discloses an implant and method for stabilising a spine segment, where the implant is essentially an elastic textile bag filled with fine-grain transplant, with the transplant being cortical or cancellous pulverized bone graft, bone substitute, or a mixture thereof. The textile bag is placed on the segment to be stabilised.
  • An implant for fixing vertebrae is described by patent application HU P97
  • This implant is substantially a socket with external thread, made preferably of titanium, with the socket comprising a tanging element at at least one of the ends thereof.
  • Patent application HU P94 00863 discloses an intervertebral prosthesis for substituting part of the central area of an intervertebral disc.
  • the implant can be placed in a cavity formed in the central area of the intervertebral disc and can support compressive loads.
  • an implant that substitutes a surgically removed intervertebral disc, and is characterised by that it comprises an outer portion and a central portion arranged in a concentric configuration, where said outer portion and central portion are connected by slightly conical segments, with both ends of the central portion ending in support tips, and where the segments are formed in such a way that the outer surfaces thereof, extending from the outer por- tion to the central portion, comprise a toothing.
  • a preferred embodiment of the implant according to the present invention is characterised in that the support tips thereof have a vertex angle of 90°, and in that there are holes in the surface of the outer portion of the implant.
  • Another preferred embodiment of the implant according to the invention is characterised by being implemented in such a way that it can be opened.
  • Preferred embodiments of the implant according to the present invention are all manufactured of titanium.
  • Fig. 1 shows the broken section side view of the implant
  • Fig. 2 shows the top view of the implant according to the invention.
  • the implant shown in Fig. 1 can be applied for substituting a cervical intervertebral disc, and comprises an outer portion 1 and a cylindrical central portion 3, with the outer and the central portion being connected by segments 2.
  • the seg- ments 2 connecting the outer portion 1 and the central portion 3 are slightly coni- cally shaped in the direction of the central portion 3, and have toothing 6 on the outer surface thereof. Both ends of the inner portion 3 are shaped in such a way that they form 90° support tips.
  • the disc-shaped outer portion 1 comprises holes 5.
  • the implant shown in Fig. 1 is used for substituting a damaged and removed cervical intervertebral disc.
  • the implant is inserted into the space left behind the removed disc, with the support tips 4 located on the central portion 3 connecting to the middle part of the adjacent cervical vertebrae, and the support tips 4 and the toothing 6 of the segments 2 penetrably engage into the adjacent vertebrae.
  • Proper positioning of the implant ensures that the support tips 4 and the teeth 6 of the segments 2 stabilise the position of the implant, while allowing for the rotational movement of the cervical spine, finally resulting in the freer movement of the cervical spine and the head.
  • the implant according to the invention is manufactured of MRI-compatible titanium, which is also biocompatible and helps ingrowth. Ingrowth by surrounding tissue is also facilitated by the shape of the segments 2 and the holes 5 in the outer portion 1 of the implant.
  • a further advantage of the implant herein described is the lack of a complete desis which, as it is well known, would increase the risk of herniation of intervertebral discs located one segment higher and lower.
  • Application of the implant helps speed up the patient's recovery and retains flexibility of the cervical spine.
  • the implant disclosed here is primarily for substituting a cervical in- tervertebral disc, with a simple modification (consisting in implementing the implant in such a way that it can be opened) it can be used to replace a lumbar disc as well.
  • the implant is implemented in such a way that it can be opened, it is ensured that the spinal cord is well-protected and is "built in” during surgery.

Abstract

The present invention relates to an implant for substituting an intervertebral disc removed through surgery. The implant according to the invention is characterised by that it comprises a concentrically arranged outer portion (1) and central portion (3), where said outer portion and central portion are connected by slightly conical segments (2), with both ends of the central portion ending in support tips (4), and where the segments are formed so that they have toothing (6) on their outer surfaces extending form the outer portion (1) to the central portion (3).

Description

Implant for substituting an intervertebral disc
The object of the present invention is an implant for substituting a surgically removed intervertebral disc.
Implants of different kinds are widely used in several fields of medicine. Known art implants include dental implants and implants for fixing and in some cases substituting bones. Patent application HU P96 03139 discloses an implant and method for stabilising a spine segment, where the implant is essentially an elastic textile bag filled with fine-grain transplant, with the transplant being cortical or cancellous pulverized bone graft, bone substitute, or a mixture thereof. The textile bag is placed on the segment to be stabilised. An implant for fixing vertebrae is described by patent application HU P97
00532. This implant is substantially a socket with external thread, made preferably of titanium, with the socket comprising a tanging element at at least one of the ends thereof.
Patent application HU P94 00863 discloses an intervertebral prosthesis for substituting part of the central area of an intervertebral disc. The implant can be placed in a cavity formed in the central area of the intervertebral disc and can support compressive loads.
The main disadvantage of prior art solutions is that they are difficult to handle. It is an objective of the invention to provide an implant that is suitable for substituting particularly a cervical intervertebral disc while speeding up the healing process and retaining the flexibility of the cervical spine.
Objectives of the invention are achieved by an implant that substitutes a surgically removed intervertebral disc, and is characterised by that it comprises an outer portion and a central portion arranged in a concentric configuration, where said outer portion and central portion are connected by slightly conical segments, with both ends of the central portion ending in support tips, and where the segments are formed in such a way that the outer surfaces thereof, extending from the outer por- tion to the central portion, comprise a toothing.
A preferred embodiment of the implant according to the present invention is characterised in that the support tips thereof have a vertex angle of 90°, and in that there are holes in the surface of the outer portion of the implant.
Another preferred embodiment of the implant according to the invention is characterised by being implemented in such a way that it can be opened.
Preferred embodiments of the implant according to the present invention are all manufactured of titanium.
The implant according to the present invention is exemplified in detail referring to the attached drawings showing a preferred embodiment, where Fig. 1 shows the broken section side view of the implant, and
Fig. 2 shows the top view of the implant according to the invention.
The implant shown in Fig. 1 can be applied for substituting a cervical intervertebral disc, and comprises an outer portion 1 and a cylindrical central portion 3, with the outer and the central portion being connected by segments 2. The seg- ments 2 connecting the outer portion 1 and the central portion 3 are slightly coni- cally shaped in the direction of the central portion 3, and have toothing 6 on the outer surface thereof. Both ends of the inner portion 3 are shaped in such a way that they form 90° support tips.
The disc-shaped outer portion 1 comprises holes 5. The implant shown in Fig. 1 is used for substituting a damaged and removed cervical intervertebral disc. The implant is inserted into the space left behind the removed disc, with the support tips 4 located on the central portion 3 connecting to the middle part of the adjacent cervical vertebrae, and the support tips 4 and the toothing 6 of the segments 2 penetrably engage into the adjacent vertebrae. Proper positioning of the implant ensures that the support tips 4 and the teeth 6 of the segments 2 stabilise the position of the implant, while allowing for the rotational movement of the cervical spine, finally resulting in the freer movement of the cervical spine and the head. The implant according to the invention is manufactured of MRI-compatible titanium, which is also biocompatible and helps ingrowth. Ingrowth by surrounding tissue is also facilitated by the shape of the segments 2 and the holes 5 in the outer portion 1 of the implant.
A further advantage of the implant herein described is the lack of a complete desis which, as it is well known, would increase the risk of herniation of intervertebral discs located one segment higher and lower.
Application of the implant helps speed up the patient's recovery and retains flexibility of the cervical spine.
Though the implant disclosed here is primarily for substituting a cervical in- tervertebral disc, with a simple modification (consisting in implementing the implant in such a way that it can be opened) it can be used to replace a lumbar disc as well.
If the implant is implemented in such a way that it can be opened, it is ensured that the spinal cord is well-protected and is "built in" during surgery.

Claims

Claims
1. Implant for substituting a surgically removed intervertebral disc, characterised by that it comprises an outer portion (1) and a central portion (3) arranged in a concentric configuration, where said outer portion (1) and central portion (3) are connected by slightly conical segments (2), with both ends of the central portion (3) having support tips (4), and where the segments (2) are formed so that the outer surfaces thereof, extending from the outer portion (1) to the central portion (3), comprise a toothing (6).
2. The implant according to Claim 1, characterised in that the support tips (4) thereof have a vertex angle of 90°.
3. The implant according to Claims 1-2, characterised by that there are holes (5) in the surface of the outer portion (1) thereof.
4. The implant according to any one of Claims 1-3, characterised by that it is implemented in such a way that it can be opened.
5. The implant according to any one of Claims 1-4, characterised by that it is manufactured of titanium.
PCT/HU2001/000096 2000-09-28 2001-09-28 Implant for substituting an intervertebral disc WO2002026171A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001290161A AU2001290161A1 (en) 2000-09-28 2001-09-28 Implant for substituting an intervertebral disc

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
HUP0003833 2000-09-28
HU0003833A HUP0003833A2 (en) 2000-09-28 2000-09-28 Implant for replacing of vertebral disc

Publications (1)

Publication Number Publication Date
WO2002026171A1 true WO2002026171A1 (en) 2002-04-04

Family

ID=89978634

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/HU2001/000096 WO2002026171A1 (en) 2000-09-28 2001-09-28 Implant for substituting an intervertebral disc

Country Status (3)

Country Link
AU (1) AU2001290161A1 (en)
HU (1) HUP0003833A2 (en)
WO (1) WO2002026171A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5306308A (en) * 1989-10-23 1994-04-26 Ulrich Gross Intervertebral implant
US5609635A (en) * 1988-06-28 1997-03-11 Michelson; Gary K. Lordotic interbody spinal fusion implants
US5888228A (en) * 1995-10-20 1999-03-30 Synthes (U.S.A.) Intervertebral implant with cage and rotating element
WO2000044319A1 (en) * 1999-01-27 2000-08-03 Disc-O-Tech Medical Technologies, Ltd. Expandable intervertebral spacer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5609635A (en) * 1988-06-28 1997-03-11 Michelson; Gary K. Lordotic interbody spinal fusion implants
US5306308A (en) * 1989-10-23 1994-04-26 Ulrich Gross Intervertebral implant
US5888228A (en) * 1995-10-20 1999-03-30 Synthes (U.S.A.) Intervertebral implant with cage and rotating element
WO2000044319A1 (en) * 1999-01-27 2000-08-03 Disc-O-Tech Medical Technologies, Ltd. Expandable intervertebral spacer

Also Published As

Publication number Publication date
HU0003833D0 (en) 2000-12-28
AU2001290161A1 (en) 2002-04-08
HUP0003833A2 (en) 2002-04-29

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