CA2495119A1 - Interspinal prosthesis - Google Patents

Interspinal prosthesis Download PDF

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Publication number
CA2495119A1
CA2495119A1 CA002495119A CA2495119A CA2495119A1 CA 2495119 A1 CA2495119 A1 CA 2495119A1 CA 002495119 A CA002495119 A CA 002495119A CA 2495119 A CA2495119 A CA 2495119A CA 2495119 A1 CA2495119 A1 CA 2495119A1
Authority
CA
Canada
Prior art keywords
prosthesis
counterpart
processes
coupling means
central part
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA002495119A
Other languages
French (fr)
Other versions
CA2495119C (en
Inventor
Claude Mathieu
Beat Lechmann
Paul Pavlov
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Synthes USA LLC
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2495119A1 publication Critical patent/CA2495119A1/en
Application granted granted Critical
Publication of CA2495119C publication Critical patent/CA2495119C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • A61B17/7062—Devices acting on, attached to, or simulating the effect of, vertebral processes, vertebral facets or ribs ; Tools for such devices
    • A61B17/7068—Devices comprising separate rigid parts, assembled in situ, to bear on each side of spinous processes; Tools therefor

Abstract

An interspinal prosthesis (1) comprising a middle piece (2) which can be introduced into the interspinal area and which has a center axis (4), an inn er end (7) and an outer end (8) in addition to two extensions (3) extending radially and diametrically with respect to the center axis (4), originating from the outer end (8), said extensions being able to be introduced into the interspinal area of two adjacent bodies of the vertebra. The inner end (7) o f the middle piece (2) opposite the extensions (3) has an axial recess (5) for receiving a counter piece (6) which is substantially symmetrical with respec t to the prosthesis (1).

Claims (31)

1. Interspinal prosthesis (1) with a central part (2) with a central axis (4), which can be introduced into the interspinal space, an inner end (7) and an outer end (8), as well as two processes (3), which arise at the outer end (8), extend radially and diametrically to the central axis (4) and can be introduced into the space between the spinous processes of two adjacent bodies of a vertebra, the central part (2), at its inner end (7) averted from the processes (3), having an axial depression (5) for accommodating a counterpart (6), which is essentially symmetrical to the prosthesis (1), characterized in that (A) the interspinal prosthesis is made from an elastic material, which permits an elastic deformation of the diameter of the central part (2) at it narrowest place (10) by 10 to 60% relative to the unstressed diameter and (B) the cross-sectional plane (9) through the central part (2), orthogonal to the central axis (4), has an area of 50 to 300 mm2 at its narrowest place (10) in the region of the inner end (7).
2. The prosthesis (1) of claim 1, characterized in that the central part (2) has coupling means (11), with which the counterpart (6) can be fixed in position thereto.
3. The prosthesis (1) of claims 1 or 2, characterized in that the cross sectional plane (9) through the central part (2), orthogonal to the central axis (4), has an area of 70 to 250 mm2 at its narrowest place in the region of the inner end (7).
4. The prosthesis (1) of one of the claims 1 to 3, characterized in that the cross sectional plane through the processes (3), orthogonal to the central axis (4), has an area of 70 to 500 mm2 and preferably of 100 to 450 mm2.
5. The prosthesis (1) of claims 1 to 4, characterized in that the elastic material permits an elastic deformation of 15 to 50% relative to the unstressed diameter.
6. The prosthesis (1) of claims 1 to 5, characterized in that it consists of a plastic with a Shore hardness of 65A to 90A.
7. The prosthesis (1) of claims 1 to 5, characterized in that it consists of a metallic material and that the central part (2) includes radially elastically deformable cogs.
8. The prosthesis (1) of one of the claims 1 to 7, characterized in that it is constructed hollow, so that its hollow-space walls (13) can either be collapsed or, by filling the hollow space (12) with a filling material, expanded.
9. The prosthesis (1) of one of the claims 1 to 8, characterized in that the central part (2) is constructed in the region of its inner end (7) with a smooth outer surface.
10. The prosthesis (1) of one of the claims 1 to 8, characterized in that the central part (2), in the region of its inner end (7), is roughened at its outer surface.
11. The prosthesis (1) of one of the claims 1 to 10, characterized in that hydroxy apatite (HA) is embedded in the prosthesis material at least on a portion of its surface.
12. The prosthesis (1) of one of the claims 2 to 11, characterized in that the coupling means (11) comprise a slide lock (27).
13. The prosthesis (1) of one of the claims 2 to 11, characterized in that the coupling means (11) comprise elastically deformable cams (10), which, after the prosthesis (1) and the counterpart (6) are assembled, can be lucked in position at the latter.
14. The prosthesis (1) of claim 13, characterized in that at least the coupling means (11) are provided with a borehole (20) coaxially to the central axis (4) and that the prosthesis (1) includes a pin, which can be introduced in the borehole (20).
15. The prosthesis (1) of one of the claims 2 to 11, characterized in that the coupling means (11) comprise a conical connection.
16 The prosthesis (1) of one of the claims 2 to 11, characterized in that the coupling means (11) comprise a screw connection.
17. The prosthesis (1) of one of the claims 13 to 16, characterized in that the prosthesis (1) includes a twisting safeguard, which can be accommodated in a counterpart (6).
18. The prosthesis (1) of claim 1, characterized in that the axial depression (5) of the central part (2) is constructed as a continuous borehole passing through the whole of the central part (2).
19. The prosthesis (1) of one of the claims 1 to 18, characterized in that the cross sectional areas of the processes (3), viewed parallel to the central axis (4), are semicircular areas.
20. The prosthesis (1) of one of the claims 1 to 19, characterized in that it has a counterpart (6), which fits into the axial depression (5) and comprises the following elements:
A) an inner end (14), B) an outer end (15);
C) two processes (3), which arise at the outer end (15), extend radially and diametrically to the central axis (4) and can be introduced into the space between two spinous processes of two adjacent vertebras and D) a peg (16), which is directed towards the inner end (14) and can be introduced into the depression (5) at the prosthesis (1).
21. The prosthesis (1) of claim 20, characterized in that the peg (16) of the counterpart (6) includes coupling means (11), with which the prosthesis can be fixed in position thereto.
22. The prosthesis (1) of claim 21, characterized in that the coupling means (11) comprise a slide lock.
23. The prosthesis (1) of claim 21, characterized in that the coupling means (11) comprise elastically deformable cams, which, after the counterpart (6) and the prosthesis (1) are assembled, can be locked in position at the counterpart (6).
24. The prosthesis (1) of claim 21, characterized in that the coupling means (11) comprise a conical connection.
25. The prosthesis (1) of claim 21, characterized in that the coupling means (11) comprise a screw connection.
26. The prosthesis (1) of one of the claims 22 to 25, characterized in that the prosthesis (1) includes a twisting safeguard, which can be accommodated in a counterpart (6).
27. The prosthesis (1) of one of the claims 20 to 26, characterized in that the cross sectional area of a processes (3), viewed parallel to central axis (4), are semicircular areas.
28. The prosthesis (1) of one of the claims 20 to 27, characterized in that, in the assembled state, it has a plane of symmetry, which is orthogonal to the central axis (4).
29. The interspinal prosthesis (1) of one of the claims 20 to 28, characterized in that the processes (3) of the prosthesis (1) are at a distance of at least 2 mm and preferably of at least 3 mm from those of the counterpart (6).
30. The prosthesis (1) of one of the claims 20 to 29, characterized in that the processes (3) of the prosthesis (1) are at a distance of at most 15 mm and preferably of at most 12 mm from those of the counterpart (6).
31. The prosthesis (1) of one of the claims 20 to 30, characterized in that the prosthesis (1) includes a first twisting safeguard and the counterpart (6) includes a second twisting safeguard, complementary to the first twisting safeguard, so that the processes (3) of the prosthesis (1) and the processes (3) of the counterpart (6) can be brought into a mutually aligned position.
CA002495119A 2001-08-20 2001-08-20 Interspinal prosthesis Expired - Fee Related CA2495119C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CH2001/000509 WO2003015645A1 (en) 2001-08-20 2001-08-20 Interspinal prosthesis

Publications (2)

Publication Number Publication Date
CA2495119A1 true CA2495119A1 (en) 2003-02-27
CA2495119C CA2495119C (en) 2010-02-02

Family

ID=4358234

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002495119A Expired - Fee Related CA2495119C (en) 2001-08-20 2001-08-20 Interspinal prosthesis

Country Status (9)

Country Link
US (1) US7442208B2 (en)
EP (1) EP1418852A1 (en)
JP (1) JP4947879B2 (en)
CN (1) CN1271974C (en)
CA (1) CA2495119C (en)
CZ (1) CZ2004212A3 (en)
SK (1) SK1002004A3 (en)
TW (1) TW534811B (en)
WO (1) WO2003015645A1 (en)

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US20040199255A1 (en) 2004-10-07
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CA2495119C (en) 2010-02-02
JP4947879B2 (en) 2012-06-06

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