Intervertebral prosthesis or disk prosthesis

Patent metadata

Field	Value
Publication number	US-8992618-B2
Application number	US-58772304-A
Country	US
Kind code	B2
Filing date	Apr 26, 2004
Priority date	Apr 26, 2004
Publication date	Mar 31, 2015
Grant date	Mar 31, 2015

Abstract

An intervertebral prosthesis or disk prosthesis comprising a front side, a rear side, an upper side which can be placed on the base plate of vertebral body, a lower side which can be placed on the base plate of a vertebral body, a right side, a left side, a cavity which can receive a fluid hydraulic osteocementum, an opening in the cavity and several outlets out from the cavity. The total of the transversal surfaces of the outlets SV on the front side, the total of the transversal surfaces of the outlets SH on the rear side, the total of the transversal surfaces of the outlets SR on the right side and the total of the transversal surfaces of the outlets on the left side satisfy the following conditions: SL>SR or SR>SL or SH>SV or SV>SH.

First claim

The invention claimed is:

1. An intervertebral implant system comprising:
an intervertebral implant for implantation between an upper vertebra and a lower vertebra;
a volume of flowable osteocementum; and
an insertion tool for conveying the flowable osteocementum to the intervertebral implant;
wherein the implant includes: a cavity defined by a body having a first end for engaging the insertion tool, the first end having an inlet opening for receiving the flowable osteocementum; a top surface for contacting at least a portion of the upper vertebra; a bottom surface for contacting at least a portion of the lower vertebra; a second end opposite the first end; a first lateral side being substantially straight and having a first length and at least one outlet, the at least one outlet having a combined cross-sectional area A1; a second lateral side being substantially straight and having a second length and at least one outlet, the at least one outlet of the second side having a combined cross-sectional area A2; wherein the first length is substantially the same as the second length and A1 is not equal to A2 thereby providing that the flowable osteocementum emerges asymmetrically, and wherein the second end is dosed so that the flowable osteocementum cannot emerge therefrom.

2. The implant of claim 1 , wherein A1 is greater than A2 so that the volume of osteocementum flowing through the first side is greater than the volume of osteocementum flowing through the second side.

3. The implant of claim 2 , further comprising a second intervertebral implant including
a cavity defined by a body having a first end for engaging an insertion tool, the first end having an inlet opening for receiving the flowable osteocementum; a top surface for contacting at least a portion of the upper vertebra; a bottom surface for contacting at least a portion of the lower vertebra; a second end opposite the first end; a first side having at least one outlet, the at least one outlet having a combined cross-sectional area A1; a second side having at least one outlet, the at least one outlet having a combined cross-sectional area A2; wherein A1 is greater than A2 thereby providing that the flowable osteocementum emerges asymmetrically and the second intervertebral implant is configured to be implanted adjacent to the first intervertebral implant such that the second side of the first intervertebral implant is facing the second side of the second intervertebral implant, and wherein the second end is closed so that the flowable osteocementum cannot emerge therefrom.

4. The implant of claim 1 , wherein the cavity comprises a cross-sectional area.

5. The implant of claim 4 , wherein the cavity extends from the inlet opening towards the second end.

6. The implant of claim 5 , wherein the cross-sectional area of the cavity decreases as the distance from the inlet opening increases.

7. The implant of claim 6 , wherein the cross-sectional area of the cavity decreases in one of a wedge-shaped or a conical shape.

8. The implant of claim 1 , wherein the top surface and the bottom surface converge towards the second end at least on a partial section.

9. An intervertebral implant system comprising:
an intervertebral implant for implantation between an upper vertebra and a lower vertebra;
a volume of flowable osteocementum; and
an insertion tool for conveying the flowable osteocementum to the intervertebral implant;
wherein the implant includes a body having a top surface for contacting at least a portion of the upper vertebra; a bottom surface for contacting at least a portion of the lower vertebra; a first end for engaging the insertion tool, the first end having an inlet opening for receiving the flowable osteocementum; a second end opposite the first end; an internal cavity with a cross-sectional area, the internal cavity extending from the inlet opening in the direction of the second end; a first lateral side being substantially straight and having a first length and at least one outlet, the outlets having a combined cross-sectional area A1; a second lateral side being substantially straight and having a second length and at least one outlet, the outlets of the second side having a combined cross-sectional area A2; wherein the first length is substantially the same as the second length and A1 is greater than A2 thereby providing that the flowable osteocementum emerges asymmetrically and such that when osteocementum flows through the implant, the volume of osteocementum that flows through the first side is greater than the volume of osteocementum that flows through the second side, and wherein the second end is closed so that the flowable osteocementum cannot emerge therefrom.

10. The implant of claim 9 , wherein the cross-sectional area of the cavity decreases as the distance from the inlet opening increases.

11. The implant of claim 9 , wherein the cross-sectional area of the cavity decreases in one of a wedge-shape or a conical shape.

12. The implant of claim 9 , wherein the top surface and the bottom surface converge towards the second end at least on a partial section.

Assignees

• Lechmann Beat
• Frigg Robert
• Buerki Roger
• Depuy Synthes Products Llc

Inventors

• Lechmann Beat
• Frigg Robert
• Buerki Roger

Classifications

• A61F2002/30593

  hollow · CPC title

• A61F2/446

  having a circular or elliptical cross-section substantially parallel to the axis of the spine, e.g. cylinders or frustocones · CPC title

• A61F2002/30785

  parallel · CPC title

• A61F2310/00353

  Bone cement, e.g. polymethylmethacrylate or PMMA · CPC title

• A61F2002/4631

  the prosthesis being specially adapted for being cemented · CPC title