Dynamized interspinal implant

• US 9,949,769 B2
• Filed: 03/01/2017
• Issued: 04/24/2018
• Est. Priority Date: 03/06/2004
• Status: Active Grant

• Current Assignee: Depuy Synthes Products Incorporated (Johnson & Johnson)
• Original Assignee: Depuy Synthes Products Incorporated (Johnson & Johnson)
• Inventors: Serhan, Hassan, DiNello, Alexander Michel, Christianson, William
• Primary Examiner(s): Philogene, Pedro
• Assistant Examiner(s): Comstock, David C
• Application Number:
  US15/446,554
• Publication Number:
  US 20170172632A1
• Time in Patent Office: 419 Days
• Field of Search: 606246-249, 623 1711, 623 1713, 623 1715, 623 1716
• CPC Class Codes: A61B 17/7062 Devices acting on, attached to, or simulating the effect of, vertebral processes, vertebral facets or ribs rib fixation devices A61B17/8076; Tools for such devices
• CPC Class Codes: A61B 17/7065 Devices with changeable shape, e.g. collapsible or having retractable arms to aid implantation; Tools therefor
• CPC Class Codes: A61B 17/7068 Devices comprising separate rigid parts, assembled in situ, to bear on each side of spinous processes; Tools therefor
• CPC Class Codes: A61B 2017/00075 Motion
• CPC Class Codes: A61B 2017/00221 with wireless transmission of data, e.g. by infrared radiation or radiowaves
• CPC Class Codes: A61B 2017/00964 composite
• CPC Class Codes: A61B 2017/567 Joint mechanisms or joint supports in addition to the natural joints and outside the joint gaps
• CPC Class Codes: A61B 2017/681 Alignment, compression, or distraction mechanisms
• CPC Class Codes: A61F 2/4405 for apophyseal or facet joints, i.e. between adjacent spinous or transverse processes devices implanted between spinous or transverse processes A61B17/7062
• CPC Class Codes: A61F 2/482 Electrical means

Abstract

An interspinous process having a narrowed distal portion.

Claims

1. An implant positionable between adjacent vertebrae, the implant comprising:

an upper portion having a porous superior bone-contacting surface adapted to bear upon an upper vertebra and to promote bony ingrowth;

first and second extensions projecting upwards from the superior surface and extending above the superior surface;

a lower portion having a porous inferior bone-contacting surface adapted to bear upon a lower vertebra and to promote bony ingrowth;

first and second extensions projecting downwards from the inferior surface and extending below the inferior surface; and

a curved anterior wall connecting the upper and lower portions;

wherein the implant is formed from titanium alloy, and

wherein the implant is symmetrical about a transverse plane that extends through a midpoint of the curved anterior wall.

2. The implant of claim 1, wherein the upper and lower portions are substantially non-parallel.

3. The implant of claim 1, wherein the implant has a stiffness between 100 N/mm and 500 N/mm.

4. The implant of claim 1, wherein the superior and inferior porous surfaces each comprise a layer of small spherical particles or beads.

5. The implant of claim 1, further comprising an inner core disposed between the upper and lower portions.

6. The implant of claim 5, wherein a stiffness of the core is configured to increase post-operatively.

7. The implant of claim 1, further comprising metallic sidewalls extending between and formed integrally with the upper and lower portions.

8. The implant of claim 1, wherein the implant has a height between 10 mm and 20 mm, a length between 20 mm and 30 mm, and a width between 5 mm and 10 mm.

9. An implant for placement between adjacent vertebrae, the implant comprising:

an upper portion having first and second upwardly-projecting extensions and a porous region disposed between the first and second extensions, the porous region being adapted to bear upon an upper vertebra and to promote bony ingrowth;

a lower portion having first and second downwardly-projecting extensions and a porous region disposed between the first and second extensions, the porous region being adapted to bear upon a lower vertebra and to promote bony ingrowth; and

a curved anterior surface extending between the upper and lower portions;

wherein the implant is formed from titanium alloy, and

wherein each of the first and second upwardly-projecting extensions and the first and second downwardly-projecting extensions has an end surface, said end surfaces lying in a common plane.

10. The implant of claim 9, wherein the upper and lower portions are substantially non-parallel.

11. The implant of claim 9, wherein the implant has a stiffness between 100 N/mm and 500 N/mm.

12. The implant of claim 9, wherein the porous regions each comprise a layer of small spherical particles or beads.

13. The implant of claim 9, further comprising an inner core disposed between the upper and lower portions.

14. The implant of claim 13, wherein a stiffness of the core is configured to increase post-operatively.

15. The implant of claim 9, further comprising metallic sidewalls extending between and formed integrally with the upper and lower portions.

16. The implant of claim 9, wherein the implant has a height between 10 mm and 20 mm, a length between 20 mm and 30 mm, and a width between 5 mm and 10 mm.