Interspinous process implant having a body with a removable end portion

Patent metadata

Field	Value
Publication number	US-9861399-B2
Application number	US-201615159189-A
Country	US
Kind code	B2
Filing date	May 19, 2016
Priority date	Mar 13, 2009
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

An interspinous process implant is disclosed that includes an elongated threaded implant body defining a longitudinal axis and having a main body portion with opposed proximal and distal end portions, and a removable body portion operatively connected to the proximal end portion of the main body portion, a distal anchor assembly including two deployable anchor blades mounted for pivotal movement between a stowed position located within an interior cavity of the main body portion and a deployed position radially extending from the main body portion, and a proximal anchor assembly including an anchor collar mounted for longitudinal movement along the longitudinal axis of the implant body between a first position spaced apart from the distal anchor assembly and a second position approximated with the distal anchor assembly.

First claim

What is claimed is:

1. An interspinous process implant comprising:
a) an elongated threaded implant body defining a longitudinal axis and having a main body portion with opposed proximal and distal end portions, and a removable body portion operatively connected to the proximal end portion of the main body portion, wherein the elongated implant body is threaded along the length thereof, including the main body portion and the removable body portion;
b) a distal anchor assembly including two deployable anchor blades mounted for pivotal movement between a stowed position located within an interior cavity of the main body portion and a deployed position radially extending from the main body portion; and
c) a proximal anchor assembly including an anchor collar mounted for longitudinal movement along the longitudinal axis of the implant body between a first position spaced apart from the distal anchor assembly and a second position approximated with the distal anchor assembly.

2. An interspinous process implant as recited in claim 1 , further comprising a locking ring threadably associated with the implant body for securing the axial position of the anchor collar with respect to the implant body.

3. An interspinous process implant as recited in claim 2 , wherein the locking ring has a pair of diametrically opposed, arcuate shaped, cantilevered pawls, each with distal facing teeth for engaging a corresponding set of teeth on a proximal facing surface of the anchor collar.

4. An interspinous process implant as recited in claim 2 , wherein the anchor collar and the locking ring of the proximal anchor assembly are operatively connected to one another to in such a manner so as to allow relative rotation of the anchor collar and locking ring.

5. An interspinous process implant as recited in claim 1 , wherein the main body portion and the removable body portion are connected to one another by way of a threaded connection.

6. An interspinous process implant as recited in claim 1 , wherein the main body portion has threaded proximal bore and the removable body portion has a threaded distal shaft section for threadably engaging the threaded proximal bore of the main body portion.

7. An interspinous process implant as recited in claim 1 , wherein the main body portion and the removable body portion are connected to one another by way of a frangible connection.

8. An interspinous process implant as recited in claim 1 , wherein the main body portion and the removable body portion are connected to one another by way of an interference fit.

9. An interspinous process implant as recited in claim 8 , wherein the main body portion has a proximal tapered bore and the removable body portion has a frusto-conical distal end section for frictionally engaging the tapered bore of the main body portion.

10. An interspinous process implant as recited in claim 8 , wherein the main body portion has an annual reception slot formed in a proximal end thereof and the removable body portion has an annular flange extending from the distal end thereof for frictionally engaging the annular reception slot of the main body portion.

11. An interspinous process implant as recited in claim 8 , wherein the main body portion has proximal bore with diametrically opposed flattened anti-rotation walls and the removable body portion has a distal stem with corresponding diametrically opposed flattened anti-rotation surfaces.

12. An interspinous process implant as recited in claim 1 , wherein the main body portion and the removable body portion are connected to one another by way of an a plurality of circumferentially spaced apart interlocking structures.

13. An interspinous process implant as recited in claim 12 , wherein the main body portion includes a proximal bore including a set of circumferentially spaced apart radially inwardly projecting hemi-spherical protuberances for engaging a corresponding set of circumferentially spaced apart radially inwardly extending hemi-spherical recess formed on a distal stem of the removable body portion.

14. An interspinous process implant as recited in claim 12 , wherein the main body portion includes a bore including a set of circumferentially spaced apart radially outwardly projecting hemi-spherical recesses for engaging a corresponding set of circumferentially spaced apart radially outwardly extending hemi-spherical protuberances formed on a distal stem of the removable body portion.

15. An interspinous process implant as recited in claim 14 , wherein the proximal bore in the main body portion has a polygonal cross-section and the distal stem of the removable body portion has a corresponding polygonal cross-section.

16. An interspinous process implant as recited in claim 15 , wherein the hemi-spherical protuberances on the distal stem of the removable body portion are spring loaded.

17. An interspinous process implant as recited in claim 15 , wherein each of the hemi-spherical protuberances on the distal stem of the removable body portion are located on an integrally formed flexible cantilevered tab.

18. An interspinous process implant as recited in claim 1 , wherein the main body portion and the removable body portion are connected to one another by way of a ratchet connection.

19. An interspinous process implant as recited in claim 18 , wherein the main body portion includes a pair of diametrically opposed, arcuate shaped, cantilevered pawls, each with proximally facing teeth for engaging a corresponding set of teeth on a distal facing surface of the removable body portion.

20. An interspinous process implant as recited in claim 1 , wherein the removable body portion is made of a biological material that can be absorbed over time by a patient's body.

21. An interspinous process implant as recited in claim 1 , wherein the removable body portion includes a proximal bore for receiving a distal end portion of a removal tool.

22. An interspinous process implant as recited in claim 1 , wherein an actuation assembly is disposed within the implant body for selectively deploying the distal anchor assembly, and wherein the actuation assembly includes a plunger body mounted for longitudinal movement between a proximal position and a distal position.

23. An interspinous process implant as recited in claim 22 , wherein the plunger body includes a proximal annular spring for releasably engaging an annular groove formed within an interior cavity of the removable body portion and a distal annular spring for releasably engaging an annular groove formed within the interior cavity of the main body portion, to mechanically connect the releasable body portion to the main body portion.

24. An interspinous process implant as recited in claim 23 , wherein movement of the plunger body from its proximal position to its distal position, to deploy the distal anchor assembly, further results in disconnecting the removable body portion from the main body portion.

25. An interspinous process implant as recited in claim 22 , where the actuation assembly prevents separation of the main body portion and the removable body portion when disposed in a first position, and allows separation of the main body portion and the removable body portion when disposed in a second position.

26. An interspinous process implant as recited in claim 1 , wherein the main body portion and the removable body portion are operatively connected to one another by way of an inserti

Assignees

• Spinal Simplicity Llc

Inventors

• Rogers Adam
• Frock Melissa
• Moseley Todd
• Hess Harold
• Slover Jeff
• Frock Adam
• Snell Douglas

Classifications

• A61B2017/00004

  (bio)absorbable, (bio)resorbable or resorptive · CPC title

• A61B17/7065

  Devices with changeable shape, e.g. collapsible or having retractable arms to aid implantation; Tools therefor · CPC title

• A61B17/00234

  for minimally invasive surgery (A61B17/0218, A61B17/0469, A61B17/12013, A61B17/1285, A61B17/29, A61B17/320016 take precedence) · CPC title

• A61B17/7068 Primary

  Devices comprising separate rigid parts, assembled in situ, to bear on each side of spinous processes; Tools therefor · CPC title