Expandable spinal implant system and method

Patent metadata

Field	Value
Publication number	US-9655738-B2
Application number	US-201514816757-A
Country	US
Kind code	B2
Filing date	Aug 3, 2015
Priority date	Oct 12, 2012
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

A spinal implant comprises a first member defining a longitudinal axis and including a wall that defines an axial cavity and at least one lateral opening configured for disposal of an instrument. A second member is configured for disposal with the axial cavity and includes a wall having an axial surface disposed along a thickness thereof. The axial surface defines at least a portion of an axial opening and includes a plurality of gear teeth disposed therealong. The instrument is engageable with the teeth to axially translate the second member relative to the first member. Systems and methods of use are disclosed.

First claim

What is claimed is:

1. A spinal implant comprising:
a first member defining a longitudinal axis and including a wall that defines a first axial cavity and a lateral opening configured for disposal of an instrument; and
a second member configured for disposal with the first axial cavity and including a wall that defines a second axial cavity, the wall of the second member having a first axial surface and a second axial surface that faces the first axial surface, at least one of the axial surfaces including a plurality of mating elements disposed therealong, wherein the first member is spaced apart from the first and second axial surfaces and the instrument is engageable with the mating elements to axially translate the second member relative to the first member.

2. A spinal implant as recited in claim 1 , wherein the mating elements are gear teeth.

3. A spinal implant as recited in claim 1 , wherein the first member comprises at least one opening that extends through a thickness of the wall of the first member, the at least one opening being spaced apart from the lateral opening.

4. A spinal implant as recited in claim 1 , wherein the first member comprises at least one opening that extends through a thickness of the wall of the first member, the at least one opening being spaced apart from the lateral opening and offset from the lateral opening along the longitudinal axis.

5. A spinal implant as recited in claim 1 , wherein the instrument is configured for rotation relative to the members in a first rotational direction to move the second member relative to the first member in a first direction and in a second rotational direction to move the second member relative to the first member in a second direction.

6. A spinal implant as recited in claim 1 , wherein the axial cavities are coaxial.

7. A spinal implant as recited in claim 1 , wherein the second member has a length defined by a distance between opposite first and second end surfaces of the second member, the second axial cavity extending through the end surfaces.

8. A spinal implant as recited in claim 1 , wherein the lateral opening has a non-threaded configuration.

9. A spinal implant as recited in claim 1 , wherein the first member comprises a first end surface and the second member comprises a second end surface that faces away from the first end surface, the end surfaces each comprising a plurality of spaced apart projections configured for fixation with vertebral tissue.

10. A spinal implant as recited in claim 1 , wherein the first member comprises a first end plate having a first end face and the second member comprises a second end plate having a second end face that faces away from the first end face, the end faces each comprising a plurality of spaced apart projections configured to penetrate vertebral tissue, the second end plate having a maximum diameter that is greater than that of the first axial cavity.

11. A spinal implant as recited in claim 1 , wherein the members each have a circular cross-sectional configuration.

12. A spinal implant as recited in claim 1 , wherein the members are monolithic.

13. A spinal implant as recited in claim 1 , wherein the mating elements comprise arcuate side portions.

14. A spinal implant as recited in claim 1 , further comprising the instrument, wherein the instrument is movable between a first position in which the instrument is spaced apart from the members and a second position in which mating elements of the instrument engage the mating elements of the second member.

15. A spinal implant comprising:
an outer body defining a longitudinal axis and extending between a first end and a second end configured to engage vertebral tissue, the outer body including a first tubular wall having an inner surface that defines a first axial cavity and a lateral opening configured for disposal of an instrument including a pinion gear shaft; and
an inner body extending between a first end and a second end configured to engage vertebral tissue, the inner body including a second tubular wall having an inner surface that defines a second axial cavity, the inner body being configured for disposal with the axial cavity such that the walls are concentric with the longitudinal axis, the wall of the inner body having a first axial surface and a second axial surface that faces the first axial surface, at least one of the axial surfaces including a gear rack disposed therealong,
wherein the inner body is spaced apart from the first and second axial surfaces and the pinion gear shaft is engageable with the rack to axially translate the inner body relative to the outerbody between a first, nested configuration and a second, expanded configuration.

16. A spinal implant as recited in claim 15 , wherein the lateral opening has a non-threaded configuration.

17. A spinal implant as recited in claim 15 , wherein the second end of the outer body comprises a first end plate having a first end face and the second end of the inner body comprises a second end plate having a second end face that faces away from the first end face, the end faces each comprising a plurality of spaced apart projections configured to penetrate vertebral tissue, the second end plate having a maximum diameter that is greater than that of the first axial cavity.

18. A spinal implant as recited in claim 15 , wherein the wall of the inner body comprises a plurality of inwardly oriented surfaces that define a second lateral opening that extends transverse to the longitudinal axis, the second lateral opening comprising arcuate side portions.

19. A spinal implant as recited in claim 15 , further comprising the instrument, wherein the instrument is movable between a first position in which the instrument is spaced apart from the bodies and a second position in which the pinion gear shaft engages the rack.

20. An spinal implant system comprising:
a first member defining a longitudinal axis and extending between a first end and a second end configured to engage vertebral tissue, the first member including a wall that defines a first axial cavity and a lateral opening having a non-threaded configuration, the second end of the first member comprising a first end plate having a first end face, the first member having a circular cross-sectional configuration;
a second member extending between a first end and a second end configured to engage vertebral tissue, the second member being configured for disposal with the axial cavity and including a wall defining a second axial cavity that is coaxial with the first axial cavity, the wall of the second member having a first axial surface and a second axial surface that faces the first axial surface, at least one of the axial surfaces including a plurality of gear teeth disposed therealong, the first member beings spaced apart from the first and second axial surfaces, the second end of the second member comprising a second end plate having a second end face that faces away from the first end face, the second end plate having a maximum diameter that is greater than that of the first axial cavity, the second member having a circular cross-sectional configuration;
an instrument configured to extend through the lateral opening, the instrument including a pinion gear shaft that is engageable with the teeth to axially translate the second member relative to the first member; and
bone graft configured for disposal in at least one of the axial cavities.

Assignees

• Warsaw Orthopedic Inc

Inventors

• Stinchfield Thomas
• Prevost Julien J

Classifications

• A61F2002/30593

  hollow · CPC title

• A61F2002/30433

  using additional screws, bolts, dowels, rivets or washers e.g. connecting screws · CPC title

• A61F2002/30405

  made by screwing complementary threads machined on the parts themselves · CPC title

• A61F2310/00179

  Ceramics or ceramic-like structures · CPC title

• A61F2002/30064

  Coating or prosthesis-covering structure made of biodegradable material · CPC title