Devices and methods for vertebrostenting

• US 9,504,506 B2
• Filed: 01/15/2010
• Issued: 11/29/2016
• Est. Priority Date: 12/15/2006
• Status: Active Grant

• Current Assignee: Globus Medical, Inc.
• Original Assignee: Globus Medical, Inc.
• Inventors: Crainich, Lawrence, Sennett, Andrew R., Trabka, Joseph
• Primary Examiner(s): LAWSON, MATTHEW JAMES
• Application Number:
  US12/688,429
• Publication Number:
  US 20100121333A1
• Time in Patent Office: 2,510 Days
• Field of Search: 606 79- 86 R, 606167-169, 606/171, 606/172, 606/175, 600139-152
• US Class Current: 1/1
• CPC Class Codes: A61B 17/16 Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans arthroscopic bone cutters A61B17/320016; dental implant drills potentially for other surgical use A61C8/0089; bone grinders A61F2/4644, A22C17/06; A61B17/1662 takes precedence over all other subgroups except A61B17/17
• CPC Class Codes: A61B 17/1617 with mobile or detachable parts
• CPC Class Codes: A61B 17/1637 Hollow drills or saws producing a curved cut, e.g. cylindrical A61B10/025, A61B17/1695 take precedence
• CPC Class Codes: A61B 17/1642 for producing a curved bore
• CPC Class Codes: A61B 17/1671 for the spine
• CPC Class Codes: A61B 17/88 Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices A61B17/7074 takes precedence
• CPC Class Codes: A61B 17/8805 for introducing fluid filler into bone or extracting it A61B17/7097, A61B17/8833 take precedence
• CPC Class Codes: A61B 17/8808 with sealing collar for bone cavity
• CPC Class Codes: A61B 17/8816 characterised by the conduit, e.g. tube, along which fluid flows into the body or by conduit connections
• CPC Class Codes: A61B 17/8822 characterised by means facilitating expulsion of fluid from the introducer, e.g. a screw pump plunger, hydraulic force transmissions, application of vibrations or a vacuum
• CPC Class Codes: A61B 17/885 Tools for expanding or compacting bones or discs or cavities therein A61B17/8805, A61B17/7097 take precedence
• CPC Class Codes: A61B 17/8858 laterally or radially expansible inflatable A61B17/8855

Abstract

The invention relates to a method of creating a curvilinear cavity within a vertebral body or other body structure. The invention also relates to devices that may be used to perform the steps to create the curvilinear cavity. One such device is a curved drill including a lever and cam sub assembly. The curved drill can include a spring assembly that controls the curvature of the drill. The lever and cam sub assembly can be provided to allow tension to be reduced in the spring assembly.

Claims

1. An apparatus for treating a vertebral body comprising:

a handle;

a flexible shaft assembly extending from a distal end of the handle, wherein the flexible shaft assembly comprises a compression spring and a band retention element; and

a lever and cam sub assembly for varying a force used to apply a curvature to a distal end of the flexible shaft assembly, wherein the lever has a first position that is against the handle and a second position that is away from the handle, wherein the lever and cam sub assembly comprises a cam and a cam pusher assembly having a proximal-most end and a distal end, wherein the cam is egg-shaped having an outer surface wall with a small radius side and a large radius side, wherein the cam pusher assembly is in contact with an outer most surface of the cam, and the band retention element is positioned outside of the cam, wherein in the first position, the small radius side of the cam contacts the proximal-most end of the cam pusher assembly, and when the lever is moved from the first position to the second position, the large radius side of the cam contacts the proximal-most end of the cam pusher assembly to linearly translate the cam pusher assembly along a length of the apparatus.

2. The apparatus of claim 1, wherein the outer surface wall of the cam is eccentric.

3. The apparatus of claim 2, wherein the position of the lever is infinitely variable within a range bounded by the first position and second position.

4. The apparatus of claim 1, wherein the force used to apply a curvature is applied to the distal end of the flexible shaft assembly by a band connected at a proximal end to the band retention element and at a distal end to a distal portion of the flexible shaft assembly.

5. The apparatus of claim 1, wherein the compression spring is adapted to bias the band retention element against the cam pusher assembly when the lever is in the first position against the handle.

6. The apparatus of claim 1, wherein the flexible shaft assembly comprises:

a cutting tip located at a distal end of the flexible drill shaft assembly;

a flexible rotatable drive shaft coupled to the cutting tip; and

a flexible, moveable and non-rotatable housing.

7. The apparatus of claim 6, wherein the cutting tip is adapted to form a curvilinear void by simultaneous rotation and curvilinear translation of the cutting tip.

8. The apparatus of claim 1, wherein the flexible shaft assembly comprises:

a pivotable reaming blade located at a distal end of the flexible drill shaft assembly;

a flexible rotatable drive shaft coupled to the pivotable reaming blade; and

a flexible, moveable and non-rotatable housing.

9. The apparatus of claim 8, wherein the reaming blade is adapted to pivot from a first position to a second position.

10. The apparatus of claim 8, wherein the reaming blade is adapted to form a curvilinear void by simultaneous rotation and curvilinear translation of the reaming blade.

11. The apparatus of claim 1, wherein the handle includes a retaining pin and a drive shaft, wherein the retaining pin anchors a proximal end of the drive shaft to the handle.

12. The apparatus of claim 11, wherein the retaining pin is positioned between the cam and the band retention element.

13. The apparatus of claim 1, wherein the handle includes a feed screw and a feed nut threaded onto the feed screw, the compression spring is positioned between the feed screw and the band retention element, and the feed nut has a locking flange configured to releasably lock the handle to a cannula.

14. An apparatus for treating a vertebral body comprising:

a handle;

a flexible shaft assembly extending from a distal end of the handle, wherein the flexible shaft assembly comprises a compression spring and a band retention element; and

a lever and cam sub assembly for varying a force used to apply a curvature to a distal end of the flexible shaft assembly, wherein the lever and cam sub assembly comprises a lever, a drill cam and a cam pusher assembly, wherein the cam pusher assembly is independent from the band retention element, wherein the cam is egg-shaped having an outer surface wall with a small radius side and a large radius side, wherein the cam pusher assembly is in contact with an outer most surface of the cam, and the band retention element is positioned outside of the cam,

wherein the lever is configured to pivot the drill cam to push the cam pusher assembly and band retention element toward the compression spring, thereby placing the compression spring in compression,

wherein the cam pusher assembly has a proximal-most end and a distal end, wherein the cam rotates from the small radius side to the large radius side of the cam, which contacts the proximal-most end of the cam pusher assembly to linearly translate the cam pusher assembly along a length of the apparatus.

15. The apparatus of claim 14, wherein the flexible shaft assembly comprises a slotted tube.

16. The apparatus of claim 15, wherein the flexible shaft assembly includes a key component located on an outer surface of the slotted tube.

17. The apparatus of claim 14, wherein when the lever is positioned against the handle, the compression spring pushes the band retention element and cam pusher assembly against the drill cam.

18. The apparatus of claim 14, wherein the lever is configured to pivot the drill cam to push the cam pusher assembly and band retention element against the compression spring when the lever is moved from a first position next to the handle to a second position away from the handle.