Impulsive percussion instruments for endplate preparation

Abstract: A hand-held instrument, with a rotary power input to a camshaft, has cam and follower arrangement to provide a reciprocating shaft output. A cutter is provided on the output shaft. In one example, rotating cam percussion is transmitted to the cutter by engaging the cutter with the tissue to be cut, and pushing the instrument forward toward the cutter. In another example, rotating cam percussion is transmitted to the cutter by engaging the cutter with the tissue to be cut, and pulling the instrument back toward the user while maintaining engagement of the cutter with the tissue. In both examples, the cutter remains in idle condition until an axially directed load, forward in the one example, or backward on the other example, is placed on the cutter by moving the instrument forward or backward, respectively, while the camshaft is rotating. A distractor with frame is used to spread and maintain space between vertebral bodies, enabling entrance of the cutter. (end of abstract)

Impulsive percussion instruments for endplate preparation description/claims

Brief Patent Description

Full Patent Description

Patent Application Claims

CROSS REFERENCE TO RELATED APPLICATIONS

The present Application claims foreign priority benefits of European Patent Application Number 03292241.1, filed Sep. 11, 2003, the contents of which are hereby incorporated by reference.

BACKGROUND

This invention relates generally to surgery tools and more particularly to power cutting instruments for vertebral endplate preparation in spinal surgery.

Following removal of some disc materials during spinal surgery, it is important to prepare the endplates of the vertebral bodies for reception of inter-body implant materials. It is desirable to provide devices and procedures for safer, more controlled and more efficient disc space cleaning and endplate preparation. The present invention is directed to providing an additional option for surgeons for improvement in these regards.

SUMMARY

In general, the present invention provides power-operated, hand-held instruments adapted to reception of different types of tissue treatment tools, and drives them in a reciprocating motion.

Further, the invention provides for conversion from a rotary input power source to a reciprocating source, and percussion action in the forward direction in one embodiment, and percussion action in the reverse direction in another embodiment. More specifically, in one embodiment the invention enables use with treatment tools expected to perform more effectively during a forward motion and, in another embodiment, the invention enables use with treatment tools expected to perform more effectively during a reverse motion. Such tools have preferred performance directions, forward or reverse. The invention further comprises treatment tool configurations particularly suitable to the direction and type of cutting action sought. For tools that perform well in either direction, either of the embodiments of the invention may be used. The invention further provides a distractor and keeper arrangement for maintaining distracted disc space height during endplate preparation, the keeper being shaped for convenient use with the powered instruments according to the present invention.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is an elevation view of a percussion instrument according to one embodiment of the present invention.

FIG. 1A is a perspective view of the embodiment shown in FIG. 1 and showing, schematically, an example of an air powered rotary motor and air supply line from a foot pedal operated compressor.

FIG. 2 is a partial section through it taken at line 2-2 in FIG. 1 and viewed in the direction of the arrows.

FIG. 2A is a perspective view of the instrument with a quarter section.

FIG. 2B is an enlarged perspective view of the proximal end portion of FIG. 2.

FIG. 3 is a left-hand end view thereof.

FIG. 4 is an enlarged elevation view of the camshaft thereof.

FIG. 5 is a section taken at line 5-5 in FIG. 4 and viewed in the direction of the arrows and showing a square cam cross-section.

FIG. 6 is an enlarged sectional view of the spring guide and seat member of FIG. 2.

FIG. 7 is an enlarged elevation view of one type of cutter-shaft combination of the embodiment of FIGS. 1 and 2 but on a larger scale, and with a portion broken out to conserve space in the drawing.

FIG. 8 is a section taken at line 8-8 in FIG. 7 and viewed in the direction of the arrows.

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Dynamic distractor
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Industry Class:
Surgery

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