Bone preparation instruments and methods
First Claim
Patent Images
1. A bone cutting instrument comprising:
- a proximal end and a distal end spaced apart along a longitudinal axis of the instrument;
first and second cutting edges at the distal end, the first and second cutting edges being diametrically opposed; and
third and fourth cutting edges at the distal end, the third and fourth cutting edges being diametrically opposed and adjacent the first and second cutting edges;
wherein the first, second, third, and fourth cutting edges define an interior void, and the first and second cutting edges extend distally beyond the third and fourth cutting edge.
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Accused Products
Abstract
Instruments and methods for preparing adjacent bones for fusion, and for inserting implants are disclosed. In one embodiment, the instruments include paddles for spacing the adjacent bones a predetermined distance and a cutting edge to create a channel between the adjacent bones to receive a fusion implant. In another embodiment, the instruments include a bone cutting instrument, a rasp, and an implant inserting tool. The instruments and methods are particularly advantageous for preparing a spinal fusion implant site.
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Citations
35 Claims
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1. A bone cutting instrument comprising:
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a proximal end and a distal end spaced apart along a longitudinal axis of the instrument;
first and second cutting edges at the distal end, the first and second cutting edges being diametrically opposed; and
third and fourth cutting edges at the distal end, the third and fourth cutting edges being diametrically opposed and adjacent the first and second cutting edges;
wherein the first, second, third, and fourth cutting edges define an interior void, and the first and second cutting edges extend distally beyond the third and fourth cutting edge. - View Dependent Claims (2, 3, 4, 5)
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6. A rasp adapted to define a recess between first and second bone surfaces for receiving an implant, said rasp comprising:
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a shaft having a proximal end and a distal end spaced apart along a longitudinal axis of the shaft; and
a rasp head at the distal end of the shaft, the rasp head having an arcuate distal surface and first and second transverse surfaces adjacent the distal surface and substantially perpendicular to the longitudinal axis, wherein at least one transverse face is roughened. - View Dependent Claims (7, 8, 9, 10, 11, 13, 14, 15, 16, 18, 19, 20, 21, 22, 23, 27, 28, 29, 30, 31, 32)
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12. A kit for preparing a channel between adjacent first and second bone surfaces comprising:
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(a) a bone cutting instrument comprising;
(i) a shaft with proximal and distal ends spaced apart along a longitudinal axis of the shaft, the shaft comprising an elongated opening at the proximal end, substantially perpendicular to the longitudinal axis, the shaft further comprising a hollow bore extending from the proximal end to the distal end;
(ii) first and second cutting edges at the distal end, the first and second cutting edges being diametrically opposed;
(iii) third and fourth cutting edges at the distal end, the third and fourth cutting edges being diametrically opposed and adjacent the first and second cutting edges;
wherein the first, second, third, and fourth cutting edges define an interior void, and the first and second cutting edges extend distally beyond the third and fourth cutting edge; and
(b) a rasp adapted to define a recess between first and second bone surfaces for receiving an implant, said rasp comprising;
(i) a shaft having a proximal end and a distal end spaced apart along a longitudinal axis of the shaft;
(ii) a rasp head at the distal end of the shaft, the rasp head having an arcuate distal surface and first and second transverse surfaces adjacent the distal surface and substantially perpendicular to the longitudinal axis, wherein at least one transverse face is roughened; and
(iii) an opening for receiving a portion of an alignment pin through the proximal end and substantially perpendicular to the longitudinal axis of the shaft;
wherein the rasp is slidably received into the hollow bore of the bone cutting instrument.
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17. A method for preparing a channel between adjacent first and second bone surfaces, wherein the first and second bone surfaces are separated by a space, the method comprising:
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(a) inserting at least one distractor between the adjacent first and second bone surfaces to space the bone surfaces apart a predetermined distance, the distractor providing an exposure window;
(b) passing a rasp through the exposure window and into the space between the first and second bones;
(c) passing a hollow bone cutting instrument through the exposure window and over the rasp to cut a channel between the first and second bone surfaces; and
(d) aligning the rasp and bone cutting instrument.
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24. An implant inserting tool comprising:
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a handle;
a shaft having a proximal end and a distal end, the proximal end releasably coupled to the handle;
a pair of arms integrally formed on the distal end of the shaft, each of the arms movable between a spaced apart implant holding position and a compressed implant releasing position, wherein distal portions of the arms are shaped to fit inside an implant; and
a hollow sleeve slidably mounted on the shaft, the sleeve slidable from a first proximal position to a second distal position along the shaft, the sleeve forcing the arms together to release the implant when the sleeve is in the distal position.
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25. The method of claim 44 wherein the sleeve is internally threaded to match external threading on the shaft, and the sleeve is rotated distally on the shaft.
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26. A method for preparing a channel between opposing bone surfaces, the method comprising a step of:
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selecting a channeling device, the device comprising;
a. a proximal end and a distal end spaced apart along a longitudinal axis of the device;
b. a pair of diametrically opposed paddles fixed in a spaced apart relationship and having a cutting edge between said diametrically opposed paddles, the diametrically opposed paddles extending distally beyond the cutting edge;
advancing the diametrically opposed paddles between the opposing bone surfaces to distract the bone surfaces to a desired distance apart; and
continuing advancing the paddles between the opposing bone surfaces until the cutting edge cuts a notch in the opposing bone surfaces, the notches in the opposing bone surfaces forming a first channel.
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33. A kit for fusing an intervertebral disc space between a first and second vertebrae, kit comprising:
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(a) an implant body comprising a support component having a “
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shape comprising a first arm continuous with a second arm and having a gap therebetween, and a growth component receivable within the gap; and
(b) an implant insertion tool, wherein the insertion tool comprises (i) a shaft having a proximal end and a distal end;
(ii) a pair of arms integrally formed with the distal end of the shaft, each of the arms movable between a spaced apart holding position and releasing position, wherein distal ends of the arms are shaped to fit inside an implant;
(iii) a sleeve operable on the arms to force the arms together towards the releasing position, the sleeve comprising a hollow sleeve slidably mountable on the shaft, the sleeve slidable from a first position adjacent the handle to a second engaging position located between the first position and the distal ends of the arms, the sleeve forcing the arms together to release the implant when the sleeve is in the engaging position. - View Dependent Claims (34, 35)
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Specification