Instrument kit and procedure for performing posterior lumbar interbody fusion
First Claim
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1. An instrument for cutting a groove in the lower edge of an upper vertebral body to be fused to a lower vertebral body comprising:
- a. a shaft adapted to be inserted into the intervertebral space, the shaft having a back portion with a channel formed therein;
b. retaining means carried by the shaft; and
c. a chisel adapted to be slidably received within the channel in the shaft and held therein by the retaining means.
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Abstract
Instrument kit and method for performing posterior lumbar interbody fusion. The surgical procedure is done through the spinal canal rather than outside the spinal canal as has been done previously. The posterior lumbar interbody fusion procedure is faster, simpler, less bloody and less expensive than prior art vertebrae fusion procedures. The surgical procedure of this invention is carried out using a novel instrument kit comprising first and second shafts, first and second chisels, a retaining ring with set screw, an extraction hammer, a tamper, and a hook.
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Citations
18 Claims
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1. An instrument for cutting a groove in the lower edge of an upper vertebral body to be fused to a lower vertebral body comprising:
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a. a shaft adapted to be inserted into the intervertebral space, the shaft having a back portion with a channel formed therein; b. retaining means carried by the shaft; and c. a chisel adapted to be slidably received within the channel in the shaft and held therein by the retaining means. - View Dependent Claims (2, 3, 4)
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5. An instrument for cutting a groove in the upper edge of a lower vertebral body to be fused to an upper vertebral body having a groove already cut in the lower edge thereof comprising:
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a. a shaft adapted to be inserted into the intervertebral space, the shaft having a top surface portion provided with an extension adapted to fit snugly into the groove in the lower edge of the upper vertebral body, and said shaft further having a back portion provided with a channel formed therein; b. retaining means carried by the shaft; and c. a chisel adapted to be slidably received within the channel in the shaft and held therein by the retaining means. - View Dependent Claims (6, 7, 8)
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9. A method for performing a posterior lumbar interbody fusion comprising the steps of:
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a. removing lamina from the two vertebrae to be fused; b. cleaning and shaping the lamina for subsequent use as bone grafts; c. removing degenerative disk material from between the vertebrae to be fused; d. cutting a groove into the lower edge of the upper vertebral body to be fused; e. cutting a groove into the upper edge of the lower vertical body to be fused, the groove being in line with the groove in the upper vertebral body, and f. wedging a bone graft into the grooves to thereby fuse the upper and lower vertebrae. - View Dependent Claims (10, 11, 12, 13)
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- 14. An instrument kit for performing posterior lumbar interbody fusions comprising a first shaft adapted to be inserted into the intervertebral space, the first shaft having a channel means formed therein, a first chisel adapted to be telescopically slidably received within the channel means, shoulder means on the first chisel for limiting the slidable reception of the first chisel within the channel means in the first shaft, means for retaining the first chisel within the channel means in the first shaft, the first shaft having a protuberance thereon for preventing the first shaft from slipping through the intervertebral space, wherein the first chisel is used to cut a small groove into the cartilagineous and osseous part of the lower edge of the upper vertebral body, and wherein the first chisel is thereafter removed from the first shaft, a second chisel thereafter adapted to be telescopically slidably received within the channel means in the first shaft and retained therein, and the second chisel having shoulder means thereon for limiting the distance the second chisel may be slidably received within the respective channel means in the first shaft, wherein the second chisel is used to deepen the groove, thereby assuring osseous contact between the vertebrae and subsequent bone grafts.
Specification