Medical Subchondral Cancellous Bone Wedge Osteotomy Cutter

Abstract

The invention relates to a medical wedge-shaped osteotomy cutter for subchondral cancellous bone. The structure of the present invention is that the intersection of the two shearing arms is connected by a joint. Each shearing arm is a long arm at the rear of the joint, and a short arm at the front of the joint. The front end of the short arm of each shearing arm is connected with a bayonet. The front end of the bayonet is connected to the shear head, and multiple blades are arranged on the shear head. The long arm of one shear arm is connected to a screw, and the other end of the screw passes through the long arm of the other shear arm and passes through the part of the screw. Attach the nut. The present invention overcomes the unevenness and randomness of the osteotomy surface manually trimmed by bone knives and chisels in the past, and the mismatch between the donor osteotomy surface and the recipient osteotomy surface will cause postoperative rejection, which is not conducive to osteotomy. Healing and other defects. The invention improves the shearing efficiency, shortens the operation time, keeps the shape of each osteotomy consistent, releases the shearing force slowly and uniformly, can be used repeatedly, makes the transplant donor and the recipient completely match, and facilitates bone healing.

Description

technical field [0001] The invention relates to a medical device, in particular to a wedge-shaped osteotomy cutter for subchondral cancellous bone. Background technique [0002] Before the present invention was made, when large blocks of allogeneic cartilage were transplanted, the trimming of the subchondral cancellous bone of the donor was manual operation, using simple tools such as osteotome and osteotome. The osteotomy surface trimmed by hand is uneven and random, which leads to the inconsistent shape of each osteotomy surface, and it is easy to make the donor osteotomy surface mismatch with the recipient osteotomy surface. Due to the manual osteotomy, more subchondral cancellous bone needs to be reserved for fixation, resulting in more cancellous bone components of the allograft, which is one of the important factors causing postoperative rejection. In addition, the traditional manual osteotomy is a single-plane osteotomy, and both the donor subchondral cancellous bone...

AI Technical Summary

Problems solved by technology

In addition, the traditional manual osteotomy is a single-plane osteotomy, and both the donor subchondral cancellous bone and the recipient cancellous bone bed are flat, so the contact area between the donor and the recipient is small, and the bone healing time of crawling replacement is slow. Longer, less conducive to bone healing

The traditional single-plane osteotomy of subchondral cancellous bone cannot change the original curvature of the cartilage, cannot completely match the recipient, and cannot achieve the purpose of completely repairing the recipient's articular surface cartilage

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