CN103908319B - Medical wedge-shaped osteotomy clipper for cancellous bones under basibranchial bones - Google Patents

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

Medical Subchondral Cancellous Bone Wedge Osteotomy Cutter

technical field

The invention relates to a medical device, in particular to a wedge-shaped osteotomy cutter for subchondral cancellous bone.

Background technique

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 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, not 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.

Contents of the invention

The purpose of the present invention is just to overcome above-mentioned defect, develops a kind of medical subchondral cancellous bone wedge-shaped osteotomy cutter

Technical scheme of the present invention is:

Medical subchondral cancellous bone wedge-shaped osteotomy cutter, the intersection of two cutting arms is connected by joint rotation, each cutting arm is a long arm at the back of the joint, and a short arm at the front of the joint, its main technical features are: The front end of the short arm of each shearing arm is connected to the bayonet, and the front end of the bayonet is connected to the shearing head. Multiple blades are arranged on the cutting head. The long arm of one shearing arm is connected to a screw, and the other end of the screw passes through the other Cut the long arm of the arm and attach the nut on the threaded rod that goes through the section.

The plurality of blades arranged on the two shearing heads are staggered when engaged.

A plurality of cutting edges are arranged on the outer circular arc of the shearing head, and the cutting edges are wedge-shaped.

There is a groove at the rear of the shearing head, and there is a protruding bayonet reed on the connecting bayonet, and the groove matches the bayonet reed.

The advantages and effects of the present invention are as follows: 1. The wedge-shaped osteotomy of subchondral cancellous bone can be completed immediately with one cut, greatly improving the cutting efficiency and shortening the operation time. 2. The corresponding shearing head can be selected according to the curvature of the donor cartilage. 3. The cutter head with the corresponding blade angle can be selected according to the cartilage radian that needs to be formed. 4. The cutter head has a groove, and the clip of the cutter has a protruding reed, which can be directly inserted and pulled out, which is convenient for quick replacement of the cutter head. 5. The use of this invention can keep the shape of each osteotomy consistent and has a very high repeatability. 6. Since the shearing force is realized by tightening the pressurized nut on the long shearing arm, it has the dual power amplification effect of the lever and the threaded rod, which can shear hard bone tissue; at the same time, the shearing force is slowed down during the shearing process , Uniform release, and the shearing range can be fine-tuned, which can avoid the difficulty of cutting cancellous bone caused by too much force caused by direct hand-held shearing or insufficient force. 7. The osteotomy shear is an all-metal structure, which can be repeatedly sterilized and reused. 8. Cooperating with the recipient cancellous bone graft bed shaper, the shape of the subchondral cancellous bone of the graft donor after osteotomy can be completely matched with the recipient cancellous bone bed, so that the transplant donor and the recipient can be completely matched, and the bone is easy to maintain. heal.

Description of drawings

Fig. 1 - schematic diagram of the structure principle of the present invention.

Figure 2—A top view of Figure 1.

The corresponding parts of each label in the figure are as follows:

Shearing arm 1, joint 2, connecting bayonet 3, shearing head 4, wedge-shaped blade 5, bayonet reed 6, screw rod 7, pressure nut 8, screw rod joint 9.

detailed description

As shown in Figure 1 and 2:

The wedge-shaped osteotomy cutter for subchondral cancellous bone is made of all-metal material, and has a scissors-like structure as a whole.

The two shearing arms 1 are in the shape of long rods, and are bent and crossed to be connected by a joint 2. The joint 2 divides the shearing arm 1 into a short arm and a long arm, and the long arm is a hand-held part. The end of the short arm is a connection bayonet 3, and the connection bayonet 3 is connected with the shearing head 4, and the shearing head 4 has a plurality of wedge-shaped (triangular) blades 5 arranged in an arc. The connecting bayonet 3 can be connected with various types of shearing heads 4 with different radians. There is a groove at the rear of the shearing head 4, and there is a protruding bayonet reed 6 on the connecting bayonet 3. When the connecting bayonet 3 is inserted into the shearing head 4, the bayonet reed 6 is deformed and then pops up. There is a groove fixed on the rear portion of the shearing head 4 to make the shearing head 4 stable. There are two shearing heads 4, which are installed on the connecting buckles 3 of the two shearing arms 1 respectively. The wedge-shaped blades 5 on the two shearing heads 4 are arranged at intervals, and the wedge-shaped blades 5 are distributed on the shearing heads. On the outer edge of 4, that is, on the outer arc edge, the shearing cutter head 4 is in a state of coupled paired wedge-shaped blades 5 in the shearing state, and a plurality of wedge-shaped blades 5 arranged on the two shearing cutter heads 4 are engaged with each other. stagger. There is a long screw rod 7 on the long arm of a shearing arm 1, and the screw rod 7 passes through the hole on the corresponding position on the long arm of another shearing arm 1 and is connected with the screw joint 9 on the long arm of a shearing arm 1 , There is a pressure nut 8 screwed on the screw rod 7 at the other end of the screw rod 7 .

Description of the application process of the present invention:

Comparing the obtained donor graft with subchondral cancellous bone with different types of shearing blades 4, a pair of shearing blades 4 that are similar to the radian of the cartilage surface and have a suitable blade angle are selected. Insert the connecting bayonet 3 into the shearing head 4, at this time the bayonet reed 6 deforms, then pops up, and is fixed in the groove at the rear of the shearing head 4, so that the shearing head 4 is stable. If it is not suitable, the cutting head 4 can be pulled out to replace other models, so that the cutting head can be replaced quickly until it meets the requirements. Rotate the pressure nut 8 counterclockwise, so that the pressure nut 8 moves to the end along the screw rod 7, and then the hand-held part of the shear arm 1 can be released (separated). At this time, since the joint 2 serves as a fulcrum, the The short arm also separates simultaneously, and the two shearing cutter heads 4 also separate accordingly. The donor graft with subchondral cancellous bone is placed between the two shearing blades 4, with the cutting edge 5 aligned with the junction of the graft's cartilage and cancellous bone. At this time, the hand-held parts of the two shearing arms 1 are closed with one hand, and the other hand rotates the pressurizing nut 8 clockwise to move the pressurizing nut 8 along the screw rod 7 to the proximal end. With a slow shearing action, part of the cancellous bone of the donor graft with subchondral cancellous bone will be resected, and the remaining part will be formed into a wedge-shaped arrangement, and the same matching model of recipient subchondral cancellous bone wedge-shaped osteotomy will be used The shaper can completely couple the shape of the subchondral cancellous bone of the transplanted donor with the cancellous bone bed of the recipient after osteotomy, so that the cancellous bone of the transplanted cartilage donor can completely match the cancellous bone bed of the recipient, with the largest contact surface Heals, prone to rapid bony healing. Since the shearing force is realized by tightening the pressurized nut 8 on the long shearing arm, it has the dual power amplification effect of the lever and the threaded rod, which can shear hard bone tissue; meanwhile, the shearing force is slow and smooth during the shearing process. It releases evenly, and the shearing range can be fine-tuned, which can avoid cutting difficulties caused by cancellous bone fragmentation or insufficient force caused by direct hand-held shearing.

Claims (1)

1. spongy bone wedge osteotomy clipper under medical cartilage, two shear arm infalls are connected by articulation, often Individual shear arm behind joint one section be long-armed, be galianconism it is characterised in that each shearing in joint the last period The galianconism front end connects bayonet socket of arm, bayonet socket front end connects shearing cutter head, and the external arc side of shearing cutter head is arranged Arrange multiple blades, multiple blades are wedge shape, the long-armed upper connecting screw rod of a shear arm, and the screw rod other end is worn Cross the long-armed of another shear arm and on the screw rod through part attaching nut, the rear portion of shearing cutter head has recessed Groove, connects bayonet socket has the bayonet socket reed of a projection, and groove is mated with bayonet socket reed.