Gap-balancing-method knee-joint-replacement femur size measuring mold

Abstract

The invention discloses a gap-balancing-method knee-joint-replacement femur size measuring mold. Both a sliding sleeve and a small-column positioning block can slide on a body, and the back side of the sliding sleeve is connected with an upper foot plate in a pendulum-type hanging manner; during a knee extending position, the upper foot plate and a lower foot plate are inserted into spaces completing osteotomy of the proximal tibia and the distal femur and opened, and the size of a prosthesis gasket can be measured through a sliding-cover small window; meanwhile, the sliding sleeve abuts against the small-column positioning block at the upper portion, and slides upwards, and the relationship between the lower foot plate and the small-column positioning block is locked through a hook, a clamping pin and a spring. During a knee bending position, the sliding sleeve falls down, the upper foot plate and the lower foot plate are closed, and are inserted into spaces of the proximal tibia andthe posterior femoral condyle, the upper foot plate and the lower foot plate are opened again, it can be achieved that an medial collateral ligament, a lateral collateral ligament and the like are opened through tension before knee-bending-position osteotomy, drilling is conducted according to positioning holes formed in the two ends of the small-column positioning block, the positioning holes canserve as positioning holes for placing a four-in-one osteotomy module, and the size of a femur prosthesis can be measured through scale identifications of a pointer column inserted into the upper portion of the small-column positioning block at this moment.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a femur size measuring mold for knee joint replacement using a gap balance method. Background technique [0002] Almost all femur size measurement modules for knee replacement at home and abroad are made based on the theory of equal osteotomy. When integrating the osteotomy module, it is completed according to the posterior condyle reference and empirical external rotation of 3 degrees. [0003] The existing size measuring module can achieve the required accuracy for measuring the appropriate size of the prosthesis, but relying on this mold to make the positioning hole of the four-in-one osteotomy module, it is possible to cut a suitable knee extension and flexion gap, and a suitable internal and external prosthesis. Rotation cannot be done precisely, especially for knees with varus deformity, knee flexion deformity, and posterior condylar dysplasia, which often requires rich surg...

AI Technical Summary

Problems solved by technology

[0003] The existing size measuring module can achieve the required accuracy for measuring the appropriate size of the prosthesis, but relying on this mold to make the positioning hole of the four-in-one osteotomy module, it is possible to cut a suitable knee extension and flexion gap, and a suitable internal and external prosthesis. Rotation cannot be done accurately, especially for knees with varus deformity, knee flexion deformity, and posterior condylar dysplasia, which often requires rich surgical experience of the operator

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