Dilator in total knee arthroplasty

Abstract

The invention discloses a dilator in the total knee arthroplasty, and belongs to the field of medical instruments. By means of the dilator, balance between soft tissues on the inner side and the outer side of the knee joint can be measured. The dilator comprises a pincer-shaped body and a dilating end. The dilating end is arranged at the far end of the pincer-shaped body and comprises a thigh-bone-side part and a tibia-side part. The thigh-bone-side part comprises a U-shaped dilating plate and a bearing-type device. The U-shaped dilating plate is divided into the inner side and the outer side which correspond to the medial malleolus and the lateral malleolus at the far end of the thigh bone after bone cutting in the TKA. The bearing-type device is arranged at the root of the U-shaped dilating plate and provided with scale marks which correspond to the thigh-bone outward-rotation angle of a trapezoid gap during prosthesis buckling. The inner side and the outer side of the U-shaped dilating plate can rotate around the bearing-type device. The tibia-side part is a rectangular dilating plate similar to the cross section of the tibial plateau in shape. The dilator is simple in structure and low in cost, the two-side intervals on the thigh-bone side and the tibia side can be compared at the same time, balance between the inner side and the outer side of the knee joint in the TKA is guaranteed, and convenience is brought to clinic popularization.

Description

technical field [0001] The invention belongs to the field of medical devices, and in particular relates to a distractor in artificial total knee replacement. Background technique [0002] Total knee arthroplasty (Total Knee Arthroplasty, TKA) has become one of the surgical treatments for advanced degenerative osteoarthritis, rheumatoid arthritis, ankylosing spondylitis and other diseases. Since prolonged immobilization time and muscle exercises after surgery cannot correct soft tissue imbalances, the balance of soft tissues depends entirely on the surgery itself. Therefore, soft tissue balance is an extremely critical step in total knee arthroplasty. In total knee arthroplasty, the internal and external balance of the knee joint mainly depends on the experience of the chief surgeon to evaluate with both hands, and suitable and effective auxiliary tools are an important guarantee for the operation. [0003] Ordinary spreaders only work on one side, and their main function i...

AI Technical Summary

Problems solved by technology

[0003] Ordinary spreaders only work on one side, the main function is to expose the surgical area, which is convenient for the surgeon to operate, but it is impossible to compare the distance between the two sides at the same time

However, advanced tools, such as distance testers with pressure test parts, are expensive and not easy to promote clinically.

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