Patella fracture internal fixation device

Abstract

The invention discloses a patella fracture internal fixation device. The patella fracture internal fixation device comprises a knee holding ring, patella nails, adjusting rope belts and an adjusting mechanism, wherein the edge of the knee holding ring is connected with the adjusting rope belts and/or fixing rope belts, the tail ends of the adjusting rope belts and/or fixing rope belts are fixedlyarranged at two ends of the corresponding patella nails in a sleeving manner, and the lengths of the two ends or the middle of the adjusting rope belts can be adjusted, so that each fixing rope belt and each adjusting rope belt are tensioned. The rope belts can be adjusted in the radial direction and can also rotate moderately along the knee holding ring, thus, the rope belts are suitable for selection of arrangement of nails at different positions, the constraint problems of the lengths of the rope belts and the hole positions at the ends of the belts do not need to be considered during nailarrangement, the optimal position can be found for nail arrangement, a positioning instrument is not needed, and only the rope belts need to be operated for tensioning adjustment after nail arrangement; and the operation process is simple and efficient.

Description

technical field [0001] The invention belongs to the technical field of internal fixation instruments for patella fractures. Background technique [0002] The patella is the largest sesamoid bone in the human body. It is located in front of the lower end of the femur, in the quadriceps tendon. Patellar fractures account for 1% to 2% of all fractures and are often caused by a primary rupture of the quadriceps muscle bond or by direct impingement on the femur. The patella has the function of protecting the knee joint and preventing the quadriceps tendon from rubbing against the cartilage surface of the femoral condyle. Patellar fracture is a relatively common injury. Improper treatment of patellar fracture may lead to complications such as fracture nonunion, joint adhesion, traumatic arthritis, and bone infection. There are usually many methods for internal fixation of patellar fractures. The clinical methods of treating patellar fractures can be divided into two categories: ...

AI Technical Summary

Problems solved by technology

Part of the prior art adopts the outer side of the knee tuck circle to fix the rope, which is actually an external fixation part that will tie the rope to the knee backing plate, such as the publication number of CN23075272Y "centripetal expansion type patella reset balloon", published No.: CN2840957Y "patella fracture fixation frame", CN 201968880 U utility model "patella fracture fixation device", publication number is: CN 104644305 A "a kind of patella fracture fixation device", etc., these external fixation parts, not directly It is fixed on the patella, and the fractured patella cannot be substantially fixed, and the fixation tension is concentrated on the front of the patella, while there is no traction on the back of the patella, which may easily cause the back crease to open, resulting in aliasing and slow recovery of the patella

[0003] In the fixation after incision of the patella fracture site, such as Kirschner wire tension fixation, memory alloy polypatella fixation patella claw and tension band, etc., the common problem is that a large incision is required to place the fixation during the operation. , but also requires a second operation to remove the fixation

The disadvantages of patellar claw fixation are: high cost, which increases the burden on patients; it is necessary to accurately grasp the size of the patellar claw, otherwise it is easy to be too large or too small, resulting in the patellar claw and patella not being applied; It is isolated from the patella, the volume increases, and the skin tension of the patella is too large, which is not conducive to suturing, and it is easy to cause skin necrosis of the patella, and the patellar claws are exposed; the effect is better for transverse fractures, but the fixation effect for complex comminuted fractures and fractures of the lower pole of the patella It is not reliable, often with the help of Kirschner wire fixation, and the scope of use becomes smaller. Instead of using Kirschner wire plus patellar claws, it is better to simply apply Kirschner wire tension band fixation, which makes the operation redundant; because of concerns about the firmness of the fixation, so Early functional exercise is limited; not a universally available fix

Affect blood circulation, delay recovery time, and even cause local tissue necrosis, often irritating and causing discomfort to patients

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