Low-profile peri-locking circular patellar setting fixator

Abstract

The invention relates to a low-profile peri-locking circular patellar setting fixator and belongs to the technical field of orthopedic medical devices. The fixator is used for fixing a patellar fracture. According to the technical scheme, the fixator comprises a circular setting plate and an arc reduction plate; the circular setting plate is composed of a peripheral oblate plate and three middle branch plates; the outer periphery of the circular setting plate matches with the periphery of the patella; the inner face of the circular setting plate matches with the patellar surface in shape; the circular setting plate is provided with a plurality of locking holes; the arc reduction plate is a sector plate; the surface of the arc reduction plate matches with the outer surface of the circular setting plate in radian; the arc reduction plate is rotatably connected with the center of the circular setting plate; the surface of the arc reduction plate is evenly provided with a plurality of tension holes and sliding pressure holes. The fixator allows residual displacements at different positions to be further reduced and allows fracture fragments to be effectively fixed; the fixator has the advantages of simple structure, positioning accuracy, fixation firmness and effect on stabilizing the fracture fragments, surgical and recovery time is greatly shortened, and the pain that a patient feels is effectively relieved.

Description

technical field [0001] The invention relates to a fixation device for patella fracture, belonging to the technical field of orthopedic medical instruments. Background technique [0002] The patella is the largest sesamoid bone in the human skeleton. It is located inside the quadriceps tendon at the front. The bottom edge of the patella is thicker than the tip, and the posterior tip of the patella is relatively rough, connected to the patellar ligament, and the body surface is palpable. The front of the patella protrudes forward in a spherical shape and forms the patellofemoral joint with the cartilage surface between the inner and outer condyles of the femur. The incidence of patella fractures is about 1%, and the treatment of comminuted fractures of the inferior patella is the most difficult. Since the patella is the middle structure of the human body’s knee extensor device, and the knee joint’s activities are relatively complex, patella fractures often require anatomical...

AI Technical Summary

Problems solved by technology

Among them, although the tension band and wire fixation has undergone many improvements, there are still problems such as loosening, unreliable fixation, and local skin irritation; the wire cerclage internal fixation is relatively simple to operate, but the disadvantage is that the front of the fracture fragment will separate when the knee joint is flexed and extended. Displacement, long-term can also cause traumatic arthritis

The current clinical application rate of external fixator fixation is low, and the effect is not exact

For severely comminuted, spalled, and irreparable patella fractures, patella resection is often required, which will affect the functional recovery of the affected limb after surgery.

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