Tibial plateau prosthesis extractor

Abstract

The invention discloses a tibial plateau prosthesis extractor, which includes a forceps head, a handle, a push rod, a guide rod and a scraper knife. The forceps head includes two forceps arms which are symmetrically arranged in a crossed manner; the crossed part of the two forceps arms is hinged; one end of each clamp arm is provided with a clamping part and the other end is provided with a connecting part; a guide groove is formed in one side of the forceps head, and the guide groove is formed close to the connecting part; the handle comprises two handle bodies, and one end of each handle body is connected with the two connecting parts respectively; two ends of the push rod are respectively supported on the two handle bodies; the guide rod is perpendicular to the push rod, and one end ofthe guide rod is rotationally connected with the push rod; one end of the scraper knife is rotationally connected with the other end of the guide rod, and the other end of the scraper knife is provided with a cutting edge; the scraper knife can movably penetrate through the guide groove, and the cutting edge end of the scraper knife extends to the crossed part of the two forceps arms; the two handle bodies are close to each other or far away from each other to drive clamping parts to be closed or opened; the handles can rotate relative to the forceps heads to push the cutting edge end to be close to or away from the clamping parts.

Description

technical field [0001] The invention belongs to the technical field of tibial plateau prosthesis extraction, in particular to a tibial plateau prosthesis extractor. Background technique [0002] After the primary knee replacement, the knee joint needs to be revised due to prosthetic loosening, osteolysis, infection, etc., and surgical instruments are used to remove the primary prosthesis from the patient. Traditional tibial plateau prosthesis removal instruments are mostly osteotome, osteotome and electric saw. Remove the tibial plateau prosthesis from the tibia with a spatula, saw, etc. [0003] Bone knives, chisels, and chainsaws cannot control the direction of the force well during use. [0004] The principle of bone knife and chisel is to embed the head of the knife or chisel into the interface between the tibial plateau prosthesis and bone by bearing the percussion force. Osteotomy and chisel cannot be accurately embedded in the interface between the tibial plateau p...

AI Technical Summary

Problems solved by technology

[0003] Bone knives, chisels, and chainsaws cannot control the direction of the force well when they are in use

[0004] The principle of bone knife and chisel is to embed the head of the knife or chisel into the interface between the tibial plateau prosthesis and bone by bearing the percussion force. Osteotomy and chisel cannot be accurately embedded in the interface between the tibial plateau prosthesis and bone, and will cause the tibial plateau prosthesis to take away a large amount of bone mass and even cause serious bone defects

[0005] When the electric saw cuts the interface between the tibial plateau prosthesis and the bone, although the cutting force can be guaranteed to be uniform, but because there is no guiding mechanism, the electric saw cannot cut the interface along a constant direction, and sometimes even cut off the parts that do not need to be removed. bone

Images