Universal strong femoral stem extractor

Abstract

The invention discloses a universal large-force femoral stem extractor which comprises a first rod piece, a second rod piece, a third rod piece and a fourth rod piece. The first end of the second rod piece serves as a free end, and the second end of the second rod piece is hinged to the middle of the first rod piece; the first end of the third rod piece is hinged to the third end of the second rod piece, and the second end of the third rod piece is a free end; the first end of the fourth rod piece is hinged to the third end of the third rod piece, and the second end of the fourth rod piece is hinged to the second end of the first rod piece; the first end of the fifth rod piece is connected with the second end of the first rod piece; and the locking piece is arranged at the joint of the first rod piece and the fourth rod piece and used for locking the connection state of the first rod piece and the fourth rod piece. The device has the advantages that reliable clamping of the femoral stem can be guaranteed, the taking-out time of the femoral stem is shortened, and the phenomena of fracture around the prosthesis, fracture of the prosthesis and the like are avoided.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a universal type high-strength femoral stem extractor. Background technique [0002] Artificial hip replacement surgery, after 30 years of clinical practice, has become a fully recognized and reliable treatment. However, with the development of society, the indications of total hip replacement have been expanded to elderly and young patients, and the demand for postoperative revision has also increased. Compared with the initial hip replacement, hip revision surgery is more difficult, especially how to efficiently and reliably remove the femoral stem, which has always been a difficult and painful point in the medical field. [0003] Based on this background, a variety of femoral stem prosthesis-assisted extraction tools have appeared on the market, such as: [0004] The Chinese patent discloses a femoral stem extraction device (CN202022439526.3), which has many defects:...

AI Technical Summary

Problems solved by technology

[0004] A Chinese patent discloses a femoral stem removal instrument (CN202022439526.3), which has many defects: ① when clamping the femoral stem, it needs to rotate the tail handle multiple times to achieve clamping, which takes a long time; The implantation direction of the stem prosthesis is not in the same axis. During the removal process, it is easy to cause the prosthesis to break and fracture around the prosthesis;

[0005] A Chinese patent discloses an occlusal type femoral stem extraction instrument assembly (CN201620243007.0), which also has many defects: ① when clamping the femoral stem, it is necessary to rotate and rotate the adjusting head for multiple turns to achieve clamping, which is time-consuming. long; ②The occlusal position is the taper part of the femoral stem prosthesis, and the clamping rod is long and thin. For prostheses with particularly tight fit and small prostheses, the clamping force will be insufficient during the removal process, resulting in femoral stem detachment

[0006] Generally speaking, the femoral stem prosthesis auxiliary extraction tools in the prior art have some defects: These tools usually use the screwing method to complete the clamping of the stem body, resulting in a long time-consuming; and the force direction of these tools is different from that of the femoral stem. The removal direction of the prosthesis is different, which not only complicates the operation, but also easily leads to the fracture of the prosthesis and the fracture around the prosthesis, causing secondary injury to the patient; moreover, the clamping force of these tools is limited, which may lead to the femoral stem fracture during the clamping process. break away

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