Locking type artificial femoral stem

Abstract

The invention relates to a locking type artificial femoral stem, and belongs to the technical field of human body implantation materials. The locking type artificial femoral stem is composed of a femoral stem body and a neck part. The neck part is made to be at the upper end of the femoral stem body. The front side, the rear side, the inner side and the outer side of the femoral stem body are provided with a front side locking screw hole, a rear side locking screw hole, an inner side locking screw hole, an outer side locking screw hole and a transverse screw hole. The locking screw holes are all the semi-circular or circular screw holes or the semi-circular and circular combining screw holes. When the locking type artificial femoral stem is implanted into a femoral medullary cavity along a pre-set track, locking screws pass through the screw holes formed in the femoral stem body, and the locking type artificial femoral stem is locked at the close end of a femur, firm fixing of the artificial femoral stem and the femur can be achieved, the length of the artificial femoral stem cannot be too long, bone mass can be maintained more, the trauma, bleeding and the difficulty of the revision in the later period during operating can be lowered, the operating accuracy during the operating is increased, the fat embolism is lowered, and the risk of femur facture in the artificial femoral implanting process is lowered.

Description

technical field [0001] The invention relates to a locking type artificial femoral stem, which belongs to the technical field of implants in human body. Background technique [0002] Artificial total hip / half hip replacement has been widely used in the treatment of elderly femoral neck fractures, avascular necrosis of the femoral head and other diseases; as an important link in this type of surgery, the artificial femoral stem and the femur are firmly fixed. And reduce the risk of loosening and subsidence of the artificial femoral stem in the later stage as much as possible. With the increasing clinical application, many complications caused by artificial femoral stem implantation have been observed clinically, such as stem loosening caused by poor stability after implantation of the femoral stem; Femoral fracture or fat embolism caused by excessive hammering force due to fixation effect; poor matching between the handle and the medullary cavity, resulting in difficulty in p...

AI Technical Summary

Problems solved by technology

With the increasing clinical application, many complications caused by artificial femoral stem implantation have been observed clinically, such as stem loosening caused by poor stability after implantation of the femoral stem; Femoral fracture or fat embolism caused by excessive hammering force due to fixation effect; poor matching between the handle and the medullary cavity, resulting in difficulty in placement; during the forced implantation of the handle, the predetermined trajectory was changed, resulting in an unsatisfactory position of the prosthesis; The distal end of the handle deviates from the center of the medullary cavity and bears against one side of the cortex bone, resulting in postoperative thigh pain; the design of the handle is too long to achieve the "three-point fixation" of the proximal, middle, and distal ends of the handle, resulting in excessive Multiple and repeated reaming increases intraoperative trauma, bleeding, and fat embolism, and there are also difficulties in later revision due to too long stems, excessive trauma, and more blood loss during revision operations; although some prostheses have been dissected type design, but the shape of the human femoral medullary cavity is complex and diverse, and simply using several types of anatomical prostheses cannot achieve a good match with various medullary cavity shapes, so that the clinical application of this type of prosthesis has not been achieved. considerable advantage

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