Acetabular prosthesis positioning device and method for unilateral hip joint revision surgery

Abstract

The invention discloses an acetabular prosthesis positioning device and method for unilateral hip joint revision surgery. In the device, a positioning claw is detachably mounted on a holding rod, a lower end of the holding rod is connected with a connector through a cross universal shaft, the connector is detachably connected with an acetabular cup through a mounting head, a horizontal axis of thecross universal shaft is positioned on an adjusting plane of an anteversion angle of the acetabular cup, the connector is rotatably connected with a lower end of an adjusting rod on an extension lineof the horizontal axis, an upper end of the adjusting rod is provided with a first screw rod, the first screw rod penetrates through an angle adjusting plate and is in threaded connection with an anteversion angle fine adjustment knob, and the anteversion angle fine adjustment knob is in clearance fit with the angle adjusting plate through an I-shaped structure; the adjusting rod is assembled with a second screw rod through a connecting piece, the second screw rod extends out of the angle adjusting plate and is in threaded connection with an abduction angle fine adjustment knob, and the abduction angle fine adjustment knob is in clearance fit with the angle adjusting plate through an I-shaped structure. The device and method can accurately and stably position the acetabular prosthesis, accurately adjust the abduction angle and anteversion angle, and have high efficiency and low cost.

Description

technical field [0001] The invention belongs to the technical field of biomedical engineering, and relates to an acetabular prosthesis positioning device and a positioning method for unilateral hip joint revision. Background technique [0002] Biomedical engineering is the comprehensive application of the principles and methods of life science and engineering science. From the perspective of engineering, it understands the structure, function and other life phenomena of the human body at multiple levels in molecules, cells, tissues, organs and even the entire human body system. The general term for artificial materials, products, devices and system technologies for disease treatment, human function assistance and health care; (biological) artificial organs and medical treatment equipment all belong to biomedical engineering. Total hip arthroplasty can relieve hip pain and improve hip joint function. It is currently recognized as a reliable method for the treatment of various...

AI Technical Summary

Problems solved by technology

[0003] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: the bone defect is serious in the revision surgery, and the reference feature of the center of the prosthesis at the lip of the acetabulum is lost, making it difficult to locate the center of the prosthesis , resulting in position deviation of the acetabular prosthesis and too large or too small anteversion and abduction angles during installation. This mechanical instability leads to poor stability of the prosthesis combination, which will lead to the failure of the prosthesis revision surgery

Textbooks and literature clearly point out that the recommended installation angle of the acetabular prosthesis is an abduction angle of about 45° and an anteversion angle of about 15° (the angle between the projection of the line connecting the upper and lower edges of the acetabulum on the coronal plane and the horizontal plane is the abduction angle, The angle between the projection of the anterior and posterior edges of the acetabulum on the horizontal plane and the sagittal plane is the anteversion angle), but in the process of hip revision surgery, the structure of the acetabulum itself, which the surgeon relies on for positioning in the spatial position of the acetabulum, has been If the acetabular prosthesis is damaged, the surgeon can only rely on his own experience and subjective judgment to locate and place the acetabular prosthesis, which is extremely difficult and requires a longer operation time, and cannot meet the requirements for precise positioning of the acetabular prosthesis. The postoperative effect of total hip revision surgery is greatly reduced, and even the operation fails, which brings greater risks to patients and poses greater challenges to doctors' experience and skills

Images