External fixing device of pelvis at lateral position in artificial hip-joint replacement and working method thereof

Abstract

The invention relates to an external fixing device of the pelvis at the lateral position in artificial hip-joint replacement, comprising a flat plate, a sliding plate, an operating arm, a sacrum fixing plate, an operating bed connecting and fixing piece, an anterior superior iliac spine fixing piece, a guide needle, a universal rotating shaft, a universal shaft seat and a fixed piece. A working method of the external fixing device of the pelvis at the lateral position in the artificial hip-joint replacement comprises the following detailed steps: (1) the device is fixed with the operating bed to lead a human body to be in the lateral position; (2) the sliding plate is adjusted to drive the anterior superior iliac spine fixing piece; (3) the anterior superior iliac spine fixing piece is adjusted; (4) a vertical needle body is parallel to the connecting line of the anterior superior iliac spines at the two sides, an inclined needle body expands outwards by 45 degrees, and inclines forwards by 15-20 degrees; and (5) an acetabulum placer is parallel to the inclined needle body. The external fixing device has the advantages that (1) the angle design of the inclined needle body in the two-in-one guide needle ensures the accuracy of the operation; (2) the accuracy, the firmness and the reliability of the pelvis fixing are ensured; (3) the operation is convenient; and (4) the wound is avoided.

Description

(1) Technical field: [0001] The invention relates to an orthopedic operation device, in particular to a lateral pelvic external fixation device in artificial hip joint replacement and a working method thereof. (two) background technology: [0002] With the maturity and popularization of artificial hip replacement technology, hospitals of different levels and levels in my country have successively carried out artificial hip replacement, and a series of problems have also emerged, most of which are in the placement of the acetabulum. The reasons are, firstly, the lack of technical level and surgical experience of the surgeon; secondly, in the lateral position hip replacement, there is a lack of clear and referable anatomical landmarks, which makes it difficult for the surgeon to determine the prosthesis during the operation. the correct position. According to the surgical specification, the acetabular prosthesis requires 45° abduction relative to the sagittal plane and 15°-20...

AI Technical Summary

Problems solved by technology

In the preoperative preparation process, the exact fixation of the pelvis and the positioning of the guide pin are the necessary conditions for accurate installation of the acetabular prosthesis, but the current fixation of the pelvis usually fixes the sacrum and pubic symphysis, which makes it difficult to ensure the firmness and reliability of pelvic fixation , and cannot correct or accurately judge the inclination of the pelvis, including the inclination of the sagittal plane and the coronal plane, so the abduction and anteversion guide pins on the acetabular implant cannot meet the preoperative accurate requirements (see image 3 )

Especially after the surgical drape is placed, it is difficult to determine the original position of the pelvis simply through the limited surgical field of view. This is also a problem that orthopedic surgeons often encounter and difficult to solve in lateral hip surgery.

Although surgical navigation or 3D surgical simulation systems can reduce errors, the operation is cumbersome and many primary hospitals do not have the conditions to purchase expensive navigation systems

At present, there are many lateral pelvic external fixators abroad. Although some problems have been solved, there is no conclusive evidence to prove its accuracy.

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