Eccentric femoral stem impactor

Abstract

The invention discloses an eccentric femoral stem impactor. The eccentric femoral stem impactor comprises a rubber-coated handle; an impactor handle core is arranged on one side of the rubber-coated handle; an eccentric rod is arranged on the side, away from the impactor handle core, of the rubber-coated handle; a femoral stem butt joint mechanism is arranged on the side, away from the rubber-coated handle, of the eccentric rod; the femoral stem butt joint mechanism comprises a kidney-shaped boss and a guide column; the kidney-shaped boss is located at the end, away from the rubber-coated handle, of the eccentric rod; and the guide column is located at the end, away from the eccentric rod, of the kidney-shaped boss. According to the eccentric femoral stem impactor disclosed by the invention, the position of a femoral stem prosthesis in the femoral marrow cavity can be adjusted, namely the inclination angle of the femoral stem prosthesis is accurately adjusted, so that the femoral stemprosthesis can be accurately placed at a proper position, looseness of the femoral stem prosthesis in an implantation process due to inaccurate position is prevented, and the femoral stem prosthesis is accurately impacted into the marrow cavity and compacted; and meanwhile, the arranged eccentric rod can effectively avoid subcutaneous fat, so that the femoral stem prosthesis is simpler, more convenient and more controllable to install.

Description

technical field [0001] The invention relates to the technical field of medical instruments, in particular to an eccentric femoral stem driver. Background technique [0002] The artificial hip joint in surgical implants has been developed for a long time. When the prosthetic femoral stem is implanted into the human body, a femoral stem driver tool is needed to drive the femoral stem into the prosthesis. In the medullary cavity of the human femur, the femoral stem prosthesis is used to replace the human femur. General medical device companies will be equipped with corresponding femoral stem driver tools when selling femoral stems. However, current femoral stem driver tools have certain drawbacks: [0003] 1. With the improvement of material living standards, obesity has become a global social public health problem. Due to the thick subcutaneous fat in obese patients, it affects the exposure and operation of total hip replacement surgery, and increases the operation time and ...

AI Technical Summary

Problems solved by technology

Due to the thicker subcutaneous fat in obese patients, it affects the exposure and operation of artificial total hip replacement surgery, and increases the operation time and intraoperative blood loss

For obese patients, the conventional femoral stem drive tool is inconvenient to use because it does not take into account the covering of fat, and often requires the operator to hold the femoral stem by hand to install it. It is not conducive to the rapid and smooth operation of the operation;

[0004] 2. The existing femoral stem driver is a round rod with a handle, and there are threads on the rod head. When in use, the threads on the rod head are screwed into the femur In the screw hole reserved on the shoulder of the stem, hold the round rod by hand and send the femoral stem into the femoral medullary cavity, then use a bone hammer to strike the tail of the round rod until the femoral stem is compacted into the femoral medullary cavity. Need to rotate the femoral stem or the femoral stem driver, which is time-consuming, which is not good for the time-consuming operation time, and when the bone hammer is used to install the femoral stem, the thread of the rod head or the thread of the screw hole on the shoulder of the femoral stem is very easy The injury caused the femoral stem driver to fail to be disassembled after the femoral stem was installed, resulting in failure of the operation;

[0005]There are also some femoral stem drivers that use high-quality tool materials, local quenching of materials to improve hardness, and increase the diameter of butt threaded holes to make up for design defects, but due to high-quality The material is expensive, and the hardness of the material is increased by partial quenching, but it is easy to break. The enlarged butt threaded hole diameter is only suitable for large femoral stems, so there are certain defects;

[0006]3. Since the femoral stem driver and the femoral stem are connected by threads, when the bone hammer is used to strike the femoral stem driver, the direction of the femoral stem will easily follow the direction of the knock. Press down in the hitting direction, which has high requirements for the tapping force and direction. Once the tapping direction is wrong, the installation of the femoral stem will be skewed, which will easily lead to the failure of the operation;

Images