Hip Universal Rotation Lost Wax Castings

Product Introduction

Artificial hip joint simulation testing machine

1. Technical field

The utility model relates to an artificial hip joint testing machine, in particular to an artificial hip joint testing machine for simulating the motion state and stress of the acetabulum of the human hip joint.

2. Background technology

The hip joint is the joint with the most complex stress in the human body, and it is also a site prone to joint diseases, such as traumatic diseases, ischemic necrotic diseases, degenerative diseases, and inflammatory and neoplastic diseases. Worldwide, more than 600,000 patients undergo hip replacement surgery each year. With the development of modern medical technology, there are more and more cases of artificial hip replacement surgery. The wear and tear of artificial joints can not only cause the destruction of the joint prosthesis itself and cause mechanical failure but also produce a large number of wear particles to induce osteolysis around the prosthesis. Studies have shown that the late loosening of the artificial hip joint is related to the continuous increase of wear particles (wear debris) and the foreign body reaction it causes. Researchers at home and abroad have conducted a lot of research on the design and surface coating of artificial hip joint materials (Hip Universal Rotation Lost Wax Castings), expecting to reduce wear and wear debris by changing the matching materials, but the results are not good. Therefore, it is necessary to systematically study the strength, creep, and wear of artificial hip joints. There are very few domestic reports on the development of hip joint simulation testing machines, and there is still a certain gap compared with foreign research on simulation testing machines.

At present, an artificial hip joint simulation testing machine can simulate the actual motion state and working environment of the human hip joint as accurately as possible in the laboratory environment and can make the friction mechanism and wear form of the joint under test in the test process consistent with the actual It is consistent under the conditions of use so that the biomechanical performance parameters of artificial joint materials can be studied and tested accurately and reliably.

3. Contents of the invention:

The utility model is to provide an artificial hip joint simulation testing machine. The testing machine realizes the extension\flexion (FE) or adduction\abduction (AA), internal rotation\external rotation of the human hip joint under the bionic state through five mechanisms. Rotary (IER) movement, the testing machine has the characteristics of simple development, practicality, strong expandability, and high-cost performance.

The technical scheme of the utility model is: an artificial hip joint simulation testing machine, including a frame, a swing mechanism, a flexible loading mechanism, a rotation mechanism, and a hip joint fixture mechanism, and is characterized as a device for swinging the hip is installed on the bottom surface of the frame. The swing mechanism of the socket test piece, the hip joint fixture mechanism is installed on the swing mechanism, and the hip joint fixture mechanism is fixed on the rack table, and is connected with the rotation mechanism by transmission. The upper end of the hip joint fixture mechanism is connected to the flexible loading mechanism, and the flexible loading mechanism passes through The lever bracket is fixed on the rack table.

The flexible loading mechanism includes a molded spring, a pressure motor and a screw shaft, a fulcrum bracket, a lever, and the mold spring is set on the screw shaft of the pressure motor, the lower end is connected with the movable sleeve, the upper end is connected with the fixed sleeve, and the upper end of the fixed sleeve is connected. The lever is movably connected to the lever bracket.

The ratio of the distance between the connecting end of the lever and the fixed bushing to the center of rotation of the lever bracket and the distance between the connecting end of the lever and the hip joint clamp mechanism and the center of rotation of the lever bracket is 2.5:1.

An acetabular cup seat is arranged in the swing mechanism, and an inclined surface is arranged on the upper end of the acetabular cup seat, and the inclined angle of the inclined surface is 23°.

The beneficial effects of the utility model are:

The test machine of the utility model can realize the extension\flexion (FE) or adduction\abduction (AA), internal rotation\external rotation (IER) movement of the human hip joint in the bionic state. Simultaneously achieve the following two different forms of movement:

(1) Multi-directional compound mode: compounded by the swing mechanism and the rotary mechanism, it can realize movement in three directions (FE, AA, IER).

(2) One-way mode: that is, the rotation of the swing mechanism or the rotation mechanism in a single direction, and this movement state is mainly completed by the movement of a single mechanism.

The utility model adopts the movement simulated by the three-axis testing machine to be closer to reality than the two-axis one, and the obtained experimental results are more consistent with the clinical data. This testing machine has the characteristics of simple development, practicality, strong expandability, and high-cost performance.

Detection Systems

Copper Silica Sol Investment Casting