Air cylinder self-resetting type hip joint test machine

Abstract

Disclosed is a gas cylinder self-resetting-type hip-joint testing machine, comprising a frame constituted of a top plate (31), a base plate (2) and a strut (15). A support frame (14) is provided in the frame, and a drive shaft (60) is fixed in the support frame (14). A lower cam wheel (5), a turbine (17), a central cam wheel (57) and an upper cam wheel (56) are successively provided on the drive shaft (60). A bearing seat with an arcuate surface is provided above the support frame (14) and a base with a spherical surface (53) is provided on the bearing seat with an arcuate surface and fits with the arcuate surface. A solution tray (26) is provided on the base with a spherical surface (53), and an articulation head ball seat (52) embedded in the base with a spherical surface (53) is provided in the solution tray (26). A movable platform (29) is provided on the solution tray (26) and is fixed to a tray edge thereof. The movable platform (29) is connected via a steel cable traction device and a pneumatic drive mechanism to the three cam wheels (5, 57, 56), respectively. A hydraulic cylinder (37) is provided on the top plate (31) with a piston rod of the hydraulic cylinder (37) passing through the top plate (31). A temperature controller (42) controlling the temperature in the solution tray (26) is provided on the top plate (31) and a ball push pin (8) is provided on the base plate (2) with the top of the ball push pin on the drive shaft (60). The testing machine has a compact structure, is low in cost, is convenient to operate, and can accurately simulate the actual movement of a human hip-joint in the environment of a testing room.

Description

technical field [0001] The invention relates to an artificial joint testing machine, in particular to a cylinder self-resetting type that can correctly simulate the actual motion conditions of the human hip joint in a laboratory environment and can reliably test the biotribological characteristic parameters of artificial joint materials Hip testing machine. Background technique [0002] As human society enters the aging stage, various joint diseases related to aging, such as femur fractures, arthritis and other diseases, will occur in large numbers, so the demand for artificial joints will also increase day by day. At present, about 30 million people in the world have been implanted with artificial joints, and the annual replacement volume is about 2 million. Artificial joints are subjected to severe stress in the body, such as artificial hip joints, which have to withstand about Load shocks and abrasions that may be several times the weight of the human body. At the sam...

AI Technical Summary

Problems solved by technology

The MK department of the University of Leeds and the University of Durham in the United Kingdom manufactured a multi-axis artificial hip joint simulation test machine, but the swing on the coronal plane was omitted in the design. Axial type artificial hip joint simulation testing machine, but due to the characteristics of the spring itself, the transmission is not stable. As the use time increases, the plastic deformation of the spring increases and the spring force decreases, and the size of the spring force is not easy to measure

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