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Feature

This hip joint simulator is designed and developed to evaluating the wear of biomaterials ( ultrahigh molecular weight polyethylene, Co-cr alloy, alumina, etc.) used in total hip joint replacement.

This hip joint simulator mimics the joint motion and joint loading of human gait by adapting the 4 degree of freedom in kinematic motion ( flexing/extension, adduction/abduction, internal rotation/external rotation) and axial loading.

Joint loading having double peaks was imposed by displacement control from a ball screw, LM guide, and spring system. The major hip joint motion, flextion/extension, was activated by a parallel link system moving on oscillating rotation motion in a range of ¡¾25¡Æ, internal/external rotation motion was activated by another parallel link system moving in oscillating rotational motion in a range of ¡¾20¡Æ, and adduction/abduction motion was activated by another parallel link system moving in oscillating rotational motion in a range of ¡¾9¡Æ.

Each kinematic link system operates separately or coupled (two or three) modes synchronously.

System Description

This system is consisted of upper and lower sample assembly, axial loading motion and flexing/extension, adduction/abduction, internal rotation/external rotation motion by 8 servo motors and harmonic drivers, wear sensing part, controller, software and computer.

HS-112 hip joint simulator developed in this study can simulate the joint loading and kinematic motion in hip joint, and this device can be used to conduct wear simulation tests on the biomaterials used for total hip joint replacements in bovine serum environment.

This hip joint simulator to be used for evaluating the wear performance of newly developed biomaterials and for evaluating the mechanical performance on the new design of components in total hip joint replacement.

Technical Spec.

Station : 2 station ( 2 banks of 2 )

Axial shaft : 4 axis driving system

Axis control : DC servo control method

Axis loading : 4,500N

Internal/External rotation : ¡¾20¡Æ/5N.m

Flexion /Extension angle : ¡¾20¡Æ/10N.m

Adduction/abduction angle : ¡¾9¡Æ/5N.m

Load cell : 5,000 N (independent load cell 4ea)

Temperature control : ambient to +50¡ÆC

Speed : 0~2Hz

A/D converter

Data acquisition rate control

Auto zero setting with test start position

Auto scaling

Zoom up/down function