Development of a New Tribological Multi-Function Simulator

2007 ◽  
Author(s):  
Zikai Hua ◽  
Jianhua Zhang ◽  
Ke Xue
Keyword(s):  
Hip Joint ◽  
Frequency Control ◽  
Rotation Frequency ◽  
Hip Joints ◽  
Hip Prostheses ◽  
Frequency Control System ◽  
Wide Range ◽  
Total Hip Prostheses ◽  
Hip Joint Simulator ◽  
Basic Motion

In this study, a new developed tribological multi-function simulator system, SHU-MFS is firstly introduced. By changing of the holder, a hip joint simulator and a POD tester can be generated in the new system. The simulator is designed not only for wear tests of the total hip prostheses, but also applicable in common tribological study. As to the module of hip joint simulator, this design can be described as having the basic motion components in human hip joints. A frequency control system is developed to offer a wide range of rotation frequency so as to provide proper experiments towards different groups. In the POD part, eight precision-made pins are generated and an advanced computer system is built up to measure the friction coefficient of the test samples.

A Three-Axis Hip Joint Simulator for Wear and Friction Studies on Total Hip Prostheses

1996 ◽  
Vol 210 (3) ◽  
pp. 175-185 ◽  
Author(s):  
Vesa O Saikko
Keyword(s):  
Hip Joint ◽  
External Rotation ◽  
Frictional Torque ◽  
Hip Prostheses ◽  
Total Hip ◽  
Flexion Extension ◽  
Single Station ◽  
Wear And Friction ◽  
Total Hip Prostheses ◽  
Hip Joint Simulator

A three-axial, single-station hip joint simulator was designed and built for wear and friction studies on total hip prostheses. The design of the apparatus is described in detail. Continuous level walking is simulated. All three motion components, flexion-extension, abduction-adduction and internal-external rotation, are included. The motions are implemented electromechanically and the uniaxial load pneumatically. The load is measured continuously. For accurate measurement of wear, the apparatus has a loaded control joint, which also renders both the test and control joints self-centring, as they are loaded in series. The frictional torque of the test joint can be measured continuously throughout the wear test, which is an exceptional feature. Four tests of five million cycles each were completed using 32 mm diameter Co-Cr-Mo femoral heads and 5.6 mm thick, metal-backed, ultra-high molecular weight polyethylene acetabular cups as test specimens. Their wear and friction behaviour is described and discussed in relation to previous simulator studies and clinical observations. The lubricant was distilled water, maintained at body temperature. The wear of the cups was measured gravimetrically at intervals. The average wear rate was 3.9 mg/one million cycles, corresponding to 0.03 mm/year, and the average coefficient of friction was 0.01.

Biotribological study of multilayer coated metal-on-metal hip prostheses in a hip joint simulator

Wear ◽  
2013 ◽  
Vol 301 (1-2) ◽  
pp. 234-242 ◽  
Author(s):  
J.A. Ortega-Saenz ◽  
M. Alvarez-Vera ◽  
M.A.L. Hernandez-Rodriguez
Keyword(s):  
Hip Joint ◽  
Hip Prostheses ◽  
Coated Metal ◽  
Metal On Metal ◽  
Hip Joint Simulator

Design and Development of a Versatile Hip Joint Simulator and a Preliminary Assessment of Wear and Creep in Charnley Total Replacement Hip Joints

1988 ◽  
Vol 17 (3) ◽  
pp. 111-117 ◽  
Author(s):  
D Dowson ◽  
B Jobbins
Keyword(s):  
Hip Joint ◽  
Preliminary Assessment ◽  
Design And Development ◽  
Hip Joints ◽  
Total Replacement ◽  
Early Results ◽  
Hip Joint Simulator

This paper describes the design of a new 3-station hip joint simulator and briefly discusses early results.

scholarly journals Analysis of hip joint loading during walking with different shoe types using instrumented total hip prostheses

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Y. Palmowski ◽  
S. Popović ◽  
D. Kosack ◽  
P. Damm
Keyword(s):  
Hip Joint ◽  
Bending Moment ◽  
Careful Consideration ◽  
Heel Strike ◽  
Joint Loading ◽  
Hip Prostheses ◽  
Low Profile ◽  
Total Hip Prostheses ◽  
Joint Loads

AbstractHip joint loads need careful consideration during postoperative physiotherapy after joint replacement. One factor influencing joint loads is the choice of footwear, but it remains unclear which footwear is favorable. The objective of the present study was to investigate the influence of footwear on hip joint loads in vivo. Instrumented hip endoprostheses were used for in vivo load measurements. The parameters resultant contact force (Fres), bending moment (Mbend) and torsional moment (Mtors) were evaluated during treadmill walking at 4 km/h with different shoe types. In general, footwear tended to increase hip joint loading, with the barefoot shoe having the least influence. Fres and Mbend were significantly increased during heel strike for all shoe types in comparison to barefoot walking, with everyday shoe (34.6%; p = 0.028 and 47%; p = 0.028, respectively) and men’s shoe (33.2%; p = 0.043 and 41.1%; p = 0.043, respectively) resulting in the highest changes. Mtors at AbsMax was increased by all shoes except for the barefoot shoe, with the highest changes for men’s shoe (+ 17.6%, p = 0.043) and the shoe with stiffened sole (+ 17.5%, p = 0.08). Shoes, especially those with stiff soles or elaborate cuishing and guiding elements, increase hip joint loads during walking. The influence on peak loads is higher for Mtors than for Fres and Mbend. For patients in which a reduction of hip joints loads is desired, e.g. during physiotherapy after recent surgery or to alleviate symptoms of osteoarthritis, low profile shoes with a flexible sole may be preferred over shoes with a stiff sole or elaborate cushioning elements.

scholarly journals Design and Evaluation of a Hip Joint Implant Wear Simulator

2021 ◽  
Vol 9 (8) ◽  
pp. 989-994
Author(s):  
Everton C. Medeiros
Keyword(s):  
Hip Joint ◽  
Traffic Accidents ◽  
Low Cost ◽  
Test Machine ◽  
New Developments ◽  
Hip Prostheses ◽  
A Value ◽  
Joint Implant ◽  
Keywords Hip ◽  
Hip Joint Simulator

Abstract: Every year a high number of total hip arthroplasty is reported worldwide and an increase in this number is expected. Several factors may cause hip wear, such as osteoarthritis, obesity, traffic accidents and sport practicing. Wear is a concern when considering hip prostheses, since a prosthesis presents finite life that in many cases is shorter than patient life, and leads to substitution. Also, research is constant and new developments have to be tested, which leads to the necessity of testing devices that reproduce real conditions of hip joint implant functioning. This work describes a low-cost device, according to the ISO 12242. The equipment was built, a set of three commercially available prostheses was tested and the results show wear values coherent with those found in literature. It was found a value of wear rate of (13.30 ± 3,81) mg/106 cycles; wear factor found was (0.41 ± 0,09) x 10-6 mm3 /Nm. After testing, the device was evaluated and no component presented significant wear. Keywords: Hip joint simulator; Prostheses; Wear; Arthroplasty; Test machine.

Design of Small Variable Frequency Speed Regulation System Based on ARM

2014 ◽  
Vol 635-637 ◽  
pp. 1155-1158
Author(s):  
Chao Ye ◽  
Ting You Wang ◽  
Ye Yuan
Keyword(s):  
Control System ◽  
High Efficiency ◽  
Frequency Control ◽  
Low Cost ◽  
Control Signal ◽  
Regulation System ◽  
Power Module ◽  
Current Frequency ◽  
Frequency Control System ◽  
Wide Range

This paper presents a small ARM-based frequency control system, the voltage 220V/50Hz mains, rectified, filtered into DC, then reverse into adjustable frequency alternating current supplied to the motor used. Through software algorithms SPWM control signal generated by the microcontroller, the control signal sent through the intelligent power module, the realization of the DC inverter process. The design is simple, functional and meet the current frequency control system, modular, digital trends, has a waveform, small size, high efficiency, frequency wide range of features. Has good practical value and low cost.

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