DIAGNOSTIC TECHNIQUE FOR JOINT IMPLANT WITH METAL FRICTION PAIR Russian patent published in 2015 - IPC A61F2/30 G09B23/28 

FIELD: medicine.

SUBSTANCE: invention refers to medical equipment tests, namely to production tests of joint implants with a metal friction pair the state of which is assessed in the course of testing with using electric (electrically resistive) diagnostic techniques. The diagnostic technique for joint implants with the metal friction pair consisting in the fact that the implant is mounted in a test bench loaded with axial force; a lubricant layer is formed between surfaces of the implant components, and the physical characteristics of the surface layer of the components in the friction zone are measured. Small AC current is passed through the friction zone of the implant; a temporary function of complex impedance of the implant tribocoupling is recorded; it uses its active and reactive component parameters to show an actual thickness of the lubricant layer and a lubricant type prevailing in the tribocoupling and a friction regimen. The actual technical condition of the joint implant tribocoupling is assessed by a ratio of the time intervals when the active part of the complex impedance is more than the reactive part to the total measurement time.

EFFECT: invention provides shortening the test time, assessing the real time of the contact of the friction surfaces, increasing the produced valid signal power and noise stability, in obtaining the objective initial diagnostic information from the friction zone in order to predict a durability of the joint implant with the metal friction pair.

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