Design and construction of a simulator for testing finger joint replacements

A simulator for testing finger joint replacements was developed. Movement i ntervals of 15 degrees at flexion and extension plain can be set using an a djustable crank drive. The maximum range of motion is 105 degrees, 90 degre es being the maximum flexion and 15 degrees the extension. Thus, the simula tor is also suitable for impingement tests. A constant joint load is infini tely variable from 20 N to 500 N. Test frequency is also infinitely variabl e from 0.2 Hz to 2 Hz. A modular assembly of the components of the prosthes is means that these can be positioned as required, and that any type of pro sthesis may be tested. The design and the material allow for an all-round l ubrication at a heat up to 37 degrees C. The equipment is designed for perm anent operation. Pre-clinical quality assurance for finger joint replacemen ts can be considerably improved by the implementation of the present simula tor.