Prosthesis and Orthopedy
Joint implants are subject to strict requirements in terms of medical tolerability, service life, and wear. Standards such as ISO 7207 for partial and total knee joint prostheses specify the Requisite surface characteristics and thereby give guidance for the control of the production process. Especially for these high demands, NanoFocus developed the µsurf implant. Equipped with rotary axis, specially customized implant holding devices, automation software and a multisensor measuring head, the confocal measurement system is suitable for the deployment in the testing and development laboratory as well as for automatable serial measurements of implants close to production.Finest roughness structures are acquired aerially and reproduced with highest accuracy with the confocal µsurf technology by NanoFocus. A comparison analysis with tactile roughness values (R-parameters) is possible without any conflicts, although 3D values have a much higher significance.Implant components such as femur and tibia of an artificial knee joint are fixated on the rotary axis with the help of the clamping device. By means of barcode-scanning the individual product is identified and a predefined measurement recipe is retrieved. After an automated distance measurement, the measuring system moves to the specified positions and measures the test positions without any interference by the user. Metal, plastics and ceramics surfaces as well are acquired reliably with the measurement result being just a few clicks away.The µsurf implant measurement system combines a chromatic distance sensor with a confocal µsurf sensor in one measuring head. The distance control is conducted by the fast point sensor. Afterwards, the defined measuring points are acquired areally with highest precision. Measurement results can be directly transferred to pre-defined evaluation protocols. They can also be exported to further relevant software, such as qs-STAT, Matlab or SAP data bases, via various data interfaces. An industry-specific rights management and an integrated audit-trail guarantee unmanipulated measurement results in compliance with certification requirements according to FDA regulations.