Load sensing surgical instruments - Development and characterisation of low firing thick-film materials systems for medical steels
The goal of this project was to develop low-firing thick-film materials systems for the fabrication of piezoresistive sensors on special steels, for the fabrication of instrumented medical devices. To this end, a series of individual thick-film materials and complete systems, based on lead borosilicate glasses, were developed and extensively characterised. These studies allowed us to formulate an optimised system firing at 625°C and applicable to austenitic, ferritic and martensitic steels. The functionality of this system was demonstrated with several steels by manufacturing pressure sensors and – in this report – by successfully instrumenting the previously developed knee-balancing force sensor . The moderate achieved firing temperature strongly reduces compatibility problems with steels, compared to standard thick-film systems that require firing at 850°C: oxidation and annealing of the steel are considerably reduced, and, especially, phase transition problems are eliminated, allowing the use of high-strength martensitic steels as substrates. Finally, preliminary studies were carried out to eliminate lead from our materials, by replacing lead borosilicate glasses by compositions in the bismuth-zinc borosilicate system, with successful proof-of-principle results.
- URL: http://co-me.ch/
Keywords: couches épaisses ; thick-film technology ; basse température de cuisson ; low firing temperature ; systèmes de matériaux ; materials systems ; diélectriques ; dielectrics ; conducteurs ; conductors ; résistances ; resistors ; verrages ; glaçures ; overglazes
Final technical report, NCCR CO-ME II-6-3 (Load-sensing instruments and implants, thick-film technology), LPM, EPFL, Lausanne (CH)
Record created on 2013-11-13, modified on 2016-08-09