According to the invention, a novelly improved ablation device includes releasably joinable drive and catheter assemblies. The drive assembly includes a tachometer assembly and a regulator for monitoring and controlling ablating burr speed. A bifurcated drive shaft includes a coiled distal portion and...http://www.google.de/patents/US5938670?utm_source=gb-gplus-sharePatent US5938670 - Ablation devices and methods of use
