A miniaturized obstruction treatment device, e.g., a brush, particularly adapted for medical use formed at the distal end of an elongated brush drive shaft having a hollow lumen formed therein for introduction over a guidewire. The brush drive shaft is enclosed in the lumen of an brush delivery catheter,...http://www.google.de/patents/US6022363?utm_source=gb-gplus-sharePatent US6022363 - Rotatable dynamic seal and guide for a medical obstruction treatment device sub-assembly coupled to a drive motor unit
