Apparatus and method are described for delivery of a treating element, such as a radiation source, through a catheter to a desired site in the vascular system of a patient, such as a coronary artery, for inhibiting the formation of scar tissue such as may occur in restenosis following ...http://www.google.com/patents/US5683345?utm_source=gb-gplus-sharePatent US5683345 - Method and apparatus for treating a desired area in the vascular system of a patient 
