Catheter systems and methods for implanting helical or dart-like implants into the myocardium or other body tissue. The catheter system includes a helix for fixing the distal end of the catheter to the myocardium, an implant held by the helix, mechanisms for driving the fixation helix into the myocardium,...http://www.google.com/patents/US6971998?utm_source=gb-gplus-sharePatent US6971998 - Implant delivery catheter system and methods for its use
