| abstract |
This invention is a system and method for percutaneous myocardial revascularization using laser energy emitted from the distal end of a catheter. A technique for controlling beam direction allows the creation of channels in a patient's heart tissue with the channels having different orientations relative to the distal end. An arrangement provides for the creation of a plurality of channels at one time by simultaneous application of a plurality of beams of laser energy. A navigation arrangement uses two non-coplanar magnetic sensing coils (124F, 124T, 124S) in the distal end of the catheter cooperating with three sets of three magnetic field generating external coils (i.e., external to the patient) (120F1-120F3, 120S1-120S3, 120T1-120T3). Each of the three sets is sequentially energized and the sensing coils in the distal end sense the magnetic fields established. A computer compares the sensed fields with the known sequence of energizing the external coils and thereby determines the opposition of the distal end. A pressure sensor in the catheter senses ventricular pressure in the patient's heart during and immediately after revascularization. |