A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
327/1.2, 88/97.5
A61B 18/24 (2006.01) G02B 6/42 (2006.01) A61B 19/00 (2006.01)
Patent
CA 1266304
2B410/709 AZB/dmc 6598B ABSTRACT OF THE DISCLOSURE A catheter for delivering radiant energy, such as a laser beam, is used in a technique to controllably apply the radiant energy in a patient's body, such as in a blood vessel. The radiant energy is applied in a manner which erodes biological material and may be used to drill through vascular obstructions. The catheter emits the radiant energy from its distal end in a pattern which defines a relatively small working region in which the energy density level is sufficiently high to remove the biological material. The energy distribution is substantially uniform across the beam. Distally beyond the working region, the energy density of the beam decays sharply so that biological material beyond the working region is not removed. Biological material is removed in very limited layer-like regions and in a manner in which a distally propogated segment of the beam will not have sufficient energy density to puncture the blood vessel wall. The catheter is a of elongate flexible tubular construction having a fiber optic wave guide extending through the lumen of the catheter. The distal end of the optical fiber terminates within the catheter and is secured in alignment with an optical system at the distal end of the catheter.
503489
Herman Stephen Jack
Roth Laurence Andrew
Sinofsky Edward Lawrence
Turnquist Carl Richard
Wong Jacob Yauman
C.r. Bard Inc.
Swabey Ogilvy Renault
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