Opto-acoustic transducer for medical applications
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United States of America Patent
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-
Aug 31, 1999
Grant Date -
N/A
app pub date -
Apr 24, 1996
filing date -
Apr 24, 1996
priority date (Note) -
In Force
status (Latency Note)
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Abstract
This invention is an optically activated transducer for generating acoustic vibrations in a biological medium. The transducer is located at the end of a fiber optic which may be located within a catheter. Energy for operating the transducer is provided optically by laser light transmitted through the fiber optic to the transducer. Pulsed laser light is absorbed in the working fluid of the transducer to generate a thermal pressure and consequent adiabatic expansion of the transducer head such that it does work against the ambient medium. The transducer returns to its original state by a process of thermal cooling. The motion of the transducer within the ambient medium couples acoustic energy into the medium. By pulsing the laser at a high repetition rate (which may vary from CW to 100 kHz) an ultrasonic radiation field can be established locally in the medium. This method of producing ultrasonic vibrations can be used in vivo for the treatment of stroke-related conditions in humans, particularly for dissolving thrombus. The catheter may also incorporate anti-thrombolytic drug treatments as an adjunct therapy and it may be operated in conjunction with ultrasonic detection equipment for imaging and feedback control.
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First Claim
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International Classification(s)
Cited Art Landscape
| Patent Info | (Count) | # Cites | Year |
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| * 4503564 Opto-acoustic transducer for a telephone receiver | 69 | 1982 | |
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| * 4589415 Method and system for fragmenting kidney stones | 109 | 1984 | |
| * 4887605 Laser catheter delivery system for controlled atheroma ablation combining laser angioplasty and intra-arterial ultrasonic imagining | 186 | 1988 | |
| * 4832024 Cardio-vascular catheter for shooting a laser beam | 174 | 1988 | |
| * 5059200 Laser lithotripsy | 31 | 1990 | |
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| * 5377683 Ultrasound-laser surgery apparatus and method | 40 | 1991 | |
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| * 5304171 Catheter devices and methods for delivering | 141 | 1993 | |
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| * 5146917 Fibre-optic apparatus for the photodynamic treatment of tumors | 35 | 1991 | |
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| * 5188632 Guidance and delivery system for high-energy pulsed laser light | 103 | 1990 | |
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| * 5380273 Vibrating catheter | 111 | 1993 | |
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| * 5368558 Ultrasonic ablation catheter device having endoscopic component and method of using same | 228 | 1993 | |
| * 5474530 Angioplasty and ablative devices having onboard ultrasound components and devices and methods for utilizing ultrasound to treat or prevent vasospasm | 219 | 1994 | |
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| * 5058570 Ultrasonic surgical apparatus | 110 | 1988 | |
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| * 5116227 Process for cleaning and enlarging passages | 27 | 1991 | |
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| * 5304115 Ultrasonic angioplasty device incorporating improved transmission member and ablation probe | 339 | 1991 | |
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| * 5399158 Method of lysing thrombi | 38 | 1993 | |
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| * 5353262 Optical transducer and method of use | 60 | 1993 | |
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| * 5350375 Methods for laser induced fluorescence intensity feedback control during laser angioplasty | 97 | 1993 | |
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| * 4900921 System and method for opto-acoustic liquid quantity measurement and transducer therefor | 34 | 1988 | |
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| * 4852567 Laser tipped catheter | 129 | 1988 | |
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| * 5163421 In vivo ultrasonic system with angioplasty and ultrasonic contrast imaging | 244 | 1989 | |
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| * 5350377 Medical catheter using optical fibers that transmit both laser energy and ultrasonic imaging signals | 65 | 1992 | |
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| * 4844585 Optically excited vibratile transducer | 6 | 1988 | |
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| * 5366490 Medical probe device and method | 529 | 1993 | |
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| * 5217454 Laser delivery catheter | 55 | 1991 | |
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| * 5029588 Laser catheter with imaging capability | 239 | 1989 | |
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| * 5069664 Intravascular ultrasonic angioplasty probe | 153 | 1990 | |
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| * 4834093 Dilation catheter and method | 52 | 1986 | |
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| * 4985028 Catheter | 56 | 1989 | |
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* Cited By Examiner
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