Intra-Vascular Device With Pressure Detection Capabilities Using Pressure Sensitive Material
First Claim
1. A laser catheter having an outer surface, a distal end and proximal end, the laser catheter comprising:
- a fiber optic including a distal end and a proximal end, wherein the fiber optic is coincident with the catheter substantially along the length of the catheter, the proximal end of the fiber optic is coincident with the proximal end of the catheter, the distal end of the fiber optic is coincident with the distal end of the catheter, the proximal end is configured to receive light from a laser, and the fiber optic directs light through the catheter toward the distal end of the fiber optic to; and
a pressure sensor coupled with the laser catheter near the distal end of the fiber optic.
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Accused Products
Abstract
A laser catheter with a pressure sensor is provided according to embodiments of the invention. The pressure sensor may be coupled with the distal end of the laser catheter and may comprise any of various piezoelectric materials, for example Polyvinylidene Difluoride (PVDF). In various embodiments of the invention the pressure sensor is configured to detect pressure longitudinally and coaxially. The pressure sensor may provide an electric potential that is proportional to the vessel pressure and may be used to monitor and/or adjust laser parameters. In other embodiments the results from the pressure sensor may be used to determine the vessel size and/or the type of material being ablated.
84 Citations
27 Claims
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1. A laser catheter having an outer surface, a distal end and proximal end, the laser catheter comprising:
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a fiber optic including a distal end and a proximal end, wherein the fiber optic is coincident with the catheter substantially along the length of the catheter, the proximal end of the fiber optic is coincident with the proximal end of the catheter, the distal end of the fiber optic is coincident with the distal end of the catheter, the proximal end is configured to receive light from a laser, and the fiber optic directs light through the catheter toward the distal end of the fiber optic to; and a pressure sensor coupled with the laser catheter near the distal end of the fiber optic. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for monitoring laser atherectomy within a cavity using pressure measurements, the method comprising:
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inserting a laser catheter within the cavity, wherein the laser catheter includes a fiber optic to channel laser light from a laser to a distal tip of the laser catheter and a pressure sensor coupled with the laser catheter near the distal tip of the laser catheter; pulsing the laser using a first set of laser parameters; measuring the pressure within the cavity using the pressure sensor; determining whether the detected pressure within the cavity is within tolerances; and changing the laser parameters to a second set of laser parameters in response to the determining whether the detected pressure within the cavity is within tolerances. - View Dependent Claims (20, 21, 22)
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23. A laser catheter having an outer surface, a distal end and proximal end, the laser catheter comprising:
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a lumen within the catheter that runs the longitudinal length of the catheter; a fiber optic including a distal end and a proximal end, wherein the fiber optic is coincident with the catheter substantially along the length of the catheter, the proximal end of the fiber optic is coincident with the proximal end of the catheter, the distal end of the fiber optic is coincident with the distal end of the catheter, the proximal end is configured to receive light from a laser, and the fiber optic is configured to direct light through the catheter from the distal end of the fiber optic; a band with an inner and outer surface, wherein the band is configured to allow the distal end of the catheter to pass through the inner diameter of the band; and a strain sensor coupled with the catheter near the distal end of the catheter and coupled with the band, wherein the strain sensor is configured to transform motion of the band relative to the catheter into an electrical signal proportional to a pressure on the band, the strain sensor comprises Polyvinylidene Difluoride, and the strain sensor is configured to detect pressure along a longitudinal path extending from the distal end of the catheter.
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24. A laser catheter having an outer surface, a distal end and proximal end, the laser catheter comprising:
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a lumen within the catheter that runs the longitudinal length of the catheter; a fiber optic including a distal end and a proximal end, wherein the fiber optic is coincident with the catheter substantially along the length of the catheter, the proximal end of the fiber optic is coincident with the proximal end of the catheter, the distal end of the fiber optic is coincident with the distal end of the catheter, the proximal end is configured to receive light from a laser, and the fiber optic is configured to direct light through the catheter from the distal end of the fiber optic; a pressure sensor comprising at least one layer of Polyvinylidene Difluoride film on the outer diameter of the catheter, wherein the pressure sensor is configured to detect pressure detected on the outer surface of the catheter near the distal end of the fiber optic.
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25. A method for identifying cavity size using a laser catheter within the cavity, the method comprising:
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inserting the laser catheter within the cavity, wherein the laser catheter includes a fiber optic to channel laser light from a laser to a distal tip of the laser catheter and a pressure sensor coupled with the laser catheter near the distal tip of the laser catheter; pulsing a laser coupled with the laser catheter using a first set of laser parameters; and measuring the frequency response of the material within the cavity in response to the laser pulsing using a pressure sensor. - View Dependent Claims (26, 27)
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Specification