US4791926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of controlling laser energy removal of plaque to prevent vessel wall damage
Assignee: Edwards Lifesciences Corp
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Filing: 1987-11-10
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Granted: 1988-12-20
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Expires: 2007-11-10
Abstract
Abstract A method of controlling laser energy removal of plaque or other obstructions from a vessel of the cardiovascular system includes advancing a laser delivery catheter to a position in proximity with a targeted lesion, placing a laser energy sensor device in a monitoring position adapted to sense laser energy from the catheter that passes beyond the lesion, and controlling the laser energy according to the output of the sensor. An intraoperative approach places the sensor external to the vessel, while a percutaneous approach places the sensor within the vessel utilizing an additional sensor fiber on the catheter that extends beyond the lesion to the monitoring position. Each fiber in a multifiber laser delivery bundle may be controlled according to sensor output for precision aiming and improved laser control.
Inventors
- 👤 Stephen M. Fry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:44
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/18; A61B18/20; A61B18/22; A61B18/24; A61B18/245; A61B2018/00636
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
161 words
A laser delivery system, comprising: a catheter adapted to be advanced within a vessel to a position in which a distal end of the catheter is in proximity with a targeted lesion; at least one laser delivery fiber extending within the catheter to the distal end through which to propagate laser energy toward the lesion; and a laser energy sensor adapted to be placed in a monitoring position beyond the lesion and sense laser energy propagated through the laser delivery fibers that passes beyond the lesion; whereby the output of the sensor can be used to control the propagation of laser energy through the fiber in order to subject the lesion to laser energy without damaging the vessel wall beyond the lesion; and wherein the laser energy sensor includes a sensor fiber extending within the catheter and beyond the distal end to a position sufficiently beyond the distal end to extend through an opening in the lesion to the monitoring position.
Claim 2
Dependent Claim
161 words
A laser delivery system, comprising: a catheter adapted to be advanced within a vessel to a position in which a distal end of the catheter is in proximity with a targeted lesion; at least one laser delivery fiber extending within the catheter to the distal end through which to propagate laser energy toward the lesion; and a laser energy sensor adapted to be placed in a monitoring position beyond the lesion and sense laser energy propagated through the laser delivery fibers that passes beyond the lesion; whereby the output of the sensor can be used to control the propagation of laser energy through the fiber in order to subject the lesion to laser energy without damaging the vessel wall beyond the lesion; and wherein the laser energy sensor includes a sensor fiber extending within the catheter and beyond the distal end to a position sufficiently beyond the distal end to extend through an opening in the lesion to the monitoring position.
Claim 3
Independent Claim
88 words
A method of removing an obstruction from a vessel of the cardiovascular system with laser energy, comprising: advancing a laser delivery catheter within the vessel to a position in proximity with a targeted lesion in the vessel; placing a laser energy sensor in a monitoring position adapted to sense laser energy from the catheter that passes beyond the lesion; propagating laser energy through the catheter toward the lesion to subject the lesion to the laser energy; and controlling the laser energy according to the output of the sensor.
Claim 4
Independent Claim
88 words
A method of removing an obstruction from a vessel of the cardiovascular system with laser energy, comprising: advancing a laser delivery catheter within the vessel to a position in proximity with a targeted lesion in the vessel; placing a laser energy sensor in a monitoring position adapted to sense laser energy from the catheter that passes beyond the lesion; propagating laser energy through the catheter toward the lesion to subject the lesion to the laser energy; and controlling the laser energy according to the output of the sensor.
Claim 5
Dependent Claim
16 words
A method as recited in claim 2, wherein: the sensor is placed external to the vessel.
Claim 6
Dependent Claim
77 words
A method as recited in claim 3, wherein: the laser delivery catheter has a plurality of laser delivery fibers; the step of advancing the laser delivery catheter includes advancing the catheter to a position in which the distal end of the laser delivery fibers are in proximity with the targeted lesion; and the step of propagating laser energy includes propagating laser energy through selected ones of the laser delivery fibers according to the output of the sensor.
Claim 7
Dependent Claim
35 words
A method as recited in claim 4, wherein the step of propagating laser energy includes: propagating laser energy through the laser delivery fibers in groups of one or more fibers, one group at a time.
Claim 8
Dependent Claim
15 words
A method as recited in claim 2, wherein: the sensor is placed within the vessel.
Claim 9
Dependent Claim
111 words
A method as recited in claim 6, wherein: the step of advancing a laser delivery catheter includes using a laser delivery catheter having a plurality of laser delivery fibers and a sensor fiber, the step of advancing a laser delivery catheter further includes advancing the catheter to a position in which the distal end of the laser delivery fibers are in proximity with a targeted lesion and the sensor fiber extends beyond the lesion to a position adapted to sense laser energy passing beyond the lesion; the step of propagating laser energy includes propagating laser energy through selected ones of the laser delivery fibers according to the output of the sensor.
Claim 10
Dependent Claim
35 words
A method as recited in claim 7, wherein the step of propagating laser energy includes: propagating laser energy through the laser delivery fibers in groups of one or more fibers, one group at a time.
Claim 11
Dependent Claim
40 words
A method as recited in claim 2, wherein the step of controlling the laser energy includes: producing a human sensible signal to alert an operator in the event more than a predetermined level of laser energy passes beyond the lesion.
Claim 12
Dependent Claim
43 words
A method as recited in claim 2, wherein the step of controlling the laser energy includes: producing an electrical control signal to be used in controlling the laser in the event more than a predetermined level of laser energy passes beyond the lesion.
Claim 13
Independent Claim
150 words
A method of removing an obstruction from a vessel of the cardiovascular system with a laser delivery catheter having a plurality of laser delivery fibers and a sensor fiber, comprising: advancing the catheter to a position in which the distal end of the laser delivery fibers are in proximity with a targeted lesion and the sensor fiber extends beyond the lesion to a position adapted to sense laser energy passing beyond the lesion; propagating laser energy through at least one of the laser delivery fibers toward the lesion; processing the output of the sensor to produce an electrical signal to be used in controlling the laser energy according to the level of laser energy passing beyond the lesion as indicated by the output of the sensor; and deactivating the laser energy with the electrical signal in the event more than a predetermined amount of laser energy passes beyond the lesion.
Claim 14
Independent Claim
150 words
A method of removing an obstruction from a vessel of the cardiovascular system with a laser delivery catheter having a plurality of laser delivery fibers and a sensor fiber, comprising: advancing the catheter to a position in which the distal end of the laser delivery fibers are in proximity with a targeted lesion and the sensor fiber extends beyond the lesion to a position adapted to sense laser energy passing beyond the lesion; propagating laser energy through at least one of the laser delivery fibers toward the lesion; processing the output of the sensor to produce an electrical signal to be used in controlling the laser energy according to the level of laser energy passing beyond the lesion as indicated by the output of the sensor; and deactivating the laser energy with the electrical signal in the event more than a predetermined amount of laser energy passes beyond the lesion.
Claim 15
Dependent Claim
42 words
A method as recited in claim 11, wherein the step of processing the output of the sensor includes: selecting a group of one or more fibers through which to propagate laser energy that is directed at a portion of the targeted lesion.
Claim 16
Dependent Claim
34 words
A method as recited in claim 11, wherein the step of processing the output of the sensor includes: decoupling the laser energy from a fiber that is in a position to miss the lesion.
Claim 17
Dependent Claim
95 words
A laser delivery catheter, comprising: a catheter body adapted to be advanced within a vessel to a position in which a distal end of the catheter body is in proximity with a targeted lesion; at least one laser delivery fiber extending within the catheter body to the distal end through which to propagate laser energy toward the lesion; and a sensor fiber extending within the catheter body and beyond the distal end to a position sufficiently beyond the distal end to extend through an opening in the lesion to a monitoring position beyond the lesion.
Claim 18
Dependent Claim
95 words
A laser delivery catheter, comprising: a catheter body adapted to be advanced within a vessel to a position in which a distal end of the catheter body is in proximity with a targeted lesion; at least one laser delivery fiber extending within the catheter body to the distal end through which to propagate laser energy toward the lesion; and a sensor fiber extending within the catheter body and beyond the distal end to a position sufficiently beyond the distal end to extend through an opening in the lesion to a monitoring position beyond the lesion.
Claim 19
Dependent Claim
103 words
A laser delivery catheter, comprising: a catheter body adapted to be advanced within a vessel to a position in which a distal end of the catheter body is in proximity with a targeted lesion; at least one laser delivery fiber extending within the catheter body to the distal end through which to propagate laser energy toward the lesion; and a sensor fiber extending within the catheter body, which sensor fiber is adapted to be selectively extended beyond the distal end to a position sufficiently beyond the distal end to extend through an opening in the lesion to a monitoring position beyond the lesion.
Claim 20
Dependent Claim
103 words
A laser delivery catheter, comprising: a catheter body adapted to be advanced within a vessel to a position in which a distal end of the catheter body is in proximity with a targeted lesion; at least one laser delivery fiber extending within the catheter body to the distal end through which to propagate laser energy toward the lesion; and a sensor fiber extending within the catheter body, which sensor fiber is adapted to be selectively extended beyond the distal end to a position sufficiently beyond the distal end to extend through an opening in the lesion to a monitoring position beyond the lesion.
Claim 21
Dependent Claim
169 words
A laser delivery system, comprising: a catheter adapted to be advanced within a vessel to a position in which a distal end of the catheter is in proximity with a targeted lesion; at least one laser delivery fiber extending within the catheter to the distal end through which to propagate laser energy toward the lesion; and a laser energy sensor adapted to be placed in a monitoring position beyond the lesion and sense laser energy propagated through the laser delivery fibers that passes beyond the lesion; whereby the output of the sensor can be used to control the propagation of laser energy through the fiber in order to subject the lesion to laser energy without damaging the vessel wall beyond the lesion; and wherein the laser energy sensor includes a sensor fiber extending within the catheter, which sensor fiber is adapted to be selectively extended beyond the distal end to a position sufficiently beyond the distal end to extend through an opening in the lesion to the monitoring position.
Claim 22
Dependent Claim
169 words
A laser delivery system, comprising: a catheter adapted to be advanced within a vessel to a position in which a distal end of the catheter is in proximity with a targeted lesion; at least one laser delivery fiber extending within the catheter to the distal end through which to propagate laser energy toward the lesion; and a laser energy sensor adapted to be placed in a monitoring position beyond the lesion and sense laser energy propagated through the laser delivery fibers that passes beyond the lesion; whereby the output of the sensor can be used to control the propagation of laser energy through the fiber in order to subject the lesion to laser energy without damaging the vessel wall beyond the lesion; and wherein the laser energy sensor includes a sensor fiber extending within the catheter, which sensor fiber is adapted to be selectively extended beyond the distal end to a position sufficiently beyond the distal end to extend through an opening in the lesion to the monitoring position.
References Cited (Backward Citations)
US4266547A
Cited
US4469098A
Cited
US4316467A
Cited
WO1982001669A1
Cited
EP0069930A1
Cited
US4476512A
Cited
GB2125986A
Cited
US4653495A
Cited
US4587972A
Cited
US4718417A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-20 | 1992-06-20 | 1992-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-20 | 1996-06-20 | 1996-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-20 | 2000-06-20 | 2000-12-20 | $7700.00 | Window Closed / Lapsed |