Laser system and method for treatment of biologic targets
First Claim
1. A method for treating biologic tissue with laser light, comprising:
- generating a long effective laser light output pulse comprising a series of sub-pulses having a duty cycle that is less than 50% over a selected effective pulse duration and a periodicity that is less than the thermal relaxation time of a targeted structure; and
delivering the laser light to the tissue of a patient.
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Accused Products
Abstract
A long pulse alexandrite laser for treating dermatological specimens is disclosed. The use of alexandrite allows operation in the near-infrared, specifically in a 50 nm range surrounding 755. Infrared in this range allows good penetration while still achieving an acceptable ratio of hemoglobin to melanin absorption. In operation, the laser generates pulses having a durations between 5 and 100 msec and fluences between 10 and 50 J/cm2. A light delivery system is provided that transmits the laser light output pulse to dermatological targets of a patient. The invention is also directed to a hair removal system. Here, it is desirable to use an index-matching application on the skin sections to be treated, and a visual indicator is thermo- or photo-responsive or otherwise responsive to the laser light pulse to generate a visible change. Also, the invention is directed to a combined sclerotherapy and light treatment method and kit for unwanted veins. Substantially increased success has been achieved by implementing a dwell time of between 12 hours and 6 months between the light-based therapy and the sclerotherapy. Finally, the invention relates to pulse periodic heating of biologic targets, including systems and methods for generating an effective light output pulse comprising a series of sub-pulses with a limited duty cycle and a periodicity that is less than the thermal relaxation time of the targeted structure.
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Citations
26 Claims
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1. A method for treating biologic tissue with laser light, comprising:
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generating a long effective laser light output pulse comprising a series of sub-pulses having a duty cycle that is less than 50% over a selected effective pulse duration and a periodicity that is less than the thermal relaxation time of a targeted structure; and
delivering the laser light to the tissue of a patient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A laser system for treating biologic tissue of a patient, comprising:
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a laser light source for generating a long effective laser light output pulse comprising a series of sub-pulses having a duty cycle that is less than 50% over a selected effective pulse duration and a periodicity that is less than the thermal relaxation time of a targeted structure; and
a light delivery system that transmits the laser light output pulse to the tissue of the patient. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for treating biologic tissue with pulse light, comprising:
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generating a long effective output light pulse comprising a series of sub-pulses having a duty cycle that is less than 50% over a selected effective pulse duration and a periodicity that is less than the thermal relaxation time of a targeted structure; and
delivering the pulse light to the tissue of a patient.
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24. A system for treating biologic tissue, comprising:
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a pulse light source for generating a long effective output light pulse comprising a series of sub-pulses having a duty cycle that is less than 50% over a selected effective pulse duration and a periodicity that is less than the thermal relaxation time of a targeted structure; and
a light delivery system that transmits the pulse light to the tissue of a patient.
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25. A method for treating biologic tissue with pulse light, comprising:
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generating a long effective output light pulse comprising a series of sub-pulses having a fractional duty cycle over a selected effective pulse duration, a periodicity that is less than the thermal relaxation time of a targeted structure, and an interpulse-delay between successive sub-pulses that is greater than the thermal relaxation time of non-targeted structures within the treatment area; and
delivering the output light to the tissue of a patient wherein the duty cycle of the sub-pulses is less than 50%.
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26. A system for treating biologic tissue, comprising:
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a pulse light source for generating a long effective output light pulse comprising a series of sub-pulses having a fractional duty cycle over a selected effective pulse duration, a periodicity that is less than the thermal relaxation time of a targeted structure, and an interpulse-delay between successive sub-pulses that is greater than the thermal relaxation time of non-targeted structures within the treatment area; and
a light delivery system that transmits the pulse light to the tissue of the patient, wherein the duty cycle of the sub-pulses is less than 50%.
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Specification