US6015404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser dermatology with feedback control
Assignee: Palomar Medical Technologies LLC
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Filing: 1996-12-02
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Granted: 2000-01-18
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Expires: 2016-12-02
Abstract
Abstract Method and apparatus are provided for use with systems applying laser energy to treat a selected dermatology problem. The method and apparatus protect skin not under treatment in skin regions affected by the laser by detecting, with a suitable sensor, at least a selected parameter in the skin region affected by the delivered laser energy and performing a control function to effect the desired protection by use of a feedback mechanism which is operative in response to an output from the sensor. For some embodiments, two laser pulses may be utilized, which pulses are spaced by a time which is preferably greater than the thermal relaxation time for affected regions not under treatment, for example an epidermis through which the energy is passed to an area under treatment, but is less than the thermal relaxation time of the area under treatment. The first of the pulses serves as a prediagnosis pulse which is clearly below the damage threshold for protected areas, with the sensor output for the first pulse being utilized to control at least one parameter of the second pulse.
Inventors
- 👤 Gregory Altshuler
- 👤 Andrei V. Erofeev
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:55
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/18; A61B18/20; A61B18/203; A61B17/00; A61B2017/00017; A61B2017/00022; A61B2017/00057; A61B2017/00106; A61B2018/00005; A61B2018/00315; A61B2018/00452; A61B2018/00476
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
150 words
In a system for using a laser to treat a selected problem in a region at a selected depth in a patient's skin, a mechanism for reducing damage to the patient's epidermis overlying such region comprising: a sensor for detecting at least a selected parameter of the patient's skin; a feedback mechanism operative in response to an output from said sensor for performing a control function which protects said overlying epidermis from damage; and means for delivering two laser pulses to said region through said overlying epidermis, said pulses being spaced by a time related at least to the thermal relaxation time of the patient's epidermis, the first of said pulses being a prediagnosis pulse which is below a damage threshold for the patient's epidermis, the feedback mechanism being operative in response to the sensor output for said first pulse for controlling at least one parameter of the second pulse.
Claim 2
Dependent Claim
150 words
In a system for using a laser to treat a selected problem in a region at a selected depth in a patient's skin, a mechanism for reducing damage to the patient's epidermis overlying such region comprising: a sensor for detecting at least a selected parameter of the patient's skin; a feedback mechanism operative in response to an output from said sensor for performing a control function which protects said overlying epidermis from damage; and means for delivering two laser pulses to said region through said overlying epidermis, said pulses being spaced by a time related at least to the thermal relaxation time of the patient's epidermis, the first of said pulses being a prediagnosis pulse which is below a damage threshold for the patient's epidermis, the feedback mechanism being operative in response to the sensor output for said first pulse for controlling at least one parameter of the second pulse.
Claim 3
Dependent Claim
25 words
A mechanism as claimed in claim 1, wherein the at least one parameter controlled includes at least one of laser intensity, fluence and pulse duration.
Claim 4
Dependent Claim
32 words
A mechanism as claimed in claim 1, wherein said feedback mechanism is operative in response to sensor outputs for said second pulse for controlling at least one parameter of said second pulse.
Claim 5
Dependent Claim
139 words
In a system for using a laser to treat a selected problem in a region at a selected depth in a patient's skin, a method for reducing damage to the patient's epidermis overlying such region comprising: detecting at least a selected parameter of the patient's skin; performing a control function to protect said overlying epidermis from damage in response to an output from said sensor; and delivering two laser pulses to said region through said overlying epidermis, which pulses are spaced by a time related at least to the thermal relaxation time of the patient's epidermis, the first of said pulses being a prediagnosis pulse which is below a damage threshold for the patient's epidermis, the control function utilizing the detected at least selected parameter for said first pulse to control at least one parameter of the second pulse.
Claim 6
Dependent Claim
139 words
In a system for using a laser to treat a selected problem in a region at a selected depth in a patient's skin, a method for reducing damage to the patient's epidermis overlying such region comprising: detecting at least a selected parameter of the patient's skin; performing a control function to protect said overlying epidermis from damage in response to an output from said sensor; and delivering two laser pulses to said region through said overlying epidermis, which pulses are spaced by a time related at least to the thermal relaxation time of the patient's epidermis, the first of said pulses being a prediagnosis pulse which is below a damage threshold for the patient's epidermis, the control function utilizing the detected at least selected parameter for said first pulse to control at least one parameter of the second pulse.
Claim 7
Dependent Claim
31 words
A method as claimed in claim 4, wherein the control function includes controlling the laser energy delivered to said region by said second pulse so as to minimize potential epidermal damage.
Claim 8
Dependent Claim
25 words
A method as claimed in claim 4, wherein the at least one parameter controlled includes at least one of laser intensity, fluence and pulse duration.
Claim 9
Dependent Claim
39 words
A method as claimed in claim 4, wherein said control function is also operative in response to a selected parameter detected during said detecting step for said second pulse for controlling at least one parameter of said second pulse.
Claim 10
Dependent Claim
35 words
A method as claimed in claim 4, including the step of applying a cooling spray to said overlying epidermis, said step being in response to an indication during said detecting step of potential epidermal damage.
Claim 11
Dependent Claim
44 words
A method as claimed in claim 4, wherein during said detection step for said second pulse, an indication that treatment of the problem is complete is detected, and wherein said control function terminates delivery of laser energy in response to a treatment complete indication.
References Cited (Backward Citations)
US5140984A
Cited
US5137530A
Cited
DE3837248A1
Cited
US5348551A
Cited
US5057104A
Cited
US5071417A
Cited
US5207671A
Cited
US5344418A
Cited
US5334191A
Cited
US5334193A
Cited
US5350376A
Cited
US5415654A
Cited
WO1996025979A1
Cited
EP0755698A2
Cited
US5782249A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2003-01-17 | 2003-07-19 | 2004-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-01-17 | 2007-07-19 | 2008-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-01-17 | 2011-07-19 | 2012-01-18 | $7700.00 | Window Closed / Lapsed |