Treatment beam handpiece

• US 5,628,744 A
• Filed: 12/21/1993
• Issued: 05/13/1997
• Est. Priority Date: 12/21/1993
• Status: Expired due to Term

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Laserscope (Endo International PLC)
• Inventors: Davenport, Scott A., Coleman, Tony D.
• Primary Examiner(s): Sykes, Angela D.
• Assistant Examiner(s): PEFFLEY, MICHAEL F
• Application Number:
  US08/171,593
• Time in Patent Office: 1,239 Days
• Field of Search: 606/2, 606/3, 606/7, 606/9, 606/10-13, 606/17, 607/88, 607/89
• US Class Current: 606/12
• CPC Class Codes: A61B 18/20 using laser
• CPC Class Codes: A61B 18/203 applying laser energy to the outside of the body
• CPC Class Codes: A61B 2017/00057 Light
• CPC Class Codes: A61B 2017/00747 Dermatology
• CPC Class Codes: A61B 2018/00452 Skin
• CPC Class Codes: A61B 2018/00476 Hair follicles
• CPC Class Codes: A61B 2018/00666 using a threshold value
• CPC Class Codes: A61B 2018/00904 Automatic detection of target tissue
• CPC Class Codes: A61B 2018/2025 with a pilot laser

Abstract

A dermatology handpiece delivers a treatment beam of optical energy to a lesion. The handpiece has the ability to selectively determine whether or not the treatment beam is delivering optical energy to a lesion or to healthy tissue. This is achieved without visual inspection of the skin surface by the physician. Slight variations in tissue, not readily discernable by the human eye, can be detected and treated. A base line, or threshold, is established for the treatment area. Normal tissue, falling below the base line, does not receive a dose of optical energy. A threshold or base line signal is created by taking a reading of healthy skin. The dermatology handpiece is adjusted so that the treatment beam is not delivered until a threshold or base line signal is exceeded. Substantially all of a lesion receives the proper amount of optical energy in the treatment beam, while healthy tissue does not receive a dosage of optical energy.

Claims

1. A dermatological treatment system for delivering a treatment beam to a dermatological treatment site, comprising in operative combination:

a) a handpiece having a housing;

b) a first substantially monochromatic optical energy source to provide a treatment beam having a first wavelength and intensity sufficient to treat dermatologic lesions and other abnormalities;

c) a second substantially monochromatic optical energy source to generate a probe beam having a second wavelength appropriate to detect dermatologic lesions and other abnormalities as characterized by differences in reflected light intensity when said probe beam is reflected from such lesions and other abnormalities as compared to normal skin tissue, said probe beam and treatment beam able to operate simultaneously;

e) an optical delivery device having an output end positioned in the housing, the optical delivery device optically connected to said first optical energy source for receiving the treatment beam from said first optical energy source and conducting said treatment beam toward said treatment site;

f) said optical delivery device is optically connected to said second optical energy source for receiving said probe beam from said second optical energy source and conducting said probe beam toward said treatment site, said probe beam impinging on an area substantially coincident with said treatment beam; and

g) a treatment beam selectivity means in cooperative electrical connection with said first optical energy source for identifying dermatological abnormalities by directly detecting variations in intensity of reflected light from said probe beam, comparing the intensity of the reflected light with the predetermined threshold level and enabling or disabling said treatment beam in accordance with a predetermined reflected light threshold level.

2. A dermatological treatment system as in claim 1, wherein the treatment beam selectivity device includes a beam contrast means to determine a difference between the treatment beam and the reflectance beam.

3. A dermatological treatment system as in claim 1, wherein at least one of said first and said second optical sources is a laser diode.

4. A dermatological treatment system as in claim 1, said treatment beam selectivity means includes:

a) a photodetector, for detecting light from said probe beam reflected from said treatment site, to generate a detected reflected light signal;

b) a comparator, responsive to said detected reflected light signal, for measuring a difference between said detected reflected light signal and a predetermined threshold signal level to produce a comparison signal; and

c) a trigger generator, responsive to the comparison signal, the trigger generator being electrically coupled to said first optical energy source and enabling the treatment beam when the comparison signal has a predetermined magnitude.

5. A dermatological treatment system as in claim 4, wherein the detector further comprises an amplifier.

6. A dermatological treatment system as in claim 4, further comprising a threshold signal adjustment device coupled to the comparator.

7. A dermatological treatment system as in claim 4, further comprising an indicator signal device coupled to the trigger generator, the indicator signal device producing a discernable signal indicative of the treatment beam.

8. A dermatological treatment system for treating a dermatological target site, comprising:

a) an optical energy source having at least two different substantially monochromatic wavelengths simultaneously available therefrom, a first wavelength to provide a treatment beam having a wavelength and intensity sufficient to treat dermatologic lesions and other abnormalities, and a second wavelength to provide a probe beam having a wavelength appropriate to detect dermatologic lesions and other abnormalities as characterized by differences in reflected light intensity from such dermatologic lesions or abnormalities as compared to normal skin tissue, said treatment beam being enabled according to the reflected light level of said probe beam;

b) an optical delivery device, coupled to said optical energy source, to deliver said probe beam and said treatment beam to the target site, means in said optical delivery device to direct said probe beam and said treatment beam to be substantially coincident at the dermatological target site;

c) a photodetector, for directly detecting reflected light from said probe beam, to generate a detected reflected light signal;

d) a comparator, responsive to the detected reflected light signal, to measure a difference between the detected reflectance signal and a predetermined threshold signal and produce a comparison signal; and

h) a trigger generator in cooperative electrical connection with said optical energy source, responsive to the comparison signal to produce a treatment signal when the comparison has a predetermined magnitude thereby enabling said optical energy source to produce a treatment beam.

9. A dermatological treatment system for treating a dermatological target site with a treatment beam of optical energy, comprising:

a) a handpiece having a housing;

b) a first substantially monochromatic optical energy source to provide a treatment beam having a wavelength and intensity sufficient to treat dermatologic lesions and other abnormalities;

c) a second substantially monochromatic optical energy source to generate a probe beam having a wavelength appropriate to detect dermatologic legions and other abnormalities as characterized by differences in reflected light intensity when said probe beam is reflected from lesions and other abnormalities as compared to normal skin tissue;

d) a first optical delivery device terminating in said housing and optically connected to said first optical energy source for receiving the treatment beam from said first optical energy source and conducting said treatment beam to the treatment site;

e) a second optical delivery device terminating in said housing and optically connected to said second optical energy source for receiving said probe beam from said second optical energy source and conducting said probe beam to the treatment site, said probe beam impinging on an area of the treatment site substantially coincident to said treatment beam;

f) a photodetector, for directly detecting reflected light from said probe beam, to generate a detected reflected light signal upon detection thereof;

g) a comparator, responsive to the detected reflected light signal, to measure a difference between the detected reflected light signal and a predetermined threshold signal and produce a comparison signal; and

h) a trigger generator in cooperative electrical connection with said first optical energy source, responsive to the comparison signal, to produce a treatment signal when the comparison signal has a predetermined magnitude, thereby enabling said first optical energy source to produce a treatment beam.