# US 11,439,463 B2 · Laser system with controlled firing of cooling agent and laser based on applicator position > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,439,463 B2 - Document ID: US11439463B2 - Status: Granted - Kind: B2 - Application number: 16/395,291 - Filed: 2019-04-26 - Published: 2020-10-29 - Granted: 2022-09-13 - Earliest claimed: 2019-04-26 - Assignees: Candela Corporation - Applicants: Candela Corporation - Inventors: Kevin Schomacker - Web page: https://patentgrep.com/patent/US11439463B2 ## CPC - A61B 18/22: the beam being directed along or through a flexible conduit, e.g. an optical fibre; {Couplings or} hand-pieces therefor - A61B 18/203: {applying laser energy to the outside of the body} - A61B 90/06: {Measuring instruments not otherwise provided for} - A61N 5/0616: {Skin treatment other than tanning} - A61N 5/067: using laser light - A61B 2017/00039: {Electric or electromagnetic phenomena other than conductivity, e.g. capacity, inductivity, Hall effect} - A61B 2017/00075: {Motion} - A61B 2018/00017: {with gas} - A61B 2018/00029: {open} - A61B 2018/0047: {Upper parts of the skin, e.g. skin peeling or treatment of wrinkles} - A61B 2018/00476: {Hair follicles} - A61B 2018/00642: {with feedback, i.e. closed loop control} - A61B 2018/00928: {by sending a signal to an external energy source} - A61B 2018/202: {Laser enclosed in a hand-piece} - A61B 2018/205545: {Arrangements for particular spot shape, e.g. square or annular} - A61N 2005/007: {for cooling the patient} - A61N 2005/0626: {Monitoring, verifying, controlling systems and methods} - A61N 2005/0644: {Handheld applicators} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - A61N: ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY (measurement of bioelectric currents A61B; surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body A61B18/00; anaesthetic apparatus in general A61M; incandescent lamps H01K; infrared radiators for heating H05B) ## Abstract A laser system includes a base unit having a power source. A hand-held applicator is connected with the base unit configured to engage biological tissue for treatment. Position detection structure is associated with the applicator for determining a position of the applicator relative to the engaged biological tissue. A laser source generates a laser beam. A cooling system provides a cooling agent to the biological tissue during treatment. A processor circuit is connected with the position detection structure, the laser source and the cooling system. Based on data received from the position detection structure, the processor circuit triggers application of the cooling agent to the treated biological tissue, or triggers application of the cooling agent to the treated biological tissue, followed by a time delay, and then triggers the laser source. ## Claims ### Claim 1 A laser system comprising: a base unit having a power source, a hand-held applicator connected with the base unit and constructed and arranged to engage biological tissue for treatment, position detection structure associated with the applicator constructed and arranged to determine displacement of the applicator as the applicator is moved along the engaged biological tissue, a laser source constructed and arranged to generate laser beam, a cooling system constructed and arranged to provide a source of cooling agent to the biological tissue during treatment, and a processor circuit connected with the position detection structure, the laser source, and the cooling system, wherein, based on the displacement received from the position detection structure and on a width of the laser beam as measured in the direction of displacement of the applicator, the processor circuit is constructed and arranged to trigger application of the cooling agent to the treated biological tissue, followed by a time delay, and then to trigger the laser source. ### Claim 2 (depends on 1) The system of claim 1, wherein the laser source, cooling system and processing circuit are housed in the base unit. ### Claim 3 (depends on 1) The system of claim 1, wherein the laser source and cooling system are housed in the base unit and wherein the processor circuit is housed in the applicator. ### Claim 4 (depends on 1) The system of claim 1, wherein the position detection structure comprises a magnetic roller and a magnetic field sensor associated with the magnetic roller and constructed and arranged to detect phase changes as the magnetic roller rotates. ### Claim 5 (depends on 4) The system of claim 4, wherein the magnetic field sensor comprises at least one Hall-effect sensor. ### Claim 6 (depends on 5) The system of claim 5, wherein the processor circuit is constructed and arranged to convert phase changes counted by the Hall-effect sensor to a displacement value of the magnetic roller. ### Claim 7 (depends on 6) The system of claim 6, wherein the processor circuit includes a trigger circuit constructed and arranged to cause the trigger of the cooling agent and the laser source based on the displacement of the magnetic roller. ### Claim 8 (depends on 7) The system of claim 7, wherein the applicator includes a spray valve constructed and arranged to be triggered between open and closed positions by the trigger circuit to deliver the cooling agent from the cooling system. ### Claim 9 (depends on 6) The system of claim 6, wherein the processor circuit is constructed and arranged to execute the following formula: Displacement ⁢ ⁢ ( d ) = number ⁢ ⁢ of ⁢ ⁢ phase ⁢ ⁢ changes ⁢ ⁢ ( N pc ) × roller ⁢ ⁢ circumference ⁢ ⁢ ( π ⁢ ⁢ D ) 2 d = N pc × π ⁢ ⁢ D 2 . where D is the diameter of the magnetic roller. ### Claim 10 (depends on 1) The system of claim 1, wherein the laser source is a 755 nm Alexandrite laser; a semiconductor diode laser operated around 800 nm; a 1064 nm Nd:YAG laser; a 532 nm KTP laser; or a dye laser operated at 585 nm or 595 nm. ### Claim 11 (depends on 1) The system of claim 1, wherein the laser source is constructed and arranged to generate successive laser beams that are adjacent and touching with no overlap, with the displacement being equal to the laser beam width. ### Claim 12 (depends on 1) The system of claim 1, wherein the laser source is constructed and arranged to generate successive laser beams that are adjacent and overlap, with the displacement being 80% of the laser beam width. ### Claim 13 A laser system comprising: a base unit having a power source, a hand-held applicator connected with the base unit and constructed and arranged to engage biological tissue for treatment, position detection structure associated with the applicator constructed and arranged to determine a distance traveled of the applicator as the applicator is moved along the engaged biological tissue, a cooling system constructed and arranged to provide a source of cooling agent to the biological tissue during treatment, and a processor circuit connected with the position detection structure and the cooling system, wherein, based on the distance traveled of the applicator as received from the position detection structure, the processor circuit is constructed and arranged to trigger application of the cooling agent to the treated biological tissue. ### Claim 14 (depends on 13) The system of claim 13, wherein the hand-held applicator includes a spray valve constructed and arranged to supply the cooling agent once the spray valve is triggered by the processor circuit. ### Claim 15 (depends on 14) The system of claim 14, wherein the processor circuit is constructed and arranged to trigger the spray valve to supply the cooling agent for 10 to 100 ms. ### Claim 16 (depends on 15) The system of claim 15, wherein the cooling agent is a cryogen gas. ### Claim 17 (depends on 13) The system of claim 13, wherein the position detection structure comprises a magnetic roller and a magnetic field sensor associated with the magnetic roller and constructed and arranged to detect phase changes as the magnetic roller rotates.