Method of using a cordless medical laser to cure composites and sterilize living tissue

• US 6,099,520 A
• Filed: 06/30/1998
• Issued: 08/08/2000
• Est. Priority Date: 06/10/1997
• Status: Expired due to Fees

• Current Assignee: Yutaka Shimoji
• Original Assignee: Yutaka Shimoji
• Inventors: Shimoji, Yutaka
• Primary Examiner(s): Dvorak, Linda C. M.
• Assistant Examiner(s): YARNELL, BRYAN KEITH
• Application Number:
  US09/107,623
• Time in Patent Office: 770 Days
• Field of Search: 606/2, 606/3, 606/8-10, 606/13-18, 607/89, 607/90, 607/93, 607/94, 433/29-31, 433/215, 433/221, 433/226, 433/228.1, 250/455.11
• US Class Current: 606/2
• CPC Class Codes: A61B 18/201 with beam delivery through a hollow tube, e.g. forming an articulated arm through a flexible conduit A61B18/22; Hand-pieces therefor
• CPC Class Codes: A61C 1/0046 Dental lasers surgical lasers A61B18/20; working by laser beam in general B23K26/00; lasers per se H01S3/00
• CPC Class Codes: A61C 19/004 Hand-held apparatus, e.g. guns
• CPC Class Codes: A61C 2204/002 using batteries
• CPC Class Codes: B23K 26/0096 Portable laser equipment, e.g. hand-held laser apparatus surgical laser instruments A61B18/20, Dental Lasers A61C1/0046, Hand-held laser dental apparatus for curing resins A61C19/004

Abstract

A controlled process for thoroughly curing light-activated surgical and dental composites and a process for tissue sterilization is presented using a hand-held, self-contained, cordless, rechargeable laser instrument. At least one solid state microchip laser is pumped by at least one diode laser to generate blue laser light of at most 480 nm. Q-switched, pulsed laser light output enhances efficiency and control of the curing. Another microchip laser within the instrument generates 210-360 nm wavelength of UV laser light for the sterilization process which differentially kills micro-biological life forms contaminating a repair site without killing healthy tissue. The process of use includes switching from sterilization mode to curing mode of operation of the instrument to save time during surgical and dental procedures.

Claims

1. A method of using a diode pumped solid state laser generation instrument for curing photo-polymerizable composite materials and for sterilization of living biological tissue useful in surgery, dentistry, and medicine comprising the steps of:

exposing a biological tissue site to be sterilized sufficiently so that a directed laser light can illuminate said site;

generating a divergent beam of a UV wavelength laser light of a single selected wavelength within a hand-held, self-contained, diode pumped solid state laser generation instrument by pumping a first chosen solid state laser microchip with a diode laser and by passing said laser light generated from said microchip through a lens;

directing said divergent beam onto a biological living tissue site to be sterilized for a sufficient time to kill micro-biological life forms contaminating said site, the wavelength of said light emitted from said first chosen microchip being at most 360 nm and selected to be the maximum absorption wavelength of the contaminating life forms;

placing a quantity of a chosen photo-polymerizable medical composite material at a site of repair, said quantity being sufficient to effect repair;

switching said instrument to a curing mode of operation by a switching means to activate pumping of at least a second chosen solid state laser microchip within said instrument;

generating and focusing a single band blue wavelength laser light beam of a selected wavelength in said instrument and passing said light beam through a focusing lens, said selected wavelength generated by said second chosen microchip being at most 480 nm;

directing the focused single band wavelength laser light from said instrument into said material for a sufficient time to effect curing of said material, said wavelength being selected to be the maximum absorption wavelength of said chosen composite material.

2. The method according to claim 1 wherein the step of directing said laser light into said material is done by first placing the focal point of said focused laser light at a biological tissue interface with said material and then by moving said focal point from said interface in a direction toward the surface of said material distal to said interface and by ending at said surface distal to said interface, such that said material is cured at said interface initially and at said surface lastly.

3. The method according to claim 1 wherein the said instrument comprises a pumping diode laser housed together with said first and said second chosen microchips and with a rechargeable diode laser power supply.

4. The method according to claim 3 wherein said laser light is Q-switched, pulsed laser light, the maximum power of said laser light is adjusted to the requirements of the targeted substance.