Light radiating device

Patent metadata

Field	Value
Publication number	US-12402944-B2
Application number	US-201917261789-A
Country	US
Kind code	B2
Filing date	Jul 19, 2019
Priority date	Jul 20, 2018
Publication date	Sep 2, 2025
Grant date	Sep 2, 2025

Abstract

A light radiating device ( 1 A) performs solidification or cauterization of a biological tissue (PL) by radiating a light beam (BM). A light source ( 10 A) emits the light beam (BM). An optical waveguide ( 20 A) is a member being provided with a reflection surface ( 21 A) totally reflecting the light beam (BM) on an inner circumferential side wall, causing the light beam (BM) emitted from the light source ( 10 A) to enter a part enclosed by the inner circumferential side wall from one end, and sending the light beam (BM) to the other end. A catoptric system ( 30 A) reflects the light beam (BM) sent to the other end of the optical waveguide ( 20 A) and condenses the light beam (BM) on the biological tissue (PL).

First claim

The invention claimed is:

1. A light radiating device performing solidification or cauterization of a radiation target by radiating a light beam, the light radiating device comprising:
a light source emitting the light beam;
an optical waveguide including a tubular hollow member having an inner circumferential side wall extending between a first end and a second end along a first optical axis and provided with a first reflection surface including a metal material film formed on the inner circumferential side wall totally reflecting the light beam, causing the light beam emitted from the light source to enter a part enclosed by the inner circumferential side wall from the first end, and sending the light beam to the second end along the first optical axis; and
a catoptric system reflecting the light beam sent to the second end of the optical waveguide and condensing the light beam on the radiation target;
wherein the catoptric system includes a second reflection surface having two different sectional shapes including:
a first sectional shape defined along a first axis and including a concave elliptical am defined by an ellipse having a major axis defined along the first optical axis and configured to condense light rays entering each point on the concave elliptical arc onto a focus of the concave elliptical arc defined along a second optical axis orthogonal to the first optical axis; and
a second sectional shape defined along a second axis perpendicular to the first axis and including a concave circular arc including a radius such that light rays entering each point on the concave circular arc are condensed onto the focus of the concave elliptical arc defined along the second optical axis;
wherein the optical waveguide is configured to reflect a light ray along the first optical axis at a first reflected position along the inner circumferential side wall and at a second reflected position along the inner circumferential side wall after being reflected at the first reflected position at a maximum emission angle of 30 degrees; and
wherein the light radiating device includes a length defined between the light source and an incidence position defined on the second reflection surface of the catoptric system of a light ray entering along the first optical axis of the optical waveguide that is equal to four times a distance defined between the first reflected position and the second reflected position.

2. The light radiating device according to claim 1 , wherein the second reflection surface of the catoptric system includes a metal film deposited on an enclosure.

3. The light radiating device according to claim 2 , wherein the enclosure is formed of metal or resin.

4. The light radiating device according to claim 2 , wherein the metal film is aluminum.

5. The light radiating device according to claim 1 , wherein a film made up of silicon dioxide is formed on a surface of the metal material film.

6. The light radiating device according to claim 5 , wherein a thickness of the film made up of silicon dioxide is ¼ of a wavelength of a part of one or more light rays included in the light beam emitted from the light source.

7. The light radiating device according to claim 1 , wherein the inner circumferential side wall is formed in a prismatic shape in the optical waveguide.

8. The light radiating device according to claim 1 , wherein a heat insulating part is provided on an outer periphery of the optical waveguide and the catoptric system.

9. The light radiating device according to claim 8 , wherein the heat insulating part includes:
an exterior cover enclosing an outer periphery of the optical waveguide and the catoptric system; and
a spacer inserted between the optical waveguide and the catoptric system, and the exterior cover in order to provide a gap between the optical waveguide and the catoptric system, and the exterior cover.

10. The light radiating device according to claim 9 , wherein, on the spacer, a plurality of projections is provided on at least one of a part facing the optical waveguide and the catoptric system, and a part facing the exterior cover.

11. The light radiating device according to claim 1 , wherein a size of the second reflection surface of the catoptric system when the second reflection surface is viewed from a direction of the first optical axis of the optical waveguide is equal to or greater than a size of a section of the light beam entering the catoptric system from the optical waveguide.

12. The light radiating device according to claim 1 , wherein the light beam emitted from the light source includes an infrared radiation.

13. The light radiating device according to claim 12 , wherein the light source is one of a halogen lamp, a xenon lamp, an infrared heater, and an infrared laser.

Assignees

• Neuroceuticals Inc
• I Pex Inc
• Neurolightech Inc

Inventors

• Shimizu Kazuo
• Goto Yoichi
• Matsumoto Toshifumi
• Kawamura Shoichi

Classifications

• G02B6/262

  Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements · CPC title

• A61B2018/2255

  Optical elements at the distal end of probe tips · CPC title

• A61B2018/00595

  Cauterization · CPC title

• A61B2018/00101

  low, i.e. thermally insulating · CPC title

• G02B5/10

  with curved faces · CPC title