JPH03141943A - Light radiating device - Google Patents

Abstract

PURPOSE:To make an output of light accurately and stably detectable in an actual treated location by detecting the output of laser light in a position closest and opposed to a treatment location of an eye to be examined. CONSTITUTION:A laser light source 200 radiates laser light 250 to a treatment location Ef of an eye E to be examined for treatment. An optical system for reaching a projection lens 106 from an optical fiber 101 guides the above described laser light to the treatment location. A scanning unit 107 as a dividing optical member, for guiding partly the laser light from the optical system to a branch optical path, is opposed arranged to the treatment location of the eye to be examined and a light receiving element 108 as a detecting element, arranged on the outside of the bed seat 107a, detects an output of laser light passed by the dividing optical member. Accordingly, since the output of the laser light can be detected in the scanning unit 107 placed in an opposed position most adjacent to the treatment location of the eye to be examined the output of the actually radiated laser light can be accurately and stably detected.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a light irradiation device that performs treatment by irradiating a therapeutic laser beam onto a treatment area of a subject.

As a conventional light irradiation device, for example, in a laser photocoagulation device, the output of laser light is detected by a light output detection unit 8 of a laser light guide section 2 disposed in a main body 1 shown in FIG. The laser beam guide section 2 includes, for example, a laser tube 3 that generates a laser beam 7, a condenser lens 4, a beam sampler 5, a light receiving element 6, and the like.

On the other hand, a light output detection unit 12 is connected via an optical fiber 16 to an apparatus main body 11 of another conventional example shown in FIG. This unit 12 includes a prism 13 and a light receiving element 1.
4. It has a projection lens 15 and detects the output of the laser beam 17.

Problem to be Solved by the Invention However, in such a laser photocoagulation device, dirt or misalignment of the optical element located between the position of the light receiving element that detects the laser beam and the treatment area (i.e. (The term "misalignment" here refers to a vertical deviation of the optical axis of the lens) causes a difference between the actual light output reaching the treatment area and the light output already detected by the light receiving element.

For this reason, the actual light output of the laser beam at the treatment site cannot be accurately and stably detected by the light receiving element. For example, in FIG. 4, there is a misalignment of the condenser lens 4, and in FIG. 5, there is dirt on the projection lens 15.

OBJECTS OF THE INVENTION An object of the present invention is to provide a light irradiation device that solves the above problems and enables accurate and stable detection of light output at an actual treatment site.

SUMMARY OF THE INVENTION The gist of the present invention is a light irradiation device as set forth in the claims.

Means to solve problems Please refer to FIGS. 1 and 2.

The laser light source 200 irradiates laser light 250 to treat the treatment area Ef of the eye E to be examined.

Optical systems 101 to 106 guide laser light from laser light source 200 to treatment area Ef.

The scanning unit 107 as a splitting optical member is
In order to guide a part of the laser light guided by the optical system to a branched optical path, it is arranged opposite to the treatment area of the eye E to be examined.

A light-receiving element 108 serving as a detection element detects the output of the laser beam transmitted by the splitting optical member.

The output of the working laser beam is detected using the optical element closest to the treatment area Ef of the eye E.

Example The present invention will be described in detail below with reference to the drawings.

In FIG. 1, a laser photocoagulation device is shown as an example of the light irradiation device according to the present invention.

In the illumination optical system of this apparatus, an irradiation unit 21 for illuminating the eye E to be examined can be rotated around a vertical axis AI by an arm 22. On this vertical axis A1, there is a microscope section 23 for magnifying observation of the treatment area E1 of the eye E.
is also rotatably mounted via another arm 24.

[Irradiation Unit 21] The irradiation unit 21 is roughly divided into an observation illumination system 30 and a laser irradiation system 100.

The observation illumination system 30 is composed of an illumination lamp 31, a condenser lens 32, a slit diaphragm 33, a projection lens 34, and a reflection mirror 35, similar to the illumination system of a known Goldmann type slit lamp device.

The reflecting mirror 35 has two mirrors 35a and 35b inclined with respect to the illumination optical axis 01.

These mirrors 35a and 35b are arranged at a predetermined interval in the direction of the illumination optical axis 01.

[Laser irradiation system 100] In the laser irradiation system 100, a laser beam 250 from a laser tube 200 is transmitted through an optical fiber 101 and a collimator lens 1.
02, 103, reflection prism 104, zoom lens system 1
05, it is configured to be guided to the eye E to be examined via the projection lens 106 and the scanning unit 107 closest to the eye E to be examined. By each rotation of the scanning unit 107 about the horizontal axis A2 and the vertical axis A3, the laser beam 250 is irradiated to an arbitrary position of the treatment area E of the eye E.

The double laser irradiation system 100 is shown enlarged in FIG. Components in FIG. 2 denoted by the same numbers as in FIG. 1 indicate the same configurations as in FIG. 1.

In FIG. 2, the scanning unit 107, also called a manipulated mirror, consists of a pedestal 107a and a half mirror 107b attached to the inclined part of the pedestal 107a.
, a light-receiving element 108 disposed outside the pedestal 107a.

A hollow portion 109 is formed in the base 107a, as shown in FIG. This hollow portion 109 is surrounded by the light receiving element 108 and the half mirror 107b. A branched beam 270 obtained by branching the laser beam 250 is guided into the hollow portion 109. This branched light 270 is transmitted to the light receiving element 108
receives light. Note that the light receiving element 108 is, for example, a solar cell.

[Work] The operation of the embodiment will be explained using the above configuration.

Illumination light from the illumination lamp 31 of the observation illumination system 30 in FIG. 1 is condensed by a condenser lens 32. The illumination light flux is focused into a slit shape by a slit diaphragm 33 and passes through a projection lens 34.
The light is further focused.

The illumination light is then reflected by two mirrors 35a and 35b of the reflection mirror 35 spaced apart by a predetermined distance, and is reflected by the pupil E of the eye E to be examined.
p (see FIG. 2) to illuminate the treatment area E of the fundus. This forms a slit illumination portion S. Since the illumination light is turned into a slit-shaped luminous flux by the slit diaphragm 33, the slit-illuminated portion S of the fundus is also formed in a slit-shape as shown.

Laser light 2 from the laser light source 200 is directed onto the treatment site E1 of the fundus of the eye E illuminated by the observation illumination system 30.
50 is fiber I01 and collimator lens 102.1
Guided to 03. The optical axis of the laser beam 250 is changed by the reflection prism 104, magnified by the zoom lens system 105, and condensed by the projection lens 106.

The laser beam 250 is applied to the half mirror 1 of the pedestal 107a of the scanning unit 107 so that the eye E to be examined is irradiated with the laser beam 250.
07b, and irradiates the treatment area E1 of the eye E to be examined.

If the illumination position is shifted vertically or horizontally from the center of the treatment area E, the scanning unit 10
7 is rotated horizontally and vertically to irradiate the laser beam.

When irradiating the treatment area E1 of the eye E with a laser beam, a portion of the laser beam 250 is transmitted by the half mirror 107b of the scanning unit 107 and becomes a branched beam 270. The branched light 270 is transmitted through the light receiving element 10 provided on the pedestal 107a.
Receives light at 8. The light output of the received laser light is detected by the light receiving element 108. The detected output is displayed on the external display panel (
external adjustment switch (not shown)
Adjust the laser output within the laser photocoagulation device body to match the set output via. Alternatively, the laser output is automatically adjusted based on the received output result. Since the optical output of the laser beam can be detected in the scanning unit 107 located closest to the treatment area E of the eye E, the optical output of the actually irradiated laser beam can be accurately and stably detected. be able to.

Incidentally, the light receiving element 108 may be a thermal element or the like in addition to a solar cell. Thermal elements detect light energy and are, for example, thermocouples.

In addition to transmitting light through a half mirror to reach a solar cell or thermal element, it may also be reflected by a light mirror to reach these.

Although the laser photocoagulation apparatus has been described as an example as described above, the present invention is not limited thereto. For example, the present invention can be applied to a dermatological bruise treatment device or a laser processing device.

Effects of the Invention According to the present invention, the optical output of the laser beam can be detected at a position closest to and opposite the treatment site of the eye to be examined. Therefore, a value closer to the actual treatment output can be detected accurately and stably. Moreover, since changes in output can be detected at all times during treatment, it has the effect of preventing erroneous irradiation of laser light and improving the safety of treatment.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing a laser photocoagulator which is an example of the light irradiation device of the present invention, FIG. 2 is an enlarged schematic perspective view of the laser irradiation system in the illumination optical system of FIG. 1, and FIG. 3 1 is a sectional view of a scanning unit in a laser irradiation system, and FIGS. 4 and 5 are schematic views of a conventional laser photocoagulation apparatus. 2■・・・・・・・・・・・・・・・Irradiation section 30
・・・・・・・・・・・・・・・ Observation illumination system 10
0...... Laser irradiation system 101
・・・・・・・・・・・・・・・Optical fiber 102.1
03... Collimator lens 104...
...Reflection prism 105...
...Zoom lens 106...
...Projection lens 0 0 0 0 p I 7 ...... Scanning unit 7a ...... Pedestal 7b ... ...Half mirror 8...
......... Light receiving element Eye to be examined ......... Pupil...
・・・・・・・・・Treatment area slit illumination part

Claims (1)

[Scope of Claims] A laser light source that irradiates laser light to treat a treatment site of an eye to be examined; an optical system that guides laser light from the laser light source to the treatment site; and a laser beam guided by the optical system. A splitting optical member disposed facing the treatment area to guide a part of the light to a branched optical path, and a detection element arranged on the branched optical path formed by the splitting optical member to detect the output of the laser light. A light irradiation device comprising: