JPS6156662A - Laser treatment apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is mainly used for ophthalmic surgery, and in particular for treatment.
The present invention relates to a laser treatment device that uses invisible light such as an AG laser and separately uses visible light for aiming.

[Prior Art] For example, in an ophthalmic laser treatment device that uses a YAG laser, the YAG laser is expanded by a -H beam expander and then focused on a specific area for treatment. Since this is invisible light, an aiming beam using another visible light is required for focusing. A He--Ne laser is generally used as this aiming light, and is introduced into the same optical path as the YAG laser by means of a guichroic mirror.

When focusing using this aiming light, the therapist must move the treatment device back and forth with respect to the treatment while looking at the aiming light through the finder.
A large device equipped with both an AG laser light source and a He-Ne laser light source for aiming has a problem in that aiming operations are difficult.

CObject of the Invention] An object of the present invention is to reduce the size and weight of the treatment device main body by installing an aiming laser light source outside the treatment device main body via an optical fiber, in order to improve the above-mentioned problems.
An object of the present invention is to provide a laser treatment device with improved operability of aiming light.

[Summary of the Invention] The gist of the present invention to achieve the above-mentioned object is to provide a treatment apparatus that uses a visible light aiming laser light source in addition to a treatment laser light source, and which is capable of moving with respect to the eye to be examined. A light splitting member is arranged in the optical path of the main body including the laser light source, and from the aiming laser light source fixedly placed outside the main body, the aiming light is transmitted to the therapeutic laser via the optical fiber and the light splitting member. This is a laser treatment device characterized by being introduced into the optical path.

[Embodiments of the invention] The present invention will be explained in detail based on illustrated embodiments.

FIG. 1 is an overall optical layout diagram showing an embodiment of the present invention, where S indicates a treatment area and E indicates a treated presbyopia.

In FIG. 1, a laser beam emitted from a therapeutic YAG laser light source 1 is once expanded by a beam expander made up of lenses 2 and 3, then reflected by a light splitting member 4, and passed through an objective lens 5. The light is focused on the treatment area S. A lens 6.7 arranged coaxially with the objective lens 5 is a finder optical system.
The treatment device main body 8 including each member 7 is placed in the pulse therapy field S when aiming.
It is now possible to move against.

Here, the aiming laser light source 9 is installed outside the treatment device main body 8 and is connected to the treatment device main body 8 via an optical fiber 10. The output end 10a of this optical fiber 10 is placed near the light splitting member 11 provided on the lens 2.31Jl, and is located at a position conjugate with the focal point P of the therapeutic laser beam via the light splitting member 11. It is provided.

Therefore, the aiming light emitted from the aiming laser light source 9 is guided to the optical fiber 10 and emitted from the output end 10a, enters the treatment area S through the same optical path as the therapeutic laser, and enters the treatment area S through the lens 6. It is observed by the treated presbyopic E through a finder optical system composed of 7, and the patient moves the treatment device main body 8 to adjust the aim so that the treatment device main body 8 is in an appropriate position.

After aiming is completed, a laser beam is emitted from the therapeutic laser light source 1 to treat the treatment area S. Note that if the beam expander is a combination of a concave lens and a convex lens, the focal point P is a virtual image. Therefore, this and the output end 10a may be arranged conjugately.

[Effects of the Invention] As explained above, the laser treatment device according to the present invention uses one of the two laser light sources for treatment and aiming;
That is, since the aiming laser light source can be placed outside the treatment device main body, the treatment device main body that is moved during aiming can be significantly reduced in size and weight, which has the advantage of making aiming operations easier. Also, the aiming laser light source can be installed outside the treatment device itself.

Since the aiming laser beam can be guided to the treatment area through a flexible optical fiber without any problem, the same aiming function as before can be obtained. Furthermore, by making the position of the output end of the optical fiber conjugate with the focal point of the therapeutic laser beam, aiming at the treatment area can be reduced. Moreover, by arranging the light splitting member within the beam expander in the optical path of the therapeutic laser, there is no need for a lens that converts the light from the fiber output end into a parallel beam, which is required when the member is arranged outside the beam expander.

[Brief explanation of the drawing]

FIG. 1 is an optical layout diagram showing an embodiment of the laser treatment device according to the present invention. 1 is a therapeutic laser light source, 2.3 is a lens constituting a beam expander, 4.11 is a light splitting member, 5 is an objective lens, 8 is a treatment device, 9 is an aiming laser light source, 1
0 is an optical fiber, and 10a is an output end. Patent applicant: Canon Co., Ltd. Drawing 1

Claims (1)

[Claims] 1. In a treatment device that uses a visible light aiming laser light source in addition to a treatment laser light source, light is split into an optical path of a main body that includes a treatment laser light source that is movable with respect to the eye to be examined. A member is arranged so that aiming light is introduced from the aiming laser light source fixedly placed outside the main body into the therapeutic laser light path via the optical fiber and the light splitting member. Laser treatment device. 2. The laser treatment device according to claim 1, wherein the position of the output end of the optical fiber is conjugate with the focal point of the treatment laser beam. 3. The laser treatment apparatus according to claim 1, wherein the light splitting member is disposed within a beam expander in a treatment laser optical path.