JP2518424Y2 - Ophthalmic laser treatment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an ophthalmic laser treatment apparatus used, for example, for the treatment of cataracts and the like.

[Prior Art] Intraocular lens (IOL) transplant surgery is performed for the treatment of cataracts in which the crystalline lens of the eyeball becomes cloudy and the visual acuity deteriorates. There is a secondary cataract as a sequela after this IOL transplant. This post-cataract is the formation of an opaque membrane in the posterior capsule behind the transplanted IOL, which reduces vision.

An ophthalmic laser treatment device has been conventionally used for the treatment of this subsequent cataract. This device irradiates the opaque film formed on the posterior capsule with high-output pulsed light (wavelength: 1064nm) of a YAG (neodymium-yttrium-aluminum-garnet) laser to generate plasma and destroy the opaque film. Is. That is, the YAG laser light is focused on a desired affected area through the objective lens to destroy the affected area. In that case, the setting of the focal point of the YAG laser light to be located at a predetermined affected area has been performed as follows. That is, He-Ne laser light (wavelength: 632.8 nm), which is an aiming light having the same focusing point as the YAG laser light, is applied to the affected area through the objective lens. On the other hand, the aiming light emitted to the affected area through the objective lens through the half mirror is observed with a microscope. Then, the joystick or the like is operated to move the entire apparatus with respect to the affected area so that the spot of the aiming light is minimized at the desired affected area position.
As a result, the focusing point position of the aiming light coincides with the desired affected part position, and as a result, the focusing point position of the YAG laser light is set to the desired affected part position.

By the way, in the above-mentioned device, whether or not the focusing point of the YAG laser light is coincident with the desired affected part position, whether or not the spot diameter of the aiming light is minimized by observing the size of the spot diameter of the aiming light It will be judged by.

However, it requires a great deal of skill to accurately determine whether or not the spot diameter is the minimum with the naked eye. Moreover, even in the case of judgment by a skilled person, it is necessary to repeatedly focus before and after the minimum spot diameter to confirm the minimum spot diameter, so that the operation is complicated.

As an apparatus capable of removing such defects, Japanese Patent Laid-Open No. 60-1
The device described in Japanese Patent No. 68448 is known.

This device splits the He-Ne laser light, which is an aiming light, into two light fluxes by passing them through a light-transmitting parallel plane plate that is obliquely arranged, and focuses these two light fluxes on the affected area through an objective lens. It was done. That is,
When the focal point of the objective lens coincides with the position of the affected area, these two light fluxes are focused on one point. On the other hand, if this is not the case, two spots of two light fluxes are formed on the affected area. Therefore, the operator may determine whether or not there is one spot. This judgment can be clearly made even by a beginner, and the operation is remarkably simple as compared with the case of finding the minimum spot diameter.

[Problems to be Solved by the Invention] By the way, in the above-mentioned conventional device, a translucent parallel plane plate arranged obliquely is used to divide the aiming light into two light beams.

That is, a semi-transmissive film is formed on the surface facing the light incident surface, and this semi-transmissive film transmits part of the incident light and reflects the other part. A part of the reflected light is reflected again by the reflection film formed on the facing surface. The light reflected again is emitted from the facing surface. In this case, the angle of the parallel plane plate with respect to the incident light is appropriately selected, and the light reflected again and emitted from the facing surface and the above-mentioned first transmitted light become two parallel light fluxes.

However, one of the lights separated into the above two light beams passes through the semi-transmissive film and its intensity is reduced to half or less. Further, the intensity of the other light of the two light fluxes becomes half or less when it is reflected by the semi-transmissive film, and then it is reflected by the facing surface to be further weakened. Moreover, it is when the two weak light beams are observed as two spots in the affected area when they are out of focus of the objective lens. For this reason, the brightness of the two spots is weak, it is vague and not always easy to distinguish, and the characteristics of this method may not be fully utilized.

Therefore, in order to take full advantage of this method, it is necessary to use a high-power He-Ne laser device as an aiming light source. The high-power He-Ne laser device
It is extremely expensive, and this greatly increases the cost of the entire apparatus.

The present invention was made under the above-mentioned background.
It is an object of the present invention to provide an ophthalmic laser treatment device capable of quickly and accurately aligning the focal point of a treatment laser beam with a simple aiming operation by using a laser device of relatively small output. is there.

[Means for Solving the Problems] The present invention solves the above problems by adopting the following configuration.

Aiming light consisting of a plurality of parallel light beams is focused on the affected area by a focusing optical system, and the focusing optical system is adjusted so that the spot of the aiming light is focused on one point on the affected area, and then the therapeutic light is applied through this focusing optical system. In an ophthalmic laser treatment apparatus adapted to perform treatment by focusing laser light on an affected part, the light source of the aiming light is arranged at a position deviated from the optical path of the treatment laser light, and the aiming light is used for the treatment laser. Provided in front of the focusing optical system on the path of the therapeutic laser light, a combining means for combining the optical path of the light,
A light beam splitting means having a light blocking portion for blocking a part of one light beam emitted from the light source of the aiming light and splitting the light beam into a plurality of light beams having a plurality of cross sections is combined with the light source of the aiming light. A structure characterized by being provided in the middle of the means.

[Operation] In the above-described configuration, first, the focal point position of the therapeutic laser light and the focal point position of the aiming light are made to coincide with each other.
Set the optical system. Then, if the focusing optical system is adjusted so that the spot of aiming light composed of a plurality of light fluxes is focused on one point at the affected area, the therapeutic laser light can be focused on the affected area through this focusing optical system, and the desired treatment is achieved. It can be performed.

Here, the aiming light is a light blocking portion that splits one light beam emitted from the light source into a plurality of light beams that block a part of the light beam and divide the light beam into a plurality of sections. The light beam is divided into a plurality of light beams by the light beam dividing means. That is, like conventional aiming light, 1
One beam is not split by a semi-transparent film, etc.
By dividing one light flux into a plurality of parts, a plurality of light fluxes are obtained. Therefore, the degree to which the light is attenuated can be reduced as compared with the case of using the conventional light splitting means such as a plane parallel plate. Therefore, even if a laser device or the like having a relatively small output is used as the aiming light source, it is possible to efficiently guide the light from the laser device to a plurality of light fluxes without attenuating the light. Therefore, it is possible to form a plurality of bright and clear spots even when they are out of focus, and clear judgment is possible. That is,
To obtain an ophthalmic laser treatment apparatus capable of quickly and accurately adjusting the focal point of a treatment laser beam by a simple aiming operation while keeping the cost of the entire apparatus low by using a low output and inexpensive laser apparatus. You can

[Embodiment] First Embodiment FIG. 1 is a block diagram showing an overall configuration of an ophthalmic laser treatment apparatus according to a first embodiment of the present invention, and FIG. 2 is a view showing a light beam dividing means of the first embodiment. 2 (a) is a plan view, FIG. 2 (b) is a side view, and FIG. 2 (c) is an operation explanatory view. Hereinafter, with reference to these drawings, the first
Examples will be described in detail.

In the figure, reference numeral 1 is a YAG that generates a therapeutic laser beam.
Laser device, reference numeral 2 is a He-Ne laser device for generating aiming light, reference numeral 10 is a light beam dividing means, reference numeral 3 is a focusing optical system,
Reference numeral 4 is a beam splitter as an optical coupling means, and reference numeral 5
Is a microscope optical system as an observation optical system, reference numeral 6 is an optical system for adjusting the focal point of the treatment laser beam, and reference numeral 7 is an eyeball as a treatment target.

The YAG laser device 1 oscillates a high-power pulsed laser light having a wavelength of 1064 nm that can destroy the affected tissue of the eyeball 7 that is a treatment target.

The He-Ne laser device 2 continuously oscillates laser light having a wavelength of 632.8 nm that can be observed without destroying the affected tissue of the eyeball 7.

The focusing optical system 3 includes a beam expander 31, a half mirror 32, and an objective lens 33.

The beam expander 31 has a concave lens 31a and a convex lens system 3
1b, the beam diameter of the laser beam is expanded (15 times in this embodiment) to facilitate the subsequent processing in the optical system.

Further, the half mirror 32 reflects the laser light whose beam diameter has been expanded by the beam expander 31, changes its direction by 90 °, and makes it enter the objective lens 33.
A part of the light guided through the objective lens 33 is transmitted and introduced into the microscope optical system 5. That is, the wavelength 1064
The YAG laser beam of nm has a 100% reflection, and the He-Ne laser beam of 632.8 nm has a 20% reflection. Objective lens 33
Is a function of focusing the laser light reflected by the half mirror 32 to a desired position of the eyeball 7, and an objective lens when observing the image of the focus point position of the laser light with the microscope optical system 5. It has an action that doubles as an action. Here, the cone angle of this objective lens 33 is
It is 18 ° (full width). In addition, the He-Ne laser light is focused on a point 98.93 mm apart in front of the lens.

The beam splitter 4 introduces the YAG laser light emitted from the YAG laser device 1 and the He-Ne laser light emitted from the He-Ne laser device 2 into the focusing optical system 3.

The microscope optical system 5 uses the objective lens 33 as an objective lens,
Variable magnification optical system (magnification: 0.51x, 0.8x, 1.28x, 2.05x, 3.
2 ×) 51, heat ray absorption filter 52, half mirror 53, naked eye observation system 54 and photograph observation system 55.

The naked eye observation system 54 includes an imaging lens 54a, a Porro prism 54b, and an eyepiece lens (magnification: 12.5 ×) 54c.
An enlarged image of the affected tissue is formed on the observation eye 8. On the other hand, the photographic observation system 55 is composed of an imaging lens 55a and a reflecting mirror 55b,
An enlarged image of the affected tissue of the eyeball 7 is formed on a camera (not shown).

Then, the focusing point position adjusting optical system 6 gives a predetermined focusing action or diverging action to the YAG laser light emitted from the YAG laser device, so that the YAG laser light is focused on the affected tissue of the eyeball 7 by the focusing optical system 3. The position of the focused point to be focused is changed. In other words, the relative positional relationship between the focus point position of the YAG laser light focusing optical system 3 and the focus point position of the He-Ne laser light focusing optical system 3 is changed.

Now, the light beam splitting means 10 splits one light beam emitted from the He-Ne laser device 2 into two to form aiming light composed of two light beams.

As shown in FIG. 2, in the light beam dividing means 10, a V-shaped groove 12 is formed on one surface portion of a substantially rectangular plate-like body 11 so as to vertically cut the central portion of the surface portion. In addition, He-Ne is formed on the surfaces 13 and 14 on both sides of the V-shaped groove 12.
It is provided with a total reflection coating that totally reflects laser light.

As shown in FIG. 2 (c), the light beam dividing means 10 is arranged so that the laser beam L0, which is one light beam emitted from the He-Ne laser device 2, is incident from the 45 degree direction. . Therefore, the laser beam L0, which is one light beam, is totally reflected by the total reflection surfaces 13 and 14 on both sides of the V-shaped groove 11,
As a result, the two light beams L1 and L2 are split and emitted toward the beam splitter 4.

Therefore, by adjusting the converging optical system 3 so that the aiming light composed of these two light fluxes forms one spot on the affected area, the laser light of the YAG laser device 1 is also focused on the affected area, and the treatment is performed. It can be carried out.

According to this embodiment, the aiming light composed of the plurality of light fluxes L1 and L2 is obtained by converting the laser light L0, which is one light flux, into the V-shaped groove 11
Only one total reflection is performed on the total reflection surfaces 13 and 14 on both sides of. Therefore, except for the V-shaped groove 12, it is hardly damped. The V-shaped groove 12 can be made sufficiently small compared to the entire cross-sectional area of the light flux, and can be neglected. Therefore, He as an aiming light source
Even if a Ne laser device 2 having a relatively small output is used, the light from this laser device can be efficiently divided into a plurality of light beams without being attenuated. Therefore, it is possible to form a plurality of bright and clear spots even when they are out of focus, and clear judgment is possible.
That is, it is possible to provide a device that can quickly and accurately adjust the focus point of the therapeutic laser light by a simple aiming operation while keeping the cost of the entire device low by using a low output and inexpensive laser device. Becomes

Second Embodiment In this embodiment, only the construction of the light beam dividing means is the same as the first embodiment.
Unlike the embodiment, the other structure is the same as that of the first embodiment. Therefore, only the light beam dividing means will be described below.

FIG. 3 is a view showing the light beam dividing means 200 of this embodiment, FIG. 3 (a) is a plan view, and FIG. 3 (b) is an operation explanatory view.

This luminous flux means 200 also divides one luminous flux emitted from the He-Ne laser device 2 into two to form aiming light composed of two luminous fluxes, like the luminous flux dividing means 10 of the first embodiment. is there.

As shown in FIG. 3, the light beam dividing means 200 is
A strip-shaped light transmitting portion 202 is formed on one surface portion of the substantially rectangular plate-shaped body 201 so as to vertically cut through the central portion of the surface portion, and the surfaces 203 on both sides of the strip-shaped light transmitting portion 202 are formed.
And 204 are provided with a total reflection coating that totally reflects He-Ne laser light.

As shown in FIG. 3B, the light beam dividing means 200 is also arranged so that the laser beam L0, which is one light beam emitted from the He-Ne laser device 2, is incident from the 45 degree direction. Therefore, the one laser beam L0 is totally reflected by the total reflection surfaces 203 and 204 on both sides of the band-shaped light transmitting portion 202, and as a result, is divided into two light beams L1 and L2 and directed toward the beam splitter 4. Is ejected.

Also in this embodiment, the same effect as that of the first embodiment can be obtained.

Third Embodiment Also in this embodiment, only the configuration of the light beam dividing means is the same as the first embodiment described above.
Unlike the embodiment, the other structure is the same as that of the first embodiment. Therefore, only the light beam dividing means will be described below.

FIG. 4 is a view showing the light beam dividing means 300 of this embodiment.

This luminous flux means 300, like the luminous flux dividing means 10 of the first embodiment, divides one luminous flux emitted from the He-Ne laser device 2 into two to form aiming light composed of two luminous fluxes. is there.

As shown in FIG. 4, the light beam dividing means 300 is
The lens holding member 301 has two microlenses 302 and 303.
Are held on the same plane at a predetermined interval. In this case, two microlenses 302 and 303
A part of the lens holding member 301 is interposed between and, and this part serves as a light blocking portion 302, and one laser beam L0 emitted from the He-Ne laser device 2 is converted into two light beams L1 and
Divide into L2.

This embodiment is disadvantageous in comparison with the above-mentioned first and second embodiments by the amount of absorption at the time of transmission of the lens, but the attenuation is remarkably small as compared with the conventional case, and a laser device of small output is used. The effect that can be obtained can be obtained.

Fourth Embodiment Also in this embodiment, only the configuration of the light beam dividing means is the same as the first embodiment described above.
Unlike the embodiment, the other structure is the same as that of the first embodiment. Therefore, only the light beam dividing means will be described below.

FIG. 5 is a view showing the light beam dividing means 400 of this embodiment, FIG. 5 (a) is a plan view, FIG. 5 (b) is a side view, and FIG. 5 (c) is an operation explanatory view. Is.

This luminous flux means 400, like the luminous flux dividing means 10 of the first embodiment, divides one luminous flux emitted from the He-Ne laser device 2 into two and forms aiming light composed of two luminous fluxes. is there.

As shown in FIG. 5, the light beam dividing means 400 is
One edge of the triangular prism microprism 401 is slightly shaved to form a strip-shaped flat portion 402, the strip-shaped flat portion 402 is subjected to total reflection coating, and two surfaces 403 and 404 adjacent to the strip-shaped flat portion 402 and The facing surfaces 405 are each provided with an AR coating for antireflection. In this case, the band-shaped flat portion 402 serves as a light blocking portion and divides the laser light L0, which is one light beam emitted from the He-Ne laser device 2, into two light beams L1 and L2. That is, as shown in FIG. 5 (c), the laser beam L0, which is one light beam incident from the side of the band-shaped flat portion 402, is split by this band-shaped flat portion 402 and becomes two light beams L1 and L2.

This embodiment is also disadvantageous in comparison with the above-mentioned first and second embodiments by the amount of absorption at the time of transmission of the lens, but is remarkably attenuated as compared with the conventional case as in the above-mentioned third embodiment. It is possible to obtain the effect that a laser device having a small output and a small output can be used.

In each of the above-mentioned embodiments, the ophthalmic laser treatment apparatus according to the present invention has been described as an example in the case of being used for the treatment of cataract. However, instead of the YAG laser apparatus 1, laser light of another wavelength is generated. The device can be used for other treatments, for example, treatment of glaucoma.

[Advantages of the Invention] As described in detail above, the present invention is an ophthalmic laser treatment apparatus adapted to perform an aiming operation using aiming light composed of a plurality of light beams, wherein the aiming light is emitted from a light source. A single light beam is obtained by dividing it into a plurality of light beams by a light beam dividing means having a light-blocking portion that blocks a part of this light beam and divides it into a plurality of light beams having a cross-section of a plurality of light beams. In this way, the attenuation at the time of splitting one light flux into a plurality of light fluxes is reduced, and by using a laser device having a relatively small output, the focusing point of the therapeutic laser light can be quickly and quickly by a simple aiming operation. Thus, an ophthalmic laser treatment device capable of being accurately adjusted is obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing the overall configuration of an ophthalmic laser treatment apparatus according to the first embodiment of the present invention, and FIG. 2 is a diagram showing the light beam dividing means of the first embodiment, and FIG. 2 is a plan view, FIG. 2 (b) is a side view, FIG. 2 (c) is an operation explanatory view, FIG. 3 is a view showing a light beam dividing means of the second embodiment, and FIG. 4 is a third embodiment. FIG. 5 is a view showing an example light beam dividing means, and FIG. 5 is a view showing a light beam dividing means of the fourth embodiment. 1 ... YAG laser device for generating therapeutic laser light, 2 ...
... He-Ne laser device for aiming generation, 3 ... Focusing optical system, 4 ... Beam splitter as optical coupling means, 5
...... Observation optical system, Microscope optical system, 6 ... Treatment laser beam focusing position adjusting optical system, 7 ... Treatment eyeball,
10,200,300,400 …… Luminous flux dividing means.

Claims (1)

(57) [Scope of utility model registration request] 1. A focusing optical system is used to focus aiming light composed of a plurality of parallel light fluxes on a diseased part, and the focusing optical system is adjusted so that the spot of the aiming light is focused on a single point on the diseased part. In an ophthalmic laser treatment apparatus for performing treatment by focusing treatment laser light on an affected area through an optical system, the light source of the aiming light is arranged at a position deviated from the optical path of the treatment laser light and the aiming light Is provided in front of the focusing optical system on the path of the therapeutic laser light to combine with the optical path of the therapeutic laser light to block a part of one light beam emitted from the light source of the aiming light. In addition, a light speed dividing unit having a light blocking unit that divides the light beam into a plurality of light beams having a plurality of divided sections is provided between the light source of the aiming light and the combining unit. Ophthalmic laser treatment apparatus according to.