JPH01254160A - Laser beam treatment device - Google Patents

Abstract

PURPOSE:To miniature a laser beam treatment device by sharing a laser beam for incising, one part of the optical path of a laser beam for solidification and a coupling member with an observing system light flux. CONSTITUTION:A laser beam for solidification outgoing from a semiconductor laser beam source 1 is condensed through a condenser lens 2 to an incoming edge 3a in an optical fiber 3. Along the optical path of the outgoing light from an outgoing edge 3b in the optical fiber 3, a variable magnification lens 4, a reflecting mirror 5, optical coupling members 6 and 7, a lens 8, an optical coupling member 9 to be put in the observing optical path and an objective lens 10 to be commonly used with the observing optical path are successively arranged toward an eye E to be treated. A laser beam L2 for incising outgoing from a YAG laser beam source 11 is conducted through a concave lens 12 into the optical path of the laser beam L1 for solidification by the optical coupling member 6 and a visual guide light L3 from a visual guide light source 13 is conducted into the optical path of the laser beam L1 by the optical coupling member 7 respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a laser treatment device used, for example, in ophthalmological treatment.

[Prior Art] Conventionally, in a laser treatment device that has both the functions of incising and coagulating silver to be treated, a YAG laser beam is used for incision, and an argon laser beam is used for coagulation. It is designed to be guided within. Alternatively, the argon laser light may be guided from a slit illumination optical path of a slit lamp.

However, in these cases, there are problems such as an increase in the size of the device and a sacrifice of some of the functions of the slit illumination system.

C. Object of the Invention] An object of the present invention is to provide a laser treatment device that improves the problems of the conventional example, has both incision and coagulation functions, is small and easy to use.

[Summary of the invention] The gist of the present invention is to achieve the above objects.

a first optical coupling member that combines the light flux from the incision laser light source and the light flux from the coagulation laser light source; and an observation optical system so as to guide the light flux combined by the first light coupling member to the irradiated surface. This laser treatment apparatus is characterized in that it has a second optical coupling member disposed within the observation optical system to match the optical path with the observation light of the observation optical system.

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

FIG. 1 shows an embodiment of the present invention, and E is for the object to be treated.

Here, an invisible semiconductor laser beam is used as the coagulation laser beam, and the coagulation laser beam Ll emitted from the semiconductor laser light source I is focused on the input end 3a of the optical fiber 3 through the condenser lens 2. It looks like this. Along the optical path of the output light from the output end 3b of the optical fiber 3,
A variable magnification lens 4 consisting of a zoom lens, a deflection mirror 5, optical coupling members 6 and 7, a lens 8, an optical coupling member 9 placed in the observation optical path, and an objective lens 1 used in common with the observation optical system.
0 are sequentially arranged toward the treatment target E. Here, the optical coupling member 6 is a mirror or a prism with a thin film deposited on it, and the incision laser beam L2 emitted from the YAG laser light source 11 passes through the concave lens 12 and is transmitted by the optical coupling member 6 to the visible guide light source 13. Visible guide light L3 from the above is guided by the optical coupling member 7 into the optical path of the coagulation laser light L1. As shown in FIG. 2, the optical coupling member 9 is provided with guide light reflecting sections 9b and 9C that reflect the visible guide light L3 on both upper and lower sides of a central section 9a that transmits the visible guide light, and also includes guide light reflecting sections 9b and 9C that reflect the visible guide light L3.
．． A thin film that reflects L2 is applied to the entire surface. This thin film is a guichroic film and has the characteristics shown in FIG. 3, reflecting near-infrared laser beams L1 and L2 and transmitting visible guide light L3 used for observation. Further, on the other incident side of the optical coupling member 9, an observation optical system consisting of an imaging lens 14, a regular image prism 15, and an eyepiece 16 is provided, and the eyepiece 16 can be looked into with the observation eye e. Note that illustration of the illumination optical system is omitted.

The solidifying laser beam L1 of the semiconductor laser light source 1 is
The light beam is focused by the condensing lens 2 onto the input end 3a of the optical fiber 3 and exits from the output end 3b, and then passes through the variable magnification lens 4.
The light beam passes through the deflection mirror 5 and becomes a divergent light beam. On the other hand, the incision laser beam L2 from the YAG laser light source 11 is also applied to the concave lens 1.
2, the light beams become diverging in the same way, and both laser beams L1.
L2 is coupled by an optical coupling member 6. Here, the wavelength of the semiconductor laser beam L1 is about 0.8Rm, and the wavelength of the YAG laser beam L2 is about 1.061Lm.

Further, the visible guide light L3 from the visible guide light source 13 is also combined with the laser beams L1 and L2 by the optical coupling member 7, and these light beams L1. L2. L3 becomes a parallel light flux through the lens 8, is reflected by the optical coupling member 9, passes through the objective lens 10, and irradiates the treatment target E. At this time, in the optical coupling member 9, the laser beams Ll and L2 from the semiconductor laser light source 1 and the YAG laser light source 11 are reflected over the entire area, and the visible guide light L3 from the visible guide light source 13 is reflected at the reflection parts 9b and 9.
It is reflected only by C.

The observation optical system is generally a binocular system having a common objective lens 10, and mainly uses a slit lamp or the like. The observation light from the left and right observation optical paths passes through the transmitting parts 9L and 9R on the central part 9a of the optical coupling member 9 shown in FIG. 2, through which the visible guide light L3 is transmitted.

The YAG laser beam L2 for incision is emitted in a pulsed manner to increase energy density, and has a convergence angle of about 16 degrees for safety. On the other hand, although the semiconductor laser light Ll for coagulation is originally a diverging light beam, it is suitable for sharing the optical path if it has a similar convergence angle.

FIG. 4 shows a second embodiment, in which the same reference numerals as in FIG. 1 represent equivalent members. The optical coupling member 9 is arranged between the objective lens lO and the object to be treated E, and transmits the laser beams L1. Two lenses 17 and 18 are provided in place of the lens 8 on the optical path of L2, and a variable magnification lens 19 for observation is provided between the objective lens 10 and the imaging lens 14.

In this case, the diverging beams of the laser beams L1 and L2 are made into parallel beams by the lens 17, condensed by the lens 18, and reflected by the optical coupling member 9 to irradiate the treatment target E.

FIG. 5 is a front view of the optical coupling member 9 in a third embodiment in which argon laser light is used as the coagulation laser light. Argon laser light is semiconductor laser light L1
Similarly, the light is guided through the optical fiber 3, but since the convergence angle is smaller than that of the YAG laser light L2 for incision, it can be reflected using only the central part. That is, the light is reflected at the central portion 9e of the optical coupling member 9. Since this central portion 9e partially overlaps with the transmitting portions 9L and 9R, which are observation optical paths, a thin film that reflects only the wavelength band of the argon laser beam as shown in FIG.
If additional processing is applied to e, the influence on the observation optical path can be reduced.

[Effects of the Invention] As explained above, the laser treatment device according to the present invention has the following effects:
By sharing a part of the optical path of the incision laser beam and the coagulation laser beam and a coupling member with the observation system light beam, it is possible to downsize the apparatus.

[Brief explanation of the drawing]

The drawings show an embodiment of the laser treatment device according to the present invention,
Fig. 1 is a configuration diagram of the first embodiment, Fig. 2 is a front view of the second optical coupling member, Fig. 3 is a graph showing the spectral characteristics of the second optical coupling member, and Fig. 4 is a diagram showing the spectral characteristics of the second optical coupling member. FIG. 5 is a front view of the second optical coupling member according to the third embodiment; FIG.
The figure shows the wavelength characteristics of argon laser light. 1 is a semiconductor laser light source, 3 is an optical fiber, 4 is a variable magnification lens, 5 is a deflection mirror, 6.7.9 is an optical coupling member,
10 is an objective lens, 11 is a YAG laser light source, and 13 is a visible guide light source. 14 is an imaging lens, 15 is a regular image prism, 16 is an eyepiece, and 19 is a variable power lens. Patent applicant Canon Corporation 11Figure 2Figure 3Ll, L2Figure 5400 500 600 7CONm

Claims (1)

[Claims] 1. a first optical coupling member that combines the light flux from the incision laser light source and the light flux from the coagulation laser light source; and an observation optical system so as to guide the light flux combined by the first light coupling member to the irradiated surface. 1. A laser treatment device comprising: a second optical coupling member disposed inside the observation optical system to match the optical path with the observation light of the observation optical system.