JPH11276499A - Laser irradiator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a long-size laser irradiator capable of effectively irradiating a laser to the lesion part positioned in the deep part while restraining influence on an irradiating surface tissue and excellent in the so-called living body deep reachability and selectivity of the irradiating part. SOLUTION: This laser irradiator has beam splitters 21a, 21b and a reflecting mirror 22 (an emitting means) to emit plural laser beams different in an optical path so as to concentrate on the target part 60, and is constituted so that the laser beams are emitted as the parallel light. A converting means to convert the laser beams into the parallel light is desirably provided, and a collimator lens is desirable as the converting means, and is desirably constituted so as to emit the laser beams in the radial direction of an optical fiber 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser irradiation device, and more particularly to a long laser irradiation device used by inserting it into a living body lumen such as a blood vessel, a urethra, and an abdominal cavity.

[0002]

2. Description of the Related Art Conventionally, laser light has its monochromaticity, directivity,
Due to its excellent optical properties such as high brightness, it is used for precision cutting and drilling. In addition, treatments such as excision of a lesion, blood coagulation, tissue coagulation, and the like are performed by utilizing a photothermal reaction of laser light to a living tissue.

[0003] In such laser treatment, an appropriate device has been appropriately selected and used depending on the wavelength and energy density of the laser light to be irradiated, the optical characteristics of the living tissue to be irradiated, the type of treatment, and the like. However, it is difficult to control the irradiation area of the laser beam with any of the devices, and cauterize or coagulate only the affected tissue while not affecting the surrounding normal tissue. Was difficult.

In order to solve such a problem, the beam diameter of the laser beam has been reduced, and the laser beam has been irradiated so as to avoid a normal tissue.

Japanese Patent Application Laid-Open No. 8-215209 discloses a technique in which a target tissue to be treated is taken into a laser probe, a needle is punctured into the tissue, and the laser beam is directly irradiated. According to this, cauterization of only the deep part of the tissue is possible, but when the treatment site is wide, puncture of the needle and irradiation of laser light must be repeated, resulting in poor treatment efficiency and pain to the patient. There was a problem that could be.

Further, the same patent discloses a technique in which a plurality of laser powers are emitted and each laser power can be freely set. According to this, appropriate laser power can be supplied according to the shape of the irradiation target tissue.

However, it is very difficult to supply sufficient laser energy for treatment or the like to a deep lesion while suppressing the influence on the irradiated surface tissue due to the absorption of the laser light into the living tissue. There was a problem.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a so-called living body deepening device capable of effectively irradiating a laser to a deeply located lesion while suppressing the influence of the irradiation surface on normal tissue. Provided is a laser irradiation apparatus having excellent properties and selectivity of an irradiation part.

[0009]

This and other objects are achieved by the present invention which is defined below as (1) to (13).

(1) An elongated laser irradiating apparatus including an emitting means for emitting a plurality of laser lights having different optical paths so as to concentrate on a target portion, wherein the laser light is emitted as parallel light. A laser irradiation device.

(2) The laser irradiation apparatus according to the above (1), further comprising conversion means for converting the laser light into parallel light.

(3) The laser irradiation apparatus according to the above (2), wherein the conversion means is a collimating lens.

(4) The beam diameter of the parallel light is 0.2 to
The laser irradiation apparatus according to any one of the above (1) to (3), which is 5 mm.

(5) The laser irradiation apparatus according to any one of (1) to (4), wherein the emission unit emits the laser light in a radial direction of an optical fiber for guiding the laser light.

(6) The laser irradiation apparatus according to any one of the above (1) to (5), wherein the emission means has a plane mirror.

(7) The laser irradiation apparatus according to any one of (1) to (6), wherein the powers of the respective laser beams to be concentrated are substantially equal.

(8) The laser irradiation apparatus according to any one of the above (1) to (7), further comprising fixing means for fixing the laser irradiation apparatus.

(9) The laser irradiation apparatus according to any one of (1) to (8), further comprising a cooling unit for cooling the vicinity of the target portion.

(10) The laser irradiation apparatus according to the above (8) or (9), further comprising a balloon having at least one function of the fixing means and the cooling means.

(11) The above-mentioned (1) to (10) further comprising an observation means for observing the target portion and its vicinity.
The laser irradiation device according to any one of the above.

(12) The wavelength of the laser light is 800 to 1
The laser irradiation apparatus according to any one of the above (1) to (11), which has a wavelength of 300 nm.

(13) The laser irradiation apparatus according to any one of (1) to (12), wherein the laser beam is an Nd-YAG laser.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a laser irradiation apparatus according to the present invention will be described in detail based on a preferred embodiment shown in the accompanying drawings.

FIG. 1 is a schematic sectional view showing a first embodiment of the laser irradiation apparatus of the present invention, and FIG. 2 is a schematic sectional view showing an example of a use state of the laser irradiation apparatus shown in FIG.

The laser irradiation apparatus of this embodiment is used by inserting it into the urethra in the treatment of benign prostatic hyperplasia.

Hereinafter, a laser treatment apparatus will be described as an example of a laser irradiation apparatus. As shown in this figure, the laser irradiation device 1 of the present invention has an elongated shape in order to easily and safely insert it into a body lumen such as the urethra.

The optical fiber 10 is accommodated in the sheath 50. The sheath 50 has a main body 13 and a window 14.

The material of the main body 13 is made of, for example, polyethylene, polypropylene, polyethylene terephthalate, or soft polyvinyl chloride in order to impart flexibility to the laser irradiation apparatus of the present invention and reduce physical irritation to living tissues. , Polyurethane, polyamide, polyimide, polytetrafluoroethylene, silicone rubber and ethylene
A flexible polymer material such as a vinyl acetate copolymer is preferred.

Further, in order to impart rigidity to the laser irradiation apparatus of the present invention and improve operability, for example, polycarbonate,
It is preferable to use a hard polymer material such as an acrylic resin or a metal material such as stainless steel, titanium, or a titanium alloy.

The window portion 14 is preferably made of a material having excellent laser transmittance. Thereby, the sheath 50
The heat generation of itself can be suppressed, and the heating of the tissue or the like in contact with the sheath 50 can be prevented. Examples of a material forming the window portion 14 include a methacrylate resin, polycarbonate, polyethylene, polyvinyl chloride, polypropylene,
Examples include polystyrene, polyethylene terephthalate, polybutylene terephthalate, polyamide, polyurethane, fluorine-based resins, and composite materials or glass materials containing these resins.

An optical fiber 10 for guiding a laser beam has an input end 11 on the base end and an output end 12 on the distal end, and guides the laser light from the input end 11 to the output end 12. I do.
A laser oscillation device (not shown) is connected to the proximal end of the incident end 11.

As the optical fiber 10, a glass material such as quartz glass or a plastic material such as methacrylate resin is used. Optical fiber 10
May have any structure, for example, a double structure in which a single core is surrounded by a glad, a single core having a glad provided around a plurality of cores, or an optical fiber bundle in which a plurality of optical fibers are bundled. It may be configured.

The optical element for guiding the laser light is not limited to the above-mentioned optical fiber, but may be, for example, a rod lens.

A collimating lens 40 is provided on the distal end side of the emission end portion 12 of the optical fiber 10 as a conversion means for converting laser light into parallel light. As a result, it is possible to irradiate the parallel light, so that the energy density is higher than that of the diffused light. For example, it is possible to obtain a beam that can easily reach the target portion 60 located at a deep portion, and to improve the so-called biological penetration. Can be. Further, when irradiating the target portion 60 located inside the tissue (deep portion) with the laser light, if the energy density of the laser light reaching the target portion 60 is the same, the parallel light has a lower energy density in the surface layer portion. It can be lowered, and damage to the surface layer tissue can be suppressed.

The beam diameter of the parallel light is preferably about 0.2 to 5 mm, more preferably 0.4 to 3 mm. If the beam diameter is too large, the laser beam may be irradiated to the peripheral portion of the target portion 60, and the selectivity of the irradiated portion may decrease. On the other hand, if the beam diameter is too small, the irradiation efficiency may decrease.

The collimator lens 40 is not limited to the position shown in the figure as long as it can emit laser light as parallel light, and can be arranged at any position in the optical path.

The conversion means includes a spherical lens, an aspherical lens, a distributed refractive plate lens, a Fresnel lens,
An arbitrary optical element such as a rod lens (a green lens) can be used, and among these, the same or different optical elements may be combined to be configured to emit parallel light.

At the distal end of the collimating lens 40, beam splitters 21a and 21b and a reflecting mirror 22 are provided as emission means for irradiating the laser beam in the radial direction of the optical fiber 10. Thereby, the laser beam is split into a plurality of beams having different optical paths.

Here, the “radial direction” refers to the optical fiber 10
A direction extending from the axis of (sheath 50) outward at an arbitrary angle means not parallel to the axis.

By irradiating the laser beam in the radial direction, so-called side irradiation, particularly when the laser beam is inserted into a living body lumen such as a blood vessel, urethra, or abdominal cavity, the irradiation position and irradiation angle of the laser beam Easy to adjust etc. and excellent in handling.

Each of the beam splitters has an optical fiber 1 so that a laser beam is incident on the reflecting surface from an oblique direction.
It is preferable that the sensor is installed so as to have an angle of 5 to 170 ° (excluding 90 °) with respect to the 0 axis.

First, the laser light incident on the beam splitter 21a is split into transmitted light and reflected light. The transmitted light further enters the beam splitter 21b on the tip side,
The reflected light is emitted in the radial direction of the optical fiber 10 (sheath 50). Further, the reflected light split by the beam splitter 21b is emitted in the radial direction, and the transmitted light is emitted in the radial direction by the reflecting mirror 22. Thus, the laser light is split into three and emitted in the radial direction.

As described above, by dividing and emitting the laser light having the predetermined energy, the influence of one divided laser light on the irradiated surface structure can be reduced.

Further, by adjusting the angles of the beam splitters 21a and 21b and the reflecting mirror 22, the irradiation angle and irradiation position of each laser beam can be set arbitrarily, and a plurality of laser beams can be concentrated on the same location. This can be easily performed.

Further, if a beam splitter is used,
Since a plurality of laser beams can be obtained by dividing the laser light guided by the optical fiber, the diameter of the laser irradiation device can be reduced, and the penetrability into a body lumen such as the urethra can be improved. In addition, treatment and treatment can be performed more smoothly.

The branching ratio of the beam splitter used in the present invention is not particularly limited, and can be arbitrarily selected depending on the number of laser light divisions, the intensity of the laser light, the wavelength, and the like. In addition, by setting the branching ratio of the beam splitter independently and arbitrarily, the emission amount of each laser beam can be freely adjusted, and appropriate laser treatment can be performed according to a treatment site and a symptom.

The beam splitter that can be used in the present invention may be of any type, and is appropriately selected depending on the wavelength, polarization characteristics, and the like of the laser, and examples thereof include a plane beam splitter, a cube beam splitter, and a thin film beam splitter. In particular, a beam splitter made of a dielectric multilayer film is more preferable because it can reduce laser beam splitting loss and heat generation.

The reflecting mirror 22 is provided at the most distal end of the sheath 50. The reflecting mirror 22 includes a beam splitter 21b.
It is constituted by a plane mirror that totally reflects the laser beam that has passed through. The reflecting surface of the reflecting mirror 22 is preferably one coated with gold, aluminum, or a dielectric multilayer film. This improves the reflectance and thermal conductivity of the laser light,
Since heat generated by the irradiation of the laser beam is quickly dissipated, burn-in of the reflection surface can be prevented.

The laser irradiation apparatus of the present invention is configured so that a plurality of laser beams having different optical paths are concentrated on a target portion.

In this embodiment, the beam splitter 21
a, 21b and the angle of the reflecting mirror 22 are adjusted, etc.
One laser beam can be focused on the target site 60 (for example, a lesion). With such a configuration,
The required laser energy can be supplied to the laser beam concentrating portion. On the other hand, since the energy of each laser beam can be kept low, the thermal effect on the tissue can be reduced unless the laser beam is folded or concentrated. In other words, by concentrating the laser light on the lesion, the diseased tissue can be coagulated and necrotic.However, it is possible to select the irradiation site without damaging the tissue around the lesion or the irradiation surface where the laser light is not concentrated. Performance can be improved.

Further, since the required energy is obtained by concentrating a plurality of laser beams, it is not necessary to extremely reduce the diameter of one beam. It is possible to do.

The power of each laser beam to be concentrated is:
Preferably, they are approximately equal. With such a configuration, bias in the power of the laser beam can be avoided, damage to tissues other than the target site can be prevented, and selectivity of the irradiation site can be improved.

In this embodiment, the beam splitter 2
By setting the branching ratio (reflectance) of 1a to 1/3 and the branching ratio of the beam splitter 21b to 1/2, the powers of the three reflected lights can be made substantially equal.

The target portion for focusing the laser beam may be at any position, for example, a deep portion of the object to be irradiated.

In general, laser treatment for prostatic hypertrophy involves inserting the sheath 50 into the urethra 62 as shown in FIG. It is performed by Therefore, according to the laser irradiation apparatus of the present invention, the laser beam can be irradiated so as not to concentrate on the urethral wall 621 but to concentrate on the lesion 63 located deeper than the urethral wall 621. While the lesion 63 can be treated, the urethral wall 6
The 21 organizations are intact.

In this case, the laser light is applied to, for example, the urethral wall 621.
From about 3 to 22 mm, preferably about 5 to 17 mm. Within this range, laser treatment for most prostatic hyperplasia can be performed safely without affecting the urethral wall 621, the prostatic capsule, and the abdominal rectal wall.

Further, by making the laser beam parallel, it is possible to more easily and reliably irradiate the lesion 63 located at a deep portion while suppressing damage to the tissue of the urethral wall 621.

The laser beam used in the laser irradiation apparatus of the present invention is not particularly limited as long as it has a biological invasive property. For example, a gas laser such as a He—Ne laser, Nd
Solid-state lasers such as -YAG lasers and semiconductor lasers such as GaAlAs lasers. Above all, the wavelength is 80
Since the laser light of about 0 to 1300 nm is particularly excellent in the depth of the living body, when the living body tissue is irradiated with the laser light, the absorption of energy in the surface layer is small, and therefore, the living tissue is more effectively absorbed. Irradiation target located deep (lesion)
Can be irradiated with laser light. Note that, as a laser oscillation device that generates laser light of the above-mentioned wavelength, for example, an Nd-YAG laser having a wavelength of 1064 nm can be used.

Further, the laser light may be either continuous light or pulsed light, but continuous light is more preferable. In the case of pulsed light, the temperature change due to the irradiation cycle on the irradiation surface is large, and the surface layer is likely to be damaged. However, in the case of continuous light, the damage to the irradiation surface can be reduced by maintaining a constant temperature.

FIG. 3 shows a second embodiment of the laser irradiation apparatus of the present invention. The laser irradiation apparatus according to the present embodiment is a laser treatment apparatus that is used by being inserted into the urethra in the treatment of prostatic hypertrophy as in the first embodiment.

Hereinafter, points different from the first embodiment will be mainly described. The laser irradiation device 1 of the present embodiment
As in the case of the first embodiment, the optical fibers 10a, 10b, and 10 are placed in a sheath 50 having a main body 13 and a window 14.
c is accommodated. Optical fibers 10a, 10b, 10
The respective output ends 12a, 12b, and 12c of c are shifted from each other in the axial direction. The laser light is emitted from the input ends 11a, 11b, 11c of each optical fiber to the output ends 12a,
The light is guided to 12b and 12c.

With this configuration, the laser light guided by each optical fiber can be independently selected, so that the emission condition of the laser light can be arbitrarily set. Therefore, an appropriate laser beam can be emitted in accordance with the shape and position of the lesion tissue, and more effective and efficient laser treatment can be performed. In addition, even when the powers of the respective laser beams are made substantially equal to each other, the power can be easily controlled because the power can be adjusted independently for each optical fiber.

The output ends 12a, 12b,
A collimating lens 40a, 40b, 40c is provided as a converting means on the distal end side of 12c, and a reflecting mirror 22a composed of a plane mirror constituting an emitting means is provided on the distal end side.
22b and 22c are provided. The laser light is converted into parallel light and emitted in a radial direction by a reflecting mirror.

By adjusting the angle, position and the like of each reflecting surface, each laser beam can be concentrated on a target portion.

The laser beams emitted from the respective emission ends may be the same or different in type, power, etc., but in this embodiment, as in the above case, the power of each laser beam to be concentrated is almost the same. Preferably they are the same.

Note that the same conversion means, emission means, laser light, and the like as those in the first embodiment can be used.

FIG. 4 shows a third embodiment of the laser irradiation apparatus of the present invention. The laser irradiation device 1 according to the present embodiment includes:
Balloon 70 as a cooling means for cooling the irradiation surface
It has. The balloon 70 is fixed to the distal end side of the sheath 50. As the optical fiber, the emission unit, the conversion unit, and the like housed in the sheath 50, those described in the above embodiment are used.

When the laser irradiation device 1 is inserted into the urethra in a state where the balloon 70 is deflated, and reaches the vicinity of the target portion 60 (lesion), the cooling liquid is injected from the injection port 71 into the balloon 70.
Inject into. Thereby, the balloon 70 is inflated, and the cooling liquid filling the balloon 70 is discharged from the cooling liquid discharge port 72.

The balloon 70 inflated during the laser irradiation comes into contact with the urethral wall, and the urethral wall is cooled by the cooling liquid flowing in the balloon 70. Thus, damage to the urethral wall tissue due to heat generated by laser irradiation can be suppressed. At this time, the effect can be further improved by cooling the tissue by flowing a cooling liquid through the balloon 70 in advance before the laser beam irradiation.

Further, by controlling the temperature and flow rate of the cooling liquid in conjunction with the irradiation of the laser beam, more appropriate cooling can be performed. Further, the cooling efficiency can be improved as the temperature of the cooling liquid is lowered, but it is more preferably about 0 ° C.

Further, it is preferable that the balloon 70 is provided with temperature control means such as a temperature sensor so as to monitor the temperature of the surface of the object to be irradiated and the target site. Thereby, laser irradiation can be performed more effectively, efficiently and safely.

Although the cooling liquid is not particularly limited, it is preferable to use physiological saline. Even when the cooling liquid leaks into the body due to malfunction of the balloon 70 or the cooling water circulation mechanism, the influence on the living body can be reduced.

As a material constituting the balloon 70, a flexible resin material is preferable, and among them, polyolefin, polyester, polyamide, latex and the like are more preferable.
Since these materials have excellent laser transmittance, heat generation of the balloon 70 can be reduced during laser light irradiation.

Further, the balloon 70 functions as fixing means for fixing the laser irradiation device. Inflated balloon 7
The laser irradiation device 1 is fixed by securing and maintaining a good contact state with the urethral wall. Therefore, the laser beam can be accurately irradiated to the lesion, and the controllability is maintained. Further, the compression by the balloon 70 removes blood and other bodily fluids from the compressed portion, resulting in an ischemic state, whereby the attenuation of laser light due to absorption into blood or the like can be reduced. In addition, the tissue is compressed along with the inflation of the balloon 70, the optical path to the lesion is shortened, and the irradiation effect of the laser beam can be further improved.

The fluid supplied to the balloon 70 may be either a liquid or a gas. However, in order to ensure safety when the fluid leaks into the body due to a malfunction of the circulation mechanism, a physiological saline solution is used. Is preferred.

It is also possible to provide a pressure valve or the like at at least one position in the fluid flow path communicating with the balloon 70 and to inflate the balloon 70 at a constant pressure. Thus, since the balloon 70 maintains a constant contact state with the urethral wall, there is no possibility that the irradiation position or the irradiation angle of the laser beam fluctuates due to the fluctuation of the flow rate of the fluid.

When a cooling liquid (for example, physiological saline at about 0 ° C.) is used as the fluid, the balloon 70 has both functions as the fixing means and the cooling means.

FIG. 5 shows a fourth embodiment of the laser irradiation apparatus of the present invention. The laser irradiation apparatus according to the third embodiment has a structure in which the sheath 50 is inserted into the outer sheath 53 and is detachable. Thereby, only the outer sheath 53 that directly contacts the living tissue can be made disposable. In addition, when the irradiation direction or position of the laser beam is changed, it is achieved by moving and rotating only the inner sheath 50, so that abrasion due to sliding of the sheath in the urethra can be reduced.

FIG. 6 shows a fifth embodiment of the laser irradiation apparatus of the present invention. The laser irradiation apparatus according to the present embodiment includes an endoscope 80 as an observation unit for observing a target portion and its vicinity. The endoscope 80 includes the endoscope lumen 5.
2 and installed in the sheath 50 so as to be parallel to the optical fiber 10.

By providing observation means such as an endoscope,
Erroneous irradiation of laser light is prevented beforehand, and safe and appropriate laser treatment can be performed. Furthermore, it is possible to shorten the treatment time and minimize the treatment cost.

As shown in FIG. 6, a front perspective endoscope is used in the present embodiment. Thereby, the tissue can be easily observed, and the optical path of the laser beam is not obstructed by a part of the observation means.

When such a laser irradiating device 1 is inserted into the urethra 62 and the tip of the laser irradiating device 1 is inserted close to the lesion 63, the state of the surface of the lesion 63 is observed with the endoscope 80. Then, the irradiation position, irradiation direction, and irradiation state of the laser beam are checked. Further, at this time, the state of the lesion 63 in the depth direction can be confirmed by using the ultrasonic diagnostic means and the like, and the position can be more easily specified.

Examples of the observation means include endoscope means, ultrasonic diagnostic means, and contrast means using a contrast agent. Furthermore, other devices for monitoring the condition in the body lumen (for example, pressure measuring device, temperature measuring device, potential measuring device, etc.)
May be provided. Note that the emission means and the conversion means described in the above embodiments can be used.

In the state where the lesion 63 is observed by the endoscope 80, a plurality of laser beams are emitted as parallel light as shown in the figure.

Further, each laser beam passes through the urethral wall 621 and is irradiated so as to concentrate on the lesion 63 located at a deep portion. As a result, the tissue in the lesion 63 undergoes treatment such as degeneration such as heating and coagulation, while the urethral wall 621 does not fold or concentrate the laser beam, so that the energy density is small and the tissue is not damaged.

The endoscope 80 is not limited to the type of the present embodiment, but may be of any other type such as a rear oblique type.

The laser irradiation apparatus according to the present invention has been described with reference to the illustrated embodiments. However, the present invention is not limited to these embodiments, and the configuration of each means may be replaced with any configuration having the same function. be able to. For example, the features of the above embodiments may be appropriately combined.

The sheath 50 or the outer sheath 5
3 may be configured to apply a hydrophilic lubricating substance. Thereby, lubrication can be further improved by the provision of moisture, and friction with living tissue when the sheath 50 or the like is inserted into the body lumen and used can be reduced. Examples of such a hydrophilic lubricating substance include carboxymethyl cellulose, polysaccharides, polyvinyl alcohol, polyethylene oxide, sodium polyacrylate, methyl vinyl ether maleic anhydride copolymer, and water-soluble polyamide. Maleic anhydride copolymers are more preferred.

Further, it may be provided with an angle variable mechanism and a position adjusting mechanism for controlling the position, angle, etc. of the light emitting means.

[0090]

As described above, when the laser irradiation apparatus of the present invention is used by inserting it into a living body lumen such as a blood vessel, urethra, or abdominal cavity, it does not damage the irradiation surface tissue. Sufficient laser light can be supplied to a target portion located in a deep part, and the living body has excellent penetration.

Further, the influence of the laser beam on the periphery of the target portion can be suppressed, and the irradiation portion selectivity is excellent.

Further, by providing fixing means, cooling means, observation means, etc., safer, more effective and efficient laser treatment can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a first embodiment of a laser irradiation apparatus according to the present invention.

FIG. 2 is a schematic sectional view showing an example of a use state of the laser irradiation device shown in FIG.

FIG. 3 is a schematic sectional view showing a second embodiment of the laser irradiation apparatus of the present invention.

FIG. 4 is a schematic sectional view showing a third embodiment of the laser irradiation apparatus of the present invention.

FIG. 5 is a schematic sectional view showing a fourth embodiment of the laser irradiation apparatus of the present invention.

FIG. 6 is a schematic sectional view showing a fifth embodiment of the laser irradiation apparatus of the present invention.

[Explanation of symbols]

 Reference Signs List 1 laser treatment device 21a, 21b beam splitter 22 reflector 22a, 22b, 22c reflector 40 collimator lens 40a, 40b, 40c collimator lens 50 sheath 52 endoscope lumen 53 outer sheath 60 target site 62 urethra 621 urethral wall 63 lesion Reference Signs List 10 optical fiber 11 entrance end 11a, 11b, 11c entrance end 12 exit end 12a, 12b, 12c exit end 13 main body 14 window

Claims (6)

[Claims] 1. An elongated laser irradiation device comprising an emission unit for emitting a plurality of laser beams having different optical paths so as to concentrate on a target portion, wherein the laser beam is emitted as parallel light. A laser irradiation apparatus characterized by the above-mentioned. 2. The laser irradiation apparatus according to claim 1, further comprising a conversion unit that converts the laser light into parallel light. 3. The laser irradiation apparatus according to claim 2, wherein said conversion means is a collimator lens. 4. The laser irradiation apparatus according to claim 1, wherein a beam diameter of the parallel light is 0.2 to 5 mm. 5. The laser irradiation apparatus according to claim 1, wherein the emission unit emits the laser light in a radial direction of an optical fiber for guiding the laser light. 6. The light emitting means has a plane mirror.
6. The laser irradiation apparatus according to any one of claims 5 to 5.