JPH01135369A - Apparatus for laser irradiation - Google Patents

Abstract

PURPOSE:To uniformly irradiate an entire target lesion with laser, by providing a means for making a radiation spot of laser scan the surface of the lesion. CONSTITUTION:An insertion part 1 of an endoscope has an observation window 2, a lighting window 3 and an aperture 4 for a channel on one end thereof. A laser guide 5, running through the channel, has a bent tip 6 which is projected from the aperture 4. The laser guide 5 is rotated to make a radiation spot s of laser uniformly scan the surface of an entire target lesion.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a laser light irradiation device that irradiates a living tissue within a body cavity with laser light, for example.

[Prior Art] There is a device that cauterizes living tissue, as known from Japanese Patent Publication No. 62-8174, etc., as a device for irradiating laser light onto living tissue within a body cavity. The light is guided to a single point in the living tissue. In other words, the laser beam guided by the laser probe
Only point areas can be irradiated.

[Problems to be Solved by the Invention] Conventionally, when irradiating a biological tissue with a laser beam, the laser beam guided by a laser probe is applied to one part of the biological tissue.
Because it can only irradiate a point, the temperature is high at the center and rapidly decreases toward the periphery. In other words, it is difficult to uniformly heat the entire affected area within a certain range. In particular, when performing hyperthermia treatment, which involves heating the affected area to a constant temperature, it is difficult to maintain a uniform temperature throughout the affected area, making it difficult to ensure an effective treatment effect.
.

The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a laser beam irradiation device that can uniformly irradiate the entire area to be irradiated with laser light.

[Means and effects for solving the problems] In order to solve the above problems, the laser beam irradiation device of the present invention is provided with means for scanning the irradiation spot of the laser beam emitted from the laser guide over the surface of the irradiation area, By scanning the irradiation spot over the surface of the irradiation area, the entire irradiation area can be uniformly irradiated.

[Embodiment] FIGS. 1 and 2 show a first embodiment of the present invention. This embodiment constitutes a laser beam irradiation device for hyperthermia.

Reference numeral 1 in FIG. 1 is an insertion section of an endoscope, and an observation window 2 and an illumination window 3 are formed on the distal end surface of this insertion section 1. Further, a channel opening 4 of an insertion channel is formed on the distal end surface of the insertion portion 1, avoiding the observation window 2 and the illumination window 3. This insertion channel is formed across the inside of the insertion section 1,
It communicates with the insertion port of the operating section.

A laser guide 5 which has a certain degree of flexibility and can follow the curve of the insertion portion 1 is rotatably inserted into the insertion channel. The tip 6 of the laser guide 5 is bent diagonally forward, and its output tip surface 7 also faces diagonally forward. Furthermore, the laser guide 5
As shown in FIG. 2, it is rotatably driven by a rotary drive device 11 on the operation section side of the endoscope.

This constitutes means for scanning the laser beam irradiation spot s over the outer surface of the irradiation area in a uniform rotational manner, as will be described later.

The rotary drive device 11 is a rotary drive source, for example, a motor 1.
2, which drives the laser guide 5 via the rotation operation mechanism 13. The rotation operation mechanism 13 includes a rotating plate 1 on the outer periphery of a rotating frame 14 that fixes the base end of the laser guide 5.
The rotary plate 15 is rotatably driven by a motor 12.

Further, the output end surface of the introducing laser guide 16 is connected to the input end surface of the laser guide 5 supported by the rotation operation mechanism 13 via a condenser lens 17 . This introduction laser guide 16 is connected to a laser generator 18 that oscillates YAG laser light, for example.

Then, the insertion section 1 of the endoscope is introduced into the body cavity, and the distal end surface of the insertion section 1 is directed toward the affected area within the body cavity.

Further, the laser guide 5 is inserted into the insertion channel, and its distal end 6 is projected from the channel opening 4 of the insertion section 1. Although the tip 6 of the laser guide 5 has a tendency to bend, it bends along the inner surface of the insertion channel when passing through the insertion channel, so it can be easily passed through the insertion channel. In other words, there is no need to make the inner diameter of the insertion channel larger than necessary.

The tip 6 of the laser guide 5 that protrudes from the channel opening 4 of the insertion channel protrudes diagonally forward. Therefore,
While operating the rotary drive device 11 to rotate the laser guide 5, the laser generator 18 is operated to emit laser light to emit a laser beam from the emitting tip surface 7 of the laser guide 5. The tip 6 of the laser guide 5 protrudes diagonally forward, and the emission tip surface 7 also faces diagonally forward, so the laser light emitted from the emission tip surface 7 is emitted diagonally forward at an angle with the center of rotation. In this state, the laser guide 5 rotates, so the irradiation spot S rotates and scans the entire affected area.

This uniformly warms the entire affected area to which the laser beam is irradiated.

FIG. 3 shows a second embodiment of the invention. This embodiment is a modification of the rotation drive device 11, in which the rotation frame 14 of the rotation operation mechanism 13 is directly rotationally driven by an ultrasonic motor 21. In this case, the rotating frame 14
constitutes the rotor of the ultrasonic motor 21. According to this configuration, the rotary drive device 11 can be made more compact.

FIG. 4 shows a third embodiment of the invention. In this embodiment, instead of bending the distal end 6 of the laser guide 5 that protrudes from the distal end surface of the insertion section 1 of the endoscope, the emitting distal end surface 7 of the laser guide 5 is formed obliquely. In this way, the laser beam can be emitted diagonally forward without bending the tip 6 of the laser guide 5. Other configurations, effects, etc. are the same as those of the first embodiment.

5 and 6 show a fourth embodiment of the present invention. In this embodiment, a transparent tip 26 is attached to the tip of an exterior sheath 25 that rotatably covers the laser guide 5, and this tip 26 has a wedge-shaped tip surface 27.
is formed diagonally. Further, as shown in FIG. 6, the outer sheath 25 is a rotary drive device 2 having a configuration similar to that of the above-described rotary drive device 11 similar to that of the first embodiment.
8. The rotational drive device 28 includes a first rotating plate 29 that supports the proximal end of the exterior sheath 25, and a motor 3 is connected to the first rotating plate 29.
A second rotary plate 31 driven at 0 is in rolling contact and engaged. Then, by driving the motor 30, the motor 3
The exterior sheath 25 can be rotated by transmitting zero rotational force from the second rotary plate 31 to the first rotary plate 29.

Therefore, the outer sheath 2 is rotated by the rotational drive device 28.
When a laser beam is emitted from the emission tip surface 7 of the laser guide 5 while rotating the laser guide 5, the laser beam is bent when transmitted from the tip 26 and rotates while being emitted diagonally forward. Therefore, the laser beam irradiation spot S rotates and scans the entire affected area. This uniformly warms the entire affected area to which the laser beam is irradiated.

FIG. 7 shows a fifth embodiment of the present invention. This embodiment shows a modification of the rotary drive device 28 of the fourth embodiment. That is, in this embodiment, the exterior sheath 25 is rotated using the ultrasonic motor 35. Other points are the same as in the fourth embodiment.

FIGS. 8 and 9 show a sixth embodiment of the present invention. In this embodiment, a tip 26 similar to that of the fourth embodiment is attached to the tip of a shaft 41 installed in parallel with the laser guide 5 apart from the outer sheath, and the tip 26 is rotated via this shaft 41. I tried to let him do it. This shaft 41 is rotatably driven by a motor 42, as shown in FIG.

FIG. 10 shows a seventh embodiment of the present invention. In this embodiment, a support rod 46 with a bent tip portion 45 is installed along with the laser guide 5, and the support rod 46 is attached to the laser guide 5.
I made it rotate around the .

Since the tip of the laser guide 5 can be bent, when the support rod 46 is rotated around the laser guide 5 with the center of the laser guide 5 as the rotation center by a rotational drive device (not shown), the support rod 46 can be bent. The tip portion of the laser guide 5 moves along the curved tip portion 51,
It rotates while changing the direction of inclination. Therefore, the laser beam irradiation spot s rotates and scans the entire affected area. Thereby, the entire affected area to which the laser beam is irradiated can be uniformly heated.

FIG. 11 shows an eighth embodiment of the present invention. In this embodiment, a laser guide 5 is inserted and installed in a guide sheath 52 having a bent tip portion 51, and the guide sheath 52 is rotated by a rotation drive device (not shown).

Since the distal end portion of the laser guide 5 can be bent, when the guide sheath 52 is rotated by the rotational drive device, the bent distal end portion 45 of the guide sheath 52
The tip portion of the laser guide 5 moves along the direction and rotates while changing the direction of inclination. Therefore, the laser beam irradiation spot S rotates and scans the entire affected area. This results in
The entire affected area irradiated with laser light can be heated uniformly.

Note that the present invention is not limited to the above embodiments. This laser beam irradiation device may be used not only for hyperthermia but also for cauterizing living tissue, for example.

[Effects of the Invention] As explained above, the laser beam irradiation device of the present invention is provided with a means for scanning the irradiation spot of the laser beam emitted from the laser guide over the surface of the irradiation site, and scans the irradiation spot over the surface of the irradiation site. This makes it possible to uniformly irradiate the entire irradiation area.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the main parts of the first embodiment of the present invention, FIG. 2 is a side sectional view of the rotary drive device of the first embodiment, and FIG.
FIG. 4 is a side sectional view of a rotary drive device showing a second embodiment of the invention, FIG. 4 is a perspective view of a main part showing a third embodiment of the invention, and FIG. 5 is a fourth embodiment of the invention. FIG. 6 is a side sectional view of the rotary drive device showing the fourth embodiment, and FIG. 7 is a side sectional view of the rotary drive device showing the fifth embodiment of the present invention. FIG. 8 is a side view of essential parts showing the sixth embodiment of the present invention, FIG. 9 is a side view of the rotary drive device also showing the sixth embodiment, and FIG. FIG. 11 is a perspective view showing the main parts of the seventh embodiment of the invention, and FIG. 11 is a perspective view showing the main parts of the eighth embodiment of the invention. DESCRIPTION OF SYMBOLS 1... Insertion part, 4... Channel opening, 5... Laser guide, 7... Output tip part, 11... Rotation drive device, 12... Motor, 21... Ultrasonic motor , 25
...Exterior sheath, 26...Tip tip, 28...
Rotary drive device, 30... motor, 4.1... shaft,"
46... Support rod, 51... Tip portion, 52... Guide sheath. Applicant's representative Patent attorney Jun Tsuboi Figure 1 Figure 4 Figure 5. Figure 7 Figure 8 Figure 10 Figure 9 Figure 11

Claims (1)

[Claims] 1. A laser beam irradiation device comprising: a laser guide; and means for scanning an irradiation spot of a laser beam emitted from the laser guide over the surface of an irradiation site.