JPH0449957A - Laser irradiator for endoscope - Google Patents

Abstract

PURPOSE:To enable the prevention of irradiation of parts other than a desired part with a laser beam by providing a laser beam absorbing member comprising a high water content substance surrounding a part to be treated on the outgoing side of a laser probe to make the laser light irradiate the desired part accurately. CONSTITUTION:A tip structural part 11 at a tip of an inserting part 3 of an endoscope 1 is provided with an inserting hole 14 and, furthermore, a small- diameter part 15 is formed on the outer circumference on the side of the tip of the tip structural part 11 to mount a hood 16 as ring-shaped laser beam absorbing member free to detach. The hood 16 is made of high water content polyvinyl alcohol in a ring and arranged sticking out from the tip structural part 11. With such an arrangement, a laser beam traveling to parts other than a desired part out of the laser beams emitted at an outgoing end of a laser probe is absorbed by the hood 16 made of the high water content material, thereby preventing heat damages to normal tissues.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention is a method for treating an area to be treated by irradiating the area to be treated with laser light emitted from a laser probe inserted through an insertion channel of an endoscope. This invention relates to a laser irradiation device for endoscopy.

[Prior Art] Laser therapy is known as a method for treating malignant tumors such as cancer, in which the affected area is irradiated with laser light and cancer cells are killed by the laser energy. In this laser treatment method, a laser probe is inserted through an insertion channel provided in an insertion section of an endoscope. The proximal end of this laser probe is connected to a CO2 laser oscillator, the distal end thereof is made to protrude from the distal end component of the endoscope, and the emitting end of the laser probe is made to face the treated area such as cancer cells. Then, a laser beam oscillated from a CO2 laser oscillator is emitted from an output end of a laser probe, and the laser beam is irradiated onto a treatment target such as a cancer cell for treatment.

In this case, since the insertion part of the endoscope inserted into the body cavity is not stable, it is difficult to ensure that the emitting end of the laser probe faces the treated area, and the emitted light is emitted from the emitting end of the laser probe. It is not possible to reliably irradiate the treated area with laser light. In other words, there is a risk that normal tissues other than the treated area may be irradiated with laser light. Therefore, a cylindrical hood is provided on the distal end of the endoscope, and the distal end of the hood is pressed against the treated area and the distal end is fixedly held while being exposed to laser light from the output end of the laser probe. The treatment area is irradiated.

Furthermore, as a technique for preventing thermal damage to areas other than the target area during laser treatment, for example, US Pat. No. 4,646,734 is known. It has a coating to absorb it.

[Problems to be Solved by the Invention] However, as described above, even if a hood is provided at the distal end component of the endoscope and the hood is pressed against the treated area, the laser beam irradiated from the output end of the laser probe may leak from the tip of the hood into the surrounding area and cause thermal damage to normal tissue. In addition, USP No. 4,646,734 specifies
A surgical trowel that has a coating for absorbing laser energy on the outer surface of a member with high thermal conductivity that guides the laser beam to the target area, and is used to treat the area by irradiating the laser beam to the target area. isn't it.

This invention was made in view of the above-mentioned circumstances, and its purpose is to provide an endoscopic system that can reliably irradiate a target area with a laser beam and prevent the irradiation of a laser beam to areas other than the target area. An object of the present invention is to provide a mirror laser irradiation device.

[Means and effects for solving the problem] This invention has the following features:
In order to solve the above-mentioned problems, an endoscope for treating the treated area by irradiating the treated area with laser light emitted from a laser probe inserted through an insertion channel of the endoscope. In the laser irradiation device, a laser light absorbing member made of a highly water-containing substance is provided on the emission side of the laser probe.

By surrounding the treated area with the laser absorbing member, the laser beam emitted from the emission end of the laser probe and directed toward other than the target area is absorbed by the laser beam absorbing member made of a highly water-containing substance.

[Example] Hereinafter, each embodiment of the present invention will be described based on the drawings.

1 and 2 show a first embodiment.

A direct viewing endoscope 1 shown in FIG. 1 consists of an operating section 2, an insertion section 3, and a light guide cable 4. The operating section 2 has an eyepiece section 5, and the light guide cable 4 has a light source device 6.
A connector 7 is provided to be connected to. The insertion portion 3 is equipped with a light guide fiber 8 and an image guide fiber 9, and is also provided with an insertion channel 1°. A distal end component 11 is provided at the distal end of the insertion section 3, and the distal end component 11 is provided with an illumination lens 12, an objective lens 13, and an insertion hole 14. Further, a small-diameter portion 15 is formed on the outer periphery of the distal end side of the distal-end forming portion 11, and a hood 16 as a ring-shaped laser beam absorbing member is removably attached to this small-diameter portion 15.

The hood 16 is formed into a ring shape using high water content rubber as a high water content material, and is provided so as to protrude further forward than the tip portion constituting portion 11 . This high water content rubber is formed by partially dehydrating (10 to 20%) a polyvinyl alcohol (PVA) aqueous solution (60 to 90% water) under reduced pressure while frozen, and has excellent water and oil resistance. It is biocompatible.

FIG. 2 shows an example of the use of the endoscope 1, in which a malignant tumor, such as a cancerous tissue, generated on the inner wall of the stomach 18 is being treated. That is, the insertion section 3 of the endoscope 1 is inserted through the oral cavity 20, the distal end component 11 is guided to the target part while observing the inside of the stomach 18 using the eyepiece section 5, and the endoscope 1 is attached to the distal end component #11. Place the tip of the hood 16 on the treated area 1.
can be brought into contact with.

Further, the operating section 2 of the endoscope 1 is provided with a treatment instrument insertion port 21, which communicates with the insertion channel 10, into which a laser probe 22 is inserted. The base end of the laser probe 22 is connected to the CO2 laser oscillator 23, and the distal end thereof protrudes from the insertion hole 14 of the insertion channel 10.

Then, as shown in FIG. 2, the insertion section 3 of the endoscope 1 is inserted from the oral cavity 20, and the distal end of the hood 16 attached to the distal end component 1 is in contact with one of the treated parts. The laser probe 22 is inserted into the operating section 2 of the endoscope 1 through the treatment instrument insertion port 21.

Further, the laser probe 22 is guided through the insertion channel 10 to the tip component 11 and protrudes from the insertion hole 14 . In this state, when the C02 laser oscillator 23 oscillates a laser, the laser light is guided to the tip via the laser probe 22, and one treated part is irradiated with the laser light from the emission end.

Therefore, the treated portion 19 will be treated with laser energy. At this time, the laser probe 22
Of the laser light emitted from the emission end of the treated area] 9
Laser light directed toward the periphery of the hood 16, that is, the inner peripheral surface of the hood 16, is absorbed by the hood 16. That is, since the hood 16 is made of highly water-containing rubber and the CO2 laser has a property of easily absorbing water, the CO2 laser is absorbed by the hood 16 surrounding the treated area 19, and the CO2 laser is absorbed by the treated area 19. does not cause thermal damage to surrounding normal tissue.

FIG. 3 shows a second embodiment, and the same components as those in the first embodiment are given the same numbers and their explanations will be omitted. In the insertion hole 14 of the insertion channel 10 provided in the insertion portion 3 of the endoscope 1, a holding stay 24 for holding the laser probe 22 is provided so as to protrude forward from the distal end component 1. A ring-shaped laser beam absorbing member 2 made of high water content rubber as a high water content substance is attached to the tip of this holding stay 24.
5 is provided.

According to this second embodiment, while the laser light absorbing member 25 is pressed against the tissue so as to surround the treated area]9,
By oscillating the CO□ laser oscillator 23, CO
The two laser beams are guided to the tip via the laser probe 22, and the treated area 19 is irradiated with the laser beam from the output end.

Therefore, the treated portion 19 will be treated with laser energy. At this time, the laser probe 22
Of the laser light emitted from the emission end of the
The laser beam directed toward the periphery of the ring-shaped laser beam absorbing member 25, that is, the inner circumferential surface of the ring-shaped laser beam absorbing member 25, is absorbed by the laser beam absorbing member 25 formed of highly water-containing rubber. That is, the CO2 laser is absorbed by the laser light absorbing member 25 surrounding the area to be treated 19, and no thermal damage is caused to normal tissue around the area to be treated 19.

FIGS. 4(a) to 4(c) show a third embodiment, and the same components as those in the first and second embodiments are given the same numbers and their explanations will be omitted. A holding stay 24 for holding a laser probe 22 is provided in the insertion hole 14 of the insertion channel 10 provided in the insertion portion 3 of the endoscope 1 so as to protrude forward from the tip component 11 . A shape memory wire 26 made of a shape memory alloy is provided at the tip of the holding stay 24. A ring-shaped laser beam absorbing member 27 made of high water content rubber as a high water content material is provided around the shape memory wire 26, and the shape memory wire 26 is straight at room temperature as shown in (a). When heated by electricity, it deforms into a ring shape as shown in (b).

Therefore, according to this embodiment, the laser light absorbing member 2
7 can be straightened as shown in (a) when inserted into the insertion channel 10, and after protruding forward from the tip component 11, it can be heated with electricity to transform it into a ring shape as shown in (b). . Then, as shown in (c), the laser light absorbing member 27 deformed into a ring shape surrounds the neck portion of the treated portion 19, such as a polyp, and is pressed against the tissue. Then, when performing treatment by guiding the Co2 laser beam to the tip via the laser probe 22 and irradiating the laser beam from the emission end to the treated area 19, the treated area]
The laser beam directed toward the periphery of the ring 9, that is, the inner peripheral surface of the ring-shaped laser beam absorbing member 27, is absorbed by the laser beam absorbing member 27 made of high water content rubber. That is,
The CO2 laser is absorbed by the laser light absorbing member 27 surrounding the treated area 19, and does not cause thermal damage to normal tissue around the treated area 19.

In addition, in each of the above embodiments, a CO2 laser was described, but the invention is not limited to a CO2 laser.
Similar effects can be obtained with other lasers. Further, the laser light absorbing member is not limited to a ring shape.

Furthermore, when observing or treating the inside of a body cavity with an endoscope, the insertion state and insertion depth of the insertion section of the endoscope may be monitored from outside the body by X-ray photography. In such cases, conventionally, although the presence of the insertion portion can be confirmed by X-ray photography, the insertion depth cannot be confirmed.

Therefore, in FIG. 5, a scale 28 is printed on the outer peripheral surface of the insertion portion 3 using a contrasting paint, that is, an X-ray opaque paint. With this configuration 28, the insertion depth can be monitored from outside the body.

In general, as a means of displaying the insertion depth of the insertion section 3, conventionally a number indicating the length has been attached so that the insertion depth can be confirmed, but FIG. 3
The outer peripheral surface of the tube is colored with the same color paint 30, and the shade is gradually changed from the distal end to the proximal end,
The depth of insertion can be confirmed by the degree of shading.

In FIG. 7, as a means of indicating the insertion depth of the insertion section 3, the outer circumferential surface of the insertion section 3 is colored with a different color paint 31 at regular intervals from the distal end to the proximal end, and the inserting section is inserted by color coding. This allows you to check the depth.

[Effects of the Invention] As explained above, according to the present invention, by providing a laser light absorbing member made of a highly water-containing substance on the emission side of the laser probe and surrounding the treated area with this laser light absorbing member, Among the laser beams emitted from the output end of the laser probe, the laser beams directed toward other than the target area are absorbed by the laser beam absorbing member made of a highly water-containing substance, which prevents thermal damage to normal tissue and protects the target area. This has the effect of ensuring reliable treatment.

[Brief explanation of drawings]

1 and 2 show a first embodiment of the invention,
FIG. 1 is a longitudinal sectional side view of the distal end of the endoscope, FIG. 2 is a diagram of its usage state, and FIG. 3 is a longitudinal sectional side view of the distal end of the endoscope showing a second embodiment of the present invention. 4 (a) to (c) show a third embodiment of the present invention, in which (a) is a side view of a laser beam absorption member at room temperature, and (b) is a side view of a laser beam absorption member in a heated state. A perspective view of the member, (C) is a usage state diagram, 5th
7 to 7 are side views of the insertion section of the endoscope. DESCRIPTION OF SYMBOLS 1... Endoscope, 3... Insertion part, 10... Insertion channel,] 6... Hood (laser light absorption member), 1
9... Part to be treated, 25.27... Laser light absorbing member. Figure 1

Claims (1)

[Claims] In an endoscope laser irradiation device that irradiates a treated area with a laser beam emitted from a laser probe inserted through an insertion channel of an endoscope and treats the treated area with the laser beam, the laser probe 1. A laser irradiation device for an endoscope, characterized in that a laser light absorbing member made of a highly water-containing substance is provided on the emission side of the treatment target area to surround the treated area.