JPS62142545A - Beam guide cable of laser apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a light guide cable that guides laser light emitted from a laser device to an irradiation section.

[Conventional technology]

A YAG laser is used as the laser beam emitted from the laser device, and when the YAG laser oscillator and the YAG laser control unit 101t are used separated by several tens of meters, the light guide cable 100 is also separated by several tens of meters.
The length of the cable 100 is required, and the routing of the cable 100 has been a problem.

Conventionally, the cable could not be rolled on the floor and was fixed to the wall, but it was troublesome to route it every time the laser was used, and the light guide fiber inside the cable could be damaged during routing. There was also a risk of the wire breaking. Therefore, it was considered that the cables should be attached to the ceiling etc. in advance.
As shown in FIG. 4, from the laser device 1 to the light guide cable 1
00 is installed in each room A, B, and C (for example, an endoscopy room, a radiology room, and two operating rooms), and each room A, B, and C can be irradiated with laser light.

[Problem to be solved]

In the conventional light guide cable 100, when the internal light guide fiber is broken, there is a risk that the broken part will burn and develop into a fire.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a light guide cable for a laser device that can quickly extinguish the break and eliminate the risk of a fire even if the light guide fiber breaks and the break occurs. purpose.

[Means for solving problems]

In order to achieve the above object, the present invention covers a light guide fiber that directly guides laser light with an inner tube, covers the inner tube with an outer tube, and fills a space between the inner and outer tubes with a fire extinguishing agent.

[Effect]

In this invention, if the light guiding fiber should break and the broken point burns, the extinguishing agent between the inner and outer tubes will enter the light guiding fiber from the burning point of the inner tube and extinguish the fire.

〔Example〕

A preferred embodiment of the invention is shown in FIGS. 1 and 2. FIG. In this embodiment, a light guide fiber 2 for guiding laser light emitted from a laser device 1 is covered with an inner tube 3, and this inner tube 3 is inserted into a metal spiral tube 4. The metal spiral tube 4 is covered with an exterior tube 5, and a fire extinguishing agent supply device 6 is provided between the interior tube 3 and the exterior tube 5.
It is filled with extinguishing agent supplied by The length of this light guide cable 10 is several tens of meters.

As the extinguishing agent interposed between the inner and outer tubes 3 and 5, nonflammable gas is suitable for use. Further, a sensor 7 is provided inside the exterior tube 5.

In this sensor 7, electrodes 7A are provided on a metal coat 3A applied to the outer peripheral surface of the inner tube 3, and lead wires 7B are connected to these electrodes 7A, and the lead wires 7B are connected to an amplifier 7C. Details of this sensor 7 will be described later. Both ends of the light guide cable 10 are connected to a connector 8.9, and an endoscope laser probe 11 is connected to the connector 9 side. Further, an assist gas supply section 12 is connected to this connector 9, and the light guide fiber 2 on the probe 11 side is cooled with the assist gas supplied from the assist gas supply section 12. The other connector 8 side has a fire extinguishing agent supply device 6.
A supply port 13 for taking in a fire extinguishing agent is provided, and the space between the inner tube 3 and the outer tube 5 is filled with the fire extinguishing agent through this supply port 13. Further, when the light guiding fiber 2 ignites and a hole is made in the inner tube 3 and the extinguishing agent enters the inner tube 3, an outlet 15 is provided to guide the extinguishing agent to the pressure switch 14.

The sensor 7 is configured as shown in FIG. 3, for example. When the light guide fiber 2 is broken in the light guide cable 10 and burned by the laser power, the coating of the light guide fiber 2 is first ignited, and then the inner tube 3 is ignited and a hole is formed in the inner tube 3. If a hole is made in the inner tube 3, the extinguishing agent filled between the inner and outer tubes 3°5 will leak into the inner tube 3.
The pressure switch 14 is activated, the control circuit 17 is activated, and the laser oscillator I of the laser device 1 is activated.
Stop the operation of A. Alternatively, the shutter 1B is closed by the control circuit 17.

If the inner tube 3 is disconnected before the pressure switch 14 is activated, the detection circuit 16 is activated and the control circuit 1 is activated.
7 to close the shutter IB or turn on the laser oscillator I.
Stop the operation of A. As this sensor 7, only one consisting of the pressure switch 14 and the control circuit 17 may be used, or only one that senses only the cutting of the inner tube 3 may be used.

〔effect〕

As explained above, in this invention, the light guide fiber that directly guides the laser beam is covered with an inner tube, the inner tube is covered with an outer tube, and a fire extinguishing agent is filled between the inner and outer tubes. If the wire breaks, ignites, and punctures the inner tube, the extinguishing agent between the inner and outer tubes will enter the inner tube and extinguish the fire. Therefore, even if the light guiding fiber were to break and ignite, there is no risk of it developing into a fire.

A cable using a metal spiral tube has improved strength and excellent protection of the light guide fiber. Furthermore, a cable with a built-in sensor provides even greater safety.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a preferred embodiment of the present invention, Fig. 2 is a front view, Fig. 3 is a circuit diagram showing an example of the sensor, and Fig. 4 shows a state in which the light guide cable is routed to each room. It is an explanatory diagram. DESCRIPTION OF SYMBOLS 1... Laser device, 2... Light guide fiber, 3...
...Inner tube, 5...Exterior tube.

Claims (1)

[Claims] 1. A light guide cable that guides laser light emitted from a laser device to an irradiation part, the light guide fiber that directly guides the laser light is covered with an inner tube, and the inner tube is covered with an outer tube. , A light guide cable for a laser device, characterized in that a fire extinguishing agent is filled between the inner and outer tubes. 2. A light guide cable for a laser device according to claim 1, wherein the inner tube is inserted into a metal spiral tube. 3. A light guide cable for a laser device according to claim 1 or 2, further comprising a sensor that detects cutting of the inner tube or intrusion of a fire extinguisher into the inner tube.