JPH0623803B2 - How to install the conductor - Google Patents

Description

The present invention relates to a method for attaching a lead wire, and particularly to a lead having a low melting point which is attached to the outer periphery of a medical optical fiber or the like and constitutes a breakage detection circuit for the optical fiber. The present invention relates to a method of attaching a conductor such as a wire.

In the field of medical equipment, various lasers are used, and among them, a YAG laser or the like that generates a high output is used as a light source of a surgical laser knife for making an incision on an affected part, and an abnormality from an incised part It is also used in hemostatic devices to stop bleeding.

Such a surgical laser scalpel and a hemostatic device are generally a laser light source and an irradiation device that directly irradiates the affected area with laser light,
The laser light emitted from the laser light source is transmitted to the irradiation device.

An optical fiber is used as a means for transmitting this laser light. For example, a medical optical fiber used in a hemostatic device for stopping abnormal bleeding in the body as described above has a diameter of about 10 mm.
A laser beam having a very high level of light energy of about 100 W is made incident from a laser light source into an extremely thin core of about 0 to 500 μm, transmitted to the irradiation device, and directly to the affected area via the irradiation device. Irradiation is used to stop bleeding.

By the way, if the optical fiber that transmits such a high level of optical energy should be damaged during the treatment, the laser light will be scattered and leaked from the damaged part, and the high level of optical energy will cause normal operation. There is a risk of damage to the cells and serious injury.

In addition, the leaked laser light may damage the device.

Therefore, in the conventional medical optical fiber device, in order to prevent such a danger, when the optical fiber is damaged or broken, it is immediately detected and various breakage detections for stopping the oscillation of the laser light are detected. I am taking steps.

FIG. 1 is a schematic explanatory view showing an example configuration of the optical fiber F. In this example, a plurality of conductors D made of a low-melting metal wire or metal foil are attached to the outer circumference of the optical fiber F. The conductor D constitutes a part of the breakage detection circuit, which is burned off by the thermal action of the light energy of the laser light scattered and leaked from the break point of the optical fiber F to break the wire. At the same time as detecting the disconnection of the fiber F,
It is supposed to stop the oscillation of the laser light.

That is, in FIG. 1, reference numeral 1 denotes a control device that constantly supplies a signal current to the conductor D to detect breakage thereof and to stop oscillation of laser light. A breakage detection circuit is formed by connecting the conductors D, which are additionally provided, to the light incident side and the light emitting side through conducting wires R and R ′ such as lead wires for extraction. Further, 2 is a laser oscillator as a light source of a surgical laser knife, for example, when the optical fiber F is broken and one of the conductors D is broken, the laser beam is oscillated by a signal emitted from the control device 1. It is designed to be stopped.

When the optical fiber F is damaged or broken, and the laser light leaks from the area, the thermal action thereof melts the low-melting-point conductor D forming a part of the breakage detection circuit. The signal current supplied from the conductors R and R'attached to both ends of the conductor D that has been disconnected is interrupted. As a result, the control device 1 detects the occurrence of breakage of the optical fiber F, and at the same time, stops the oscillation of the laser light from the laser oscillator 2 in response to the detection signal to prevent an accident due to the leakage of the laser light.

By the way, the conductor D that constitutes such a breakage detection circuit
Conventionally, the means shown in FIG. 2 has been used to connect the wire and the lead wire R (R ') to each other.

That is, FIG. 2 is a cross-sectional view showing a conventional method of attaching the conductor R to the conductor D, in which the conductor D extending along the longitudinal direction on the outer circumference of the optical fiber F is the circumferential direction of the optical fiber F. A plurality of them are installed in parallel at the required intervals.

Then, at a predetermined conductor attachment position of each conductor D, the conductor R with the insulating coating layer 3 peeled off along the longitudinal direction of the conductor D.
The core portions 4 of the optical fibers are arranged so as to be overlapped with each other, and in this state, the tips of the core portions 4 are bonded to the conductor D by the soldering 5, and the conductors R are secured while mutually insulating the optical fibers. In order to fix and integrate with F, the thermosetting resin 6 such as an epoxy resin is centered on the core portion 4 of the soldered conductor R and extends to the covered portion of the insulating coating layer 3. Is applied, and the entire mounting portion of the conductive wire R is covered with the thermosetting resin 6.

However, as described above, the medical optical fiber F is extremely thin with a diameter of about 100 μm, and the conductor D additionally provided on the outer periphery thereof has a width of about 100 μm in order to enhance the accuracy of breakage detection. Therefore, it is very difficult to solder the core wire portion 4 of the conductor wire R while securing the insulation between the conductors D as described above, because it is selected extremely narrowly and a plurality of wires are arranged. The product failure rate was extremely high.

Further, since the conductor D itself is also composed of a kind of low melting point solder, if the working temperature is wrong when the soldering 5 is applied to the conductor D, the conductor D may be melted and broken. Was needed.

Further, according to the conventional method as described above, a phenomenon occurs in which the insulating coating layer 3 of the conductive wire R is hardened in the vicinity of the boundary with the thermosetting resin 6, so that an external force applied to the conductive wire R during assembly or during use of the device is unreasonable. Therefore, there is a problem that the conductor wire R is broken near this boundary.

Therefore, the present invention has been made in view of such a situation, and is for drawing out without using solder to a low-melting-point conductor that is attached to the outer circumference of an optical fiber and forms a part of the breakage detection circuit. Conductors such as lead wires can be easily and surely attached, and the insulation state between conductors and conductors can be reliably maintained, and the conductors caused by the conventional insulation treatment between conductors can be prevented. It is an object of the present invention to provide an extremely reliable method of attaching a conductive wire that does not cause a disconnection failure, and thereby reliably prevent a personal injury or the like due to breakage of a medical optical fiber or the like.

In order to achieve this object, the present invention provides a method for attaching a conductor to a conductor having a low melting point, which is attached to an outer periphery of an optical fiber and constitutes a part of a breakage detection circuit of the optical fiber, By arranging a conductive wire at a predetermined mounting position so as to overlap the conductor, and in this state, a heat-shrinkable resin tube is externally fitted so as to cover the mounting position, and then the heat-shrinkable resin tube is heat-shrinked. It is characterized in that the conductor wire is attached to the conductor by pressure bonding.

Hereinafter, the present invention will be specifically described based on the embodiments shown in the drawings.

FIGS. 3 (I) and (II) are cross-sectional views showing an example of a method of attaching a conductor according to the present invention, in which the same parts as those in FIG. 2 are designated by the same reference numerals and the detailed description thereof is omitted. .

In this embodiment, a so-called jacket layer 7 made of an insulating material such as nylon or fluororesin is formed on the outer peripheral surface of the optical fiber F, and the surface of the jacket layer 7 is made of a metal foil which is a kind of low melting point solder. The conductor D is also attached.

Then, the insulating coating layer 3 at the end of the conducting wire R is peeled off to expose the core wire portion 4, and then the core wire portion 4 is provided at a predetermined mounting position along the longitudinal direction of the conductor D in a substantially central portion thereof. They are arranged so as to overlap each other, and in this state, as shown in FIG.
A heat-shrinkable resin tube 8 made of, for example, a polyolefin resin is externally fitted so as to cover the mounting position of the lead wire R around the center, and then a heating device such as a so-called hot jet is used as shown in FIG. 3 (II). The heat-shrinkable resin tube 8 is heated and shrunk, and the respective contraction force attaches each conductor R to each conductor D by pressure bonding.

As described above, according to this embodiment, the conductor R is attached to the conductor D without using solder,
There is an excellent effect that the conductor wire R can be easily and surely attached without requiring a high degree of special skill as in the case of the conventional method, and thus the defective rate of the product is significantly reduced.

Further, the core wire portion 4 from which the insulating coating layer 3 of the conductor wire R is peeled off,
Since the heat-shrinkable resin tube 8 is completely covered and pressure-bonded, the core wire portion 4 is adjacent to the conductor wire R.
Accidents that short-circuit by contacting the core wire portion 4 and the conductor D are reliably prevented.

Further, when a polyolefin resin tube having rubber elasticity is used as the heat-shrinkable resin tube 8 as in this embodiment, a phenomenon occurs in which the insulating coating layer 3 of the conductor R hardens near the boundary with the heat-shrinkable resin tube 8. Even if the rubber elasticity causes a slight unreasonable force on the conductor R, the conductor R hardly breaks near the boundary.

Further, since the optical fiber F is extremely thin, it is difficult to directly attach a plurality of conductors D to the surface thereof,
As in the present embodiment, the jacket layer 7 is formed on the outer peripheral surface of the optical fiber F.
If the surface area is increased by forming the, there is a processing convenience that the work can be performed relatively easily.

In the above-described embodiment, when the conductor D and the conductors R attached to the conductor D are relatively large in number, the core portion 4 of the conductor R is overlapped with the conductor D in the substantially central portion along the longitudinal direction. After the conductors R are temporarily fixed to the optical fiber F by using, for example, a thin metal wire or a plastic string in the state of being arranged together, the heat-shrinkable resin tube 8 is externally fitted as shown in FIG. 3 (I). Good to do.

Further, in the above-described embodiment, the case where the conductors D are provided in parallel with each other along the longitudinal direction of the optical fiber F has been described, but the present invention is not limited to this, and for example, the conductor D is an optical fiber. The present invention can also be applied to a case where the fiber F is spirally wound around the outer circumference of the fiber F.

As described above, according to the method of the present invention, a conductor having a low melting point, which is attached to the outer circumference of a medical optical fiber or the like and constitutes a breakage detection circuit of the optical fiber, has a conductive wire such as a lead wire for extraction. Are stacked at a predetermined mounting position, and in this state, solder is not used as in the past, but a heat-shrinkable resin tube is externally fitted to cover the mounting position, and then the heat-shrinkable resin tube is heated. Since the conductor wire can be attached to the conductor simply by contracting it, the conductor wire can be attached easily and reliably without requiring special special skill as in the past, and at the same time, the defective rate of the product is greatly reduced. However, it has an excellent effect that an extremely reliable medical optical fiber device can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an example of an optical fiber breakage detection means applied to a medical optical fiber device, etc., and FIG. 2 is a sectional view showing a conventional method of attaching a conductor, FIG. 3 (I) and (I
Each of (I) is a cross-sectional view showing a method of attaching a conductor wire according to the present invention. Explanation of symbols F ... Optical fiber, D ... Conductor, R ... Conductor, 3 ...
Insulating coating layer for conducting wire, 4 ... Conductor core portion, 8 ... Heat-shrinkable resin tube.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiyuki Iwashita 2-32-24 Takaracho, Katsushika-ku, Tokyo

Claims (1)

[Claims] 1. A method of attaching a conductor to a low-melting-point conductor attached to the outer periphery of an optical fiber and forming a part of a breakage detection circuit of the optical fiber, wherein the conductor is attached at a predetermined attachment position. The conductor is placed on the conductor, the heat-shrinkable resin tube is externally fitted so as to cover the mounting position in this state, and then the heat-shrinkable resin tube is heat-shrinked so that the conductive wire is applied to the conductor. A method of mounting a conductor characterized by crimping and mounting.