JPS61181456A - Laser probe - 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 [Technical Field of the Invention] The present invention relates to a laser glove having an improved structure for mounting a distal tip from which Raded light is emitted.

[Technical background of the invention and its problems]

In recent years, it has become possible to treat affected areas within body cavities with Rede light under observation with an endoscope (Patent Application Publication No. 57-502187). The laser glove used in this case is introduced into the body cavity through an insertion channel formed in the endoscope.

The tip of this conventional laser probe is constructed as shown in FIG. That is, the jacket chain 1
A tip fixing device 2 is attached and fixed to the tip of the tip fixing device 2, and a tip tip 4 is fitted into the tip opening 3 of the tip fixing device 2, and a claw portion 5 provided at the tip edge of the tip opening 3 is formed. The tip 4 was fixed by caulking.

However, if it is fixed by caulking like this,
Due to the temperature rise of the tip fixing device 2 due to the radar irradiation, the fitted portion of the distal tip 4 would thermally expand, loosening the fixation, and there was a possibility that the distal tip f4 would fall off during the surgery.

Furthermore, it is expected that due to repeated contact of the distal tip f4 with the body cavity wall, the caulked portion, even a small one, may loosen and fall off during the surgery.

On the other hand, the above-mentioned tip tip f4 is selected and used with different shapes depending on the purpose of treatment, but if the tip tip f4 is completely fixed as in the above conventional case, the whole radar probe must be replaced. Therefore, it is necessary to prepare a large number of expensive laser probes, which is uneconomical and rare.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to prevent the distal tip from falling off (1): to provide a laser beam with improved safety through reliable fixation; It's about doing.

[Summary of the invention]

In the present invention, the distal tip of a laser probe is fastened and fixed by the force of a fastening member made of a shape memory alloy due to its shape memory effect.

[Embodiments of the invention]

A first embodiment of the invention is shown in FIGS. 2-5. Reference numeral 11 in FIG. 2 is a laser generator, and a laser probe 13 of the present invention is connected to this output socket portion 12. This lede 7'0-fl J is inserted into the insertion channel from the channel opening 15 of the endoscope 14, and can be projected from the insertion section tip 16 of the endoscope 4.

The tip of the laser probe 13 is constructed as shown in FIG. That is, a tip fixture 18 is fixedly attached to the tip of the outer chain 17, and a tip f19 is attached to the tip fixture 18. Further, the tip portion of the light guide fiber 20 is fitted into the chip fixture 18 and the installation is fixed, and the radar light emitted from the tip of the light guide fiber 20 is transmitted to the tip tip 7.
The light is emitted to the outside through 19°. The tip tip 7"19 is made of a transparent ceramic material such as alumina, and forms a conical tip 2 that focuses and emits the radar light, and the base end has an outer circumference of the same diameter. is a portion 22.The fitting and attachment is performed by fitting the portion 22 into the chip fixing tool 18 and fixing the attachment.

The chip fixture 18 is made of Ni-Tl alloy, Cu-Zn.
- It is formed of a shape memory alloy such as an At-based alloy. A tip opening 23 is formed in the tip portion into which a portion 22 for fitting and mounting the tip tip 19 is fitted;
The peripheral wall portion 24 of this tip opening 23 is used as a fastening member. That is, the heat treatment is performed so that the shape of the tip opening 23 in the initial memory state is in a constricted state with a small opening diameter as shown in FIG. The crystal structure at this high temperature side forms an austenite phase, which corresponds to the memory shape. Then, by cooling from this high-temperature phase side, the martensite phase (more precisely, the twin martensite phase) is changed while keeping the same shape. Next, in this state, as shown in FIG. 5, the peripheral wall portion of the tip opening 23 is pushed outward to form an open shape. To fit and install the distal tip 19 into the open distal opening 23, the section 22 is fitted. Then, this tip opening 23 is heated to a temperature equal to or higher than the A4 point (austenite phase transition end temperature). As a result, the deformed martensite phase returns to the original austenite phase, and the fitting and attachment forcefully squeezes the portion 22 in an attempt to restore the tip opening 23 having the shape shown in FIG. This ensures reliable holding and fixing.

For example, if the As point (austenite phase transition start temperature) is set to 0°C, under the normal environment conditions, a force is always applied to the tip 19 to tighten it, and its retention state is ensured. be done.

According to the above configuration, when fitting and installing the tip tip f19, a tightening force is always applied to the portion 22 by the peripheral wall portion of the tip opening 23 of the tip fixing device 18, so that the tip tip f19 is fitted and attached by 7 degrees.
There is no danger of 19 falling off.

In addition, if the distal tip 19 hits another object during or outside of the surgery and is damaged, another type of distal tip 19 may be used.
If you want to replace it with No. 19 (for example, a flat tip is used for hemostasis), do so as follows. In other words, the tip fixture 18 is cooled to a temperature below the As point, and an external force is applied to the tip opening 23 to cause the peripheral wall 24 to 8.
By unfolding it as shown in Figure g5, the distal tip 19 can be easily removed. Then, attach another necessary tip tip 7° 19 using the same procedure as described above.

6 to 8 show a second embodiment of the invention. In this embodiment, a fixing ring 30 made of a shape memory alloy is provided as a separate member from the chip fixing device 18, and this is used as a fastening member. That is, the fixing ring 30 is fitted over the tip fixing device 18 and the distal tip 19 that are butted against each other, and is tightened and fixed by the same shape memory effect as in the above embodiment. To insert the fixing ring 30, as shown in FIGS. 7 and 8, the inner diameter of the fixing ring 30 is expanded at a temperature below point A3, and the ring is inserted from the tip end 7° 19 side. Then, by heating above the Af point, the shape is restored as shown in FIG. 6, and the tip fixing tool 18 and the tip tip 7'' 19 are tightened and fixed.

As shown in FIG. 9, if a notch 3 is formed in a part of the fixing ring 30, the force required to expand the inner diameter during insertion is at least as good as possible.

FIG. 10 shows a third embodiment of the invention. In this embodiment, the peripheral wall 24 of the tip opening 23 of the tip fixture 18 is formed thinly so that it can be deformed, and a plurality of locking protrusions 25 are provided on the inner surface of the peripheral wall 24 along the circumferential direction. It was formed by Further, a fixing ring 30 similar to that of the second embodiment is fitted on the outer periphery of the tip opening 23, and the shape memory effect of this fixing ring 30 tightens the peripheral wall 24, and the locking protrusion 25 tightens the fixing ring 30. Tightening is to fix the tip tip 9.

11 to 13 show a fourth embodiment of the present invention. In this embodiment, the tip opening 23 of the tip fixture 18 of the first embodiment is flattened, and the peripheral wall thereof is provided with a plurality of claws 40. The initial memorized shape of the claw portion 40 is bent inward as shown in FIG. I'll leave it as that. Further, at temperatures below the Am point, the claw portions 40 are deformed outward by external force and kept in an expanded state, as shown in FIGS. 12 and 13. Then, the tip tip f19 is fitted and installed in the claw part 40 in this expanded state at part 2.
2 is fitted and heated above the Af point temperature to restore the state shown in FIG. 11 to fix the tightening.

〔Effect of the invention〕

As explained above, according to the present invention, the tip tip can be reliably held by force when tightening due to the shape memory effect. Therefore, the distal tip is prevented from falling off, and its safety can be improved. In addition, the tip can be attached and removed, so
There is no need to prepare a radar probe for each type of tip tip.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing the tip of a conventional radar probe, FIG. 2 is a perspective view showing the first embodiment of the present invention in use, and FIG. 3 is a side sectional view of the tip. 4 and 5 are respectively side sectional views of the tip fixing device, FIGS. 6 and 7 are respectively side sectional views of the distal end of the second embodiment of the present invention, and FIG. 8 is a side sectional view of the tip fixing device. In the figure I[X-II
9 is a sectional view of a modification of the second embodiment, FIG. 10 is a side sectional view of the tip of the third embodiment of the present invention, and FIG. 11 is a cross-sectional view of a modification of the second embodiment. A side sectional view of the tip of the fourth embodiment, FIG. 12 is a side sectional view of the tip fixture,
FIG. 13 is a front view of the chip fixture. 13... Laser probe, 19... Tip tip, 2
2... Fitting and mounting part, 24... Surrounding wall part, 30... Fixing ring, 40... Claw part. Applicant's Representative Patent Attorney Atsushi Tsuboi Figure 1 Figure 2 Figure 3 Figure 114 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11

Claims (1)

[Claims] In a laser probe in which a tip fixing device is provided at the tip of the probe, and a translucent tip is attached to the tip fixing device, a fastening member made of a shape memory alloy is provided on the tip fixing device, and this fastening member A laser probe characterized in that the tip is fastened and fixed by a shape memory effect when heated above the austenite phase transition end temperature.