JPS60246745A - Basket shaped grip forcept - 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 socket-type grasping forceps for transendoscopically retrieving foreign bodies in a body cavity, such as biliary stones and ureteral stones.

[Technical background of the invention and its problems]

Conventional/socket-type gripping forceps have a structure in which a socket, which is made by connecting and fixing the tips of a plurality of elastic wires, is moved in and out of the tip of a flexible tube. therefore,
Once the nose socket is opened by protruding it, a stone or the like is placed in the nose socket, and once it is grasped by pulling it with the operating wire, it is impossible to shake out the stone or the like because it is inside the narrow body cavity. In particular, be sure to grasp stones, etc.!
When trying to squeeze the tube, the proximal part of the elastic wire pulled into the tip of the tube digs into the inner periphery of the tip. If you put out 1 Tsukuda, you can't charge. In this way, with the conventional device, it was extremely difficult to release the stone once it was grasped out of the sket.

Therefore, when a stone is grasped by inserting the Nonosket type grasping forceps beyond a constriction in a body cavity, if the grasped stone is too large, it may not be able to easily pass through the constriction. Additionally, there were other problems, such as the need for incisional surgery in some cases.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide a slotted gripping forceps that ensures safety by making it possible to easily release the gripped forceps inside the body cavity by remote control. Our goal is to provide the following.

[Summary of the invention]

1. The present invention is a slit-type grasping forceps provided with a means for releasing the binding at the tip of the elastic wire constituting the slit by remote control from the hand side.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

In FIG. 1, reference numeral 1 denotes an end tube, which is a flexible tube that can be inserted into an insertion channel of an endoscope (C not shown).

A liquid feeding port brass tube 2 is connected to the base end of this guide tube 1, and an operating section 3 is further connected via this liquid feeding port brass tube 2.The operating section 3 includes a slider 4 and a main body that guides the slider 4. 5, and the slider 4 can be moved with a finger. Further, a liquid inlet 6 communicating with the flexible tube 1 is formed in the liquid feeding port brass tube 2 .

Also, inside the guide tube l, that l'tl! A flexible operating wire 2 is inserted through the entire length so that it can move forward and backward. The base end of the operating wire 7 is hooked to the slider 4 of the operating section 3, and when the slider 4 is moved forward or backward, the operating wire 2 is connected to the guide tube 1.
It is designed to advance and retreat inside.

On the other hand, a basket 9 for grasping a foreign object 8 in the body cavity is connected to the tip of the operating wire 7. This basket 9 comprises a plurality of elastic wires, namely two short wires 10.
10 and two long wires 1.1 and 1, especially long wire 1.

11 are each covered with an insulating material 12 such as an electrically insulating synthetic resin. Also, as shown in FIGS. 2 and 3, each wire 10, JO, 11,.

The tip end portion of No. 1 is bound and fastened by a cap-shaped binding member 13. That is, long wire J
The insulating material 12 at the tip portions of the short wires 10 and 11 is peeled off, and a receiving member made of electrically insulating synthetic resin or the like is used to prevent electrical short-circuiting between this exposed portion and the tip portion of the short wire 10.10. 14, and are further bound by tightening the binding member 1'3 on the outside.

By the way, the binding member J3 is made of a shape memory alloy, for example, Cu-Zn-AL or Ti-Ni.
Ir) In the crystal structure of the high-temperature phase, the above-mentioned receiver is four long and short wires 10, 10, Z'1 bundled on the member 14.

It has an inner diameter that is equal to or larger than the outer diameter of the envelope circle of IZ, but is plastically deformed at room temperature (i.e.

Caulk firmly. ) and each of the above wires 10°10.11
．． The distal end portion of II and the receiving member J4 are frictionally bound together. That is, in this state, the crystal structure of the binding member 13 undergoes martensitic transformation and becomes a martensitic phase. In addition, the shape memory alloy forming this binding member 13 has a temperature at which reverse transition starts from the martensitic phase to the parent phase (As
), the end temperature (Af) is the human body temperature (approximately 36° to 37°C
) The material is selected so that it can be set at a temperature exceeding ).

Further, the respective tips of the long wires 11.11 are electrically connected via the binding member 13. Then, the electric current supplied from one long wire 11 is passed through the binding member 13 and returned to the other long wire 11, and at this time, the electric current is weakened by the Zeal heat flowing through the binding member 13. It's pure.

Furthermore, the proximal ends of the long and short wires 10, 10, 11.degree. 11 are bound together by a covering tube 15, as shown in FIG. In particular, the long wires 11, 11 are extended up to f and are bundled with the covering tube 15 to constitute the operation wire 7. The base end side of the long wire 11.11 constituting the operation wire 7 is connected to the slider 4.
are electrically connected to contacts 16 and 16 provided in the respective terminals.

Therefore, when using the gripping forceps, the nose slot 9 is pulled and stored in the guide tube 1, and then the guide tube 1 is inserted into the insertion channel of the endoscope inserted into the body cavity. Bring the tip of the body close to the foreign object 8 in the body cavity to be grasped. Now, by pushing the slide/4 of the operating section 3 toward the distal end, the operating arm 1 protrudes the slide 9 from the distal end of the guide tube 1 through the ear 7. It opens into a basket shape due to its own elastic restoring force, and foreign matter 8 is taken into the inside through the gaps between the long and short wires 10.1'0, 11, 11. Once the foreign object 8 has entered, pull the slider 4 of the operating section 3 backwards to draw the Nonosket 9 to the mouth of the guide cheep 1, and then further pull the slider 4 strongly to contract the Nonosket 9. As shown in FIG. 1, the foreign object 8 is securely held.

In this state, the endoscope is pulled out of the body cavity and the foreign object 8 is removed.

By the way, since a foreign object 8 such as a stone usually occurs in a narrow body cavity, the foreign object 8 may be grasped beyond the stenosis, but the foreign object 8 is too large to pass through the stenosis. happens. In this case, it is necessary to release the grasped foreign object 8, but it is difficult to shake it off, and if the foreign object 8 is bitten into the guide tube 1 at the proximal end, the sket 9 cannot be pushed out again.

Therefore, in this case, when a high frequency power source is connected to the contacts 16, 16 and a high frequency current is supplied, the binding member 131/C flows through one long wire 11 and passes to the other long wire 1. As a result, the binding member 13 undergoes reverse transformation as its temperature rises higher than the Geel heat i at that time, and its crystal structure returns to its parent phase, returning to its shape before plastic deformation. Therefore, the inner diameter of the binding member 13 is increased, and each short wire 10
, 10, 11. Release the binding of 11.

When the grasping forceps are pulled toward the user, the foreign object 8 is squeezed into the stenosis and released into the body cavity.

Note that the foreign object 8 can be recovered by making a necessary incision in the narrowed area to widen it and attempting to recover the foreign object 8 again. As this unbinding means, the tip binding material is made of a shape memory alloy, and it is heated by an energizing means that also functions as an operation wire and a nose socket, so as the device becomes larger, the ease of insertion and operability is impaired. I don't sing. In addition, since it uses a high-frequency power source that can be used in common with knives for incising pinched areas, it is economical and does not cause any electrical shock to the human body.

There is no risk of causing damage.

FIG. 5 shows another embodiment of the invention. In this embodiment, the binding member 13 at the tip and the insulating material 12 are integrated, and these are connected to the short wires 10, 10 and the long wires 11, 11.
If any part of the binding member 13 is fixed by welding or the like, even after the above-mentioned unbinding operation, the binding member 13 will not fall into the body cavity and can be retrieved from the body as it is, increasing safety. This is yet another embodiment.

In this embodiment, one of the long wires 11 is made of a shape memory alloy, and this tip 11a is connected to the tip of the short wire 10°10 and the tip of the other long wire 11. If the wires are straight and the binding state is in the martensitic phase, the binding is released by simply energizing the binding circumference wire 11 in the same way as described above. In this way, the number of members is reduced, the cost is low, and the binding member 13 does not remain in the body cavity, making it safe.

Note that the long wire 11. 'Ul may be one continuous wire.

Further, FIGS. 7 and 8 show further different embodiments of the present invention. In this case, a basket 9 is provided by wires 21 made of a shape memory alloy, each of which becomes an open state (FIG. 8) by heating the tip of the tube 1 with electricity.
Power transmission lines 22, 22 for supplying electricity to the wires 21 are buried within the wall of the tube 1. Also,
The tips of each wire 21 are bound by a binding member 23 made of a shape memory alloy, as in the above embodiment shown in FIG. Moreover, this binding heather member 2 J As+Af is made of a shape memory alloy having a higher composition than As and Af of the wires 2 . . . forming the above-mentioned studs 9.

Therefore, the wire 21 of the basket 9... would require a long time or a large current to be transmitted from the hand side through the power transmission lines 22 and 22 to open it. In this embodiment, the electric heating means can be used for the two purposes of opening and closing the stud 9 and re-releasing the foreign material once gripped. This makes it possible to simplify the device and provide high functionality at low cost.

〔Effect of the invention〕

As explained above, in the present invention, the binding at the tip of the wire constituting the no.zeta.sket can be released by remote control from the operating section, so that foreign matter can be reliably ejected and is safe.

In addition, since we adopted a method in which the foreign object is re-released by releasing the binding at the distal end, unlike the method in which the proximal end is released, when the foreign object is released and after the binding is released, when the forceps are removed from the body cavity, the wire of the sket It is extremely safe as there is no risk of the end of the body getting stuck in the body wall.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a grasping forceps showing an embodiment of the present invention, Fig. 2 is a side sectional view of the distal end portion of the sketch F portion, and Fig. 3 is a side sectional view of the proximal end portion of the basket portion. figure,
FIG. 4 is a cross-sectional view taken along the line ■-■ in FIG. 1, FIG. In the example -・
7 and 8 are side sectional views of the vicinity of the tip in still other different embodiments of the present invention. 1... Guide tube, 7... Operation wire, 8...
・Foreign object, 9...Nonosket, 10...Short wire,
11... Long wire, 13.23... Binding member. Applicant's agent Patent attorney Atsushi Tsuboi

Claims (2)

[Claims] (1) A guide tube, an operation wire that is inserted into the guide tube so as to be freely advanced and retractable and that can be operated forward and backward at the operation section on the base end side of the guide tube, and the operation wire
a nose socket which is connected to the guide tube and is provided so as to be able to protrude and retract from the distal end portion of the guide tube, and is made of a plurality of elastic wires, and the tips of the elastic wires are tied together;
A Nonoskut-type grasping forceps characterized by comprising means for releasing the binding of the tips of the elastic wires constituting the scat by remote control from the operating section side. (2) The above-mentioned binding part in the form of a means for binding the tips of the elastic wires with a gripping force when the crystal structure is in the martensitic phase using a binding member made of a shape memory alloy, and releasing the above-mentioned binding.'' −vv + 1 −1
+I + -□ Curved Mine ＾ Lu The passke according to claim 1, characterized in that the gripping force is weakened.
G-shaped gripping forceps.