JPH0322768B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an endoscopic treatment tool in which a treatment member having a tip with a biased sharpened portion is inserted into a mantle tube.

[Prior art] An endoscopic syringe is one of this type (Utility Model Application No. 57-126201), in which a tip needle is attached and fixed to the tip of a flexible injection tube. It is configured to be inserted into a flexible mantle tube.

[Problem that the invention seeks to solve]

Incidentally, the injection tube and the mantle tube are each made by cutting a long tube material into a predetermined length. However, since the tube material used as this material is long and has been stored and transported rolled into a circle, it always has a tendency to bend. Therefore, if you unconsciously use something with this bending tendency and attach the tip needle to the tip of the injection tube, the uneven pointed part B of the tip needle A will bend the tip of the injection tube C, as shown in Figure 7. Some are installed so that the curve of the habit faces outward.

If the injection tube C with the tip needle A attached is inserted into the mantle tube D, which also has a tendency to bend, in such a state, the direction of the bending tendency of the injection tube C and the direction of the bending tendency of the mantle tube D will coincide. As a result, it was found that because the tip needle A and the sharp point B move along the curved inner wall surface of the mantle tube D, the tip needle A may pierce or damage the inner surface of the mantle tube D.

One way to avoid this is to remove the bending of the tube material and straighten it before use. However, this method requires a great deal of labor and cost for correction, making it uneconomical.

The present invention has been made in view of the above-mentioned problems, and even if the mantle tube and the long member inserted therein have a tendency to bend, the simple structure prevents the uneven tip from getting caught and allows smooth movement. Another object of the present invention is to provide an endoscopic treatment instrument that can be inserted reliably.

[Means for solving problems]

A treatment portion 4 having a biased sharpened portion 6 is provided at the distal end of a flexible elongated member 3 that is inserted into a flexible mantle tube 2 that has a tendency to bend. 4 is an endoscopic treatment instrument configured such that the sharpened portion 6 is disposed toward the inside of the curve of the elongated member 3.

[Effect]

Since the flexible elongated member 3, which also has a tendency to bend, is inserted into the flexible mantle tube 2, which has a tendency to bend, the directions of the bends match, and accordingly, the treatment section 4
The biased pointed portion 6 is regulated in a state where it retreats from the inner wall of the mantle tube 2, and moves forward and backward while maintaining this state.

〔Example〕

1 to 3 show a first embodiment of the invention. An endoscopic syringe 1 shown in this embodiment includes a flexible mantle tube 2, and an injection tube 3, which is also a flexible elongated member and is inserted into the mantle tube 2 so as to be freely advanced and retracted.
These are all made of Teflon, for example, and have an arcuate bend. An injection needle 4 serving as a treatment section is attached to the tip of the injection tube 3. The injection needle 4 is made of a hard metal pipe, and its tip portion is cut off obliquely to form a needle tip 5. That is, the sharp point 6 of the needle tip 5 is biased toward the inside of the curve of the injection tube 3.

When the injection tube 3 is inserted into the mantle tube 2, the direction of the curve of the injection tube 3 is regulated to match the direction of the curve of the mantle tube 2, as shown in FIG. move on. Therefore,
The sharp portion 6 of the needle tip 5, which is biased toward the inside of the curve of the injection tube 3, advances while retreating to the inside of the curve, as shown in FIG. In other words, the state away from the inner wall of the mantle tube 2 is maintained. Even if the inner wall of the mantle tube 2 is touched, only the abdomen 7 of the needle tip 5 touches it. Therefore, when inserting the injection tube 3 into the mantle tube 2, the sharp point 6 of the injection needle 4 will not get caught or pierce the inner wall of the mantle tube 2. Therefore, the inner wall of the mantle tube 2 will not be damaged or pierced. Furthermore, since there is no catch, the resistance force during insertion is small and the insertion can be done easily.

In addition, in this configuration, even if the long flexible tube material that is the material for the mantle tube 2 and the injection tube 3 has a tendency to bend due to being stored or transported rolled, it can be cut as is. It can be used as In other words, there is no need to correct each bending tendency of the tube material. Therefore, production costs can be reduced.

FIG. 4 shows a second embodiment of the invention. In this embodiment, the distal end portion of the mantle tube 2 is made thinner and this portion is used as the locking portion 11. Further, a cylindrical tip 12 is attached and fixed to the outer periphery of the tip portion forming the locking portion 11. On the other hand, for example, a ring-shaped member is provided at the proximal end of the injection needle 4 near the tip of the injection tube 3 to provide an abutment part 13, and this abutment part 13 abuts against the locking part 11. It's becoming like that. However,
When the injection tube 3 is advanced, the tip of the injection needle 4 protrudes from the opening at the tip of the mantle tube 2, and the locking portion 11
The abutting portion 13 abuts against the protrusion and restricts the protrusion amount to an appropriate amount.

FIG. 5 shows a third embodiment of the invention. In this embodiment, the injection needle 4 is bent along the same curvature of the injection tube 3. In this way, the sharp point 6 of the needle tip 5 is sufficiently retracted from the inner wall of the mantle tube 2 and is positioned toward the center of the mantle tube 2.

FIG. 6 shows a fourth embodiment of the present invention. In this embodiment, the locking portion 11 in the second embodiment is formed only on the inside of the curve of the mantle tube 2. In this way, since there is no protruding step on the inner side of the mantle tube 2 where the sharpened portion 6 of the needle tip 5 moves, it is possible to prevent the sharpened portion 6 from getting caught.

In addition, in the present invention, the sharpened portion of the treatment portion may be disposed so as to be biased toward the inside of the curve of the curve of the elongated member, and it is not necessary to accurately face the center of curvature of the curve as in the above embodiment. However, in the range of the cross section of the elongated member, it is desirable that the elongated member be located closer to the center of curvature of the bending tendency than the center of the elongated member.

〔Effect of the invention〕

As explained above, in the present invention, when the elongated member is inserted into the mantle tube, the sharp end of the treatment section does not catch or pierce the inner wall of the mantle tube. Therefore, the inner wall of the mantle tube will not be damaged or pierced. Furthermore, since there is no catch,
The resistance force during insertion is small and it can be inserted easily.

[Brief explanation of drawings]

Fig. 1 is a side sectional view showing the vicinity of the tip of the first embodiment, Fig. 2 is a side sectional view showing the vicinity of the tip of the injection tube of the same embodiment, and Fig. 3 is a side sectional view of the injection tube of the same embodiment. Front view showing the vicinity of the tip, No. 4
The figure is a side sectional view showing the vicinity of the tip of the second embodiment, FIG. 5 is a side sectional view showing the vicinity of the tip of the third embodiment,
FIG. 6 is a side sectional view showing the vicinity of the tip of the fourth embodiment, and FIG. 7 is a side sectional view of the conventional one. DESCRIPTION OF SYMBOLS 1... Syringe, 2... Mantle tube, 3... Injection tube, 4... Syringe needle, 5... Needle tip, 6... Pointed part, 11... Locking part, 13... Contact part.

Claims (1)

[Scope of Claims] 1. A flexible mantle tube with a tendency to bend, a flexible elongate member with a tendency to bend, which is inserted through the mantle tube,
and a treatment section provided at the distal end of the elongated member and having a tip with a biased tip, and the pointed section of the treatment section is arranged to be biased toward the inside of the curve of the elongate member. An endoscopic treatment instrument characterized by: 2 A locking portion is provided at the tip of the mantle tube, and further,
The endoscopic treatment instrument according to claim 1, further comprising an abutting portion that abuts the locking portion near the tip of the elongated member excluding the sharpened portion. 3. The endoscopic treatment instrument according to claim 1 or 2, wherein the member constituting the treatment section is bent in the same direction as the elongated member. 4. The endoscopic treatment instrument according to claim 2, wherein the locking portion is provided only on the outside of the curve of the mantle tube.