JPH0591686U - Endoscope syringe - Google Patents

Abstract

(57) [Summary] [Object] The present invention provides an injector for an endoscope, which can secure a constant amount of projection of an injection needle, prevent the needle from wobbling during puncture, and perform accurate puncture. In an endoscope injector in which an operating section and a puncture section are connected via a double tube consisting of an inner and outer tube, a protrusion amount of an injection needle 3 provided at a tip of an inner tube 4 is set. A protrusion amount restricting member 8 for maintaining a constant amount is provided at the tip of the outer tube 2, and the protrusion movement amount of the injection needle is the side face 1 of the stopper 11.
2 and the inner surface 10 of the protrusion amount restricting member are slidably engaged with each other to be restricted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an endoscope injector, and more particularly to an endoscope injector that is inserted into a body endoscopically and injects a drug solution or the like into an affected area.

[0002]

[Prior Art]

 Conventionally, an endoscope injector has its operating portion and puncture portion connected via a double tube consisting of an inner tube and an outer tube, and its injection needle is provided at the tip of the outer tube. The stopper provided on the injection needle side of the tip member simply abuts in the axial direction to regulate the amount of protrusion of the needle from the tip of the outer tube of the injection needle for an endoscope.

[0003]

[Problems to be solved by the device]

 However, since the projection amount restricting means of the injection needle in the conventional endoscope injector described above has a structure in which the stopper provided on the injection needle side is simply brought into contact with the tip member provided at the tip of the outer tube, There was a drawback in that the needle wobbled during puncture, making it impossible to accurately puncture the target affected area.

Therefore, in view of the above-mentioned problems, an object of the present invention is to provide an injector for an endoscope which can secure a constant protrusion amount of a needle, can prevent the needle from wobbling during puncture, and can perform accurate puncture. To provide.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a syringe for an endoscope in which an operation part and a puncture part are connected via a double tube consisting of an inner and outer sheath tubes, which is provided at the tip of the inner sheath tube. A protrusion amount regulating member for keeping the amount of protrusion of the injection needle constant is provided at the tip of the outer tube, and the movement amount of the injection needle causes the side face of the stopper and the side face of the protrusion amount regulating member to slide together. It is characterized by being regulated by

[0006]

[Action]

 When the injection needle provided on the tip of the inner tube is projected from the tip of the outer tube by operating the operating part, the side surface of the stopper integrally provided on the outer peripheral surface of the injection needle is provided on the tip of the outer tube. Sliding on the side surface of the protruding amount control member, the protruding amount of the injection needle is made constant.

[0007]

【Example】

 Hereinafter, the present invention will be described with reference to the illustrated embodiments. FIG. 3 shows the overall configuration of an endoscope injector to which the present invention is applied. As is well known, the endoscope injector 1 is for inserting a medical fluid or the like into an affected area by inserting it into a body cavity via a forceps channel of an endoscope, and has an injection needle at its tip. A flexible outer tube 2 made of a close-wound coil having a protruding amount restricting member 8 for guiding the protruding amount and restricting the protruding amount and having an operation part main body 5 fixed to the rear end thereof. A needle 6 for injection (see FIG. 1) is attached to the tip of the outer tube 2 so as to be able to move back and forth, and a slider 6 that constitutes an operation section together with the operation section body 5 is attached to the rear end. The inner tube 4 made of a flexible tube to which is fixed, and a short tubular stopper 11 (see FIG. 1) integrally attached to the middle outer peripheral surface of the injection needle 3 are the main parts. Is configured.

The slider 6 is inserted into the operation portion main body 5 so as to be movable back and forth to form an operation portion, and when the slider 6 is inserted into the operation portion main body 5, the slider 6 is inserted through the inner tube 4. The injection needle 3 is adapted to protrude from the protrusion amount restricting member 8. Further, the injection needle 3 and the stopper 11 form a puncture portion. Reference numeral 7 is a fold preventing member for reinforcing the connecting portion between the outer tube 2 and the operation portion main body 5.

FIG. 1 and FIG. 2 are cross-sectional views of the distal end portion of an endoscope injector 1 showing a first embodiment of the present invention, in which the distal end portion of a mantle tube 2 from which the injection needle 3 is projected. The projection amount restricting member 8 for guiding the projection of the injection needle 3 and for restricting the projection amount of the needle is fitted and fixed to this. A guide hole 9 for guiding the protrusion of the injection needle 3 is formed in the tip of the protrusion amount restricting member 8, and the rear side of the guide hole 9 has an inner diameter. A single cone-shaped inner side surface 10 that increases toward the rear end portion is formed, and the rear end inner side portion that is continuous with this inner side surface 10 is a mounting hole portion for the outer tube 2.

Then, on the inner side surface 10, a side surface portion 12 formed on the outer peripheral surface of the distal end portion of a short tubular stopper 11 fixed to the distal end portion of the inner tube 4 together with the base portion of the injection needle 3. The contact of the needles with each other restricts the amount of protrusion of the injection needle 3 from the outer tube 2.

If the opening angle of the inner side surface 10 is 45 degrees or less on one side with respect to the protruding direction of the injection needle 3, the needle tip 3 a of the needle 3 will not easily slip on the inner side surface 10. In this case, the taper angle of the inner side surface 10 is 35 degrees or less on one side in consideration of the case where the needle tip 3a is bent and protrudes by about 10 degrees due to the bending of the inner tube 4 and the like. That is, the fully open angle α is set to 70 degrees or less with respect to the protruding direction of the needle. The taper angle of the side surface portion 12 formed on the outer peripheral surface of the tip of the stopper 11 is also the same as the angle of the inner side surface 10.

In the endoscope injector 1 according to the present embodiment configured as described above, the slider 6 is pushed and pulled with respect to the operation portion main body 5, so that the injection needle 3 is attached to the distal end of the outer tube 2. It moves in and out from the protrusion amount regulation member 8. When the slider 6 is moved forward to project the injection needle 3 from the guide hole 9 of the projection amount regulating member 8 of the outer tube 2, the inner side surface 10 of the projection amount regulating member 8 is opened as described above. Since the angle is 70 degrees or less, even if the injection needle 3 may be bent to some extent due to the bending of the inner tube 4, it is suitably guided by the inner side surface 10 and the guide hole 9 without any resistance. Can be made to project from the projection amount regulating member 8. The amount of protrusion of the injection needle 3 is regulated to a certain amount by the side surface portion 12 of the stopper 11 slidingly contacting and contacting the inner side surface 10 of the protrusion amount regulating member 8. As described above, according to the above-described embodiment, when the injection needle is projected from the tip of the outer tube, there is no inconvenience that the needle is caught in the projection amount restricting member 8 and cannot be projected, and the side surface portion 12 of the stopper 11 is provided. After sliding on the inner surface 10 of the protrusion amount regulating member 8, the stopper 11 stops at a position near the tip of the protrusion amount regulating member 8 as shown in FIG. The amount is always a fixed amount, and since the taper surfaces of the side surface portion 12 of the stopper 11 and the inner side surface 10 of the protrusion amount regulating member 8 come into contact with each other and stop, the needle does not wobble during puncture.

FIG. 4 is an enlarged cross-sectional view of the main part of the distal end portion of the endoscope injector according to the second embodiment of the present invention. The endoscope injector 21 according to the present embodiment is configured in exactly the same manner as the endoscope injector 1 according to the first embodiment described above, except for the protrusion amount restricting member 22. Therefore, the same reference numerals are given to the same constituent members, and the description thereof will be omitted.

The projection amount regulating member 22 in the endoscope injector 21 of the present embodiment is also formed in the same shape as the tip member 8 in the first embodiment, as shown in FIGS. The inner surface has the same inner side surface 23 as the inner side surface 10 of the tip member 8, but a plurality of inner side surfaces 23 (eight in this embodiment) are arranged at equal intervals in the axial direction. 6 are provided, and a taper groove 25 is provided between the ridges 24.

As described above, in the second embodiment, since the protrusion 24 and the taper groove 25 are provided on the inner side surface 23 of the protrusion amount regulation member 22, the injection needle 3 is projected from the protrusion amount regulation member 22. In doing so, the needle tip 3a is guided by the taper groove 25 formed by the inner side surface 23 and the protrusion 24, and is surely guided toward the guide hole 26 at the tip thereof. The stopper 11 fixed to the position near the base of the injection needle 3 has the side surface 12 formed on the outer peripheral surface of the distal end thereof when the injection needle 3 projects from the projection amount regulating member 22. The protrusion amount of the amount regulating member 22 is regulated to a constant amount by coming into contact with the taper surface of the upper surface of the protrusion 24 and slidingly stopping. Other functions are the same as those of the endoscope injector 1 in the first embodiment.

According to the second embodiment, the injection needle 3 is guided by the tapered groove 25 formed by the protrusion 24 and the inner surface 23, so that the injection needle 3 does not bend laterally. The remarkable effect of being guided toward the guide hole 26 in a straight line is also obtained.

[0017]

[Effect of the device]

 As described above, according to the present invention, when the injection needle is projected from the distal end of the mantle tube, the protruding length of the needle can be kept constant, and the wobbling of the needle can be prevented during puncture. ..

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a distal end portion of an endoscope injector according to a first embodiment of the present invention with an injection needle protruding.

FIG. 2 is an enlarged cross-sectional view of the distal end portion showing the initial state of the injection needle of the endoscope injector shown in FIG.

FIG. 3 is a perspective view showing the overall configuration of an endoscope injector to which the present invention is applied.

FIG. 4 is an enlarged cross-sectional view of the distal end portion of the endoscope injector according to the second embodiment of the present invention in a state where the injection needle is projected.

FIG. 5 is an enlarged cross-sectional view of a protrusion amount restricting member of the endoscope injector of FIG.

6 is an enlarged sectional view taken along the line AA in FIG.

[Explanation of symbols]

 1,21 …………………………………… Injector for endoscope 2 ………………………………………… Mantle tube 3 …………………………………… ………… Injection needle 4 ………………………………………… Inner tube 8,22 ……………………………… Projection amount control member 10,23 …… ……………………… Inside surface 11 …………………………………… Stopper 12 …………………………………… Side surface

Claims (1)

[Scope of utility model registration request] 1. A syringe for an endoscope in which an operating portion and a puncture portion are connected via a double tube consisting of an inner and outer sheath tubes, wherein an ejection amount of an injection needle provided at a tip of the inner sheath tube is increased. A protrusion amount regulating member for making the amount constant is provided at the tip of the outer tube, and the movement amount of the injection needle is regulated by sliding the side surface of the stopper and the side surface of the protrusion amount regulating member. A syringe for endoscopes.