JPH0715551Y2 - Endoscope syringe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is an endoscope that is inserted into a forceps channel of an endoscope and punctured at a target site to inject a drug solution or the like and to suck tissue at a lesion site. For syringes.

[Prior Art] It is known that a syringe is introduced into a body cavity by using a forceps channel of an endoscope to directly inject a drug solution into a trunk of the body cavity or to collect a tissue at a lesion site. ing. Such a syringe is disclosed in Japanese Utility Model Publication No. Sho 57-126201. That is, as shown in FIG. 2, this syringe has an injection needle made up of a liquid feeding tube 11 and a needle member 12 fixed to the distal end thereof, which is inserted into an outer sheath 13 so as to be able to move forward and backward. Then, the tip 14 is fixed to the tip of the outer sheath 13 and the stopper 15 is provided on the outer periphery of the needle member 12 so as to contact the tip 14. This syringe pushes the liquid feeding tube 11 forward from the hand side and urges the stopper 15 to press it against the distal tip 14, whereby the needle member 12 is projected from the distal tip 14 and the needle member 12
It also withstands puncture resistance when puncturing the affected area.

[Problems to be solved by the device]

However, in the above-mentioned conventional technique, since the tip 14 is fixed to the outer sheath 13, the tip 14 is fixed inside the body cavity.
There was a risk of an accident that 14 would fall out.

The present invention has been made in view of such problems,
It is an object of the present invention to provide an endoscope injector which eliminates the risk of the tip being dropped and which can be manufactured at a low cost by a very simple method.

[Means and Actions for Solving Problems]

The present invention is an injection needle including a liquid feeding tube forming a liquid feeding path for injecting a drug solution and a needle member fixed to the distal end of the tube, and an outer sheath for inserting and guiding the needle to advance and retract. In the endoscope injector having, the outer sheath is provided with a small-diameter portion thinned by thermoforming at the distal end thereof, and an outer diameter larger than the inner diameter of the small-diameter portion is provided on the outer periphery of the base end portion of the needle member. The stopper member is provided. Then, by pushing the injection needle against the outer sheath, the stopper member on the outer periphery of the injection needle is brought into contact with the small diameter portion of the outer cis tip, whereby the needle protrudes from the outer sheath. It will be fixed in the state that it did.

〔Example〕

FIG. 1 is a view showing an embodiment of the present invention. The endoscope injector 1 relating to this one-character example is an outer sheath 2 which is a flexible tube formed of a synthetic resin such as tetrafluoroethylene.
And an injection needle 3 which is inserted into the outer sheath 2. The injection needle 3 is composed of a flexible liquid feed tube 4 made of a synthetic resin such as ethylene tetrafluoride forming a liquid feed path and a needle member 5 fixed to the tip of the tube. The rear end of the needle member 5 is covered. An annular stopper 6 is provided on the outer periphery of the needle member 5. The outer sheath 2 is provided at its distal end with a small diameter portion 2a which is reduced in diameter by thermoforming, and the inner diameter of the small diameter portion 2a is smaller than the outer diameter of the stopper 6. An operation portion 7 is fixed to the proximal end side of the outer sheath 2. On the other hand, a slider 9 is fixed to the proximal end side of the liquid feeding tube 4 via a mouthpiece 8 so as to be movable back and forth in the operation portion 7. The operation portion 7 and the slider 9 have tapered portions 7a and 9a formed on their sliding contact surfaces, respectively, and the operation portion 7 and the slider 9 are frictionally integrated at the pushing position of the slider 9. In addition, this slider 9
The stroke of the slider 9 is set so that the needle member 5 can be sufficiently projected from the outer sheath 2 and the stopper 6 can be sufficiently urged to come into contact with the small diameter portion 2a of the outer sheath 2 at the pushing position. And at the rear end of the slider 9,
A connection portion 9a to which a syringe (not shown) is connected is formed.

Next, the operation of this embodiment will be described.

The syringe 1 is inserted into the forceps channel of an endoscope (not shown) while the slider 5 is pulled toward the hand side and the needle 5 is housed in the outer sheath 2. Then, after guiding the tip of the syringe 1 to the vicinity of the affected part, the slider 9 is pushed into the operating part 7. This causes the needle member 5 to protrude from the tip of the outer sheath 2 via the liquid feeding tube 4. The protrusion amount of the needle member 5 is regulated to a predetermined amount by the stopper 6 provided on the outer periphery thereof coming into contact with the inner surface of the small diameter portion 2a formed at the tip of the outer sheath 2. Here, the slider 9 is further pushed in even after the stopper 6 of the needle member 5 abuts on the small diameter portion 2a to elastically bend the liquid feeding tube 4, whereby the needle member 5
The stopper 6 is elastically biased to the small diameter portion 2a. This pushing operation is performed until the taper surface 9a of the slider 9 is sufficiently frictionally fixed to the taper surface 7a of the operation portion 7.

The thus cleaned slot 9 is fixed to the operation portion 7, and then the entire syringe 1 is pushed into the forceps channel of the endoscope to puncture the affected portion with the needle member 5. In this punctured state, a syringe connected to the connecting portion 9a of the slider 9 is used to inject a drug solution or the like, or to collect tissue by suction.

According to the present embodiment as described above, since the tip of the outer sheath 2 is formed into a small diameter by thermoforming to form the abutting portion with which the stopper 6 of the needle member 5 abuts, a tip of a separate member as in the prior art. It is possible to provide a safe syringe that does not require a tip and has no risk of the tip of the tip falling off. Further, since the one corresponding to the tip is made by a very simple method of thermoforming the outer sheath, the syringe can be manufactured at a low cost and easily.

[Effect of device]

According to the present invention, the tip of the outer sheath is thermoformed to reduce the diameter, and the reduced diameter portion is used instead of the tip, so that the reduced diameter portion can be formed at a low cost by a very simple method. A safe syringe with no tip falling off.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of the present invention, and FIG. 2 is a view showing a conventional endoscope injector. 1 …… Injector for endoscope 2 …… Outer sheath 2a …… Small diameter part 3 …… Injection needle 4 …… Liquid feeding tube 5 …… Needle member 6 …… Stopper

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kazuhiro Inoue 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Creator Tsukagoshi Iso 43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Yukio Sato 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Koichi Kawashima 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Inventor Tsutomu Okada 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Yutaka Yanuma 2-43-2 Hatagaya, Shibuya-ku, Tokyo No. Olympus Optical Industry Co., Ltd. (72) Eiichi Fuse 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Gaku Kogyo Co., Ltd. (72) Inventor: Koji Koda 2-43-2 Hatagaya, Shibuya-ku, Tokyo Kenichi Ohashi, Examiner, Olympus Optical Co., Ltd. (56) Reference JP-A-61-176363 (JP, A) ) JP-A-63-164960 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. An injection needle comprising a liquid feeding tube forming a liquid feeding path for injecting a drug solution and a needle member fixed to the tip of the tube, and an outer sheath for inserting and guiding the injection needle in a retractable manner. In the endoscope injector having, a thin portion having a diameter reduced by thermoforming at the distal end of the outer sheath, and an outer diameter larger than the inner diameter of the thin portion at the outer periphery of the proximal end of the needle member. An endoscope injector, comprising: a stopper member.