JP3548296B2 - Endoscope injection tool - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an injection tool for an endoscope for injecting into a body cavity of a patient through a treatment tool insertion passage of the endoscope.
[0002]
[Prior art]
In general, an injection device for an endoscope is configured such that an injection needle is connected to a distal end of a liquid feeding tube that is freely traversed in a mantle tube, and the liquid feeding tube is advanced and retracted at a hand side so that an injection needle portion at the distal end is formed. It can be inserted and removed from the tip of the mantle tube.
[0003]
[Problems to be solved by the invention]
However, as described above, in the case of a double tube structure in which the liquid feeding tube is passed through the mantle tube, the outer diameter becomes large, so that treatment like a bronchial endoscope or other small-diameter endoscope is performed. In the case of an endoscope in which the inside diameter of the tool insertion passage is small, the injection tool cannot be used.
[0004]
Therefore, an object of the present invention is to provide an endoscope injection tool that can be used practically even in an endoscope in which the inside diameter of the treatment tool insertion passage is small.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, an endoscope injection device of the present invention is an endoscope injection device that is used by being inserted into a treatment tool insertion passage of an endoscope, and has flexibility and elasticity. There is a cut-off tip of a liquid sending tube made of a single synthetic resin tube that can be directly inserted into and removed from the treatment instrument insertion passage to form an injection needle portion, and for sending a liquid into the liquid sending tube. A liquid inlet is provided at a base end of the liquid supply tube, and the liquid supply tube is inserted into the treatment instrument insertion passage when the injection needle portion is protruded from the distal end of the treatment instrument insertion passage by a predetermined length. It is characterized in that fixing means for engaging and fixing the side opening portion is provided.
[0006]
In addition, the entrance side mouth of the treatment instrument insertion passage is formed in a tapered hole shape that gradually becomes thinner to the back, and the fixing means is formed in a tapered cylindrical shape that engages with the entrance side mouth of the treatment instrument insertion passage. Is also good.
[0007]
Further, the fixing means may be formed integrally with the liquid inlet, and the fixing means may be attached in the middle of the liquid sending tube.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments will be described with reference to the drawings.
FIG. 1 shows a use state in which the endoscope injection tool 10 of the present invention is inserted into the treatment tool insertion passage 2 of the endoscope 1.
[0009]
The treatment instrument insertion passage 2 has a distal exit opening at the distal end of the insertion section 1a of the endoscope 1, and a proximal entrance opening protruding obliquely upward from the operation section 1b of the endoscope 1. Reference numeral 2a denotes an outlet opening at the distal end of the treatment instrument insertion passage 2, and 2b denotes an inlet base formed at an opening on the base end side. The inner surface of the inlet mouthpiece 2b is formed in a tapered hole shape that becomes gradually thinner toward the back.
[0010]
The distal end outlet opening 2a and the inlet mouthpiece 2b are connected by a treatment instrument insertion channel 2c made of a flexible tube such as polyethylene tetrafluoroethylene resin (PTFE) or the like.
[0011]
The injection device 10 is formed by a liquid feed tube 11 made of a single synthetic resin tube that is flexible and elastic and can be directly inserted into and removed from the treatment device insertion passage 2 over the entire length. As the material, for example, polyimide resin or PTFE can be used. However, other types of synthetic resins may be used.
[0012]
The distal end of the liquid feeding tube 11 is cut obliquely so as to be able to pierce the inner wall of a human body cavity, and the injection needle part 12 is formed. A liquid inlet 13 for feeding liquid into the liquid feeding tube 11 is fixedly connected to the proximal end of the liquid feeding tube 11 on the hand side.
[0013]
The liquid injection port portion 13 is integrally formed with a fixed cylinder 14 having an outer peripheral surface formed in a tapered cylindrical shape that is exactly engaged with the tapered hole of the inlet mouthpiece 2 b of the treatment instrument insertion passage 2. I have.
[0014]
The fixed tube 14 is fixed to the treatment instrument insertion passage 2 by strongly inserting it into the inlet mouthpiece 2b from the outside. At this time, the injection needle portion 12 is moved from the distal end outlet opening 2a of the treatment instrument insertion passage 2 by a predetermined length. It is set so as to protrude by a distance L. The fixed cylinder 14 is detached from the inlet mouthpiece 2b by strongly pulling it outward.
[0015]
The protruding length L of the distal end of the injection needle portion 12 is set to, for example, about 2 to 20 mm. In the case of a treatment for the pancreas, the liver, or the like, there is an example in which it is better to set to about 40 mm. May be selected.
[0016]
The engaging portion of the treatment instrument insertion passage 2 between the fixed cylinder 14 and the inlet mouthpiece 2b is not limited to the above-described structure, and the fixed cylinder 14 is freely engageable with the inlet mouthpiece 2b, and is fixed when engaged. As long as the tube 14 is fixed to the inlet base 2b, any kind of so-called luer lock base may be used.
[0017]
The injection device 10 thus formed is inserted into the treatment tool insertion passage 2 of the endoscope 1 and the fixed needle 14 is engaged with the inlet mouthpiece 2b, whereby the injection needle portion 12 is moved from the distal end outlet opening 2a. It is fixed in a state protruding by a predetermined length L.
[0018]
The distal end of the insertion portion 1a is pressed toward the affected part while observing the affected part with the endoscope 1, whereby the injection needle part 12 of the injection tool 10 is punctured into the affected part. Therefore, a drug solution can be injected from a syringe (not shown) connected to the liquid injection port 13 or a suction biopsy can be performed.
[0019]
In this case, since the injection device 10 does not have a mantle tube, it is necessary to make the outer diameter of the injection device 10 smaller and to make the diameter of the conduit through which the drug solution passes sufficiently larger than that of the conventional endoscope injection device. Can be. Therefore, it is possible to inject a sufficient liquid medicine through the endoscope 1 having a small outer diameter of the insertion portion 1a.
[0020]
When the treatment with the injection tool 10 is completed, the fixed cylinder 14 is removed from the inlet mouthpiece 2b of the treatment tool insertion path 2, the injection tool 10 is extracted from the treatment tool insertion path 2, and the state of the affected part is observed with the endoscope 1. The endoscope 1 out of the body cavity.
[0021]
FIG. 2 shows a second embodiment of the present invention, in which a fixed cylinder 14 detachable from an inlet mouthpiece 2b of a treatment tool insertion passage 2 is separated from a liquid inlet 13 and a liquid feed tube 11 is separated. And the liquid injection port 13 is pulled out from the fixed cylinder 14 toward the user. With this configuration, it becomes easy to perform an operation such as injection of a chemical solution from the liquid injection port 13.
[0022]
Other configurations are the same as those of the above-described first embodiment. If the fixed cylinder 14 is engaged with the inlet mouthpiece 2b of the treatment instrument insertion passage 2, the injection needle portion 12 is moved to the distal end outlet of the treatment instrument insertion passage 2. It is fixed so as to protrude from the opening 2a by a predetermined length L.
[0023]
FIG. 3 shows a third embodiment of the present invention, in which a fixed cylinder 14 is provided with a sliding cylinder 14a having a through hole formed along the outer surface of the liquid sending tube 11 and a sliding cylinder 14a. It is formed separately from a fixing taper cylinder 14b for fixing to the liquid tube 11.
[0024]
As shown in FIG. 4, a tapered surface 14c for engaging with the inlet mouthpiece 2b is formed on the outer peripheral surface on the front side of the sliding cylinder 14a, and a tapered surface 14d in the opposite direction is formed on the outer peripheral surface on the hand side. Formed on the surface.
[0025]
In addition, a slit 14e that extends from the outer peripheral surface to the inner through-hole is formed over the entire length straight in the axial direction. Reference numeral 14f denotes a projection protruding from the proximal end of the sliding cylinder 14a to prevent the fixing tapered cylinder 14b from coming off. The other parts are the same as in the above-described second embodiment.
[0026]
With such a configuration, when the fixing tapered cylinder 14b is moved in the axial direction to make the hand-side tapered surface 14d tightly tightened, the sliding cylinder 14a is elastically deformed in the direction in which the width of the slit 14e is reduced, and the liquid feeding is performed. The fixed tube 14 is pressed against the outer peripheral surface of the tube 11 and is fixed to the liquid feed tube 11.
[0027]
When the fixing taper cylinder 14b is moved in the reverse direction, the sliding cylinder 14a returns to its original natural state due to its own elasticity, and becomes slidable with respect to the liquid feed tube 11.
[0028]
Therefore, in this embodiment, the fixed cylinder 14 can be fixed at an arbitrary position with respect to the liquid feeding tube 11, and the injection needle portion 12 of the injection device 10 projects from the distal end opening 2 a of the treatment device insertion passage 2. The predetermined length L can be freely set according to the purpose of use and the like.
[0029]
【The invention's effect】
According to the present invention, since the tip of the liquid sending tube made of a single synthetic resin tube that can be directly inserted into and removed from the treatment instrument insertion passage of the endoscope is cut off to form the injection needle part, It can be formed into a small diameter and can be used for an endoscope with a thin insertion portion. Further, when the injection needle portion at the distal end is protruded from the distal end of the treatment instrument insertion passage by a predetermined length, it is fed. A fixing means is provided for engaging and fixing the liquid tube to the inlet-side mouth portion of the treatment instrument insertion passage, so that by pressing the endoscope itself against the diseased part, the injection needle part can be accurately moved to a predetermined depth. The affected part can be punctured.
[0030]
If the fixing means is provided in the middle of the liquid feeding tube, the liquid injection port can be pulled out to the user's hand side to easily perform a liquid injection operation or the like.
[Brief description of the drawings]
FIG. 1 is a side view, partly in section, of a first embodiment of the present invention.
FIG. 2 is a side view, partly in section, of a second embodiment of the present invention.
FIG. 3 is a side view, partly in section, of a third embodiment of the present invention.
FIG. 4 is a perspective view of a fixed cylinder according to a third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Endoscope 2 Treatment tool insertion passage 2a Tip outlet opening 2b Inlet base 10 Injection tool 11 Liquid feeding tube 12 Injection needle part 13 Liquid injection port part 14

Claims (3)

An endoscope injection tool used by being inserted into a treatment tool insertion passage of an endoscope,
The injection needle portion is formed by cutting off the tip of a liquid sending tube made of a single synthetic resin tube which is flexible and elastic and can be directly inserted into and removed from the treatment instrument insertion passage. A liquid inlet for feeding liquid into the liquid supply tube is provided at the base end of the liquid supply tube, and the liquid supply tube is connected to the liquid supply tube when the injection needle portion is protruded from the distal end of the treatment instrument insertion passage by a predetermined length. An injection tool for an endoscope , wherein a fixing means for engaging and fixing the inlet side mouth portion of the treatment instrument insertion passage is mounted in the middle of the liquid feeding tube . The entrance side mouth of the treatment instrument insertion passage is formed in a tapered hole shape that gradually narrows to the back, and the fixing means is formed in a tapered cylindrical shape that engages with the entrance side mouth of the treatment instrument insertion passage. Item 2. An injection device for an endoscope according to Item 1. The endoscope injection device according to claim 1 or 2, wherein the fixing means is provided so as to be movable in an axial direction with respect to the liquid feeding tube and to be freely fixed at an arbitrary position.

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