JPH0984874A - Injector for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injector for an endoscope in which the position of a liq. feeding tube can be stably held in a mantle cylinder and the operation of repeated injections etc., is simple and the injection can be smoothly performed. SOLUTION: A frictional resistance applying part 19 which adds a frictional resistance against movement of a liq. injection tube 12 to a mantle cylinder 11 and controls thereby that the liq. injection tube 12 freely moves in the axial line direction to the mantle cylinder 11, is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope injection instrument for injecting into a body cavity of a patient through a treatment instrument insertion passage of an endoscope.

[0002]

2. Description of the Related Art In general, an injection device for an endoscope is capable of advancing and retracting a flexible injection tube having an injection needle attached to the distal end thereof into a sheath tube which can be inserted into and removed from a treatment instrument insertion passage of an endoscope. The injection needle portion at the distal end is inserted into and removed from the distal end of the outer tube by inserting it into the tube and advancing and retracting the injection tube at the hand side.

However, if the liquid injection tube can be freely inserted into and removed from the mantle tube without resistance, for example, the liquid injection tube may fall off from the proximal side of the mantle tube during preparation for injection, or conversely. There is a risk that the injection needle will pop out of the tip of the tube.

Therefore, there are two positions, that is, a position where the injection needle is housed in the tip of the mantle tube and a position where the injection needle projects from the tip of the mantle tube.
The liquid injection tube could be fixed to the outer tube at one position (Jitsuko 63-34699).

[0005]

When the distal end portion of the injection tool is positioned within the distal end of the insertion portion of the endoscope while the injection needle portion is accommodated in the distal end of the mantle tube, the injection is strong and firm. The needle portion will be just inside the bend of the endoscope. As a result, the bending operation of the endoscope is hindered. Therefore, it is necessary to pull back the entire injection device to the proximal side of the bending portion during the bending operation.

Therefore, when repeatedly injecting by changing the position little by little with respect to the affected part, the entire injection device must be advanced and retracted with respect to the endoscope each time. Both the operation of inserting and removing the outer tube from the mirror and the operation of inserting and removing the liquid injection tube from the outer tube are performed each time, and the operation is very complicated.

[0007] Therefore, the present invention is for an endoscope which can stably maintain the position of the liquid injection tube in the mantle tube, and can be operated easily and repeatedly during repeated injections. The purpose is to provide an injection device.

[0008]

In order to achieve the above object, in the endoscope injection tool of the present invention, a flexible liquid injection tube provided with an injection needle at the tip thereof is In an endoscope injection tool that is insertably / removably inserted into a treatment instrument insertion passage and is inserted into and retractable from an outer sheath tube, the liquid injection tube is provided with friction resistance against movement of the liquid injection tube with respect to the outer sheath tube. It is characterized in that a frictional resistance adding means for restricting free movement in the axial direction with respect to the outer tube is provided.

The frictional resistance adding means may be constructed by pressing a member of a mouthpiece part attached to the mouth side of the outer tube to the outer peripheral surface of the liquid injection tube. Further, tube fixing means for fixing the liquid injection tube to the outer tube at a predetermined position may be added.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an endoscope injection tool 10 according to the present invention, in which a sheath tube 11 made of a flexible tube that can be inserted into and removed from a treatment tool insertion channel of an endoscope is used to make a thin flexible tube. A liquid injection tube 12 made of a flexible tube is inserted so as to freely move back and forth.

The outer tube 11 is made of, for example, PTFE (polytetrafluoroethylene resin), and the liquid injection tube 12 is made of, for example, polyimide resin or PTFE.
And the like. However, other types of synthetic resin may be used.

The tip of the liquid injection tube 12 is obliquely cut so that it can be pierced into the inner wall of a human body cavity,
An injection needle portion 13 is formed. However, a metallic or non-metallic injection needle may be connected to the tip of the liquid injection tube 12.

A liquid injection mouthpiece 14 for feeding the liquid into the liquid injection tube 12 is fixedly joined and connected to the proximal end of the liquid injection tube 12 on the proximal side. Liquid injection base 14
A taper hole 14a that can connect a syringe is formed therein. In addition, the liquid injection mouthpiece 14 is connected to the liquid injection tube 12
And may be formed integrally.

A mantle tube inlet mouthpiece 15 is attached to the mouth side portion of the mantle tube 11 so that the liquid injection mouthpiece 14 can be engaged and disengaged. The outer tube inlet cap 15 has a liquid injection cap 14
Hole 1 for inserting and engaging half of the
5a is formed.

The outer tube inlet mouthpiece 15 and the outer tube 11 are connected to each other via a connection pipe 16 made of metal such as stainless steel pipe or made of hard non-metal. Therefore, the liquid injection tube 1 inserted in the outer cap inlet 15
2 passes through the inside of the connecting pipe 16 and is inserted into the outer tube 11.

The connecting pipe 16 is provided with a frictional resistance adding portion 19 crushed inward so as to add frictional resistance to the liquid injection tube 12 inserted in the outer tube 11 at an intermediate portion. There is.

FIG. 2 shows an enlarged cross-section of that portion, and in the frictional resistance adding portion 19, the connection pipe 16 is crushed so as to have a slightly flat shape. However, as shown in FIG. 3, the friction resistance applying portion 19 may be formed by crushing the connecting pipe 16 into a heart-shaped cross-sectional shape or another shape.

The liquid injection tube 12 passing through the frictional resistance adding portion 19 formed by partially crushing the connection pipe 16 is crushed by the connection pipe 16 at the portion 19 in a radial direction by a very small amount. To transform. In other portions, the liquid injection tube 12 is loosely fitted in the connection pipe 16.

As a result, in the frictional resistance adding section 19,
Friction resistance is added to the outer peripheral surface of the liquid injection tube 12 from the connection pipe 16, and the liquid injection tube 12 does not move back and forth in the axial direction in the outer tube 11 due to its own weight or a small external force. It is in the state of moving forward and backward for the first time by adding.

The injection device 10 thus formed is shown in FIG.
As shown in FIG. 2, the liquid injection mouthpiece 14 is used by being inserted into the treatment instrument insertion passage of the endoscope 1 and the outer tube inlet mouthpiece 15 is inserted.
The injection needle portion 13 projects from the tip of the outer tube 11 in the state of being locked with. Reference numeral 2 is a bending portion formed at the tip of the endoscope insertion portion 4 so as to be bendable by remote control from the operation portion 3 of the endoscope 1.

When the position of the affected area is changed little by little and the injection is repeated, the outer tube 11 is kept in the state shown in FIG. Only the liquid injection tube 12 is pulled out until the position 13 is closer to the hand side than the curved portion 2.

In this state, the bending portion 2 can be easily bent without any problem, while the liquid injection tube 12 is in the outer tube 11 due to the frictional resistance added by the frictional resistance adding portion 19. Then I will not move freely.

After the bending operation of the endoscope 1 is completed, the liquid injection tube 12 is pushed into the outer tube 11 so that the injection needle portion 13 is projected from the tip of the outer tube 11 to inject the affected area. To do.

FIG. 5 shows a second embodiment of the endoscope injection tool of the present invention, in which the liquid injection tube 12 is the outer tube 1.
To add the knob 17 to be engaged with the outer tube inlet mouthpiece 15 so as to be fixed to 1, the knob 17
At a position away from the liquid injection mouthpiece 14
It is fixed at 2.

By doing so, as shown in FIG. 6, an operating portion (15, 17) for advancing and retracting the liquid injection tube 12 in the outer tube 11 and a portion for connecting a syringe to the liquid injection tube 12. Since it is separated from (14), it becomes easy for an assistant or the like to connect the syringe to the liquid injection mouthpiece 14 and inject the liquid medicine into the liquid injection tube 12. Other configurations are the same as those in the first embodiment described above.

FIG. 7 shows the frictional resistance adding portion 19 of the third embodiment of the endoscope injection tool of the present invention. In this embodiment, the connection pipe 16 is not simply crushed in the radial direction. In addition, the liquid injection tube 12 is deformed into an arc shape so that the liquid injection tube 12 cannot linearly pass therethrough. Even with such a configuration, the liquid injection tube 1 as in the first embodiment.
Friction resistance can be added to 2.

FIG. 8 shows a frictional resistance adding portion 19 of the fourth embodiment of the endoscope injection tool of the present invention, and the outer tube 11 is not shown. Here, the connection pipe 1
The inner diameter of the middle portion of 6 is made slightly smaller than the outer diameter of the liquid injection tube 12, and the connecting pipe 16 at that portion is provided with a slit 16a parallel to the axis. Slit 16a
Is also formed on the back side.

With this structure, both side portions of the connection pipe 16 divided by the slit 16a become the frictional resistance adding portions 19, and the elasticity of the portions causes the liquid injection tube 12 to be always loosely tightened, It operates similarly to the first embodiment.

[0029]

According to the present invention, the movement of the liquid injection tube with respect to the outer tube is restricted by frictional resistance, so that the liquid injection tube does not move arbitrarily in the outer tube and its position can be stabilized. Moreover, in the case of repeated injections, it is not necessary to repeatedly insert and remove the mantle tube with respect to the treatment instrument insertion passage of the endoscope, and it is sufficient to pull out only an arbitrary amount of the injection tube, hold it, and then push it in again. The insertion / removal operation is easy and the injection can be smoothly performed in the body cavity.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an endoscope injection device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a frictional resistance adding portion according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view of a different example of the frictional resistance adding portion according to the first embodiment of the present invention.

FIG. 4 is a side view of the usage state of the first embodiment of the present invention.

FIG. 5 is a partial vertical cross-sectional view of the endoscope injection tool of the second embodiment of the present invention.

FIG. 6 is a side view of a second embodiment of the present invention in use.

FIG. 7 is a partial vertical cross-sectional view of an endoscope injection device according to a third embodiment of the present invention.

FIG. 8 is a partial perspective view of an endoscope injection device according to a fourth embodiment of the present invention.

[Explanation of reference numerals] 11 jacket tube 12 injection tube 16 connection pipe 19 friction resistance addition part

Claims (3)

[Claims] 1. An endoscope injection in which a flexible injection tube having an injection needle at its tip is inserted into an outer sheath tube which can be inserted into and removed from a treatment instrument insertion passage of the endoscope so as to be able to move forward and backward. In the tool, frictional resistance adding means for adding frictional resistance to movement of the liquid injection tube with respect to the outer jacket tube to restrict free movement of the liquid injection tube in the axial direction with respect to the outer shell tube is provided. An endoscope injection tool characterized by the above. 2. The internal view according to claim 1, wherein the frictional resistance adding means is constituted by pressing a member of a mouthpiece portion attached to a mouth side of the mantle tube to a peripheral surface of the liquid injection tube. Mirror injection device. 3. The injection device for an endoscope according to claim 1, further comprising a tube fixing means for fixing the liquid injection tube to the outer tube at a predetermined position.