JP3548300B2 - 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, a syringe for an endoscope has a flexible injection tube with an injection needle attached to a distal end thereof, which is inserted into a sheath tube which can be inserted into and removed from a treatment instrument insertion passage of the endoscope so as to be able to advance and retreat. By moving the injection tube forward and backward on the side, the injection needle at the distal end is inserted and removed from the distal end of the mantle tube.
[0003]
However, if the injection tube can be inserted into and removed from the mantle tube without resistance, for example, the injection tube may fall off from the hand side of the mantle tube during preparation for injection, or conversely, the tip of the mantle tube The injection needle may pop out from the
[0004]
Therefore, the injection tube can be fixed to the outer tube at two positions, that is, the position where the injection needle is accommodated in the distal end of the outer tube and the position where the injection needle protrudes from the distal end of the outer tube. 63-34699).
[0005]
[Problems to be solved by the invention]
When the distal end of the injection tool is positioned within the distal end of the insertion section of the endoscope with the injection needle being contained within the distal end of the mantle tube, the stiff and rigid injection needle is just inserted into the endoscope. It will be located in the curved part. Then, since the bending operation of the endoscope is hindered, it is necessary to pull the entire injection tool back closer to the hand than the bending portion during the bending operation.
[0006]
Therefore, in the case where the injection is repeatedly performed while changing the position of the affected part little by little, the entire injection device must be largely advanced and retracted with respect to the endoscope each time, and the outer sheath for the endoscope is required. Both operations of inserting / removing the tube and inserting / removing the injection tube into / from the mantle tube are performed each time, and the operation is very complicated.
[0007]
Accordingly, the present invention provides an endoscope injection device that can stably maintain the position of the liquid injection tube in the mantle tube, and that can easily and smoothly perform operations during repeated injections and the like. The purpose is to provide.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the endoscope injection device of the present invention is configured such that a flexible liquid injection tube having an injection needle provided at a distal end thereof can be inserted into and removed from a treatment tool insertion passage of the endoscope. In the endoscope injection tool which is inserted into the mantle tube so as to be able to advance and retreat, the injection tube is free in the axial direction with respect to the mantle tube by applying frictional resistance to the movement of the solution tube with respect to the mantle tube. A frictional resistance adding means for restricting the movement of the frictional member.
[0009]
The frictional resistance adding means may be configured by pressing a member of a base portion attached to a proximal side of the outer tube against the outer peripheral surface of the liquid injection tube.
Further, tube fixing means for fixing the injection tube at a predetermined position with respect to the mantle tube may be added.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows an injection tool 10 for an endoscope 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 the endoscope is thinned. A liquid injection tube 12 made of a flexible tube is inserted so as to be able to advance and retreat.
[0011]
The outer tube 11 is formed of, for example, PTFE (polytetrafluoroethylene resin), and the liquid injection tube 12 is formed of, for example, polyimide resin or PTFE. However, other types of synthetic resin may be used.
[0012]
The distal end of the injection tube 12 is cut obliquely so as to be able to pierce the inner wall of a human body cavity, and the injection needle portion 13 is formed. However, a metal or non-metal injection needle may be connected to the tip of the injection tube 12.
[0013]
A liquid inlet 14 for feeding liquid into the injection tube 12 is fixedly connected to the proximal end of the injection tube 12 on the proximal side. The liquid inlet 14 has a tapered hole 14a to which a syringe can be connected. The liquid inlet 14 may be formed integrally with the liquid injection tube 12.
[0014]
A mantle tube inlet base 15 is attached to the proximal end of the mantle tube 11 so that the liquid injection base 14 can be disengaged. The mantle tube inlet mouthpiece 15 is formed with a tapered hole 15a for inserting and engaging and fixing half of the liquid inlet mouthpiece 14.
[0015]
The mantle tube inlet cap 15 and the mantle tube 11 are connected via a metal or hard nonmetallic connection pipe 16 such as a stainless steel pipe. Therefore, the liquid injection tube 12 inserted into the mantle tube inlet mouthpiece 15 is inserted into the mantle tube 11 through the connection pipe 16.
[0016]
The connection pipe 16 has a frictional resistance applying portion 19 formed at an intermediate portion, which is crushed inward so as to add frictional resistance to the liquid injection tube 12 inserted into the outer tube 11.
[0017]
FIG. 2 shows an enlarged cross section of this portion. In the frictional resistance adding portion 19, the connecting pipe 16 is crushed so as to be slightly flat. However, as shown in FIG. 3, the frictional resistance adding portion 19 may be formed by crushing the connecting pipe 16 into a heart-shaped cross-sectional shape or another shape.
[0018]
The liquid injection tube 12 passing through the frictional resistance applying portion 19 formed by partially crushing the connection pipe 16 is crushed and deformed by the connection pipe 16 in the portion 19 in the radial direction by a very small amount. . In other parts, the liquid injection tube 12 is loosely inserted into the connection pipe 16.
[0019]
As a result, in the frictional resistance adding section 19, frictional resistance is added from the connection pipe 16 to the outer peripheral surface of the injection tube 12, and in the outer tube 11, the injection tube 12 is moved in the axial direction by its own weight or a small external force. It is in a state where it does not move forward and backward only by applying a certain amount of operating force.
[0020]
As shown in FIG. 4, the injection device 10 thus formed is used by being inserted into the treatment tool insertion passage of the endoscope 1, and the liquid inlet 14 is locked to the outer tube inlet base 15. In the state, the injection needle 13 protrudes from the distal end of the mantle tube 11. Reference numeral 2 denotes a bending portion formed at the distal end of the endoscope insertion portion 4 so as to be freely bendable by remote control from the operation portion 3 of the endoscope 1.
[0021]
In the case where the injection is repeatedly performed while changing the position of the affected part little by little, the outer tube 11 is kept in the state shown in FIG. Only the injection tube 12 is pulled out until it comes to a position closer to the hand than the part 2.
[0022]
In this state, the bending portion 2 can be easily bent without any problem. During this time, the liquid injection tube 12 is freely moved in the outer tube 11 by the frictional resistance added by the frictional resistance adding portion 19. Do not move.
[0023]
Then, when the bending operation of the endoscope 1 is completed, the injection tube 12 is pushed into the mantle tube 11 so that the injection needle portion 13 is protruded from the end of the mantle tube 11 to perform injection into the affected part.
[0024]
FIG. 5 shows a second embodiment of the endoscope injection device of the present invention, in which the injection tube 12 is fixed to the outer tube 11 with respect to the outer tube inlet base 15. A knob 17 to be engaged is added, and the knob 17 is fixed to the liquid injection tube 12 at a position away from the liquid inlet 14.
[0025]
As a result, as shown in FIG. 6, the operation parts (15, 17) for moving the injection tube 12 back and forth in the mantle tube 11 and the part (14) for connecting the syringe to the injection tube 12 This makes it easier for an assistant or the like to connect the syringe to the liquid inlet 14 and inject the liquid medicine into the liquid injection tube 12. Other configurations are the same as those of the first embodiment.
[0026]
FIG. 7 shows a frictional resistance adding portion 19 of a third embodiment of the endoscope injection device of the present invention. In this embodiment, the connection pipe 16 is not simply crushed in the radial direction, but is circular. The injection tube 12 is deformed into an arc shape so that the injection tube 12 cannot pass through it linearly. Even with this configuration, friction resistance can be added to the liquid injection tube 12 as in the first embodiment.
[0027]
FIG. 8 shows the frictional resistance adding portion 19 of the fourth embodiment of the endoscope injection device of the present invention, and the illustration of the outer tube 11 is omitted. Here, the inside diameter of the middle portion of the connection pipe 16 is formed slightly smaller than the outside diameter of the liquid injection tube 12, and a slit 16a parallel to the axis is formed in the connection pipe 16 in that portion. The slit 16a is also formed on the back side.
[0028]
With this configuration, both sides of the connection pipe 16 cut by the slits 16a become the frictional resistance adding portions 19, and the liquid injection tube 12 is always loosely tightened by the elasticity of the portions. The operation is the same as in the first embodiment.
[0029]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, since the movement of the injection tube with respect to the mantle tube is regulated by frictional resistance, the position can be stabilized without the injection tube moving freely in the mantle tube. Moreover, in the case of repeated injections, there is no need 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 a certain amount of the injection tube, stop it, and then push it in again, The insertion / removal operation is simple, and the injection can be performed smoothly into the body cavity.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an injection device for an endoscope according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of a frictional resistance adding section 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 section according to the first embodiment of the present invention.
FIG. 4 is a side view of the use state of the first embodiment of the present invention.
FIG. 5 is a partial longitudinal sectional view of an endoscope injection tool according to a second embodiment of the present invention.
FIG. 6 is a side view of a use state according to the second embodiment of the present invention.
FIG. 7 is a partial longitudinal 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 injector according to a fourth embodiment of the present invention.
[Explanation of symbols]
11 Mantle tube 12 Injection tube 16 Connection pipe 19 Friction resistance addition section

Claims (2)

An injection tube for an endoscope in which a liquid injection tube formed of a flexible tube provided with an injection needle at a distal end is inserted into a treatment tube insertion passage of the endoscope so as to be able to advance and retreat into a detachable outer tube.
A part of the hard pipe-shaped member attached near the proximal end of the mantle tube is partially crushed inward so that the part is pressed against the outer peripheral surface of the injection tube, and the injection tube is used at that portion. the added pair Shi friction resistance to the movement of the pouring tube against the outer tube by deforming the state of crushed radially pouring tube to move freely in the axial direction relative to the outer tube An injection tool for an endoscope, comprising a frictional resistance adding means for regulating the frictional force. Endoscopic injection device according to claim 1, wherein the tube fixing means for fixing in position are added to the mantle tube the liquid injection tube.

Images