JPH0938202A - Endoscopic injection instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an endoscopic injection instrument which can be punctured from near front direction to an affected site by easy operation and has durability and reduced cost. SOLUTION: A curving disposition is formed around a head of a fluid feeding tube 11 which has flexibility and elasticity, can be freely inserted/detached directly into a treatment inserting channel 2, and is composed of one tube made of a synthetic resin, and also the head of the fluid feeding tube 11 is formed into an injection needle part 12 which has a shape capable of puncture and feeding fluid, and a fluid injecting opening 13 for feeding fluid to the fluid feeding tube 11 is provided on the base end of the fluid feeding tube 11.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art In general, a syringe for an endoscope is connected with a straight injection needle made of a metal pipe at a distal end of a liquid feeding tube, and is injected from a distal end of an outer tube that can be inserted into and removed from a treatment instrument insertion channel. It is configured so that the needle can be protruded and retracted.

However, in order to perform an injection into an affected part in a body cavity, it is often the case that the needle tip slips and the puncture cannot be successfully performed unless the puncture is performed from the frontal direction which is as perpendicular as possible to the mucosal surface.

[0004] Therefore, conventionally, an operation wire connected to the distal end portion of the mantle tube is pulled from the hand side, whereby
There are ones in which the tip portion can be bent (JP-A-5-57021, JP-A-5-253179).
issue).

[0005]

However, in order to bend the distal end portion of an extremely thin endoscope injection tool by a pulling operation of the operation wire in a short distance, it is necessary to pull the ultrafine operation wire with a strong force. Does not occur, the tip mechanism is easily damaged. In addition, on the hand side, both the injection operation and the tip bending operation, which require very delicate operations, have to be performed, so the operations are complicated and it is difficult to perform accurate operations.

Accordingly, an object of the present invention is to provide a durable and low-cost endoscope injector which can puncture the affected part from a direction close to the front by a simple operation. I do.

[0007]

In order to achieve the above-mentioned object, an endoscope injection instrument of the present invention is used by inserting it into a treatment instrument insertion channel of an endoscope. In the above, in addition to forming a bend near the tip of a liquid feed tube made of a synthetic resin tube that is flexible and elastic and can be directly inserted into and removed from the treatment instrument insertion channel, the liquid feed tube Is formed into an injection needle portion having a shape capable of puncturing and liquid feeding, and a liquid inlet for feeding a liquid into the liquid feeding tube is provided at the base end of the liquid feeding tube, The hardness of the liquid supply tube may be greater than the hardness of the treatment instrument insertion channel.

Further, the endoscope injection tool of the present invention is an endoscope injection tool which is used by being inserted into a treatment tool insertion channel of an endoscope, and can be inserted into and removed from the treatment tool insertion channel. In addition to forming a bend near the tip of a liquid feed tube made of a synthetic resin tube that is flexible and elastic so that it can be advanced and retracted inside a simple outer tube, the tip of the liquid feed tube is punctured and fed. The injection needle portion having a shape capable of liquid is formed, and a liquid inlet for feeding the liquid into the liquid supply tube is provided at the proximal end of the liquid supply tube, and the hardness of the liquid supply tube is The hardness may be higher than the hardness of the outer tube.

[0009]

Embodiments will be described with reference to the drawings. FIG. 1 shows an endoscope injection tool 10 according to a first embodiment of the present invention. As shown in FIG. 3, this injection tool 10 has a treatment tool insertion channel 2 of an endoscope 1. It is used by inserting it inside.

The injection instrument 10 is formed by a liquid delivery tube 11 which is a single synthetic resin tube which is flexible and elastic over its entire length and which can be directly inserted into and removed from the treatment instrument insertion channel 2. There is.

As the material, for example, polyimide resin, polyethylene tetrafluoride ethylene resin (PTFE) or the like can be used. However, other types of synthetic resins may be used. The hardness will be described later.

The tip of the liquid feeding tube 11 is obliquely cut so that it can be pierced into the inner wall of a human body cavity,
The injection needle portion 12 is formed. A smooth curved bend is formed at the tip of the liquid supply tube 11. Since the injection needle portion 12 is a part of the liquid feeding tube 11 itself made of synthetic resin, it can be bent freely.

The curved portion may be formed so as to include the tip portion of the injection needle portion 12 as shown in FIG. 1, or may not be formed so as not to include the tip portion of the injection needle portion 12.
It may be formed rearward from the vicinity of the tip portion.

Further, the relationship between the direction of the slope of the needle tip of the injection needle portion 12 and the curving direction may be set in any manner according to the purpose of use, and as shown in FIG. 1
The direction may be opposite to that illustrated in FIG.

At the base end of the liquid feeding tube 11, a liquid injection port portion 13 for feeding the liquid into the liquid feeding tube 11 is provided.
It is formed integrally with the liquid feeding tube 11.
However, the liquid inlet port 13 may be formed as a separate component from the liquid feeding tube 11 and connected to the base end of the liquid feeding tube 11.

The injection device 10 thus formed is shown in FIG.
As shown in FIG. 1, the treatment instrument insertion channel 2 of the endoscope 1
And the injection needle portion 12 is projected from the tip of the insertion portion of the endoscope 1 to puncture the inner wall of the body cavity, and the medicinal solution delivered from the syringe 14 connected to the liquid injection port portion 13 on the proximal side is delivered. The liquid tube 11 is injected into the affected part 100 through the injection needle part 12.

In this case, since the distal end portion of the liquid feeding tube 11 is provided with a curved line, the injection needle portion 12
It is possible to make the direction of the distal end of the liquid crystal tube closer to the vertical direction with respect to the inner wall of the body cavity as compared with the protruding direction of the liquid feeding tube 11 from the distal end of the insertion portion of the endoscope 1. As a result, the injection device 10
The injection needle portion 12 can be easily punctured into the targeted affected area 100 without performing any remote operation for bending the distal end portion of the.

Further, since the injection device 10 has no outer tube,
The outer diameter of the injection device 10 can be reduced, and the diameter of the conduit through which the drug solution passes can be made sufficiently large. Therefore, it is possible to inject a sufficient drug solution through the endoscope having a thin insertion portion.

Reference numeral 3 shown in FIG. 3 denotes a bending portion (bending portion of the endoscope) formed at the distal end portion of the insertion portion so as to be bendable by remote control from the endoscope operating portion 4. Three
When it is fully bent, the treatment instrument insertion channel 2 therein is also bent with a small radius of curvature, and there is a problem as to whether the injection needle portion 12 of the injection instrument 10 can pass therethrough without hindrance.

Considering this point, first, as shown in FIG. 4, the injection needle portion 12 passes in a state in which the needle tip of the injection needle portion 12 is bent so as to be positioned on the inner peripheral side of the bend of the liquid feeding tube 11. When doing, there is no risk that the needle tip will pierce the treatment instrument insertion channel 2.

Since the liquid feeding tube 11 is flexible up to the most distal injection needle portion 12, it smoothly passes along the bend of the treatment instrument insertion channel 2 and passes therethrough, and the injection needle portion 12 is The treatment tool insertion channel 2 is projected from the tip.

If the liquid is safely passed through the treatment instrument insertion channel 2 bent with such a small radius of curvature, the liquid feeding tube 11 has elasticity so that it returns to the original straight state. It is possible to puncture the inner wall of the body cavity.

As shown in FIG. 5, when the needle tip of the injection needle portion 12 is located on the outer peripheral side of the bend of the liquid feeding tube 11, the injection needle portion 12 may stick into the treatment instrument insertion channel 2 depending on conditions. There is a possibility that it will end up.

Generally, the material of the treatment instrument insertion channel 2 is low density polyethylene (hardness: Shore D41 to
50), high density polyethylene (hardness: Shore D60 ~
70), tetrafluoroethylene (PFA) (hardness: Shore D60 to 64), polytetrafluoroethylene (PTF
E) (hardness: Shore D50 to 56) and the like are used.

On the other hand, the liquid delivery tube 1 of the injection device 10
If a hardness of 1 is selected as a synthetic resin having a hardness equal to or lower than the hardness of the treatment instrument insertion channel 2, the injection needle portion 12 does not pierce the treatment instrument insertion channel 2.

However, the liquid feed tube 11 does not necessarily have to be a material having a hardness lower than that of the treatment instrument insertion channel 2. As a result of the experiment, for example, polyethylene tetrafluoride ethylene (PTFE) having a hardness of Shore D75, a polyimide of Rockwell R129 having an apparently high hardness, etc. could be used without any problem.

FIG. 6 shows the experimental conditions, and is tetrafluoroethylene (PFA) (hardness: Shore D60 to 64).
Bending the treatment tool insertion channel 2 manufactured by the manufacturer with a radius of curvature corresponding to the bending state of the bending portion of various endoscopes, and inserting the polyimide injection tool 10 of Rockwell R129 therethrough,
It was judged whether or not the vehicle could pass without hindrance. In all cases, the injection needle portion 12 of the injection device 10 was positioned on the outer peripheral side of the bend.

In FIG. 7, the inner and outer diameters (diameter) are 2.2 mm /
The experimental result when the injection tool 10 having an inner / outer diameter (diameter) of 0.7 mm / 1.25 mm is passed through the treatment tool insertion channel 2 of 2.8 mm is shown.
Passed through the treatment instrument insertion channel 2 without any trouble.

In FIG. 8, the inner and outer diameters (diameter) are 1.2 mm /
The experimental results when the injection device 10 having an inner and outer diameter (diameter) of 0.7 mm / 1.0 mm is passed through the treatment device insertion channel 2 of 1.7 mm are shown. In this case as well, injection is performed in all cases. The tool 10 passed through the treatment tool insertion channel 2 without any trouble.

As described above, the liquid feeding tube 11 made of a material harder than the treatment instrument insertion channel 2 is inserted into the treatment instrument insertion channel 2 so that the injection needle portion 12 is on the outer peripheral side of the bend. It is considered that the reason why the treatment instrument insertion channel 2 is not pierced is due to the difference in rigidity between the treatment instrument insertion channel 2 and the liquid feeding tube 11 and the sliding friction resistance.

FIG. 9 shows a second embodiment of the present invention, in which a small slope 12b is formed on the tip of the injection needle portion 12 on the opposite side of the original slope 12a. The angles θ1 and θ2 of the slopes 12a and 12b are both 30
°.

When the injection needle portion 12 is formed in such a shape so that the sharpened portion of the injection needle portion 12 is located slightly inside the outer circumference, as shown in FIG. 10, the injection needle portion 12 bends with a small radius of curvature. Since the needle tip does not touch the inner peripheral surface of the treatment instrument insertion channel 2 when passing through the treatment instrument insertion channel 2, the treatment instrument insertion channel 2 is not pierced even if a hard material is used for the liquid feeding tube 11.

FIG. 11 shows a third embodiment of the present invention, in which the thickness of the injection needle portion 12 is gradually reduced as it goes forward. By doing so, the injection needle portion 12 becomes flexible and easily follows the bend of the treatment instrument insertion channel 2, and easily penetrates into the inner wall of the body cavity.

FIG. 12 shows a fourth embodiment of the present invention, in which a cored bar 20 having a rounded tip is passed through the liquid feeding tube 11. The cored bar 20 is also provided with a bent shape similar to that of the liquid delivery tube 11.

As shown in FIG. 12, when the tip of the cored bar 20 is slightly protruded from the injection needle portion 12 of the injection instrument 10 and inserted into the treatment instrument insertion channel 2, the tip of the cored bar 20 is inserted through the treatment instrument. Since it is along the inner peripheral surface of the channel 2, the treatment tool insertion channel 2 is not pierced even if a hard material is used for the liquid feeding tube 11. At the time of puncturing the inner wall of the body cavity, the cored bar 20 is pulled out from the injection device 10 to the proximal side.

FIG. 13 shows a fifth embodiment of the present invention, in which the diameter of the tip portion of the liquid feeding tube 11 is formed thin. If formed in this way, as shown in FIG.
It becomes easier to follow the bend of the body and the puncture depth with respect to the inner wall of the body cavity can be restricted to only the small diameter portion to make the puncture depth almost as desired. The length and thickness of the small-diameter portion may be set as needed.

FIG. 15 shows a sixth embodiment of the present invention, in which a cylindrical protrusion 15 for regulating the puncture depth to the inner wall of the body cavity is provided near the injection needle portion 12 of the liquid feeding tube 11. It is fixed.

FIG. 16 shows a seventh embodiment in which the projection 16 for regulating the puncture depth is formed by heating and deforming the liquid feeding tube 11 itself, and is shown in FIGS. 17 and 18. Thus, the number of protrusions 16 may be two or three or more.

FIG. 19 and FIG. 20 show an eighth embodiment of the present invention, in which the liquid-sending tube 11 having a bent shape near the tip is replaced with a flexible synthetic resin tube. The outer tube 21 is arranged so as to be able to move forward and backward, and the outer tube 21 can be inserted into and removed from the treatment instrument insertion channel 2 of the endoscope.

The tip of the liquid feeding tube 11 is cut off obliquely to form an injection needle portion 12. If the same material as the treatment instrument insertion channel 2 described in the first embodiment is used as the material for the outer tube 21, the injection needle portion 12 causes the outer needle tube 12 to move when the liquid delivery tube 11 is moved back and forth in the outer tube 21. Do not pierce 21.

On the other end side of the inner cylinder 24 connected to the base end of the liquid supply tube 11, a liquid injection mouthpiece 25 to which a syringe or the like can be connected is formed. The inner cylinder 24 is axially advanceable / retreatable and insertable / removable in an outer cylinder 26 connected to the proximal end of the outer tube 21.

The O attached to the inner peripheral side of the outer cylinder 26
The ring 27 engages with one of the click grooves 28 and 29 formed at two locations on the outer peripheral surface of the inner cylinder 24, whereby relative positioning between the inner and outer cylinders 24 and 26 is performed.

FIG. 19 shows a state in which the O-ring 27 is engaged with the first click groove 28 and the injection needle portion 12 is housed in the outer tube 21, and the treatment instrument insertion channel 2 is shown.
Insertion and removal is performed in this state.

FIG. 20 shows a state in which the O-ring 27 is engaged with the second click groove 29 and the injection needle portion 12 projects from the distal end of the outer tube 21 by a predetermined length L. Is injected in this state.

The protrusion length L may be set and selected according to the purpose of use. During use, the liquid feeding tube 11 is inserted into and removed from the outer tube 21, and the outer tube 21 is inserted into the outer tube 21 with the injection needle portion 12.
Delivery tube 1 with different protrusion length L without breaking through
It can also be exchanged for 1.

In the injection instrument 10 thus formed, the outer tube 21 is inserted into the treatment instrument insertion channel 2 of the endoscope 1 and is projected from the distal end of the outer tube 21 as shown in FIG. The injection needle portion 12 is punctured on the inner wall of the body cavity. Then, the drug solution delivered from a syringe (not shown) connected to the liquid injection mouthpiece 25 on the hand side is injected into the affected part 100 through the solution delivery tube 11. The injection needle portion 12 formed at the tip of the liquid feeding tube 11 in this embodiment can also have various shapes shown in FIGS.

FIG. 22 shows a state in which the injection instrument 10 of the present invention is used by being inserted into the treatment instrument insertion channel 2 of the ultrasonic endoscope 50, and the needle tip of the injection instrument 10 is viewed internally. It is possible to perform accurate treatment by bringing it closer to the center of the visual field range A for mirror observation and further reaching the center of the ultrasonic tomographic image observation range B.

Then, if the radius of curvature of the tip of the injection tool 10 is reduced, as shown in FIG. 23, puncture to a closer position can be performed near the center of the ultrasonic tomographic image observation range B. You can

[0049]

According to the present invention, a bend is formed near the tip of a liquid feed tube made of a flexible and elastic synthetic resin tube, and the tip of the liquid feed tube is punctured and liquid fed. By forming in the injection needle part that is capable of
It is possible to puncture the affected area from the direction close to the front with a simple operation without performing remote operation for bending the tube tip, and because it has a simple structure, it is durable and can be constructed at low cost. be able to.

[Brief description of drawings]

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

FIG. 2 is a side surface partial cross-sectional view of a modified example of the distal end portion of the endoscope injection device of the first embodiment of the present invention.

FIG. 3 is a side view of the use state of the first embodiment of the present invention.

FIG. 4 is a side cross-sectional view for explaining the operation of the endoscope injection device of the first embodiment of the present invention.

FIG. 5 is a side sectional view for explaining the operation of the endoscope injection tool of the first embodiment of the present invention.

FIG. 6 is a side cross-sectional view showing a state of an insertion experiment of the endoscope injection tool of the first embodiment of the present invention with respect to the treatment tool insertion channel.

FIG. 7 is a table showing conditions and results of an insertion experiment of a treatment tool insertion channel of the endoscope injection tool according to the first embodiment of the present invention.

FIG. 8 is a table showing conditions and results of an insertion experiment of a treatment tool insertion channel of the endoscope injection tool according to the first embodiment of the present invention.

FIG. 9 is a side partial cross-sectional view of the endoscope injection tool of the second embodiment of the present invention.

FIG. 10 is a side sectional view for explaining the operation of the endoscope injection tool of the second embodiment of the present invention.

FIG. 11 is a side surface partial cross-sectional view of the distal end portion of the endoscope injection device of the third embodiment of the present invention.

FIG. 12 is a side partial cross-sectional view of an endoscope injection device of a fourth embodiment of the present invention.

FIG. 13 is a side surface partial cross-sectional view of the distal end portion of the endoscope injection device of the fifth embodiment of the present invention.

FIG. 14 is a side sectional view for explaining the operation of the endoscopic injection device according to the fifth embodiment of the present invention.

FIG. 15 is a side surface partial cross-sectional view of the distal end portion of the endoscope injection device of the sixth embodiment of the present invention.

FIG. 16 is a side surface partial cross-sectional view of the distal end portion of the endoscope injection device of the seventh embodiment of the present invention.

FIG. 17 is a front cross-sectional view of the distal end portion of the endoscope injection device of the seventh embodiment of the present invention.

FIG. 18 is a front cross-sectional view of a modified example of the distal end portion of the endoscopic injection device according to the seventh embodiment of the present invention.

FIG. 19 is a side sectional view of an endoscope injection tool of an eighth embodiment of the present invention.

FIG. 20 is a side sectional view of an endoscope injection tool of an eighth embodiment of the present invention.

FIG. 21 is a schematic view of the use state of the endoscope injection tool of the eighth embodiment of the present invention.

FIG. 22 is a perspective view showing a state in which the endoscope injection instrument of the present invention is used in an ultrasonic endoscope.

FIG. 23 is a perspective view showing a state in which the endoscope injection tool of the present invention is used in an ultrasonic endoscope.

[Explanation of symbols]

 2 Treatment tool insertion channel 10 Endoscope injection tool 11 Liquid feeding tube 12 Injection needle section 13 Liquid injection port section

Claims (4)

[Claims] 1. An endoscope injection tool used by being inserted into a treatment tool insertion channel of an endoscope, which has flexibility and elasticity and can be directly inserted into and removed from the treatment tool insertion channel. A bend is formed near the tip of a liquid feed tube made of a single synthetic resin tube, and the tip of the liquid feed tube is formed into an injection needle part capable of puncturing and liquid feeding. A syringe for an endoscope, characterized in that a liquid inlet for feeding a liquid into the inside is provided at the proximal end of the liquid feeding tube. 2. The endoscope injection instrument according to claim 1, wherein the liquid supply tube has a hardness higher than that of the treatment instrument insertion channel. 3. An endoscope injection tool which is used by being inserted into a treatment instrument insertion channel of an endoscope, and is flexible so that it can be advanced and retracted in an outer sheath tube which can be inserted into and removed from the treatment instrument insertion channel. It has elasticity and a bend is formed near the tip of a liquid feed tube consisting of a single synthetic resin tube, and the tip of the liquid feed tube is formed into an injection needle part that can puncture and feed liquid. A liquid injection port for feeding a liquid into the liquid feeding tube is provided at the base end of the liquid feeding tube. 4. The endoscope injection device according to claim 3, wherein the hardness of the liquid supply tube is higher than the hardness of the outer tube.