JPH11318820A - Catheter for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a catheter to reduce the burdens of a patient and a doctor, to increase tissue collecting quantity of one time and to shorten an operation time by forming a treating tool housing part capable of simultaneously housing a guide wire and a treating tool and forming a tip part in a thin diameter part in an inserting part and making it possible to selectively lead out one of the guide wire and the treating tool to the outside. SOLUTION: A thin diameter part 4 is formed by narrowing the outer diameter dimension of the tip part of an insertion part 2 and a treating tool housing part 7 capable of simultaneously housing a guide wire 5 and a treating tool such as a biopsy forceps 6 is formed at a part on the rear side from the part 4. The wire 5 and the forceps 6 are housed in parallel without resistance to each other and in the state of being movable forward and backward. Further, an interval between the part 7 and the part 4 is made to a tapered part 8 gradually reducing its diameter. A tapered part 9 is formed also at the tip part of the part 4. By this constitution, the work of replacing the treating tool becomes easy, the burdens of a patient and a doctor is reduced and the sampling quantity of one time is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope catheter which is inserted into a patient's body through a treatment tool insertion channel of an endoscope and is used for, for example, diagnosis and treatment of a pancreaticobiliary duct.

[0002]

2. Description of the Related Art Generally, a plurality of treatment tools such as an endoscope catheter and biopsy forceps which are inserted into a patient's body through a treatment tool insertion channel of an endoscope at the time of diagnosis and treatment of a pancreatic bile duct are used. You. Then, operations such as sending and discharging a liquid such as a contrast medium into and from a patient through an endoscope catheter, and collecting biological tissue in the body using biopsy forceps are performed.

[0003] When using the above-mentioned treatment tool, an endoscope is inserted into the body of a patient, for example, the duodenum in advance. Then, a plurality of treatment tools such as an endoscope catheter and biopsy forceps are inserted into the patient through the treatment tool insertion channel of the endoscope.

Further, when using a treatment tool such as an endoscope catheter or a biopsy forceps, a guide wire for guiding the insertion operation of the treatment tool is used. Here, when using the catheter for an endoscope, a guide wire is inserted into the body through a treatment tool insertion channel of the endoscope in advance, and a distal end portion of the guide wire is guided to a target site in the body. Insert the end into the endoscope catheter.

Subsequently, the catheter is pushed into the body along the guide wire. At this time, the catheter is guided to a target site in the body while being guided by the guide wire. An operation such as injection of a contrast agent is performed through the catheter.

In addition, when using the biopsy forceps after using the catheter, the operation of inserting the biopsy forceps into the body through the treatment instrument insertion channel of the endoscope is performed after the catheter is pulled out of the body. .

Further, as a catheter used when a contrast medium is fed into a patient's body, for example, Japanese Patent Application Laid-Open No. 6-2772.
A configuration disclosed in Japanese Patent Publication No. 94 is known.
This is to form a three-stage tube in which the tube diameter of the synthetic resin tube is changed in three stages, and the smallest diameter small portion at the distal end side and the largest diameter large diameter portion at the base end side. By arranging the diameter portions, inserting a metal wire into the inside of the tube, and pushing and pulling the metal wire, the flexibility and elasticity of the small diameter portion can be adjusted.

Further, Japanese Patent Application Laid-Open No. Hei 5-184535 discloses that a plurality of built-in treatment tools are inserted into a single catheter in a state where they can be used independently of each other. A multi-function treatment tool configured to selectively use one of them is shown.

FIG. 10 shows a guidewire-compatible biopsy forceps a used in a conventional pancreaticobiliary tissue biopsy. In this biopsy forceps a, for example, a guide wire insertion hole d is formed in one of openable and closable tissue collecting cups b and c for collecting a biological tissue. By inserting the guide wire e into the guide wire insertion hole d, the biopsy forceps a can be guided to a target site in the body while being guided by the guide wire e.

Further, FIG. 11 shows a conventional guidewire-compatible biopsy forceps a having a configuration in which a guidewire channel g through which a guidewire e is inserted is inserted in an elongated tube sheath f of the biopsy forceps a. I have.

[0011]

Problems to be Solved by the Invention
In the catheter disclosed in Japanese Patent Application Publication No. 4 (1999) -1995, the metal wire inserted into the tube is used for adjusting the flexibility and elasticity of the tube, and therefore has a different function from the guide wire for guiding the insertion of the catheter. Therefore, in the configuration of this publication, there is a problem that the catheter cannot be guided to a target site in the body by the guide wire.

Further, after injecting a contrast medium by using a catheter, if a biopsy forceps is used, the catheter is pulled out of the body, and then the biopsy forceps are inserted into the body through a treatment tool insertion channel of an endoscope. Since it is necessary to perform the replacement work of the treatment tools, it takes time to replace the treatment tools, and there is a problem that the burden on both the patient and the doctor increases.

Further, in the catheter having the structure disclosed in Japanese Patent Application Laid-Open No. 5-184535, since a plurality of built-in treatment tools are inserted into one catheter so that they can be used independently, the outer diameter of the catheter becomes large. There's a problem. This makes it difficult to insert the catheter into the body of the patient, which causes a problem that the burden on both the patient and the doctor increases. In the configuration of this publication, since a plurality of built-in treatment tools in the catheter can be freely operated, it is necessary to secure a necessary and sufficient space so as not to interfere with each other, and extremely small size cannot be expected.

In the conventional guidewire-compatible biopsy forceps a shown in FIGS. 10 and 11, since a guidewire insertion hole d is formed in one of the tissue-collecting cups b and c, a living tissue is collected. At the time of work, it is necessary to move the tissue collection cups b and c to the distal end side of the distal end position of the guide wire e, and to pull out the guide wire e from the guide wire insertion hole d. Therefore, there is a problem that the operation of the biopsy forceps a at the time of the operation of collecting the living tissue becomes troublesome.

Furthermore, since the living tissue cannot be collected at the portion of the guide wire insertion hole d of the tissue collecting cup b, the living tissue collected between the tissue collecting cups b and c during one biopsy operation can be obtained. There is a problem that the amount of harvested fish decreases.

The present invention has been made in view of the above circumstances, and an object of the present invention is to easily and efficiently replace a treatment tool in a short time and to reduce the burden on both the patient and the doctor. It is an object of the present invention to provide an endoscope catheter that can collect living tissue efficiently and can increase the amount of living tissue collected in one operation.

[0017]

SUMMARY OF THE INVENTION The present invention has an insertion portion formed of a flexible tube, and is inserted into a lumen by the guidance of a guide wire inserted through the tube. In the mirror catheter, a treatment tool storage portion capable of simultaneously storing the guide wire and the other treatment tools is formed in the insertion portion, and a distal end portion of the treatment tool storage portion is more outwardly than the treatment tool storage portion. A treatment tool deriving guide means for forming a small-diameter portion having a small diameter dimension and selectively guiding either one of the guide wire or another treatment tool in the treatment-tool storage portion to the outside through the small-diameter portion; Is a catheter for an endoscope, wherein the catheter for an endoscope is provided. Then, the guide wire and other treatment tools are simultaneously stored in the treatment tool storage section of the insertion section. Furthermore, when using a guide wire or another treatment tool, either the guide wire or the other treatment tool in the treatment tool storage section is selectively selected by the treatment tool lead-out guide means, and the small diameter portion at the distal end of the treatment tool storage section is selectively used. Through to the outside.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a guide catheter 1 which is an endoscope catheter according to the present embodiment. The guide catheter 1 is provided with an elongated insertion section 2 made of a flexible tube, and an operation section 3 on a hand side connected to a base end of the insertion section 2.

Here, as shown in FIG. 2, a small-diameter portion 4 having a length L ₁ with a small outer diameter is formed at the distal end of the insertion portion 2. Further, a guide wire 5 and other treatment tools, for example, a biopsy forceps 6 can be simultaneously accommodated in a portion other than the distal end portion of the insertion portion 2 (a portion behind the small diameter portion 4) as shown in FIG. The treatment instrument storage part 7 is formed.
The treatment tool storage section 7 has a guide wire 5 inside its lumen.
And the biopsy forceps 6 are accommodated in parallel, and are set to have a thickness sufficient to allow them to move back and forth without any mutual resistance.

A smooth length L2 is provided between the treatment instrument storage section 7 and the small diameter section 4 so that the tube diameter of the tube body gradually decreases from the treatment instrument storage section 7 toward the small diameter section 4. The first tapered portion 8 is formed. Furthermore, the second end of the smooth length L3 in which the tube diameter of the tube body gradually decreases toward the front end side also at the front end of the small diameter portion 4
Is formed.

Here, the small-diameter portion 4 is set sufficiently thin in order to enhance the nipple insertion property, and the internal lumen is also thinned accordingly. For example, the outer diameter of the small diameter portion 4 is set to about 2.8 mm. The first tapered portion 8 between the treatment instrument storage section 7 and the small diameter section 4 has a lumen for the guide wire 5 and the biopsy forceps 6 which are a plurality of treatment tools stored in the treatment instrument storage section 7. It is formed with a smooth diameter change so as not to hinder longitudinal movement in the inside. further,
The second tapered portion 9 at the distal end of the small-diameter portion 4 is formed in a tapered shape so that the nipple can be easily secured.

The size (inner diameter) of the opening at the distal end of the tapered tapered portion 9 can be selected from the guide wire 5 in the treatment tool storage section 7 and the biopsy forceps 6 as another treatment tool. The size is set so that it can be inserted. Thus, the treatment tool deriving guide means 10 for selectively leading either the guide wire 5 in the treatment instrument storage portion 7 or the biopsy forceps 6 as another treatment tool to the outside through the small diameter portion 4 is configured. Have been.

As shown in FIG. 3, the operating portion 3 on the hand side has two projecting portions 11, 12 projecting rearward. Here, one of the first projecting portions 11 extends rearward along the direction of the center axis O ₁ of the insertion portion 2.
A first open end 13 is formed at the rear end of the first protrusion 11 so as to communicate with the lumen of the tube body of the insertion section 2. The guide wire 5 is inserted into the first opening end 13. The first open end 13 is provided with a sealing means (not shown) for sealing the first open end 13 in a watertight manner when the guide wire 5 is inserted.

Further, the other second protruding portion 12 extends in a direction bent at a predetermined bending angle α with respect to the direction of the center axis O ₁ of the insertion portion 2. Here, the angle between the center line O _{2 of} the second projecting portion 12 and the center axis O ₁ of the insertion portion 2 is set to α. The angle α is set to, for example, about 20 ° to 30 °. A second opening end 14 is formed at the rear end of the second protruding portion 12 so as to communicate with the lumen of the tube body of the insertion portion 2.

The biopsy forceps 6 is inserted into the second open end portion 14. And this second
A sealing means (not shown) for sealing the second open end 14 in a watertight manner when the biopsy forceps 6 is inserted is provided at the open end 14 of the biopsy forceps 6.

The first communication pipe 15 communicating between the inner cavity of the tube body of the insertion section 2 and the first opening end 13 is similarly inserted into the operation section 3 on the hand side. A second communicating part between the lumen of the tube body of the part 2 and the second open end 14
Are formed respectively.

Further, liquid feed mouthpiece 17 are projected protruded toward a direction substantially orthogonal to the central axis of the O ₁ of the outer peripheral surface of the operation portion 3 of the proximal insertion section 2. The inner end of the liquid transfer mouthpiece 17 is connected to the first communication pipe 15. Note that a syringe (not shown) is
Alternatively, a liquid feeding means such as a liquid feeding tube is connected so that a chemical such as a contrast agent is supplied.

When the guide catheter 1 of the present embodiment is used, as shown in FIGS. 4A and 4B, the first communicating end of the operation section 3 on the hand side is connected to the first communication line. 1
5 and the guide wire 5 is inserted into the lumen of the tube body of the insertion portion 2.
Is inserted, and the biopsy forceps 6 is inserted into the second open end 1.
4 through the second communication conduit 16 to be inserted into the lumen of the tube body of the insertion section 2. At this time, the first
The open end portion 13 of the guide wire 5 is hermetically sealed at the insertion portion of the guide wire 5 by a sealing means (not shown), and the second open end portion 14 is similarly sealed at the insertion portion of the biopsy forceps 6 by a sealing means (not shown). It has become so.

Further, the distal end of the guide wire 5 and the distal end of the biopsy forceps 6 inserted into the lumen of the tube body of the insertion section 2 are set in a standby state simultaneously accommodated in the treatment instrument accommodation section 7 of the guide catheter 1. It has become so. And
Either the guide wire 5 or the biopsy forceps 6 in the treatment tool storage section 7 is selectively guided to the outside through the small diameter section 4 of the insertion section 2 by the treatment tool deriving guide means 10. .

Next, the operation of the above configuration will be described.
Guide catheter 1 of the present embodiment is inserted into the patient's body through the treatment tool insertion channel of FIG advance within a patient as shown in 5, the endoscope 18 inserted, for example, in the duodenum H _1.

At the time of inserting the guide catheter 1, the guide wire 5 is previously inserted into the treatment tool housing 7 of the guide catheter 1 as shown in FIG.
Through to the outside. At this time, the biopsy forceps 6 is held in a state housed in the treatment tool housing part 7 of the guide catheter 1.

After the guide wire 5 is inserted from the nipple H ₂ of the patient into the common bile duct H ₃ , any one of the two ducts H ₅ and H ₆ branched off at the hepatic portal H _4. And guide the distal end of the guide wire 5 to a target site in the body.

Further, after the insertion of the guide wire 5, the small-diameter portion 4 of the guide catheter 1 is similarly inserted from the nipple H ₂ of the patient into the common bile duct H ₃ along the guide wire 5, and subsequently. Two pipes H branched off at the hilar port H _4
5 and H ₆ to guide the distal end of the small diameter portion 4 of the guide catheter 1 to a target site in the body.

The length of the distal end portion of the treatment instrument storage section 7 in the insertion section 2 of the guide catheter 1 (the small diameter section 4)
And the total length of the first tapered portion 8 and the second tapered portion 9) L = L ₁ + L ₂ + L ₃ is inserted into the duodenum H ₁ of the patient as shown in FIG. 5, for example. Endoscope 18
After the small-diameter portion 4 of the distal end of the guide catheter 1 protruding from the opening of the treatment instrument insertion channel to the outside of the endoscope 18 from the nipple H _{2 of the} patient into the common bile duct H ₃ , extent that can be inserted into either of the two conduits H _5, H ₆ which is branched at the hepatic portal portion H _4, for example about 100~200m
m.

Then, after the insertion of the guide catheter 1, the guide wire 5 is pulled back into the treatment instrument storage section 7 of the guide catheter 1. At this time, the guide wire 5 is held in the treatment tool storage part 7 of the guide catheter 1.

Thereafter, the liquid feeding mouth 1 of the guide catheter 1
A liquid medicine such as a contrast agent is supplied from a liquid feeding means connected to the liquid supply 7. The liquid medicine such as the contrast agent passes through the first communication conduit 15 and the lumen of the tube body of the insertion portion 2 in order from the liquid supply base 17, and opens at the distal end of the second tapered portion 9 at the distal end of the small diameter portion 4. Inserted into the body from the part.

Further, when the biopsy forceps 6 are subsequently used after the injection of a drug solution such as a contrast medium, the biopsy forceps 6 are inserted from the treatment tool storage section 7 of the guide catheter 1 as shown in FIG.
Is inserted into the small-diameter portion 4 of the guide catheter 1, and the biopsy forceps 6 is guided through the small-diameter portion 4 of the guide catheter 1 to the vicinity of a target site in the body. Then, the biopsy forceps 6 is made to protrude to the outside through the distal end opening of the second tapered portion 9 at the distal end of the small-diameter portion 4, and the distal end portion of the biopsy forceps 6 is guided to a target site in the body. The living tissue at the target site in the body is collected by the forceps 6.

Therefore, the above configuration has the following effects. That is, in the present embodiment, a treatment tool storage section 7 for simultaneously storing the guide wire 5 and the biopsy forceps 6 is provided in the insertion section 2 of the guide catheter 1, and the guide wire 5 is provided.
When the biopsy forceps 6 is used, the treatment tool deriving guide means 10 is used.
Thus, one of the guide wire 5 and the biopsy forceps 6 in the treatment instrument storage 7 is selectively led out through the small-diameter portion 4 at the distal end of the treatment instrument storage 7. Therefore, when the biopsy forceps 6 are used after the injection of the contrast medium by using the guide catheter 1, there is no need to pull the catheter out of the body as in the related art, and thus the work of replacing the guide catheter 1 with the biopsy forceps 6 is performed. Can be performed easily and efficiently in a short time. As a result, the procedure of diagnosing and treating the pancreaticobiliary duct can be simplified as compared with the conventional art, so that the burden on both the patient and the doctor can be reduced.

Further, when the biopsy forceps 6 are used, the biopsy forceps 6 in the treatment tool storage portion 7 of the guide catheter 1 are inserted into the small diameter portion 4 of the guide catheter 1 and the inside of the small diameter portion 4 of the guide catheter 1 is inserted. As a result, the biopsy forceps 6 are guided to the vicinity of the target site in the body, so that there is no need to form a guide wire insertion hole in the tissue sampling cup of the biopsy forceps 6 as in the related art. For this reason, in the biopsy forceps 6 of the present embodiment, the biopsy forceps 6 are sampled between the tissue sampling cups of the biopsy forceps 6 during one biopsy operation, compared to a biopsy forceps having a conventional guide wire insertion hole. Increase the amount of living tissue collected,
A living tissue can be efficiently collected.

Further, since the biopsy forceps 6 for collecting a living tissue is structurally limited by the use of a guide wire, that is, it is not necessary to form a guide wire insertion hole in the tissue collection cup as in the conventional case, so that the normal structure is adopted. There is also an effect that the biopsy forceps 6 can be applied.

Further, in the present embodiment, a smooth second tapered portion 9 in which the tube diameter of the tube gradually decreases toward the distal end is formed at the distal end of the small diameter portion 4 of the guide catheter 1. As shown in FIG. 5, the guide catheter 1 of this embodiment is passed through the treatment tool insertion channel of the endoscope 18 previously inserted into the patient's body, for example, the duodenum H ₁ , from the patient's nipple H ₂ into the common bile duct H ₃ . When it is made to insert in, it becomes possible to insert more smoothly.

The guide catheter 1 of the present embodiment
Is not only the combination of the guide wire 5 and the biopsy forceps 6, but also the guide wire 5 and other treatment tools such as grasping forceps,
A combination with a biopsy brush is also possible, and a similar effect can be obtained in other procedures such as removal of gallstones and abrasion biopsy of the pancreatic duct.

FIGS. 6A, 6B and 7 show a second embodiment of the present invention. In the present embodiment, the configuration of the second tapered portion 9 at the distal end of the small diameter portion 4 in the guide catheter 1 of the first embodiment (see FIGS. 1 to 5) is changed as follows. .

That is, in the present embodiment, the tube body of the guide catheter 1 is made of, for example, fluororesin, polyethylene, PET (polyethylene terephthalate), EVA
(Ethylene vinyl acetate copolymer), polyurethane, polyamide, and other flexible synthetic resin materials, and the peripheral portion of the tip opening 9a of the second tapered portion 9 shown in FIGS. 2), a substantially cross-shaped slit 21 is formed.

Therefore, in the above configuration, when the biopsy forceps 6 is not projected from the guide catheter 1, as shown in FIGS. 6A and 6B, the tip of the second tapered portion 9 is formed. Substantially cross-shaped slit 2 at the periphery of opening 9a
Can be held in the closed state of the first portion, the body of the pre-patient as shown in FIG. 5, for example through the treatment instrument insertion channel of the endoscope 18 inserted into the duodenum H ₁ of the present embodiment guides the catheter 1 when causing inserted into the common bile duct H ₃ from the nipple of H ₂ patients, allows smoother insertion.

When the biopsy forceps 6 and the guide wire 5 are used, a substantially cross-shaped slit 21 at the peripheral portion of the distal end opening 9a of the second tapered portion 9 as shown in FIG. The biopsy forceps 6 are elastically deformed by the forceps 6 and the guide wire 5 so as to be spread by the guide wire 1.
Alternatively, the guide wire 5 can be made to protrude outside. Therefore, the distal end opening 9a of the second tapered portion 9
An opening corresponding to the diameter of each treatment tool such as the biopsy forceps 6 and the guide wire 5 can be formed in the substantially cross-shaped slit 21 at the peripheral portion of the treatment tool, so that the treatment tool can be operated without resistance. I can do it.

FIG. 8 shows a third embodiment of the present invention. In the present embodiment, the treatment tool storage part 7, the first tapered part 8, and the small diameter part 4 in the guide catheter 1 of the first embodiment (see FIGS. 1 to 5) are respectively formed by separate members 31. , 32, and 33, and the treatment tool storage section 7 is a two-piece tube having different tube diameters due to the ring-shaped connecting member 32 constituting the first tapered portion 8.
And the constituent member 33 of the small diameter portion 4 is connected. Here, the ring-shaped connecting member 32 is independently formed of, for example, a metal material, a plastic material, a rubber material, or the like.

Therefore, in the present embodiment, two kinds of thin tubes having different tube diameters, that is, a constituent member 31 of the treatment tool storage portion 7 and a constituent member 33 of the small diameter portion 4 are prepared.
These are independently formed ring-shaped connecting members 32.
The treatment tool storage portion 7 of the first embodiment, the first tapered portion 8, and the small diameter portion 4 are formed by drawing one tube. As compared with the case, a temporal change in shape due to processing or thermal strain can be prevented, and further, processing cost can be reduced.

FIG. 9 shows a fourth embodiment of the present invention. In this embodiment, as shown in FIG. 9, a second tapered portion 9 is provided at the distal end of the small-diameter portion 4 in the guide catheter 1 of the first embodiment (see FIGS. 1 to 5).
Are connected.

Further, an external ring 42 is mounted on an outer peripheral surface of a connecting portion between the treatment instrument storage section 7 and the first tapered portion 8. In the present embodiment, the tip 41 and the external ring 42 are formed of a radiation shielding member. The radiation shielding member is made of, for example, a metal material such as platinum, gold, silver, palladium, tungsten, or tantalum, or a composite plastic material containing these metal material components.

Therefore, the above configuration has the following effects. That is, in this embodiment, in the procedure of the pancreaticobiliary approach using the guide catheter 1, the distal tip 4 is used by using the X-ray fluoroscope together.
Since the positions of the first ring 1 and the external ring 42 can be surely confirmed, an even easier operation can be performed.

Further, a similar radiation shielding member is also provided in the first tapered portion 8 between the treatment tool storage portion 7 and the small diameter portion 4 to measure the moving distance of the internally stored treatment tool. However, more accurate work can be performed.

Further, an external ring 42 made of a radiation shielding member may be attached to the outer peripheral surface or the inner peripheral surface of the distal end portion of the small diameter portion 4. Note that the ring-shaped connection member 32 of the third embodiment (see FIG. 8) may be formed by the radiation shielding member of the present embodiment.

Furthermore, the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention. Next, other characteristic technical matters of the present application will be additionally described as follows. (Supplementary note 1) In a body cavity having an insertion portion formed of a flexible tube body having at least one lumen extending in the axial direction from the proximal end to the distal end, in particular, endoscopically In a catheter inserted into the pancreaticobiliary duct from the duodenal papilla, it consists of a relatively thin distal part inserted into the papilla by the guidance of a guide wire for guidance and a large-diameter proximal part that smoothly changes, Has an opening communicating the lumen with the outside, the proximal lumen has a larger inner diameter than the distal part via the transition, and the storage space for the guide wire and other treatment tools is An endoscope catheter characterized in that it is formed.

(Additional Item 2) The distal end has a shape rounded to a radius larger than the wall thickness of the tube, an opening having an opening diameter smaller than the inner diameter of the distal portion lumen, and a plurality of contours of the opening. Additional item 1 characterized by forming a slit of
Endoscope catheter described in the above.

(Additional Item 3) The distal portion and the proximal portion of the tube body are formed of independent tubes having different outer diameters, respectively, and gradually transition from the outer diameter of the proximal portion to the outer diameter of the distal portion. 2. The endoscope catheter according to claim 1, wherein the transition portion is formed by a connection member having a shape.

(Additional Item 4) The endoscope catheter according to Additional Item 1, wherein at least two or more radiation shielding members are provided near the distal end and the transition portion. (Additional Item 5) The endoscope catheter according to Additional Item 4, wherein the radiation shielding member functions as an index indicating a distance between the distal end and the transition portion.

[0058]

According to the present invention, a treatment tool storage portion capable of simultaneously storing a guide wire and other treatment tools is formed in the insertion portion, and a distal end portion of the treatment tool storage portion is formed as compared with the treatment tool storage portion. A treatment tool deriving guide means for forming a small-diameter portion having a small outer diameter dimension and selectively guiding one of a guide wire or another treatment tool in the treatment-tool storage portion to the outside through the small-diameter portion is provided. Therefore, it is possible to easily and efficiently replace the treatment tool in a short time, to reduce the burden on both the patient and the doctor, and to efficiently collect biological tissue. It is possible to increase the amount of living tissue collected during the operation.

[Brief description of the drawings]

FIG. 1 is a side view showing a schematic configuration of an entire guide catheter according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a main part of a distal end portion of the guide catheter according to the first embodiment.

FIG. 3 is a longitudinal sectional view of a main part of a proximal end of the guide catheter according to the first embodiment.

FIG. 4 (A) is a side view showing a state of use of a guide wire in the guide catheter according to the first embodiment, in which a main part is sectioned, and FIG. 4 (B) is an endoscope catheter according to the first embodiment; The side view which shows the use state of the biopsy forceps in FIG.

FIG. 5 is a schematic configuration diagram of a main part showing a use state of the guide catheter of the first embodiment.

FIG. 6 shows a second embodiment of the present invention.
(A) is a side view showing the distal end of the guide catheter,
(B) is a front view showing a slit at the distal end of the guide catheter.

FIG. 7 is a side view showing a state in which biopsy forceps are inserted through the guide catheter according to the second embodiment.

FIG. 8 is a longitudinal sectional view of a main part showing a distal end portion of a guide catheter according to a third embodiment of the present invention.

FIG. 9 is a longitudinal sectional view of a main part showing a distal end portion of a guide catheter according to a fourth embodiment of the present invention.

FIG. 10 is a side view of a main part showing a distal end portion of a conventional biopsy forceps.

FIG. 11 is a side view of a main part of a biopsy forceps showing another conventional example.

[Explanation of symbols]

 2 insertion part 4 small diameter part 5 guide wire 6 biopsy forceps (treatment instrument) 7 treatment instrument storage unit 10 treatment instrument derivation guide means

Claims (1)

[Claims] 1. An endoscope catheter having an insertion portion formed of a flexible tube, and inserted into a lumen by guiding a guide wire inserted through the tube, A treatment tool storage part capable of simultaneously storing the guide wire and the other treatment tools, and a small-diameter narrower outer diameter than the treatment tool storage part at the distal end of the treatment tool storage part. And a treatment tool deriving guide means for selectively leading one of the guide wire and the other treatment tool in the treatment tool storage portion to the outside through the small diameter portion. Endoscope catheter.