JPH0661365B2 - Catel tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention is, for example, a catheter that is used by being inserted into a body cavity and performs observation of the inside of the body cavity and / or medical treatment from an external position to an inner wall surface of the body cavity, The present invention relates to a catheter tube that constitutes an endoscope (fiberscope).

<Prior Art> An endoscope observes the inside of a body cavity inserted from an extracorporeal position,
Furthermore, since medical treatments such as administration of a liquid medicine to the inner wall of a body cavity and irradiation of a laser beam can be performed, attention has been paid in recent years and its development has been advanced.

When observing the inside of a blood vessel using an endoscope, the blood that obstructs the visual field in the portion to be observed is removed before the observation.

Conventionally, this method of removing blood excludes blood by inflating a balloon formed around the outer circumference of the tube to block the flow of blood, and then ejecting a transparent liquid such as physiological saline to the part to be observed. It is carried out by filling the transparent liquid.

However, in this method, for example, backflow of blood may occur during observation in an artery, and since blood cannot be blocked for a long time in consideration of safety to the human body, observation time is limited. There are also drawbacks.

<Problems to be Solved by the Invention> An object of the present invention is to solve the above-mentioned drawbacks of the prior art, and to provide a catheter tube capable of long-term observation and medical treatment in a body cavity, particularly a blood vessel. Especially.

<Means for Solving the Problems> In order to achieve such an object, the present inventors have first and second balloons that expand into the tube body and block the blood flow. A catheter tube that can be filled with a transparent liquid to eliminate blood that obstructs the field of view for observation, and a bypass that connects the outsides of both balloons to each other is provided. The present invention has been accomplished by finding a catheter tube that allows blood to flow.

That is, the present invention is a catheter tube used by being inserted into a body cavity, comprising: a tube main body; a first balloon that is installed around the tube outer peripheral wall near the tip of the tube main body and is expandable and contractible; A second balloon that is installed around the outer peripheral wall of the tube at a predetermined distance from the first balloon to the base end portion; a means for inflating and deflating the first balloon and the second balloon; and the first balloon A lumen capable of accommodating an observation means for observing the inside of the body cavity from between the first and second balloons, and a lumen for injecting and / or discharging a fluid into the body cavity from between the first balloon and the second balloon, The tube main body is formed in a first opening formed in the tube main body on the distal side of the first balloon and a tube main body on the proximal side of the second balloon. It is intended to provide a catheter tube having a bypass lumen communicating with the formed second opening.

Further, it is preferable that the minimum diameter of the first and second balloons when inflated is substantially equal to or larger than the maximum inner diameter of the body cavity to be inserted.

The distance between the proximal end side of the first balloon and the distal end side of the second balloon is preferably 1 to 100 mm.

Hereinafter, a preferred embodiment of the catheter tube of the present invention shown in the accompanying drawings will be described in detail.

In the following description, the case where the catheter tube of the present invention is applied to an endoscope will be described as a representative, but the present invention is not limited to this.

FIG. 1 is a side view showing a configuration example of a catheter tube 1 of the present invention, and FIG. 2 is a longitudinal sectional view thereof (for easy understanding, the lumens are shown in parallel.

As shown in FIG. 1, the catheter tube 1 has a tube body 2, and a first balloon 3 is installed around the tube outer peripheral wall near the tip (left side in the figure) of the catheter body 1. The second balloon 4 is installed around the outer peripheral wall of the tube at a position on the side (the right side in the drawing) at a predetermined interval. The first and second balloons 3 and 4 are made of a rubber material such as silicone rubber or latex rubber or urethane, PVC, EVA, etc., and are inflatable and defensible.

The tube body 2 is made of a flexible material such as polyvinyl chloride, polyurethane, silicone rubber, PE, nylon, EVA, or the like.

Various lumens having different uses and functions as described below are formed in the tube body 2.

The lumen 5 is an opening 5 formed in an arbitrary portion of the tube outer peripheral wall 21 between the first balloon 3 and the second balloon 4.
It is for communicating with 1 and for injecting and / or discharging a fluid from the opening 51 into the body cavity. Specifically, this lumen 5 is used to administer a drug solution or the like into the body cavity into which the catheter tube 1 has been inserted and left, or
When observing the inside of a blood vessel with an endoscope, a transparent liquid (for example, saline) that pushes out blood that obstructs the field of vision.
It is also used as a channel for the flash that ejects.

The lumen 6 is for accommodating a light transmitting fiber (light guide) 10 and a light receiving fiber (image fiber) 11 as an observing means for observing the inner wall of the body cavity when the catheter tube 1 is used for an endoscope. is there. Observation of the inner wall of the body cavity is performed by the first balloon 3 and the second balloon 4.
The lumen 6 communicates with an opening 61 formed in an arbitrary portion of the tube outer peripheral wall 21 between them.

The light-sending fiber 10 guides the light emitted from the light source and irradiates it to the observation section from its tip, and the light-receiving fiber 11 takes in the image from the observation section from the tip and guides it to the image receiving section. It is a thing. Each of these is composed of an optical fiber such as quartz, plastic, or multi-component glass.

As shown in FIG. 2, the lumen 7 communicates with the inside of the first balloon 3 and enters into the first balloon 3 a fluid (whether a gas or a liquid, but in consideration of safety such as insertion into a blood vessel,
Liquid is preferable) to inflate the first balloon 3 or discharge the fluid to deflate the balloon 3. Similarly, the lumen 8 is also communicated with the inside of the second balloon 4 to inflate and deflate the balloon 4. In addition, the lumens 6 and 7 are not provided for each of the balloons 3 and 4, and only one lumen is used for the balloon 3.
And 4 to communicate with both balloons 3, 4 at the same time,
You may make it shrink.

The means for inflating and deflating the first and second balloons need not necessarily be the lumen formed in the tube body 2, but instead of these, the tube body 2
An air supply tube or a liquid supply tube that communicates with the balloons 3 and 4 may be separately provided outside.

Any part of the tube body on the tip side of the first balloon 3 (either the tip of the tube body or the tube outer peripheral wall 21)
Is formed with a first opening 91, while a second opening 92 is formed in the outer peripheral wall 21 of the tube body on the proximal end side of the second balloon 4, and the first opening 91 and the second opening 92 are formed. A bypass lumen 9 is formed so as to communicate with each other.

Through this bypass lumen 9, blood on the distal side of the first balloon 3 and blood on the proximal side of the second balloon 4 can flow in the blood vessel.

The outer diameter of the tube body 2 and the lumens 5, 6,
The inner diameters of 7, 8 and 9 may be appropriately determined according to the inner diameter of the body cavity (blood vessel) to be inserted, but the inner diameter of the bypass lumen 9 is preferably 0.3 mm or more. The reason is that blood flow becomes difficult if the inner diameter is less than 0.3 mm.

The first balloon 3 and the second balloon 4 are adapted to be in close contact with the inner wall surface of the body cavity to be inserted at the time of expansion, and have a role of fixing the catheter tube 1 to the body cavity, and the first balloon 3 and the second balloon 4. It has the role of eliminating blood that obstructs the field of view and blocking the inflow of blood when replacing it with a transparent liquid.

Such a first balloon 3 and a second balloon 4 are
When expanded, it is preferable to expand radially from the center of the tube body 2.

The cross-sectional shape of the first balloon 3 and the second balloon 4 may be a circle, an ellipse, or the like,
It is preferable that the shape is close to the cross-sectional shape of the body cavity to be inserted and indwelled, because the adhesion to the body cavity will be good. Especially the first
The diameter (minimum diameter) Dmin of the portion where the diameter of each of the balloon 3 and the second balloon 4 is minimum when inflated, and the diameter of the portion where the diameter of the inner wall of the body cavity to be inserted or indwelled (when the body cavity is deflated) ( It is preferable that the relationship with the maximum diameter) dmax is Dmin ≧ dmax, because both balloons 3 and 4 are surely brought into close contact with the inside of the body cavity.

The gap distance S between the first balloon 3 and the second balloon 4
Is preferably 1 to 100 mm.

The reason is that when S is larger than 100 mm, the bypass distance of the lumen 9 becomes long, and therefore the flow path resistance becomes large,
Further, the amount of flushing of the transparent liquid is large and the safety to the human body is lowered, and if S is less than 1 mm, it becomes difficult to observe the blood vessel wall.

The first balloon 3 and the second balloon 4 need to be attached to the tube body 2 in an airtight or liquid-tight state. As a method for attaching the same, another member (annular or bag-shaped rubber member, etc.) is bonded. It is possible to use a method in which the balloon is air-tight or liquid-tight, such as a method in which the balloon is adhered with an agent or a thread is used to bind the balloon, or a method in which the balloon is integrally molded or two-color molded.

<Operation> The operation of the catheter tube 1 of the present invention will be described below.

FIG. 4, FIG. 5 and FIG. 6 are partial cross-sectional side views showing the usage state of the catheter tube 1 of the present invention.

As shown in FIG. 4, when the catheter tube 1 as an endoscope is inserted into a body cavity, that is, a blood vessel 12, a fluid is sent from the lumen 8 into the second balloon 4 to inflate the second lane 4, 2 The balloon 4 is the inner wall surface 1 of the blood vessel 12.
3, the catheter tube 1 is fixed to the blood vessel 12, and the flow of blood 14 in the blood vessel 12 (which can be either left or right in the figure) is blocked.

In this state, as shown in FIG. 5, a transparent liquid 15 such as physiological saline is ejected from the opening 51 through the lumen 5,
Blood on the tip side is pushed out from the second balloon 4 and eliminated,
Instead, the transparent liquid 15 is filled.

Next, as shown in FIG. 6, a fluid is fed from the lumen 7 into the first balloon 3 to inflate the first balloon 3 and bring it into close contact with the inner wall surface 13 of the blood vessel 12.

In this state, a transparent liquid 15 is provided between the first balloon 3 and the second balloon 4 in the blood vessel 12 instead of the blood which obstructs the view.
The opening 61 formed in the outer peripheral wall 21 of the tube.
Thus, the inner wall surface 13 of the blood vessel can be observed through the light-sending and light-receiving fibers 10 and 11.

By rotating the catheter tube 1 itself in the blood vessel 12, the entire circumference of the blood vessel inner wall surface 13 can be observed.

On the other hand, the blood 14 on the distal end side of the first balloon 3 and the blood 14 on the proximal end side of the second balloon 4 can flow through each other via the bypass lumen 9. For example, if blood is flowing in the direction of arrow 16 in FIG.
The blood 14 on the proximal end side enters through the second opening 92, flows through the bypass lumen 9, and exits from the first opening 91 toward the distal end side of the first balloon 3. As described above, even during the observation, the circulation of the blood in the blood vessel 12 is secured, so that the observation can be performed for a long time.

Further, since the observation portion inside the blood vessel is within the range partitioned by the first balloon 3 and the second balloon 4 which are in close contact with the inner wall surface 13 of the blood vessel, the blood 1 is transferred into the transparent liquid 15 between the two balloons.
4 does not flow in, and clear observation is possible.

In the above description, the case of observing the inside of the blood vessel with the light-transmitting fiber and the light-receiving fiber has been described, but the use of the catheter tube 1 of the present invention is not limited to this. It can be applied to a wide range of fields such as laser beam irradiation through, and tip guidance when inserting into a target site.

<Example> (Example 1) A catheter tube having a structure shown in Figs. 1 and 2 was prepared. The conditions of this catheter tube are as follows.

<Tube body> Material: Polyvinyl chloride containing X-ray contrast agent Outer diameter: Approximately 2.5 mm Overall length: Approximately 1.5 m Lumen: 5 lumen Lumen for ejecting transparent liquid, Lumen for fiber storage, 1st and 1st Lumen for expansion of the second balloon, 1 for lumen, 1 for bypass (inner diameter 1.2 mm) Lumen storage: Image fiber (bundling about 2000 quartz fibers of about 2 to 3 μm) and light guide (about 50 μm)
25 quartz fibers of m) were integrated into one fiber bundle having an outer diameter of about 0.8 mmφ.

A convex lens is attached to the end face of the image fiber and receives the light emitted from the light guide to form a subject image on the end face of the image fiber.

<First balloon> Material: Latex rubber Thickness: Approximately 150 μm Shape: Cylindrical effective length: 7 mm Inflated diameter: 6 mm <Second balloon> Material: Latex rubber Thickness: Approximately 150 μm Shape: Cylindrical effective length: 7 mm Expansion Time diameter: 6 mm Gap distance from first balloon S: 25 mm <Catheter tube base end> An eyepiece was attached to the base end of the image fiber to enable direct observation. An optical connector was attached to the base end of the light guide and connected to a white light source. A stopcock having a luer taper receiving port was attached to the proximal end of the lumen for ejecting a transparent liquid, and a syringe A was connected to the stopcock so that physiological saline could be supplied to the lumen. At the base end of each lumen communicating with the first and second balloons, a valve having a luer taper receiving port is attached, and syringes B and C are connected to these valves to inflate the fluid (saline solution) into each balloon. Can be injected.

Such a catheter tube was inserted into a blood vessel having an inner diameter of about 5 mm. First, the syringe C was manually operated to inflate the second balloon to fix the catheter tube to the blood vessel and block the blood flow.

Next, the syringe A was operated to inject 1.5 ml of physiological saline into the blood vessel on the tip side of the first balloon to eliminate blood.

Then, the syringe B was manually operated to inflate the first balloon.

The saline was filled between the first balloon and the second balloon.

In this state, observation of the inner wall surface of the blood vessel was performed without looking through the eyepiece or on the video monitor screen. As a result, clear observation was possible without inflow of blood into the observation portion.

The time required for this observation was about 1 minute. During the observation, blood flowed through the bypass lumen in the blood vessel.

<Effects of the Invention> According to the catheter tube of the present invention, the inside of the body cavity is observed and medical treatment is performed in a space partitioned by the first balloon and the second balloon in the body cavity. When observing with the first balloon and the second
Clear observation is possible without blood flowing into the transparent liquid filled between the balloons, which hinders the visibility.

Furthermore, in the catheter tube of the present invention, when a bypass lumen is provided in the tube body, the fluid on the distal side of the first balloon in the body cavity through the bypass lumen (for example, during observation of the inside of the body cavity) (for example, The blood in the blood vessel) and the fluid on the proximal side of the second balloon can flow.

Therefore, in the related art, which involves blocking the blood flow in the blood vessel during observation, it was not possible to observe for a long time due to the safety limitation of the human body, but according to the present invention, the circulation of blood is secured even during observation. Therefore, it is possible to observe for a long time.

[Brief description of drawings]

FIG. 1 is a side view showing one structural example of the catheter tube of the present invention. FIG. 2 is a vertical cross-sectional view of the catheter tube of the present invention. FIG. 3 is a sectional view taken along the line III-III in FIG. 4, 5, and 6 are partial cross-sectional side views showing examples of use of the catheter tube of the present invention. DESCRIPTION OF SYMBOLS 1 ... Catheter tube, 2 ... Tube body, 21 ... Tube outer peripheral wall, 3 ... First balloon, 4 ... Second balloon, 5, 6, 7, 8 ... Lumen, 51, 61 ...... Aperture, 9 ... Bypass lumen, 91 ... First aperture, 92 ... Second aperture, 10 ... Light transmitting fiber, 11 ... Receiving fiber, 12 ... Body cavity (blood vessel), 13 ... … Inner wall, 14 …… Blood, 15 …… Transparent liquid, 16 …… Blood flow direction

Claims (3)

[Claims] 1. A catheter tube which is used by inserting it into a body cavity, comprising: a tube body, a first balloon which is installed around a tube outer peripheral wall near the tip of the tube body and which can be inflated and deflated, A second balloon which is installed around the tube outer peripheral wall at a predetermined distance on the proximal side from the balloon and which can be inflated and deflated; a means for inflating and deflating the first balloon and the second balloon; and the first balloon A lumen capable of accommodating an observing means for observing the inside of the body cavity from between the second balloons; a lumen for injecting and / or discharging a fluid into the body cavity from between the first balloon and the second balloon; The tube body portion is formed in a first opening formed in the tube body on the distal side of the first balloon and in the tube body on the proximal side of the second balloon. A catheter tube having a bypass lumen communicating with the opened second opening. 2. The catheter tube according to claim 1, wherein the first and second balloons have a minimum diameter when inflated, which is substantially equal to or larger than a maximum inner diameter of a body cavity to be inserted. 3. The catheter tube according to claim 1, wherein the distance between the proximal end side of the first balloon and the distal end side of the second balloon is 1 to 100 mm.