JPH0410810B2 - - Google Patents

Description

Detailed Description of the Invention <Industrial Application Field> The present invention is used by being inserted into a body cavity, for example,
The present invention relates to a catheter for observing the inside of a body cavity and/or performing medical treatment from an extracorporeal position to the inner wall surface of the body cavity, particularly a catheter tube constituting an endoscope (fiberscope).

<Prior art> Endoscopes have attracted attention in recent years because they can observe the inside of a body cavity inserted from a position outside the body, and can also perform medical procedures such as administering medical solutions to the inner wall of the body cavity and irradiating laser beams. Its development is progressing.

This endoscope, especially an endoscope for observing inside narrow body cavities such as blood vessels, has a flexible catheter tube that houses a bundle of optical fibers for transmitting and receiving light. When inserted to the target area, the light emitted from the tip of the light transmitting fiber (light guide) is irradiated to the observation section, the reflected light is captured from the tip of the light receiving fiber (image fiber), and the image is sent to the image receiving section. Observation is carried out by guiding.

Furthermore, when observing the inside of a blood vessel using an endoscope, the observation is performed after removing blood that would obstruct the field of view in the area to be observed.

By the way, in a conventional endoscope, the distal end of an optical fiber bundle including a light guide and an image fiber is fixed on substantially the same plane as the distal end of a catheter tube. Therefore, when inserting a catheter tube into a body cavity, the tip of the optical fiber bundle comes into contact with the instrument for inserting the catheter tube (guide catheter), etc., and the tip surface of the image fiber, which is the light-receiving surface, is scratched and the observed image is The disadvantage is that the sharpness of the image is lost.

Furthermore, in the method of fixing the optical fiber bundle, the tip of the optical fiber bundle is aligned with the tip of the catheter tube, and the tip of the optical fiber bundle is bonded and fixed with adhesive. This has the disadvantage that the adhesive tends to adhere to the surface, which ultimately has a negative effect on the clarity of the observed image.

Additionally, in order to prevent the tip of the optical fiber from being damaged, it may be possible to fix the tip of the optical fiber while retracting it into the lumen of the catheter tube, but this would cause the inner wall of the lumen to obstruct the field of vision. Observation becomes difficult or only a very narrow field of view can be observed.

Furthermore, with conventional endoscopes, when changing the observation site within a body cavity (in the longitudinal direction of the body cavity), the balloon is deflated once to release the fixation of the catheter tube from the body cavity, and then the catheter tube is moved in the longitudinal direction of the body cavity to the target site. Another drawback is that the catheter tube must be moved to the body cavity, the balloon must be inflated again, the catheter tube must be fixed to the body cavity, and a transparent liquid must be ejected for observation, which is a complicated operation.

<Problems to be Solved by the Invention> An object of the present invention is to provide a catheter tube that eliminates the above-mentioned drawbacks of the prior art and enables clear and wide-field observation when configured, for example, in an endoscope. It's about doing.

<Means for Solving the Problems> In order to achieve such an objective, the present inventors have made extensive research and have made it possible to move a bundle of optical fibers, which is an observation instrument, in the axial direction of the catheter tube. When inserting the tube into a body cavity, the tip of the optical fiber bundle is positioned within the optical fiber storage lumen, and when observing the inside of the body cavity, the tip of the optical fiber bundle can be protruded to the outside for observation. We have discovered a catheter tube with a structure that allows for this, and have arrived at the present invention.

That is, the present invention includes the following (1) to (10).

(1) A catheter tube used by being inserted into a body cavity, which comprises: a tube body; at least one balloon that can be inflated and deflated and installed around the outer peripheral wall of the tube near the tip of the tube body; and the tube body; first and second lumens that are formed in the tube body and open to the distal end of the tube body; a third lumen that is formed in the tube body and communicates with the balloon; and a third lumen that is housed in the first lumen and is used to observe the inside of the body cavity. and an operating tool installed on the proximal end side of the catheter tube to move the observation device in the axial direction of the tube body and fix the observation device at a required position with respect to the tube body. The operating tool includes a cylindrical female connector fluid-tightly connected to communicate with the base end of the first lumen, and an inner cylinder of the female connector that holds the inner cylinder fluid-tightly. and a piston-shaped male connector to which the observation instrument is fixed.

(2) the observation instrument is a bundle of optical fibers;
The catheter tube according to (1) above, wherein the inner diameter of the first lumen is 1.1 to 3.0 times the outer diameter of the optical fiber bundle.

(3) The catheter tube according to (1) or (2) above, wherein the surface of the optical fiber bundle and/or the inner surface of the first lumen are lubricated.

(4) The movement range of the operating tool is from a protected position inside the first lumen to a position where the distal end of the observation instrument protrudes from the distal opening of the first lumen by 0 to 20 mm. The catheter tube according to any one of 3).

(5) The catheter tube according to any one of (1) to (4) above, wherein the balloon has a minimum diameter when inflated that is approximately equal to or greater than the maximum internal diameter of the body cavity into which it is inserted.

(6) A catheter tube that is used by being inserted into a body cavity, which comprises: a tube body; at least one balloon that can be inflated and deflated and installed around the outer peripheral wall of the tube near the tip of the tube body; and the tube body; first and second lumens that are formed in the tube body and open to the distal end of the tube body; a third lumen that is formed in the tube body and communicates with the balloon; and a third lumen that is housed in the first lumen and is used to observe the inside of the body cavity. and an operating tool installed on the proximal end side of the catheter tube to move the observation device in the axial direction of the tube body and fix the observation device at a required position with respect to the tube body. and the operating tool includes a sealed bellows tube that is fluid-tightly connected to communicate with the proximal end of the first lumen, and the observation instrument is fixed to the proximal end of the closed bellows tube.
A catheter tube comprising a holder that accommodates the bellows tube and can regulate the degree of expansion and contraction of the bellows tube.

(7) The observation instrument is a bundle of optical fibers,
The catheter tube according to (6) above, wherein the inner diameter of the first lumen is 1.1 to 3.0 times the outer diameter of the bundle of optical fibers.

(8) The catheter tube according to (6) or (7) above, wherein the surface of the optical fiber bundle and/or the inner surface of the first lumen are lubricated.

(9) The movement range of the operating tool is from a protected position inside the first lumen to a position where the tip of the observation instrument protrudes from the opening of the tip of the first lumen by 0 to 20 mm, or (6) above. The catheter tube according to any one of 8).

(10) The catheter tube according to any one of (6) or (9) above, wherein the balloon has a minimum diameter when inflated that is approximately equal to or greater than the maximum internal diameter of the body cavity into which it is inserted.

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

In the following description, a case will be described in which the catheter tube of the present invention is typically applied to an endoscope, 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, FIG. 2 is a partial vertical sectional view showing a configuration example of the distal end side of the catheter tube 1 of the present invention, and FIG. It is a sectional view taken along the - line in the figure.

As shown in these figures, the catheter tube 1 has a tube body 2, and a balloon 6 is installed around the outer peripheral wall of the tube body near its distal end (left side in FIG. 1).

The balloon 6 is made of a rubber material such as silicone rubber or latex rubber, or urethane, polyvinyl chloride (PVC), ethylene/vinyl acetate copolymer (EVA), etc., and is capable of expanding and contracting.

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

The tube body 2 is formed with various lumens having different uses and functions as described below.

The first lumen 3 is open to the distal end of the tube body 2, and in this lumen, when the catheter tube 1 is used for an endoscope, an optical fiber bundle 7 as an observation instrument for observing the inner wall of the body cavity is placed. It is housed so that it can move in the axial direction of the tube body.

As shown in FIG. 3, this optical fiber bundle 7 is composed of a light transmitting fiber (light guide) 8 and a light receiving fiber (image fiber) 9.
is located near the tip opening 31 of the first lumen 3. Light emitted from a light source (not shown) on the proximal end side of the catheter tube 1 (right side in FIG. 1) is transmitted through the light transmitting fiber 8, and is irradiated from its tip to the observation area, and the reflected light is is taken in from the tip of the light-receiving fiber 9, and the image is transmitted within the fiber 9 and guided to an image-receiving section (not shown) on the proximal end side of the catheter tube.

These light transmitting and light receiving fibers are both made of optical fibers such as quartz, plastic, and multi-component glass.

Note that, in order to smoothly move the optical fiber bundle 7 within the first lumen 3, it is preferable to perform smoothing treatment on the surface of the optical fiber bundle 7 and/or the inner surface of the first lumen 3.

Examples of the lubrication treatment include coating with a lubricant such as silicone oil, Teflon, olive oil, glycerin, and polyethylene glycol, and hydrophilic treatment.

The second lumen 4 is open to the distal end of the tube body 2, and through this opening 41, fluid can be injected into the body cavity or fluid can be suctioned from the body cavity. Specifically, the lumen 4 is used to introduce a drug solution into a body cavity in which the catheter tube 1 is inserted and indwelled, or it obstructs the view when observing the inside of a blood vessel with an endoscope. It is also used as a lid channel that sprays a transparent liquid (eg, physiological saline) to force blood out.

As shown in FIG. 3, the third lumen 5 communicates with the inside of the balloon 6, and the third lumen 5 communicates with the inside of the balloon 6 so that fluid (gas or liquid may be used, but considering safety when inserting into a blood vessel, etc.), the third lumen 5 communicates with the inside of the balloon 6. (preferably) to inflate the balloon 6, or expel fluid to deflate the balloon 6.

This balloon 6 is designed to come into close contact with the inner wall surface of the body cavity into which it is inserted when inflated, and serves to fix the catheter tube 1 to the body cavity, and to prevent blood that may obstruct the view in front of the balloon 6 (on the tip side of the tube). It has the role of blocking the inflow of blood when removing it and replacing it with a transparent liquid.

It is preferable that such a balloon 6 expands radially from the center of the tube body 2 when inflated.

The cross-sectional shape of the balloon 6 can be a circle, an ellipse, or any other similar shape; however, it is preferable to have a cross-sectional shape similar to the cross-sectional shape of the body cavity into which it is inserted and indwelled, since it will have good adhesion to the body cavity. .

In particular, the diameter of the part where the diameter in the tube radial direction is the smallest when the balloon 6 is inflated (minimum diameter) Dmin
and the diameter (maximum diameter) dmax of the part where the inner wall diameter of the body cavity to be inserted and indwelled (when the body cavity contracts) is maximum.
If we make the relationship Dmin≧dmax,
The balloon 6 is preferable because it securely fits inside the body cavity.

A plurality of such balloons may be formed along the longitudinal direction of the tube body 2.

Note that the balloon 6 needs to be attached to the tube body 2 in an air-tight or liquid-tight manner,
The attachment methods include gluing a separate member (ring-shaped or bag-shaped rubber member, etc.) with adhesive or tying it with thread, or molding it integrally with the tube or two-color molding. Any method that maintains confidentiality is possible.

As shown in FIG. 1, the proximal end 10 of the catheter tube 1 has three tubes 11, 12 and 1.
The tubes 11, 12, and 13 are branched into the first lumen 3 of the tube body 2, respectively.
It is connected to the second lumen 4 and the third lumen 5.

The proximal end of the tube 11 is connected to a connector tube 16 via a T-tube 14, and the optical fiber bundle 7
The optical fiber bundle 7 is inserted through the tube 11, the T-tube 14, and the connector tube 16, and is moved to the proximal end of the connector tube 16 in the axial direction of the tube body 2. An operating tool 17 is installed to be fixed at a desired position with respect to the tube body 2. Note that these are all connected in a liquid-tight manner. Below, operating tool 17
I will explain about it.

FIG. 4 is a longitudinal sectional view showing an example of the configuration of the operating tool 17.

As shown in the figure, the operating tool 17 is a means (liquid-tight holding member) capable of keeping the base end side of the first lumen liquid-tight.
The connector is a cylindrical connector, and one end thereof is connected to the proximal end of the connector tube 16, and a piston is connected to the inner cylinder of the female connector 18 through a sealing member 20 such as a rubber ring. It has a structure in which a shaped male connector 19 is inserted.
The optical fiber bundle 7 is fixed to the male connector 19, and when the male connector 19 is moved in the axial direction (in the direction of the arrow in FIG. 4), the optical fiber bundle 7 also moves inside the first lumen 3. Move in the axial direction of the tube body.

The range of movement of the optical fiber bundle 7 is from a state in which the distal end 71 of the optical fiber bundle is located at the protected position in the first lumen 3 (the state shown in FIG. 7) to The range may be such that the portion 71 protrudes from the distal end opening 31 of the first lumen by 0 to 20 mm (the state shown in FIG. 8).

This is because if the protruding length of the tip of the optical fiber bundle exceeds 20 mm, there is a risk of damaging the blood vessel wall or breaking the optical fiber.

The range of movement of the optical fiber bundle 7 can be set by adjusting the fixing position of the optical fiber bundle with respect to the male connector 19.

The sealing member 20 is fixed to the male connector 19, and when the male connector is moved in the axial direction, the sealing member 20 is attached to the inner surface 181 of the female connector 18.
It is designed to slide in close contact with the
This maintains liquid tightness.

Further, when the male connector 19 is stationary, the position of the optical fiber bundle 7 with respect to the tube body 2 is fixed.

When performing observation using the catheter tube 1, fluid, for example, a liquid such as physiological saline, is injected from the fluid injection connector 15 attached to the T-tube 14, and the first lumen 3, the inside of the tube 11, and the
The liquid fills the inside of the cross tube 14, the inside of the connector tube 16, and the inside of the female connector 18.

This prevents blood from flowing into the first lumen 3 from the tip opening 31 when the catheter tube 1 is inserted and placed in the blood vessel, or
This is to prevent the formation of blood clots due to blood flowing into the lumen. Therefore, a sealing member 20 is provided to prevent the liquid or the blood that has flowed from leaking out of the catheter tube 1.

Note that the seal member 20 is made of an elastic material,
When the male connector is operated, it is movable, and in its natural state it is preferably in close contact with the inner surface of the female connector 18 to the extent that it is not moved by the pressure of the liquid within the female connector 18.

Furthermore, means for fixing the male connector may be provided.

Unlike the example shown in FIG.
1, and a male connector 19 having an outer diameter slightly larger than the inner diameter of this ring may be fitted into the ring.

FIG. 5 is a longitudinal sectional view showing another example of the configuration of operation 517. As shown in the figure, a telescopic bellows tube 21 made of, for example, ethylene/vinyl acetate copolymer, polyvinyl chloride, or polyethylene is connected to the base end of the connector tube 16.
The optical fiber bundle 7 is fixed to the proximal end 211 of the bellows tube 21 so that the optical fiber bundle 7 moves in the axial direction of the tube body (in the direction of the arrow in FIG. 5) as the bellows tube 21 expands and contracts. It's summery.

Note that this bellows tube 21 is of a closed type,
Similarly to the above, liquid tightness on the proximal end side of the first lumen 3 is ensured.

Such a bellows tube 21 is housed in a holder 22 that includes a cylinder body 23 and a lid body 24. A female thread 231 and a male thread 241 are formed in the cylinder body 23 and the lid body 24, respectively.
4 relative to the cylindrical body 23 and screw them together,
The degree of expansion and contraction of the bellows tube 21 can be determined by the number of rotations. Due to the repulsive force of the bellows tube 21, the proximal end 211 and the distal end 2 of the bellows tube 21
12 are in contact with the inner bottom of the lid 24 and the inner bottom of the cylinder 23, respectively, and when the lid 24 is stationary, the degree of expansion and contraction of the bellows tube 21 is maintained constant, that is, the tube body 2 The position of the optical fiber bundle 7 is fixed relative to the optical fiber bundle 7.

Note that any part of the operating tool 17 described above (for example,
A scale may be provided on the male connector 19 or the holder 22) so that the moving distance of the optical fiber bundle 7 (the length of protrusion from the tip opening 31) can be determined.

<Function> Hereinafter, the function of the catheter tube 1 of the present invention will be explained.

6, 7, and 8 are partially sectional side views showing the catheter tube 1 of the present invention in use.

As shown in FIG. 6, a catheter tube 1 as an endoscope is inserted into a target site within a body cavity, that is, a blood vessel 25. At this time, the distal end portion 71 of the optical fiber bundle 7 is positioned at a protected position within the first lumen 3 by operating the operating tool 17 on the proximal end side of the catheter tube. As a result, when the catheter tube 1 is inserted, the distal end 7 of the optical fiber bundle is
1 (especially the light receiving surface) is a guide catheter or blood vessel 27
This prevents damage to the inner wall surface 271 of the blood vessel 27 due to contact, or damage to the inner wall surface 271 of the blood vessel 27 caused by the distal end portion 71 of the optical fiber bundle.

Next, a fluid for balloon inflation (for example, a liquid such as physiological saline or a gas such as Co ₂ gas) is injected from the balloon connector 26 on the proximal end side of the catheter tube, and the fluid is inserted into the tube 13 and the third tube.
The seventh balloon is sent into the balloon 6 through the lumen 5.
The balloon 6 is inflated as shown in the figure.

The inflated balloon 6 touches the inner wall surface 27 of the blood vessel 27.
1 and fixes the catheter tube 1 to the blood vessel 27, as well as blood 28 in the blood vessel 27.
to cut off the flow of water.

Furthermore, a transparent liquid 29 such as physiological saline is injected from the flush connector 25 on the proximal end side of the catheter tube, and the transparent liquid 29 is passed through the tube 12 and the second lumen 4 through the opening 41 at the distal end of the tube body 2. Squirt, balloon 6
The blood 28 further forward (towards the tip of the tube) is pushed out and removed, and the transparent liquid 29 is filled instead.

Note that if the minimum diameter of the balloon 6 when inflated is approximately equal to or larger than the maximum internal diameter of the blood vessel 27, the balloon 6 will surely come into close contact with the inner wall surface 271 of the blood vessel 27, and the balloon 6 will be in close contact with the inner wall 271 of the blood vessel 27, The blood 28 (on the end side) does not flow into the front of the balloon 6, that is, into the observation area, making it possible to observe a clear image.

Next, grasp the operating flange 191 of the operating tool 17 on the proximal end side of the catheter tube shown in FIG.
By operating the male connector 19, the optical fiber bundle 7
is moved toward the distal end side of the catheter tube (in the direction of the arrow in FIG. 4) within the first lumen 3, and as shown in FIG.
is made to protrude a predetermined length from the tip opening 31 of the first lumen. Thereby, the inside of the blood vessel 27 can be observed through the light transmitting and light receiving fibers 8 and 9 without the visual field being obstructed by the inner wall of the first lumen 3.

In this case, the movement of the optical fiber bundle 7 is easily and reliably performed by the operating tool 17, and when the optical fiber bundle 7 is moved, the outer surface of the optical fiber bundle 7 and the sealing member 20 etc. do not slide. Therefore, the optical fiber bundle 7 is not bent, scratched, or damaged.

Note that during observation, it is preferable to adjust the moving distance of the male connector 19 to position the tip end 71 of the optical fiber bundle at the optimal observation position. Also, blood vessel 2
When changing the observation site within 7 by a predetermined length in the blood vessel longitudinal direction, it is not necessary to deflate the balloon 6 to release its fixation to the blood vessel 27 and move the catheter tube 1 itself, and the same operation as above is performed. The operation is extremely simple because it is only necessary to move the position of the tip end 71 of the optical fiber bundle to the observation site to be changed.

Note that the first lumen 3, tube 11, T-tube 14, connector tube 16, and female connector 18 are filled in advance with a liquid (e.g., physiological saline) injected from the fluid injection connector 15. , this liquid, by the seal member 20 interposed between the female connector 18 and the male connector 19.
Alternatively, the blood that has flowed into the liquid from the tip opening 31 is prevented from leaking out.

In addition, in a natural state (a state in which no external force is applied to the male connector), the male connector 19 is fixed to the female connector 18 by the elastic force of the sealing member 20, so that the optical fiber bundle 7 Its position relative to the tube body 2 is fixed.

In addition, when using the operating tool 17 shown in FIG. 5, the lid body 24 of the holder 22 is rotated a predetermined number of times with respect to the cylinder body, the bellows tube 21 is contracted, and the optical fiber bundle 7 is moved toward the distal end of the catheter tube. Move it a predetermined distance.

In this case, since the bellows tube 21 is of a closed type, leakage of the liquid and the like is more reliably prevented, and it is also advantageous for maintaining a sterile state.

Further, with this operating tool 17, the moving distance of the optical fiber bundle 7 can be finely adjusted by adjusting the amount of rotation of the lid body 24, and the positioning at the optimum observation area can be easily and reliably performed.

In the above explanation, we have described the case where the inside of a blood vessel is observed using light transmitting and light receiving fibers.
The use of the catheter tube 1 of the present invention is not limited to this, but can be applied to a wide range of fields, such as administration of drug solutions, irradiation of laser beams through optical fibers, and tip guidance when inserting into a target site. .

<Example> (Example 1) Catheter tubes having the structures shown in FIGS. 1, 2, 3, and 4 were created. The conditions of this catheter tube are as follows.

<Tube body> Material: PVC with X-ray contrast agent Outer diameter: Approx. 2.5 mm Total length: Approx. 1.5 m Lumen: 1 lumen for spouting 3-lumen transparent liquid, 1 lumen for storing fibers (inner diameter 1.2 mm), balloon 1 lumen for expansion, lumen storage: Image fiber (approximately 2000 quartz fibers of approximately 2 to 3 μm bundled) and light guide (approximately 25 quartz fibers of approximately 50 μm bundled) are integrated and removed. One optical fiber bundle with a diameter of approximately 0.8 mmφ was used.

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

<Balloon> Material: Latex rubber Thickness: Approximately 150μm Shape: Cylindrical Effective length: 7mm Diameter when inflated: 6mm Installation method: Tighten with thread to the tube body <Catheter tube proximal end> Operating means/As shown in Figure 3 Structure Cylindrical female connector overall length: 40mm Inner diameter: 7.8mm Piston-shaped male connector overall length: 40mm Outer diameter: 7.2mm Sealing member Silicone rubber ring (glued to male connector) Outer diameter: 8.0mm, Inner diameter: 7.0mm Movement Range: 30mm An eyepiece was attached to the base end of the image fiber via an image connector 91 to enable direct observation. A light connector 81 was attached to the base end of the light guide and connected to a white light source.
A stopcock (flush connector 25) with a Luer taper socket is attached to the proximal end of the tube connected to the transparent liquid ejection lumen, and syringe A is connected to this so that saline can be supplied to the lumen. A valve (balloon connector 26) with a Luer taper socket is attached to the proximal end of the tube connected to the lumen that communicates with the balloon, and syringe B is connected to this to inflate the balloon with fluid (physiological saline). was made injectable. Such a catheter tube was inserted into a blood vessel having an inner diameter of about 5 mm with the distal end of the optical fiber bundle retracted into the lumen. First, syringe B was manually operated to inflate the balloon, fixing the catheter tube to the blood vessel and blocking the blood flow.

Next, syringe A was operated to inject 1.5 ml of physiological saline into the blood vessel, and the balloon was inflated to fix the catheter tube to the blood vessel and block the blood flow.

The blood vessel in front of the balloon was filled with physiological saline.

Next, operate the male connector of the operating means to move the optical fiber bundle to the distal end of the catheter tube.
It was moved 1.5 cm so that the tip of the optical fiber bundle protruded about 1 cm from the tip opening of the lumen.

In this state, when the inner wall surface of the blood vessel was observed through the eyepiece or on the video monitor screen, clear observation was possible without blood flowing into the observed area.

<Effects of the Invention> According to the catheter tube of the present invention, an operating tool is provided for moving an observation instrument such as an optical fiber bundle in the axial direction of the tube body and fixing the optical fiber bundle at a required position with respect to the tube body.
When the catheter tube is inserted into the body cavity, the distal end of the optical fiber bundle is retracted into the lumen, and during observation, it is projected to the outside of the lumen by a predetermined length, so that the distal end of the optical fiber bundle is This prevents scratches on the lens and allows for clear, wide-field observations.

In addition, in the present invention, the observation instrument is fixed by the operating tool on the proximal end of the catheter tube, so the optical fiber bundle can be easily moved to an appropriate position, and the optical fiber bundle can be easily bent or damaged. In addition, unlike the conventional method, the adhesive for fixing the optical fiber does not adhere to the optical fiber tip surface, which is the light-receiving surface, thereby reducing the clarity of the observed image.

Furthermore, with the catheter tube of the present invention, when changing the observation site (in the longitudinal direction of the body cavity), there is no need to move the catheter tube itself, which requires complicated work, and it is only necessary to move the observation instrument using the operating tool. , the observation site, etc. can be changed with extremely simple work.

[Brief explanation of drawings]

FIG. 1 is a side view showing an example of the configuration of the catheter tube of the present invention. FIG. 2 is a partial vertical sectional view showing an example of the configuration of the distal end side of the catheter tube of the present invention. FIG. 3 is a sectional view taken along the - line in FIG. 2. FIGS. 4 and 5 are partial longitudinal sectional views showing examples of the configuration of the proximal end of the catheter tube of the present invention, respectively. 6, 7, and 8 are partially sectional side views showing examples of use of the catheter tube of the present invention, respectively. Explanation of symbols, 1...catheter tube, 2...
...Tube body, 3...First lumen, 31...
Tip opening, 4... second lumen, 41... opening,
5... Third lumen, 6... Balloon, 7... Optical fiber bundle, 71... Tip, 8... Light transmitting fiber (light guide), 81... Light connector, 9... Light receiving fiber ( image fiber), 91... image connector, 10... base end side, 11, 12, 13... tube, 14...
T-tube, 15...Fluid injection connector, 16...
Connector tube, 17... Operating tool, 18... Female connector, 181... Inner surface, 19... Male connector, 191... Operating flange, 20... Seal member, 21... Bellows tube, 211... Proximal end, 2
12...Tip part, 22...Holder, 23...Cylinder body, 231...Female thread, 24...Lid body, 241...
...Male thread, 25...Flash connector, 26...
... Balloon connector, 27... Blood vessel, 271...
Inner wall surface, 28...blood, 29...transparent liquid.

Claims (1)

[Scope of Claims] 1. A catheter tube used by being inserted into a body cavity, comprising: a tube body; and at least one tube disposed around the outer peripheral wall of the tube in the vicinity of the distal end of the tube body, which is freely inflatable and deflated.
a balloon; first and second lumens formed in the tube body and open to the tip of the tube body; a third lumen formed in the tube body and communicating with the inside of the balloon; and housed in the first lumen. an observation instrument for observing the inside of the body cavity, installed on the proximal end side of the catheter tube,
an operating tool for moving the observation instrument in the axial direction of the tube body and fixing the observation instrument at a predetermined position with respect to the tube body, the operation tool communicating with the proximal end of the first lumen. a cylindrical female connector that is fluid-tightly connected to the female connector; and the observation instrument is inserted into the inner cylinder of the female connector through a sealing member that can hold the inner cylinder liquid-tightly, and the observation instrument is fixed thereto. and a piston-shaped male connector. 2. The observation instrument is a bundle of optical fibers,
Claim 1: The inner diameter of the first lumen is 1.1 to 3.0 times the outer diameter of the bundle of optical fibers.
Catheter tube as described in section. 3. The catheter tube according to claim 1 or 2, wherein the surface of the optical fiber bundle and/or the inner surface of the first lumen are lubricated. 4. The movement range of the operating tool is from a protected position inside the first lumen to a position where the distal end of the observation instrument protrudes from a distal opening of the first lumen by 0 to 20 mm. Third
The catheter tube according to any of paragraphs. 5. The catheter tube according to any one of claims 1 to 4, wherein the balloon has a minimum diameter when inflated that is approximately equal to or greater than the maximum internal diameter of the body cavity into which it is inserted. 6 A catheter tube used by being inserted into a body cavity, comprising: a tube body; and at least one inflatable and deflated catheter tube installed around the outer peripheral wall of the tube near the distal end of the tube body;
a balloon; first and second lumens formed in the tube body and open to the tip of the tube body; a third lumen formed in the tube body and communicating with the inside of the balloon; and housed in the first lumen. an observation instrument for observing the inside of the body cavity, installed on the proximal end side of the catheter tube,
an operating tool for moving the observation instrument in the axial direction of the tube body and fixing the observation instrument at a predetermined position with respect to the tube body, the operation tool communicating with the proximal end of the first lumen. A device consisting of a sealed bellows tube that is connected in a fluid-tight manner and has the observation instrument fixed to its base end, and a holder that accommodates the bellows tube and can regulate the degree of expansion and contraction of the bellows tube. A catheter tube characterized in that: 7. The observation instrument is a bundle of optical fibers,
Claim 6: The inner diameter of the first lumen is 1.1 to 3.0 times the outer diameter of the bundle of optical fibers.
Catheter tube as described in section. 8. The catheter tube according to claim 6 or 7, wherein the surface of the optical fiber bundle and/or the inner surface of the first lumen are lubricated. 9. The movement range of the operating tool is from a protected position inside the first lumen to a position where the distal end of the observation instrument protrudes from a distal opening of the first lumen by 0 to 20 mm. 8th
The catheter tube according to any of paragraphs. 10. The catheter tube according to any one of claims 6 to 9, wherein the balloon has a minimum diameter when inflated that is approximately equal to or larger than the maximum inner diameter of the body cavity into which it is inserted.