JP3351015B2 - Sliding catheter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding catheter and, more particularly, to a catheter introduced into a body through a guide wire, inserted into a blood vessel or the like via a sheath, and used in an endoscope. The present invention relates to a sliding catheter that is convenient to be inserted and used.

[0002]

2. Description of the Related Art In general, a sliding catheter in which an inner tube and an outer tube of a double-tube structure slide is used to introduce a drug solution, an infusion solution, or the like into a body or to measure a pressure of a body fluid. In this sliding catheter, an inner tube accommodated in an outer tube having a double-tube structure slides so that the tip of the inner tube can protrude from a tip of the outer tube to a predetermined length. Yes, for example
By attaching a balloon to the tip of the inner tube to expand and close the body tube, or by attaching a J-shaped bending habit to the tip of the inner tube and moving or rotating the hub at the base end of the inner tube, By changing the direction of the tip of the inner tube back and forth, the catheter can be guided in a predetermined direction, an infusion solution can be introduced, or the pressure can be measured. Since the conventional sliding catheter uses resin tubes for the outer tube and the inner tube, an inner tube having a large diameter is required to maintain the stiffness of the inner tube. For this reason, it is difficult to insert the sliding catheter and to insert it into a thin sheath and an endoscope. In addition, even if the hub on the outside of the body of the resin-made inner tube is operated, the transmission of the operation is poor at the distal end, and especially in the case of a small-diameter inner tube, the rotation followability (torque transmission) is quite poor. Even when the hub of the inner pipe is rotated, the tip does not follow and does not rotate, and the follow-up of the rotation slowly appears with a timing shift, so that the installation direction of the tip of the inner pipe changes with time.

[0003]

SUMMARY OF THE INVENTION According to the present invention, the insertion is convenient, the position of the distal end of the inner tube can be easily controlled by operating the proximal portion at hand, and the operation of the balloon, the injection of the introduction liquid and the pressure measurement can be performed. It is an object of the present invention to provide an easy sliding catheter.

[0004]

Means for Solving the Problems The present inventors have made at least a fixed length of the inner tube of a sliding catheter at least at a proximal side of a metal such as stainless steel to facilitate sliding. And improved the operability of the sliding catheter by improving the followability of the distal end to the operation of the hub at hand. That is, the present invention consists of the following items. (1) A sliding catheter having a slidable double tube structure composed of an inner tube and an outer tube, wherein a tip of the inner tube projects from the tip of the outer tube by a predetermined length. At least a certain length on the proximal side is made of metal, one end of the balloon tube is fixed to the end of the inner tube, the other end of the balloon tube is fixed to the end of the outer tube, and the sliding catheter is A sliding catheter, wherein a scale of a relative interval and a scale of a relative rotation angle between a proximal end of an outer tube and a proximal end of an inner tube are provided at a base end portion. (2) The sliding catheter according to (1), wherein at least a predetermined length of the inner tube is a tube made of a superelastic alloy. (3) The sliding catheter according to (1) or (2), wherein the distal end of the inner tube is bent. (4) The sliding catheter according to any one of (1), (2) and (3), wherein a soft resin tube is extended at the tip of the inner tube.

The sliding catheter of the present invention is characterized in that a metal, particularly a superelastic alloy, is used for the inner tube. However, an amorphous metal having substantially the same physical properties as the superelastic alloy is used instead of the superelastic alloy. Inner tube tubes can also be used. The following description is made on the inner tube made of a superelastic alloy for simplicity, but the superelastic alloy in the entire description can be replaced with a metal such as stainless steel or an amorphous metal. The sliding catheter of the present invention has an outer tube length of several centimeters to about 120 cm, an inner diameter of 0.3 to 10 mm, usually 0.5 to 4 mm, and a thickness of 0.1 to 0.1 mm.
The present invention can be applied to a sliding catheter of about 2 mm for various known uses without any particular limitation. The outer tube 3 of the sliding catheter of the present invention is a tube made of a synthetic polymer material used in known catheters, for example, nylon, polyamide, polyurethane, polyimide, polyether polyamide, Teflon, and the like. A multilayer tube manufactured by a two-layer co-extruder made of a material and a material having a braiding structure reinforced by winding a wire in the material can be used. An outer tube hub 4 made of metal, glass or resin is connected to the proximal end of the outer tube 3 of the sliding catheter of the present invention. The outer tube hub 4 has a structure to be fitted with the tip of the inner tube hub 2.
The inner tube of the sliding catheter of the present invention comprises an inner tube tube 1 made of metal, especially a superelastic alloy, and an inner tube hub 2 made of metal, glass or resin at the base end. , 0.2-10mm outside diameter, usually 0.4
A hollow tube made of a superelastic alloy having a thickness of 0.05 to 0.3 mm and a thickness of 0.05 to 0.3 mm. The length of the outer tube is set when the inner tube hub 2 and the outer tube hub 4 of the sliding catheter are brought into close contact with each other. The distal end of the inner tube 1 can be protruded from the distal end by a predetermined length, for example, about several centimeters to 30 centimeters.

By using a metal inner tube for the sliding catheter of the present invention, a stiff inner tube can be obtained. Therefore, the diameter of the inner tube can be made smaller than when a resin inner tube is used. The outer diameter of the catheter can be reduced, and the gap between the outer tube and the inner tube can be increased, which is convenient for injecting a liquid or the like. Further, since the inner tube is made of metal, it has a contrast effect on X-rays, and the position of the tip of the inner tube can be grasped by X-rays. The inner tube hub 2 is separated from the outer tube hub 4 at a position where the space between the inner tube hub 2 and the outer tube hub 4 is closely contacted at the proximal end of the sliding catheter of the present invention, and is relatively spaced. Then, the distal end of the inner tube 1 is slid and housed inside the distal end of the outer tube 3. At this time, if a scale capable of indicating the interval between the outer tube hub 4 and the inner tube hub 2 is provided at the base end portion of the sliding catheter, the position of the distal end of the inner tube can be known from the interval between the inner tube hub and the outer tube hub. Can be. Further, by providing a scale indicating the relative angle between the outer pipe hub 4 and the inner pipe hub 2, the direction of the tip of the inner pipe having a bent tip can be known from the scale. The method of attaching the scale can be used without particular limitation as long as the scale can measure the interval and angle between any two hubs. As a method other than the above, for example, the circle of the inner tube 1 and the circle of the outer tube hub 4 can be used. Scale around the outer tube hub 4
By reading the scale on the inner tube 1 which is in contact with the end face of the inner tube, the protrusion length of the inner tube can be known, and the base line and the position of the inner tube 1 can be used to determine the rotation angle with the circumferential scale of the outer tube hub 4. You can know. In addition to the above, the method of setting the scale is to provide a frame between the outer tube hub 4 and the inner tube hub 2 into which a measure extending from the other hub can be inserted, and that the frame extends along the circumference. By making it slidable,
A method of reading the distance and the relative angle between both hubs can also be used. Such a scale at the base end is an effective method only when the inner tube 1 of the present invention is made of a metal, particularly a superelastic alloy, having good rotation followability.

[0007] The inner tube used in the present invention is made of a metal, especially a superelastic alloy, so that when the sliding catheter is inserted, it also serves as a stylet as a core. As the metal used for the inner tube of the sliding catheter of the present invention, stainless steel or a superelastic alloy is preferably used. As the superelastic alloy, for example, a Ni-Ti alloy, a Ni-Ti-X type alloy, particularly a Ni-Ti-Co alloy , Au-Cd alloy,
Cu-Zn-X alloy (X = Si, Sn, Al, Ga),
Cu-Al-Ni alloy, Ni-Al alloy, In-Tl alloy, Au-Cu alloy, Au-Cu-Zn alloy, Fe-C
A Ni-Ti alloy or the like mixed in a specific ratio can be used, and a Ni-Ti alloy is desirable in that the transformation point can be easily adjusted, and an alloy in which Co is added to this is particularly desirable. Since the inner tube 1 made of a superelastic alloy of the sliding catheter of the present invention is a hollow body, it has a strong stiffness in spite of its light weight and also plays a role as a mandrel of the outer tube 3, and it is broken because it is a superelastic body. This is advantageous because there is little danger that the tip of the inner tube protruding from the outer tube 3 is broken and is left in the body. Although the sliding catheter of the present invention has a slidable double-tube structure, it is also possible to make the inner diameter of the outer tube and the outer diameter of the inner tube almost the same so as to make close contact sliding between the two tubes. There is a gap between the heavy tubes, through which other fluid can be supplied. Also, when inserting the sliding catheter of the present invention,
A guide wire can be passed through the inner tube 1 and inserted deep into the body with the aid of the guide wire.

When a balloon is attached to the tip of the inner tube of the sliding catheter of the present invention, the inner tube 1
Fix one end of the balloon tube 13 to the tip of
The other end can be fixed to the distal end of the outer tube 3. In addition, the present invention attaches a balloon having a diameter of 2 to 4 times as large as the diameter of the catheter to the inner tube and the outer tube, and expands between the ends of the inner tube and the outer tube. Larger balloons can be attached. Conversely, if the size of the inflated balloon is fixed, a catheter that is thinner than the size of the inflated balloon can be used. Therefore, since a sheath having a small diameter for inserting a sliding catheter can be used, scars such as skin and blood vessels due to the sheath can be reduced, and it is also convenient to pass through a narrow endoscope passage. It is. This balloon can be inflated by air or liquid supplied from a gap between the outer tube 3 and the inner tube 1. As the material of the balloon, a known balloon material usually used for a catheter balloon, for example, natural rubber, polyisoprene, silicone rubber, polyurethane or the like can be used. A soft resin tube or a resin cap can be attached to the tip of the inner tube of the present invention so that the tip of the inner tube of the sliding catheter of the present invention does not damage the inner wall of the body tube. When a balloon is attached to the tip of the sliding catheter of the present invention, and the balloon tube is fixed and then inverted as shown in FIG. 4, the balloon tube can also serve the same role as the soft resin tube.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be specifically described with reference to the drawings of the embodiments. As shown in FIG. 1, the sliding catheter of this embodiment comprises an outer tube 3 and an outer tube hub 4 and an inner tube 1 and an inner tube hub 2. Is attached, and a side tube hub 6 is provided at the end. The inner tube 1 of this embodiment is made of a superelastic alloy, and has a curved end at the tip and a stainless steel inner tube hub 2 attached to the other end. Outer tube 3 of this embodiment
The outer tube hub 4 at the base end is made of stainless steel, and can be fitted to the end of the inner tube 1 in a watertight manner. The method of fitting is not particularly limited, and the male taper 7 of the inner tube hub 2 is fitted to the female taper 8 provided on the outer tube hub 4 of the outer tube 3 by a luer taper method as shown in FIG. They can be connected together. Further, the male taper 9 of the distal end portion 11 of the introduction tube 12 can be further fitted to the female taper 10 attached to the inner tube end portion 2. When both the outer tube hub 4 and the inner tube hub 2 are connected as shown in FIG. 3, the distal end of the inner tube 1 protrudes from the distal end of the outer tube 3 by a predetermined length. Since the tip is bent in a curved shape, the tip of the inner tube changes direction when the inner tube end portion 2 is rotated. When the end 2 of the inner tube in FIG. 1 is separated from the end 4 of the outer tube, the tip of the inner tube is housed in the outer tube 3. As shown in FIG. 2, a scale is printed on the back surface of the inner tube 1 near the inner tube hub 2, and the plastic film has a center point 20, a center line 21 and a center line 2 on the back surface.
A scale is printed along the top 1 and a scale 22 having an angle of 0 to 360 ° is engraved on the circumferential surface of the outer tube end portion 4.

When the end of the outer tube hub 4 is located at the midpoint 20 of the scale, the tip of the inner tube 1 is
Matches the tip of When the midpoint 20 is pulled out as shown in FIG. 2, the tip of the inner tube 1 enters the tip of the outer tube 3. Conversely, when the midpoint 20 enters the outer tube hub 4, the distal end of the inner tube 1 protrudes from the distal end of the outer tube 3 by that distance. Further, when the inner pipe hub 2 is rotated, the center line 21 rotates, and the rotation angle can be read at the angle stamped on the circumference of the outer pipe hub 4. This makes it easier to adjust the direction of the tip of the inner tube. In the sliding catheter of the present invention, since the inner tube 1 is made of a superelastic alloy, the tip of the inner tube moves following the insertion / removal and rotation operations of the distal end portion 2, so that the control operation of the tip can be performed accurately. It will be easier. The inner pipe made of resin does not have such a follow-up property, and in particular, the follow-up property with respect to rotation is significantly reduced. In the sliding catheter of this embodiment, a liquid or a gas can be introduced into or discharged from the body via the side tube 5 or the inner tube 1.
The embodiment of FIG. 4 is a preferred use of the present invention. The tip 14 of the balloon rubber tube 13 is fixed to the tip of the inner tube of the embodiment of FIG. 1, the rubber tube is turned over, and the other end of the balloon tube 13 is fixed to the tip of the outer tube 3. I do. The fixing method is not particularly limited. For example, it is possible to wrap an extra-fine thread in multiple layers and use an adhesive together to fix (not shown in the figure).

The embodiment of FIG.
At one end of the outer tube 3, a balloon tube having a diameter larger than that of the case where the balloon is attached to the inner diameter can be used twice or more, usually three times or more as compared with the case where it is attached to the inner diameter.
As a result, the size of the balloon when inflated is more than doubled, and the applications and usage methods are expanded. In fact, if both ends of the balloon tube are fixed to the tip of the inner tube and the middle of the inner tube several centimeters before the tip, when the near-fixed part of the inner tube having a deflated large-diameter balloon is stored. The balloon fixing portion has a rubber film of 2
Due to the overlap, the front tube is caught by the distal end of the outer tube, and the front fixed portion of the inner tube with balloon 1 cannot be stored in the distal end of the outer tube. However, when one end is fixed to the distal end of the outer tube 3 as shown in FIG. 4, the fixed portion at the front disappears and the balloon tube 13 is smoothly housed in the outer tube 3 as shown in FIG. You. The fixed portion at the tip is hardly caught in the outer tube 3 when it enters the outer tube 3 and has a single rubber film, so that a balloon tube having a large diameter can be stored. As shown in FIG. 3, the opening of the outer tube hub 4 is provided with a taper 8.
Of the inner pipe hub 2 can be airtightly connected to the taper 10 of the inner pipe hub.
As described above, when the inner tube hub and the outer tube hub are fitted in an airtight manner and the inner tube tube and the inner surface of the outer tube hub are slid in an airtight manner, the side tube 5 side By injecting air from the tube hub 6, the balloon can be inflated. The tapered structure used for connection in the embodiment of the present invention includes:
A taper structure made of resin, metal, or glass can be used. By simply changing the conduit connected to the inner tube hub 2, it is possible to easily perform the operation of introducing various medical solutions and infusions and the measurement of the body fluid pressure.

[0012]

According to the sliding catheter of the present invention, since the inner tube is made of a metal such as a superelastic alloy, it is possible to reduce the diameter of the inner tube which is required to have a stiffness, thereby reducing the diameter of the outer tube. It is easy to insert into a thin sheath or endoscope, and it can follow the rotation when controlling the distal end of the inner tube by operating the inner tube hub at the base end despite the thin inner tube. It has the advantage of being able to easily inject liquid, measure pressure, inflate the balloon, etc.In addition, the inner tube made of metal, especially superelastic alloy, is used as the core of a thin catheter. There is also an advantage that the insertion operation is facilitated.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a catheter body used in an embodiment of the present invention.

FIG. 2 is a side view of a proximal end portion of the sliding catheter according to the embodiment of the present invention.

FIG. 3 is a sectional view of a distal end portion of an introduction tube connected to a sliding catheter according to an embodiment of the present invention.

FIG. 4 is a sectional view of a sliding catheter with a balloon according to an embodiment of the present invention.

FIG. 5 is a sectional view showing a state where the inner tube of the embodiment of FIG. 4 is housed in an outer tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 inner tube 2 inner tube hub 3 outer tube 4 outer tube 5 side tube 6 side tube hub 7 inner tube taper 8 outer tube taper 9 introduction tube taper 10 inner tube taper 11 conduit tip 12 conduit 13 balloon tube 14 Balloon inner tube fixing part 15 Balloon outer tube fixing part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A61M 25/00 A61M 25/10

Claims (4)

(57) [Claims] 1. A sliding catheter having a slidable double tube structure comprising an inner tube and an outer tube, wherein a tip of the inner tube projects from the tip of the outer tube by a predetermined length. certain length of at least the proximal side metal der tube tube is, at the tip of the inner tube the tube, the balloon tube
One end of the balloon tube and remove the other end of the balloon tube.
Fixing to the end of the tube tube, sliding catheter
The proximal end of the outer tube and the proximal end of the inner tube
Check that the interval scale and the relative rotation angle scale have been added.
Characteristic sliding catheter. 2. The sliding catheter according to claim 1, wherein at least a certain length of the inner tube at the proximal side is a tube made of a superelastic alloy. 3. The inner tube tube has a bent end.
3. The sliding catheter according to 1 or 2. 4. A soft resin tube is provided at the tip of the inner tube.
The sliding category according to claim 1, 2 or 3, which is extended.
-Tel.