JPH0780079A - Catheter tube with swing mechanism - Google Patents

Abstract

(57) [Abstract] [Problem] The present invention has a swing mechanism having a simple structure, in which the direction of the tip portion can be changed to an arbitrary direction by a simple operation, and the structure can be easily reduced in size. It is intended to provide a catheter tube. [Structure] The present invention is directed to a resin-made tubular guiding middle portion 12
And a resin tube-shaped bent portion 11 connected to the tip of the guiding middle portion 12, and the guiding middle portion 12 and the bending portion 11 are provided.
Is provided with a through hole 13 penetrating and communicating with the central portions thereof, and on the peripheral wall of the guiding middle portion 12 and the peripheral wall of the bent portion 11,
At least one insertion hole that penetrates the guiding middle portion 12 and the bent portion 11 and is communicated with each other is formed, and the traction wire 16 is inserted through the insertion hole, and a part of the traction wire 16 is a tip portion of the bent portion 11. Is fixed to the bent portion 11 and the other portion of the pulling wire 16 is extended from the rear end of the guiding middle portion 12.

Description

Detailed Description of the Invention

[0001]

[Industrial applications]

The present invention provides medical diagnosis, treatment, etc.
In particular, the present invention relates to a catheter with a swing mechanism used for contrast enhancement and for guiding a small-diameter endoscope.

[0003]

2. Description of the Related Art Recently, medical endoscopic catheters have made remarkable progress and have come to play a major role in the diagnosis and treatment of diseases in the digestive organs and blood vessels. In particular, when the endoscopic catheter is inserted into a narrow tube of a blood vessel or a pancreatic duct for observation or treatment, the thinness of the endoscope catheter used and a catheter that does not impair the thinness of the catheter. A tip bending mechanism is required. In this type of catheter, a catheter tube accommodating the endoscope main body is a resin-made tubular thin tube having one or more insertion holes called a lumen, and is used for diagnosis or treatment through the insertion hole. It is a medical device that can perform. That is, a catheter tube is prepared by injecting a drug solution or a contrast agent into the body through an insertion hole of the catheter tube after inserting the catheter tube into a necessary portion of the body or using a catheter having a balloon to perform PTCA (percutaneous coronary dilatation). ), And more recently, an outer diameter of 1 m
It is used for the purpose of observing a target site in the body by inserting an endoscope main body having an ultra-fine diameter of m or less into a target site in the body through an insertion hole of a catheter tube.

However, the lumen of the body into which the catheter tube is inserted is often intricately complicated, and it is difficult to accurately guide the distal end portion of the catheter tube to a target site in the body. There are many things.
Therefore, in the conventional catheter tube, in order to change the direction of the distal end portion of the catheter tube, a guide wire 1 having a bent tip as shown in FIG. 3 (a) is inserted into the insertion hole 2a of the catheter tube 2, As shown in b), the direction of the distal end portion 2b of the catheter tube 2 is changed by the distal end portion of the guide wire 1. The guide wire 1 is formed by bending the tip of a metal wire having a certain degree of rigidity by plastically deforming it by a predetermined angle, and a soft catheter tube 2 having almost no rigidity is provided with such a guide. By inserting the wire 2, the direction of the tip portion of the catheter tube 2 can be changed.

[0005]

However, although the direction of the catheter tube 2 can be temporarily changed by such a method, the direction of the distal end portion of the catheter tube 2 cannot be freely changed any number of times. Absent. Therefore, when it becomes necessary to change the direction of the catheter tube 2 a plurality of times, it is necessary to prepare a guide wire having a different bending condition each time the direction is changed, replace the guide wire, or use the guide wire properly. There is a problem that it is extremely inconvenient to put in and take out the guide wire. In addition, when the guide wire 1 that has been bent in advance is inserted into the catheter tube 2 and the direction is changed, depending on the insertion direction or the insertion angle of the guide wire 1, the catheter tube 2 cannot be accurately changed to the desired direction. In addition, there is a drawback that the bending angle by the guide wire is remarkably inferior at that time.

The present invention has been made in view of the above circumstances, and has a simple structure in which the direction of the tip portion can be changed to an arbitrary direction by a simple operation, and the structure can be easily reduced in size. An object is to provide a catheter tube with a swing mechanism.

[0007]

In order to solve the above-mentioned problems, a resin-made tube-shaped guiding center portion and a resin-made tube-shaped bending portion connected to a tip of the guiding center portion are provided. And a through hole that penetrates through the central portions of the guiding middle portion and the bending portion to communicate with each other, and communicates through the guiding middle portion and the bending portion to the peripheral wall of the guiding middle portion and the circumferential wall of the bending portion. One or more inserted through holes are formed, and a pulling wire is inserted through the through hole to fix a part of the pulling wire to the bent portion at the tip of the bent portion, and the other portion of the pulling wire to the guiding middle portion. It comes out from the rear end.

According to a second aspect of the present invention, in order to solve the above problems, in the catheter tube with a swing mechanism according to the first aspect, the resin forming the bent portion is made softer than the resin forming the guiding middle portion. It will be.

[0009] In order to solve the above-mentioned problems, the invention according to claim 3 is the catheter tube with a swing mechanism according to claim 1 or 2, wherein the bent portion is provided on the outer periphery of the portion where the pulling wire is inserted in the peripheral wall of the bent portion. The groove is formed to enhance the flexibility of the.

[0010]

The function of the distal end portion of the catheter tube can be changed by pulling the pulling wire that is pulled out from the rear end of the guiding middle portion of the catheter tube. Further, since the size of the bending angle when changing the direction of the catheter tube can be increased or decreased in proportion to the size of the pulling amount of the pulling wire, the bending angle of the catheter tube can be adjusted to a desired bending angle. Since the direction of the catheter tube can be controlled with a simple structure, the direction can be controlled without complicating the structure of the catheter tube, which contributes to downsizing and weight saving of the catheter tube.

Further, if the bent portion of the catheter tube is made of a resin softer than the guiding middle portion, when the user pulls the pulling wire, only the bent portion can be easily bent, so that the bending operation can be performed. You can easily. Furthermore, if a groove is formed on the outer peripheral side of the peripheral wall portion of the bent portion through which the pulling wire is inserted, the bent portion easily bends with this groove as a boundary, so that the direction of the distal end portion of the catheter tube is changed. Is easily done.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 2 and 3 show an embodiment of the catheter tube according to the present invention. A catheter tube 10 of this example includes a bent portion 11 that constitutes a distal end portion thereof, and a guiding middle portion 12 that follows the bent portion 11. It is mainly composed of. The bent portion 11 and the guiding middle portion 12 are both made of a resin tube having the same outer diameter, but the resin material forming the bending portion 11 is made of a soft resin material such as urethane resin to form the guiding middle portion 12. The resin material to be used is made of a resin material such as FEP which is harder than the resin material forming the bent portion 11.
A through hole 13 is formed in each of the bent portion 11 and the guiding middle portion 12 so as to penetrate through the central portions thereof, and the peripheral wall of the bent portion 11 and the guiding wall portion 12 are separated from the tip of the bent portion 11. The insertion holes 14 are arranged at symmetrical positions such that the through holes 13 are sandwiched at 180 ° intervals so as to reach the rear end of the guiding middle portion 12.
15 is formed.

A pulling wire 16 is inserted through these insertion holes 14 and 15. This traction wire 16 has 2
It is provided by inserting the folded-back portion to the tip end side of the bent portion 11 and inserting the other portions into the insertion holes 14 and 15. Then, the folded-back portion of the pulling wire 16 extending to the tip end surface side of the bent portion 11 is extended in a semicircular arc shape along the tip end surface of the bent portion 11 and fixed to the tip end surface 11 of the bent portion 11 with an adhesive. ing. In addition, the portions on both end sides of the pulling wire 16 are respectively projected from the respective insertion holes on the rear end side of the guiding middle portion 12 by a predetermined length. Further, the pulling wire 16 taken out from the guiding middle portion 12 is wound around a winding drum (not shown), and the pulling wire can be pulled or loosened by rotating the winding drum. ing. Furthermore, in the outer peripheral side of the portion of the bent portion 11 through which the pulling wire 16 is inserted, that is, in the upper and lower portions of the bent portion 11 shown in FIGS. 2A and 2B, the longitudinal direction of the bent portion 11 A plurality of grooves 17 are formed along the line.

An outer cover 20 is provided on the outer peripheral side of the bent portion 11 and the guiding middle portion 12 to cover them, and the tip end cap 2 with a tip hole is provided outside the outer cover 20 at the tip of the bent portion 11.
1 is attached, and a connecting ring 22 is attached to the boundary portion between the bent portion 11 and the guiding middle portion 12, and the guiding middle portion 1 is further attached.
A fixing ring 23 is attached to the rear end of the second member 2. The bent portion 11 and the guiding middle portion 12 have their insertion holes 14 and 1 respectively.
Adhered in the state of 5 alignment,
The distal end cap 21, the connecting ring 22, and the fixing ring 22 are bonded and integrated with the bent portion 11 or the guiding middle portion 12, respectively, to form the catheter tube 10. By the way, when the catheter tube 10 having the above-mentioned configuration is applied as a general catheter tube, for example, the bent portion 11 has a length of about 2 to 4 cm, and the groove 1
The width of 7 can be formed to about 1 mm.

Next, a method of using the catheter tube 10 having the above structure will be described. Like the conventional catheter tube, the catheter tube 10 is inserted into the inside of the human body or the like to inject the medical solution or the contrast agent into the body through the through hole 13, or the catheter tube 10. PTC with a balloon at the tip of
It is used for performing A (percutaneous coronary dilation).

In order to insert the catheter tube 10 into a predetermined part in the body, it may be necessary to change the direction of the tip of the catheter tube 10 to a desired direction. In this case, for example, when it is desired to change the direction of the distal end portion of the catheter tube 10 to the diagonally upper side of FIG. 1, the upper side of FIG. 1 among the index wires 16 and 16 that are extended from the rear end of the catheter tube 10. The pulling wire 16 is pulled to the front side of the user by a winding drum or the like.

In this operation, the catheter tube 1
The central portion of the pulling wire 16 located on the distal end side of 0 is bonded to the distal end surface of the bent portion 11, and since the bent portion 11 is made of a soft resin material, the bent portion 11 of the catheter tube 10
Easily bends upwards. Further, the bent portion 11 is made of a resin material softer than the guiding middle portion 12, and the groove 17 is formed on the outer peripheral portion of the bent portion 11, so that the bent portion 11 is easily bent in the forming direction of the groove 17. When the pulling wire 16 is pulled, the bending portion 11 is preferentially and easily bent.

In the above operation, the pulling wire 1
If the pulling amount of 6 is increased, the catheter tube 1
The bending angle of the bending portion 11 of 0 can be increased, and the bending angle of the bending portion 11 of the catheter tube 10 can be decreased by reducing the amount of tension. If the pulling of the pulling wire 16 is stopped, the bending portion 11 returns to a straight line due to the elasticity of the bending portion 11, and the pulling wire 16 is pulled back to the inside of the catheter tube 10, so that the direction control of the tip portion of the catheter tube 10 is performed. Can be canceled.

By the way, in FIG. 1, when it is desired to direct the tip of the catheter tube 10 to the lower side, the lower pulling wire 16 may be pulled to the front side of the user using a winding drum or the like. Further, in FIG. 1, when it is desired to direct the tip of the catheter tube 10 to the front side of the paper surface or the back side of the paper surface, the catheter tube 10 in the state shown in FIG. After rotating 90 degrees or 270 degrees, either of the two pulling wires 16 may be pulled to the front side of the user. By appropriately selecting the above operation, the distal end portion of the catheter tube 10 can be oriented in any desired direction.

If the catheter tube 10 having the above structure is used as described above, the catheter tube 10
Since the direction of the tip of the catheter tube can be easily changed to a desired direction, the usability of the catheter tube is significantly improved when the catheter tube 10 is inserted into the cavity inside the human body. Further, in the catheter tube 10 having the above-mentioned structure, the internal structure is extremely simple even though the direction changing function of the distal end portion is added, and it does not hinder the reduction in size and weight of the catheter tube 10. Compact, lightweight and easy to reduce diameter.

By the way, in the above-mentioned embodiment, the configuration in which the catheter tube 10 is provided with two insertion holes is disclosed. However, if the number of the insertion holes through which the pulling wire 16 is inserted is one or more, three or four may be used. One is okay. When both the insertion hole and the pulling wire are provided, the pulling operation of one pulling wire may be performed after rotating the catheter tube 10 by a desired angle, and three or four pulling wires may be used.
When one insertion hole and the pulling wire are provided, the tip portion of the catheter tube 10 can be turned in a plurality of directions without rotating the catheter tube 10.

In the cartel tube 10 shown in FIG. 2, the plurality of grooves 17 formed on the upper and lower surfaces of the bent portion 11 are formed alternately. Thus groove 1
By forming 7 alternately, the thickness of the catheter tube 10 can be made thinner. Here, the bent portion 11
If grooves are formed at the same position on the upper and lower parts of the surface, the catheter tube is likely to buckle and the strength becomes weak.

[0023]

As described above, according to the present invention, the distal end portion of the catheter tube can be bent by pulling the pulling wire extending from the rear end side of the catheter tube. Further, since the bending angle of the catheter tube can be increased or decreased in proportion to the pulling amount of the pulling wire, the bending angle of the catheter tube can be adjusted to the bending angle desired by the user. Therefore, after inserting the catheter tube into a necessary part in the body, a drug solution or a contrast agent is injected into the body through the insertion hole of the catheter tube, or PTCA (percutaneous coronary dilatation) is performed using a catheter having a balloon. In addition, when an endoscope with an outer diameter of 1 mm or less is inserted into the target site in the body through the insertion hole of the catheter tube and used for the purpose of observing the target site in the body, etc. Since the direction of the catheter tube can be freely changed, usability is improved and an excellent catheter tube can be provided.

Further, according to the present invention, since the direction of the catheter tube can be controlled with a simple structure, the direction can be controlled without complicating the structure of the catheter tube, which contributes to downsizing and weight saving of the catheter tube. Furthermore, if the bent portion is made of a resin material that is softer than the guiding middle portion, only the bent portion can be easily bent when the pulling wire is pulled, so that the bending operation can be facilitated.

Furthermore, if a groove is formed on the outer peripheral side of the bent portion through which the pulling wire is inserted, the bent portion is easily bent at this groove as a boundary, so that the direction of the tip of the catheter tube can be easily changed. You can

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a catheter tube according to the present invention.

2 (a) is a partial cross-sectional view showing the distal end portion of the catheter tube shown in FIG. 1, and FIG. 2 (b) is a front view showing the distal end portion of the catheter tube.

FIG. 3 (a) is a perspective view showing an example of a conventional catheter tube and an example of a guide wire, and FIG. 3 (b) shows a state in which the orientation of the distal end portion of the catheter tube is changed by the guide wire. It is a perspective view.

[Explanation of symbols]

10 ... Catheter tube, 11 ... Bending part, 12 ... Guide part, 13 ... Through hole, 14 ... Insertion hole, 15 ...
Insertion hole, 16 ... Traction wire, 17 ...
・ Groove, 20 ... Jacket, 21 ...
Tip cap, 22 ... Connection ring, 2
3 ... Fixing ring,

Claims (3)

[Claims] 1. A resin-made tube-shaped guiding center portion and a resin-made tube-shaped bending portion connected to a tip of the guiding middle portion, and the resin guiding tube-shaped bending portion penetrating through the central portions thereof. A communicating through hole is provided, and at least one through hole that penetrates through the guiding middle portion and the bending portion is formed in the peripheral wall of the guiding middle portion and the peripheral wall of the bending portion, and the drawing hole is pulled. A catheter with a swing mechanism, in which a wire is inserted and a part of the pulling wire is fixed to the bending portion at the tip of the bending portion, and the other portion of the pulling wire is taken out from the rear end of the guiding middle portion. tube. 2. The catheter tube with a swing mechanism according to claim 1, wherein the resin forming the bent portion is made softer than the resin forming the guiding middle portion. . 3. The catheter tube with a swing mechanism according to claim 1 or 2, wherein at least one groove for enhancing the flexibility of the bent portion is provided on the outer circumference of the portion of the peripheral wall of the bent portion where the pulling wire is inserted. A catheter tube with a swing mechanism characterized by being formed.