JP2003111846A - Catheter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a catheter being excellent in appearance and easy to manufacture, while preventing damage to the inner surface of a living body due to a stepped level in the portion of a cuff fixed to the catheter body, and preventing waste from collecting in the fixed portion. SOLUTION: In the catheter 11, the cuff 14 is fixed to the outer peripheral surface of an outer tube 12 serving as the catheter body, and has a front end side fixed portion 14b and a rear end side fixed portion 14a positioned closer to the rear end of the outer tube than the front end side fixed portion. The rear end side fixed portion 14a is fixed to the outer peripheral surface of the outer tube 12 and is folded back so that it is concealed within the cuff 14. The front end side fixed portion 14b of the cuff folded is fixed to the outer peripheral surface of the outer tube 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catheter to be inserted into a living body, and more particularly to a catheter having a cuff attached near the tip of a catheter body.

[0002]

2. Description of the Related Art Conventionally, various tubes or catheters to be inserted into the trachea have been developed to secure an airway during general anesthesia during surgery. In the above respiratory management and respiratory management of a patient with impaired consciousness, it is necessary to secure an airway by tracheotomy, and an artificial respirator is also used for a patient with respiratory distress. Training for spontaneous breathing and vocalization is necessary for patients who no longer need artificial respiration.

Therefore, in order to meet the above requirements, a tracheostomy catheter having a double tube structure of an outer tube and an inner tube has been developed. An example of such a tracheostomy catheter will be described with reference to FIG.

FIG. 3 is a sectional view schematically showing a state in which a conventional tracheostomy catheter is left in the trachea. The trachea 1 of the patient is incised, and the tracheostomy catheter 2 is inserted from the incised portion. Tracheostomy catheter 2
Has a curved outer tube 3 and an inner tube 4 inserted into the outer tube 3. A Murphy hole 3a is formed in a portion of the outer tube 3 inserted into the trachea 1. A cuff 5 is fixed near the tip of the outer tube 3. The cuff 5 is made of a stretchable synthetic resin and forms a sealed space on the outer circumference of the outer tube 3. The sealed space in the cuff 5 is connected to the balloon 6, and the balloon 6 can be used to inflate the cuff 5. As a result, the outer peripheral surface of the cuff 5 is pressed against the inner surface of the trachea 1 to prevent air leakage.

The Murphy hole 3a provided in the outer tube 3
Is used for vocal training and the like. That is, the inner tube 4 is removed, the outer end of the outer tube 3 is closed with a finger or the like, and the Murphy hole 3a is provided to allow air to flow from the lungs to the vocal cords through the Murphy hole 3a. There is.

By the way, in the conventional tracheostomy catheter 2, as shown in FIG. 4, the cuff 5 is closely attached to the inner wall 1a of the trachea 1 to prevent air leakage. FIG. 5 shows an enlarged sectional structure of a portion where the cuff 5 is provided. That is, although the cuff 5 is fixed to the outer peripheral surface of the outer tube 4, the cuff 5 is configured by adhering or fusing a stretchable synthetic resin sheet to the outer peripheral surface of the outer tube 3. Therefore, the edge indicated by the arrow A is formed on the front end side portion 5a and the rear end side portion 5b of the cuff 5.

Therefore, the tracheostomy catheter 2 is attached to the trachea 1.
There was a risk that the edge A would damage the inner wall of the trachea 1 when inserting it inside and taking out the tracheostomy catheter 2.
In order to prevent the inner surface of the trachea from being damaged by the edge of the fixed portion of the cuff as described above, various structures have been conventionally proposed.

For example, as shown in FIG. 6, a concave portion 4a is formed in the outer peripheral surface of the outer tube 4 in the circumferential direction, and the base end side portion 5a of the cuff 5 is fixed in the concave portion 4a by adhesion or the like to eliminate a step. The method has been applied.

Further, as shown in FIG. 7, when the cuff 5 is fusion-bonded to the outer peripheral surface of the outer tube 4 at the tip side portion, and when the outer tube 5 is viewed in a longitudinal section, the fusion-bonded portion has a curved shape. Then, a structure for avoiding damage to the trachea at the time of insertion has been proposed (JP-A-8-47537).

[0010]

However, as shown in FIG. 6, in the method of forming the concave portion 4a on the outer peripheral surface of the outer tube 4 and fixing the cuff 5 in the concave portion 4a, the outer tube 4 must be processed. In addition, there is a problem that a gap shown by an arrow B in FIG. 6 is formed and dirt and the like remain in the gap.

On the other hand, as shown in FIG. 7, according to the method of softening the edge by fusion and making the step a curved surface, damage to the inner surface of the trachea can be reduced. However, when the cuff and the outer tube are fixed to each other by fusion bonding, the appearance is not always uniform, the appearance is deteriorated, and complicated processing work is forced.

On the other hand, a method of reducing the above-mentioned step by reducing the wall thickness of the end portion of the cuff 5 can be considered. However, with such a method, a sufficient effect cannot be expected, and a gap is generated in a portion where the cuff 5 is fixed to the outer tube 4, so that dirt may be retained.

Incidentally, not only the tracheostomy catheters shown in FIGS. 3 to 7 but also other catheters having a catheter body provided with a cuff poses a problem.

An object of the present invention is to solve the above-mentioned problems of the conventional catheter, to prevent the living body from being damaged due to the step between the fixed portions of the catheter body and the cuff, to prevent dirt and the like from accumulating in the fixed portions, and An object of the present invention is to provide a catheter that has excellent appearance and can be manufactured without requiring complicated processing work.

[0015]

The present invention is a catheter to be inserted into a living body or the like, which comprises a tubular catheter body and a cuff fixed near the tip of the catheter body, wherein the cuff comprises: Between the distal-side fixed portion fixed near the distal end of the catheter body, the proximal-side fixed portion disposed closer to the proximal end of the catheter body than the distal-side fixed portion, and between the distal-side fixed portion and the proximal-side fixed portion In the cuff, wherein the proximal end side fixed part is fixed to the outer peripheral surface of the catheter main body, and the proximal end side fixed part is fixed to the outer peripheral surface of the catheter body. The cuff is folded back so as to be hidden in, and the tip side fixing portion of the folded cuff is fixed to the outer peripheral surface of the catheter body.

In a specific aspect of the present invention, the cuff is folded back so as to be hidden in the proximal cuff at the proximal side fixing part of the cuff, and the distal side fixing part of the folded cuff is a catheter. It is fixed to the outer peripheral surface of the main body, and the tip of the tip side fixing portion of the cuff is rounded. Therefore, in both cases of inserting and withdrawing the catheter body, it is possible to prevent damage to the inner surface of the trachea.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be clarified by describing specific embodiments of the present invention with reference to the drawings.

1 (a) and 1 (b) are partial cutaway longitudinal sectional views for explaining a method for fixing a cuff to a tracheostomy catheter according to the present invention, and FIG. 2 is a trachea of this embodiment. It is a schematic structure figure showing the whole incision catheter structure.

As shown in FIG. 2, a tracheostomy catheter 1
1 has an outer tube 12 as a catheter body and an inner tube 13. That is, the tracheostomy catheter 11 has a double tube structure.

The outer tube 12 is made of soft vinyl chloride resin and can have a curved shape as shown in the figure. That is, since the outer tube 12 is easily deformed, the outer tube 12 can be easily deformed according to the size of the trachea, the shape and size of the incised portion, and the like when it is inserted into the trachea of a patient. The patient is unlikely to suffer pain when the tracheostomy catheter 11 is inserted.

A Murphy hole 12a is formed as a through hole on the outer peripheral surface of the outer tube 12. Further, a cuff 14 is fixed to the tip 12b side of the outer tube 12. Cuff 14
Has a bulging portion 14c bulged by the introduction of gas, a base end side fixing portion 14a and a tip end side fixing portion 14b. On the other hand, a connector 15 is fixed to the proximal end portion of the outer tube 12 opposite to the distal end 12b.

A feature of the tracheostomy catheter 11 of this embodiment is that the cuff 14 is fixed to the outer peripheral surface of the outer tube 12. Whether the inner diameters of the base end side fixing portion 14a and the tip end side fixing portion 14b of the cuff 14 are equal to the outer diameter of the outer tube 12,
It has been made slightly smaller. When fixing the cuff 14 to the outer tube 12, as shown in FIG. 1A, with the cuff 14 turned upside down, the proximal end side fixing portion 14 a of the cuff 14 is fixed to the outer tube 12.
It is fixed to the outer peripheral surface of using an adhesive. The base end side fixing portion 14a may be fixed to the outer tube 12 by using fusion instead of adhesion.

Next, as shown by the arrow in FIG. 1A, the cuff 14 is folded back, and the tip side fixing portion 14b is fixed to the outer peripheral surface of the outer tube 12 with an adhesive. Therefore, the base end side fixing portion 14a of the cuff 14 is hidden in the cuff 14 by the folding back. Therefore, since there is no step on the base end side of the cuff 14, it is difficult to damage the inner surface of the trachea when the outer tube 12 is pulled out.

The tip of the tip side fixing portion 14b is rounded as shown. Therefore, when the outer tube 12 is inserted into the trachea, the inner surface of the trachea is less likely to be damaged because the tip of the tip-side fixing portion 14b is rounded.

As a material for the cuff 14, a synthetic resin having flexibility can be used, for example, a soft vinyl chloride resin can be used.

Returning to FIG. 2, the inner tube 13 is composed of a curved tubular member. The inner tube 3 is made of, for example, a soft vinyl chloride resin, a silicone resin, or a synthetic resin having excellent flexibility such as polyethylene.

An inner pipe connecting adapter 16 is fixed to the base end portion of the inner pipe 13 opposite to the tip 13a. The inner pipe connecting adapter 16 has a connecting portion 1 whose tip has a relatively small diameter.
6a, and a main body portion 16b having a relatively larger diameter on the base end side than the connection portion 16a. The outer diameter of the connecting portion 16a is selected so as to substantially match the inner diameter of the outer tube 12. That is, the inner pipe 13 is inserted into the outer pipe 12, and the connecting portion 16a is brought into close contact with the inner wall of the outer pipe 12, whereby the inner pipe 13 is fixed to the outer pipe 12.

The inner pipe 13 of this embodiment is used by being inserted into the outer pipe 12. Therefore, when the inner surface of the inner pipe 13 becomes dirty, only the inner pipe 13 can be removed for cleaning.

Further, since it has the double tube structure, it is possible to provide the outer tube 12 with the Murphy hole 12a. Further, the tracheostomy catheter 11 of the present embodiment is provided with the stylet 17. Stylet 17
Has a guide portion 17a having a streamlined shape at its tip.

Although the tracheostomy catheter 11 of the present embodiment has the above-mentioned structure, the present invention has a structure of fixing the cuff 14 to the outer tube 12 and a structure of the cuff 14 itself. The present invention is not particularly limited to the above embodiment. Therefore, the present invention can be applied to a catheter having no inner tube and a catheter inserted into a blood vessel other than the trachea, a urethra, or the like.

[0031]

In the catheter according to the present invention, among the fixing portions of the cuff to the catheter body, the proximal fixing portion is arranged so as to be hidden in the cuff, that is, the proximal fixing portion is fixed to the catheter body. Since the base end side fixed portion is hidden in the cuff by being fixed to the outer peripheral surface of the cuff and then folded back, damage to the living body at the base end side fixed portion of the cuff can be prevented. Therefore, when the catheter body of the catheter is pulled out, it can be pulled out easily without causing pain to the patient.

Further, when the distal end of the distal end side fixing portion is rounded, the living body is less likely to be damaged in both the fixing portions on both sides of the cuff, whereby insertion or withdrawal of the catheter body is prevented. Even in this case, it is possible to prevent damage to the inner surface of the living body.

[Brief description of drawings]

1A and 1B are partial cutaway longitudinal sectional views for explaining fixing a cuff to an outer tube of a tracheostomy catheter according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram for explaining a tracheostomy catheter according to an embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view showing a state where the tracheostomy catheter is easily outflowed.

FIG. 4 is a view showing a relationship between an outer tube and a cuff of a conventional tracheostomy catheter.

FIG. 5 is a partial cutaway sectional view for explaining a portion where a cuff is fixed to an outer tube in a conventional tracheostomy catheter.

FIG. 6 is a partially cutaway sectional view for explaining a portion where a cuff is fixed to an outer tube in a conventional tracheostomy catheter.

FIG. 7 is a partially cutaway sectional view for explaining a portion where a cuff is fixed to an outer tube in a conventional tracheostomy catheter.

[Explanation of symbols]

11 ... Tracheostomy catheter 12 ... Outer tube as catheter body 14 ... Cuff 14a ... Base side fixing part 14b ... Tip side fixing part

Claims (2)

[Claims] 1. A catheter to be inserted into a living body, comprising:
A tubular catheter main body and a cuff fixed near the tip of the catheter main body, the cuff being fixed near the front end of the catheter main body, and a catheter main body rather than the distal end side fixed portion. Of the proximal end side fixed portion disposed near the proximal end, and between the distal end side fixed portion and the proximal end side fixed portion, the bulging portion that bulges away from the outer peripheral surface of the catheter body to the outside, The proximal fixing part is fixed to the outer peripheral surface of the catheter body, the cuff is folded back so that the proximal fixing part is hidden in the cuff, and the distal fixing part of the folded cuff is the catheter body. A catheter characterized in that it is fixed to the outer peripheral surface of the catheter. 2. The catheter according to claim 1, wherein the tip of the tip side fixing portion of the cuff is rounded.