JPH0691004A - Tube for medical treatment and its manufacture - Google Patents

Abstract

PURPOSE:To provide a medical tube and its manufacture, which has excellent workability and does not generate any quality problem and can be simplified facilitywise and whose tip is soft. CONSTITUTION:This medical tube 1 consists of a tube main body 10 and a plastic reinforcement body 20 of a spiral shape which has no compatibility with the tube main body 10 and is embedded into the tube main body 10, and the feature of this medical tube 1 is such that the reinforcement body 20 does not exist at the tip portion 100 of the medical tube 1. As for its manufacture, a tube that is embedded spirally with the plastic reinforcement body 20 having no compatibility with the tube main body 10, is formed, and is cut off at a predetermined length, and then, part of the reinforcement body 20 is pulled out of a tube end portion 18 and cut off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical tube and a manufacturing method thereof, for example, a shaft portion such as an endotracheal tube.

[0002]

2. Description of the Related Art Some medical tubes have a reinforcing body embedded therein to prevent the tube itself from collapsing. Typical examples of the reinforcing body include stainless steel wire and highly rigid plastic. Can be mentioned. And such a reinforcement is helically embedded in the wall of the tube. However, as a medical tube, it is desirable that the above-mentioned reinforcing body is not provided at least in a part of a few centimeters of the distal end that enters the patient's body for safety reasons.

Conventionally, a dipping method, a continuous coating method and the like have been introduced as a method of manufacturing a tube containing a reinforcing body. In these cases, a dipping method is used as a method of forming a portion without a reinforcing body at the end of the tube. In the case of, the length of the spiral reinforcing body is adjusted in advance, and in the case of the continuous coating method, a tube without a reinforcing body is joined to the end after molding and sizing cut (see Japanese Patent Publication No. 60-15339). )
Then, there is a method of performing a step of intermittently winding the reinforcing body after forming the inner layer.

[0004]

However, these conventional techniques have the following problems. That is, in the dipping method, it is easy to form a portion without a reinforcing body, but the workability is poor and the cost is high. In the method of retrofitting a tube without a reinforcing body after continuous coating, there is a possibility that an extra step of retrofitting to the end portion after molding occurs, and quality problems such as detachment of the bonded portion may occur. The method of intermittently performing the reinforcing body winding step after forming the inner layer tube is very difficult to wind intermittently, and there is a possibility that the reinforcing body at the beginning of winding is complicated in terms of equipment. is there.

Therefore, the present invention has been made in view of the above problems, and an object thereof is a medical tube which has good workability and can be simplified in terms of equipment without quality problems. It is to provide a manufacturing method.

[0006]

The above object is a medical tube comprising a tube main body and a spiral plastic reinforcement which is immiscible with the tube main body and is embedded in the tube main body. This is achieved by a medical tube characterized in that the distal end portion of the medical tube does not have the reinforcing body.

Also, a tube in which a reinforcing body made of a plastic which is not compatible with the tube body is embedded in a spiral shape is formed, cut into a predetermined length, and then the reinforcing body is partially pulled out from the end of the tube and cut. It is achieved by a method for producing a medical tube characterized by:

Further, a tube in which a plastic reinforcement which is not compatible with the tube body is embedded in a spiral shape is formed, cut into a predetermined length, and then the reinforcement is cut at a predetermined length from the end of the tube. Then, the method is achieved by a method for manufacturing a medical tube, which is characterized in that the reinforcing body cut out from the end of the tube is pulled out.

[0009]

The medical tube of the present invention includes a tube body and
A medical tube that is incompatible with the tube body and is composed of a spiral plastic reinforcement embedded in the tube body, and the reinforcement is not provided at the tip of the medical tube. The part without body becomes a spiral space and the tip becomes flexible, so it is safe for insertion and placement in tubular organs such as the trachea. Further, since the tip flexible portion is formed integrally with the other portion, there is no quality problem. That is, it is not necessary to confirm the detachment of the bonded portion without attaching the tube without the reinforcing body afterwards, and there is no risk of detachment of the tube without the reinforcing body during use.

Further, in the method for producing a medical tube according to the present invention, a tube in which a plastic reinforcing material which is incompatible with the tube body is embedded in a spiral shape is formed, cut into a predetermined length, and then the tube end portion is formed. Because the reinforcing body is partially pulled out and cut, without using a step of retrofitting a molded article having no reinforcing body or a special technique such as intermittent winding of the reinforcing body,
A part without a reinforcement can be obtained at the tip.

The operation of the present invention will be described below in detail with reference to FIGS. 1 to 3. FIG. 1 is a partial cross-sectional view of a medical tube manufactured by the method for manufacturing a medical tube of the present invention, and FIG. 2 is an explanatory view of the manufacturing method of the present invention.
FIG. 3 is an explanatory diagram as a reference example. The process up to the step of forming a tube in which the reinforcing body is embedded in a spiral shape and cutting it into a predetermined length will be described with reference to the medical tube of FIG.

The medical tube 1 of the present invention is a medical tube 1 comprising a tube body 10 and a spiral plastic reinforcement 20 embedded in the tube body 10 which is incompatible with the tube body 10. The distal end portion 100 of the medical tube 1 is characterized by not having the reinforcing body 20.

First, the inner layer tube 1 sheathed in the core material
The method comprises a step of spirally winding the reinforcing body 20 around 2, and then coating the outer layer 14 so as to cover the entire wound reinforcing body 20. The outer layer 14 may be coated by extrusion or dipping.

As the material of the inner layer tube 12, soft vinyl chloride resin, ethylene-vinyl acetate copolymer, polyurethane, silicone rubber, polyamide elastomer, soft fluororesin and the like can be used. The outer layer 14 to be coated is preferably made of the same material as the inner layer tube 12.

The wall thickness, the outer diameter, and the lumen diameter of the tube body including the inner layer 12 and the outer layer 14 vary depending on the use of the medical tube, but in the case of the endotracheal tube, the wall thickness is
It is about 1.0 to 3.0 mm, and the diameter is 5.0 to 1.
The diameter is about 5.0 mm and the lumen diameter is about 4.0 to 10.0 mm.

When the materials of the inner layer 12 and the outer layer 14 are selected to be the same, they are compatible with each other, and the position of the reinforcing body 20 can be fixed without peeling off both layers.

The reinforcing body 20 has a circular or elliptical cross section, and its diameter (average diameter) is 0.5 to 1.0 mm.
It is preferably about 0.5 to 0.8 mm. The formation pitch of the reinforcing body 20 is 1.0 to 15.0 mm.
It is preferably about 1.5 to 5.0 mm.

As the material of the reinforcing body 20, any plastic may be used as long as it is rigid enough to obtain a sufficient reinforcing effect. For example, polyethylene terephthalate (PE
T), polyesters such as polybutylene terephthalate (PBT), polyethylene, polyolefins such as polypropylene, rigid polyvinyl chloride, polyamide, polystyrene, thermoplastic polyurethane, polycarbonate,
ABS resin, acrylic resin, polymethylmethacrylate (PMMA), polyacetal, polyarylate, polyoxymethylene, high-strength polyvinyl alcohol, fluororesin, polyvinylidene fluoride, ethylene-vinyl acetate saponification, polysulfone, polyethersulfone, polyetherketone, polyphenylene Examples thereof include liquid crystal polymers such as oxide, polyphenylene sulfide, liquid crystal polyarylate, liquid crystal polyester carbonate, liquid crystal polyazomethine, and liquid crystal polyesteramide, or polymer alloys containing them. Among them, the inner layer 1 described above
2 and the outer layer 14 and the reinforcing body 20 are incompatible with each other, inner layer / outer layer: soft vinyl chloride resin-reinforcing body: PET, inner layer / outer layer: soft vinyl chloride resin-reinforcing body: nylon, inner layer: soft vinyl chloride. Resin outer layer: Polyurethane-Reinforcement: PET etc. can be illustrated.

Next, the process of cutting the tube coated with the outer layer 14 into a predetermined length is performed. This also has a different cutting length depending on the application of the medical tube, but it is 2 for the endotracheal tube.
It is about 0 to 50 cm. Since plastic is used for both the inner layer and outer layer reinforcement, cutting is easy and it is suitable for continuous molding. For endotracheal tubes, cut diagonally.

Next, the portion where the reinforcing member does not exist (tip portion 1
00), there are a method shown in FIG. 2 and a method shown in FIG. The method shown in FIG. 2 is a method of pulling out the reinforcing body 20 from the end of the cut surface and cutting it, and the method shown in FIG. 3 cuts (or makes it easy to cut the reinforcing body 20 from the surface of the outer layer 14). Make a cut) and pull out from the end.

Explaining from the method of FIG. 2, the cut end 18 of the tube body 10 has an end 22 of the reinforcing body 20, and the end 22 is pulled out by a predetermined length and cut as shown in FIG. 2B. Cut with tool 30. At this time, since the tube body and the reinforcing body 20 are made of a material having no compatibility, they can be pulled out relatively easily, and the reinforcing body 20 is also easily cut because it is made of plastic. Due to the extension of the reinforcing body 20 and the bending of the tube body 10, the end portion 22 can be fixed with pliers or the like and pulled out. After the cutting, the extension of the reinforcing body 20 and the bending of the tube body 10 are restored, and the cut portion of the reinforcing body 20 returns to the original position to form the tip portion 100 where the reinforcing body 10 does not exist.

In the method shown in FIG. 3, the reinforcing body 20 at a distance where the reinforcing body 10 is not present is previously cut by the cutter 32 into the tube body 1.
The surface is scratched or scratched so that it can be easily cut (Fig. 3 (a)). Next, the end portion 22 of the reinforcement body 10 is fixed with pliers or the like, and the reinforcement body 10 is pulled out (FIG. 3 (b)), whereby the tip portion 100 without the reinforcement body is provided.
Is formed.

[0023]

【Example】

(Example 1) A polyester yarn having a diameter of 0.7 mm was continuously wound around a surface of a soft vinyl chloride resin tube having an outer diameter of 9.0 mm and an inner diameter of 8.0 mm at a pitch of 2.0 mm, and then an inner layer was formed by an extrusion molding machine. An outer layer was covered with the same resin, and a fixed-length cut was performed with a length of 400 mm. It was a tube with a polyester thread reinforcement having an outer diameter of 12.0 mm, an inner diameter of 8.0 mm and a length of 400 mm. After that, the reinforcing body was pulled out and cut by 30 mm from the cut surface of the tube with pliers to form a portion of the tube end having no reinforcing body of about 3.0 mm. Furthermore, by heat-processing that part with a tip-processing die, the edge of the tube end was removed, and a medical tube with a rounded tip and no possibility of protrusion of the reinforcing body was obtained.

(Example 2) The same procedure as in Example 1 was carried out until a tube containing a polyester yarn reinforcing body was obtained, and thereafter, a portion 30 mm from the cross section of the tube was reinforced with an ultrasonic cutter (UCT-100, manufactured by Shimada Rika Co., Ltd.). The body was cut, and the reinforcing body from the cut surface of the tube to the cut portion was pulled out with pliers to form a portion having no reinforcing body of about 3.0 mm at the end of the tube. Furthermore, by heat-processing that part with a tip-processing die, the edge of the tube end was removed, and a medical tube with a rounded tip and no possibility of protrusion of the reinforcing body was obtained.

(Examples 3 and 4) The same as Example 1 except that nylon 6 (Example 3) and nylon 66 (Example 4) were used as the reinforcing members.

(Comparative Example 1) Outer diameter 9.0 mm Inner diameter 8.0 m
0.5m diameter on the surface of soft vinyl chloride resin tube of m
m SUS wire is continuously wound at a pitch of 2.0 mm,
Then, the same resin as the inner layer was coated on the outer layer using an extrusion molding machine, and a fixed-size cut was performed with a length of 400 mm. It is S with an outer diameter of 12.0 mm, an inner diameter of 8.0 mm and a length of 400 mm.
It was a tube containing a US wire reinforcement. Furthermore, the edge of the tube end was removed by thermally processing the cross section of the tube with a tip processing die.

(Comparative Example 2) The same as Comparative Example 1 until obtaining a tube containing a SUS wire reinforcement. After that, an attempt was made to cut the reinforcing body with an ultrasonic cutter at a portion of 30 mm due to the cross section of the tube, but the cutting was impossible.

Using the tubes of Examples 1 to 4 and Comparative Example 1 described above, an insertion experiment was carried out in a trachea model.
Nos. 4 to 4 could be inserted without any problem, but in Comparative Example 1, remarkable protrusion from the tube end of the SUS wire reinforcement was observed during the insertion.

[0029]

As described above in detail, the medical tube of the present invention comprises a tube body and a spiral plastic reinforcing body which is not compatible with the tube body and is embedded in the tube body. A medical tube that does not have the reinforcing body at the distal end of the medical tube, so that the portion without the reinforcing body becomes a spiral space, the distal end becomes flexible, and it is inserted into a tubular organ such as a trachea. It is safe for detention. Further, since the tip flexible portion is formed integrally with the other portion, there is no quality problem. That is, it is not necessary to confirm the detachment of the bonded portion without attaching the tube without the reinforcing body afterwards, and there is no risk of detachment of the tube without the reinforcing body during use.

The crotch, according to the method for producing a medical tube of the present invention, a tube in which a plastic reinforcing material which is incompatible with the tube body is embedded in a spiral shape is formed, cut into a predetermined length, and then the tube end portion is cut. Further, since the reinforcing body is partially pulled out and cut, workability is good, quality problems do not occur, and equipment can be simplified.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a medical tube of the present invention.

FIG. 2 is a diagram showing an outline of a manufacturing method of the present invention.

FIG. 3 is a diagram schematically showing a manufacturing method related to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Medical tube 10 Tube body 12 Inner layer tube 14 Outer layer 18 Cutting end 20 Reinforcement body 100 Tip

Claims (2)

[Claims] 1. A medical tube comprising a tube main body and a spiral plastic reinforcing member which is immiscible with the tube main body and is embedded in the tube main body, wherein a distal end portion of the medical tube is provided. Is a medical tube characterized by not having the reinforcement. 2. A tube in which a plastic reinforcing body which is incompatible with the tube body is embedded in a spiral shape is formed, cut into a predetermined length, and then the reinforcing body is partially pulled out from the tube end and cut. A method for producing a medical tube, comprising: