JPH07214498A - How to drill a tube - Google Patents

Abstract

(57) [Summary] [Objective] To provide a method for punching a tube in which a punched piece is completely separated from the tube and does not remain in the tube. [Structure] Side wall outer surface 11 of tube 1 made of thermoplastic resin
And an ultrasonic wave generating jig 2 having a tubular cross-section and having a blade 21 formed at its tip, and a convex portion 32 abutting the inner surface of the tube 1 and conforming to the inner surface shape of the ultrasonic wave generating jig 2. The side wall 11 is sandwiched between the side wall 11 and the receiving jig 3 provided with, and ultrasonic waves are supplied to the side wall 11 via the ultrasonic wave generating jig 2.
While heating the inside of the side wall, the side wall 11 is penetrated by the ultrasonic wave generation jig 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for punching a thermoplastic resin tube.

[0002]

2. Description of the Related Art A tube made of a thermoplastic resin, such as a catheter, is used to remove blood, lymph,
It is used to drain bodily fluid such as bile, but a side hole for inhaling the bodily fluid is provided in the side wall of the tube.
The catheter has a rounded outer peripheral edge of the side hole so as not to damage the internal tissue by the edge of the side hole or prevent smooth inhalation of body fluid when the catheter is inserted into the body cavity, left in place or removed. .

As a method of providing a round side hole on the outer peripheral edge of such a side hole, as shown in FIG. 6 (a), a cross section which abuts the outer surface of the catheter 10 placed on the pedestal 40. The high-frequency generating jig 20 and the receiving jig 30 are sandwiched between the high-frequency generating jig 20 having a blade 201 formed at the tip and a receiving jig (core metal) 30 that comes into contact with the inner surface of the catheter, and sandwiches the side wall of the catheter. High frequency is supplied with and as electrodes to heat and melt the side wall of the catheter.
As shown in (b), the jig 3 for receiving the high frequency generating jig 20
There is known a method of advancing to the 0 side and punching the side wall of the catheter with the blade 201 of the high frequency generating jig 20 (Japanese Patent Publication No. 2-2.
1380). In this case, the receiving jig 30 of the portion of the high frequency generating jig 20 facing the surface of the blade 201 had a flat shape.

[0004]

However, in this method, if the blade surface of the high-frequency generating jig and the levelness of the receiving jig are not exactly aligned, a gap is created between the blade surface and the receiving jig. At the gap, part of the punched piece could not be separated from the tube and had to be removed in a separate process. Further, adjusting the levelness of the blade surface of the high-frequency generating jig and the receiving jig is a time-consuming and tedious work. The present invention solves the above problems, and its purpose is to:
The purpose of the present invention is to provide a method for punching a tube in which the punched piece is completely separated from the tube and does not remain in the tube.

[0005]

The method of the present invention will be described in detail below. In the present invention, the tube is perforated by ultrasonic waves or high frequencies. First, a method of punching a tube of the present invention by ultrasonic waves will be described. In the method of the present invention using ultrasonic waves, the inside of the side wall of the tube is heated and melted by the ultrasonic wave, and the side wall in that state is perforated. Therefore,
The ultrasonic wave generation jig used in the present invention has both a function of giving an ultrasonic wave and a punching function. The ultrasonic wave generation jig is connected to an ultrasonic wave oscillator, is a steel tubular body having a circular or elliptical cross section, and has a blade formed at the peripheral edge of the tip end portion of the tubular body. Further, it is preferable that a side hole for discharging the punched piece is provided on a side portion of the cylindrical body. In addition, if the outer peripheral edge of the tubular body is tapered toward the blade edge,
It is preferable because it gives a smoother roundness to the outer peripheral edge of the perforated through hole.

The receiving jig is inserted into the tube, contacts the inner surface of the side wall pressed by the ultrasonic wave generating jig, and restricts the movement of the ultrasonic wave generating jig penetrating the side wall. The portion of the ultrasonic wave generation jig facing the blade surface is provided with a convex portion that conforms to the inner surface shape of the ultrasonic wave generation jig. The material is not particularly limited as long as it has sufficient hardness.

The output of the ultrasonic wave given to the ultrasonic wave generation jig is
It may be appropriately adjusted depending on the type and thickness of the thermoplastic resin that is the material of the tube. Examples of the material of the tube applicable in the method of the present invention include vinyl chloride resin and thermoplastic resins such as polyethylene, polypropylene, polyurethane elastomer, and polyamide elastomer.

When the ultrasonic wave generation jig is pressed against the outer surface of the side wall of the tube, ultrasonic waves supplied from the cutting edge of the ultrasonic wave generation jig heat and melt the inside of the side wall, and the blade has a cross section in which the tube side wall is curved from the outer surface to the inner surface. Punching into a shape to form a through hole.

It is not always necessary to continuously apply ultrasonic waves to the ultrasonic wave generation jig until the side wall is completely punched out.
The ultrasonic wave oscillation may be stopped immediately before the completion of punching, and then the punching may be completed simply by a mechanical action. By doing so, the inside of the side wall of the tube is melted by heat generation, and it is possible to form a through hole having a smooth curved outer peripheral edge, and the blade of the ultrasonic wave generating jig and the receiving jig may rub against each other. Therefore, it is possible to prevent the blade and the receiving jig from being worn.

Next, a method of punching a tube of the present invention by high frequency will be described. In the method of the present invention using high frequency, the inside of the side wall of the tube is heated and melted by the high frequency, and the side wall in that state is perforated. Therefore, the high frequency generating jig used in the present invention has both a function of giving a high frequency and a punching function. The high-frequency generating jig is connected to a high-frequency oscillator, is a steel cylindrical body having a circular or elliptical cross section, and has a blade formed on the peripheral edge of the tip of the cylindrical body. Further, it is preferable that a side hole for discharging the punched piece is provided on a side portion of the cylindrical body.

The receiving jig is inserted into the tube and has a function as an electrode for generating a high frequency wave. The receiving jig is in contact with the inner surface of the side wall pushed by the high frequency wave generating jig to move the high frequency wave generating jig penetrating the side wall. Although restricted, a portion of the receiving jig that faces the blade surface of the high-frequency generating jig is provided with a convex portion that conforms to the inner surface shape of the high-frequency generating jig. The material is not particularly limited as long as it can serve as an electrode and has sufficient hardness.

The high frequency generating jig is pressed against the outer surface of the side wall of the tube, the high frequency generating jig and the receiving jig are used as electrodes to generate high frequency, and the side wall of the tube is heated and melted by the high frequency. Is punched into a cross-sectional shape curved inward from the outer surface to form a through hole.

After the through hole is formed, when the high-frequency generating jig and the receiving jig come into contact with each other, if the high-frequency oscillator is not equipped with a spark generation preventing device, a spark is generated and the high-frequency generating jig is exposed. It is preferable to cover the receiving jig with an insulator because the blade will be melted and damaged.

[0014]

In the present invention, by applying ultrasonic waves or high frequencies to the side wall of the tube through the ultrasonic wave generating jig or the high frequency generating jig, the inside of the side wall is melted by the heat generated inside the side wall of the tube. A smooth curved through hole is formed with a peripheral edge facing inward. At this time, since the receiving jig is provided with a convex portion that conforms to the inner surface shape of the ultrasonic wave generating jig or the high frequency generating jig, the blade surface and the receiving jig are slightly not aligned, Even if it is not completely separated from the tube, if the convex part of the receiving jig enters the inside of the ultrasonic wave generating jig or the high frequency generating jig, it will be cut by the step between the receiving jig and the blade surface. Can be reliably separated.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the punching method of the present invention will be described with reference to the drawings. Example 1 FIG. 1 is an explanatory view showing a part of an embodiment of a drilling method of the present invention in a cross section. As shown in FIG. 1, a support rod 41 erected at one end of a pedestal 4 has A flat portion 31 is formed, and a convex portion 32 is provided along the inner surface of the ultrasonic wave generating jig 2 at a portion facing the surface of the blade 21 of the ultrasonic wave generating jig 2. The receiving jig 3 is provided horizontally, and the receiving jig 3 is inserted into the tube 1. The convex portion 32 is a cylinder having a diameter of 1 mm and a height of 1 mm, and the tube 1 is made of a soft vinyl chloride resin having an inner diameter of 4 mm and a wall thickness of 1 mm.

Reference numeral 2 denotes a steel ultrasonic wave generation jig having a circular cross section with an inner diameter of 2 mm in the lower half portion, and the outer surface of the lower end portion is shaved to form a blade 21 to form a blade 21 on the outer surface of the side wall 11 of the tube 1. It is arranged. A side hole 22 for discharging the side hole punching piece is provided on the side portion of the ultrasonic wave generating jig 2.

FIG. 2 is a side view showing the entire apparatus provided with the portion shown in FIG. 1, which is an ultrasonic oscillator (manufactured by Seidensha Denshi Kogyo Co., Ltd.) provided above the ultrasonic wave generation jig 2. SONOPET-15
0K) 7 is connected by a conductor 81 to a control unit 8 for adjusting the output of ultrasonic waves. Reference numeral 51 is a column that is erected on the pedestal 5 of the ultrasonic oscillator, and an air cylinder 6 is attached to the end of the column. It is connected to the air cylinder 6 and can move up and down.

FIGS. 3 (a), 3 (b) and 3 (c) are enlarged cross-sectional views for explaining the order of perforating the side wall 11 of the tube 1 by the method of the present invention using the above apparatus. As shown in FIG. 3A, the receiving jig 3 is inserted into the tube 1, and the ultrasonic wave generating jig 2 is arranged above the convex portion 32 provided on the flat portion 31 of the receiving jig 3. . The output is adjusted by the control unit 8 and the frequency 4 generated by the ultrasonic oscillator 7 is adjusted.
An ultrasonic wave of 8.5 KHz is sent to the ultrasonic wave generating jig 2,
As shown in (b), the ultrasonic wave generation jig 2 was lowered by the piston 61 and pressed against the outer surface of the tube side wall 11 with a pressure of 5 kg / cm ² , and punched as shown in FIG. 3 (c). The piece 12 was completely separated from the tube 1. When the boring was continued using another tube, the punched piece 12 moved up inside the ultrasonic wave generating jig and was discharged from the side hole 22.

FIG. 4 shows a longitudinal sectional view of the tube 1 having the through holes 13, 13. Side wall 1 of the part that received ultrasonic waves
Although the inside of 1 melted due to the heat generated by ultrasonic waves, the surface of that portion did not melt, and it was possible to obtain the tube 1 having the through holes 13, 13 having a smooth surface from the outer peripheral edge 14 toward the inside.

Embodiment 2 FIG. 5 is an enlarged sectional view of an essential part showing an embodiment of a method of punching by high frequency. A high-frequency generating jig 2'having a tubular cross-section with a blade 21 'formed at the tip, and a receiving jig 3 inserted into the tube 1 and provided with a convex portion 32 along the inner surface shape of the high-frequency generating jig 2'. High frequency oscillator (not shown)
A higher-frequency current was applied to the base 4 to fix the base 4, and the high-frequency generating jig 2'was lowered by a piston (not shown) connected to the air cylinder and pressed against the side wall of the tube as shown in FIG. 5 (a). However, as shown in FIG. 5B, the punching piece 12 was completely cut off from the tube 1 by punching.

[0021]

Since the tube boring method of the present invention has the above-mentioned structure, the tube and the punching piece can be completely separated. Also, even if the blade surface of the ultrasonic wave generation jig or high frequency generation jig and the receiving jig are slightly different in level and the punching piece and the tube are not completely separated, the convex portion of the receiving jig generates ultrasonic waves. When it enters the jig or the high frequency generating jig, it is cut by the step between the receiving jig and the blade surface, so that the punching piece can be reliably separated.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a part of an embodiment of a method of the present invention in section.

FIG. 2 is a side view showing the entire apparatus for carrying out the method of the present invention.

FIG. 3 is an enlarged sectional view of an essential part showing the order of the present invention.

FIG. 4 is a longitudinal sectional view of a tube according to the present invention.

FIG. 5 is an enlarged sectional view of an essential part showing the sequence of the present invention.

FIG. 6 is an enlarged cross-sectional view of a main part showing a conventional technique.

[Explanation of symbols]

 1 tube 2 ultrasonic wave generation jig 2 ', 20 high frequency wave generation jig 3, 30 receiving jig 4, 40 pedestal 5 pedestal 6 air cylinder 7 ultrasonic oscillator 8 control unit 10 catheter 11 side wall 12 punching piece 13 through hole 14 Outer peripheral edges 21, 21 ', 201 Blade 22 Side hole 31 Flat portion 32 Convex portion 41 Support rod 51 Strut 61 Piston 81 Conductor wire

Claims (1)

[Claims] 1. An ultrasonic wave generating jig or a high frequency wave generating jig, which is disposed on the outer surface of a side wall of a tube made of a thermoplastic resin and has a tubular cross-section, and a blade is formed at the tip thereof, and a receiver abutted on the inner surface of the tube. The side wall is sandwiched with a jig, and ultrasonic waves or high frequencies are supplied to the side wall via an ultrasonic wave generation jig or a high frequency wave generation jig to heat the inside of the side wall and generate ultrasonic waves on the side wall. In a method of drilling a tube which is pierced by a tool or a high-frequency generating jig, the receiving jig has a convex portion along the inner surface shape of the ultrasonic-wave generating jig or the high-frequency generating jig. How to open.