JPH10100100A - Drilling device and drilling method of side surface of tube having partition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drilling device and drilling method of the side surface of a tube which has such a partition that the tube, even if formed of thermoplastic resin and small in inside diameter can have a hole with a smooth edge drilled in its side surface, without hurting the partition. SOLUTION: This drilling device is a device for drilling a hole in the side surface of a tube which has a cross section structure partitioned at least in two chamber by a partition wall, and it has a punching edge 4 in order to abut to the outer surface of a tube 1 and to open a hole there; a jig and its supporting board to abut to the inner surface of the tube 1 and to suppress its deformation; and a cradle 6 to hold the tube 1 from the lower side. The punching edge 4 furnishes a heating device 41 which can heat itself, and it is connected to an air cylinder 5 which moves up and down in the vertical direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for piercing a side wall of a tube having a partition wall.

[0002]

2. Description of the Related Art Conventionally, when a hole is formed in a side surface of a tube formed of a thermoplastic resin, a high frequency welder,
An ultrasonic welder, a punching blade, a rotary blade, and the like are used. However, if the edge of the hole formed in the side surface becomes sharp, the tissue may be damaged when the tube is inserted into the body. Therefore, it is necessary to process the edge of the hole smoothly.

[0003] However, when a hole is made in the side surface using the above-mentioned punching blade or rotary blade, the edge of the hole is machined vertically, and it is difficult to obtain a hole with a smooth edge. Therefore, as a method for making a smooth hole at the edge of the side surface of the tube, a method using a high frequency welder or an ultrasonic welder has been proposed (for example, Japanese Patent Application Laid-Open No. 60-63).
128, JP-A-7-205098, JP-A-7-213616, JP-A-6-106625, JP-A-7-214498, and the like.

As a method of making a hole in the side surface of a tube by using an ultrasonic welder, for example, a method shown in FIG. 5 is performed. In this method, after the receiving jig 12 is inserted into the tube 11, the ultrasonic horn 13 is lowered, and the ultrasonic horn 13 is pressed from the outside of the tube to make a hole in the side surface. By using such a receiving jig 12, it is possible to prevent the deformation of the tube 11 which occurs when pressed by the ultrasonic horn 13, and to form a hole having a smooth edge portion with high dimensional accuracy.

However, for example, as shown in FIG. 6, a hole is formed on the side surface of the tube 11 having a sectional structure divided into two large and small chambers 16 and 17 by a partition wall 14 using the ultrasonic welder. When the diameter of the tube 11 is small, the gap between A and B is small, and the receiving jig 12 shown in FIG. 7 must be thin. As a result, for example, as shown in FIG. 8, when the ultrasonic horn 13 presses the side surface, the receiving jig 12 may be deformed, and the ultrasonic horn 13 may melt to the partition 14.

Therefore, as shown in FIG. 9, a method of inserting the support base 15 into the large chamber 17 to prevent the deformation of the receiving jig 12 can be considered. However, when the receiving jig 12 becomes thin, the receiving jig 12 resonates due to the ultrasonic vibration, and the receiving jig 12 may serve as an ultrasonic horn to melt the partition wall 14.

When using a high-frequency welder,
As shown in FIG. 10, the minus electrode 24 is inserted into the small chamber 26 side of the tube 21 via the insulating plate 25. However, when the diameter of the tube 21 is reduced, the insulating plate 25 becomes thinner, and the insulating effect is reduced. Discharge occurs between the positive electrode 23 and the negative electrode 24, which are blades, and there is a problem that the spark of the discharge burns the tube 21. Further, the high frequency welder cannot be applied to a resin that does not react to high frequency, for example, polyethylene.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to form a smooth hole in the side surface of a tube having a small inner diameter formed of a thermoplastic resin without damaging a partition wall. Provided are an apparatus and a method for punching a side surface of a tube having a flexible partition wall.

[0009]

SUMMARY OF THE INVENTION The present invention relates to an apparatus and a method for piercing a side wall of a tube having a partition wall, the apparatus for piercing a side wall of a tube having a cross-sectional structure divided into at least two chambers by the partition wall. The apparatus has a punching blade for making a hole in contact with the outer surface of the tube, and a receiving jig and a support table for making contact with the inner surface of the tube to suppress deformation thereof, and the punching blade itself is provided. Characterized in that it is provided with a heating device capable of heating.

The tube used in the present invention is made of a thermoplastic resin such as vinyl chloride resin, polyethylene, polypropylene, urethane resin, nylon, ABS, etc., and has a sectional structure divided into at least two chambers by partition walls. Having.

The side punching device of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing the side hole punching device. In FIG. 1, reference numeral 1 denotes a tube which is held from below by a receiving base 6 and has a sectional structure partitioned into two chambers. Reference numeral 4 denotes a punching blade for making a hole in the side surface of the tube 1, and includes a heating device 41 for heating the punching blade 4. A heat insulating plate 42 is used between the heating device 41 and the air cylinder 5 so that the heat from the heating device 41 is transmitted to the air cylinder 5 and the rubber packing of the air cylinder 5 is not damaged.

The punching blade 4 is connected to an air cylinder 5 fixed to an arm 51 attached to a column 52, and can be moved up and down by the air cylinder 5.

When the punching blade 4 is to be lowered, compressed air from an air compressor (not shown) is sent to the air cylinder 5 via an air tube 72 by an air cylinder raising / lowering switch 8, and the air cylinder 5 is lowered. Let it. At this time, the air pressure of the air tube 71 is released to the atmospheric pressure.

When the punching blade 4 is raised, compressed air from an air compressor (not shown) is sent to the air cylinder 5 via an air tube 71 by an air cylinder lifting / lowering switch 8, and the air cylinder 5 To rise. At this time, the air pressure of the air tube 72 is released to the atmospheric pressure.

When the tube 1 is opened by the punching blade 4, the receiving jig 2 is inserted into the small chamber 1a of the tube 1 and the support base 3 is inserted into the large chamber 1b, as shown in FIG. In this state, the punch 4 is heated by the heating device 41 to lower the punching blade 4 maintained at a predetermined temperature, and abuts the side surface of the tube 1 to form a punching hole. After the opening, the punching blade 4 is raised.

The receiving jig 2 prevents the small chamber 1a of the tube 1 from being deformed by the contact of the punching blade 4, and also prevents the partition 9 from being damaged. By preventing deformation of the small chamber 1a, it is possible to form a hole with high dimensional accuracy. The material of the receiving jig 2 is preferably made of a metal such as iron, copper, stainless steel, or brass in consideration of contact with the punching blade 4, but is preferably made of Teflon in order to have a heat insulating effect. Is also good.

The support base 3 is used to reinforce the receiving jig 2 having a small thickness, and if it is strong, a material such as metal, resin, and wood can be used. However, when processing a medical tube, it is not preferable to use a wooden support because debris may be mixed.

The receiving jig 2 and the support 3 are shown in FIG.
As shown in (1), the one in which both are integrated may be used.

By contacting the heated punching blade 4 against the outer surface of the tube 1 to cut off the surface of the tube 1 while softening the surface, the edge of the hole cut off is smoothed. As it suppresses the blade tip from entering further, it prevents the heat of the blade from being transmitted to the partition,
A hole can be formed without damaging the partition 9 shown in FIG.

The heating temperature of the punching blade 4 is controlled by the tube 1
The melting point or softening point of the thermoplastic resin is generally 100 to 200 ° C. However, in the case of a special thermoplastic resin, 200 to 4
Since it is necessary to heat to 00 ° C., it is preferable to use a heating device 41 capable of heating from room temperature to 400 ° C.

The heating method is not particularly limited.
An electric heater or high frequency heating may be used.

By using the above-mentioned device, for example, a hole can be suitably formed in a side surface of a catheter tube.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail.

(Example 1) As a tube, a soft vinyl chloride resin tube having a cross-sectional shape having dimensions shown in FIG. 4 was prepared by blending 100 parts by weight of a vinyl chloride resin (degree of polymerization: 1000) with 50 parts by weight of a plasticizer. 13mm, 8m inside diameter
m) was used. Also, as shown in FIG.
The supporting jig 2 is inserted into the small chamber 1a, and the support base 3 is inserted into the large chamber 1b, and the temperature of the punching blade 4 is set to 150 ± 10 ° C. The cylinder 5 was lowered, and the punching blade 4 was pressed against the side of the tube. After pressing for 2 seconds, the punching blade 4 was raised from the side surface of the tube 1, and a smooth hole was formed at the edge portion, and there was no damage to the partition walls. In the side hole punching device, an iron punching blade 4 (3 mm in diameter),
Stainless steel receiving jig 2 (3.5 mm in width x 100 in length)
mm × 0.5 mm in thickness), a stainless steel support 3 (diameter 7 mm) and an air cylinder 5 having a diameter of 20 mm were used, and an electric heater with a temperature sensor was used as the heating device 41.

(Comparative Example 1) A hole was made in the side surface of the tube in the same manner as in Example 1 except that the temperature of the punching blade was set to 220 ° C. A hole of a predetermined size could not be formed.

(Comparative Example 2) A hole was formed in the side surface of the tube in the same manner as in Example 1 except that the temperature of the punching blade was set to 80 ° C or less, and a smooth hole was formed at the edge. Could not.

(Comparative Example 3) An attempt was made to make a hole in the side surface of the tube in the same manner as in Example 1 except that the pressing time of the punching blade was set to 1 second, but it was not possible to punch cleanly.

[0028]

The apparatus and method for piercing the side wall of a tube having a partition wall according to the present invention are as described above. Even in a tube having a small inner diameter formed of a thermoplastic resin, the partition wall is not damaged. A smooth hole at the edge can be formed on the side surface.

[Brief description of the drawings]

FIG. 1 is a front view showing a side hole punching device used in the present invention.

FIG. 2 is a schematic cross-sectional view showing a state where a receiving jig and a support base are inserted into a tube having a partition wall.

FIG. 3 is a schematic cross-sectional view showing an integrated receiving jig and support base.

FIG. 4 is a schematic sectional view showing a tube having a partition wall used in Examples and Comparative Examples.

FIG. 5 is a schematic cross-sectional view showing a state where a receiving jig is inserted into a tube.

FIG. 6 is a schematic sectional view showing an example of a tube having a partition.

FIG. 7 is a schematic sectional view showing a state in which a receiving jig is inserted into a tube having a partition wall.

FIG. 8 is a schematic sectional view showing a state in which a receiving jig inserted into a tube by an ultrasonic horn is deformed.

FIG. 9 is a schematic cross-sectional view showing a state where a receiving jig and a support base are inserted into a tube having a partition wall.

FIG. 10 is a schematic cross-sectional view showing a method of inserting a receiving jig into a tube having a partition and making a hole with a high-frequency welder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tube 1a Small chamber 1b Large chamber 2 Receiving jig 3 Supporting stand 4 Punching blade 41 Heating device 42 Insulating plate 5 Cylinder 51 Arm 52 Support 6 Receiving stand 71,72 Air tube 8 Cylinder up / down changeover switch 9 Partition wall

Claims (2)

[Claims] 1. A device for piercing a side wall of a tube having a cross-sectional structure partitioned into at least two chambers by a partition wall, the device comprising: a punching blade for piercing by contacting an outer surface of the tube; A side surface of a tube having a partition wall, comprising: a receiving jig and a support base that abut against an inner surface of the tube to suppress deformation thereof, wherein the punching blade includes a heating device capable of heating itself. Perforator. 2. A method for forming a hole in a side surface of a tube having a partition wall by heating a punching blade to 100 to 200 ° C. using the side hole forming apparatus according to claim 1.