JP2002345967A - Production method for measuring tube of radiation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately attach a radiation shielding marker on the outer periphery of a resin tube without fluctuation and to prevent damage to the outer periphery of the resin tube. SOLUTION: This method has a process for inserting a core metal into the resin tube, temporary wire fixing process for winding, positioning and temporarily fixing a radiation non-permeable metal wire to become the radiation non- permeable marker at least one desired position on the outer periphery of the resin tube, temporary ring fixing process for positioning and temporarily fixing a metal ring by pressing it or applying diameter reduction working thereto in the state of individually covering all the area of the spot where the radiation non-permeable metal wire is wound around the resin tube, and process for fixing the radiation non-permeable metal wire and the metal ring on the resin tube by applying the diameter reduction working to the metal ring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the manufacture of a radiation measuring tube for fixing at least one radiopaque metallic material at a desired position on the outer peripheral surface of a resin tube without damaging the outer peripheral surface of the resin tube. About the method.

[0002]

2. Description of the Related Art An apparatus having a radiopaque marker used in a diagnostic apparatus or the like using radiation and a method for manufacturing the same are disclosed in JP-A-6-197974.
12 to 14 show a manufacturing method disclosed in this publication.

As shown in FIG. 12, in order to fix a ring 102 serving as a radiopaque marker at a desired position on a tube 101, the inner diameter of the tube 101 is expanded and then the ring 102 is inserted into the tube 101. The extended end 103 is formed on the outer periphery of the insertion portion of the tube 101.

[0004] There are two types of means for expanding the tube 101. One is a means for expanding the tube 101 by heating to such an extent that the tube 101 is not melted, and the other is a means for expanding mechanically using various tools. It is.

[0005] Next, after the ring 102 is inserted into the expanded end 103, the tube 101 is contracted to return the area of the expanded end 103 to the original size as shown in FIG.
At this time, the shrinking means when the tube 101 is expanded by heating is to cool the expanded end 103 expanded by heating to shrink the tube 101 to return to the original size. On the other hand, when the tube 101 is mechanically expanded and contracted, the material is returned to its original size due to the natural elasticity of the material of the tube 101. When the expansion portion 103 is contracted in this manner, the outer peripheral surface of the tube 101 in the portion where the ring 102 is inserted is in a state of protruding from the other outer peripheral surfaces.

[0006] Next, as shown in FIG.
In order to flatten the outer peripheral surface 104 of the tube 101, the protrusion shown in FIG. 13 is removed from the outer periphery of the tube 101 by using an iron mold, a clipper, a heating die or the like.

[0007]

However, in the conventional manufacturing method described above, when the ring 102 is inserted into the expanded tube 101, there is no positioning mechanism, so that the positioning of the tube 101 in the longitudinal direction is not performed. Accuracy varies. This variation in accuracy also occurs when two or more rings 102 are inserted.
Since the distance between the two varies, when used as a radiation measurement tube, there is a problem that the length of a bile duct or the like cannot be accurately measured.

Further, when flattening the extended end portion 103 on the outer periphery of the portion into which the ring 102 is inserted, the tube 1 is formed by using an iron mold, a clipper, a heating die and the like.
01 may be damaged. If the outer peripheral surface 104 of the tube 101 is damaged, bacteria and the like easily adhere to the damaged portion, and the bacteria and the like adhere to the tube 101 and penetrate deeply into the wall of the tube 101. This allows
When it is used as a radiation measuring tube, it becomes a problem that it is not possible to remove various germs even if it is washed.

The present invention has been made in view of the above-mentioned conventional problems, and allows a metal material serving as a marker to be accurately positioned and fixed to a resin tube, and that the outer peripheral surface of the resin tube be damaged. It is an object of the present invention to provide a method of manufacturing a radiation measurement tube that does not give a problem.

[0010]

According to a first aspect of the present invention, there is provided a method for manufacturing a radiation measuring tube for fixing a radiopaque marker to an outer peripheral portion of a resin tube. A step of inserting a core metal, a wire temporary fixing step of winding a radiopaque metal wire serving as a radiopaque marker around one or more desired positions on the outer periphery of the resin tube and temporarily fixing the wire,
In a state where the entire area where the radiopaque metal wire is wound around the resin tube is individually covered with a metal ring, the metal ring is pressed or reduced in diameter to temporarily fix the position and temporarily fix the ring. Fixing the radiopaque metal wire and the metal ring to the resin tube by reducing the diameter.

According to the present invention, since the radiopaque metal wire serving as the radiopaque marker is temporarily fixed to the outer periphery of the resin tube in a state of being wound at a desired position of the resin tube, the positioning of the plurality of wire winding portions can be performed. Easy,
In addition, the radiopaque metal wire winding portions can be arranged at desired intervals.

Further, since the radiopaque metal wire and the metal ring are fixed to the resin tube while the entire area of the radiopaque metal wire winding portion is individually covered with the metal ring, the resin tube is damaged. In addition, a radiopaque metal wire can be fixed.

According to a second aspect of the present invention, there is provided a method of manufacturing a radiation measuring tube according to the first aspect, wherein the radiation opaque metal wire is wound around a resin tube prior to coating a metal ring around a winding point. The radiopaque metal wire is wound and pressed from both sides in the length direction.

[0014] By pressing the radiopaque metal wire wound around the resin tube from both sides in the lengthwise direction, it is possible to prevent a gap from being formed between the wires. For this reason, it is possible to prevent radiation from passing through between the wires, and it is possible to perform reliable measurement.

[0015]

1 to 11 show an embodiment of the present invention in the order of manufacturing steps.

First, as shown in FIG.
Insert the metal core 2 inside. The core metal 2 is inserted into the resin tube 1 until all processing steps in the manufacture of the radiation measurement tube are completed, and when a force for pushing the resin tube 1 from the outer peripheral side is applied, the resin tube 1 It is used to maintain the internal shape. In this case, if the core 2 having an outer diameter that is too large than the inner diameter of the tube is used, the core 2 is pressed into the tube 1 when inserted, and the inner surface of the tube may be damaged or deformed. It is desirable to avoid using it, and it is preferable to use a core metal having an outer diameter equal to or slightly smaller than the inner diameter of the tube to be used.

The resin tube 1 is preferably made of a material having chemical resistance and flexibility. For example, polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene (PCTFE) or the like can be selected. These are fluorine resins having high chemical resistance and flexibility, and are effective when used by inserting them into the body as medical tubes.

Next, a wire temporarily fixing step of winding and positioning and fixing a radiopaque metal wire 3 (hereinafter referred to as wire 3) around the outer peripheral surface of the tube 1 is performed. This step is further divided into first to fourth steps.

The first step is to temporarily fix the distal end portion of the wire 3 to the resin tube 1 and to temporarily fix the mold 3 (hereinafter referred to as a temporary fixing mold 12).
Described as type 12. ) Is used. As shown in FIG. 2, the mold 12 includes a pair of sandwich molds 12a and 12b.
When 2a and 12b are closed, a wire groove 4 for sandwiching and temporarily fixing the wire 3 and a tube groove 5 having the same diameter as or slightly smaller than the outer diameter of the resin tube 1 parallel to the wire groove 4 are formed. You. The depth of the wire groove 4 is smaller than the diameter of the wire 3 so as to prevent displacement when the wire 3 is sandwiched.

In order to temporarily fix the distal end of the wire 3 to the outer peripheral surface of the resin tube 1, at a desired position of the resin tube 1,
The wire 3 is fitted to the wire groove 4, and the resin tube 1 into which the metal core 2 is inserted is fitted to the tube groove 5, and the mold 12 is formed.
Between. After being sandwiched, a pair of sandwiching dies 12 are arranged so that the mold 12 does not displace with respect to the resin tube 1.
a, 12b.

Since the wire 3 is used as a radiopaque marker for medical use, its thickness is preferably about 0.1 mm or more to prevent transmission of radiation. Further, the winding width of the wire 3 is desirably 0.5 mm or more so that a shadow can be easily visually confirmed even in an X-ray photograph. The material of the wire 3 is gold, platinum, silver,
It is desirable to use tantalum, palladium or the like. When the distal end of the wire 3 is temporarily fixed to the outer peripheral surface of the resin tube 1, a sponge (not shown) is formed on the surface of the tube groove 5 so that the resin tube 1 is not damaged by contact with the mold 12. It is desirable to attach a rubber material, a resin material, or the like.

Wire 3 wound around resin tube 1
Is supplied while being wound around the wire stocker 6 as shown in FIG. Wire stocker 6 is motor 7
By rotating the motor 7 in a direction opposite to the supply direction of the wire 3, the slack of the wire 3 can be removed and a tension can be given.

Next, in the second step, as shown in FIG.
The end of the resin tube 1 is gripped by the chuck 8 while the tip of the wire 3 is temporarily fixed by the mold 12, and the wire 3 is wound. The chuck 8 is connected to a motor 9,
The wire 3 is wound around the outer peripheral surface of the resin tube 1 by the rotation of the motor 9. At this time, wire stocker 6
By rotating the motor 7 connected to the wire 3 in a direction opposite to the supply direction of the wire 3, tension is given to the wire 3, and the wire 3 wound around the outer peripheral surface of the resin tube 1 is applied.
To avoid gaps. Then, as shown in FIG. 5, after winding the wire 3 to a predetermined width to form a wire winding portion 16, the motor 9 is stopped and the resin tube 1 is released from the chuck 8.

Next, in a third step, as shown in FIG.
The resin tube 1 is inserted through a ring member 10 having an inner diameter slightly larger than the outer diameter of the resin tube 1, and is applied to the wire winding portion 16 on the side opposite to the mold 12. That is, the wire winding portion 16 is pressed by the ring member 10 and the mold 12 from both sides in the length direction. By this pressing, the wire 3 can be prevented from being loosened and a gap can be prevented, radiation can be prevented from penetrating through the gap between the wires 3, and reliable measurement can be performed.

Then, in this state, the wire stocker 6
The wire 3 that has been supplied from is cut off, and the end is folded into the outer peripheral surface of the wire winding portion 16.
At this time, processing is performed so that the end of the wire 3 does not come out of the wire winding portion 16.

Next, in a fourth step, as shown in FIG.
The metal ring 11 is put on a position covering the entire area of the wire winding portion 16. The outer diameter of the ring member 10 is the metal ring 11
And the inner diameter of the metal ring 11 is slightly larger than the outer diameter of the wire winding portion 16. This allows the metal ring 11 to pass through the ring member 10 and cover the wire winding portion 16. Here, the mold 12 is removed, and the end of the wire 3 sandwiched by the groove 4 is sunk with a pointed tool or the like between the inner peripheral surface of the metal ring 11 and the outer peripheral surface of the resin tube 1. The wire 3 is covered with a metal ring 11.

After individually covering the wire winding portions 16 provided at predetermined positions on the resin tube 1 with the metal rings 11 as described above, as shown in FIGS.
A ring temporary fixing step is performed using the positioning die 17.

The positioning die 17 is provided with a continuous groove 14 serving as a guide for the resin tube 1 and a positioning groove 13 for a metal ring into which the metal ring 11 is fitted. A plurality of positioning grooves 13 are provided in accordance with the position of the metal ring 11 covering the wire winding portion 16 temporarily fixed to the resin tube 1. That is, the wire winding portion 16 temporarily fixed in a state of being wound around the resin tube 1 is located in the metal ring 11 so that the metal ring 11 does not shift when the metal ring 11 is fitted in the positioning groove 13. The resin tube 1 is arranged on the positioning mold 17 as described above.

Then, with the resin tube 1 placed in the metal ring positioning die 17, the metal ring 11 is pressed by the pressing plate 18 from above the positioning die 17, as shown in FIG. By this pressing, the metal rings 11 are temporarily fixed at positions where the individual metal rings 11 completely cover the respective wire winding portions 16. The lower surface of the pressing plate 18, that is, the surface that presses the metal ring 11, is not shown, but is not specially processed and is a flat surface.

As described above, the clearance between the outer diameter of the resin tube 1 and the inner diameter of the metal ring 11 is set to 0 to 0.02 mm.
Process to a degree. Thereby, the frictional force between the resin tube 1 and the metal ring 11 is increased, and the positioning can be temporarily fixed so that the metal ring 11 is not easily displaced.

As an alternative to the pressing plate 18, a collet chuck (not shown), a pin vise, or a plurality of split dies having a processing surface with a radius of curvature slightly larger than the outer peripheral surface of the resin tube 1 is used. The entire surface may be pressed to reduce the diameter of the metal ring 11, and the metal ring 11 may be processed to an inner diameter slightly larger than the outer diameter of the resin tube 1. At the time of this processing, the thick portion of the metal ring 11 penetrates into the crack portion of the collet chuck, the pin pice, and the split mold to damage the metal ring 11, and the jig pressing surface comes into contact with the outer peripheral surface of the resin tube 1. In order to prevent the resin tube 1 from being damaged by this, the processing diameter of the collet chuck, the pin vise, and the plurality of split dies is 0.5 m larger than the outer diameter target value of the metal ring 11 to be processed after the diameter reduction.
It is desirable to use one that is as large as m.

Finally, the resin tube 1 to which the metal ring 11 is temporarily fixed is subjected to rotary swaging by a rotary swaging machine 15 as shown in FIG. The rotary swaging machine 15 reduces the diameter of the metal ring 11. At this time, a split mold having a groove having the same diameter as the resin tube 1 or a diameter as small as about 0.05 mm is used. At this time, the metal ring 11 is continuously beaten from the outer periphery by the split mold, and the outer diameter of the metal ring 11 is reduced to the same diameter as the resin tube 1.

By rotating all the metal rings 11 temporarily fixed on the wire winding portion 16 in this manner, the wire winding portion 16 and the metal ring 11 are completely fixed.

Then, as shown in FIG. 11, the core 2 inserted into the resin tube 1 is taken out, and the process of fixing the radiopaque marker to the outer peripheral portion of the resin tube 1 is completed.

According to such an embodiment, by covering the metal ring 11, the radiopaque metal wire 3 can be accurately positioned and fixed at a desired position on the outer peripheral portion of the resin tube 1. That is, by temporarily fixing a plurality of metal rings 11 individually so as to cover the plurality of wire winding portions 16 temporarily fixed on the outer periphery of the resin tube 1, and then reducing the diameter of the metal ring 11 and completely fixing the metal ring 11, The wire winding portion 16 can be fixed while preventing the relative movement between the ring 11 and the wire winding portion 16. Furthermore, there is no damage on the outer peripheral surface of the resin tube 1,
The appearance of the resin tube 1 is not impaired.
Does not decrease in strength.

In addition, by using a radiation measuring tube manufactured by such a manufacturing method, radiation can be irradiated from outside the body to perform stable and accurate measurement when measuring the length of a bile duct or the like. Further, by changing the distance between the radiopaque metal wires 3 having the function of a scale, finer measurement can be performed.

When the wire 3 is wound around the resin tube 1, it is generally difficult to treat both ends of the wire. However, in the present invention, since both ends of the wire 3 are completely covered with the metal ring 11, the outer periphery of the resin tube 1 is No protrusion of the wire 3 remains on the surface. Since no protrusion remains, the channel tube inside the endoscope is not damaged when the manufactured resin tube is inserted into the endoscope or the like.

[0038]

According to the first aspect of the present invention, the radiopaque metal wire can be positioned and fixed to the outer peripheral portion of the resin tube accurately by the metal ring without damaging the outer peripheral portion of the resin tube.

According to the second aspect of the present invention, it is possible to prevent a gap from being formed between the radiopaque metal wires, so that it is possible to prevent the transmission of radiation from between the radiopaque metal wires. , Reliable measurement can be performed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a step of inserting a core into a resin tube.

FIG. 2 is a perspective view illustrating a resin tube and a temporary fixing die 12.

FIG. 3 is a perspective view showing a wire stocker 6 for supplying a radiopaque metal wire to a resin tube.

FIG. 4 is a perspective view showing a step of winding a radiopaque metal wire around a resin tube.

FIG. 5 is a perspective view showing a state in which a radiopaque metal wire is wound around a resin tube to form a winding portion.

FIG. 6 is a front view showing a step of pressing a winding portion of a radiopaque metal wire wound around a resin tube.

FIG. 7 is a front view showing a step of covering a winding portion of the radiopaque metal wire with a metal ring.

FIG. 8 is a perspective view showing a step of positioning a metal ring.

FIG. 9 is a perspective view showing a step of positioning a metal ring.

FIG. 10 is a perspective view showing a step of reducing the diameter of a metal ring with a rotary swaging machine.

FIG. 11 is a perspective view showing a step of removing a core after manufacturing a radiation measurement tube.

FIG. 12 is a partial cross-sectional view showing a manufacturing process of a conventional radiation measurement tube.

FIG. 13 is a partial cross-sectional view showing a manufacturing process of a conventional radiation measuring tube.

FIG. 14 is a partial sectional view showing a conventional radiation measuring tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin tube 2 Core metal 3 Radiopaque metal wire 10 Ring member 11 Metal ring 16 Wire winding part

Claims (2)

[Claims] 1. A method of manufacturing a radiation measuring tube for fixing a radiopaque marker to an outer peripheral portion of a resin tube, comprising: inserting a core metal into the resin tube; Temporarily fixing the conductive metal wire around one or more desired positions on the outer periphery of the resin tube and temporarily fixing the position. The entire area where the radiopaque metal wire is wound around the resin tube is individually covered with a metal ring. A ring temporary fixing step of temporarily fixing the metal ring by pressing or reducing the diameter of the metal ring, and a step of reducing the diameter of the metal ring and fixing the radiopaque metal wire and the metal ring to the resin tube. A method for manufacturing a radiation measurement tube, comprising: 2. Prior to coating a metal ring around a winding point of the radiopaque metal wire, the radiopaque metal wire wound around the resin tube is pressed from both sides in the lengthwise direction. The method for producing a tube for radiation measurement according to claim 1.