Mold for extrusion molding flexible tube, and apparatus of manufacturing flexible tube

Abstract

To provide a mold capable of shortening a length of a portion where resins before and after switching mixes together when switching a resin to be extruded onto a surface of a braid wire, and an apparatus of manufacturing a flexible tube using the same.SOLUTION: A mold for extrusion molding a flexible tube comprises: a linear through hole for delivering a braid wire inserted from one end, from the other end; a first resin supply channel connected to the through hole and having a channel parallel to a plane perpendicular to a central axis of the through hole in a portion within a predetermined extent from a connection point between itself and the through hole; and a second resin supply channel connected to the through hole at one end side of the through hole than the connection point between the first resin supply channel and the through hole, and having a channel parallel to the plane in a portion within a predetermined extent from a connection point between itself and the through hole.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a die for extrusion molding a flexible tube having an outer surface of a braided wire coated with resin, and a manufacturing apparatus for a flexible tube using the die. [Background technology]

[0002] In medical institutions, tubular medical instruments called catheters are used to inject medicinal fluids, contrast agents, etc. into specific locations in a patient's body and to extract bodily fluids, etc. from the body. Since this catheter is inserted into the body through a curved blood vessel, the tip portion is required to be flexible so that it can easily bend along the curved portion of the blood vessel without damaging the blood vessel. On the other hand, the portion of the catheter that is not inserted into the body is required to have appropriate rigidity so that the catheter can be easily operated. However, some blood vessels have sharply curved portions, and a catheter that can bend at the boundary between the flexible portion and the hard portion to follow the sharply curved portion is required.

[0003] For example, Patent Document 1 describes a catheter molding device that forms an outer layer tube with two layers of a first resin and a second resin to be extruded onto a braided layer. The catheter molding device described in Patent Document 1 makes it possible to change the thickness ratio of the inner layer and the outer layer that constitute the outer layer tube by adjusting the ratio between the flow rate of the first resin extruded from the first extruder and the flow rate of the second resin extruded from the second extruder. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2005 / 120804 Summary of the Invention [Problem to be solved by the invention]

[0005] For example, by using the catheter molding device described in Patent Document 1 and switching the supply of the first resin and the second resin, it is possible to form an outer layer tube molded from a soft resin and an outer layer tube molded from a harder resin adjacent to each other.

[0006] However, even if the resin supplied to the mold is switched from the first resin to the second resin, the supply of the first resin does not immediately stop because pressure remains in the first resin in the flow path of the first resin, and the first resin in the flow path of the first resin continues to be extruded. Also, it has been confirmed that for a while after the extrusion of the second resin starts, the first resin remaining in the flow path of the first resin is drawn out by the second resin.

[0007] The resin flow path needs to be provided around the entire circumference of the outer surface of the mold so that the resin can be supplied to the entire outer surface of the braided layer at the same time. Since the mold in Patent Document 1 has a conical shape (forward tapered shape), the volume of the resin flow path provided on the outer surface of the mold is large, and the amount of the first resin extruded after switching the resin is large. Therefore, with the molding device described in Patent Document 1, it is difficult to shorten the length of the part molded with a mixed resin of soft and hard resins, and it is not suitable for manufacturing a catheter that can be sharply bent at the boundary between the soft and hard resins.

[0008] Therefore, an object of the present invention is to provide a mold that can shorten the length of the portion where the resin before and after switching is mixed when switching the resin to be extruded onto the surface of the braid wire, and a flexible tube manufacturing device using the mold. [Means for solving the problem]

[0009] The mold for extrusion molding a flexible tube according to the present invention comprises a straight-line through hole through which a blade wire is inserted from one end and fed out from the other end, a first resin supply path connected to the through hole and having a flow path parallel to a plane perpendicular to the central axis of the through hole in a predetermined range from the connection point with the through hole, and a second resin supply path connected to the through hole on the one-end side of the through hole relative to the connection point between the first resin supply path and the through hole and having a flow path parallel to the plane in a predetermined range from the connection point with the through hole.

[0010] The flexible tube manufacturing apparatus according to the present invention includes a mold, a first extruder for supplying a first resin to the mold, a second extruder for supplying a second resin different from the first resin to the mold, a first valve provided between the mold and the first extruder for controlling the supply of the first resin, and a second valve provided between the mold and the second extruder for controlling the supply of the second resin.The mold includes a linear through hole through which a blade wire inserted from one end is fed out from the other end, a first resin supply path connected to the through hole and having a flow path parallel to a plane perpendicular to the central axis of the through hole in a predetermined range from the connection point with the through hole, and a second resin supply path connected to the through hole on the one end side of the through hole relative to the connection point between the first resin supply path and the through hole and having a flow path parallel to the plane in a predetermined range from the connection point with the through hole. Effect of the Invention

[0011] According to the present invention, it is possible to provide a mold that can shorten the length of the portion where the resin before and after switching is mixed when switching the resin to be extruded onto the surface of a braid wire, and a flexible tube manufacturing device using the same. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a top view showing a schematic configuration of a flexible tube manufacturing apparatus according to an embodiment. [Diagram 2] Cross-sectional view taken along line II-II in Figure 1. [Diagram 3] Schematic diagram of a mold according to an embodiment [Figure 4]FIG. 3 is a plan view of the first plate flange shown in FIG. [Diagram 5] FIG. 3 is a plan view of the first spacer shown in FIG. 2; [Figure 6] FIG. 3 is a plan view of the second plate flange shown in FIG. [Figure 7] FIG. 3 is a plan view of the second spacer shown in FIG. 2; [Figure 8] Schematic diagram of a mold according to Modification 1 [Figure 9] Schematic diagram of a mold according to Modification 2 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] An embodiment of the present invention will be described below. In the following description, an example will be described in which the present invention is applied to a manufacturing apparatus for a flexible tube in which a braid (braiding) is provided on the outer surface of an inner layer tube, which is a resin layer, and the braid is further covered with an outer layer tube, which is a resin layer. A catheter shaft can be cited as an example of such a flexible tube. However, a catheter shaft is merely an example of a flexible tube, and the present invention can also be applied to a manufacturing apparatus for a flexible tube for other purposes, such as a flexible tube used in an endoscope.

[0014] Fig. 1 is a top view showing a schematic configuration of a flexible tube manufacturing apparatus according to an embodiment, Fig. 2 is a cross-sectional view taken along line II-II shown in Fig. 1, and Fig. 3 is a schematic diagram of a mold according to an embodiment. In Fig. 3, for the sake of simplicity, the rotational positions of each member are different from those of the actual configuration.

[0015] The flexible tube manufacturing apparatus 100 is an apparatus for extruding a flexible tube 7 using a resin, and includes a mold 9, a first extruder 1, a second extruder 2, a third extruder 3, a fourth extruder 4, a first valve 21, a second valve 22, a third valve 23, and a fourth valve (not shown). The flexible tube manufacturing apparatus 100 is fixed on a predetermined stand or the like via a pedestal. Although not shown, a supply device for supplying the braided wire 6, a cooling device for cooling the extruded flexible tube 7, a take-up device for taking up the flexible tube 7, and the like are appropriately provided on the upstream and downstream sides of the mold 9. The braided wire 6 is transported from the rear side to the front side of the flexible tube manufacturing apparatus 100. The braided wire 6 is formed by providing a braid (braid) 27 on the outer surface of an inner layer tube 28 made of resin, and inserting a core wire (guide wire) 29 into the hollow part of the inner layer tube 28 (see FIG. 3(b)). The flexible tube 7 has an outer tube 26 provided on the surface of the braided wire 6, and the catheter shaft can be obtained by removing the core wire 29 of the braided wire 6 after the outer tube 26 has been formed.

[0016] The mold 9 includes a linear through hole 16 through which the braid wire 6 inserted from the rear end 17a is fed from the front end 17b, a first resin supply path 11, a second resin supply path 12, a third resin supply path 13, and a fourth resin supply path 14. The first resin supply path 11, the second resin supply path 12, the third resin supply path 13, and the fourth resin supply path 14 are all connected to the through hole 16. The first resin, the second resin, the third resin, and the fourth resin are respectively supplied to the first resin supply path 11, the second resin supply path 12, the third resin supply path 13, and the fourth resin supply path 14 from the first extruder 1, the second extruder 2, the third extruder 3, and the fourth extruder. The configuration of the mold 9 will be described in detail later.

[0017] The first extruder 1, the second extruder 2, the third extruder 3, and the fourth extruder 4 are, for example, screw extruders, and can melt resin pellets and extrude them from the discharge port at the tip at a constant speed. The first extruder 1, the second extruder 2, the third extruder 3, and the fourth extruder 4 are respectively supplied with a first resin, a second resin, a third resin, and a fourth resin. Typically, the first to fourth resins are resins with different hardnesses. However, when the supply to the mold 9 is switched in the order of the first to fourth resins, it is sufficient that the hardnesses of the resins before and after the switching are different, and two of the first and second resins may have the same hardness. In addition, the hardnesses of the first to fourth resins do not necessarily need to increase (or decrease) in the order of switching, and can be set according to the application site of the flexible tube 7. The molten resin extruded from the first extruder 1, the second extruder 2, the third extruder 3 and the fourth extruder 4 is supplied to the mold 9 via the first valve 21, the second valve 22, the third valve 23 and the fourth valve.

[0018] The first valve 21 is provided between the first extruder 1 and the first resin supply path 11 of the mold 9. The first valve 21 can switch between a state in which the first extruder 1 and the first resin supply path 11 communicate with each other and a state in which the first extruder 1 and the first resin supply path 11 are blocked. Similarly, the second valve 22 is provided between the second extruder 2 and the second resin supply path 12 of the mold 9. The second valve 22 can switch between a state in which the second extruder 2 and the second resin supply path 12 communicate with each other and a state in which the second extruder 2 and the second resin supply path 12 are blocked. The third valve 23 is provided between the third extruder 3 and the third resin supply path 13 of the mold 9. The third valve 23 can switch between a state in which the third extruder 3 and the third resin supply path 13 communicate with each other and a state in which the communication between the third extruder 3 and the third resin supply path 13 is blocked. Although not shown in Figs. 1 and 2, a fourth valve is provided between the fourth extruder 4 and the fourth resin supply path 14 of the mold 9. The fourth valve can switch between a state in which the fourth extruder 4 and the fourth resin supply path 14 communicate with each other and a state in which the communication between the fourth extruder 4 and the fourth resin supply path 14 is blocked.

[0019] The first valve 21, the second valve 22, the third valve 23, and the fourth valve each include, for example, a cylindrical valve body that can rotate around a predetermined rotation axis, a case that houses the valve body, and a drive device such as a motor that rotates the valve body. The valve body and the case are provided with a plurality of flow paths formed by grooves and through holes, and the connection state of the flow paths provided in the valve body and the case changes depending on the rotation position of the valve body, and can be controlled to a state in which the extruder and the resin supply path are connected and a state in which the extruder and the resin supply path are blocked. It is preferable that the first valve 21, the second valve 22, the third valve 23, and the fourth valve can discharge (discard) the resin supplied from the corresponding extruder to the outside when the first valve 21, the second valve 22, the third valve 23, and the fourth valve block the connection between the corresponding extruder and the corresponding resin supply path. In this configuration, the internal pressure fluctuation of the resin supplied from each extruder to the valve can be suppressed, so that the resin can be stably supplied from each valve to the resin supply path of the mold 9. The first valve 21, the second valve 22, the third valve 23 and the fourth valve are not particularly limited in configuration or arrangement as long as they can control the supply of the resin as described above.

[0020] The flexible tube manufacturing apparatus 100 further includes a control device 20. The control device 20 includes a computer including a CPU, a memory, a storage device, a communication interface, and the like, and is connected to the first extruder 1, the second extruder 2, the third extruder 3, the fourth extruder, the first valve 21, the second valve 22, the third valve 23, and the fourth valve via signal lines (not shown). The control device 20 controls the operation of each of these devices connected via the signal lines. The control device 20 may also control various devices arranged on the upstream side and downstream side of the flexible tube manufacturing apparatus 100.

[0021] Hereinafter, a configuration example of the mold 9 according to this embodiment will be described in detail with reference to FIGS.

[0022] The mold 9 of this embodiment is constructed by stacking a die 10, a first plate flange 31, a first spacer 41, a second plate flange 32, and a second spacer 42 in this order and integrating them with bolts or the like.

[0023] Figures 4, 5, 6, and 7 are plan views of the first plate flange, the first spacer, the second plate flange, and the second spacer, respectively, shown in Figure 2. Figures 4(a), 5(a), 6(a), and 7(a) correspond to views seen from the direction A indicated by the arrow in Figure 3, and Figures 4(b), 5(b), 6(b), and 7(b) correspond to views seen from the direction B indicated by the arrow in Figure 3.

[0024] The die 10 has a through hole in the center that constitutes an extrusion outlet (end 17b) through which the flexible tube 7 is extruded, and a first flat surface P1 (see Figure 3) that is perpendicular to the central axis Ax of the through hole 16 on the end 17b side rather than the extrusion outlet (end 17b).

[0025] 3 and 4, the first plate flange 31 is a flat member having a second flat surface P2 in close contact with the first flat surface P1 and a third flat surface P3 parallel to the second flat surface P2. The first plate flange 31 is formed with through holes 34a and 35a, a first groove 112 connected to the through holes 34a and 35a on the second flat surface P2 side, and a second groove 122 connected to the through hole 34a on the third flat surface P3 side.

[0026] The first spacer 41 is a flat member having the same outer shape as the first plate flange 31, and as shown in Figures 3 and 5, has a fourth flat surface P4 in close contact with the third flat surface P3 of the first plate flange 31, and a fifth flat surface P5 parallel to the fourth flat surface P4. The first spacer 41 has through holes 34b, 35b, and 36a formed therein.

[0027] The second plate flange 32 is a flat member having the same outer shape as the first plate flange 31, and has a sixth flat surface P6 that is in close contact with the fifth flat surface P5 of the first spacer 41, and a seventh flat surface P7 that is parallel to the sixth flat surface P6, as shown in Figures 3 and 6. The second plate flange 32 is formed with through holes 34c, 35c, 36b, and 37a, a third groove 132 connected to the through holes 34c and 37a on the fifth flat surface P5 side, and a fourth groove 142 connected to the through hole 34c on the sixth flat surface P6 side.

[0028] The second spacer 42 is a flat member having the same outer shape as the first plate flange 31, and has an eighth flat surface P8 in close contact with the seventh flat surface P7 of the second plate flange 32 and a ninth flat surface P9 parallel to the eighth flat surface P8, as shown in Figures 3 and 7. The first spacer 41 has through holes 34d, 35d, 36c, 37b, and 38 formed therein.

[0029] In the mold 9, the through hole 16 is formed by the through hole of the die 10, the through hole 34a of the first plate flange 31, the through hole 34b of the first spacer 41, the through hole 34c of the second plate flange 32, and the through hole 34d of the second spacer 42.

[0030] The above-mentioned first resin supply path 11, second resin supply path 12, third resin supply path 13 and fourth resin supply path 14 are formed by a combination of through holes and / or grooves provided in the die 10, the first plate flange 31, the first spacer 41, the second plate flange 32 and the second spacer 42.

[0031] The first resin supply path 11 includes a flow path (first flow path) constituted by the through hole 35a of the first plate flange 31, the through hole 35b of the first spacer 41, the through hole 35c of the second plate flange 32, and the through hole 35d of the second spacer 42, and a flow path constituted by a first groove 112 of the first plate flange 31, which connects the through hole 16 and the through hole 35a (first flow path) between the first flat surface P1 of the die 10. The flow path constituted by the first groove 112 is provided in a portion within a predetermined range from the connection point between the first resin supply path 11 and the through hole 16, and is a flow path that allows the resin to flow in a direction parallel to a plane perpendicular to the central axis Ax of the through hole 16.

[0032] The second resin supply path 12 includes a flow path (second flow path) constituted by the through hole 36a of the first spacer 41, the through hole 36b of the second plate flange 32, and the through hole 36c of the second spacer 42, and a flow path constituted by the second groove 122 of the first plate flange 31, connecting the through hole 16 and the through hole 36a (second flow path) of the first spacer 41 between the fourth flat surface P4 of the first spacer 41. The flow path constituted by the second groove 122 is connected to the through hole 16 on the end 17a side of the through hole 16 from the connection point between the first resin supply path 11 and the through hole 16, and is a flow path that causes the resin to flow in a direction parallel to a plane perpendicular to the central axis Ax of the through hole 16 in a portion within a predetermined range from the connection point between the second resin supply path 12 and the through hole 16.

[0033] The third resin supply path 13 includes a flow path (third flow path) formed by the through hole 37a of the second plate flange 32 and the through hole 37b of the second spacer 42, and a flow path formed by the third groove 132 of the second plate flange 32, connecting the through hole 16 and the through hole 37a (third flow path) between the fifth flat surface P5 of the first spacer 41. The flow path formed by the third groove 132 is connected to the through hole 16 on the end 17a side of the through hole 16 relative to the connection point between the second resin supply path 12 and the through hole 16, and is a flow path that causes the resin to flow in a direction parallel to a plane perpendicular to the central axis Ax of the through hole 16 in a portion within a predetermined range from the connection point between the third resin supply path 13 and the through hole 16.

[0034] The fourth resin supply path 14 includes a path (fourth path) formed by the through hole 38 of the second spacer 42, and a path formed by the fourth groove 142 of the second plate flange 32, which connects the through hole 16 and the through hole 38 (fourth path) between the eighth flat surface P8 of the second spacer 42. The path formed by the fourth groove 142 is connected to the through hole 16 on the end 17a side of the through hole 16 relative to the connection point between the fourth resin supply path 14 and the through hole 16, and is a path that causes the resin to flow in a direction parallel to a plane perpendicular to the central axis Ax of the through hole 16 in a portion within a predetermined range from the connection point between the fourth resin supply path 14 and the through hole 16.

[0035] Hereinafter, a method for extrusion molding a flexible tube using the flexible tube manufacturing apparatus 100 will be described with reference to Fig. 3. In the following description, an example will be described in which the first resin, the second resin, the third resin, and the fourth resin have high hardness in that order, and the resins are supplied to the through hole 16 of the mold 9 in the order from the resin with the lowest hardness.

[0036] First, the control device 20 opens the first valve 21 and closes the second valve 22, the third valve 23, and the fourth valve, and supplies the first resin extruded from the first extruder 1 to the through hole 16 of the mold 9 through the first resin supply path 11. While supplying the first resin to the mold 9, the braided wire 6 inserted into the through hole 16 is fed out from the extrusion port (the end 17b of the through hole 16), so that the surface of the braided wire 6 is covered with the first resin.

[0037] Next, the control device 20 opens the second valve 22 and closes the first valve 21, the third valve, and the fourth valve, and supplies the second resin extruded from the second extruder 2 to the through hole 16 of the mold 9 through the second resin supply path 12. Immediately after the resin supplied to the mold 9 is switched from the first resin to the second resin, the first resin remains in the through hole 16, and therefore a portion (shaded portion in FIG. 3(b)) formed by a mixed resin of the first resin and the second resin is generated in the outer layer tube 26 covering the braided wire 6. In addition, a part of the resin in the first groove 112 is drawn into the through hole 16 by the flow of the second resin. However, in this embodiment, a portion of the first resin supply path 11 within a predetermined range from the connection portion with the through hole 16 is formed parallel to a plane perpendicular to the central axis Ax of the through hole 16. Therefore, compared to the case where a conical mold as in Patent Document 1 is used, it is possible to reduce the amount of the first resin that flows into the through hole 16 after switching. Therefore, the length of the portion formed of the mixed resin of the first resin and the second resin can be shortened, and flexible tube 7 can be manufactured that can be sharply bent at the connection portion between the portion made of the first resin and the portion made of the second resin.

[0038] Thereafter, the control device 20 similarly opens the third valve 23 and closes the first valve 21, the second valve 22, and the fourth valve, and supplies the third resin extruded from the third extruder 3 to the through hole 16 of the mold 9 through the third resin supply path 13. Next, the control device 20 opens the fourth valve and closes the first valve 21, the second valve 22, and the third valve 23, and supplies the fourth resin extruded from the fourth extruder 4 to the through hole 16 of the mold 9 through the fourth resin supply path 14. By controlling in this manner, as shown in FIG. 3(b), an outer layer tube 26 having a first resin portion, a second resin portion, a third resin portion, and a fourth resin portion in this order and having a stepwise change in hardness can be formed. Similar to the first groove 112, the second groove 122 and the third groove 123 are formed along a plane perpendicular to the central axis Ax. Therefore, the amount of the second resin flowing into the through hole 16 after switching from the second resin to the third resin, and the amount of the third resin flowing into the through hole 16 after switching from the third resin to the fourth resin can be reduced.

[0039] As described above, by using the die 9 according to this embodiment, when the resin to be extruded onto the surface of the braided wire 6 is switched, the length of the portion where the resins before and after the switching are mixed can be shortened. As a result, the flexible tube 7 that can be bent sharply (with a large curvature) can be manufactured in the three shaded areas shown in FIG. 3(b). In addition, in the die 9 according to this embodiment, the resin is supplied from the flow path formed by the first groove 112, the second groove 122, the third groove 132, and the fourth groove 142 in a direction perpendicular to the central axis Ax of the through hole 16, that is, in the radial direction of the braided wire 6. In this case, the injection pressure of the resin is applied in the radial direction of the braided wire 6, and the molten resin for forming the outer tube 26 can reach the inner tube 28, thereby improving the adhesion of the outer tube 26 to the braid 27.

[0040] In the above embodiment, the outer tube 26 is extruded while switching between four types of resin. However, the following modifications are possible depending on the number of bendable portions.

[0041] FIG. 8 is a schematic diagram of a mold according to the first modification.

[0042] The mold 18 shown in FIG. 8(a) is composed of a die 10, a first plate flange 31, and a first spacer 41. The mold 18 has a through hole 16, a first resin supply path 11, and a second resin supply path 12. The configurations of the members and the resin supply paths are the same as those described above, so repeated explanations will be omitted. When a flexible tube manufacturing apparatus is constructed using the mold shown in FIG. 8(a), the third extruder, the fourth extruder, the third valve, and the fourth valve can be omitted.

[0043] When the resin supplied to the mold 18 shown in FIG. 8(a) is switched from the first resin to the second resin and a flexible tube 7 is extrusion molded, a flexible tube 7 having one bendable portion can be manufactured as shown in FIG. 8(b).

[0044] FIG. 9 is a schematic diagram of a mold according to the second modification.

[0045] The mold 19 shown in Fig. 9(a) is the mold 9 shown in the above embodiment with the fourth resin supply path 14 omitted. The mold 19 can be constructed using the second plate flange 32 not provided with the fourth groove 142 shown in Fig. 6 and the second spacer 42 not provided with the through hole 38 shown in Fig. 7. When a flexible tube manufacturing apparatus is constructed using the mold shown in Fig. 9(a), the third extruder and the fourth valve can be omitted.

[0046] When flexible tube 7 is extrusion molded by switching the resin supplied to mold 19 shown in Figure 9(a) in the order of the first resin, the second resin, and the third resin, it is possible to manufacture flexible tube 7 having two bendable portions as shown in Figure 9(b).

[0047] The configurations of the first to fourth resin supply paths shown in the above embodiment are merely examples, and the first to fourth resin supply paths do not necessarily need to pass through the mold parallel to the through hole through which the braid wire passes. The positions of the upstream ends of the first to fourth resin supply paths may be changed as appropriate depending on other configurations of the flexible tube manufacturing device. [Industrial Applicability]

[0048] INDUSTRIAL APPLICABILITY The present invention can be utilized as a manufacturing device for flexible tubes such as catheter shafts used in the manufacture of medical catheters and tubes used in endoscopes. [Explanation of symbols]

[0049] 1. First Extruder 2. Second Extruder 3. Third Extruder 4. Fourth Extruder 6-Blade Wire 7 Flexible Tube 9. Mold 10 Dice 11 First resin supply channel 12 Second resin supply path 13 Third resin supply channel 14 Fourth resin supply channel 16 Through hole 17a, 17b ends 18 Mold 19 Mold 21 First Valve 22 Second Valve 23 The Third Valve 31 First plate flange 32 Second plate flange 41 First spacer 42 Second Spacer 112 First Groove 122 Second Groove 132 The Third Groove 142 The Fourth Groove P1~P9 flat surface

Claims

1. A mold for extruding a flexible tube, comprising: a linear through hole through which the braid wire is inserted from one end and fed out from the other end; a first resin supply path connected to the through hole, the first resin supply path having a flow path parallel to a plane perpendicular to a central axis of the through hole in a portion within a predetermined range from a connection point with the through hole; a second resin supply path connected to the through hole on the one end side of the through hole closer to the connection point between the first resin supply path and the through hole, and having a flow path parallel to the plane in a predetermined range from the connection point with the through hole.

2. The mold is a die including the other end of the through hole and having a first flat surface parallel to the plane on the one end side of the through hole relative to the other end; A first plate flange having a flat plate shape and including a second flat surface in close contact with the first flat surface of the die and a third flat surface parallel to the second flat surface; a first spacer having a flat plate shape and a fourth flat surface in close contact with the third flat surface, The first resin supply path is a first flow passage penetrating the first plate flange and the first spacer and extending parallel to the through hole; a first groove that is provided in the first plate flange and that forms a flow path connecting the through hole and the first flow path between the first flat surface and the first groove; The second resin supply path is a second flow passage penetrating the first spacer and extending parallel to the through hole; The mold according to claim 1 , further comprising a second groove provided in the first plate flange and forming a flow path connecting the through hole and the second flow path between the fourth flat surface and the second groove.

3. The mold according to claim 2, further comprising a third resin supply path connected to the through hole on the one end side of the through hole closer to the connection point between the second resin supply path and the through hole, and having a flow path parallel to the plane in a predetermined range from the connection point with the through hole.

4. the first spacer has a fifth flat surface parallel to the fourth flat surface; The mold is A flat second plate flange having a sixth flat surface in close contact with the fifth flat surface and a seventh flat surface parallel to the sixth flat surface; a second spacer having a flat plate shape and an eighth flat surface in close contact with the seventh flat surface, The third resin supply path is a third flow passage penetrating the second plate flange and the second spacer and extending parallel to the through hole; The mold according to claim 3, further comprising a third groove provided in the second plate flange and forming a flow path between the fifth flat surface and the through hole and the third flow path.

5. A flexible tube manufacturing apparatus comprising: The mold and a first extruder that supplies a first resin to the mold; a second extruder that supplies a second resin different from the first resin to the die; a first extruder that is provided between the die and the first extruder and controls the supply of the first resin; A valve, a second valve provided between the die and the second extruder and configured to control the supply of the second resin; The mold is a linear through hole through which the braid wire is inserted from one end and fed out from the other end; a first resin supply path connected to the through hole, the first resin supply path having a flow path parallel to a plane perpendicular to a central axis of the through hole in a portion within a predetermined range from a connection point with the through hole; a second resin supply path connected to the through hole on the one end side of the through hole closer to the connection point between the first resin supply path and the through hole, and having a flow path parallel to the plane in a predetermined range from the connection point with the through hole.

6. The mold is a die including the other end of the through hole and having a first flat surface parallel to the plane on the one end side of the through hole relative to the other end; A first plate flange having a flat plate shape and including a second flat surface in close contact with the first flat surface of the die and a third flat surface parallel to the second flat surface; a first spacer having a flat plate shape and a fourth flat surface in close contact with the third flat surface, The first resin supply path is a first flow passage penetrating the first plate flange and the first spacer and extending parallel to the through hole; a first groove that is provided in the first plate flange and that forms a flow path connecting the through hole and the first flow path between the first flat surface and the first groove; The second resin supply path is a second flow passage penetrating the first spacer and extending parallel to the through hole; The flexible tube manufacturing apparatus of claim 5, further comprising: a second groove provided in the first plate flange and forming a flow path connecting the through hole and the second flow path between the first plate flange and the fourth flat surface.

7. a third extruder that supplies a third resin different from at least one of the first resin and the second resin to the mold; a third valve provided between the die and the third extruder and configured to control the supply of the third resin; The flexible tube manufacturing apparatus of claim 6, wherein the mold includes a third resin supply path connected to the through hole on the one end side of the through hole closer to the connection point between the second resin supply path and the through hole, and having a flow path parallel to the plane in a predetermined range from the connection point with the through hole.

8. the first spacer has a fifth flat surface parallel to the fourth flat surface; The mold is A flat second plate flange having a sixth flat surface in close contact with the fifth flat surface and a seventh flat surface parallel to the sixth flat surface; a second spacer having a flat plate shape and an eighth flat surface in close contact with the seventh flat surface, The third resin supply path is a third flow passage penetrating the second plate flange and the second spacer and extending parallel to the through hole; The flexible tube manufacturing apparatus of claim 7, further comprising a third groove provided in the second plate flange and forming a flow path connecting the through hole and the third flow path between the fifth flat surface and the third groove.

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