TW440722B - Apparatus for producing multiple channel duct assembly and method thereof - Google Patents

Abstract

The present invention resides in that a plurality of premolded inner ducts are fed to a cross-head die, and a melted outer duct is extruded around the inner ducts from the cross-head die, and then the pre-molded inner ducts and a melted outer duct are supplied into the corrugated tunnel of a molding die in which a melted outer duct is molded to have corrugations, thus producing a multiple channel duct assembly which includes a plurality of elongated inner ducts and a corrugated outer duct which encircles the inner ducts over their entire length to retain them. This method of continuously manufacturing a multiple channel duct assembly by using an extrusion molding machine with a cross-head die and a molding means has not been known heretofore.

Description

44 07 2 2 V. Description of the invention ⑴ Background of the invention I. Technical field to which the present invention pertains The present invention relates to a manufacturing apparatus for a catheter and a manufacturing method thereof for accommodating long-distance optical fibers, wires, and cables buried in an underground network, And the like. More specifically, the present invention relates to a manufacturing apparatus and manufacturing method for a multi-channel catheter assembly, including a plurality of adjacent catheters, and is suitable for accommodating long-distance optical fibers, electric wires, and the like. II. Conventional Technical Description In the underground network industry, proper design and placement of fiber optic cables or wires is essential to maintaining the integrity of the information or power transmitted by the cables. Due to the fragile texture of optical fibers and wires, they need to be protected from sources of stress (such as temperature, pressure, contaminants). For this reason, most of the improvement methods in this industry are to design a reliable combination of coverings to cover optical fibers and wires. The following is a brief discussion of one method of setting up fiber optic cables. U.S. Patent No. 4,741,593 discloses a multi-channel catheter 'having a plurality of corrugated inner catheters, which are substantially adjacent to each other in parallel, extend in the same direction, and are in close contact with each other. Each inner catheter has a series of continuous and continuous gyrations from head to tail to form continuous bulges and depressions; and an overwrap sheath made of elastic, synthetic resin. The cover has a thickness of about 5 to 15 mils of a sheath made of polyethylene gas (sheath), and the sheath (sheath) made of polyvinyl chloride covers the entire section of the corrugated inner catheter and closes it,

4407 2 2 Five 'invention description (2) To maintain the mutual abutment relationship between the inner catheters In the above-mentioned reference, it is mentioned that this type of cracked multi-channel catheter has flexibility and can be coiled on a relatively large coil. on. A considerable length of the above-mentioned multi-channel conduit is wound on the above-mentioned reel, and it can be laid into an underground communication conduit 'or placed in a trench for direct burial. This type of multi-channel conduit can comprehensively reduce the installation cost of fiber optic cables, and many of the characteristics of the above-mentioned system can also maintain the integrity of the overall structure of the conduit ', while the use of a sheath' provides greater soil protection for the system. With regard to cable ducts for optical fibers, wires, and the like, the above are the most required characteristics. However, so far, I have not seen the above-mentioned multi-channel catheters sold in the cable catheter market. The reason is that I believe that the above-mentioned multi-channel catheters actually have several key defects in strength and flexibility, which the inventor did not notice at first. A well-known fact is that although plastic inner catheters (even non-corrugated) with smaller diameters are flexible enough to be coiled on a transportable reel, the above non-wave Finger-shaped, plastic outer catheters with relatively large diameters are not flexible enough to be coiled on a transportable reel. The above multi-channel catheters include a plurality of corrugated plastic inner catheters and non-folded plastic outer catheters. Therefore, it is understandable that the above-mentioned channel guides have sufficient flexibility to be coiled on the transportable winding coil. In my opinion, this defect is because the above-mentioned multi-channel catheters cannot be used in cable ducts. One of the reasons that appears in the market. U.S. Patent No. 5,027,864 discloses an optical fiber commonly used today w 44 0 7 2 2 V. Description of the invention ¢ 3) The installation of the cable should be made of polyvinyl chloride layer to the ground, some smaller, conduits ") pipeline can be described Separate smaller lines and install external conduit. The above-mentioned inner pipe is set with a clamp and pulled until it is finished, and it is convenient to use a fiber-optic cable to pull it in. Each has an enclosed inside to facilitate security. The above is related to the protection of construction personnel; but at the same time, the first reason is that the length of the above mentioned feet ′ " ---------

method. The above reference includes the use of a hollow outer conduit made of primary olefin (PVC) forty feet long to form a first-quality barrier. The above outer conduit is used as a conduit, a long-distance (mainly made of polyethylene) pipeline (or "inside through" to provide a second layer of resistance to underground matter. There are longitudinally extending ribs on the outside (Rib), 'the above is individually provided with one' or a plurality of optical fiber cables. The method of electrical delay first needs to bow the above-mentioned inner catheter into the above-mentioned method is to use a cable shaft (spoo) located on the ground to pull in The above outer pipe is in an operating area located underground, at one end of the inner pipe, and then the inner pipe is dragged until it enters the outer pipe. The inner pipe is installed to complete the tow rope (pass it through the way of filling gas) The inner tube) is a light inner tube. The result constitutes an assembly that includes several inner tubes, or a plurality of fiber optic cables, and a protective outer tube conduit. A rib is provided around the inner tube; and It is convenient to remove the above-mentioned inner guide for installation and covering fiber optic cables during maintenance and repair. It does provide some convenience for maintenance, and it also provides effective protection for fiber optic cables. The above method also has several obvious shortcomings. The material used to make the outer catheter (PVC) does not provide sufficient bullets. 'The catheter can be used with a fiber spool (sp001) (over forty). So' every forty feet Have a connected department

V. Description of the invention (4) points, its labor cost adds a considerable expense to the total budget of the project. Second, each connection part of the outer conduit adds structural weakness to the continuous pipeline. Bit i vulnerable to infiltration by pollutants from groundwater sources. " Furthermore, the labor required to install the inner guide into the outer catheter also adds a huge amount to the cost of installation. US Patent No. 5,692,545 discloses another multi-channel catheter. The above reference includes a body portion for protecting the body, one end of the body portion extending to the second end; and at least two channels are provided, and the shaft body portion; And the area, which can accommodate at least one body portion, is made of plastic and the above-mentioned multi-channel catheter. The catheter can be produced by extrusion and installed. Therefore, the above-mentioned types of catheters also have a small number of required connections between sections, and the integrity of the data. The cable duct of the letter cable has a first end and a second end on a long and thin side; it includes a longitudinal axis, and the body portion (the body p0rti〇n is substantially parallel and completely runs through the above-mentioned channels, each of which has sufficient The communication section is thin and thin; the above body is made of a compound of rubber scraps. The inner channel part is more long with a spool to secure it. Several advantages: the above-mentioned catheters can provide less protection and increase It is said, however, that if the above percentages of defects in the rubber and rubber chips are described, the reference case can improve the flexibility of the material and increase the compound of the rubber chips of the plastics in the description of the plastic book than the above-mentioned catheters. The material duct needs to be relatively anti-ground if it needs to have a structure. According to the hardness of the above board, it is easier

4407 2 2 V. Explanation of the invention (5) The rate can improve its necessary flexibility. Therefore, in the above-mentioned multi-channel catheters, it is difficult for us to achieve the requirements of greater strength and greater flexibility at the same time. In addition, it is foreseeable that the above-mentioned type of multi-channel catheter containing a higher ratio of rubber shavings will have the inner wall of the aforementioned channel that is less smooth at the same time. The above items may be critical defects in the field of installing cable guides for optical fibers, wires, and the like. SUMMARY OF THE INVENTION The object of the present invention is to propose a manufacturing device and manufacturing method for producing a multi-channel The catheter assembly makes the installation of optical fibers, wires, and the like faster, so as to greatly save the labor and materials required to use the conventional technology. Another object of the present invention is to provide a manufacturing device and a manufacturing method for producing a multi-channel catheter assembly, so as to reduce the number of connection points required between the catheter sections and make it more robust and easy. Flexibility. Another object of the present invention is to provide a manufacturing apparatus and a manufacturing method for producing a multi-channel catheter assembly including an inner catheter having a sufficiently smooth inner surface. For those skilled in the art, after reading the following description of the various embodiments described through various figures, it is clear that the foregoing and other objects and advantages of the present invention will become apparent. Brief description of the figure. Figure 1 shows a partial cross-sectional view of a device (the device is an embodiment consistent with the present invention), and illustrates a method consistent with the present invention. The above method is used to produce a multi-channel catheter. to make.

V 4407 2 2 V. Description of the invention (6) Figure 2 shows a partial cross-sectional view of another device (the above device is another embodiment consistent with the present invention) 'illustrates a method, the above method is used to produce a multi- Channel catheter assembly. FIG. 3 is an exploded perspective view of an inner duct insertion passage and a rake passage, which are used to illustrate the embedding of an inner duct bundle and the raked groove. A step of. Fig. 4 is a cross-sectional view of an inner tube bundle, which is previously manufactured by extrusion. 〃

Figure 5 shows a cross-section view of a pre-made inner tube bundle. The above internal tubes are connected to each other with a flexible connection network. D Figure 6 shows an enlarged ′ to the first! The cross-sectional view indicated by the cut line of the figure is used to explain the above-mentioned step of embedding an inner catheter bundle. Fig. 7 is an enlarged cross-sectional view indicated by the cutting plane line B-β of Fig.}, Which is used to explain the above-mentioned steps of guiding an inner catheter bundle out of the "m groove". Figures 9 and 10 are sectional views of various inner duct insertion passages with different shapes of wearing surfaces. &Amp; Figure 11 is an exploded view of a pair of cooperating molds in an embodiment. The above embodiment is A device in accordance with the present invention, FIG. 12 is a cross-sectional view showing a pair of mutually matching, and circular module with a shape in the embodiment, the above implementation: the device for producing an invention. Η 糸 — 付Figures 13 and 14 '15 show several wave fingers and non-circular die grooves

5. Sectional view of the module of invention description (7). Figure 16 is a front view of a multi-channel catheter assembly, and the multi-channel catheter assembly is made by the device and method of the present invention. DESCRIPTION OF SYMBOLS 100 ~ cross-head die; 200 ~ molding means; 11 ~ outer duct resin passage; 120 ~ release port; 130 ~ inner tube embedding Inner duct insertion passage; 10 ~ inner duct; tube duct; 1 3 1 ~ g ui groove; 1 32 ~ guide ridge; 140 ~ outlet channel ( rake passage), 142-rake; 141 ~ guide groove (143) heating device, raked groove; 20 ~ outer duct; 2 convex part; 22 ~ concave part; 210 ~ Mould; 1210 ~ module; 230 ~ suction chamber; 240 ~ coooling chamber; 211 ~ inner iiner; 212 ~ groove; 213 ~ channel; 214 ~ in Export. A preferred embodiment of the present invention A manufacturing apparatus for a multi-channel catheter assembly includes a cross-head die 100 and a mold means 200 at the same time. FIG. 1 shows the above-mentioned device for continuously producing the above-mentioned multi-channel catheter assembly, which has a cross head die 100 including an outer duct resin passage 110, and a The outlet 12 is used to extrude a molten thermoplastic resin to manufacture a catheter other than the above resin.

Page 10 r 44 07 V. Description of the invention (8) The cross-head die 100 described above further has an inner duct that passes through the inner duct of the outer duct 110 duct insertion passage) 130, which is suitable for feeding a plurality of inner ducts 10 having a considerable length and individually pre-made. According to the manufacturing method provided by the present invention, an inner duct bundle of a considerable length is continuously fed into an inner duct insert ion passage 1 30, while molten polyethylene flows through an outer duct resin Outer duct resin passage 110 is released from a release outlet 120 to squeeze out the outer tube that covers the inner tube bundle i0. The inner catheter 10 is fed before the inner duct insertion passage. The preferred method is to combine or cover the inner catheters 10 so that they are in close contact with each other in parallel to form a catheter bundle. 1. To form the above-mentioned catheter bundle 1, the inner catheter 10 may be connected to each other via a combination of the previously prepared inner catheters 10 as shown in Fig. 4 or an elastic mesh as shown in Fig. 5. Preferably, the inner duct insertion passage 130 described above has a cross-section of a catheter bundle shape, including a plurality of guide grooves 131 and a plurality of guide ridges 132 'the shape of the aforementioned carrying surface It is taken from the contour of the embedded inner tube bundle (the inner tube is closely connected in parallel with each other, as shown in Figure 3) ° The cross section of the inner duct insertion passage 130 above is used to guide Lead the above-mentioned considerable length, plural inner catheter bundles,

Page 11 v 44 07 2 2 V. Description of the invention (9) Insert the inner duct insertion passage 130 in parallel with each other and adjacent to each other. The cross-sectional shape of the inner duct insertion passage 130 described above can be designed differently according to the contours of various inner duct bundles (as shown in Figures 8 to 10). A preferred method is to provide a rakepassage 140, which is connected to the exit of the inner duct insertion passage 130, and has a similarity to the inner duct insertion passage 130 described above. It has a face shape, but a plurality of rakes 142 are additionally provided, which protrude from the center of the guide groove 141 toward the central axis of the lead-out path (as shown in Figs. 3 to 7). A preferred method is to set a heating device 1 4 3 outside the rake passage 140 for preheating the rake passage 140 (as shown in FIG. 3). ). The rake 142 and the heating device 143 are used for preheating the outer surface of the inner tube and leading out a rake shape when the inner tube 10 passes through the inner duct insertion passage. A plurality of raked grooves 11 ° are formed on the outer surface of the inner pipe 10. As shown in FIG. 16, the concave portion of the molten outer pipe and the outer pipe in advance are welded to the inner guide. . Rake groove 11 makes the inner tube made easier (where the outer surface of the upper tube meets)

Page 12 rt 440.5. Description of the invention (10) As shown in Figures 1 and 2, 'When the inner catheter 10 is released from the cross-head die 100, the above is immediately followed by The outer duct 20 extruded from the release port 120 of the cross-head die 100 does not directly contact the outer surface of the inner duct. As shown in Fig. 1 '2', a pre-made inner tube 10 released from a cross head mold (cr0ss_hea (j die) 100) and a molten outer tube are sent to a molding means (molding means) 200. Before that, the outer surface of the outer duct 20 was cooled by cold air introduced around it, so that the outer duct 20 changed from the original molten state to a more stable and softened state. In this way, the outer duct 2 could be avoided. Excessive deformation occurs due to fluidity. As shown in Figure 2, the previously prepared inner tube 10 and the molten outer guide are continuously fed into the mold-making device with a corrugated mold groove ( molding means) 200. The molding device 200 molds, cools, and hardens the outer tube 20 to have a corrugated pipe surface, and has a plurality of continuous convex portions covering the entire length. 21 and recessed portion 22. The recessed portion 22 of the outer tube 20 described above is connected to each other as shown in FIG. 16 / the upper tube 10. A preferred method is to weld the inner tube 10 to the above. The inner surface of the recessed portion and the inner tube 10 The part where the side surfaces meet, " ΪΪ2〇Ϊί Γ groove (η— " U) makes the above-mentioned molten state =: the tube is easier (shown on the concave of the outer pipe above.) The side surface is connected Where) are welded together, as shown in Figure 16 above, the mold making device (m〇Uing means) 20000 mold needs

Page 13 4407 V. Description of the invention (11) The softened outer duct 20 can be shaped, cooled, and hardened to have a wave-like outer shape. Under this premise, a molding means of any structure 200 can be used. Although the present invention has disclosed a variety of molding means (molding means) 200 for producing different types of corrugated plastic pipes, for the sake of convenience, hereinafter, only two kinds of molding means will be described. FIG. 1 shows a mold forming device 200 for manufacturing the above-mentioned corrugated outer catheter 20, which includes a pair of complementary mold sets 210, each of which has a large number and is linked in a string. Module 1210; and a driving device 220, which simultaneously makes two sets of mold assembly 21 0 module 1 2 0 run along a forward path, in which each mold combination 2 1 0 module 1 2 1 0 sprays together to form a A zigzag die groove extending axially and then returned through a recovery path; and a conventional suction chamber 230 is provided at a predetermined position and can be connected to a suction source for When the module runs along the forward road control, the corrugated tunnel is connected: and a standing cooling chamber 240 is provided at a predetermined position, and can be connected to a source of cooling fluid. cooling fluid) for connecting the mold assembly. In FIG. 2, the above-mentioned circular tube-shaped mold 21o includes an inner liner (inner 1 iner) 2 Π, which has a proper amount of pores for allowing fluid (such as air) to pass therethrough. The inner side surface of the inner liner 211 has a wave finger, and a groove 2 1 2 is provided behind the inner liner. Via a channel 21 3 and the outer side of the mold 2 1 0 is provided.

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Import and export 214 are connected. Thus, the pores of the channel 2i3, the groove 212, and the inner liner 211 together constitute a suction channel, which extends through the above-mentioned corrugated mold grooves forming the inner surface of the mold and the above-mentioned appropriate settings. Between the outside of the mold 21 0 and the entrance 21 4. In the molding means 200 of the above structure, the outer duct 20 extruded and softened from the cross-head die 100 is sent to the corrugated die groove of the above die 21, and It is forcibly molded into the groove shape of the mold 210. After the outer tube 20 is fed into the mold, the groove 21 2 surrounding the mold groove of the mold has a suction function. The suction generated by the pores makes the outer tube 20 adhere to the corrugated mold groove. . The coolant flowing around the above-mentioned meandering die groove also cools and hardens the above-mentioned meandering outer pipe 20. As a result, in the manufactured multi-channel catheter assembly, the outer shape of the outer tube 20 was accurately shaped into the shape of the corrugated mold groove, and the inner surface of the concave portion 22 of the outer tube 20 directly contacted, Or welded to the outer surface of the inner catheter 10. The coolant flowing around the mold may be a cooling gas, cooling water 'or the like. Although in a preferred method, the above-mentioned mold 21 0 has a corrugated mold groove and includes a common, accurate circular cross-section; the above mold may also be designed to have a corrugated mold groove and includes a spiral shape. Wearing face. The cross-sectional shape of the corrugated mold groove of the above mold may be rounded quadrangular, square triangle, or elliptical, as shown in Figs. 13 to 15. The present invention is to feed a plurality of prefabricated inner tubes in advance to -10.

苐 Page 15 V. Description of the invention (13) Cross-head die 100 'Simultaneously heat and soften an outer tube 20 from the aforementioned cross-head mold 100 and extrude the inner tube 10 'Then these pre-made inner ducts 10 and molten outer ducts 20 are broken-and sent into a mold 2 10 wave-shaped mold groove, said mold is used to give the outer tube 2 0 wave-shaped. The outer shape, and then a multi-channel 'tube assembly is manufactured, the assembly has a plurality of inner ducts i 0 and a corrugated outer duct 20 for receiving the inner duct 10, which is wrapped around the entire length.逑 内 导管 10. The above method _ uses an extrusion and casting machine ^ extrusion molding machine) to continuously produce more than one through --h cross-head die 100 and a molding means 200 Channel Catheter Assembly-has not yet appeared in conventional technology. An example will be described below on how to make a multi-channel catheter assembly using the present invention. Five pre-made polyethylene inner catheters 10 were fed, and the inner catheter 1Q was fed into the cross-head die 100 described above before the inner duct insertion passage 130. Combine them into a catheter bundle so that the tubes are parallel and tightly connected to each other, as shown in Figures 1 to 3. When the inner tube 10 passes through the inner duct insertion passage 130 a, the outer surface of the inner tube is preheated and the rake groove is led out to make it easier to weld to the recess 22 of the outer tube 20, such as Figure 7 shows. The above-mentioned length of the catheter bundle is continuously fed into the inner duct insertion passage 130 described above, while molten polyethylene flows through an outer catheter resin

Page 16 4407 2 2 Continuously feeds the upper and outer ducts 20 to the mold 210. , Cooling, and covering the full length of the total number of multiple-channel ducts, each covering the entire length of the device provided by the above-mentioned inner guide, in the present invention is explained in detail in the passage 110 by the present invention, from a release outlet 12 above the above The inner catheter bundle 10 and the outer catheter, as described in the fifth lambda invention (14), the outer duct res (released from the outer duct res, is used to squeeze out the coating as shown in Figures 1 to 3. As shown in Figures 1 to 3, The above-mentioned molten, softened vacuum-type outer tube 20 is shaped to have a continuous tube surface. The figure 16 shows a multi-device and method of manufacturing, including the inner tube 10; and A folded outer catheter 20 is used to ensure that the above-mentioned official assembly through the present invention is also better than the conventional technology. Therefore, 'the above-mentioned multi-channel catheter assembly structure is shown in its diagram. Although the present invention has been modified with any changes It is easy to see and understand the action. Therefore, in accordance with the spirit and scope of the present invention, the inner tube 10 made in advance is inserted into a mold 210 with a corrugated mold groove, and is hardened to have a wave Fold-shaped number of convex parts 2〗 and concave parts 22. The invention is based on the relationship that the wave tubes 10 of the inner tube surrounded by the above-mentioned inner tubes are parallel to each other and closely connected with each other. And the patent for the method of manufacturing is separately applied for the multi-channel guidance. The proposed device and method of manufacturing ' The examples that are not included in this description and description are as above, and it is expected that those skilled in this art will undoubtedly belong to the obvious line to cover the above-mentioned movements and retouches with the scope of patent applications.

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Claims (1)

6. Scope of patent application j. A manufacturing device for a multi-channel catheter assembly 'includes: (a) a cross-head mold with an outer duct resin flow channel and a release port for extruding molten thermoplastic resin to Manufacture of the outer tube made of the above-mentioned resin, the cross-head pound mold further has an inner tube embedding channel 'applicable to a plurality of pre-made inner tubes passing through the center of the outer guide resin resin flow channel; and' (b ) —Molding device for casting a corrugated outer tube, including: a mold with a corrugated mold groove and a drive device for driving the mold; a standing suction chamber set in a predetermined Position, which can be connected to a suction source to connect the above-mentioned wave-shaped mold groove; and a standing cooling device, which is set at a predetermined position, can be connected to a coolant source to connect the above township assembly; (c) The above-mentioned inner catheter embedding prop has a cross-section of the shape of a catheter bundle, including a plurality of guide grooves and a plurality of guide ridges. The shape of the above-mentioned cross-section is taken from the outline of the embedded inner catheter bundle (the inner catheters are flat with each other Lines are closely connected). 2. The manufacturing method of the multi-channel catheter assembly as described in item 1 of the scope of the patent application, which further has a rake-shaped groove lead-out channel 'connected to the exit of the above-mentioned inner catheter entry channel, which is similar to the above-mentioned inner catheter insertion channel The cross-sectional shape has a plurality of handle-shaped portions that protrude from the center of the guide groove to the central axis of the upper block lead-out track. 3. The manufacturing method of the multi-channel catheter assembly according to item 2 of the scope of the patent application, further comprising a heating device provided outside the above-mentioned rake-shaped channel to preheat the rake-shaped channel. Page 18 The multi-channel conduit assembly described in item 1 of the patent scope of the manufacturing department # The right two sheds ^ The above-mentioned molds are a pair of complementary mold combinations, each of which is f. Large branch grooves, and the above-mentioned assembly has a large number of , Link into a series of descriptions and combinations. 5. The multi-channel catheter assembly according to item 1 of the claim 5 patent scope < manufacturing device ' wherein the mold is a circular tube mold and is provided with a positioner to rotatably support the mold, and The inner surface of the mold is provided with a spiral wave-shaped mold groove, which passes through the center of the mold. 6 'The multi-channel catheter assembly manufacturing device according to item 1 of the patent application scope, wherein the corrugated mold groove has a substantially circular section 7. The multi-channel as described in the first patent application scope The catheter assembly is a manufacturing device, wherein the corrugated mold groove has a substantially oval surface. 8. The multi-channel catheter assembly cost manufacturing device according to item 1 of the scope of the patent application, wherein the corrugated mold groove has a substantially rounded triangular cross section. 9. The multi-channel catheter assembly g manufacturing device according to item 1 of the scope of the patent application, wherein the above-mentioned corrugated mold groove has a substantially rounded four-sided cross section 11 1 0.—the manufacturing method of the multi-channel catheter assembly, Including: (a) a plurality of prefabricated inner ducts are closely adjacent to each other in parallel to form a duct bundle; (b) continuously feeding a considerable length of inner duct bundles into one; embedding the channel while making the molten state Polyethylene flow through-Resin flow core of the outer tube is made of multiple side surfaces. ) System cut) system shape) system shape ί phase L pipe, 4 ^ 〇7 22 Six 'out of the patent application, the release is released, used to extrude the officer covering the above-mentioned inner tube bundle', c Continuously the above-mentioned pre-made inner tube and the upper and outer The catheter is fed into a vacuum mold with a corrugated mold groove; 1 (d) forming and cooling the above-mentioned graft-shaped outer duct in the mold with a corrugated mold groove and hardening the outer mold; The catheter 7 has a corrugated tube surface (including a plurality of convex portions and concave portions covering the entire length). '11 · The method for manufacturing a multi-channel catheter assembly as described in item 10 of the scope of patent application, further comprising a step of heating the outer side of the inner catheter when the pre-made inner catheter is inserted into the channel through the inner catheter. Surface 2 (12. The method for manufacturing a multi-channel catheter assembly as described in item 11 of the scope of patent application, which further includes a step: when the pre-made inner catheter is inserted into the channel through the inner catheter, The outer surface leads to a rake groove. Page 20