One-time forming multi-cavity rubber head guide pipe pressing die

Abstract

The invention discloses a one-time forming multi-cavity rubber head guide pipe pressing die which comprises an upper die, a lower die and a rubber head guide pipe, the upper die and the lower die are matched to form a plurality of cavities, the rubber head guide pipe comprises a silica gel pipe body and a cavity head, and the silica gel pipe body is provided with a plurality of cavities communicated with the cavity head. A rubber head catheter, a urinary catheterization cavity core rod, a center cavity core rod assembly and a balloon cavity core rod are contained in the cavities respectively, the tail ends of the urinary catheterization cavity core rod, the tail end of the center cavity core rod assembly and the tail end of the balloon cavity core rod are inserted into the cavity channels respectively, and the center cavity core rod assembly comprises a center cavity core rod and a center cavity outer sleeve arranged on the center cavity core rod in a sleeving mode. A plurality of bending grooves are formed in the center cavity outer sleeve, a plurality of core needle holes are axially distributed in the circumference of the center cavity outer sleeve, and water inlet and outlet cavity core needles are arranged in the core needle holes. The problem that the multi-cavity rubber head catheter is difficult to form is solved.

Description

Technical Field

[0001] The invention relates to the field of molds, and in particular to a one-time molding multi-cavity rubber-head catheter pressing mold. Background Art

[0002] Generally, there are two types of silicone rubber-tipped catheter pressing molds: solid silicone pressing molds and liquid silicone pressing molds. Generally, when the silicone tube body has no more than four cavities and the cavities of the silicone tube body and the cavity head are required to be continuous, a general solid silicone pressing mold can be used. That is, the mold has four cavities to press the silicone rubber-tipped catheter with four cavities. However, when the silicone tube body has more than four cavities, ordinary solid silicone pressing molds cannot be used to complete the pressing in one go. Summary of the Invention

[0003] In view of the above-mentioned deficiencies of the current one-time molding die for multi-cavity rubber-tipped catheters, the present invention can realize one-time molding of multi-cavity rubber-tipped catheters.

[0004] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions: A disposable multi-cavity rubber-tipped catheter pressing mold comprises an upper mold, a lower mold and a rubber-tipped catheter, the upper mold and the lower mold cooperate to form a plurality of cavities, the rubber-tipped catheter comprises a silicone tube body and a cavity head, the silicone tube body is provided with a plurality of cavities which pass through the cavity head, the cavities respectively accommodate a rubber-tipped catheter, a catheter cavity core rod, a center cavity core rod assembly and a balloon cavity core rod, the tail ends of the catheter cavity core rod, the center cavity core rod assembly and the balloon cavity core rod are respectively inserted into the cavities, the center cavity core rod assembly comprises a center cavity core rod and a center cavity jacket sleeved on the center cavity core rod, the center cavity jacket is provided with a plurality of bending grooves inside, the center cavity jacket is provided with a plurality of core pin holes axially arranged on the circumference, the core pin hole is provided with a water inlet and outlet core pin, and the water inlet and outlet core pin can rotate in the core pin hole.

[0005] According to one aspect of the present invention, the water inlet and outlet cavity core needles are arranged in parallel around the central axis of the central cavity core rod.

[0006] According to one aspect of the present invention, the water inlet and outlet cavity core needles are arranged in a circumferential stepped manner around the central axis of the central cavity core rod.

[0007] According to one aspect of the present invention, there is a preset difference in the lengths of adjacent core needles of the water inlet and outlet chambers.

[0008] According to one aspect of the present invention, the preset difference between adjacent water inlet and outlet core needles is 4 mm, and the length difference between the longest water inlet and outlet core needle and the shortest water inlet and outlet core needle is 28 mm.

[0009] According to one aspect of the present invention, one end of the water inlet and outlet core needle is a round head, and the other end of the water inlet and outlet core needle is a flat head. The end of the water inlet and outlet core needle close to the flat head is bent outward and arranged in the bending groove of the central cavity sleeve.

[0010] According to one aspect of the present invention, the lower mold is provided with a positioning pin.

[0011] According to one aspect of the present invention, the lower die is provided with a core rod positioning pin.

[0012] According to one aspect of the present invention, a core sleeve positioning pin is provided between the central cavity core rod and the central cavity sleeve.

[0013] According to one aspect of the present invention, the cavity includes a urinary catheter cavity, a balloon cavity, a central cavity and eight water inlet and outlet cavities for inserting water inlet and outlet core needles. The urinary catheter cavity is used for inserting the urinary catheter cavity core rod, and the balloon cavity is used for inserting the balloon cavity core rod.

[0014] Advantages of the implementation of the present invention: When the number of cavities is not less than 4, it is difficult for the existing mold to have enough space to place the water inlet and outlet core needles, which makes it difficult for the multi-cavity rubber head catheter to be formed through the existing mold. Therefore, the present invention solves the problem of the difficulty in forming the multi-cavity rubber head catheter by embedding multiple water inlet and outlet core needles with the central cavity core rod; the water inlet and outlet core needles are arranged in a circular stepped manner around the central axis of the central cavity core rod, thereby improving the insertion efficiency of the water inlet and outlet core needles. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 is a cross-sectional view of the mold of the present invention; Figure 2 Schematic diagram of a comparative example; Figure 3 A top view of the lower mold of the present invention; Figure 4 for Figure 3 Schematic diagram of BB direction; Figure 5 This is a schematic structural diagram of the central cavity core rod assembly of the present invention; Figure 6 for Figure 5 Schematic diagram of CC direction; Figure 7 A schematic diagram of the rubber-tipped catheter of the present invention; Figure 8 for Figure 7 Schematic diagram of the AA direction.

[0017] 1. Upper mold; 2. Positioning pin; 3. Catheterization cavity core rod; 4. Center cavity core rod assembly; 41. Water inlet and outlet cavity core needle; 411. First water inlet and outlet cavity core needle; 412. Eighth water inlet and outlet cavity core needle; 42. Center cavity core rod; 43. Center cavity outer sleeve; 44. Core sleeve positioning pin; 45. Bending groove; 5. Balloon cavity core rod; 6. Lower mold; 7. Core rod positioning pin; 8. Rubber-tipped catheter; 81. Silicone tube body; 82. Cavity head; 9. Cavity; 91. Catheterization cavity; 92. Balloon cavity; 93. Water inlet and outlet cavity; 94. Center cavity. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] Comparative Example: Existing silicone rubber head catheter pressing molds such as Figure 2 As shown, a cavity 9 is opened in the silicone rubber-tipped catheter 8, and the cavity 9 includes a central cavity 94, a urinary catheter cavity 91 and a balloon cavity 92. When in use, it is necessary to insert the central cavity core rod 42 into the central cavity 94, the urinary catheter cavity core rod 3 into the urinary catheter cavity 91, and the balloon cavity core rod 5 into the balloon cavity 92 one by one, and then place the assembled silicone rubber-tipped catheter 8 on a pressing mold for pressing.

[0020] Example 1

[0021] like Figure 1 、 Figures 3 to 8As shown, a disposable molding multi-cavity rubber head catheter pressing mold includes an upper mold 1, a lower mold 6 and a rubber head catheter 8. The upper mold 1 and the lower mold 6 cooperate to form a plurality of cavities. The rubber head catheter 8 includes a silicone tube body 81 and a cavity head 82. The silicone tube body is provided with a plurality of cavities 9 that pass through the cavity head 82. The cavity respectively accommodates the rubber head catheter 8, the catheterization cavity core rod 3, the center cavity core rod assembly 4 and the balloon cavity core rod 5. The tail ends of the catheterization cavity core rod 3, the center cavity core rod assembly 4 and the balloon cavity core rod 5 are respectively inserted into the cavity 9. The center cavity core rod assembly 4 includes a center cavity core rod 42 and a center cavity jacket 43 sleeved on the center cavity core rod 42. The center cavity jacket 43 is provided with a plurality of bending grooves 45 inside. The center cavity jacket 43 is provided with a plurality of core pin holes in the circumferential axial direction. The core pin hole is provided with a water inlet and outlet cavity core pin 41, and the water inlet and outlet cavity core pin 41 can rotate in the core pin hole. Before pressing, after the catheter cavity core rod 3, the central cavity core rod assembly 4 and the balloon cavity core rod 5 are placed in the specified cavity position of the lower mold 6, the upper mold 1 is aligned with the three positioning pins 2 and gently placed on the upper surface of the lower mold 6.

[0022] In practice, one end of the water inlet and outlet core needle 41 is rounded, and the other end is flat. The end of the water inlet and outlet core needle 41, closest to the flat end, is bent outward at 90° and positioned within the bending groove 45 of the center cavity sleeve 43. The bending groove 45 engages the water inlet and outlet core needle 41, securing it to the center cavity core rod 42. This allows for simultaneous insertion into the cavity 9 of the silicone tube body. During removal, the center cavity core rod 42 and the water inlet and outlet core needle 41 can be removed together, eliminating the need for separate removal.

[0023] like Figure 6 As shown, in actual application, the water inlet and outlet cavity core needles 41 are arranged in parallel around the central axis of the central cavity core rod 42. When in use, the water inlet and outlet cavity core needles 41 are aligned with the cavity 9 for insertion.

[0024] like Figure 6 As shown, there are eight water inlet and outlet core needles. The first water inlet and outlet core needle 411 is at the ten o'clock position on the circumference, and the remaining water inlet and outlet core needles are arranged in a clockwise direction. The eighth water inlet and outlet core needle 412 is at the seven o'clock position on the circumference. The first water inlet and outlet core needle 411 is the shortest, and the eighth water inlet and outlet core needle 412 is the longest.

[0025] like Figure 1 and Figure 3 As shown, in actual application, the lower mold 6 is provided with a positioning pin 2 and a core rod positioning pin 7. The lower mold 6 is provided with three positioning pins 2 and is tightly mounted, and two core rod positioning pins 7 are also tightly mounted. A catheter cavity core rod 3 and a balloon cavity core rod 5 are placed in the corresponding cavity of the lower mold 6 and fixed in the cavity of the lower mold 6 by the two core rod positioning pins 7, ensuring that the catheter cavity core rod 3 and the balloon cavity core rod 5 do not shift in the cavity.

[0026] In actual application, a core sleeve positioning pin 44 is provided between the central cavity core rod 42 and the central cavity sleeve 43. The central cavity core rod assembly 4 is fixed to the position of the cavity specified by the lower mold 6 by the core sleeve positioning pin 44 to ensure that it does not shift.

[0027] In actual use, the lumen 9 includes a urinary catheter lumen 91, a balloon lumen 92, a water inlet and outlet lumen 93 for inserting the water inlet and outlet core needle 41, and a central lumen 94. The urinary catheter lumen 91 is used to insert the urinary catheter core rod 3, and the balloon lumen 92 is used to insert the balloon core rod 5. All lumens 9 on the lumen head 82 correspond to all lumens 9 on the silicone catheter and are interconnected.

[0028] The central cavity outer sleeve 43 and the central cavity core rod 42 are coaxially clearance-fitted.

[0029] The following process is used to press the rubber-tipped catheter 8. Before pressing the finished rubber-tipped catheter 8, a silicone tubing (finished product) of a certain length is prepared. First, the water inlet and outlet core needles 41 and the central cavity core rod 42 of the central cavity core rod assembly 4 are inserted into the corresponding cavities 9 of the silicone tubing. Next, the urinary catheter core rod 3 is inserted into the corresponding cavities 9 of the silicone tubing. Finally, the balloon cavity core rod 5 is inserted into the corresponding cavities 9 of the silicone tubing. After completion, the tubing is placed together into the corresponding cavities of the lower mold 6, with the core rod locating pins 7 inserted into the corresponding holes of the urinary catheter core rod 3 and the balloon cavity core rod 5. Furthermore, the core sleeve locating pins 44 of the central cavity core rod assembly 4 are inserted into the corresponding grooves of the lower mold 6.

[0030] After completing the above steps, according to the conventional solid silicone pressing mold operation method, a certain amount of solid silicone rubber is placed on the upper surface of the lower mold 6, the catheter cavity core rod 3, the balloon cavity core rod 5 and the central cavity core rod assembly 4, and then the upper mold 1 is closed. After the mold is closed, the rubber head catheter 8 is pressed under heating and pressure according to the process regulations, that is, the product rubber head catheter 8 is completed in one-time pressing.

[0031] Example 2

[0032] like Figure 1 、 Figures 3 to 8As shown, a disposable multi-cavity rubber-tipped catheter pressing mold includes an upper mold 1, a lower mold 6, and a rubber-tipped catheter 8. The upper mold 1 and the lower mold 6 cooperate to form a plurality of cavities. The rubber-tipped catheter 8 includes a silicone tube body 81 and a cavity head 82. The silicone tube body is provided with a plurality of cavities 9 that pass through the cavity head 82. The cavities respectively accommodate the rubber-tipped catheter 8, the catheter cavity core rod 3, the center cavity core rod assembly 4, and the balloon cavity core rod 5. The tail ends of the catheter cavity core rod 3, the center cavity core rod assembly 4, and the balloon cavity core rod 5 are respectively inserted into the cavities 9. The center cavity core rod assembly 4 includes a center cavity core rod 42 and a center cavity outer sleeve 43 sleeved on the center cavity core rod 42. The center cavity outer sleeve 43 is provided with a plurality of bending grooves 45 inside. The center cavity outer sleeve 43 is provided with a plurality of core needle holes in the circumferential axial direction. The core needle hole is provided with an inlet and outlet water cavity core needle 41. The inlet and outlet water cavity core needle 41 can rotate in the core needle hole. The inlet and outlet water cavity core needle 41 is arranged in a circumferential step around the center axis of the center cavity core rod 42, and there is a preset difference in the length of adjacent inlet and outlet water cavity core needles 41. Compared with Example 1, the inlet and outlet water cavity core needles 41 of the present application are arranged in a circumferential step around the center axis of the center cavity core rod 42. Since the inlet and outlet water cavity core needle 41 itself has an angle, in order to enable one end of the inlet and outlet water cavity core needle 41 to be inserted into the tube body and the other end to be fixed on the core sleeve, a circumferential step arrangement is adopted to allow the inlet and outlet water cavity core needle 41 with the shortest length (such as Figure 7 1 needle) is inserted first, so that the longest water inlet and outlet core needle 41 (such as Figure 7 The 8 needles in the water cavity are inserted last, so that the core needles 41 in and out of the water cavity can be inserted efficiently, which is more efficient than the parallel insertion in embodiment 1.

[0033] Before pressing, after the catheter cavity core rod 3, the central cavity core rod assembly 4 and the balloon cavity core rod 5 are placed in the specified cavity position of the lower mold 6, the upper mold 1 is aligned with the three positioning pins 2 and gently placed on the upper surface of the lower mold 6.

[0034] In practice, one end of the water inlet and outlet core needle 41 is rounded, and the other end is flat. The end of the water inlet and outlet core needle 41, closest to the flat end, is bent outward at 90 degrees and positioned within a bending groove 45 of the center cavity housing 43. The bending groove 45 engages the water inlet and outlet core needle 41, securing it to the center cavity core rod 42. This allows the core needle 41 and the center cavity core rod 42 to be removed together during disassembly, eliminating the need for separate removal.

[0035] In actual application, the lower mold 6 is provided with positioning pins 2 and core rod positioning pins 7. The lower mold 6 is provided with three positioning pins 2 and is tightly mounted, and two core rod positioning pins 7 are tightly mounted. A catheter cavity core rod 3 and a balloon cavity core rod 5 are placed in the corresponding cavity of the lower mold 6 and fixed in the cavity of the lower mold 6 by the two core rod positioning pins 7, ensuring that the catheter cavity core rod 3 and the balloon cavity core rod 5 do not shift in the cavity.

[0036] In actual application, a core sleeve positioning pin 44 is provided between the central cavity core rod 42 and the central cavity sleeve 43. The central cavity core rod assembly 4 is fixed to the position of the cavity specified by the lower mold 6 by the core sleeve positioning pin 44 to ensure that it does not shift.

[0037] In this embodiment, the lumens 9 include a urinary catheter lumen 91, a balloon lumen 92, eight water inlet and outlet lumens 93 for inserting the water inlet and outlet core needles 41, and a central lumen 94 for inserting the central lumen core rod 42. The urinary catheter lumen 91 is used to insert the urinary catheter core rod 3, and the balloon lumen 92 is used to insert the balloon core rod 5. All lumens 9 on the lumen head 82 correspond one-to-one to all lumens 9 on the silicone catheter and are interconnected.

[0038] In this embodiment, the central cavity outer sleeve 43 and the central cavity core rod 42 are coaxially clearance-fitted, and eight water inlet and outlet core needles 41 are evenly distributed on the central cavity outer sleeve 43 and clearance-fitted.

[0039] In this embodiment, the preset difference between the adjacent water inlet and outlet core needles 41 is 4 mm, and the length difference between the longest water inlet and outlet core needle 41 and the shortest water inlet and outlet core needle 41 is 28 mm.

[0040] In this embodiment, the water inlet and outlet cavity core needle 41 includes a parallel section and an inclined section, and the angle between the parallel section and the inclined section is 177.4°.

[0041] In this embodiment, the inner diameter of the water inlet and outlet lumen 93 is no greater than 0.7 mm, and the inner diameters of the urinary catheter lumen 91 , the balloon lumen 92 , and the central lumen 94 are all greater than 0.7 mm.

[0042] The process of assembling the central cavity core rod 42: first, select the flat end of the water inlet and outlet cavity core needle 41 with the shortest length and insert it into the core needle hole of the central cavity jacket 43 until it extends out of the end face of the central cavity jacket 43. Then select a water inlet and outlet cavity core needle 41 that is 4 mm longer than the previous one and insert it into the core needle hole adjacent to the water inlet and outlet cavity core needle 41 until it extends out of the end face of the central cavity jacket 43. In this way, insert eight water inlet and outlet cavity core needles 41 until all of them are inserted into the core needle holes of the central cavity jacket 43.

[0043] Using specialized tooling, insert the eight water inlet and outlet core needles 41, each with a 3mm taper and a R0.2mm rounded end, in a stepped arrangement. The parallel sections are arranged axially parallel to each other, ensuring that the central circumference diameter of the eight water inlet and outlet core needles 41 is ∅4.5, which is the same as the corresponding diameter of the silicone tube body. This ensures that the central cavity core rod assembly 4 is easily inserted into the silicone tube body. Once the placement and angle of the eight water inlet and outlet core needles 41 meet the requirements, install the locking nut at the end of the central cavity sleeve 43 to ensure that the eight water inlet and outlet core needles 41 do not shift.

[0044] The following process is used to press the rubber-tipped catheter 8: Before pressing the finished rubber-tipped catheter 8, a silicone tube body (finished product) of a certain length is prepared. The silicone tube body has 11 cavities 9, including a urinary catheter channel 91, eight water inlet and outlet channels 93, a central channel 94, and a balloon channel 92. First, the eight water inlet and outlet core needles 41 and the central channel core rod 42 of the central channel core rod assembly 4 are inserted into the corresponding cavities 9 of the silicone tube body. Then, the urinary catheter core rod 3 is inserted into the corresponding cavities 9 of the silicone tube body. Finally, the balloon core rod 5 is inserted into the corresponding cavities 9 of the silicone tube body. After completion, the tubes are placed together into the corresponding cavities of the lower mold 6, with the core rod locating pins 7 inserted into the corresponding holes of the urinary catheter core rod 3 and the balloon core rod 5, and the core sleeve locating pins 44 of the central channel core rod assembly 4 are embedded in the corresponding grooves of the lower mold 6.

[0045] After completing the above steps, according to the conventional solid silicone pressing mold operation method, a certain amount of solid silicone rubber is placed on the upper surface of the lower mold 6, the catheter cavity core rod 3, the balloon cavity core rod 5 and the central cavity core rod assembly 4, and then the upper mold 1 is closed. After the mold is closed, the rubber head catheter 8 is pressed under heating and pressure according to the process regulations, that is, the product rubber head catheter 8 is completed in one-time pressing.

[0046] The effective effect of the present invention is: when the cavity 9 is not less than 4, the existing mold (such as Figure 2 As shown in the figure, it is difficult to have enough space to place the water inlet and outlet cavity core needles 41, which makes it difficult for the multi-cavity rubber head catheter 8 to be formed through the existing mold. Therefore, the present invention solves the problem of the multi-cavity rubber head catheter 8 being difficult to form by embedding multiple water inlet and outlet cavity core needles 41 with the central cavity core rod 42; the water inlet and outlet cavity core needles 41 are arranged in a circular stepped manner around the central axis of the central cavity core rod 42, thereby improving the insertion efficiency of the water inlet and outlet cavity core needles 41.

[0047] The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A one-time molding multi-cavity rubber head catheter pressing die, comprising an upper die (1), a lower die (6) and a rubber head catheter (8), characterized in that: The upper mold (1) and the lower mold (6) cooperate to form a plurality of cavities. The rubber-tipped catheter (8) comprises a silicone tube body (81) and a cavity head (82). The silicone tube body is provided with a plurality of cavities (9) that pass through the cavity head (82). The cavities respectively accommodate the rubber-tipped catheter (8), the catheter cavity core rod (3), the central cavity core rod assembly (4) and the balloon cavity core rod (5). The catheter cavity core rod (3), the central cavity core rod assembly (4) and the balloon cavity core rod (5) The tail ends of the central cavity core rod assembly (4) are respectively inserted into the cavity (9), and the central cavity core rod assembly (4) includes a central cavity core rod (42) and a central cavity outer sleeve (43) sleeved on the central cavity core rod (42), wherein a plurality of bending grooves (45) are provided inside the central cavity outer sleeve (43), and a plurality of core needle holes are arranged in the circumferential axial direction of the central cavity outer sleeve (43), and an inlet and outlet water cavity core needle (41) is provided in the core needle hole, and the inlet and outlet water cavity core needle (41) can rotate in the core needle hole.

2. The disposable multi-cavity rubber-head catheter pressing die according to claim 1, characterized in that: The water inlet and outlet cavity core needles (41) are arranged in parallel around the central axis of the central cavity core rod (42).

3. The disposable multi-cavity rubber-tipped catheter pressing die according to claim 1, characterized in that: The water inlet and outlet cavity core needles (41) are arranged in a circumferential stepped manner around the central axis of the central cavity core rod (42).

4. The disposable multi-cavity rubber-tipped catheter pressing die according to claim 3, characterized in that: There is a preset difference in the lengths of adjacent water inlet and outlet chamber core needles (41).

5. The disposable multi-cavity rubber-tipped catheter pressing die according to claim 4, characterized in that: The preset difference between adjacent water inlet and outlet cavity core needles (41) is 4 mm, and the length difference between the longest water inlet and outlet cavity core needle (41) and the shortest water inlet and outlet cavity core needle (41) is 28 mm.

6. The disposable multi-cavity rubber-tipped catheter pressing die according to claim 1, characterized in that: One end of the water inlet and outlet cavity core needle (41) is a round head, and the other end of the water inlet and outlet cavity core needle (41) is a flat head. The end of the water inlet and outlet cavity core needle (41) close to the flat head is bent outward and arranged in the bending groove (45) of the central cavity jacket (43).

7. The disposable multi-cavity rubber-tipped catheter pressing die according to claim 1, characterized in that: The lower die (6) is provided with a positioning pin (2).

8. The disposable multi-cavity rubber-tipped catheter pressing die according to claim 1, characterized in that: The lower die (6) is provided with a core rod positioning pin (7).

9. The disposable multi-cavity rubber-tipped catheter pressing die according to claim 1, characterized in that: A core sleeve positioning pin (44) is provided between the central cavity core rod (42) and the central cavity sleeve (43).

10. The disposable multi-cavity rubber-tipped catheter pressing die according to any one of claims 1 to 9, characterized in that: The cavity (9) comprises a urinary catheter cavity (91), a balloon cavity (92), a central cavity (94), and eight water inlet and outlet cavities (93) for inserting water inlet and outlet core needles (41). The urinary catheter cavity (91) is used for inserting the urinary catheter cavity core rod (3), and the balloon cavity (92) is used for inserting the balloon cavity core rod (5).

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