Extrusion molding core rod for producing easy-to-tear pipe and easy-to-tear pipe

By designing an extruded core rod with symmetrical protrusions and U-shaped grooves, an easy-to-tear pipe with symmetrical gaps is solved, and the existing pipes are easily tear-opened and the cracks are uneven when tearing are achieved, achieving the effect of easy tear-opening and uniform cracks.

CN222959151UActive Publication Date: 2025-06-10TIANJIN JIAAO MEDICAL DEVICES CO LTD
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Patent Information

Application Number
CN202421989100.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-08-16
Publication Date
2025-06-10
Estimated Expiration
2034-08-16

AI Technical Summary

Technical Problem

The tearable tubes in the existing tear-type vascular sheath assembly require a large force when tearing, and the cracks during tear are uneven and uneven.

Method used

An extruded mandrel including a connecting section, a cylindrical section, a conical section and an extrusion section is designed. The extrusion section has a symmetrical protrusion and a U-shaped groove along the central axis to form a symmetrical groove defect structure. Through this structure, a symmetrical gap is formed when the conduit is formed, which is convenient and easy to tear.

Benefits of technology

It realizes that the catheter can be easily teared along symmetric defects after use, and the force is small and the cracks are uniform and flat when tearing it, which is suitable for mass production of easy-to-tear pipes.

✦ Generated by Eureka AI based on patent content.

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Abstract

The extrusion molding core rod comprises a connecting section, a cylindrical section, a conical section and an extrusion section which are connected in sequence, the whole extrusion section is cylindrical, protrusions which are symmetrical along the middle axis of the extrusion section are arranged on the two sides of the outer surface of the extrusion section, U-shaped grooves are formed in the two sides of each protrusion, and the U-shaped grooves are formed in the two sides of the outer surface of the extrusion section. And an extrusion channel penetrating through the extrusion section along the axis direction of the extrusion section is arranged in the extrusion section. According to the utility model, the outer surface of the extrusion section of the core rod is provided with the two groove bulge structures which are symmetrical along the central axis of the core rod, and the forming gap for forming the plastic pipe is formed between the groove bulge structures and the inner hole of the extrusion molding die, so that in the extrusion molding process of the guide pipe, when polymer melt flows through the forming gap, the plastic pipe can be formed by the special groove bulge structures; the two symmetrical notches are formed in the catheter, the catheter can be easily torn off along the two symmetrical notches after being used, good application prospects are achieved in the mass production of the tearable catheter, the efficiency of preparing the pipe easy to tear is high, and the product is easy to tear and convenient to use.
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Description

Technical Field

[0001] The utility model relates to the technical fields of extrusion mandrels and medical devices, in particular to an extrusion mandrel for producing easily tearable pipes and an easily tearable pipe. Background Art

[0002] The medical tearable vascular sheath assembly includes a tearable pipe. During the interventional treatment process, it needs to be torn after use. However, the existing tearable pipes in the tearable vascular sheath assembly are usually simple slender pipes. Due to their tubular structure and the action of stress, a relatively large force is required when tearing. Summary of the Utility Model

[0003] For this reason, an object of the present utility model is to provide an extrusion mandrel for producing easily tearable pipes and an easily tearable pipe to solve the problems mentioned in the background art and overcome the deficiencies in the prior art.

[0004] To achieve the above object, the present utility model adopts the following technical solutions:

[0005] An extrusion mandrel for producing easily tearable pipes, comprising a connecting section, a cylindrical section, a conical section and an extrusion section connected in sequence. The extrusion section is integrally cylindrical. On both sides of the outer surface of the extrusion section, there are protrusions symmetrically arranged along the central axis of the extrusion section. On both sides of the protrusions, there are U-shaped grooves. An extrusion channel is arranged in the extrusion section and runs through the extrusion section along the central axis direction of the extrusion section.

[0006] Further, both the connecting section and the cylindrical section are cylindrical, and the conical section is conical.

[0007] Further, a connecting channel, a cylindrical channel and a conical channel are arranged in the mandrel. One end of the connecting channel is connected to one end of the cylindrical channel, the other end of the cylindrical channel is connected to one end of the conical channel, and the other end of the conical channel is connected to one end of the extrusion channel.

[0008] Further, one end of the extrusion channel extends into the conical section, one end of the conical channel extends into the cylindrical section, and one end of the connecting channel extends into the cylindrical section.

[0009] Further, the height of the protrusion is greater than the depth of the U-shaped groove.

[0010] Further, the connecting section, the cylindrical section, the conical section and the extrusion section are integrated.

[0011] Further, the connecting section, the cylindrical section, the conical section and the extrusion section are coaxially arranged.

[0012] Further, the connecting channel, the cylindrical channel, the conical channel, and the extrusion channel are coaxially arranged.

[0013] The present utility model also provides an easily tearable pipe, including a catheter tube body. Two slits are provided on the inner surface of the catheter tube body along the axial direction of the catheter tube body. There are two slits, and the two slits are oppositely arranged on the inner surface of the catheter tube body.

[0014] Therefore, the present utility model has the following beneficial effects:

[0015] For the extrusion mandrel for producing an easily tearable pipe of the present utility model, two groove and protrusion structures symmetrical about the axis of the mandrel are provided on the outer surface of the extrusion section of the mandrel. A forming gap for forming a plastic pipe is formed between this part and the inner hole of the extrusion die. When the polymer melt flows through here for forming, it will present a tubular structure with two symmetrical groove defects.

[0016] During the extrusion process of the catheter of the present utility model, due to its special groove and protrusion structure, two symmetrical defect structures are presented on the catheter. After the catheter is used, it can be easily torn along the two symmetrical defects, and it has a good application prospect in the mass production of tearable catheters.

[0017] The present utility model can be used for mass-producing easily tearable pipes. Using it to prepare easily tearable pipes is efficient and the products are easy to tear and convenient to use.

[0018] The additional aspects and advantages of the present utility model will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present utility model. Description of the Drawings

[0019] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0020] Figure 1 is an axonometric view of the extrusion mandrel of the present utility model;

[0021] Figure 2 is a front view of the extrusion mandrel of the present utility model;

[0022] Figure 3 is Figure 2 the A-A cross-sectional view shown;

[0023] Figure 4 is an enlarged view of the extrusion section of the extrusion mandrel of the present utility model;

[0024] Figure 5 is a bottom view of the extrusion section of the extrusion mandrel of the present utility model;

[0025] Figure 6Is an axonometric view of an easily tearable pipe produced by the extrusion mandrel of the present utility model;

[0026] Figure 7 Is a side view of an easily tearable pipe produced by the extrusion mandrel of the present utility model.

[0027] In the figure: 1, connecting section; 2, cylindrical section; 3, conical section; 4, extrusion section; 5, protrusion; 6, U-shaped groove; 7, connecting channel; 8, cylindrical channel; 9, conical channel; 10, extrusion channel; 11, notch; 12, catheter tube body. Specific embodiments

[0028] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present utility model, and should not be construed as limiting the present utility model.

[0029] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] As Figures 1 - 5 shown, an extrusion mandrel for producing an easily tearable pipe includes a connecting section 1, a cylindrical section 2, a conical section 3, and an extrusion section 4 connected in sequence. The extrusion section 4 is integrally cylindrical, and two protrusions 5 symmetrical about the axis of the extrusion section 4 are provided on both sides of the outer surface of the extrusion section 4. U-shaped grooves 6 are provided on both sides of the protrusion 5, and an extrusion channel 10 running through the extrusion section 4 along the axis direction of the extrusion section 4 is provided inside the extrusion section 4.

[0031] An extrusion mandrel for producing an easily tearable pipe according to the present utility model is provided with two groove-protrusion structures symmetrical about the axis of the mandrel on the outer surface of the mandrel extrusion section 4. A forming gap for forming a plastic pipe is formed here between the inner hole of the extrusion die. When the polymer melt flows through here for forming, it will present a tubular structure with two symmetrical groove defects.

[0032] In the process of catheter extrusion of the present utility model, due to its special groove-protrusion structure, two symmetrical defect structures are presented on the catheter. After the catheter is used, it can be easily torn along the two symmetrical defects, and it has a good application prospect in the mass production of tearable catheters.

[0033] The utility model can be used for mass-producing easily tearable pipes. Using it to prepare easily tearable pipes has high efficiency and the products are easy to tear, which is convenient for use.

[0034] Further, both the connecting section 1 and the cylindrical section 2 are cylindrical, and the conical section 3 is conical.

[0035] Further, a connecting channel 7, a cylindrical channel 8 and a conical channel 9 are provided inside the mandrel. One end of the connecting channel 7 is connected to one end of the cylindrical channel 8, the other end of the cylindrical channel 8 is connected to one end of the conical channel 9, and the other end of the conical channel 9 is connected to one end of the extrusion channel 10.

[0036] It can be understood that the connecting section 1 of the extrusion mandrel of the utility model is used to connect with the injection system and the extrusion / hydraulic system of the injection molding machine. The injection system of the injection molding machine injects the molten polymer into the extrusion mandrel, and the extrusion / hydraulic system controls the injection speed and pressure of the molten polymer. The molten polymer sequentially passes through the connecting channel 7, the cylindrical channel 8, the conical channel 9 and the extrusion channel 10 and enters the inner hole of the extrusion die. A forming gap for forming a plastic pipe is formed between the extrusion section 4 and the inner hole of the extrusion die. After the molten polymer fills the forming gap, it is cooled and formed. The formed easily tearable pipe presents a tubular structure with two symmetric groove defects on the inner surface, as Figure 6 and Figure 7 shown.

[0037] As an implementation manner, as Figure 3 shown, the inner diameter of the connecting channel 7 is larger than the inner diameter of the cylindrical channel 8. The inner diameter of the conical channel 9 gradually decreases in the direction away from the cylindrical channel 8. At the connection between the cylindrical channel 8 and the conical channel 9, the inner diameter of the conical channel 9 is equal to the inner diameter of the cylindrical channel 8. At the connection between the conical channel 9 and the extrusion channel 10, the inner diameter of the conical channel 9 is equal to the inner diameter of the extrusion channel 10.

[0038] Further, one end of the extrusion channel 10 extends into the conical section 3, one end of the conical channel 9 extends into the cylindrical section 2, and one end of the connecting channel 7 extends into the cylindrical section 2.

[0039] As an implementation manner, as Figure 3 shown, the extrusion channel 10 axially penetrates the extrusion section 4, and a part of the extrusion channel 10 extends into the conical section 3 and is connected to the conical channel 9 in the conical section 3. The conical channel 9 in the conical section 3 extends in the direction away from the base channel to the cylindrical section 2 and is connected to the cylindrical channel 8 in the cylindrical section 2. The connecting channel 7 in the connecting section 1 axially penetrates the connecting section 1, and a part of the connecting channel 7 extends into the cylindrical section 2 and is connected to the cylindrical channel 8 in the cylindrical section 2.

[0040] Further, as Figure 4 andFigure 5 As shown, the height of the protrusion 5 is greater than the depth of the U-shaped groove 6.

[0041] Furthermore, the connecting section 1, the cylindrical section 2, the conical section 3, and the extrusion section 4 are integral.

[0042] It can be understood that although the extrusion mandrel of the present utility model is divided into various parts such as the connecting section 1, the cylindrical section 2, the conical section 3, and the extrusion section 4, it does not mean that the extrusion mandrel of the present utility model is a split structure or detachable. The extrusion mandrel of the present utility model is integral or integrally formed.

[0043] Furthermore, the connecting section 1, the cylindrical section 2, the conical section 3, and the extrusion section 4 are coaxially arranged.

[0044] Furthermore, the connecting channel 7, the cylindrical channel 8, the conical channel 9, and the extrusion channel 10 are coaxially arranged.

[0045] It can be understood that the connecting section 1, the cylindrical section 2, the conical section 3, the extrusion section 4, the connecting channel 7, the cylindrical channel 8, the conical channel 9, and the extrusion channel 10 of the present utility model are coaxially arranged, which can enable the smooth flow of the molten polymer during the forming process of the easily tearable pipe through the extrusion mandrel.

[0046] The present utility model also provides an easily tearable pipe, as Figure 6 and Figure 7 shown, including a catheter tube body 12. Two slits 11 are provided on the inner surface of the catheter tube body 12 along the axial direction of the catheter tube body 12. There are two slits 11, and the two slits 11 are oppositely arranged on the inner surface of the catheter tube body 12.

[0047] The existing tearable pipe / catheter in the tearable vascular sheath assembly is usually a simple slender pipe. On the one hand, due to its tubular structure and the action of stress, a relatively large force is required for tearing. On the other hand, most of the existing tube bodies are uniform tubes, and the cracks generated during tearing are uneven and uneven.

[0048] Based on this, the present utility model provides an extrusion mandrel for producing an easily tearable pipe and an easily tearable pipe. An extrusion mandrel for producing an easily tearable pipe according to the present utility model is provided with two groove protrusion structures symmetrically arranged along the axis of the mandrel on the outer surface of the mandrel extrusion section 4. A forming gap for forming a plastic pipe is formed here between the inner hole of the extrusion die. When the polymer melt flows through here for forming, the catheter will present a tubular structure with two symmetric grooves / slits 11 defects.

[0049] During the extrusion process of the catheter of the present utility model, due to its special groove and protrusion structure, two symmetrical defects / gaps 11 are presented on the catheter. After the catheter is used, it can be easily torn along the two symmetrical defects / gaps 11, showing good application prospects in the mass production of tearable catheters.

[0050] The present utility model can be used for the mass production of easily tearable pipes. Using it to prepare easily tearable pipes has high efficiency and the products are easy to tear and convenient to use.

[0051] The easily tearable pipe / catheter mass-produced by the present utility model is labor-saving when torn, and the cracks generated during tearing are uniform and flat.

[0052] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0053] It is not difficult for those skilled in the art to understand that the present utility model includes any combination of the utility model content and the specific implementation part of the above specification and each part shown in the drawings. Due to space limitations and to make the specification concise, the various solutions formed by these combinations are not described one by one. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

[0054] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, replacements, and variations to the above embodiments within the scope of the present utility model without departing from the principles and purposes of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. An extrusion mandrel for producing easy-tear pipes, characterized in that: The invention comprises a connecting section, a column section, a conical section and an extrusion section which are connected in sequence. The extrusion section is cylindrical as a whole. Both sides of the outer surface of the extrusion section are provided with protrusions which are symmetrical along the central axis of the extrusion section. Both sides of the protrusions are provided with U-shaped grooves. The extrusion section is provided with an extrusion channel which runs through the extrusion section along the central axis of the extrusion section.

2. The extrusion mandrel for producing an easy-tear pipe according to claim 1, characterized in that: The connecting section and the cylindrical section are both cylindrical, and the tapered section is conical.

3. The extrusion mandrel for producing an easy-tear pipe according to claim 2, characterized in that: A connecting channel, a columnar channel and a tapered channel are provided in the core rod, one end of the connecting channel is connected to one end of the columnar channel, the other end of the columnar channel is connected to one end of the tapered channel, and the other end of the tapered channel is connected to one end of the extrusion channel.

4. The extrusion mandrel for producing an easy-tear pipe according to claim 3, characterized in that: One end of the extrusion channel extends into the conical section, one end of the conical channel extends into the cylindrical section, and one end of the connecting channel extends into the cylindrical section.

5. The extrusion mandrel for producing an easy-tear pipe according to claim 1, characterized in that: The height of the protrusion is greater than the depth of the U-shaped groove.

6. The extrusion mandrel for producing an easy-tear pipe according to claim 1, characterized in that: The connecting section, the cylindrical section, the tapered section and the extrusion section are integrated.

7. The extrusion mandrel for producing an easy-tear pipe according to claim 1, characterized in that: The connecting section, the cylindrical section, the conical section and the extrusion section are coaxially arranged.

8. The extrusion mandrel for producing an easy-tear pipe according to claim 3, characterized in that: The connecting channel, the cylindrical channel, the tapered channel and the extrusion channel are coaxially arranged.

9. An easy-to-tear tube, characterized in that: The invention comprises a catheter body, wherein the inner surface of the catheter body is provided with a notch arranged along the axial direction of the catheter body, and there are two notches, which are arranged opposite to each other on the inner surface of the catheter body.