Press-fit type catheter base assembly

Abstract

The utility model discloses a press fit type conduit pipe seat assembly, including conduit, reinforcing pipe, insert and pipe seat, said conduit extends into the reinforcing pipe and with said reinforcing pipe fixed connection, said reinforcing pipe one end is the flaring end, said reinforcing pipe flaring end extends into said pipe seat, said insert is provided in said pipe seat, said insert is provided in said pipe seat, said insert is provided in said pipe seat. And the flaring end of the reinforcing tube is fixedly connected with the inner wall of the tube seat through the insert. According to the press-fit type guide pipe base assembly, the reinforcing pipe and the pipe base are combined together in an insert press-fit mode, and the press-fit type guide pipe base assembly is firmer than embedded part injection molding and bonding; the reinforcing pipe is in interference fit with the pipe seat, the pipe seat is in interference fit with the insert, and the insert is in interference fit with the reinforcing pipe, so that the sealing effect is better than that of embedded part injection molding and bonding, the performance requirement for high pressure resistance can be met, and the press-fit type guide pipe seat assembly is easy to produce, high in production efficiency and low in production cost.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a press - fit type catheter hub assembly. Background Art

[0002] At present, the connection methods between the hub and the catheter pipeline on the market are generally two forms: insert - molding (after the pipeline is flared and inserted into the mold core pin, it is placed in the mold for injection molding, and then the core pin is taken out after injection molding) or bonding (the hub is injection - molded separately and connected to the catheter pipeline by bonding). However, both have defects.

[0003] The disadvantage of insert - molding is that manual feeding is required during injection molding, the number of mold cavities is relatively small (generally 1 - 4 cavities), and the high prices of the injection molding machine and the mold lead to low production efficiency and high production cost of the product. Moreover, since the injection molding raw material is a mixture rather than a pure substance, there is an unstable flow phenomenon. The pre - flared catheter pipeline will also interfere with the flow of the material, resulting in insufficient filling of the injection molding raw material and the existence of cavities and other phenomena, leading to the risk that the connection between the hub and the pipeline cannot withstand high pressure (above 1000 psi).

[0004] The disadvantages of bonding are that different adhesives are suitable for bonding different materials. Using inappropriate adhesives or bonding processes will lead to the risk that the connection between the hub and the pipeline cannot withstand high pressure (above 1000 psi), and there is also a risk of easy detachment / separation. When bonding, the adhesive easily flows into the middle of the pipeline, blocking the pipeline and resulting in defective products. When bonding, the adhesive is relatively viscous and not easy to flow, making it difficult to fill the bonding area. There is also the problem that air is not easily discharged at the joint between the hub and the pipeline. Both the unfilled bonding area and the un - discharged air are likely to lead to the risk that the connection between the hub and the pipeline cannot withstand high pressure (above 1000 psi), and there is also a risk of easy detachment / separation. The verification period of the adhesive is relatively long, and selecting an adhesive requires rich experience and a relatively large sample size for actual verification, resulting in a high verification cost. Summary of the Utility Model

[0005] Therefore, an object of the present utility model is to provide a press - fit type catheter hub assembly to solve the problems mentioned in the background art and overcome the deficiencies in the prior art.

[0006] To achieve the above object, the present utility model adopts the following technical solutions:

[0007] A press - fit type catheter hub assembly includes a catheter, a reinforcing tube, an insert and a hub. The catheter extends into the reinforcing tube and is fixedly connected to the reinforcing tube. One end of the reinforcing tube is a flared end, and the flared end of the reinforcing tube extends into the hub. The insert is arranged in the hub, and the flared end of the reinforcing tube is fixedly connected to the inner wall of the hub through the insert.

[0008] Further, the insert includes an adaptation section, a first interference section, a first transition section, a second interference section, and a limiting section that are connected in sequence. The adaptation section, the first interference section, the first transition section, the second interference section, and the limiting section are integral. The adaptation section and the limiting section are frustum-shaped, and the first interference section and the second interference section are cylindrical.

[0009] Further, the reinforcing pipe includes a connection section and a second transition section. The connection section is connected to the flared end of the reinforcing pipe through the second transition section. The connection section, the second transition section, and the flared end are integral. The cross-sectional diameter of the flared end is larger than that of the connection section.

[0010] Further, the main body of the pipe seat is cylindrical. A first cavity, a receiving cavity, a transition cavity, and a second cavity that are connected in communication are sequentially provided in the pipe seat. The receiving cavity is used to place and accommodate the insert, and the length of the receiving cavity is equal to the length of the insert.

[0011] Further, when the reinforcing pipe, the insert, and the pipe seat are fitted together, the insert is located in the receiving cavity of the pipe seat. The reinforcing pipe extends into the receiving cavity through the first cavity, and the flared end of the reinforcing pipe is located in the receiving cavity. The outer wall of the adaptation section of the insert is in contact with the inner wall of the second transition section of the reinforcing pipe. The first interference section of the insert is in contact with and interference-fitted with the inner wall of the flared end of the reinforcing pipe. The outer wall of the flared end of the reinforcing pipe is in contact with and interference-fitted with the inner wall of the receiving cavity of the pipe seat. The second transition section of the insert is in contact with and interference-fitted with the inner wall of the receiving cavity of the pipe seat.

[0012] Further, the catheter and the reinforcing pipe are fixedly connected by bonding or welding.

[0013] Further, the materials of the reinforcing pipe, the insert, and the pipe seat are all polymer materials.

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

[0015] In the press-fit catheter pipe seat assembly of the present utility model, the reinforcing pipe and the pipe seat are combined together by means of insert press-fitting, which is more firm than in-mold insert molding and bonding; the reinforcing pipe and the pipe seat, the pipe seat and the insert, and the insert and the reinforcing pipe are all interference-fitted, making its sealing effect better than in-mold insert molding and bonding, and can meet the performance requirements of high pressure resistance. Moreover, the press-fit catheter pipe seat assembly of the present utility model is easy to produce, has high production efficiency, and low production cost.

[0016] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present utility model. Brief Description of the Drawings

[0017] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0018] Figure 1 is an overall cross-sectional view of the press-fit catheter socket assembly of the present utility model;

[0019] Figure 2 is a schematic structural view of the catheter of the present utility model;

[0020] Figure 3 is a schematic structural view of a common reinforcing tube;

[0021] Figure 4 is a schematic structural view of the reinforcing tube with a flared section of the present utility model;

[0022] Figure 5 is a cross-sectional view of the reinforcing tube of the present utility model;

[0023] Figure 6 is an axonometric view of the insert of the present utility model;

[0024] Figure 7 is a front view of the insert of the present utility model;

[0025] Figure 8 is a cross-sectional view of the insert of the present utility model;

[0026] Figure 9 is an axonometric view of the socket of the present utility model;

[0027] Figure 10 is a cross-sectional view of the socket of the present utility model.

[0028] In the figures: 1. Catheter; 2. Reinforcing tube; 3. Insert; 4. Socket; 5. Flared end; 6. Adaptation section; 7. First interference section; 8. First transition section; 9. Second interference section; 10. Limiting section; 11. Connection section; 12. Second transition section; 13. First cavity; 14. Accommodation cavity; 15. Transition cavity; 16. Second cavity; 17. Butterfly wing. Detailed Description of the Embodiments

[0029] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present utility model and should not be construed as limiting the present utility model.

[0030] In the present utility model, unless otherwise clearly stipulated and defined, terms such as "installation", "connection", "linkage", "fixation", etc. shall 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 a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. 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.

[0031] As Figure 1 shown, a press-fit catheter socket assembly includes a catheter 1, a reinforcing tube 2, an insert 3, and a socket 4. The catheter 1 extends into the reinforcing tube 2 and is fixedly connected to the reinforcing tube 2. One end of the reinforcing tube 2 is a flared end 5, and the flared end 5 of the reinforcing tube 2 extends into the socket 4. The insert 3 is disposed in the socket 4, and the flared end 5 of the reinforcing tube 2 is fixedly connected to the inner wall of the socket 4 through the insert 3.

[0032] In the press-fit catheter socket assembly of the present utility model, the reinforcing tube 2 and the socket 4 are combined together by means of press-fitting with the insert 3, which is more firm than in-mold embedding injection molding and bonding; the reinforcing tube 2 and the socket 4, the socket 4 and the insert 3, and the insert 3 and the reinforcing tube 2 are all in interference fit, making its sealing effect better than in-mold embedding injection molding and bonding, and capable of meeting the performance requirements of high pressure resistance (1000 psi). Moreover, the press-fit catheter socket assembly of the present utility model is easy to produce, has high production efficiency, and low production cost; it avoids the use of adhesives, reducing the verification cost and material cost.

[0033] As Figure 1 shown, the length of the catheter 1 is greater than the length of the reinforcing tube 2. The reinforcing tube 2 is sleeved outside the catheter 1, and one end of the catheter 1 is inserted into the reinforcing tube 2 until the junction of the connection section 11 and the second transition section 12 of the reinforcing tube 2.

[0034] As Figure 2 shown, it is a structural schematic diagram of the catheter 1. The catheter 1 is a slender hollow circular tube.

[0035] As Figure 3 shown, it is a structural schematic diagram of a common reinforcing tube 2, which is also a slender hollow circular tube. The structure of the reinforcing tube 2 of the present utility model is as Figure 4 and Figure 5 shown. An open end is provided at one end of the reinforcing tube 2, and the cross-sectional diameter of the open end of the reinforcing tube 2 is greater than the cross-sectional diameter of other parts of the reinforcing tube 2.

[0036] As Figure 6 、 Figure 7 and Figure 8As shown, further, the insert 3 includes an adaptation section 6, a first interference section 7, a first transition section 8, a second interference section 9, and a limiting section 10 that are connected in sequence. The adaptation section 6, the first interference section 7, the first transition section 8, the second interference section 9, and the limiting section 10 are integral. The adaptation section 6 and the limiting section 10 are frustum-shaped, and the first interference section 7 and the second interference section 9 are cylindrical.

[0037] As Figure 7 shown, the front view of the adaptation section 6 is an inverted trapezoid, and its three-dimensional structure is a hollow frustum. One end of the adaptation section 6 is connected to one end of the first interference section 7. The front view of the first interference section 7 is a rectangle, and its three-dimensional structure is a hollow cylinder. The other end of the first interference section 7 is connected to one end of the first transition section 8. The first transition section 8 is integrally cylindrical, and its front view is irregular. The other end of the first transition section 8 is connected to one end of the second interference section 9. The front view of the second interference section 9 is a rectangle, and its three-dimensional structure is a hollow cylinder with a length less than that of the first interference section 7. The cross-sectional diameter of the second interference section 9 is greater than that of the first interference section 7. The other end of the second interference section 9 is connected to one end of the limiting section 10. The front view of the limiting section 10 is an inverted trapezoid, and its three-dimensional structure is a hollow frustum.

[0038] As Figure 5 shown, further, the reinforcing pipe 2 includes a connecting section 11 and a second transition section 12. The connecting section 11 is connected to the flared end 5 of the reinforcing pipe 2 through the second transition section 12. The connecting section 11, the second transition section 12, and the flared end 5 are integral. The cross-sectional diameter of the flared end 5 is greater than that of the connecting section 11.

[0039] As Figure 9 and Figure 10 shown, further, the main body of the pipe socket 4 is cylindrical. The pipe socket 4 is successively provided with a first cavity 13, a receiving cavity 14, a transition cavity 15, and a second cavity 16 that are connected and communicate with each other. The receiving cavity 14 is used to place and accommodate the insert 3, and the length of the receiving cavity 14 is equal to the length of the insert 3.

[0040] As an implementation manner, the cross-sectional diameter of the receiving cavity 14 is greater than that of the first cavity 13. The cross-sectional diameter of the transition cavity 15 is less than that of the receiving cavity 14. The cross-sectional diameter of the second cavity 16 is greater than that of the transition cavity 15.

[0041] The first cavity 13 is used to accommodate the passage of the reinforcing pipe 2. The receiving cavity 14 is used to accommodate the insert 3 and the flared end 5 of the reinforcing pipe 2. The cross-sectional diameter of the transition cavity 15 is less than that of the receiving cavity 14 and is used to limit the insert 3 in the receiving cavity 14 to prevent the insert 3 from moving. The second cavity 16, the transition cavity 15, the receiving cavity 14, and the first cavity 13 communicate and penetrate through the pipe socket 4.

[0042] Further, when the reinforcing tube 2, the insert 3 and the tube socket 4 are fitted together, the insert 3 is located within the receiving cavity 14 of the tube socket 4. The reinforcing tube 2 extends into the receiving cavity 14 through the first cavity 13. The flared end 5 of the reinforcing tube 2 is located within the receiving cavity 14. The outer wall of the mating section 6 of the insert 3 is in contact with the inner wall of the second transition section 12 of the reinforcing tube 2. The first interference section 7 of the insert 3 is in contact with and interference-fitted with the inner wall of the flared end 5 of the reinforcing tube 2. The outer wall of the flared end 5 of the reinforcing tube 2 is in contact with and interference-fitted with the inner wall of the receiving cavity 14 of the tube socket 4. The second transition section 12 of the insert 3 is in contact with and interference-fitted with the inner wall of the receiving cavity 14 of the tube socket 4.

[0043] As an implementation manner, the catheter 1 and the reinforcing tube 2 are fixedly connected by bonding.

[0044] As an implementation manner, the catheter 1 and the reinforcing tube 2 are also fixedly connected by welding. The welding joint is tighter than the bonding, and it also avoids the use of adhesives, reducing the verification cost and material cost. Moreover, the sealing effect is better than that of the embedded injection molding and bonding, and it can meet the performance requirements of high pressure resistance (1000 psi).

[0045] Further, the materials of the reinforcing tube 2, the tube socket 4 and the insert 3 are all polymer materials.

[0046] As Figure 9 shown, butterfly wings 17 are provided on both sides of the tube socket 4. The design of the butterfly wings 17 provides a gripping point for the hands of medical staff during the implantation operation, making it more convenient for medical staff to grip and operate, and having better practicability.

[0047] The utility model assembles the reinforcing tube 2 and the pipeline together by welding / bonding, then flares the other end of the reinforcing tube 2, and then installs the reinforcing tube 2 and the pipeline into the tube socket 4 together, and uses the insert 3 for pressing to assemble the reinforcing tube 2 and the tube socket 4 together. It is more firm than the embedded injection molding and bonding. Moreover, the reinforcing tube 2 and the tube socket 4, the tube socket 4 and the insert 3, and the insert 3 and the reinforcing tube 2 are all interference-fitted. The materials of the tube socket 4, the reinforcing tube 2 and the insert 3 are all polymer materials. The interference fit makes its sealing effect better than that of the embedded injection molding and bonding, and it can meet the performance requirements of high pressure resistance (1000 psi). Moreover, the production efficiency is high and the production cost is low.

[0048] 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.

[0049] Those skilled in the art can easily understand that the present utility model includes any combination of the utility model content and the specific implementation part in the above description and each part shown in the drawings. Due to space limitations and to make the description 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.

[0050] 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 principle and purpose of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A press-fit catheter socket assembly, characterized in that: The invention comprises a conduit, a reinforcing tube, an insert and a tube seat, wherein the conduit extends into the reinforcing tube and is fixedly connected to the reinforcing tube, one end of the reinforcing tube is a flared end, the flared end of the reinforcing tube extends into the tube seat, the insert is arranged in the tube seat, and the flared end of the reinforcing tube is fixedly connected to the inner wall of the tube seat via the insert.

2. A press-fit catheter socket assembly according to claim 1, characterized in that: The insert includes an adapting section, a first interference section, a first transition section, a second interference section and a limiting section which are connected in sequence; the adapting section, the first interference section, the first transition section, the second interference section and the limiting section are integrated; the adapting section and the limiting section are truncated cone-shaped; the first interference section and the second interference section are cylindrical.

3. A press-fit catheter hub assembly according to claim 2, characterized in that: The reinforcement tube includes a connecting section and a second transition section, wherein the connecting section is connected to the flared end of the reinforcement tube via the second transition section, the connecting section, the second transition section and the flared end are integrated, and the cross-sectional diameter of the flared end is greater than the cross-sectional diameter of the connecting section.

4. A press-fit catheter hub assembly according to claim 3, characterized in that: The main body of the tube seat is cylindrical, and a first cavity, a receiving cavity, a transition cavity and a second cavity which are connected to each other are sequentially arranged in the tube seat. The receiving cavity is used to place and receive the insert, and the length of the receiving cavity is equal to the length of the insert.

5. A press-fit catheter hub assembly according to claim 4, characterized in that: When the reinforcing tube, the insert and the tube seat are matched, the insert is located in the accommodating cavity of the tube seat, the reinforcing tube extends into the accommodating cavity through the first cavity, the flared end of the reinforcing tube is located in the accommodating cavity, the outer wall of the adapting section of the insert contacts the inner wall of the second transition section of the reinforcing tube, the first interference section of the insert contacts and interferes with the inner wall of the flared end of the reinforcing tube, the outer wall of the flared end of the reinforcing tube contacts and interferes with the inner wall of the tube seat accommodating cavity, and the second transition section of the insert contacts and interferes with the inner wall of the tube seat accommodating cavity.

6. The press-fit catheter hub assembly according to claim 1, characterized in that: The conduit and the reinforcement tube are fixedly connected by bonding or welding.

7. A press-fit catheter hub assembly according to any one of claims 1 to 6, characterized in that: The reinforcing tube, the tube seat and the insert are all made of polymer materials.

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