Welded catheter seat assembly

Abstract

The utility model provides a welding type catheter and tube seat assembly, which comprises a catheter and a tube seat, the tube seat comprises a front tube and a rear seat, the front tube is connected with the rear seat, a first cavity and a second cavity are arranged in the tube seat, a step is arranged at the joint of the first cavity and the second cavity, and the first cavity is connected with the second cavity. One end of the guide pipe extends into the first cavity and makes contact with the step, and the guide pipe is fixedly connected with the pipe base in a welded mode. According to the welding type guide pipe and pipe seat assembly, the step is arranged in the pipe seat, the guide pipe and the pipe seat are connected in a welding mode, combination is tighter than adhesion, adhesive is avoided, verification cost and material cost are reduced, the sealing effect is better than that of embedded part injection molding and adhesion, and the performance requirement for high pressure resistance can be met; the welding type guide pipe seat assembly is easy to produce, high in production efficiency and low in production cost. The use of an adhesive is avoided, and the verification cost and the material cost are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and particularly relates to a welded 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 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 coupled with the high prices of the injection molding machine and the mold, the production efficiency of the product is low and the production cost is high; 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, making the injection molding raw material not fully filled, resulting in phenomena such as cavities, etc., leading to the risk that the connection between the hub and the pipeline cannot withstand high pressure (above 1000 psi).

[0004] The disadvantage of bonding is 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, and there is also the problem that air is not easily discharged at the joint between the hub and the pipeline. Both the incomplete filling of the bonding area and the non-discharge of 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, and the verification cost is relatively high. Content of the Utility Model

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

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

[0007] A welded catheter hub assembly includes a catheter and a hub. The hub includes a front tube and a rear seat. The front tube and the rear seat are connected. A first cavity and a second cavity are provided in the hub. A step is provided at the connection of the first cavity and the second cavity. One end of the catheter extends into the first cavity and contacts the step. The catheter and the hub are fixedly connected by welding.

[0008] Further, the length of the catheter extending into the first cavity of the socket is greater than or equal to the length of the catheter exposed outside the socket.

[0009] Further, both the front tube and the rear seat are in the shape of a circular tube, and the wall thickness of the front tube is less than the wall thickness of the rear seat.

[0010] Further, at the connection between the first cavity and the second cavity, the cross-sectional diameter of the first cavity is greater than the cross-sectional diameter of the second cavity.

[0011] Further, the outer surface of the part of the catheter extending into the first cavity fits with the inner surface of the first cavity.

[0012] Further, the first cavity penetrates through the front tube and extends into the rear seat, and the second cavity is completely located within the rear seat.

[0013] Further, the front tube and the rear seat are integral.

[0014] Further, the material of the socket is a polymer material.

[0015] Further, an external thread is provided at one end of the socket away from the catheter.

[0016] Further, the cross-sectional diameter of the rear seat gradually increases in the direction away from the catheter.

[0017] Therefore, the present utility model has the following beneficial effects:

[0018] In the welded catheter socket assembly of the present utility model, a step is provided in the socket, and the catheter and the socket are connected by welding. Their combination is tighter than bonding, avoiding the use of adhesives, reducing the verification cost and material cost, and the sealing effect is better than that of embedded injection molding and bonding, and can meet the performance requirements of high pressure resistance; moreover, the welded 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; and the length of the combination of the socket and the catheter pipeline is relatively long, and the two are combined together by welding. The wall thickness of the part where the socket and the catheter pipeline are combined is relatively thin and soft, playing the role of a reinforcing tube, thus removing the reinforcing tube and reducing the material cost.

[0019] Additional aspects and advantages of the present utility model will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present utility model. Description of the Drawings

[0020] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, where:

[0021] Figure 1 is a cross-sectional view of the welded conduit socket assembly of the present utility model;

[0022] Figure 2 is a schematic structural diagram of the conduit of the present utility model;

[0023] Figure 3 is an axonometric view of the socket of the present utility model;

[0024] Figure 4 is a front view of the socket of the present utility model;

[0025] Figure 5 is Figure 4 the A-A cross-sectional view shown.

[0026] In the figure: 1, conduit; 2, socket; 3, front tube; 4, rear seat; 5, first cavity; 6, second cavity; 7, step; 8, external thread. Detailed Description of the Specific Embodiment

[0027] 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 denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring 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.

[0028] In the present utility model, unless otherwise clearly specified and defined, terms such as "installed", "connected", "connected to", "fixed" and the like shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may 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.

[0029] As Figures 1-5 shown, a welded conduit socket assembly includes a conduit 1 and a socket 2. The socket 2 includes a front tube 3 and a rear seat 4. The front tube 3 and the rear seat 4 are connected. A first cavity 5 and a second cavity 6 are provided inside the socket 2. A step 7 is provided at the connection of the first cavity 5 and the second cavity 6. One end of the conduit 1 extends into the first cavity 5 and contacts the step 7. The conduit 1 and the socket 2 are fixedly connected by welding.

[0030] In a welded conduit socket assembly of the present utility model, a step 7 is provided in the socket 2. The conduit 1 and the socket 2 are connected by welding, and their combination is tighter than bonding, not easily falling off, avoiding the use of adhesives, reducing the verification cost and material cost, and the sealing effect is better than that of embedded injection molding and bonding, and can meet the performance requirements of high pressure resistance.

[0031] A welded conduit 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 and reduces the verification cost and material cost.

[0032] Further, as Figure 1 shown, the length of the conduit 1 extending into the first cavity 5 of the socket 2 is greater than or equal to the length of the conduit 1 exposed outside the socket 2.

[0033] As Figure 2 shown, it is a schematic structural diagram of the conduit 1. The conduit 1 is a slender hollow circular tube.

[0034] Further, as Figure 3 、 Figure 4 and Figure 5 shown, the front tube 3 and the rear seat 4 are both in the shape of a circular tube, and the wall thickness of the front tube 3 is less than the wall thickness of the rear seat 4.

[0035] At present, a reinforcing tube / stress buffer sheath needs to be additionally installed at the connection between the socket 2 and the conduit 1 pipeline in the market to protect the conduit 1 pipeline and prevent the conduit 1 pipeline from being bent at the connection with the socket 2, which requires additional production costs. The combination length of the socket 2 and the pipeline of the present utility model is relatively long, and the two are combined together by welding. The wall thickness of the part where the socket 2 and the pipeline are combined is relatively thin and relatively soft, playing the role of a reinforcing tube, thus removing the reinforcing tube structure and reducing the material cost.

[0036] Further, as Figure 5 shown, at the connection between the first cavity 5 and the second cavity 6, the cross-sectional diameter of the first cavity 5 is greater than the cross-sectional diameter of the second cavity 6.

[0037] Since the cross-sectional diameter of the first cavity 5 is greater than the cross-sectional diameter of the second cavity 6 at the connection, a step 7 structure is formed at the connection between the first cavity 5 and the second cavity 6. The step 7 plays a role in positioning and limiting the end of the conduit 1, and is also a welding point between the conduit 1 and the socket 2.

[0038] Further, the outer surface of the part of the conduit 1 extending into the first cavity 5 fits with the inner surface of the first cavity 5. That is, there is a clearance fit between the conduit 1 and the front tube 3, and the minimum clearance is 0. The places where the conduit 1 and the front tube 3 are in contact can all be welding points, realizing the fixed connection between the conduit 1 and the socket 2 by welding.

[0039] As another implementation, the place where the catheter 1 fits against the inner surface of the front tube 3 can also be connected by bonding.

[0040] Furthermore, as Figure 5 shown, the first cavity 5 extends through the front tube 3 into the rear seat 4, and the second cavity 6 is completely located within the rear seat 4.

[0041] Furthermore, the front tube 3 and the rear seat 4 are integral.

[0042] As one implementation, the front tube 3 and the rear seat 4 are integrally formed by injection molding.

[0043] As another implementation, the front tube 3 and the rear seat 4 can also be injection molded separately and then connected together by welding or bonding.

[0044] Furthermore, the material of the tube seat 2 is a polymer material.

[0045] Furthermore, an external thread 8 is provided at one end of the tube seat 2 away from the catheter 1.

[0046] The external thread 8 is used to cooperate with a Luer connector to connect to other devices or instruments.

[0047] Furthermore, the cross-sectional diameter of the rear seat 4 gradually increases in the direction away from the catheter 1. The cross-sectional diameter of the first half of the second cavity 6 within the rear seat 4 also gradually increases in the direction away from the catheter 1, facilitating the smooth passage of the liquid within the catheter 1 through the second cavity 6 during application.

[0048] In a welded catheter tube seat assembly of the present utility model, a step is provided within the tube seat. The catheter and the tube seat are connected by welding, and their combination is tighter than bonding, avoiding the use of adhesives, reducing the verification cost and material cost. Moreover, the sealing effect is better than that of embedded injection molding and bonding, capable of meeting the performance requirements of high pressure resistance (1000 psi). Also, the length of the combination of the tube seat and the catheter pipeline is relatively long, and the two are combined together by welding. The wall thickness of the part where the tube seat and the catheter pipeline are combined is relatively thin and soft, playing the role of a reinforcing tube, thus removing the reinforcing tube and reducing the material cost.

[0049] 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.

[0050] 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.

[0051] 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. Without departing from the principle and purpose of 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. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A welded catheter socket assembly, characterized in that: The invention comprises a conduit and a tube seat, wherein the tube seat comprises a front tube and a rear seat, wherein the front tube and the rear seat are connected, wherein a first cavity and a second cavity are arranged in the tube seat, wherein a step is arranged at the connection between the first cavity and the second cavity, wherein one end of the conduit extends into the first cavity and contacts the step, and wherein the conduit is fixedly connected to the tube seat by welding.

2. A welded catheter socket assembly according to claim 1, characterized in that: The length of the conduit extending into the first cavity of the tube seat is greater than or equal to the length of the conduit exposed outside the tube seat.

3. A welded catheter socket assembly according to claim 1, characterized in that: The front tube and the rear seat are both in a circular tube shape, and the tube wall thickness of the front tube is smaller than the tube wall thickness of the rear seat.

4. A welded catheter socket assembly according to claim 2, characterized in that: At the connection between the first cavity and the second cavity, the cross-sectional diameter of the first cavity is greater than the cross-sectional diameter of the second cavity.

5. The welded catheter socket assembly according to claim 3, characterized in that: The outer surface of the portion of the catheter extending into the first cavity is in contact with the inner surface of the first cavity.

6. The welded catheter socket assembly according to claim 1, characterized in that: The first cavity extends through the front tube to the rear seat, and the second cavity is completely located in the rear seat.

7. A welded catheter socket assembly according to claim 6, characterized in that: The front tube and the rear seat are integral.

8. The welded catheter socket assembly according to claim 1, characterized in that: The tube seat is made of polymer material.

9. The welded catheter socket assembly according to claim 1, characterized in that: An end of the tube seat away from the guide tube is provided with an external thread.

10. A welded catheter socket assembly according to any one of claims 1 to 9, characterized in that: The cross-sectional diameter of the rear seat gradually increases in a direction away from the guide tube.

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