Bonding type catheter base assembly

Abstract

The utility model discloses a bonding type catheter tube seat component, which comprises a catheter, a reinforcing tube and a tube seat, the reinforcing tube is sleeved outside the catheter, an inlet cavity and an inner cavity are arranged in the tube seat, the section diameter of the inlet cavity is larger than that of the inner cavity, one end of the reinforcing tube extends into the inlet cavity, one end of the catheter extends into the inner cavity, and the other end of the catheter extends into the inner cavity. A first boss and a second boss are arranged in the inner cavity, the guide pipe and the inner wall of the inner cavity are bonded through an adhesive, and the reinforcing pipe and the inner wall of the inlet cavity are bonded through an adhesive. The inlet cavity and the inner cavity are arranged in the tube seat, the step is formed at the joint of the inlet cavity and the inner cavity, the first boss and the second boss are further arranged in the inner cavity, and the first boss enables a local narrow gap to be formed between the inner cavity of the tube seat and the outer wall of a conduit pipeline, so that the local narrow gap is more easily filled with an adhesive; the high-pressure-resistant adhesive has the advantages that the high-pressure-resistant adhesive is more easily sealed, the complete sealing effect is achieved, in the adhesive solidification process, the possibility that cavities are formed due to adhesive shrinkage is reduced, and the high-pressure-resistant performance requirement can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to an adhesive 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), but 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, resulting in 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, making the injection molding raw material not fully filled, resulting in phenomena such as cavities, etc., leading to a 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 a 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. The incomplete filling of the bonding area and the non-exhaustion of air are both likely to lead to a 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. Summary of the Utility Model

[0005] For this reason, an object of the present utility model is to provide an adhesive 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] An adhesive catheter hub assembly includes a catheter, a reinforcing tube, and a hub. The reinforcing tube is sleeved outside the catheter. The hub is provided with an inlet cavity and an inner cavity. The cross-sectional diameter of the inlet cavity is larger than that of the inner cavity. One end of the reinforcing tube extends into the inlet cavity, one end of the catheter extends into the inner cavity. The inner cavity is provided with a first boss and a second boss. The catheter and the inner wall of the inner cavity, and the reinforcing tube and the inner wall of the inlet cavity are both bonded by an adhesive.

[0008] Further, the first boss is located between the inlet cavity and the second boss. The axial cross-section of the inner cavity corresponding to the first boss is rectangular, and there is a clearance fit between the outer wall of the catheter and the inner wall of the inner cavity corresponding to the first boss.

[0009] Further, the second boss includes three annular protrusions. The axial cross-section of the inner cavity corresponding to the annular protrusion is quadrilateral. The upper and lower sides of the quadrilateral are concave smooth curves, and the two side edges of the quadrilateral are vertical straight lines. The three annular protrusions are arranged at equal intervals.

[0010] Further, there is an interference fit between the outer wall of the catheter and the inner wall of the inner cavity corresponding to the second boss.

[0011] Further, the catheter and the reinforcing tube are fixedly connected by bonding or welding.

[0012] Further, a communication cavity is also provided in the socket. One end of the communication cavity is in contact with one end of the inner cavity. At the connection of the communication cavity and the inner cavity, the cross-sectional diameter of the inner cavity is larger than the cross-sectional diameter of the communication cavity.

[0013] Further, the cross-sectional diameter of the communication cavity gradually increases in the direction away from the inner cavity.

[0014] Further, it further includes butterfly wings. There are two butterfly wings, and the two butterfly wings are symmetrically arranged on the socket. The butterfly wings and the socket are integrated. The socket and the reinforcing tube are made of polymer materials.

[0015] Further, grooves matching the annular protrusions are provided on the outer surface of the catheter.

[0016] Further, an external thread is provided at one end of the socket away from the catheter.

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

[0018] In a bonded catheter socket assembly of the present utility model, an inlet cavity and an inner cavity are provided in the socket. The cross-sectional diameter of the inlet cavity is larger than that of the inner cavity, and a step is formed at the connection of the inlet cavity and the inner cavity. A first boss and a second boss are also provided in the inner cavity. The first boss forms a locally narrow gap between the inner cavity of the socket and the outer wall of the catheter pipeline, making it easier for the adhesive to fill here and easier to achieve a complete sealing effect. Moreover, during the curing process of the adhesive, the possibility of cavities caused by the shrinkage of the adhesive is reduced, and the performance requirements for high pressure resistance can be met.

[0019] The three annular protrusions of the second boss are in a slightly interference fit with the catheter pipeline. Since the outer layer of the catheter pipeline is made of polymer material, even with a slight interference fit, the catheter pipeline can still be normally inserted into the pipeline limiting position in the inner cavity of the socket, that is, the connection between the inner cavity and the communication cavity. Due to the presence of grooves corresponding to the three annular protrusions on the surface of the catheter pipeline, the design of the three circles of interference protrusions can achieve a better sealing effect than the overall interference, meeting the performance requirements of high pressure resistance, and making it easier for production personnel to insert the catheter pipeline in place. The three circles of protrusions can also prevent the adhesive from flowing into the middle of the pipeline, thus avoiding the problem of the adhesive blocking the catheter pipeline and reducing the defect rate.

[0020] 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

[0021] 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, wherein:

[0022] Figure 1 is a cross-sectional view of the adhesive catheter socket assembly of the present utility model;

[0023] Figure 2 is a schematic structural view of the catheter of the present utility model;

[0024] Figure 3 is a schematic structural view of the reinforcing pipe of the present utility model;

[0025] Figure 4 is an axonometric view of the socket of the present utility model;

[0026] Figure 5 is a front view of the socket of the present utility model;

[0027] Figure 6 is Figure 5 the A-A cross-sectional view shown;

[0028] Figure 7 is Figure 6 the enlarged view at I in;

[0029] Figure 8 is Figure 6 the enlarged view at II in.

[0030] In the figure: 1. Catheter; 2. Reinforcing pipe; 3. Socket; 4. Inlet cavity; 5. Inner cavity; 6. First boss; 7. Second boss; 8. First protrusion; 9. Second protrusion; 10. Third protrusion; 11. Communication cavity; 12. Butterfly wing; 13. External thread. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] Embodiments of the present utility model will be described in detail below. 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 with 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, but should not be construed as limiting the present utility model.

[0032] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation", etc. 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.

[0033] As Figures 1-8 shown, an adhesive catheter 1 socket 3 assembly includes a catheter 1, a reinforcing tube 2, and a socket 3. The reinforcing tube 2 is sleeved outside the catheter 1. The socket 3 is provided with an inlet cavity 4 and an inner cavity 5. The cross-sectional diameter of the inlet cavity 4 is larger than that of the inner cavity 5. One end of the reinforcing tube 2 extends into the inlet cavity 4, and one end of the catheter 1 extends into the inner cavity 5. A first boss 6 and a second boss 7 are provided in the inner cavity 5. The catheter 1 and the inner wall of the inner cavity 5, and the reinforcing tube 2 and the inner wall of the inlet cavity 4 are adhesively bonded through an adhesive.

[0034] In the adhesive catheter 1 socket 3 assembly of the present utility model, the socket 3 is provided with an inlet cavity 4 and an inner cavity 5. The cross-sectional diameter of the inlet cavity 4 is larger than that of the inner cavity 5. A step is formed at the junction of the inlet cavity 4 and the inner cavity 5 for limiting the reinforcing tube 2. A first boss 6 and a second boss 7 are also provided in the inner cavity 5. The first boss 6 forms a local narrow gap between the inner cavity 5 of the socket 3 and the outer wall of the catheter 1 pipeline, making it easier for the adhesive to fill here and easier to achieve a complete sealing effect. Moreover, during the solidification process of the adhesive, the possibility of cavities caused by the shrinkage of the adhesive is reduced, and the performance requirements for high pressure resistance can be met.

[0035] As Figure 2 shown, it is a structural schematic diagram of the catheter 1. The catheter 1 is a slender hollow circular tube.

[0036] As Figure 3 shown, it is a structural schematic diagram of the reinforcing tube 2, which is also a slender hollow circular tube, but the length of the reinforcing tube 2 is less than that of the catheter 1, and the cross-sectional diameter of the lengthened tube is larger than that of the catheter 1. The catheter 1 can penetrate into the inside of the reinforcing tube 2, and the reinforcing tube 2 is sleeved on the catheter 1.

[0037] Furthermore, as Figure 6and Figure 7 as shown Figure 7 is an enlarged schematic view of the first boss 6. The first boss 6 is located between the inlet cavity 4 and the second boss 7. The axial section of the inner cavity 5 corresponding to the first boss 6 is rectangular, and there is a clearance fit between the outer wall of the catheter 1 and the inner wall of the inner cavity 5 corresponding to the first boss 6.

[0038] The first boss 6 is located in the inner cavity 5 and is a structure protruding towards the inside of the inner cavity 5. However Figure 6 and Figure 7 are cross-sectional views. Therefore, when viewed from Figure 6 and Figure 7 it looks like a concave structure. Actually, the first boss 6 is a protruding structure surrounding the inner surface of the inner cavity 5 for one week.

[0039] Furthermore, as shown in Figure 6 and Figure 8 the second boss 7 includes three annular protrusions, namely the first protrusion 8, the second protrusion 9 and the third protrusion 10. The axial section of the inner cavity 5 corresponding to the annular protrusion is quadrilateral. The upper and lower sides of the quadrilateral are concave smooth curves, and the two side edges of the quadrilateral are vertical straight lines. The three annular protrusions are arranged at equal intervals.

[0040] As an implementation manner, the second boss 7 may also include four annular protrusions.

[0041] As an implementation manner, the second boss 7 may also include two annular protrusions.

[0042] That is to say, the number of annular protrusions of the second boss 7 of the present utility model can be selectively set according to actual needs.

[0043] Furthermore, there is an interference fit between the outer wall of the catheter 1 and the inner wall of the inner cavity 5 corresponding to the second boss 7.

[0044] The three annular protrusions of the second boss 7 of the present utility model are slightly interference-fitted with the catheter 1 pipeline. Since the outer layer of the catheter 1 pipeline is made of a polymer material, with a slight interference fit, the catheter 1 pipeline can also be normally inserted into the pipeline limiting position of the inner cavity 5 of the socket 3, that is, the connection part between the inner cavity 5 and the communication cavity 11. Since there are grooves corresponding to the three annular protrusions on the surface of the catheter 1 pipeline, the design of the three circles of interference protrusions will play a better sealing role than the overall interference, and can meet the performance requirements of high pressure resistance, and it is easier for production personnel to insert the catheter 1 pipeline in place. The three circles of protrusions can also prevent the adhesive from flowing to the middle of the pipeline, thereby avoiding the problem of the adhesive blocking the catheter 1 pipeline and reducing the defective rate.

[0045] Furthermore, the catheter 1 and the reinforcing tube 2 are fixedly connected by bonding or welding.

[0046] Furthermore, as shown inFigure 6 As shown, a communication cavity 11 is further provided in the socket 3. One end of the communication cavity 11 is in contact with one end of the inner cavity 5. At the connection between the communication cavity 11 and the inner cavity 5, the cross-sectional diameter of the inner cavity 5 is larger than that of the communication cavity 11.

[0047] The cross-sectional diameter of the inner cavity 5 at the connection between the communication cavity 11 and the inner cavity 5 is larger than that of the communication cavity 11, forming a step at the connection between the communication cavity 11 and the inner cavity 5 for limiting the catheter 1.

[0048] Furthermore, as Figure 6 shown, the cross-sectional diameter of the communication cavity 11 gradually increases in the direction away from the inner cavity 5. The cross-sectional diameter of the rear half of the socket 3 also gradually increases in the direction away from the catheter 1, facilitating the smooth passage of the liquid in the catheter 1 through the communication cavity 11 during application.

[0049] Furthermore, it further includes two butterfly wings 12. The two butterfly wings 12 are symmetrically arranged on the socket 3. The butterfly wings 12 and the socket 3 are integrated. The socket 3 and the reinforcing tube 2 are made of polymer materials.

[0050] As an implementation manner, the outer layer of the catheter 1 is made of polymer material, the outer layer of the pipeline is an extruded plastic pipe, and the middle layer is woven / wound metal wire.

[0051] The design of the butterfly wings 12 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, with better practicality.

[0052] Furthermore, the outer surface of the catheter 1 is provided with a groove that fits with the annular protrusion, not visible in the figure.

[0053] Since the outer layer of the pipeline is made of polymer material, with a slight interference fit, the pipeline can also be normally inserted into the pipeline limiting position of the inner cavity 5 of the socket 3. Since the outer layer of the pipeline is an extruded plastic pipe and the middle layer is woven / wound metal wire, there are slight grooves on the pipeline surface that fit with the woven / wound metal wire. The design of the three-ring interference protrusions will have a better sealing effect than the overall interference, and it is easier for production personnel to insert the pipeline in place. The three-ring protrusions also prevent the adhesive from flowing to the middle of the pipeline, thus avoiding the problem of the adhesive blocking the pipeline and reducing the defect rate.

[0054] Furthermore, as Figure 4 shown, the end of the socket 3 away from the catheter 1 is provided with an external thread 13. The external thread 13 is used to cooperate with a Luer connector to connect other devices or instruments.

[0055] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", 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 expressions 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.

[0056] 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.

[0057] 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 bonding catheter seat assembly, characterized in that: The invention comprises a catheter, a reinforcing tube and a tube seat, wherein the reinforcing tube is sleeved on the outside of the catheter, and an inlet cavity and an inner cavity are arranged in the tube seat, wherein the cross-sectional diameter of the inlet cavity is larger than the cross-sectional diameter of the inner cavity, one end of the reinforcing tube extends into the inlet cavity, and one end of the catheter extends into the inner cavity, wherein a first boss and a second boss are arranged in the inner cavity, and the catheter and the inner wall of the inner cavity, and the reinforcing tube and the inner wall of the inlet cavity are bonded by adhesive.

2. The adhesive-bonded catheter hub assembly according to claim 1, characterized in that: The first boss is located between the inlet cavity and the second boss, the axial cross-section of the inner cavity corresponding to the first boss is rectangular, and there is a clearance fit between the outer wall of the conduit and the inner wall of the inner cavity corresponding to the first boss.

3. The adhesive catheter seat assembly according to claim 2, characterized in that: The second boss includes three annular protrusions, the axial cross-section of the inner cavity corresponding to the annular protrusion is a quadrilateral, the upper and lower sides of the quadrilateral are concave smooth curves, the two side sides of the quadrilateral are vertical straight lines, and the three annular protrusions are arranged at equal intervals.

4. The adhesive-bonded catheter hub assembly according to claim 3, characterized in that: An outer wall of the conduit and an inner wall of the inner cavity corresponding to the second boss are in interference fit.

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

6. The adhesive-bonded catheter hub assembly according to claim 1, characterized in that: A connecting cavity is also provided in the tube seat, one end of the connecting cavity is in contact with one end of the inner cavity, and the cross-sectional diameter of the inner cavity at the connection between the connecting cavity and the inner cavity is larger than the cross-sectional diameter of the connecting cavity.

7. The adhesive-bonded catheter hub assembly according to claim 6, characterized in that: The cross-sectional diameter of the communicating cavity gradually increases in a direction away from the inner cavity.

8. The adhesive-bonded catheter hub assembly according to claim 1, characterized in that: It also includes butterfly wings, wherein there are two butterfly wings, and the two butterfly wings are symmetrically arranged on the tube seat, and the butterfly wings and the tube seat are integrated, and the tube seat and the reinforcing tube are made of polymer materials.

9. The adhesive-bonded catheter hub assembly according to claim 3, characterized in that: The outer surface of the conduit is provided with a groove which matches the annular protrusion.

10. The adhesive-bonded catheter hub assembly according to any one of claims 1 to 9, characterized in that: An end of the tube seat away from the guide tube is provided with an external thread.

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