A self-locking catheter connector

Abstract

The present application discloses a self-locking catheter connector, which relates to the technical field of catheter assembly. It includes a proximal inner tube, and an elastic member is connected inside the proximal inner tube; the elastic member is axially provided with a mounting hole for inserting a catheter; at least a part of the inner wall of the mounting hole along the axial direction is provided with a self-sealing film for abutting against the outer periphery of the catheter; the self-sealing film inclines towards the axis from one side of the proximal inner tube to the other side of the distal outer tube, forming an arc-shaped guiding inclined surface; the distal outer tube is connected to the outside of the proximal inner tube to block the elastic member; the distal outer tube has an infusion cavity communicating with the mounting hole; when the catheter is in a connected state with the proximal inner tube, a part of the liquid medicine in the infusion cavity flows into the gap formed between the mounting hole and the catheter as the pressure increases, and the arc-shaped guiding inclined surface expands towards the axis under the impact force of the liquid medicine to lock the outer periphery of the catheter; realizing the one-time installation of the catheter in place, without the need to lock the catheter by squeezing the elastic member, avoiding the clamping deformation or flattening and blocking of the catheter.

Description

Technical Field

[0001] This application belongs to the technical field of catheter assembly, and particularly relates to a self-locking catheter connector. Background Art

[0002] Catheters are usually used to transport liquids or inject drugs in the medical field. Usually, a catheter connector is provided at one end of the catheter to facilitate assembly with an infusion set or an injection device so as to transport the liquid medicine into the catheter. Therefore, after the catheter is produced, it is necessary to weld or bond the catheter connector to the end of the catheter. Some large-sized catheter connectors will be bonded or welded to one end of the catheter by the manufacturing enterprise before leaving the factory;

[0003] However, it is impossible to weld or bond the catheter connector before leaving the factory for small-sized or micro catheters. The reason is that small-sized catheters usually need to pass through the needle lumen and the endoscopic cavity, so it is impossible to weld or bond the catheter connector at the end. After welding the catheter connector, it will prevent the outer needle from passing through. For example, epidural nerve block is a widely used anesthetic method in clinical practice. A micro-sized anesthetic catheter is required during the anesthetic process. The outer diameter of the anesthetic catheter generally does not exceed 1 mm. Since the anesthetic catheter is particularly soft and has no sharp tip, it needs to enter the epidural space through the needle lumen of the epidural needle. After the anesthetic catheter is in place, the epidural needle is withdrawn from the anesthetic catheter, and then the medical staff connects the catheter connector to the end of the anesthetic catheter, and connects the infusion set and other drug injection devices through the catheter connector.

[0004] The catheter adapter usually uses an elastic member to wrap the catheter, that is, it is inserted into the inner cavity of the elastic member. Through the rotational force generated by medical staff during manual connection of the catheter adapter, axial extrusion is applied to the elastic member, causing the inner diameter of the cylindrical elastic member to shrink to wrap the catheter, or directly applying pressure to the elastic member in the radial direction during manual connection of the catheter adapter to wrap the catheter with the elastic member. Therefore, in order to facilitate medical staff to manually insert the catheter into the inner cavity of the elastic member, the inner cavity of the elastic member is usually made relatively large, and medical staff need to rotate multiple circles to achieve a reduction in the inner diameter of the elastic member. However, during the rotation of the catheter adapter, due to different operating forces and speeds of medical staff, at least a certain section or a certain local area of the cylindrical elastic member will be kinked, resulting in a mutation in a certain area of the elastic member and a phenomenon of becoming thinner, thereby causing local clamping and deformation or even blockage of the catheter located inside the elastic member. During the process of radially compressing the elastic member, the compressible distance is short, and the compression effect is not ideal, so it is impossible to achieve adaptive locking of catheters of different sizes. Therefore, axial compression of the elastic member is usually used to lock the catheter. Therefore, in order to achieve both non-blockage of the catheter and effective locking of the catheter, the inner diameter of the inner cavity of the elastic member will be reduced and the downward pressure distance will be reduced to facilitate extrusion. However, such a setting will result in a high dimensional matching degree of the catheter, and the size range of catheters applicable to the same catheter adapter is very small, and only catheters of specific sizes can be locked. Moreover, it is easy to cause locking failure due to the dimensional tolerance between the elastic member and the catheter, resulting in discomfort in cooperation.

[0005] In addition, there are also ways to reduce the probability of the catheter adapter blocking the catheter, such as increasing the pitch of the thread, adding a limiting device, or increasing the elastic deformation amount of the elastic member. However, the manufacturing difficulty increases, the production cost increases, the structure becomes more complex, the space for adapting to the deformation of the elastic member needs to be increased accordingly, and the structure needs to be changed. Moreover, the above changes are only applicable to catheters of fixed sizes. Once the outer diameter of the catheter is too large or too small, the catheter adapter cannot lock the catheter, resulting in a decrease in the adaptability between the catheter and the catheter adapter, which is not conducive to rapid assembly and application. Summary of the Invention

[0006] The present application provides a self-locking catheter adapter to solve the above technical problems, that is, due to different operating forces and speeds of medical staff, at least a certain section or a certain local area of the cylindrical elastic member will be kinked, resulting in a mutation in a certain area of the elastic member and a phenomenon of becoming thinner, thereby causing local clamping and deformation or even blockage of the catheter located inside the elastic member; the size range of catheters applicable to the same catheter adapter is very small, and only catheters of specific sizes can be locked.

[0007] The technical solution adopted by the present application is as follows:

[0008] A self-locking catheter adapter for assembling an anesthesia catheter, comprising:

[0009] A proximal inner tube, with an elastic member connected therein;

[0010] An elastic member, which is axially provided with a mounting hole for inserting a catheter; at least part of the inner wall of the mounting hole in the axial direction is provided with a self-sealing film for abutting against the outer periphery of the catheter; the self-sealing film inclines towards the axis from one side of the proximal inner tube to one side of the distal outer tube, forming an arc-shaped guiding inclined surface;

[0011] A distal outer tube, which is connected to the outside of the proximal inner tube to seal the elastic member; the distal outer tube has an infusion cavity communicated with the mounting hole;

[0012] When the catheter is in a connected state with the proximal inner tube, as the pressure of the liquid medicine in the infusion cavity increases, a part of the liquid medicine that has not entered the catheter flows into the gap formed between the mounting hole and the catheter, and the arc-shaped guiding inclined surface expands towards the axis under the impact force of the liquid medicine to lock the outer periphery of the catheter.

[0013] A self-locking catheter connector of the present application further has the following additional technical features:

[0014] A plurality of barbs protruding from the wall surface are also connected in the mounting hole along the axial direction, and the barbs are distributed at intervals or non-intervals in the circumferential direction of the mounting hole; the barbs incline towards the distal outer tube side to limit the catheter from sliding towards the proximal inner tube side along the axis of the mounting hole.

[0015] The proximal inner tube has a bullet-shaped structure, the proximal inner tube has a bullet-shaped mounting inner cavity, the shape of the elastic member is adapted to the shape of the mounting inner cavity, and the mounting inner cavity forms an elastic member mounting position for mounting the elastic member.

[0016] The proximal inner tube has a thin end and a thick end arranged oppositely, the thick end is connected to the distal outer tube, one side of the thin end has an insertion opening for the catheter corresponding to the mounting hole, one side of the thick end has an insertion interface corresponding to the mounting hole, and the inner diameter of the insertion interface is smaller than the inner diameter of the catheter so that the end face of the catheter abuts against the outer periphery of the insertion interface.

[0017] The proximal inner tube includes a connected inner tube end and an inner tube connection end; the inner tube end has a flared opening; the inner tube connection end is used to connect with the distal outer tube, and a sealed inner cavity for sealing the elastic member is formed between the inner tube connection end and the distal outer tube. One side of the sealed inner cavity communicates with the flared opening, and the other side communicates with the infusion cavity. The side of the infusion cavity facing the inner tube connection end has a communication port corresponding to the mounting hole, and the inner diameter of the communication port is smaller than the inner diameter of the catheter, so that the catheter is inserted into the mounting hole from the side of the flared opening and abuts against the outer periphery of the communication port.

[0018] The infusion cavity is in the shape of a tapered hole, with the small end of the infusion cavity close to the proximal inner tube and the large end of the infusion cavity away from the proximal inner tube; a communication port communicating with the catheter is provided at the small end of the infusion cavity.

[0019] The proximal inner tube and the distal outer tube are connected to form an integrated structure; or, the proximal inner tube and the distal outer tube are detachably connected.

[0020] The distal outer tube includes an extension end and a fixed end. The extension end can be sleeved and connected to the outside of the proximal inner tube, or the distal outer tube includes a fixed end that can be connected to the outside of the proximal inner tube; the fixed end can be connected to the proximal inner tube along the axial direction to form a sealed end of the elastic member, and the infusion cavity is provided in the fixed end.

[0021] When the proximal inner tube and the distal outer tube can form a detachable connection, the extension end can be detachably connected to the outside of the proximal inner tube; or, the fixed end can be detachably connected to the outside of the proximal inner tube; when the proximal inner tube and the distal outer tube form an integrated connection, the extension end is fixedly connected to the outer periphery of the proximal inner tube, and the fixed end is fixedly connected to the end of the proximal inner tube; or, the fixed end is fixedly connected to the end of the proximal inner tube.

[0022] The self-sealing film is annularly connected to the circumferential surface of the inner wall of the mounting hole; or, a plurality of self-sealing films are connected along the circumferential surface of the inner wall of the mounting hole to form an annular structure, and each self-sealing film is in an arc shape.

[0023] Due to the adoption of the above technical solutions, the beneficial effects obtained by this application are:

[0024] 1. A self-locking catheter connector for assembling an anesthesia catheter, comprising a proximal inner tube, an elastic member, and a distal outer tube; an elastic member is connected inside the proximal inner tube; the elastic member is axially provided with a mounting hole for inserting and plugging the catheter; at least a partial area of the inner wall of the mounting hole along the axial direction is provided with a self-sealing film for abutting against the outer periphery of the catheter; the self-sealing film inclines towards the axis from one side of the proximal inner tube to one side of the distal outer tube, forming an arc-shaped guiding inclined surface; the distal outer tube is connected to the outside of the proximal inner tube to block the elastic member; the distal outer tube has an infusion cavity communicated with the mounting hole; when the catheter is in a connected state with the proximal inner tube, as the pressure of the liquid medicine in the infusion cavity increases, a part of the liquid medicine that has not entered the catheter flows into the gap formed between the mounting hole and the catheter, and the arc-shaped guiding inclined surface expands towards the axis under the impact force of the liquid medicine to lock the outer periphery of the catheter.

[0025] When the catheter is inserted into the mounting hole and passes through the self-sealing film, the self-sealing film can wrap the outer periphery of the catheter under the elastic action. When the liquid medicine in the infusion cavity enters the catheter in the mounting hole, as the pressure of the liquid medicine increases, the liquid medicine will impact the catheter and the peripheral wall of the mounting hole, causing part of the liquid medicine to flow into the gap between the catheter and the mounting hole. This liquid medicine does not enter the catheter but flows into the gap between the catheter and the inner wall of the mounting hole. Since the self-sealing film inclines towards the axis from one side of the proximal inner tube to one side of the distal outer tube, the arc-shaped guiding inclined surface formed by it faces the distal outer tube. Therefore, when the liquid medicine in the infusion cavity enters the gap between the catheter and the mounting hole, it can impact the arc-shaped guiding inclined surface. Under the impact force of the liquid medicine, the arc-shaped guiding inclined surface further expands towards the axis, and the area of the arc-shaped guiding inclined surface in the radial direction of the mounting hole increases. Therefore, the outer wall of the catheter in the axial direction of the mounting hole is further locked, further realizing the fastening of the catheter.

[0026] The catheter of the present application can be directly inserted into the end of the mounting hole to realize the positioning of the catheter and the one-time installation of the catheter in place, without having to squeeze the elastic member to lock the catheter. That is, the present application can avoid the traditional need to rotate the catheter connector to convert the rotational force of the catheter connector into the extrusion force for axially squeezing the elastic member, so that the elastic member generates radial compression, thereby avoiding the phenomenon that the catheter is clamped and deformed or flattened due to local kinking or knotting during the extrusion of the elastic member. There is also no need to make the inner diameter of the inner cavity of the elastic member very small. Due to the setting of the self-sealing film, it can be applicable to catheters of various size specifications, improving the adaptability to the size of the catheter, realizing both the locking of catheters of various sizes and avoiding the extrusion deformation or flattening of the catheter during the locking process of the catheter, achieving the effect of rapid insertion and locking in place of the catheter, and improving the user experience.

[0027] 2. As a preferred embodiment of the present application, a plurality of barbs protruding from the wall surface are further connected along the axial direction inside the mounting hole, and the barbs are distributed at intervals or non-intervals in the circumferential direction of the mounting hole; the barbs are inclined towards the distal outer tube side to limit the catheter from sliding towards the proximal inner tube side along the axial direction of the mounting hole.

[0028] The barbs are connected to the wall surface of the mounting hole in an inclined shape, aiming to further enhance the locking of the outer periphery of the catheter inserted into the mounting hole. When the catheter is inserted into the mounting hole, due to the inclined setting and elasticity of the barbs, the outer periphery of the catheter can be immediately locked. The barbs will produce corresponding deformations, and different degrees of deformation will be generated according to different sizes of the catheter to achieve the abutting connection with the outer peripheral surface of the catheter, so as to achieve the installation in place when the catheter reaches the end of the mounting hole. There is no need for the traditional method of rotating the catheter joint to generate an extrusion effect in the axial direction of the elastic member to cause the elastic member to be compressed and deformed to wrap the catheter. Instead, it can be inserted in place at once, realizing the rapid assembly of the catheter.

[0029] 3. As a preferred embodiment of the present application, the proximal inner tube has a thin end and a thick end arranged oppositely. The thick end is connected to the distal outer tube. One side of the thin end has an insertion port for the catheter corresponding to the mounting hole, and one side of the thick end has an insertion interface corresponding to the mounting hole. The inner diameter of the insertion interface is smaller than the inner diameter of the catheter so that the end face of the catheter abuts against the outer periphery of the insertion interface.

[0030] The proximal inner tube has an insertion port at the thin end and an insertion interface at the thick end, and the inner diameter of the insertion interface is smaller than the inner diameter of the catheter. Thus, during use, when the catheter enters the mounting hole of the elastic member from the insertion port, the end of the catheter abuts against and is connected to the outer periphery of the insertion interface and will not extend out of the insertion interface. The setting of the insertion interface enables the catheter in the mounting hole to communicate with the infusion cavity, so that the liquid medicine in the infusion cavity can smoothly enter the catheter in the mounting hole from the infusion cavity.

[0031] 4. As a preferred embodiment of the present application, the proximal inner tube includes a connected inner tube end head and an inner tube connection end; the inner tube end head has a flared opening; the inner tube connection end is used to connect with the distal outer tube. A sealed inner cavity for sealing the elastic member is formed between the inner tube connection end and the distal outer tube. One side of the sealed inner cavity is connected to the flared opening, and the other side is connected to the infusion cavity. One side of the infusion cavity facing the inner tube connection end has a communication port corresponding to the mounting hole. The inner diameter size of the communication port is smaller than the inner diameter of the catheter, so that the catheter is inserted into the mounting hole from the flared opening side and abuts against the outer periphery of the communication port.

[0032] The purpose of the trumpet-shaped opening at the end of the inner tube is to facilitate manual operation by medical staff when inserting the catheter into the installation hole. There should be sufficient space to accommodate the hand at the insertion position because the outer opening of the trumpet-shaped opening is larger, which is conducive to hand movement. Moreover, the trumpet-shaped opening makes the inner wall of the end of the inner tube have an arc-shaped guiding surface. Even if the position of the catheter entering the trumpet-shaped opening is not exactly at the axis position of the installation hole, it can still be smoothly inserted into the installation hole under the guiding action of the arc-shaped guiding surface. The purpose of forming a sealed inner cavity between the connection end of the inner tube and the distal outer tube is to enable the end of the elastic member to be completely wrapped. The distal outer tube can seal the end of the connection end of the inner tube, so as to firmly fix the elastic member in the sealed inner cavity. Since the installation hole needs to communicate with the trumpet-shaped opening to facilitate the catheter to enter the installation hole from the trumpet-shaped opening, and the installation hole also needs to communicate with the infusion cavity, a communication port corresponding to the installation hole is provided on the distal outer tube to facilitate the liquid medicine in the infusion cavity to flow through the communication port into the installation hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0034] Figure 1 is a schematic diagram of the overall structure of a self-locking catheter connector under an embodiment of the present application;

[0035] Figure 2 is a schematic diagram of the overall structure of a self-locking catheter connector under another embodiment of the present application;

[0036] In the figure,

[0037] 1, proximal inner tube; 2, elastic member; 3, distal outer tube; 4, installation hole; 5, self-sealing film; 6, barbs; 7, catheter; 8, infusion cavity; 9, extension end; 10, fixed end; 11, communication port. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] In order to more clearly explain the overall concept of the present application, the following will be described in detail by way of examples in conjunction with the drawings of the specification.

[0039] In the following description, many specific details are set forth in order to fully understand the present application. However, the present application may be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0040] In addition, in the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0041] In the present application, unless otherwise clearly defined and limited, terms such as "installed", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present application, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to terms such as "embodiment", "example", "an embodiment", "example", or "specific example" 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 application. 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.

[0043] A self-locking catheter connector is used for assembling a catheter 7 for anesthesia, such as Figure 1-2 shown, and includes a proximal inner tube 1, an elastic member 2, and a distal outer tube 3; an elastic member is connected inside the proximal inner tube 1; the elastic member is axially provided with a mounting hole 4 for inserting and plugging the catheter 7; at least a partial area of the inner wall of the mounting hole 4 in the axial direction is provided with an elastic self-sealing film 5 for abutting against the outer circumference of the catheter 7; the self-sealing film 5 inclines towards the axis from one side of the proximal inner tube 1 to one side of the distal outer tube 3 to form an arc-shaped guiding inclined surface; the distal outer tube 3 is connected to the outside of the proximal inner tube 1 to block the elastic member 2; the distal outer tube 3 has an infusion cavity 8 communicating with the mounting hole 4;

[0044] When the catheter 7 is in a connected state with the proximal inner tube 1, part of the liquid medicine that has not entered the catheter 7 flows into the gap formed between the mounting hole 4 and the catheter 7 as the pressure of the liquid medicine in the infusion cavity 8 increases, and the arc-shaped guiding inclined surface expands towards the axis under the impact force of the liquid medicine to lock the outer circumference of the catheter 7.

[0045] The catheter 7 is inserted into the mounting hole 4. Since the catheter 7 is adapted to the inner diameter of the mounting hole 4 and they have the same inner diameter size, once the catheter 7 is inserted into the mounting hole 4, the elastic action of the self-sealing film 5 can wrap the outer periphery of the catheter 7. The liquid medicine in the infusion cavity 8 enters the catheter 7 in the mounting hole 4 through the infusion cavity 8. When the pressure of the liquid medicine increases, the liquid medicine will impact the catheter 7 and the peripheral wall of the mounting hole 4, causing some liquid medicine to flow into the gap between the catheter 7 and the mounting hole 4. This liquid medicine does not enter the catheter 7 but flows into the gap between the catheter 7 and the inner wall of the mounting hole 4. Since the self-sealing film 5 is inclined from the proximal inner tube 1 side towards the distal outer tube 3 side towards the axis, the formed arc-shaped guiding inclined surface faces the distal outer tube 3. Therefore, when the liquid medicine in the infusion cavity 8 enters the gap between the catheter 7 and the mounting hole 4, it can impact the arc-shaped guiding inclined surface. Under the impact force of the liquid medicine, the arc-shaped guiding inclined surface further expands towards the axis, and the area of the arc-shaped guiding inclined surface in the radial direction of the mounting hole 4 increases. Thus, the outer wall of the catheter 7 in the axial direction of the mounting hole 4 is further locked, further realizing the fastening of the catheter 7.

[0046] The positioning of the catheter 7 of the present application can be achieved by directly inserting the end of the catheter 7 into the mounting hole 4, realizing the one-time installation in place of the catheter 7 without the need to lock the catheter 7 by squeezing the elastic member 2. That is, the present application can avoid the traditional need to rotate the joint of the catheter 7, converting the rotational force of the joint of the catheter 7 into the squeezing force for squeezing the elastic member 2 in the axial direction, causing the elastic member 2 to generate compression in the radial direction, thereby avoiding the phenomenon that the catheter 7 is clamped and deformed or flattened due to local kinking or knotting during the squeezing process of the elastic member 2. Nor is it necessary to make the inner diameter size of the inner cavity of the elastic member 2 very small. Due to the setting of the self-sealing film 5, it can be applicable to catheters 7 of various size specifications, improving the adaptability to the size of the catheter 7, realizing both the locking of catheters 7 of various sizes and avoiding the extrusion deformation or flattening of the catheter 7 during the locking process of the catheter 7, achieving the effect of quickly inserting and locking the catheter 7 in place, and improving the user experience.

[0047] Furthermore, the self-sealing film 5 is an elastic film, and the self-sealing film 5 is annularly connected to the peripheral surface of the inner wall of the mounting hole 4; or, a plurality of self-sealing films 5 are connected along the peripheral surface of the inner wall of the mounting hole 4 to form an annular structure, and each self-sealing film 5 is in an arc-shaped structure.

[0048] The self-sealing film 5 can be in a conical structure. The small end of its conical structure is connected to the peripheral surface of the mounting hole 4, while the large end of the conical structure is separated from the peripheral surface of the mounting hole 4 and forms an inclined angle with the peripheral surface of the mounting hole 4. The outer peripheral surface of the self-sealing film 5 in the conical structure is a convex arc surface. Therefore, the self-sealing film 5 located in the mounting hole 4 has an arc-shaped guiding inclined surface. The small end of the self-sealing film 5 in the conical structure faces the catheter 7, and the large end of the self-sealing film 5 in the conical structure faces the distal outer tube 3. The infusion cavity 8 of the distal outer tube 3 is communicated with the mounting hole 4. Under the action of a large impact force, the catheter 7 and the hole wall of the mounting hole 4 will separate by a small distance, resulting in a certain small gap in the radial direction between the catheter 7 and the hole wall of the mounting hole 4, that is, a small gap will be generated under the action of the large pressure of the liquid medicine in the infusion cavity 8. The liquid medicine will enter the gap and impact the arc-shaped guiding inclined surface of the self-sealing film 5. The arc-shaped guiding inclined surface was originally in an inclined state, and when the inclined side is subjected to an impact force, the degree of inclination will increase, so that the arc-shaped guiding inclined surface side of the self-sealing film 5 will further expand towards the axial center direction and can further wrap and fasten the outer periphery of the catheter 7, thereby improving the locking and positioning of the catheter 7.

[0049] Furthermore, since the self-sealing film 5 is a thin and elastic film, when facing the impact of the liquid medicine, the arc-shaped guiding inclined surface expands towards the axial center and is closer to the axial center, so the distance from the outer peripheral surface of the catheter is further shortened, further locking the outer peripheral surface of the catheter, making the catheter firmly stable in the mounting hole. Moreover, because the self-sealing film is a thin and elastic film, its stiffness is lower than that of the catheter, so it will not squeeze the catheter and cause deformation of the catheter, but only plays a role in further locking the catheter. Thus, even when the liquid medicine has a large pressure, or the medical staff uses a large force, or the impact force of the liquid medicine in the infusion device is large, or a large conveying pressure suddenly occurs, the catheter will not deform, further enhancing the locking and stability ability of the catheter.

[0050] In addition, in another embodiment, the self-sealing films 5 can be distributed at intervals or non-uniformly along the outer peripheral direction of the mounting hole 4. Each individual self-sealing film 5 among the multiple self-sealing films 5 surrounding the peripheral surface of the mounting hole 4 in a ring shape can be in a fan-shaped structure, and the side of the fan-shaped self-sealing film 5 facing the distal outer tube 3 has an arc-shaped guiding inclined surface.

[0051] In addition, in another embodiment, the self-sealing film 5 can be spirally wound and connected in the mounting hole 4 along the axial direction of the mounting hole 4.

[0052] With the self-locking catheter connector designed in the present application, when medical staff use relatively large force to inject, a certain tiny flow gap will appear in the originally tiny space between the catheter and the mounting hole under the large impact of the drug liquid, so that the drug liquid will flow in this flow gap, and the inner wall of the mounting hole has a self-sealing membrane inclined toward the infusion end, so that the self-sealing membrane will expand toward the axis under the impact force of the drug liquid, that is, the radial dimension of the self-sealing membrane will increase, thereby further locking the outer wall of the catheter, so that even under high pressure, the catheter will not be deformed or twisted or separated from the mounting hole, but will be more tightly connected to the mounting hole, so that the catheter is effectively positioned in the mounting hole.

[0053] As a preferred embodiment, a plurality of barbs 6 protruding from the wall are connected to the mounting hole 4 along the axial direction, and the barbs 6 are distributed circumferentially at intervals or non-intervals along the mounting hole 4; the barbs 6 are inclined toward the distal outer tube 3 to limit the catheter 7 from sliding along the axial direction of the mounting hole 4 toward the proximal inner tube 1.

[0054] The barb 6 is connected to the wall of the mounting hole 4 in an inclined shape, with the purpose of further enhancing the locking of the outer periphery of the catheter 7 inserted into the mounting hole 4. When the catheter 7 is inserted into the mounting hole 4, the barb 6 is inclined and elastic and can instantly lock the outer periphery of the catheter 7. The barb 6 will produce corresponding deformation, and produce corresponding different degrees of deformation according to the different sizes of the catheter 7 to achieve abutment connection with the outer peripheral surface of the catheter 7, so that the catheter 7 can be installed in place when the end of the mounting hole 4 is inserted. There is no need for the traditional method of rotating the catheter joint to produce an axial squeezing effect on the elastic part 2 so that the elastic part 2 is compressed and deformed to wrap the catheter 7. Instead, it can be inserted into place, thereby achieving rapid assembly of the catheter 7.

[0055] As a preferred embodiment, the proximal inner tube 1 has a bullet-shaped structure, and has a bullet-shaped installation cavity inside the proximal inner tube 1. The shape of the elastic member 2 is adapted to the shape of the installation cavity, and the installation cavity forms an elastic member 2 installation position for installing the elastic member 2.

[0056] There are many implementations that can be used for the structure of the proximal inner tube 1, which are not limited by the present application. In the present application, any of the following implementations can be used:

[0057] Embodiment 1: The proximal inner tube 1 has a thin end and a thick end that are relatively arranged, the thick end is connected to the distal outer tube 3, one side of the thin end has an insertion port for the catheter 7 corresponding to the mounting hole 4, and one side of the thick end has an insertion port corresponding to the mounting hole 4, and the inner diameter of the insertion port is smaller than the inner diameter of the catheter 7 so that the end face of the catheter 7 abuts against the outer periphery of the insertion port.

[0058] The thin end of the proximal inner tube 1 has an insertion port, and the thick end has an insertion interface. The inner diameter of the insertion interface is smaller than the inner diameter of the catheter 7. Thus, during use, when the catheter 7 enters the mounting hole 4 of the elastic member 2 from the insertion port, the end of the catheter 7 abuts and connects to the outer periphery of the insertion interface and will not extend beyond the insertion interface. The setting of the insertion interface enables the catheter 7 in the mounting hole 4 to communicate with the infusion cavity 8, so that the liquid medicine in the infusion cavity 8 can smoothly enter the catheter 7 in the mounting hole 4 from the infusion cavity 8.

[0059] Embodiment 2: The proximal inner tube 1 includes a connected inner tube end and an inner tube connection end; the inner tube end has a flared opening; the inner tube connection end is used to connect with the distal outer tube 3, and a sealing inner cavity for sealing the elastic member 2 is formed between the inner tube connection end and the distal outer tube 3. One side of the sealing inner cavity communicates with the flared opening, and the other side communicates with the infusion cavity 8. One side of the infusion cavity 8 facing the inner tube connection end has a communication port 11 corresponding to the mounting hole 4, and the inner diameter of the communication port 11 is smaller than the inner diameter of the catheter 7, so that the catheter 7 is inserted into the mounting hole 4 from the flared opening side and abuts against the outer periphery of the communication port 11.

[0060] The purpose of the inner tube end having a flared opening is that when it is convenient for medical staff to manually insert the catheter 7 into the mounting hole 4, there is sufficient space to accommodate the hand at the position of the insertion port. Because the outer opening of the flared opening is larger, it is conducive to hand movement. Moreover, the flared opening makes the inner wall of the inner tube end have an arc-shaped guiding surface. Even if the position of the catheter 7 entering the flared opening is not exactly at the axis position of the mounting hole 4, it can be smoothly inserted into the mounting hole 4 under the guiding action of the arc-shaped guiding surface; the purpose of forming a sealing inner cavity between the inner tube connection end and the distal outer tube 3 is to enable the end of the elastic member 2 to be completely wrapped, and the distal outer tube 3 can seal the end of the inner tube connection end, so as to fix the elastic member 2 firmly in the sealing inner cavity; since the mounting hole 4 needs to communicate with the flared opening to facilitate the catheter 7 to enter the mounting hole 4 from the flared opening; the mounting hole 4 also needs to communicate with the infusion cavity 8, so a communication port 11 corresponding to the mounting hole 4 is provided on the distal outer tube 3 to facilitate the liquid medicine in the infusion cavity 8 to flow from the infusion cavity 8 through the communication port 11 into the mounting hole 4.

[0061] As a preferred embodiment, the infusion cavity 8 is in the shape of a tapered hole. The small end of the infusion cavity 8 is close to the proximal inner tube 1, and the large end of the infusion cavity 8 is far from the proximal inner tube 1; a communication port 11 communicating with the catheter 7 is provided at the small end of the infusion cavity 8.

[0062] The conical infusion cavity 8 can fasten infusion sets with different radial dimensions. Since the inner diameter of the conical infusion cavity 8 gradually increases from the side of the catheter 7 to the outer side of the distal outer tube 3, the infusion set inserted into the infusion cavity 8 from the side of the distal outer tube 3 is clamped by the gradually shrinking radial inner wall as it moves deeper into the infusion cavity 8. This improves the size range of the infusion sets assembled in the infusion cavity 8 and enhances the adaptability of the entire self-locking catheter connector. The conical infusion cavity 8 has a smaller-diameter end and a larger-diameter end. The smaller-diameter end is the small end of the infusion cavity 8, and the larger-diameter end is the large end of the infusion cavity 8. The small-end side is close to the catheter 7, and the large-end side faces the outer side of the distal outer tube 3. Therefore, a communication port 11 is provided on the small-end side to connect the infusion cavity 8 with the mounting hole 4, allowing the liquid medicine in the infusion cavity 8 to enter the catheter 7 in the mounting hole 4 through the communication port 11.

[0063] As a preferred embodiment, the proximal inner tube 1 and the distal outer tube 3 are connected to form an integrated structure; alternatively, the proximal inner tube 1 and the distal outer tube 3 are detachably connected.

[0064] In this application, when the proximal inner tube 1 and the distal outer tube 3 are connected to form an integrated structure, the elastic member 2 is already sealed between the proximal inner tube 1 and the distal outer tube 3 before leaving the factory, and the distal outer tube 3 and the proximal inner tube 1 can fasten the elastic member 2, preventing the elastic member 2 from being compressed and deformed between the proximal inner tube 1 and the distal outer tube 3. When the catheter 7 has been inserted into the mounting hole 4 of the elastic member 2 and reaches the end position, it can be installed immediately, without the catheter 7 being flattened or blocked due to the compression deformation of the elastic member 2.

[0065] In another embodiment, the proximal inner tube 1 and the distal outer tube 3 are connected to form a detachable structure, enabling the proximal inner tube 1 and the distal outer tube 3 to be separately disassembled and replaced. The elastic member 2 is located in the mounting inner cavity of the proximal inner tube 1, and the other end of the elastic member 2 in the axial direction is sealed by the distal outer tube 3, thus sealing the elastic member 2 in the sealed inner cavity formed by the proximal inner tube 1 and the distal outer tube 3.

[0066] Regarding the structure of the distal outer tube 3, it is not limited to the content listed in this application. The structure of the distal outer tube 3 in this application can adopt any of the following embodiments:

[0067] Embodiment 1: The distal outer tube 3 includes an extension end 9 and a fixed end 10, and the extension end 9 can be sleeved and connected to the outside of the proximal inner tube 1.

[0068] As Figure 1As shown, the extension end 9 of the distal outer tube 3 is located on the left side of the figure, and the fixed end 10 is located on the right side of the figure. The extension end 9 and the fixed end 10 are connected to form the structure of the distal outer tube 3. The purpose of the extension end 9 is to be detachably or fixedly connected to the outer periphery of the proximal inner tube 1. The purpose of the fixed end 10 is to seal the right end of the proximal inner tube 1 when the right side of the proximal inner tube 1 is an open structure. The extension end 9 is connected to the proximal inner tube 1. Even if the right side of the proximal inner tube 1 is not an open structure, the proximal inner tube 1 can be further fixed to increase the contact area with the proximal inner tube 1 and improve the connection strength. When the right end of the proximal inner tube 1 is an open structure, by connecting the distal outer tube 3, the end of the fixed end 10 of the distal outer tube 3 and the proximal inner tube 1 form the sealed inner cavity of the sealing elastic member 2. The left end of the fixed end 10 can fix the right end face of the elastic member 2, so as to ensure the positioning position of the elastic member 2 in the installation inner cavity of the proximal inner tube 1 and ensure the positioning and locking of the catheter 7.

[0069] Further, the detachable connection method of the extension end 9 and the proximal inner tube 1 includes, but is not limited to, threaded connection, snap connection, or connection with a slot and a buckle in cooperation. For example, when using threaded connection, an internal thread can be provided inside the extension end 9, and an external thread can be provided on the outer periphery of the proximal inner tube 1. The extension end 9 is sleeved and connected to the outside of the proximal inner tube 1 through thread cooperation.

[0070] Further, the method of fixedly connecting the extension end 9 and the proximal inner tube 1 includes welding the extension end 9 to the outer periphery of the proximal inner tube 1 to wrap at least a part of the outer periphery of the proximal inner tube 1 and enhance the connection strength of the connection part of the catheter 7 joint.

[0071] Embodiment 2: The distal outer tube 3 includes a fixed end 10, and the fixed end 10 can be connected to the outside of the proximal inner tube 1; the fixed end 10 can be axially connected to the proximal inner tube 1 to form the sealed end of the elastic member 2, and the infusion cavity 8 is provided inside the fixed end 10.

[0072] As Figure 2 shown, the distal outer tube 3 includes a fixed end 10, and the fixed end 10 can be detachably or fixedly connected to the outside of the proximal inner tube 1, so that the left end of the fixed end 10 seals the right end of the proximal inner tube 1, and a sealed inner cavity of the fastening elastic member 2 is formed between the proximal inner tube 1 and the fixed end 10, that is, the right end of the elastic member 2 in the axial direction can abut and connect to one side of the fixed end 10, so that the elastic member 2 can be limited and positioned in the sealed inner cavity, thereby further improving the locking of the catheter 7.

[0073] Wherein, when the fixed end 10 is detachably connected to the proximal inner tube 1, the fixed end 10 can be fixedly connected to the end of the proximal inner tube 1 through the cooperation of a buckle and a slot; or a clamp is connected between the fixed end 10 and the proximal inner tube 1 to form a detachable connection between the fixed end 10 and the proximal inner tube 1.

[0074] Wherein, when the fixed end 10 is fixedly connected to the proximal inner tube 1, the fixed end 10 and the proximal inner tube 1 are integrally formed by welding.

[0075] As a preferred embodiment, at least one pair of first lugs are symmetrically arranged along the radial direction on the outer periphery of the proximal inner tube 1, and at least one pair of second lugs are symmetrically arranged along the radial direction on the distal outer tube 3.

[0076] The operation positions for manually operating the proximal inner tube 1 and the distal outer tube 3 are realized through the first lugs on the outer side of the proximal inner tube 1 and the second lugs on the outer side of the distal outer tube 3, which facilitates the detachable connection and taking of the proximal inner tube 1 and the distal outer tube 3. For example, when an infusion set needs to be installed in the infusion cavity 8, one hand can hold the second lug, and the other hand can hold the infusion set and insert it into the infusion cavity 8, so as to facilitate the manual operation of medical staff and realize rapid assembly.

[0077] What is not described in this application can be realized by adopting or referring to the existing technology.

[0078] Each embodiment in this specification is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other, and the key point of each embodiment is to illustrate the differences from other embodiments.

[0079] The above are only the embodiments of this application and are not used to limit this application. For those skilled in the art, various changes and modifications can be made to this application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the scope of the claims of this application.

Claims

1. A self-locking catheter connector for assembling a catheter for anesthesia, characterized in that, Comprising: A proximal inner tube, with an elastic member connected therein; An elastic member, which is axially provided with a mounting hole for inserting a catheter; at least a partial area of the inner wall of the mounting hole along the axial direction is provided with a self-sealing film for abutting against the outer periphery of the catheter; the self-sealing film inclines towards the axis from one side of the proximal inner tube to the other side of the distal outer tube, forming an arc-shaped guiding inclined surface; A distal outer tube, which is connected to the outside of the proximal inner tube to block the elastic member; the distal outer tube has an infusion cavity communicating with the mounting hole; When the catheter is in a connected state with the proximal inner tube, as the pressure of the liquid medicine in the infusion cavity increases, a part of the liquid medicine that has not entered the catheter flows into the gap formed between the mounting hole and the catheter, and the arc-shaped guiding inclined surface expands towards the axis under the impact force of the liquid medicine to lock the outer periphery of the catheter, realizing the fastening of the catheter.

2. The self-locking catheter connector according to claim 1, characterized in that, Along the axial direction in the mounting hole, a plurality of barbs protruding from the wall surface are further connected, and the barbs are distributed at intervals or non-intervals along the circumferential direction of the mounting hole; the barbs incline towards the distal outer tube side to limit the catheter from sliding towards the proximal inner tube side along the axis of the mounting hole.

3. The self-locking catheter connector according to claim 1, wherein, The proximal inner tube has a bullet-shaped structure, and the proximal inner tube has a bullet-shaped mounting inner cavity, and the shape of the elastic member is adapted to the shape of the mounting inner cavity, and the mounting inner cavity forms an elastic member mounting position for mounting the elastic member.

4. The self-locking catheter connector according to claim 1, wherein, The proximal inner tube has a thin end and a thick end arranged oppositely, the thick end is connected to the distal outer tube, one side of the thin end has an insertion port of the catheter corresponding to the mounting hole, and one side of the thick end has an insertion interface corresponding to the mounting hole, and the inner diameter of the insertion interface is smaller than the inner diameter of the catheter so that the end face of the catheter abuts against the outer periphery of the insertion interface.

5. The self-locking catheter connector according to claim 1, characterized in that, The proximal inner tube includes a connected inner tube end head and an inner tube connection end; the inner tube end head has a flared opening; the inner tube connection end is used for connecting to the distal outer tube, and a sealing inner cavity for sealing the elastic member is formed between the inner tube connection end and the distal outer tube, one side of the sealing inner cavity is communicated with the flared opening, and the other side is communicated with the infusion cavity, and one side of the infusion cavity facing the inner tube connection end has a communication port corresponding to the mounting hole, and the inner diameter size of the communication port is smaller than the inner diameter of the catheter, so that the catheter is inserted into the mounting hole from the flared opening side and abuts against the outer periphery of the communication port.

6. The self-locking catheter connector according to claim 5, characterized in that The infusion cavity is in a tapered hole shape, the small end of the infusion cavity is close to the proximal inner tube, and the large end of the infusion cavity is far from the proximal inner tube; the small end of the infusion cavity is provided with the communication port communicating with the catheter.

7. The self-locking catheter connector according to claim 1, characterized in that, The proximal inner tube and the distal outer tube are connected to form an integral structure; or, the proximal inner tube and the distal outer tube are detachably connected.

8. The self-locking catheter connector according to claim 1, characterized in that, The distal outer tube includes an extending end and a fixed end, and the extending end can be sleeved and connected to the outside of the proximal inner tube.

9. A self-locking catheter connector according to claim 8, characterized in that When the proximal inner tube and the distal outer tube can form a detachable connection, the extending end can be detachably connected to the outside of the proximal inner tube; When the proximal inner tube and the distal outer tube form an integral connection, the extension end is fixedly connected to the outer periphery of the proximal inner tube, and the fixed end is fixedly connected to the end of the proximal inner tube.

10. A self-locking catheter connector according to claim 1, characterized in that, The distal outer tube includes a fixed end, and the fixed end can be connected to the outside of the proximal inner tube; The fixed end can be connected to the proximal inner tube in the axial direction to form a sealed end of the elastic member, and the infusion cavity is opened in the fixed end.

11. The self-locking catheter connector according to claim 10, wherein When the proximal inner tube and the distal outer tube can form a detachable connection, the fixed end can be detachably connected to the outside of the proximal inner tube; When the proximal inner tube and the distal outer tube form an integral connection, the fixed end is fixedly connected to the end of the proximal inner tube.

12. The self-locking catheter connector according to claim 1, wherein, The self-sealing film is an elastic film; or, the self-sealing film is annularly connected to the inner peripheral surface of the mounting hole.

13. The self-locking catheter connector according to claim 1, wherein, A plurality of self-sealing films are connected along the inner peripheral surface of the mounting hole to form an annular structure, and each self-sealing film is in an arc-shaped structure.

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