Self-locking conduit joint

Abstract

The invention discloses a self-locking catheter connector, and relates to the technical field of catheter assembly, the self-locking catheter connector comprises a near-end inner tube, and the near-end inner tube is internally connected with an elastic piece; the elastic piece is provided with a mounting hole for inserting a guide pipe along the axis direction; a self-sealing film used for abutting against the periphery of the guide pipe is arranged in at least part of the area of the inner wall of the mounting hole in the axis direction. The self-sealing film inclines towards the axis from one side of the near-end inner tube to one side of the far-end outer tube to form an arc-shaped guide inclined surface; the far-end outer tube is connected to the outer side of the near-end inner tube to lock the elastic piece; the far-end outer tube is provided with an infusion cavity communicated with the mounting hole; when the catheter and the near-end inner tube are connected, part of liquid medicine in the infusion cavity flows into a gap formed between the mounting hole and the catheter along with increase of pressure, and the arc-shaped guide inclined face expands towards the axis under the impact acting force of the liquid medicine so as to lock the periphery of the catheter. The catheter can be installed in place at a time, the catheter does not need to be locked by extruding an elastic piece, and clamping deformation or flattening blockage of the catheter is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of catheter assembly, and in particular relates to a self-locking catheter connector. Background Art

[0002] In the medical field, catheters are usually used to transport liquids or inject drugs, etc. Usually, a catheter connector is set at one end of the catheter to facilitate assembly with an infusion set or injection device so as to transport the drug solution into the catheter. Therefore, after the production of the catheter, the catheter end needs to be welded or bonded with the catheter connector. Some large-sized catheter connectors will be bonded or welded to one end of the catheter by the manufacturer before leaving the factory;

[0003] However, it is impossible to weld or glue the catheter joints of small-sized or micro-catheters before leaving the factory. The reason is that small-sized catheters usually need to pass through the needle cavity and laparoscope cavity, so it is impossible to weld or glue the catheter joints at the end. Welding the catheter joints will hinder the passage of the external needle. For example, epidural nerve block is an anesthesia method widely used in clinical practice. During the anesthesia process, a micro-sized anesthesia catheter is required. The outer diameter of the anesthesia catheter generally does not exceed 1 mm. Since the anesthesia catheter is particularly soft and has no sharp head, it is necessary to pass through the needle cavity channel of the epidural needle to enter the epidural space. When the anesthesia catheter is in place, the epidural needle is withdrawn from the anesthesia catheter, and then the medical staff connects the end of the anesthesia catheter to the catheter joint, and connects it to the infusion set and other drug injection devices through the catheter joint.

[0004] Catheter connectors usually use elastic parts to wrap the catheter, that is, the elastic part is inserted into the inner cavity of the elastic part, and the rotational force generated by the medical staff when manually connecting the catheter connector is applied to the elastic part in the axial direction, so that the inner diameter of the cylindrical elastic part is reduced to achieve the catheter wrapping, or pressure is directly applied to the elastic part in the radial direction when the catheter connector is manually connected to achieve the elastic part wrapping the catheter. Therefore, in order to facilitate the medical staff to manually insert the catheter into the inner cavity of the elastic part, the inner cavity of the elastic part is usually made larger. The medical staff needs to rotate it multiple times during the specific operation to achieve the reduction of the inner diameter of the elastic part. However, during the rotation of the catheter connector, due to the different operating force and speed of the medical staff, the cylindrical elastic part will produce a kink in at least a certain section or a certain local area, resulting in a sudden change in a certain area of ​​the elastic part and a phenomenon of thinning, which causes the catheter inside the elastic part to be locally clamped and deformed or even blocked. During radial compression of the elastic member, the extrusion distance is short, the extrusion effect is not ideal, and the adaptive locking of catheters of different sizes cannot be achieved. Therefore, axial compression of the elastic member is usually used to lock the catheter. Therefore, in order to achieve both no clogging of the catheter and effective locking of the catheter, the inner diameter of the inner cavity of the elastic member is reduced and the downward pressing distance is reduced to facilitate extrusion. However, such a setting will result in a high degree of size matching of the catheter. The size range of catheters that can be applied to the same catheter connector is very small, and only catheters of specific sizes can be locked. In addition, the locking failure phenomenon is prone to occur due to the dimensional tolerance between the elastic member and the catheter, which causes inappropriate matching.

[0005] There are also ways to reduce the probability of the catheter connector clogging the catheter by increasing the pitch of the thread, adding a limit device, or increasing the elastic deformation of the elastic member. However, the manufacturing difficulty increases, the production cost increases, the structure becomes more complicated, and the space for adapting the deformation of the elastic member needs to be increased accordingly, which requires structural changes. 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 connector cannot be locked to the catheter, resulting in a decrease in the fit between the catheter and the catheter connector, which is not conducive to rapid assembly and application. Summary of the invention

[0006] The present application provides a self-locking catheter connector to solve the above-mentioned technical problem that due to the different operating forces and speeds of medical staff, a cylindrical elastic part may be kinked in at least a certain section or a certain local area, causing a sudden change in a certain area of ​​the elastic part and a phenomenon of thinning, thereby causing the catheter located inside the elastic part to be locally clamped, deformed or even blocked; the same catheter connector can be applied to a very small range of catheter sizes and can only lock catheters of specific sizes.

[0007] The technical solution adopted in this application is:

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

[0009] A proximal inner tube, wherein an elastic member is connected to the proximal inner tube;

[0010] An elastic member, wherein the elastic member is provided with a mounting hole for inserting a catheter along the axial direction; a self-sealing film for abutting against the outer periphery of the catheter is provided on at least a part of the inner wall of the mounting hole along the axial direction; the self-sealing film is inclined toward the axis from the proximal inner tube side to the distal outer tube side to form an arc-shaped guiding inclined surface;

[0011] A distal outer tube, the distal outer tube being connected to the outside of the proximal inner tube to seal the elastic member; the distal outer tube having an infusion cavity connected to the mounting hole;

[0012] When the catheter is connected to the proximal inner tube, as the pressure of the medicine in the infusion cavity increases, a portion of the medicine that has not entered the catheter flows into the gap formed between the mounting hole and the catheter. The arc-shaped guide slope expands toward the axis under the impact force of the medicine to lock the outer periphery of the catheter.

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

[0014] A plurality of barbs protruding from the wall are connected to the mounting hole along the axial direction, and the barbs are distributed at intervals or non-intervals along the circumference of the mounting hole; the barbs are inclined toward the distal outer tube side to limit the catheter from sliding toward the proximal inner tube side along the axial direction of the mounting hole.

[0015] The proximal inner tube is in a bullet-shaped structure, and has a bullet-shaped installation cavity in the proximal inner tube. The shape of the elastic member matches the shape of the installation cavity, and the installation cavity forms an elastic member installation position for installing the elastic member.

[0016] The proximal inner tube has a thin end and a thick end that are relatively arranged, the thick end is connected to the distal outer tube, one side of the thin end has an insertion port for a catheter corresponding to the mounting hole, and one side of the thick end has an insertion port corresponding to the mounting hole, the inner diameter of the insertion port 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 port.

[0017] The proximal inner tube includes an inner tube end and an inner tube connecting end connected to each other; the inner tube end has a trumpet-shaped opening; the inner tube connecting end is used to connect to the distal outer tube, and a sealed inner cavity for sealing the elastic member is formed between the inner tube connecting end and the distal outer tube, one side of the sealed inner cavity is connected to the trumpet-shaped opening, and the other side is connected to the infusion cavity, and the infusion cavity has a connecting port corresponding to the mounting hole on the side facing the inner tube connecting end, and the inner diameter of the connecting port is smaller than the inner diameter of the catheter, so that the catheter can be inserted into the mounting hole from the trumpet-shaped opening side and abut against the outer periphery of the connecting port.

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

[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, and 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, 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 along the axial direction to form a sealed end of the elastic member, and the infusion cavity is opened 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 connected to the inner wall circumference of the installation hole in an annular shape; or, a plurality of self-sealing films are connected along the inner wall circumference of the installation hole to form an annular structure, and each self-sealing film is an arc-shaped structure.

[0023] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[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; the proximal inner tube is connected with an elastic member; the elastic member is provided with a mounting hole for inserting the catheter along the axial direction; at least a part of the inner wall of the mounting hole along the axial direction is provided with a self-sealing membrane for abutting the outer periphery of the catheter; the self-sealing membrane is inclined toward the axis from one side of the proximal inner tube to one side of the distal outer tube to form an arc-shaped guiding inclined surface; the distal outer tube is connected to the outer side of the proximal inner tube to block the elastic member; the distal outer tube has an infusion cavity connected to the mounting hole; when the catheter and the proximal inner tube are connected, as the pressure of the drug liquid in the infusion cavity increases, a part of the drug liquid 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 toward the axis under the impact force of the drug liquid 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 drug liquid in the infusion cavity enters the catheter in the mounting hole through the infusion cavity, as the pressure of the drug liquid increases, the drug liquid will impact the catheter and the peripheral wall of the mounting hole, causing part of the drug liquid to flow into the gap between the catheter and the mounting hole. This drug liquid 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 is inclined from the proximal inner tube side to the distal outer tube side toward the axis, the arc-shaped guiding inclined surface formed by it faces the distal outer tube. Therefore, when the drug liquid in the infusion cavity enters the gap between the catheter and the mounting hole, it can impact the arc-shaped guiding inclined surface, and the arc-shaped guiding inclined surface further expands toward the axis under the impact force of the drug liquid, and the area of ​​the arc-shaped guiding inclined surface along the radial direction of the mounting hole increases, thereby further locking the outer wall of the catheter in the axial direction of the mounting hole, and 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 achieve the positioning of the catheter, and the one-time installation of the catheter is achieved without the need to lock the catheter by squeezing the elastic member. That is, the present application can avoid the traditional need to rotate the catheter joint so that the rotational force of the catheter joint is converted into an extrusion force for squeezing the elastic member in the axial direction, so that the elastic member is compressed in the radial direction, thereby avoiding the phenomenon of the catheter being clamped, deformed or flattened due to local kinking or knotting during the squeezing of the elastic member, and there is no need to make the inner diameter of the inner cavity of the elastic member very small. Since the setting of the self-sealing film can be applicable to catheters of various sizes, the adaptability to the size of the catheter is improved, and it can be applicable to the locking of catheters of various sizes, and the phenomenon of squeezing, deformation or even flattening of the catheter caused by the locking process can be avoided, so that the catheter can be quickly inserted and locked in place, thereby improving the user experience.

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

[0028] The barbs are connected to the wall of the mounting hole in an inclined shape, so as 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, the barbs are inclined and elastic, so they can instantly lock the outer periphery of the catheter. The barbs will produce corresponding deformations, and produce corresponding degrees of deformation according to the different sizes of the catheters to achieve abutment connection with the outer peripheral surface of the catheter, so that the catheter can be installed in place when the end of the mounting hole 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 so that the elastic part is compressed and deformed to wrap the catheter. Instead, the catheter can be inserted into place once, thereby achieving 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 that are relatively arranged, 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 port corresponding to the mounting hole, and the inner diameter of the insertion port 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 port.

[0030] The thin end of the proximal inner tube has an insertion port, and the thick end has an insertion interface, and the inner diameter of the insertion interface is smaller than the inner diameter of the catheter. Therefore, when in use, after the catheter enters the mounting hole of the elastic member from the insertion port, the end of the catheter abuts and connects 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 be connected 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 an inner tube end and an inner tube connecting end connected to each other; the inner tube end has a trumpet-shaped opening; the inner tube connecting end is used to connect to the distal outer tube, and a sealed inner cavity for sealing the elastic member is formed between the inner tube connecting end and the distal outer tube, one side of the sealed inner cavity is connected to the trumpet-shaped opening, and the other side is connected to the infusion cavity, and the side of the infusion cavity facing the inner tube connecting end has a connecting port corresponding to the mounting hole, and the inner diameter of the connecting port is smaller than the inner diameter of the catheter, so that the catheter can be inserted into the mounting hole from the trumpet-shaped opening side and abut against the outer periphery of the connecting port.

[0032] The purpose of the trumpet-shaped opening at the end of the inner tube is to facilitate the medical staff to manually insert the catheter into the installation hole, so that there is sufficient space to accommodate the hand at the insertion port, because the trumpet-shaped opening has a larger outer opening to facilitate hand movement. Moreover, the trumpet-shaped opening makes the inner wall of the inner tube end have an arc-shaped guiding surface, so that even if the catheter entering the trumpet-shaped opening is not located at the axial center of the installation hole, it can be smoothly inserted into the installation hole under the guidance of the arc-shaped guiding surface; the purpose of forming a sealed inner cavity between the inner tube connecting end and the distal outer tube is to completely wrap the end of the elastic member, and the distal outer tube can seal the end of the inner tube connecting end, so that the elastic member is firmly fixed in the sealed inner cavity; since the installation hole needs to be connected with the trumpet-shaped opening to facilitate the catheter to enter the installation hole from the trumpet-shaped opening; the installation hole also needs to be connected with the infusion cavity, so a connecting port corresponding to the installation hole is provided on the distal outer tube to facilitate the flow of the liquid in the infusion cavity from the infusion cavity through the connecting 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 constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

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

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

[0036] In the figure,

[0037] 1. Proximal inner tube; 2. Elastic part; 3. Distal outer tube; 4. Mounting hole; 5. Self-sealing membrane; 6. Barb; 7. Catheter; 8. Infusion cavity; 9. Extension end; 10. Fixed end; 11. Connecting port. DETAILED DESCRIPTION

[0038] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

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

[0040] In addition, in the description of the present application, it should be understood that the terms "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, 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 specified and limited, the first feature "above" or "below" the second feature may 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 the terms "implementation method", "example", "one embodiment", "example" or "specific example" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0043] A self-locking catheter connector for assembling an anesthesia catheter 7, such as Figure 1-2 As shown, it comprises a proximal inner tube 1, an elastic member 2 and a distal outer tube 3; the proximal inner tube 1 is connected with an elastic member; the elastic member is provided with a mounting hole 4 for inserting a catheter 7 along the axial direction; at least a part of the inner wall of the mounting hole 4 along the axial direction is provided with an elastic self-sealing film 5 for abutting against the outer periphery of the catheter 7; the self-sealing film 5 is inclined toward 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 outer side of the proximal inner tube 1 to block the elastic member 2; the distal outer tube 3 has an infusion cavity 8 connected with the mounting hole 4;

[0044] When the catheter 7 is connected to the proximal inner tube 1, the pressure of the medicine in the infusion cavity 8 increases, causing a portion of the medicine that has not entered the catheter 7 to flow into the gap formed between the mounting hole 4 and the catheter 7. The arc-shaped guide slope expands toward the axis under the impact force of the medicine to lock the outer periphery of the catheter 7.

[0045] The catheter 7 is inserted into the mounting hole 4. Because the inner diameter of the catheter 7 is adapted to the inner diameter of the mounting hole 4, the catheter 7 and the inner diameter of the mounting hole 4 are the same. Therefore, once the catheter 7 is inserted into the mounting hole 4, the elastic effect of the self-sealing film 5 can wrap the outer periphery of the catheter 7, and the liquid medicine in the infusion cavity 8 enters the catheter 7 in the mounting hole 4 through the infusion cavity 8. As the pressure of the liquid medicine increases, the liquid medicine will impact the catheter 7 and the surrounding wall of the mounting hole 4, causing part of the 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 toward the distal outer tube 3 side toward the axis, the arc-shaped guiding slope formed by it faces the distal outer tube 3, so the liquid medicine in the infusion cavity 8 can impact the arc-shaped guiding slope when entering the gap between the catheter 7 and the mounting hole 4, and the arc-shaped guiding slope further expands toward the axis under the impact force of the liquid medicine, and the area of ​​the arc-shaped guiding slope along the radial direction of the mounting hole 4 increases, so the outer wall of the catheter 7 in the axial direction of the mounting hole 4 is further locked, and the catheter 7 is further fastened;

[0046] The catheter 7 of the present application can be directly inserted into the end of the mounting hole 4 to achieve the positioning of the catheter 7, and the one-time installation of the catheter 7 is achieved without the need to lock the catheter 7 by squeezing the elastic member 2. That is, the present application can avoid the traditional joint of the catheter 7 that still needs to be rotated, so that the rotational force of the joint of the catheter 7 is converted into an extrusion force that squeezes the elastic member 2 in the axial direction, so that the elastic member 2 is compressed in the radial direction, thereby avoiding the phenomenon of the catheter 7 being clamped, deformed or flattened due to local kinking or knotting during the extrusion of the elastic member 2, and there is no need to make the inner diameter of the inner cavity of the elastic member 2 very small. Since the setting of the self-sealing film 5 can be applicable to catheters 7 of various sizes and specifications, the adaptability to the size of the catheter 7 is improved, and it can be applicable to the locking of catheters 7 of various sizes, and the phenomenon of squeezing, deformation or even flattening of the catheter 7 caused by the locking process of the catheter 7 can be avoided, so that the catheter 7 can be quickly inserted and locked in place, thereby 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 inner wall of the mounting hole 4; or, multiple self-sealing films 5 are connected along the inner wall of the mounting hole 4 to form an annular structure, and each self-sealing film 5 is an arc-shaped structure.

[0048] The self-sealing membrane 5 can be a conical structure, the small end of which is connected to the circumference of the mounting hole 4, and the large end of which is separated from the circumference of the mounting hole 4 and forms a certain angle of inclination on the circumference of the mounting hole 4, and the outer circumference of the conical structure of the self-sealing membrane 5 is an outwardly convex arc surface, so the self-sealing membrane 5 located in the mounting hole 4 has an arc-shaped guiding inclined surface, the small end of the self-sealing membrane 5 with a conical structure faces the catheter 7, and the large end of the self-sealing membrane 5 with a conical structure faces the distal outer tube 3, and the infusion cavity 8 of the distal outer tube 3 is connected to the mounting hole 4, and the catheter 7 and the hole wall of the mounting hole 4 will be larger. The impact force separates the catheter 7 by a small distance, so that a certain small gap is generated between the catheter 7 and the hole wall of the mounting hole 4 in the radial direction, that is, a small gap is generated under the large pressure of the liquid medicine in the infusion cavity 8, and the liquid medicine enters the gap to impact the arc-shaped guiding slope of the self-sealing membrane 5. The arc-shaped guiding slope is originally in an inclined state. When one side of the inclined surface is subjected to the impact force, the degree of inclination will be increased, so that one side of the arc-shaped guiding slope of the self-sealing membrane 5 will further expand toward the axial direction, so as to further wrap and tighten 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 elastic film, when facing the impact of the drug solution, the arc-shaped guiding inclined surface expands toward the axis and is closer to the axis, thereby shortening the distance to the outer peripheral surface of the catheter, further locking the outer peripheral surface of the catheter, so that the catheter is firmly fixed in the installation hole. Moreover, since the self-sealing film is a thin elastic diaphragm, its rigidity is lower than that of the catheter, so it will not squeeze the catheter to cause deformation of the catheter, but only plays a role in further locking the catheter, so that even when the drug solution has a large pressure, or the medical staff uses a large force, or the drug solution in the infusion set has a large impact force, or a large delivery pressure suddenly occurs, the catheter will not be deformed, further enhancing the locking and stabilization capabilities of the catheter.

[0050] In addition, in another embodiment, the self-sealing membrane 5 can be distributed at intervals or unequal intervals along the circumferential direction of the mounting hole 4, and each individual self-sealing membrane 5 in the multiple self-sealing membranes 5 annularly surrounding the circumference of the mounting hole 4 can have a fan-shaped structure, and the self-sealing membrane 5 with a fan-shaped structure has an arc-shaped guiding slope on the side facing the distal outer tube 3.

[0051] In addition, in another embodiment, the self-sealing film 5 can be connected in the mounting hole 4 in a spiral shape 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, and the inner diameter of the insertion interface is smaller than the inner diameter of the catheter 7. Therefore, when in use, after the catheter 7 enters the mounting hole 4 of the elastic member 2 from the insertion port, the end of the catheter 7 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 7 in the mounting hole 4 to be connected 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 an inner tube end and an inner tube connecting end connected to each other; the inner tube end has a trumpet-shaped opening; the inner tube connecting end is used to connect to the distal outer tube 3, and a sealed inner cavity for sealing the elastic member 2 is formed between the inner tube connecting end and the distal outer tube 3, one side of the sealed inner cavity is connected to the trumpet-shaped opening, and the other side is connected to the infusion cavity 8, and the infusion cavity 8 has a connecting port 11 corresponding to the mounting hole 4 on the side facing the inner tube connecting end, and the inner diameter of the connecting port 11 is smaller than the inner diameter of the catheter 7, so that the catheter 7 can be inserted into the mounting hole 4 from the trumpet-shaped opening side and abut against the outer periphery of the connecting port 11.

[0060] The purpose of the trumpet-shaped opening at the end of the inner tube is to facilitate the medical staff to manually insert the catheter 7 into the installation hole 4, so that there is sufficient space to accommodate the hand at the insertion port, because the trumpet-shaped opening has a larger outer opening that is conducive to hand movement. Moreover, the trumpet-shaped opening makes the inner wall of the inner tube end have an arc-shaped guiding surface. Even if the catheter 7 entering the trumpet-shaped opening is not located at the axial center of the installation hole 4, it can be smoothly inserted into the installation hole 4 under the guidance of the arc-shaped guiding surface; the inner tube connection end and the distal outer tube The purpose of forming a sealed inner cavity between 3 is to completely wrap the end of the elastic member 2, and the distal outer tube 3 can seal the end of the inner tube connection end, so that the elastic member 2 is firmly fixed in the sealed inner cavity; since the mounting hole 4 needs to be connected with the trumpet-shaped opening, it is convenient for the catheter 7 to enter the mounting hole 4 from the trumpet-shaped opening; the mounting hole 4 also needs to be connected with the infusion cavity 8, so a connecting port 11 corresponding to the mounting hole 4 is provided on the distal outer tube 3, so as to facilitate the liquid in the infusion cavity 8 to flow from the infusion cavity 8 through the connecting port 11 into the mounting hole 4.

[0061] As a preferred embodiment, the infusion cavity 8 is in a cone shape, 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 away from the proximal inner tube 1; the small end of the infusion cavity 8 is provided with a connecting port 11 connected to the catheter 7.

[0062] The conical infusion cavity 8 can fasten infusion sets of different radial sizes, because 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, so the infusion set inserted into the infusion cavity 8 from the side of the distal outer tube 3 is clamped by the radial inner wall that is reduced as it moves into the infusion cavity 8, thereby increasing the size range of the infusion set assembled with the infusion cavity 8 and improving the adaptability of the entire self-locking catheter connector. The conical infusion cavity 8 allows the infusion cavity 8 to have an end with a smaller inner diameter and an end with a larger inner diameter, wherein the end with a smaller inner diameter serves as the small end of the infusion cavity 8, and the end with a larger inner diameter serves as the large end of the infusion cavity 8, with one side of the small end close to the catheter 7 and one side of the large end facing the outer side of the distal outer tube 3, so a connecting port 11 is opened on one side of the small end to connect the infusion cavity 8 with the mounting hole 4, and the liquid medicine in the infusion cavity 8 enters the catheter 7 in the mounting hole 4 from the connecting 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; or, the proximal inner tube 1 and the distal outer tube 3 are detachably connected.

[0064] In the present application, the proximal inner tube 1 and the distal outer tube 3 are connected to form an integrated structure, and the elastic member 2 is 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, so that the elastic member 2 will not be compressed and deformed between the proximal inner tube 1 and the distal outer tube 3, so that the catheter 7 is immediately installed in place when it has entered the installation hole 4 of the elastic member 2 and is inserted into the end position, and there will be no flattening deformation or blockage of the catheter 7 caused by 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, so that the proximal inner tube 1 and the distal outer tube 3 can be removed and replaced separately, and the elastic member 2 is located in the installation inner cavity of the proximal inner tube 1, and the other end of the elastic member 2 along the axial direction is sealed by the distal outer tube 3, so that the elastic member 2 is sealed in the sealed inner cavity formed by the proximal inner tube 1 and the distal outer tube 3.

[0066] The structure of the distal outer tube 3 is not limited to the contents listed in this application. In this application, the structure of the distal outer tube 3 can adopt any of the following implementations:

[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 outer side of the proximal inner tube 1 .

[0068] like 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 connected 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 in 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 in an open structure, the proximal inner tube 1 can be further fixed to enhance 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 in 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 a 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, thereby ensuring the positioning position of the elastic member 2 in the installation inner cavity in the proximal inner tube 1, and ensuring the positioning and locking of the catheter 7.

[0069] Furthermore, the above-mentioned detachable connection between the extension end 9 and the proximal inner tube 1 includes, but is not limited to, a threaded connection, a snap connection, or a connection in which a slot and a buckle cooperate. For example, when a threaded connection is adopted, an internal thread may be provided inside the extension end 9, and an external thread may be provided on the outer periphery of the proximal inner tube 1, and the extension end 9 may be sleeved and connected to the outer side of the proximal inner tube 1 through threaded cooperation.

[0070] Furthermore, the above-mentioned method of fixedly connecting the extension end 9 to the proximal inner tube 1 includes welding the extension end 9 to the outer periphery of the proximal inner tube 1, thereby wrapping at least a partial area of ​​the outer periphery of the proximal inner tube 1 and enhancing the connection strength of the catheter 7 joint connection part.

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

[0072] like Figure 2 As shown, the distal outer tube 3 includes a fixed end 10, and the fixed end 10 can be detachably connected 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, so that a sealed inner cavity for fastening the 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 along the axial direction can be abutted and connected 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] Among them, when the above-mentioned fixed end 10 is detachably connected to the proximal inner tube 1, the fixed end 10 can be connected by a buckle and a slot so that the fixed end 10 is fixedly connected to the end of the proximal inner tube 1; or it can be connected between the fixed end 10 and the proximal inner tube 1 by a clamp so that the fixed end 10 and the proximal inner tube 1 form a detachable connection.

[0074] 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 connected by welding to form an integrated structure.

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

[0076] The manually operated operating position of the proximal inner tube 1 and the distal outer tube 3 is achieved by the first lug on the outside of the proximal inner tube 1 and the second lug on the outside 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 it is necessary to install an infusion set in the infusion cavity 8, the second lug can be taken with one hand and the infusion set can be taken with the other hand and inserted into the infusion cavity 8, thereby facilitating manual operation by medical staff and achieving rapid assembly.

[0077] Anything not described in this application can be achieved by adopting or drawing on existing technologies.

[0078] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0079] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A self-locking catheter connector for assembling an anesthesia catheter, characterized in that: include: A proximal inner tube, wherein an elastic member is connected to the proximal inner tube; An elastic member, wherein the elastic member is provided with a mounting hole for inserting a catheter along the axial direction; a self-sealing film for abutting against the outer periphery of the catheter is provided on at least a part of the inner wall of the mounting hole along the axial direction; the self-sealing film is inclined toward the axis from the proximal inner tube side to the distal outer tube side to form an arc-shaped guiding inclined surface; A distal outer tube, the distal outer tube being connected to the outside of the proximal inner tube to seal the elastic member; the distal outer tube having an infusion cavity connected to the mounting hole; When the catheter is connected to the proximal inner tube, as the pressure of the medicine in the infusion cavity increases, a portion of the medicine that has not entered the catheter flows into the gap formed between the mounting hole and the catheter. The arc-shaped guide slope expands toward the axis under the impact force of the medicine to lock the outer periphery of the catheter.

2. A self-locking conduit connector as claimed in claim 1, characterized in that: A plurality of barbs protruding from the wall are connected to the mounting hole along the axial direction, and the barbs are distributed at intervals or non-intervals along the circumference of the mounting hole; the barbs are inclined toward the distal outer tube side to limit the catheter from sliding toward the proximal inner tube side along the axial direction of the mounting hole.

3. A self-locking conduit connector as claimed in claim 1, characterized in that: The proximal inner tube is in a bullet-shaped structure, and has a bullet-shaped installation cavity in the proximal inner tube. The shape of the elastic member matches the shape of the installation cavity, and the installation cavity forms an elastic member installation position for installing the elastic member.

4. A self-locking conduit connector as claimed in claim 3, characterized in that: The proximal inner tube has a thin end and a thick end that are relatively arranged, the thick end is connected to the distal outer tube, one side of the thin end has an insertion port for a catheter corresponding to the mounting hole, and one side of the thick end has an insertion port corresponding to the mounting hole, the inner diameter of the insertion port 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 port.

5. A self-locking conduit connector as claimed in claim 1, characterized in that: The proximal inner tube includes an inner tube end and an inner tube connecting end connected to each other; the inner tube end has a trumpet-shaped opening; the inner tube connecting end is used to connect to the distal outer tube, and a sealed inner cavity for sealing the elastic member is formed between the inner tube connecting end and the distal outer tube, one side of the sealed inner cavity is connected to the trumpet-shaped opening, and the other side is connected to the infusion cavity, and the infusion cavity has a connecting port corresponding to the mounting hole on the side facing the inner tube connecting end, and the inner diameter of the connecting port is smaller than the inner diameter of the catheter, so that the catheter can be inserted into the mounting hole from the trumpet-shaped opening side and abut against the outer periphery of the connecting port.

6. A self-locking conduit connector as claimed in claim 5, characterized in that: The infusion cavity is in the shape of a cone hole, the small end of the infusion cavity is close to the proximal inner tube, and the large end of the infusion cavity is far away from the proximal inner tube; the small end of the infusion cavity is provided with the communication port connected with the catheter.

7. A self-locking conduit connector as claimed in claim 1, characterized in that: 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.

8. A self-locking conduit connector as claimed in claim 7, characterized in that: The distal outer tube includes an extension end and a fixed end, and 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, 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 along the axial direction to form a sealed end of the elastic member, and the infusion cavity is opened in the fixed end.

9. A self-locking conduit connector as claimed in claim 8, characterized in that: When the proximal inner tube and the distal outer tube can form a detachable connection, the extension end can be detachably connected to the outer side of the proximal inner tube; or, the fixed end can be detachably connected to the outer side 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.

10. A self-locking conduit connector as claimed in claim 1, characterized in that: The self-sealing film is an elastic film; the self-sealing film is annularly connected to the inner wall circumference of the installation hole; or, multiple self-sealing films are connected along the inner wall circumference of the installation hole to form an annular structure, and each self-sealing film is an arc-shaped structure.

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