Automatically closed leak-proof connector and syringe

Abstract

The present invention discloses an automatic sealing anti-leakage joint and a syringe, relating to the technical field of medical devices. The automatic sealing anti-leakage joint comprises a support sleeve comprising an outer tube and an inner tube. The inner tube is sleeved within the head end of the outer tube, the aperture of the head end of the inner tube being smaller than the aperture of the tail end thereof, and the end wall of the head end of the inner tube having a liquid outlet. A retractable elastic tube is sleeved within the outer tube, the tail end of the elastic tube abutting and supporting the tail end of the outer tube, and the inner conduit of the elastic tube is connected to the tail end of the inner conduit of the outer tube. The head end of the elastic tube has an infusion port, which is axially slidable and sealingly inserted into the inner tube to open or close the infusion port. A switch is axially slidably disposed between the inner and outer tubes, the tail end of the switch abutting the elastic tube. When the head end of the support sleeve is inserted into a locking joint, the locking joint pushes the switch toward the tail end of the support sleeve, thereby pushing the elastic tube to slide axially. Using the anti-leakage joint, liquid injection effectively prevents leakage of liquid medicine.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and more particularly to an automatic sealing and leak-proof joint. In addition, the present invention also relates to a syringe comprising the automatic sealing and leak-proof joint. Background Art

[0002] Dangerous drugs are drugs that can cause occupational exposure risks or hazards. They have properties such as genotoxicity, carcinogenicity and teratogenicity. They can also refer to drugs that have harmful effects on fertility and can cause serious organ or other toxicity at low doses, such as anti-tumor drugs.

[0003] In hospitals, the three places with higher risk of exposure to hazardous drugs are usually intravenous preparation centers, operating rooms, and wards.

[0004] Specifically, in intravenous preparation centers, ordinary syringes are currently commonly used to prepare dangerous drugs. During this process, drug splashing or leakage is inevitable. During the entire process, anti-tumor drugs are very likely to invade the bodies of medical staff through the skin, digestive tract, and respiratory tract.

[0005] In the operating room, for example, during the operation process of hepatic arterial chemoembolization, in addition to facing the hazards from radiation, due to the requirements of the operation, anti-tumor drugs are often prepared and injected during the interventional surgery. In this process, medical staff inevitably face anti-tumor drug exposure due to volatilization or leakage of anti-tumor drugs.

[0006] In the ward, during the infusion process, a screw-capped syringe is generally used to add medicine through the needle-free dosing port on the infusion device, or a syringe with a needle is used to puncture the injection part on the infusion device to add medicine. When the syringe is separated from the needle-free dosing port or the injection part, drug volatilization or leakage is more likely to occur.

[0007] In summary, how to prevent the leakage of dangerous drugs is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0008] In view of this, an object of the present invention is to provide an automatic sealing anti-leakage joint, which can be used to effectively prevent liquid leakage during liquid injection.

[0009] Another object of the present invention is to provide a syringe comprising the above-mentioned automatic sealing and leak-proof joint.

[0010] In order to achieve the above object, the present invention provides the following technical solutions:

[0011] An automatic sealing and leak-proof joint comprising:

[0012] A support sleeve having an outer tube and an inner tube, wherein the inner tube is sleeved inside the head end of the outer tube, the aperture of the head end of the inner tube is smaller than the aperture of the tail end of the inner tube, and the end wall of the head end of the inner tube has a liquid outlet;

[0013] An elastic tube having a telescopic structure and being sleeved within the outer tube, with the tail end of the elastic tube abutting and supporting the tail end of the outer tube, and the inner conduit of the elastic tube communicating with the tail end of the inner conduit of the outer tube; an infusion port being provided at the head end of the elastic tube, the head end of the elastic tube being axially slidable and sealingly inserted within the inner tube to open or close the infusion port;

[0014] The switch member is axially slidably arranged between the inner tube and the outer tube, the tail end of the switch member abuts against the elastic tube, and when the head end of the support sleeve is plugged into the locking joint, the locking joint can push the switch member to move toward the tail end of the support sleeve, thereby pushing the elastic tube to slide axially.

[0015] Preferably, the outer tube includes a first support tube and a second support tube;

[0016] The first support tube comprises a first outer tube and the inner tube, the inner tube being sleeved inside the head end of the first outer tube; the second support tube comprises a second outer tube and a second inner tube, the second inner tube being sleeved inside the head end of the second outer tube, the tail end of the elastic tube being sleeved inside the head end of the second inner tube, the outer circumferential surface of the tail end of the second inner tube having a positive thread so as to be threadedly connected to the tail end of the second support tube when the external device is rotated in the positive direction around the axial direction;

[0017] The head end of the second outer tube is inserted into the tail end of the first outer tube to form the outer tube, and the inner circumferential surface of the outer tube of the second outer tube and the first outer tube has a first boss and first clamping portions arranged at intervals along its own circumference, and the first clamping portion is located on a side of the first boss close to the tail end of the outer tube; the outer circumferential surface of the inner tube has a second clamping portion and third clamping portions arranged at intervals along its own circumference, the second clamping portion is close to the head end of the outer tube, and the third clamping portion is close to the tail end of the outer tube;

[0018] When the second support tube slides axially to the first position, the second clamping portion abuts against the first end surface of the first boss close to the first outer tube head end;

[0019] When the second support tube slides axially to the second position, the second clamping portion is away from the first end face of the first boss, and a plurality of the third clamping portions are inserted between the corresponding adjacent first clamping portions, and the third clamping portions abut against the second end face of the first boss close to the tail end of the first outer tube to limit the positive rotation of the second support tube around the axis and the positive sliding axially toward the head end of the first outer tube.

[0020] Preferably, the head end of the second outer tube is inserted into the tail end of the first outer tube, and the outer circumferential surface of the second outer tube has the second clamping portion, the third clamping portion and the second boss, and the second boss is located on a side of the third clamping portion close to the tail end of the second support tube;

[0021] When the second support tube slides axially to the second position, several of the third clamping parts are inserted between the corresponding adjacent first clamping parts, and the third clamping parts abut against the second end face of the first boss, and the first clamping parts abut against the third end face of the second boss close to the second outer tube head end.

[0022] Preferably, the first boss is an annular boss extending along the circumference of the first outer tube, and the second boss is an annular boss extending along the circumference of the second outer tube.

[0023] Preferably, the tail end of the elastic tube is inserted between the second outer tube and the second inner tube, the middle tube section of the elastic tube is a telescopic hose section, the head end of the second inner tube extends into the tapered tube section of the head end of the elastic tube, and the inner pipe of the inner tube is a tapered channel, and the tapered tube section can be inserted into the interior of the inner tube slidably along the axial direction;

[0024] The infusion port includes a first infusion port and a second infusion port, wherein the first infusion port is located on the end wall of the tapered tube section, and the second infusion port is located on the circumferential surface of the tapered tube section. When the tapered tube section slides inside the inner tube, the first infusion port can be opened by loss of pressure or closed by pressure, and the second infusion port can be closed by being blocked by the inner tube or opened by being exposed, so as to connect or isolate the inner pipeline of the inner tube and the inner pipeline of the elastic tube.

[0025] Preferably, the first supporting tube includes a first connecting tube and a second connecting tube, the first connecting tube having a third outer tube and the inner tube, the head end of the second connecting tube being plugged into the tail end of the third outer tube to form the first outer tube, and the second connecting tube having the first boss and the first clamping portion;

[0026] Among the tail end of the third outer tube and the head end of the second connecting tube, the inner circumference of the one located on the outer side has a positioning groove, and the outer circumference of the one located on the inner side has a positioning protrusion, and the positioning protrusion is clamped in the positioning groove to limit the relative position relationship between the first connecting tube and the second connecting tube.

[0027] Preferably, the first clamping portion and the third clamping portion are both right-angled trapezoidal protrusions;

[0028] When the second support tube slides along the first outer tube to the second position, the first plane of the first clamping portion abuts against the third end surface of the second boss, and the second plane of the third clamping portion abuts against the second end surface of the first boss, so as to limit the positive sliding of the second support tube along the axial direction toward the head end of the first outer tube;

[0029] When the second support tube is rotated in the forward direction, the first vertical surface of the first clamping portion can be in contact with the second vertical surface of the third clamping portion to limit the forward rotation of the second support tube around the axis;

[0030] When the second support tube is rotated in the reverse direction, the first inclined surface of the first clamping portion can be slidably attached to the second inclined surface of the third clamping portion, so as to guide the second support tube to slide in the reverse direction toward the tail end of the first outer tube in the axial direction so as to withdraw from the first outer tube.

[0031] Preferably, the inner wall of the head end of the outer tube has an internal thread to cooperate with the inner locking joint thread;

[0032] The head end of the switch element extends to the pipe section of the outer pipe having the internal thread.

[0033] Preferably, the switch member has a positioning ring and at least two guide portions, a plurality of the guide portions are mounted on the same side of the positioning ring, and the guide portions extend in the axial direction;

[0034] The positioning ring is sleeved and clamped on the elastic tube;

[0035] The connecting frame between the inner tube and the outer tube has a plug-in through hole, and several of the plug-in through holes are arranged around the axis. Several guide parts can be slidably plugged into the corresponding plug-in through holes, and the free end of the guide part extends to the head end side of the outer tube.

[0036] A syringe comprises the automatic sealing and leak-proof connector described in any one of the above items.

[0037] The automatic sealing and leak-proof joint provided by the present invention has a double-layer supporting sleeve, in which the inner tube is sleeved inside the head end of the outer tube, the inner diameter of the head end of the inner tube is smaller than the inner diameter of the tail end of the inner tube, and the end wall of the head end of the inner tube is provided with a circular or square through hole as a liquid outlet.

[0038] Correspondingly, the elastic tube is sleeved inside the outer tube, and the tail end of the elastic tube is supported on the tail end of the outer tube, so that the tail end of the elastic tube cannot be separated from the tail end of the outer tube, and the head end of the elastic tube can be extended and retracted with the tail end of the outer tube as a fulcrum. The inner pipe of the elastic tube is connected to the tail end of the inner pipe of the outer tube through its tail end opening, so that the liquid injected into the inner pipe of the outer tube can flow into the inner pipe of the elastic tube.

[0039] The head end of the elastic tube is inserted into the interior of the inner tube. Since the inner diameter of the head end of the inner tube is smaller than the inner diameter of the tail end of the inner tube, when the head end of the elastic tube moves along the inner tube toward the head end, the head end of the elastic tube is compressed and deformed or blocked by the inner tube to close the infusion port, so that the medicine in the elastic tube cannot flow into the inner channel of the inner tube. When the head end of the elastic tube moves along the inner tube toward the tail end, the head end of the elastic tube loses pressure and deforms or is exposed in the inner cavity of the inner tube to open the infusion port, so that the medicine in the elastic tube can flow into the inner channel of the inner tube and be discharged through the liquid outlet provided at the end wall of the head end of the inner tube. In addition, the outer wall of the middle sealing section of the elastic tube is interference-fitted with the inner wall surface of the inner tube to form a seal, so that the medicine flowing into the inner tube will not penetrate into the space between the outer tube and the elastic tube through the space between the head end of the elastic tube and the inner tube.

[0040] The locking joint is inserted into the outer tube, and the switch member is pushed toward the tail end of the supporting sleeve during the insertion of the locking joint into the outer tube, so as to push the head end of the elastic tube toward the tail end of the supporting sleeve, so as to connect the inner pipe of the elastic tube and the inner pipe of the inner tube through the infusion port, so that the medicine can flow through the tail end of the inner pipe of the outer tube, the inner pipe of the elastic tube, the infusion port, the inner pipe of the inner tube and the liquid outlet in sequence, so as to complete the medicine injection. Conversely, after the locking joint is pulled out of the leak-proof joint, the switch member and the elastic tube exert external force on them, so that under the action of the tension of the elastic tube itself, the head end of the elastic tube moves toward the head end of the supporting sleeve pipe, so that the infusion port is closed, thereby effectively preventing the medicine from leaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0042] Figure 1 A cross-sectional view of a specific embodiment provided by the present invention;

[0043] Figure 2A schematic structural diagram of a first connecting pipe according to a specific embodiment of the present invention;

[0044] Figure 3 A schematic structural diagram of the first connecting pipe according to a specific embodiment of the present invention from another angle;

[0045] Figure 4 This is a structural schematic diagram of the first connecting pipe from another angle according to a specific embodiment of the present invention;

[0046] Figure 5 A cross-sectional view of a first connecting pipe according to a specific embodiment of the present invention;

[0047] Figure 6 A schematic structural diagram of a switch element according to a specific embodiment of the present invention;

[0048] Figure 7 A schematic structural diagram of an elastic tube according to a specific embodiment of the present invention;

[0049] Figure 8 A cross-sectional view of an elastic tube according to a specific embodiment of the present invention;

[0050] Figure 9 A schematic structural diagram of a second connecting pipe according to a specific embodiment of the present invention;

[0051] Figure 10 A schematic structural diagram of the second connecting pipe from another angle according to a specific embodiment of the present invention;

[0052] Figure 11 A cross-sectional view of a second connecting pipe according to a specific embodiment of the present invention;

[0053] Figure 12 A schematic structural diagram of a second support tube according to a specific embodiment of the present invention;

[0054] Figure 13 A cross-sectional view of a second support tube according to a specific embodiment of the present invention;

[0055] Figure 14 This is a schematic structural diagram of another second support tube according to a specific embodiment of the present invention.

[0056] Reference numerals:

[0057] 1-Support casing;

[0058] 11- first support tube;

[0059] 111 - first connecting tube; 1111 - third outer tube; 11111 - positioning groove; 11112 - internal thread; 1112 - inner tube; 11121 - liquid outlet; 1113 - plug-in through hole;

[0060] 112 - second connecting pipe; 1121 - first boss; 11211 - first end surface; 11212 - second end surface; 1122 - first clamping portion; 11221 - first plane; 11222 - first vertical surface; 11223 - first inclined surface; 1123 - positioning protrusion;

[0061] 12 - second support tube; 121 - second outer tube; 1211 - second clamping portion; 1212 - third clamping portion; 12121 - second plane; 12122 - second vertical plane; 12123 - second inclined plane; 1213 - second boss; 12131 - third end surface; 1214 - normal-screw thread; 1215 - connecting tapered tube section; 122 - second inner tube;

[0062] 2-elastic tube; 21-conical tube section; 211-first infusion port; 212-second infusion port; 213-annular sealing protrusion; 214-annular groove; 22-telescopic hose section; 23-reinforcement rib;

[0063] 3- switch member; 31- positioning ring; 32- guide portion. DETAILED DESCRIPTION

[0064] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0065] The core of the present invention is to provide an automatic sealing anti-leakage connector, which can effectively prevent liquid leakage during injection. Another core of the present invention is to provide a syringe including the automatic sealing anti-leakage connector.

[0066] Please refer to Figure 1 The present invention provides an automatic sealing and leak-proof joint, comprising a supporting sleeve 1, an elastic tube 2 and a switch member 3.

[0067] Among them, the support sleeve 1 has an outer tube and an inner tube 1112, and the inner tube 1112 is sleeved inside the head end of the outer tube, the aperture of the head end of the inner tube 1112 is smaller than the aperture of the tail end of the inner tube 1112, and the end wall of the head end of the inner tube 1112 has a liquid outlet 11121; the elastic tube 2 is a telescopic structure and is sleeved inside the outer tube, the tail end of the elastic tube 2 is supported by the tail end of the outer tube, and the inner pipe of the elastic tube 2 is connected to the tail end of the inner pipe of the outer tube; the elastic tube 2 is a telescopic structure and is sleeved inside the outer tube, the tail end of the elastic tube 2 is supported by the tail end of the outer tube, and the inner pipe of the elastic tube 2 is connected to the tail end of the inner pipe of the outer tube; The head end of the tube 2 has an infusion port, and the head end of the elastic tube 2 can be axially slidable and sealed inside the inner tube 1112 to open or close the infusion port; the switch member 3 is axially slidable between the inner tube 1112 and the outer tube, and the tail end of the switch member 3 abuts against the elastic tube 2. When the head end of the support sleeve 1 is inserted into the locking joint, the locking joint can push the switch member 3 to move toward the tail end of the support sleeve 1, thereby pushing the elastic tube 2 to slide axially.

[0068] like Figure 1 As shown, the support sleeve 1 is a double-layer sleeve, in which the inner tube 1112 is sleeved inside the upper end of the outer tube, the inner diameter of the upper end of the inner tube 1112 is smaller than the inner diameter of the lower end of the inner tube 1112, and the end wall of the upper end of the inner tube 1112 is provided with a circular or square through hole as a liquid outlet 11121.

[0069] It should be noted that the type of the support sleeve 1 is not limited, as long as a double-layer sleeve is used, for example, the outer tube is a cylindrical tube and the inner tube 1112 is a hexagonal pyramid tube, or the outer tube is a hexagonal prism tube and the inner tube 1112 is a conical tube, etc. The outer tube and the inner tube 1112 can be connected as a whole through a circular ring structure or several rod-like structures.

[0070] In coordination, the elastic tube 2 is sleeved inside the outer tube, and the lower end of the elastic tube 2 is supported by the lower end of the outer tube, so that the lower end of the elastic tube 2 cannot be separated from the lower end of the outer tube, and the upper end of the elastic tube 2 can be extended and retracted with the lower end of the outer tube as a fulcrum. The inner conduit of the elastic tube 2 is connected to the inner conduit of the lower end of the outer tube through its lower end opening, so that the liquid injected into the inner conduit of the outer tube can flow into the inner conduit of the elastic tube 2.

[0071] The upper end of the elastic tube 2 is provided with an infusion port in a rectangular or fusiform shape, and the upper end of the elastic tube 2 is inserted into the inner tube 1112. Since the inner diameter of the upper end of the inner tube 1112 is smaller than the inner diameter of the lower end of the inner tube 1112, when the upper end of the elastic tube 2 extends along the inner tube 1112 toward its upper end, the upper end of the elastic tube 2 is compressed and deformed or blocked by the inner tube 1112 to close the infusion port, so that the liquid medicine in the elastic tube 2 cannot flow into the inner channel of the inner tube 1112. When the upper end of the elastic tube 2 moves along the inner tube 1112 toward its lower end, the upper end of the elastic tube 2 loses pressure and deforms or is exposed in the inner cavity of the inner tube 1112 to open the infusion port, so that the medicinal liquid in the elastic tube 2 can flow into the inner channel of the inner tube 1112 and be output through the liquid outlet 11121 opened on the end wall of the upper end of the inner tube 1112, and the outer wall of the middle sealing tube section of the elastic tube 2 is interference-fitted with the inner wall surface of the inner tube 1112 to form a seal, for example Figure 7 The annular sealing protrusion 213 shown in the figure can be sealed and connected to the structure on the elastic tube 2 by bonding or injection molding, and the infusion port is located above the above-mentioned sealed tube section, so that the liquid medicine flowing into the inner tube 1112 will not penetrate between the outer tube and the elastic tube through the gap between the upper end of the elastic tube 2 and the inner tube 1112.

[0072] It should be noted that the type and shape of the elastic tube 2 are not limited, as long as it is a telescopic structure whose upper end can be deformed under pressure and can recover when the pressure is lost. For example, the elastic tube 2 can be a plastic tube or a rubber tube, and the lower end of the elastic tube 2 is a hexagonal prism tube section and the upper end is a conical tube, or the upper end is a hexagonal pyramid tube section and the lower end is a cylindrical tube section; it should also be noted that the matching relationship between the lower end of the elastic tube 2 and the lower end of the outer tube is not limited, as long as the lower end of the elastic tube 2 can be abutted and supported on the lower end of the outer tube and the inner pipe of the elastic tube 2 is connected to the lower end of the inner pipe of the outer tube. For example, the lower end of the inner tube 1112 has a boss, the lower end of the elastic tube 2 abuts the above-mentioned boss, and has an interference fit with the inner wall of the inner tube 1112.

[0073] A switch member 3 is provided between the upper end of the outer tube and the inner tube 1112 , and the upper end of the switch member 3 extends toward the upper end of the outer tube, and the lower end extends toward the lower end of the support sleeve 1 and abuts against the elastic tube 2 .

[0074] It should be noted that the type of switch member 3 and the manner in which the switch member 3 and the support sleeve 1 are slidably matched are not limited. For example, in some specific embodiments, the switch member 3 is an integrally formed part, such as a plastic part or a carbon fiber part, and has a connecting part and a sliding part. The connecting part adopts an annular structure, and the sliding part is located at the periphery of the connecting part and extends axially. The free end of the sliding part can be deflected toward the center of the sliding part to shrink when under pressure, and the free end of the sliding part can be deflected away from the center of the sliding part to reset when pressure is lost, and the outer side walls of several sliding parts have a convex structure, and correspondingly, the inner wall of the outer tube is provided with a slide groove extending along the length direction of the support sleeve 1, and the convex structures on several sliding parts are inserted into the corresponding slide grooves and slidably matched therewith.

[0075] It should also be noted that the type of the lower end of the support sleeve 1 is not limited, as long as it can be connected to the external device so as to be able to input the liquid medicine into the inner pipe of the support sleeve 1, for example, Figure 14 As shown, the lower end of the support sleeve 1 is a connecting cone pipe section 1215, which can be plugged into the pipeline of external equipment when in use.

[0076] During use, when the leak-proof joint is plugged into the locking joint, during the process of inserting the locking joint into the outer tube, the switch member 3 is pushed toward the lower end of the supporting sleeve 1, so as to push the upper end of the elastic tube 2 toward the lower end of the supporting sleeve 1, so as to connect the inner pipe of the elastic tube 2 and the inner pipe of the inner tube 1112 through the infusion port, so that the medical liquid can flow through the inner pipe of the lower end of the outer tube, the inner pipe of the elastic tube 2, the infusion port, the inner pipe of the inner tube 1112 and the liquid outlet 11121 in sequence, so as to complete the drug injection. Conversely, after the locking joint is pulled out from the leak-proof joint, the switch member 3 and the elastic tube 2 exert external force thereon, so that under the action of the tension of the elastic tube 2 itself, the upper end of the elastic tube 2 moves toward the upper end of the supporting sleeve 1, so that the infusion port is closed, thereby effectively preventing the leakage of the medical liquid.

[0077] On the basis of the above embodiment, the outer tube includes a first support tube 11 and a second support tube 12; the first support tube 11 has a first outer tube and an inner tube 1112, the inner tube 1112 is sleeved inside the head end of the first outer tube, and the second support tube 12 has a second outer tube 121 and a second inner tube 122, the second inner tube 122 is sleeved inside the head end of the second outer tube 121, the tail end of the elastic tube 2 is sleeved on the head end of the second inner tube 122, and the outer circumferential surface of the tail end of the second inner tube 122 has a positive thread 1214, so that the tail end of the second support tube 12 can be threadedly connected when the external device is rotated in the positive direction around the axial direction; the head end of the second outer tube 121 is inserted into the tail end of the first outer tube to form an outer tube, and the inner circumferential surface of the outer one of the second outer tube 121 and the first outer tube has a first boss 1121 and first clamping portions 1122 arranged at intervals along its own circumference, and the first clamping portion 1122 is located near the outer end of the first boss 1121 One side of the tail end of the tube; the outer circumferential surface of the one located on the inner side has a second clamping portion 1211 and third clamping portions 1212 arranged at intervals along its own circumference, the second clamping portion 1211 is close to the head end of the outer tube, and the third clamping portion 1212 is close to the tail end of the outer tube; when the second support tube 12 slides axially to the first position, the second clamping portion 1211 abuts against the first end face 11211 of the first boss 1121 close to the head end of the first outer tube; when the second support tube 12 slides axially to the second position, the second clamping portion 1211 is away from the first end face 11211 of the first boss 1121, and several third clamping portions 1212 are inserted between the corresponding adjacent first clamping portions 1122, and the third clamping portion 1212 abuts against the second end face 11212 of the first boss 1121 close to the tail end of the first outer tube, so as to limit the positive rotation of the second support tube 12 around the axis and the positive sliding axially toward the head end of the first outer tube.

[0078] like Figure 1 As shown, the first support tube 11 is a double-layer sleeve, in which the inner tube 1112 is sleeved inside the upper end of the first outer tube, and the upper end of the second support tube 12 is inserted into the lower end of the first outer tube. The second support tube 12 is also a double-layer sleeve, in which the second inner tube 122 is sleeved inside the second outer tube 121, and the second inner tube 122 is inserted inside the first outer tube. The upper end of the second outer tube 121 is plugged into the lower end of the first outer tube to form a complete tubular outer tube.

[0079] In order to limit the second support tube 12 and restrict the positive rotation of the second support tube 12 relative to the first support tube 11, refer to Figures 1 to 14In the shown position, in the pipe section where the first outer tube and the second outer tube 121 are plugged together, the inner circumference of the outer one has a first boss 1121 and a first clamping portion 1122, and the first boss 1121 is located above the first clamping portion 1122, and the outer circumference of the inner one has a second clamping portion 1211 and a third clamping portion 1212, and the third clamping portion 1212 is located above the second clamping portion 1211. In the process of plugging the second support tube 12 and the first support tube 11 into one body, the second clamping portion 1211 is compressed and deformed so as to be able to pass through the pipe section where the first boss 1121 is located, and after passing through the pipe section where the first boss 1121 is located, the pressure is lost and recovered so as to be able to During the circumferential sliding process, the second support tube 12 abuts against or moves away from the first end face 11211 of the first boss 1121, and several second clamping portions 1211 can be inserted into or withdrawn between the corresponding adjacent third clamping portions 1212. When the second clamping portions 1211 abut against the first boss 1121, the second support tube 12 can be restricted from withdrawing from the first support tube 11. When several second clamping portions 1211 are inserted between the corresponding adjacent third clamping portions 1212, and the third clamping portions 1212 abut against the second end face 11212 of the first boss 1121, the second support tube 12 can be restricted from being inserted further deeply and can be restricted from sliding forward.

[0080] Correspondingly, the lower end of the second support tube 12 has a positive thread 1214, so that when the lower end of the leak-proof joint is threadedly connected to the external device, the upper end of the external device is abutted against the lower end of the leak-proof joint, and an upward axial force is applied to push the second support tube 12 to move upward to the second position inside the first support tube 11, and then the external device is rotated forward. During this process, the first clamping portion 1122 cooperates with the third clamping portion 1212, so that the second support tube 12 cannot rotate forward relative to the first support tube 11, so that the external device can be tightened with the lower end of the second support tube 12. After tightening, the upward axial force is removed, and under the action of the rebound force of the elastic tube 2, the second support tube 12 is pushed to move downward to the first position inside the first support tube 11, as shown in FIG. Figure 1 As shown, at this time, the second support tube 12 can be rotated in the forward or reverse direction relative to the first support tube 11 to effectively prevent the leak-proof joint from being screwed off from the external device.

[0081] Optionally, in some specific embodiments, such as Figure 10 As shown, the inner circumference of the lower end of the first outer tube has a first boss 1121 and a first clamping portion 1122. The first boss 1121 is a ring-shaped or arc-shaped boss structure extending along the circumference of the first outer tube. Two or three first clamping portions 1122 are arranged at intervals along the circumference of the first outer tube, and the first clamping portions 1122 are located below the first boss 1121. Figures 12 to 14As shown, the outer circumferential surface of the upper end of the second outer tube 121 is provided with a second boss 1213, a second clamping portion 1211 and a third clamping portion 1212. The second boss 1213 is a ring-shaped or arc-shaped boss structure extending along the circumference of the second outer tube 121. Two or three equal numbers of third clamping portions 1212 are arranged at intervals along the circumference, and the third clamping portion 1212 is located above the second clamping portion 1211.

[0082] During assembly, the upper end of the second outer tube 121 is inserted upward into the interior of the first outer tube, so that the second clamping portion 1211 is compressed and deformed to pass through the tube section of the first outer tube where the first boss 1121 is located, and is inserted into the tube section of the first outer tube located above the first boss 1121, and the second support tube 12 can slide axially in the first outer tube. When in use, when the second support tube 12 slides downward to the first position, as shown in FIG. Figure 1 As shown, the second clamping portion 1211 abuts against the first end face 11211 of the upper end of the first boss 1121, and the second outer tube 121 has a tube section of the third clamping portion 1212 located outside the first outer tube. During the process of the second support tube 12 sliding upward to the second position, the second clamping portion 1211 moves upward away from the first boss 1121, and a number of third clamping portions 1212 are inserted upward between the corresponding adjacent first clamping portions 1122 until the upper end of the third clamping portion 1212 abuts against the second end face 11212 of the lower end of the first boss 1121, thereby restricting the second support tube 12 from continuing to slide upward, and through the cooperation between the third clamping portion 1212 and the first clamping portion 1122, the second support tube 12 is restricted from rotating forward.

[0083] Optionally, in some other specific embodiments, refer to Figures 1 to 14 In the shown orientation, a first boss 1121 and a first clamping portion 1122 are provided on the outer circumferential surface of the lower end of the first outer tube. The first boss 1121 is a boss structure of an annular or arc-shaped type extending along the circumference of the first outer tube. Two or three equal numbers of first clamping portions 1122 are arranged at intervals along the circumference of the first outer tube, and the first clamping portion 1122 is located below the first boss 1121; correspondingly, a second boss 1213, a second clamping portion 1211 and a third clamping portion 1212 are provided on the inner circumferential surface of the upper end of the second outer tube 121. The second boss 1213 is a boss structure of an annular or arc-shaped type extending along the circumference of the second outer tube 121. Two or three equal numbers of third clamping portions 1212 are arranged at intervals along the circumference of the first outer tube, and the third clamping portion 1212 is located above the second clamping portion 1211.

[0084] During assembly, the lower end of the first outer tube is inserted downwardly into the interior of the second outer tube 121, so that the second clamping portion 1211 is compressed and deformed to pass through the tube section of the second outer tube 121 where the first boss 1121 is located, and is inserted into the tube section of the second outer tube 121 located below the first boss 1121, and the second support tube 12 can slide axially along the outside of the first outer tube. When in use, when the second support tube 12 slides downward to the first position, the second clamping portion 1211 abuts against the first end surface 11211 of the lower end of the first boss 1121, and the tube section of the first outer tube having the third clamping portion 1212 Located outside the second outer tube 121, while the second support tube 12 slides upward to the second position, the first boss 1121 moves upward away from the second clamping portion 1211, and several first clamping portions 1122 are inserted upward between the corresponding adjacent third clamping portions 1212 until the lower end of the third clamping portion 1212 abuts against the second end surface 11212 of the upper end of the first boss 1121, thereby restricting the second support tube 12 from continuing to slide upward, and through the cooperation between the third clamping portion 1212 and the first clamping portion 1122, the second support tube 12 is restricted from rotating in the forward direction.

[0085] It should be noted that the types of the first clamping portion 1122 and the third clamping portion 1212 are not limited, as long as they can cooperate with each other to limit the positive rotation of the second support tube 12. For example, a rectangular structure can be used, or Figures 9 to 11 As shown, a right-angled trapezoidal structure can also be adopted, and the first clamping portion 1122 and the second clamping portion 1211 can be the same or different; it should also be noted that the number and distribution of the first clamping portion 1122 and the third clamping portion 1212 are not limited. For example, optionally, the number of the first clamping portions 1122 is twice the number of the third clamping portions 1212, and in each first clamping portion 1122 arranged around the center line of the first outer tube, two first clamping portions 1122 form a group, and each group of first clamping portions 1122 is arranged at intervals around the center line of the first outer tube, and the two first clamping portions 1122 in the same group are arranged to abut each other, so that each third clamping portion 1212 can be inserted between two adjacent groups of first clamping portions 1122, or, preferably, as Figures 9 to 14 As shown, the number of the first clamping parts 1122 is equal to the number of the third clamping parts 1212, and the first clamping parts 1122 are evenly arranged around the center line of the first outer tube, and the third clamping parts 1212 are evenly arranged around the center line of the second support tube 12. With this arrangement, the structure of the leak-proof joint is simple and easy to produce.

[0086] It should also be noted that the type of the second clamping portion 1211 is not limited, as long as it can pass through the first boss 1121 and engage with its upper end. For example, the second clamping portion 1211 is an elastic sealing ring extending in the circumferential direction, and the elastic sealing ring is bonded to the outer circumferential surface of the corresponding first outer tube or the second outer tube 121, or, preferably, as Figures 12 to 14 As shown, the second clamping portion 1211 is arranged on the outer circumferential surface of the corresponding first outer tube or the second outer tube 121 through a tensioning piece, and a plurality of tensioning pieces are arranged at intervals around the center axis, and the free end of the tensioning piece can be deflected toward or away from the center axis, and the second clamping portion 1211 is located on the outer surface of the free end of the tensioning piece, so that when the first support tube 11 and the second support tube 12 are plugged and assembled, under the action of the tensioning piece contracting when the second clamping portion 1211 is compressed, the pipe section with the second clamping portion 1211 on the inner side can pass through the pipe section where the first boss 1121 is located, and under the action of the tensioning piece opening when the second clamping portion 1211 loses pressure, the second clamping portion 1211 can abut against the first end face 11211 of the first boss 1121 during the sliding process of the second tube sleeve.

[0087] On the basis of the above embodiment, the head end of the second outer tube 121 is inserted into the tail end of the first outer tube, and the outer peripheral surface of the second outer tube 121 has a second clamping portion 1211, a third clamping portion 1212 and a second boss 1213, and the second boss 1213 is located on the side of the third clamping portion 1212 close to the tail end of the second support tube 12; when the second support tube 12 slides axially to the second position, a plurality of third clamping portions 1212 are inserted between the corresponding adjacent first clamping portions 1122, and the third clamping portion 1212 abuts against the second end face 11212 of the first boss 1121, and the first clamping portion 1122 abuts against the third end face 12131 of the second boss 1213 close to the head end of the second outer tube 121.

[0088] like Figures 12 to 14 As shown, the outer circumferential surface of the second outer tube 121 is provided with a second clamping portion 1211, a third clamping portion 1212 and a second boss 1213, and the second clamping portion 1211, the third clamping portion 1212 and the second boss 1213 are arranged from top to bottom, so that the second support tube 12 can be inserted into the interior of the first support tube 11, and after pushing the second support tube 12 upward to the second position, the lower end of the first clamping portion 1122 abuts against the third end face 12131 of the upper end of the second boss 1213, and the upper end of the third clamping portion 1212 abuts against the second end face 11212 of the lower end of the first boss 1121. With such an arrangement, the manufacturing difficulty of the leak-proof joint is relatively low.

[0089] It should be noted that the types of the first boss 1121 and the second boss 1213 are not limited as long as the above functions can be achieved. For example, in some specific embodiments, the first boss 1121 and the second boss 1213 are both arc-shaped bosses extending along the circumferential direction, and the two ends of several first bosses 1121 abut against the corresponding adjacent first clamping portions 1122, and the two ends of several second bosses 1213 abut against the corresponding adjacent third clamping portions 1212; or, preferably, in other specific embodiments, the first boss 1121 and the second boss 1213 are both annular bosses extending along the circumferential direction.

[0090] On the basis of the above embodiment, the tail end of the elastic tube 2 is inserted between the second outer tube 121 and the second inner tube 122, the middle tube section of the elastic tube 2 is a telescopic hose section 22, the head end of the second inner tube 122 extends into the tapered tube section 21 at the head end of the elastic tube 2, and the inner pipe of the inner tube 1112 is a tapered channel, and the tapered tube section 21 can be inserted into the inner tube 1112 slidably along the axial direction; the infusion port includes a first infusion port 211 and a second infusion port 212, the first infusion port 211 is located on the end wall of the tapered tube section 21, and the second infusion port 212 is located on the circumferential surface of the tapered tube section 21, and when the tapered tube section 21 slides inside the inner tube 1112, the first infusion port 211 can be opened by decompression or closed by pressure, and the second infusion port 212 can be blocked and closed by the inner tube 1112 or exposed and opened, so as to connect or isolate the inner pipe of the inner tube 1112 and the inner pipe of the elastic tube 2.

[0091] like Figure 1 As shown, the lower end of the elastic tube 2 is inserted between the second outer tube 121 and the second inner tube 122 of the second support tube 12, as shown in FIG. Figure 7 and Figure 8 As shown, the upper end of the elastic tube 2 is a tapered tube section 21, and the diameter of the upper end of the tapered tube section is smaller than the diameter of the lower end. Correspondingly, the inner pipe of the inner tube 1112 is a tapered channel. Such a setting is conducive to improving the smoothness of the axial movement of the second support tube 12.

[0092] Furthermore, a first infusion port 211 of rectangular or spindle-shaped shape is provided on the end wall of the upper end of the tapered tube section 21, and / or a second infusion port 212 of square or circular shape is provided on the circumference of the tapered tube section 21. When in use, after the upper end of the elastic tube 2 extends upward along the inner tube 1112, the circumference of the upper end of the elastic tube 2 is tightly fitted with the inner tube 1112, so that the second infusion port 212 is blocked and closed by the inner wall of the inner tube 1112, and the end wall of the upper end of the tapered tube section 21 is blocked by the inner tube 1112. The first infusion port 211 is closed by squeezing and deformation, so that the drug liquid cannot flow from the elastic tube 2 into the inner tube 1112. After the upper end of the elastic tube 2 retracts downward along the inner tube 1112, a gap is left between the peripheral wall of the upper end of the elastic tube 2 and the inner wall of the inner tube 1112, thereby opening the second infusion port 212. The end wall of the upper end of the tapered tube section 21 loses pressure and returns to its original shape, thereby opening the first infusion port 211. The drug liquid can then flow into the inner tube 1112, that is, it can be discharged through the liquid outlet 11121.

[0093] Furthermore, the middle tube section of the elastic tube 2 is a telescopic flexible hose section 22. The telescopic flexible hose section 22 can adopt a structure with a serrated or wavy longitudinal cross-section of the peripheral wall so as to be able to expand and contract along the axial direction, thereby increasing the expansion and contraction margin of the elastic tube 2.

[0094] Furthermore, Figure 7As shown, a reinforcing rib 23 is provided on the telescopic hose section 22 , and the reinforcing rib 23 extends along the circumferential direction, thereby effectively enhancing the telescopic ability of the elastic tube 2 .

[0095] It should be noted that the type and number of the reinforcing ribs 23 are not limited as long as the above functions can be achieved. For example, the reinforcing ribs 23 can be made of elastic fiber strips or elastic nylon strips, and several reinforcing ribs 23 can be evenly arranged around the axis, or only one reinforcing rib 23 can be set.

[0096] On the basis of the above embodiment, the first support tube 11 includes a first connecting tube 111 and a second connecting tube 112, the first connecting tube 111 has a third outer tube 1111 and an inner tube 1112, the head end of the second connecting tube 112 is inserted into the tail end of the third outer tube 1111 to form a first outer tube, and the second connecting tube 112 has a first boss 1121 and a first clamping portion 1122; of the tail end of the third outer tube 1111 and the head end of the second connecting tube 112, the inner circumference of the outer one has a positioning groove 11111, and the outer circumference of the inner one has a positioning protrusion 1123, and the positioning protrusion 1123 is clamped in the positioning groove 11111 to limit the relative position relationship between the first connecting tube 111 and the second connecting tube 112.

[0097] like Figure 1 As shown, the first support tube 11 is composed of a first connecting tube 111 and a second connecting tube 112 that are plugged together. Figures 1 to 5 As shown, the first connecting tube 111 is a double-layer sleeve, the inner tube 1112 in the first connecting tube 111 is sleeved inside the head end of the third outer tube 1111 in the first connecting tube 111, and the lower end of the third outer tube 1111 is plugged into the upper end of the second connecting tube 112 to form a first outer tube, and the lower end of the second connecting tube 112 is provided with a first boss 1121 and a first clamping portion 1122 to cooperate with the second clamping portion 1211, the third clamping portion 1212 and the second boss 1213 on the second support tube 12, then the third outer tube 1111 of the first connecting tube 111, the second connecting tube 112 and the outer tubes of the second support tube 12 are sequentially plugged in from top to bottom to form an outer tube.

[0098] In order to prevent the second connecting tube 112 from axially moving or circumferentially rotating relative to the first connecting tube 111, in the axial section where the upper end of the second connecting tube 112 and the lower end of the first connecting tube 111 are plugged in, the outer circumferential surface of the inner one has a positioning protrusion 1123, and the inner circumferential surface of the outer one has a positioning groove 11111, so that after the two are plugged in, the positioning protrusion 1123 and the positioning groove 11111 can be matched to limit the relative movement of the two.

[0099] Optionally, in some specific embodiments, such as Figure 4 and 5As shown, a positioning groove 11111 is provided on the inner circumference of the lower end of the third outer tube 1111, which is matched with the inner circumference of the third outer tube 1111. Figure 9 and Figure 10 As shown, the outer peripheral surface of the upper end of the second connecting pipe 112 has a positioning protrusion 1123, or, optionally, in other specific embodiments, refer to Figures 1 to 14 In the shown position, a positioning protrusion 1123 is provided on the outer circumference of the lower end of the third outer tube 1111 , and a positioning groove 11111 is provided on the inner circumference of the upper end of the second connecting tube 112 .

[0100] It should be noted that the number and type of the positioning protrusions 1123 and the positioning grooves 11111 are not limited, as long as they can prevent the first support tube 11 and the second connecting tube 112 from moving relative to each other. For example, in some specific embodiments, referring to Figures 1 to 14 In the orientation shown, the inner circumference of the lower end of the third outer tube 1111 has a concave stop as a positioning groove 11111, and the outer circumference of the upper end of the second connecting tube 112 has a convex stop as a positioning protrusion 1123, so that the first connecting tube 111 and the second connecting tube 112 can be snap-fitted, or, preferably, in other specific embodiments, as Figure 4 and Figure 5 As shown, the inner circumference of the lower end of the third outer tube 1111 has a long strip positioning groove 11111 extending in the axial direction and an annular positioning groove 11111 extending in the circumferential direction. The plurality of long strip positioning grooves 11111 are evenly arranged in the circumferential direction. Figure 9 and Figure 10 As shown, the outer peripheral surface of the upper end of the second connecting tube 112 has an elongated positioning protrusion 1123 extending axially and an annular positioning protrusion 1123 extending circumferentially, a plurality of elongated positioning protrusions 1123 are evenly arranged circumferentially, a plurality of elongated positioning protrusions 1123 are inserted into corresponding elongated positioning grooves 11111, and the annular positioning protrusion 1123 is clamped in the annular positioning groove 11111.

[0101] On the basis of the above embodiment, the first clamping portion 1122 and the third clamping portion 1212 are both right-angled trapezoidal protrusions; when the second support tube 12 slides along the first outer tube to the second position, the first flat surface 11221 of the first clamping portion 1122 abuts against the third end surface 12131 of the second boss 1213, and the second flat surface 12121 of the third clamping portion 1212 abuts against the second end surface 11212 of the first boss 1121, thereby limiting the positive sliding of the second support tube 12 in the axial direction toward the head end of the first outer tube; When the second support tube 12 is rotated forward, the first vertical surface 11222 of the first clamping portion 1122 can be attached to the second vertical surface 12122 of the third clamping portion 1212 to limit the forward rotation of the second support tube 12 around the axis; when the second support tube 12 is rotated backward, the first inclined surface 11223 of the first clamping portion 1122 can be slidably attached to the second inclined surface 12123 of the third clamping portion 1212, which is used to guide the second support tube 12 to slide in the opposite direction along the axial direction toward the tail end of the first outer tube so as to exit the first outer tube.

[0102] Optionally, in some specific embodiments, the second support tube 12 has a third clamping portion 1212, and the first support tube 11 has a first clamping portion 1122, such as Figure 10 and Figure 11 As shown, the first clamping portion 1122 is a right-angled trapezoidal protrusion. Figure 12 and Figure 14 As shown, the third clamping portion 1212 is a right-angled trapezoidal protrusion. After the upper end of the second support tube 12 is inserted into the first support tube 11 to the second position along the circumferential direction, the first plane 11221 of the first clamping portion 1122 is parallel to the second plane 12121 of the third clamping portion 1212, the first vertical surface 11222 of the same first clamping portion 1122 is opposite to the second vertical surface 12122 of the adjacent second clamping portion 1211, and the first inclined surface 11223 is opposite to the second inclined surface 12123 of the other adjacent second clamping portion 1211. In this way, when the second support tube 12 is rotated forward, the first vertical surface 11221 of the first clamping portion 1122 is parallel to the second plane 12121 of the third clamping portion 1212. 22 abuts against and fits with the second vertical surface 12122 of the second clamping portion 1211 adjacent to itself. When the second support tube 12 is rotated in the opposite direction, the first inclined surface 11223 of the first clamping portion 1122 abuts against and fits with the second inclined surface 12123 of the second clamping portion 1211 adjacent to itself. Therefore, in the process of rotating the second support tube 12 in the opposite direction, the third clamping portion 1212 of the second support tube 12 slides along the first inclined surface 11223 of the first clamping portion 1122 of the first support tube 11. Therefore, the second support tube 12 can withdraw from the first support tube 11 under the guidance of the first clamping portion 1122, so as to further effectively prevent the leak-proof joint from being screwed off from the external equipment.

[0103] Optionally, in other specific embodiments, the second support tube 12 has a first clamping portion 1122 with a right-angled trapezoidal protrusion, and the first support tube 11 has a third clamping portion 1212 with a right-angled trapezoidal protrusion. The principle is the same as that of the above-mentioned embodiment in which the second support tube 12 has a third clamping portion 1212 with a right-angled trapezoidal protrusion and the first support tube 11 has a first clamping portion 1122 with a right-angled trapezoidal protrusion, so it will not be elaborated here.

[0104] Based on the above embodiment, the inner wall of the head end of the outer tube has an internal thread 11112 to cooperate with the inner locking joint thread; and the head end of the switch member 3 extends to the pipe section of the outer tube with the internal thread 11112.

[0105] like Figures 1 to 3 、 Figure 5 As shown, an internal thread 11112 is processed on the inner circumference of the upper end of the outer tube, so that it can be threadedly connected to the inner locking joint with an external thread processed on the outer circumference. Correspondingly, the upper end of the switch member 3 extends to the pipe section where the internal thread 11112 is located. Therefore, when the inner locking joint is inserted into the interior of the outer tube and tightened with the anti-leakage joint, the switch member 3 will be pushed downward in the axial direction to push the upper end of the elastic tube 2 to retract downward in the inner tube 1112, thereby opening the infusion port, so that the drug liquid can flow out through the lower end of the inner tube 1112 section of the outer tube, the inner tube 1112 section of the elastic tube 2, the infusion port and the liquid outlet 11121 in sequence. The anti-leakage joint effectively prevents the drug liquid from leaking when not in use.

[0106] It should be noted that there is no restriction on whether the upper end of the switch member 3 extends beyond the outer tube, as long as the compression requirement of the elastic tube 2 can be met to achieve the above-mentioned function of opening the infusion port. For example, the upper end of the switch member 3 can be retracted into the interior of the outer tube, or the upper end of the switch member 3 can protrude to the outside of the outer tube.

[0107] Based on the above embodiment, the switch member 3 has a positioning ring 31 and at least two guide parts 32, and the multiple guide parts 32 are installed on the same side of the positioning ring 31, and the guide parts 32 extend in the axial direction; the positioning ring 31 is sleeved and clamped on the elastic tube 2; the connecting frame between the inner tube 1112 and the outer tube has a plug-in through hole 1113, and the multiple plug-in through holes 1113 are arranged around the axis, and the multiple guide parts 32 can be slidably plugged into the corresponding plug-in through holes 1113, and the free end of the guide part 32 extends to the side of the head end of the outer tube.

[0108] like Figure 6As shown, the bottom of the switch member 3 is a positioning ring 31, which is sleeved on the outside of the elastic tube 2. It should be noted that the clamping method between the positioning ring 31 and the elastic tube 2 is not limited. For example, a circumferential annular groove 214 is provided on the outer circumference of the elastic tube 2 to clamp the positioning ring 31, or the elastic tube 2 and the positioning ring 31 are interference fit.

[0109] like Figure 1 and Figure 4 As shown, a connecting frame for connecting the outer tube and the inner tube 1112 is provided with an axially extending plug-in hole 1113, and correspondingly, a plurality of guide portions 32 are fixedly connected to the top of the positioning ring 31 and extend axially to be inserted into the corresponding plug-in holes 1113, so that the switch member 3 can be guided to move axially through the plug-in holes 1113, and the position of the switch member 3 is limited by the above-mentioned connection structure so that it cannot withdraw from the top of the outer tube. Such a setting is conducive to ensuring the performance of the anti-leakage joint in preventing liquid leakage.

[0110] It should be noted that the types of the guide portion 32 and the plug-in hole 1113 are not limited, as long as the above functions can be achieved. For example, in some specific embodiments, the guide portion 32 can be a cylindrical rod, and the plug-in hole 1113 can be a round hole, so that the guide portion 32 can be inserted into the plug-in hole 1113 and fit therewith. Alternatively, preferably, in other specific embodiments, Figure 6 As shown, the guide portion 32 can be an arched sheet body, which is matched with the guide portion 32. Figure 4 As shown, the plug-in through hole 1113 can be an arc-shaped hole extending along the circumference of the anti-leakage joint, so that the guide portion 32 can be inserted into the plug-in through hole 1113 and fit therewith in a clearance.

[0111] Preferably, Figures 1 to 14 As shown, the upper end of the second inner tube 122 and the upper end of the second support tube 12 are both conical tube sections with the same shape, such as a conical tube section or a hexagonal pyramid tube section. As a result, from the inside to the outside, the upper end conical tube section 21 of the elastic tube 2, the upper end of the second inner tube 122, and the upper end of the second support tube 12 are sequentially arranged on each other, which is conducive to improving the smoothness of the movement of the upper end of the elastic tube 2 extending upward or retracting downward.

[0112] On the basis of the above embodiment, a protective cap is further included. The head end of the support sleeve 1 can be inserted into or pulled out of the interior of the protective cap. Usually, in the anti-leakage joint, the upper end of the support sleeve 1 is inserted into the interior of the protective cap. The upper end opening of the support sleeve 1 can be sealed by the protective cap to protect the structure arranged inside the support sleeve 1. When the anti-leakage joint needs to be used, the anti-leakage joint can be pulled out of the protective cap.

[0113] In addition to the above-mentioned automatic sealing and anti-leakage joint, the present invention also provides a syringe including the automatic sealing and anti-leakage joint disclosed in the above-mentioned embodiment. For the structures of other parts of the syringe, please refer to the prior art and will not be described in detail herein.

[0114] It should be noted that the relational terms such as "first" and "second" mentioned above are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities; the "upper surface, lower surface, top, bottom" and the directional words "up, down, left, right" mentioned above are all defined based on the drawings in the specification.

[0115] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0116] The above describes in detail the automatic sealing, leak-proof connector and syringe provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above examples is intended only to facilitate understanding of the method and core concepts of the present invention. It should be noted that those skilled in the art will be able to make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. An automatic sealing and leak-proof joint, characterized in that: include: A support sleeve (1) having an outer tube and an inner tube (1112), wherein the inner tube (1112) is sleeved inside the head end of the outer tube, the aperture of the head end of the inner tube (1112) is smaller than the aperture of the tail end of the inner tube (1112), and the end wall of the head end of the inner tube (1112) has a liquid outlet (11121); The elastic tube (2) is a telescopic structure and is sleeved inside the outer tube. The tail end of the elastic tube (2) is supported by the tail end of the outer tube, and the inner pipe of the elastic tube (2) is connected to the tail end of the inner pipe of the outer tube. The head end of the elastic tube (2) has an infusion port. The head end of the elastic tube (2) can be axially slidable and sealed to be inserted into the interior of the inner tube (1112) to open or close the infusion port. The switch member (3) is axially slidably disposed between the inner tube (1112) and the outer tube, the tail end of the switch member (3) abuts against the elastic tube (2), and when the head end of the support sleeve (1) is plugged into the locking connector, the locking connector can push the switch member (3) to move toward the tail end of the support sleeve (1), thereby pushing the elastic tube (2) to slide axially; The outer tube comprises a first support tube (11) and a second support tube (12); The first support tube (11) comprises a first outer tube and an inner tube (1112), the inner tube (1112) being sleeved inside the head end of the first outer tube; the second support tube (12) comprises a second outer tube (121) and a second inner tube (122), the second inner tube (122) being sleeved inside the head end of the second outer tube (121); the tail end of the elastic tube (2) being sleeved on the head end of the second inner tube (122); the outer peripheral surface of the tail end of the second inner tube (122) having a positive thread (1214) for threadedly connecting the tail end of the second support tube (12) when the external device is rotated in the positive direction around the axial direction; The head end of the second outer tube (121) is plugged into the tail end of the first outer tube to form the outer tube, and the inner circumferential surface of the second outer tube (121) and the first outer tube has a first boss (1121) and first clamping portions (1122) arranged at intervals along its own circumference, and the first clamping portion (1122) is located on a side of the first boss (1121) close to the tail end of the outer tube; the outer circumferential surface of the inner outer tube has a second clamping portion (1211) and third clamping portions (1212) arranged at intervals along its own circumference, the second clamping portion (1211) is close to the head end of the outer tube, and the third clamping portion (1212) is close to the tail end of the outer tube; When the second support tube (12) slides axially to a first position, the second clamping portion (1211) abuts against a first end surface (11211) of the first boss (1121) close to the first outer tube head end; When the second support tube (12) slides axially to the second position, the second clamping portion (1211) is away from the first end surface (11211) of the first boss (1121), and a plurality of the third clamping portions (1212) are inserted between corresponding adjacent first clamping portions (1122), and the third clamping portions (1212) abut against the second end surface (11212) of the first boss (1121) close to the tail end of the first outer tube, so as to limit the second support tube (12) from rotating in the positive direction around the axis and sliding in the positive direction axially toward the head end of the first outer tube; The head end of the second outer tube (121) is inserted into the tail end of the first outer tube, and the outer circumferential surface of the second outer tube (121) has the second clamping portion (1211), the third clamping portion (1212) and the second boss (1213), and the second boss (1213) is located on a side of the third clamping portion (1212) close to the tail end of the second support tube (12); When the second support tube (12) slides axially to the second position, a plurality of the third clamping portions (1212) are inserted between corresponding adjacent first clamping portions (1122), and the third clamping portions (1212) abut against the second end surface (11212) of the first boss (1121), and the first clamping portion (1122) abuts against the third end surface (12131) of the second boss (1213) close to the head end of the second outer tube (121); The first clamping portion (1122) and the third clamping portion (1212) are both right-angled trapezoidal protrusions; When the second support tube (12) slides along the first outer tube to the second position, the first plane (11221) of the first clamping portion (1122) abuts against the third end surface (12131) of the second boss (1213), and the second plane (12121) of the third clamping portion (1212) abuts against the second end surface (11212) of the first boss (1121), so as to limit the positive sliding of the second support tube (12) along the axial direction toward the head end of the first outer tube; When the second support tube (12) is rotated in the forward direction, the first vertical surface (11222) of the first clamping portion (1122) can be attached to the second vertical surface (12122) of the third clamping portion (1212) to limit the forward rotation of the second support tube (12) around the axis; When the second support tube (12) is rotated in the reverse direction, the first inclined surface (11223) of the first clamping portion (1122) can be slidably attached to the second inclined surface (12123) of the third clamping portion (1212), and is used to guide the second support tube (12) to slide in the reverse direction toward the tail end of the first outer tube in the axial direction so as to exit from the first outer tube.

2. The automatic sealing and leak-proof joint according to claim 1, characterized in that: The first boss (1121) is an annular boss extending along the circumference of the first outer tube, and the second boss (1213) is an annular boss extending along the circumference of the second outer tube (121).

3. The automatic sealing and leak-proof joint according to claim 1, characterized in that: The tail end of the elastic tube (2) is inserted between the second outer tube (121) and the second inner tube (122); the middle tube section of the elastic tube (2) is a telescopic hose section (22); the head end of the second inner tube (122) extends into the tapered tube section (21) at the head end of the elastic tube (2); the inner tube of the inner tube (1112) is a tapered channel; the tapered tube section (21) can be inserted into the interior of the inner tube (1112) slidably along the axial direction; The infusion port comprises a first infusion port (211) and a second infusion port (212), wherein the first infusion port (211) is located on the end wall of the conical tube section (21), and the second infusion port (212) is located on the circumferential surface of the conical tube section (21). When the conical tube section (21) slides inside the inner tube (1112), the first infusion port (211) can be opened by loss of pressure or closed by pressure, and the second infusion port (212) can be closed by being shielded by the inner tube (1112) or opened by being exposed, so as to connect or block the inner conduit of the inner tube (1112) and the inner conduit of the elastic tube (2).

4. The automatic sealing and leak-proof joint according to claim 1, characterized in that: The first supporting tube (11) comprises a first connecting tube (111) and a second connecting tube (112); the first connecting tube (111) comprises a third outer tube (1111) and the inner tube (1112); the head end of the second connecting tube (112) is plugged into the tail end of the third outer tube (1111) to form the first outer tube; the second connecting tube (112) comprises the first boss (1121) and the first clamping portion (1122); The tail end of the third outer tube (1111) and the head end of the second connecting tube (112) have a positioning groove (11111) on the inner circumference of the outer one, and a positioning protrusion (1123) on the outer circumference of the inner one, and the positioning protrusion (1123) is engaged in the positioning groove (11111) to limit the relative position relationship between the first connecting tube (111) and the second connecting tube (112).

5. The automatic sealing and leak-proof joint according to claim 1, characterized in that: The inner wall of the head end of the outer tube has an internal thread (11112) to cooperate with the thread of the inner locking joint; Furthermore, the head end of the switch member (3) extends to the pipe section of the outer pipe having the internal thread (11112).

6. The automatic sealing and leak-proof joint according to claim 1, characterized in that: The switch member (3) has a positioning ring (31) and at least two guide portions (32), wherein a plurality of the guide portions (32) are mounted on the same side of the positioning ring (31), and the guide portions (32) extend in the axial direction; The positioning ring (31) is sleeved on and clamped to the elastic tube (2); The connection frame between the inner tube (1112) and the outer tube has a plug-in through hole (1113), and a plurality of the plug-in through holes (1113) are arranged around an axis. A plurality of the guide portions (32) can be slidably plugged into the corresponding plug-in through holes (1113), and the free ends of the guide portions (32) extend to one side of the head end of the outer tube.

7. A syringe, characterized in that: The invention comprises the automatic sealing and leak-proof joint according to any one of claims 1 to 6.

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