Safe remaining needle for dialysis

Abstract

The invention discloses a safe remaining needle for dialysis. The safe remaining needle comprises a remaining assembly, a puncture assembly, an anti-backflow device, a flow stopping clamp and an anti-needling device. The indwelling assembly comprises a catheter, a catheter base, an extension tube and an infusion connector. The puncture assembly comprises a puncture needle and a needle base, the rear end of the puncture needle is fixedly connected with the needle base, and the puncture needle penetrates through the interiors of the anti-puncturing device, the anti-backflow device and the indwelling assembly in a sliding mode; the front end of the anti-reflux device is connected with the infusion interface of the indwelling assembly, and the rear end of the anti-reflux device is open and connected with the anti-acupuncture device; the puncture-proof device penetrates through the puncture needle, the front end of the puncture-proof device is matched with an opening in the rear end of the backflow-proof device, and the rear end of the puncture-proof device is matched with the needle seat; after the puncture succeeds, when the puncture needle retreats to the position of the anti-needling device, the needle head is limited in the anti-needling device; and the flow stopping clip is used for temporarily pressing the punctured extension tube. The device is safe and convenient to use, the treatment effect of hemodialysis is guaranteed, and the risk that medical staff are infected with blood spread diseases is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of hemodialysis, and in particular to a safety indwelling needle for hemodialysis. Background Art

[0002] Hemodialysis is one of the renal replacement therapies for patients with acute and chronic renal failure. In traditional hemodialysis treatment, intravenous fistula needles are commonly used. However, there are obvious disadvantages in using intravenous fistula needles to establish vascular access for patients. Due to the high hardness of intravenous fistula needles, they are easy to damage the blood vessel wall, resulting in bleeding and loss of blood from the patient. At the same time, the high hardness of intravenous fistula needles makes it difficult to fix, and needle slippage is prone to cause bleeding, resulting in dialysis interruption and affecting the progress of treatment. In addition, during the hemodialysis process, patients need to undergo up to 4-5 hours of treatment, during which the arm needs to remain still and cannot move at will. Slight movement will increase the risk of the inner wall of the blood vessel being pierced or punctured by the sharp steel needle, causing swelling of the intravenous fistula blood vessels and large-area subcutaneous congestion, increasing the burden on patients. At the same time, maintaining a fixed posture for a long time causes poor patient comfort.

[0003] With the advancement of modern medical technology, dialysis indwelling needles are being widely used. After puncture, the needle can be withdrawn, and what remains in the patient's blood vessels is a soft polymer tube. It will not cause damage to the blood vessels. However, there are also some problems with dialysis indwelling needles.

[0004] 1. Clinically, the dialysis indwelling needle is used for blood vessel puncture and connected to the blood circuit for hemodialysis. The product will have an exhaust component, including an exhaust connector and an exhaust membrane. This component is used to exhaust air after blood vessel puncture, and observe the blood return to help nurses determine the success of the puncture. The special function of the exhaust membrane is that it is breathable and liquid-impermeable. After the puncture is successful, the air will be discharged through the exhaust membrane, and the blood will not leak through the exhaust membrane. In the prior art, this component is a welded structure, and the exhaust membrane and the exhaust connector are welded by a welding machine to prevent the filter membrane from falling off. However, the above products have the following shortcomings: (1) The welding part between the exhaust connector and the exhaust membrane is small in size and difficult to operate and process; (2) The welding process requires the purchase of additional equipment, which is an additional economic burden for small enterprises.

[0005] 2. When medical staff perform puncture, if they directly hold the catheter for puncture, the surface of the catheter is smooth and the medical staff do not have a good point of force, making it inconvenient to apply force.

[0006] 3. When the needle is removed after puncture, medical staff are at risk of being pricked by the needle tip, which may cause a puncture injury at the very least, or even infection at the worst. At the same time, the needle tip is directly exposed to the outside, which increases the risk of medical waste handlers being pricked by the needle tip and infected during subsequent medical waste disposal.

[0007] 4. If there is no appropriate anti-backflow device during puncture and needle withdrawal, blood may overflow. To ensure that blood does not overflow during puncture and needle withdrawal, a blood blocking and isolating device must be used.

[0008] 5. After the needle is pulled out, an anticoagulant needs to be injected, and then the extracorporeal blood circulation tube is connected to start dialysis. In this process, the blood circuit needs to be temporarily blocked. The nurse needs to pinch the middle section of the hose with his hands or with an instrument. If the hose is not pinched tightly, the blood in the blood vessels such as the fistula will spray out, which will cause the loss and waste of part of the patient's blood on the one hand, and blood pollution and increase the risk of hospital infection on the other hand. In addition, if the instrument such as hemostatic forceps clamps the hose part of the middle section of the dialysis indwelling needle too tightly, it will cause the hose to break, and will also cause blood loss and blood contamination of bed sheets, clothing and working environment. The product does not have a switch clip designed to make it difficult to seal the tube with heparin saline on a daily basis, and the sealing is not thorough, which can easily lead to the formation of thrombus in the dialysis indwelling needle and block the dialysis indwelling needle. Some products come with a clip, but the size of the clip needs to increase the length of the product, which affects the puncture observation of medical staff. And the clip is only used at the beginning. If the clip is worn for 4-6 hours during dialysis, it will cause a sense of oppression on the patient and affect comfort. Some products have a sheet frame, which is small in size and does not affect the length design of the product, and can be disassembled. However, the blood flow blocking force is small and cannot completely block the blood flow.

[0009] 6. When fixing the catheter, it is easy to slip and difficult to be fixed because the catheter is cylindrical and has a small contact area with the skin. It is also easy to shift due to the movement of the patient during subsequent treatment, causing discomfort to the patient.

[0010] For this reason, a kind of safety indwelling needle for dialysis is proposed. Summary of the invention

[0011] The purpose of the present invention is to provide a safe indwelling needle for dialysis.

[0012] In order to solve the above technical problems, the present invention adopts the following technical solutions: A safety indwelling needle for dialysis, comprising an indwelling component, a puncture component, an anti-backflow device, a flow-stopping clamp and an anti-needle-puncture device; The indwelling assembly includes a catheter, a catheter hub, an extension tube, and an infusion interface; The puncture assembly includes a puncture needle and a needle seat, the rear end of the puncture needle is fixedly connected to the needle seat, and the puncture needle penetrates and is slidably connected to the interior of the needle puncture prevention device, the backflow prevention device and the retention assembly; The front end of the anti-backflow device is connected to the infusion interface of the indwelling component, and the rear end is open and connected to the anti-needlestick device; there is an anti-backflow pad in the middle of the anti-backflow device; The anti-needle-stick device penetrates the puncture needle, and the front end cooperates with the rear end opening of the anti-backflow device, and the rear end cooperates with the needle seat; when the puncture is successful, when the puncture needle retreats to the position of the anti-needle-stick device, the needle head is confined in the anti-needle-stick device; The stop clamp is used to temporarily compress the extension tube after puncture, and the stop clamp is removed when not in use.

[0013] Furthermore, the catheter is provided with one or more side holes; the front end of the catheter is an inclined surface; and the catheter is made of a soft polymer material.

[0014] Furthermore, a protrusion is provided on the upper side of the catheter seat, and a handle wing is provided on the lower side.

[0015] Furthermore, the front end of the anti-backflow device is a Luer connector, which is connected to the infusion interface of the retention component through the Luer connector; and an anti-slip ring is arranged on the periphery of the anti-backflow device.

[0016] Furthermore, the anti-backflow pad is a product formed of liquid silicone, with a bowl-shaped arc, and cross-distributed cutting edges on both sides of the arc surface, the maximum depth of the cutting edges is 1 / 2 of the wall thickness, and point contact is formed at the intersection to form an openable and closable mouth; In its natural state, the cutting edge is squeezed by the plastic parts on both sides of the anti-backflow pad and is in a closed state; when a puncture needle passes through the cutting edge, the cutting edge is affected by the pressure difference between the inner and outer surfaces and its own shrinkage, which will seal the puncture needle.

[0017] Furthermore, the needle stick prevention device comprises an inner tube and an outer tube, the outer tube is installed at the rear end opening of the anti-backflow device, and the rear end of the outer tube is set as an opening; the inner tube is installed in the outer tube through the opening and slidably cooperates with the outer tube in the front-rear direction; The front ends of the inner tube and the outer tube are fixedly provided with front end sealing plates, and a front end through hole for the puncture needle to pass through is provided at the center of the front end sealing plate; the rear end of the inner tube is fixedly provided with a rear end sealing plate, and a rear end through hole for the puncture needle to pass through is provided on the rear end sealing plate; The front end of the puncture needle is provided with a limiting portion, the outer diameter of the limiting portion is larger than the outer diameter of the puncture needle; the inner diameter of the front through hole is larger than the outer diameter of the limiting portion; the inner diameter of the rear through hole is larger than the outer diameter of the puncture needle and smaller than the outer diameter of the limiting portion; A one-way blocking member is provided in the inner cylinder. The one-way blocking member is an elastic structure integrally composed of a front plate, an upper bending plate and a lower bending plate. The front plate is arranged close to the front end sealing plate of the inner cylinder; the front end of the upper bending plate is connected to the upper side of the front plate, and has an upper protruding portion protruding downward in the middle, and an upper tail tilted upward at the rear end; the front end of the lower bending plate is connected to the lower side of the front plate, and has a lower protruding portion protruding upward in the middle, and has a lower tail tilted downward at the rear end; the upper protruding portion and the lower protruding portion are staggered in the up-down direction and the front-back direction; Upper clamping grooves are provided at the upper sides of the inner tube and the outer tube and at the positions corresponding to the upper tails, and lower clamping grooves are provided at the lower sides of the inner tube and the outer tube and at the positions corresponding to the lower tails.

[0018] Furthermore, the needle stick prevention device comprises a front tube and a rear tube, the front tube is installed at the rear end opening of the backflow prevention device; the rear end of the front tube and the front end of the rear tube are respectively set as openings, and the two are plug-connected to form a sliding fit in the front-to-back direction; A front end sealing plate is fixedly provided at the front end of the front cylinder, and a front end through hole for the puncture needle to pass through is provided at the center of the front end sealing plate; a rear end sealing plate is fixedly provided at the rear end of the rear cylinder, and a rear end through hole for the puncture needle to pass through is provided on the rear end sealing plate; The front end of the puncture needle is provided with a limiting portion, the outer diameter of the limiting portion is larger than the outer diameter of the puncture needle; the inner diameter of the front through hole is larger than the outer diameter of the limiting portion; the inner diameter of the rear through hole is larger than the outer diameter of the puncture needle and smaller than the outer diameter of the limiting portion; A one-way blocking member is provided in the space enclosed by the front cylinder and the rear cylinder. The one-way blocking member is an elastic structure composed of a lower plate, a middle bending plate and a vertical plate. The lower plate is installed on the rear cylinder. The middle of the middle bending plate has a bending portion protruding forward. The lower end of the middle bending plate is connected to the lower plate, and the upper end of the middle bending plate is connected to the upper end of the vertical plate. The lower end of the vertical plate extends downward and slides through the lower plate. An avoidance groove is provided on the front cylinder or the rear cylinder at a position corresponding to the vertical plate.

[0019] Furthermore, the needle stick prevention device includes a limiting cylinder and a guide cylinder. The limiting cylinder is installed at the rear end opening of the anti-backflow device, and a perforation is provided at the rear end of the limiting cylinder. The front end of the guide cylinder is set as an opening and is fixed correspondingly to the rear end perforation of the limiting cylinder. A front end sealing plate is fixedly provided at the front end of the limiting cylinder, and a front end through hole for the puncture needle to pass through is provided at the center of the front end sealing plate; a rear end sealing plate is fixedly provided at the rear end of the guide cylinder, and a rear end through hole for the puncture needle to pass through is provided on the rear end sealing plate; The front end of the puncture needle is provided with a limiting portion, the outer diameter of the limiting portion is larger than the outer diameter of the puncture needle; the inner diameter of the front through hole is larger than the outer diameter of the limiting portion; the inner diameter of the rear through hole is larger than the outer diameter of the puncture needle and smaller than the outer diameter of the limiting portion; the inner diameter of the rear end through hole of the limiting cylinder and the front end opening of the guide cylinder are larger than the outer diameter of the limiting portion; A one-way blocking member is provided in the limiting cylinder, and the one-way blocking member includes a sliding seat that slides with the limiting cylinder in the up and down directions, a stopper pointing to the puncture needle is fixed on the lower side of the sliding seat, and an elastic mechanism is provided between the upper side of the sliding seat and the limiting cylinder.

[0020] Furthermore, the flow stop clamp includes two clamp bodies arranged opposite to each other, and clamping parts are provided at the opposite surfaces of the two clamp bodies. The clamping parts are elongated, and a long clamping groove is provided on the side of the clamping part facing the extension tube. The bottom surface of the clamping groove is a plane, forming a surface contact with the extension tube.

[0021] Furthermore, the needle seat is convexly arranged, and an exhaust device is fixedly connected to the rear end of the needle seat. The exhaust device consists of an exhaust joint and a filter plug. The filter plug is air-permeable and liquid-impermeable as a whole, and is interference-assembled in the hollow position of the exhaust joint.

[0022] Beneficial effects of the present invention: 1. Compared with ordinary dialysis indwelling needles, the dialysis safety indwelling needle of the present invention is provided with an anti-needlestick device. When the puncture is successful, when the needle tube retracts to the position of the anti-needlestick device, the needle head is confined in the anti-needlestick device, and the needle tip is shielded and not exposed to the outside world, thereby preventing the needle tip from stabbing medical staff or patients, thus ensuring the safety of medical staff and patients. At the same time, in the subsequent process of medical waste treatment, it can also prevent the needle tip from stabbing staff, thereby reducing the risk of medical staff being infected with blood-borne diseases.

[0023] 2. The present invention enhances the convenience of using the dialysis safety indwelling needle through the design of a stop clamp. When in use, the stop clamp can be used to open and block the blood path. When injecting anticoagulants and connecting the extracorporeal blood circulation path, the nurse needs to pinch the middle section of the hose by hand or use an instrument to clamp the middle section of the hose, so as to avoid the blood in the blood vessels such as internal fistulas being sprayed out if the hose is not pinched tightly, which on the one hand causes the loss and waste of part of the patient's blood, and on the other hand causes blood contamination and increased risk of hospital infection. In addition, if an instrument such as a hemostatic forceps clamps the middle section of the hose of the dialysis indwelling needle too tightly, it will cause damage to the hose, and will also cause blood loss and blood contamination of bed sheets and the working environment.

[0024] 3. The anti-backflow device designed in the present invention is mainly aimed at the problem that the existing dialysis indwelling needle has the risk of blood leakage during puncture and connection, and ensures that blood does not leak during puncture and connection.

[0025] 4. The present invention makes the catheter of the indwelling component into a soft polymer material, which has less stimulation to the patient's blood vessel wall and avoids damage to the inner wall of the blood vessel, thereby reducing the incidence of blood vessel swelling and bleeding, and prolonging the service life of the patient's arteriovenous fistula. The indwelling tube material has better biocompatibility than steel needles, and the incidence of patient allergies is lower. The patient can also move relatively freely. The movement of the patient's body during dialysis will not cause sudden changes in blood flow, and there is no need to worry about the needle puncturing the blood vessel, thereby increasing the patient's comfort.

[0026] 5. The design of the catheter seat of the present invention allows medical staff to hold the wing handle and the protrusion on the catheter seat and insert the metal puncture needle into the patient's blood vessel for puncture, so that the medical staff has a better point of force, which is convenient for the medical staff to perform the puncture operation. At the same time, the wing handle increases the contact area between the indwelling needle and the patient's skin, reduces the pressure on the skin, and improves the comfort. In addition, after the puncture is completed, it is convenient for the medical staff to fix the indwelling needle, preventing the indwelling needle from being broken due to the movement of the patient during the subsequent dialysis treatment, affecting the flow rate during hemodialysis, and avoiding affecting the treatment effect of hemodialysis; 6. In the present invention, the exhaust joint and the filter plug are fixed by interference assembly, which is easy to operate and process, and eliminates the welding process and does not require the purchase of additional equipment. For small enterprises, it can save part of the expenses, thereby reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an overall schematic diagram of the present invention; Figure 2 It is a schematic diagram of the retention component in the present invention; Figure 3 is a cross-sectional view of a retention component in the present invention; Figure 4 is a schematic diagram of the puncture assembly and the exhaust device in the present invention; Figure 5 is a cross-sectional view of the puncture assembly and the exhaust device in the present invention; Figure 6 is a schematic diagram of the backflow prevention device in the present invention; Figure 7 is a cross-sectional view of the backflow prevention device in the present invention; Figure 8 is a schematic diagram of a flow stop clamp in the present invention; Fig. 9 Schematic diagram of the relationship between the puncture needle and the needle-stick prevention device when the needle is not withdrawn in the first embodiment; Fig.10 for Fig. 9 A magnified view of the needle stick protection device in the middle; Fig.11 Schematic diagram of the relationship between the puncture needle and the needle-stick protection device when the needle is withdrawn in Example 1; Fig.12 for Fig.11 sectional view of Fig.13 This is a schematic diagram of the installation of the puncture needle in Example 1; Fig.14 Schematic diagram of the relationship between the puncture needle and the needle-stick prevention device when the needle is not withdrawn in the second embodiment; Fig.15 for Fig.14 A magnified view of the needle stick protection device in the middle; Fig.16 Schematic diagram of the relationship between the puncture needle and the needle-stick prevention device when the needle is withdrawn in the second embodiment; Fig.17 for Fig.15 sectional view of Fig.18 Schematic diagram of the relationship between the puncture needle and the needle-stick prevention device when the needle is not withdrawn in the third embodiment; Fig.19 for Fig.18 A magnified view of the needle stick protection device in the middle; Fig. 20 Schematic diagram of the relationship between the puncture needle and the needle-stick prevention device when the needle is withdrawn in Example 3; Fig.21 for Fig. 20 Cross-sectional view of .

[0028] The drawings are only used for illustrative purposes and should not be construed as limitations on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0030] Embodiment 1: like Figures 1 to 13 As shown, this embodiment provides a safety indwelling needle for dialysis, including an indwelling component 1, a puncture component 2, an anti-backflow device 3, a flow stop clamp 4, an anti-needlestick device 5 and an exhaust device 6.

[0031] The indwelling assembly 1 includes a catheter 11, a catheter seat 12, an extension tube 13 and an infusion interface 14. The front end of the catheter 11 is an inclined surface, which is convenient for puncture and reduces damage. The catheter 11 contains one to four side holes, which prevent the catheter 11 from sticking to the wall of the blood vessel and affecting dialysis while improving the blood flow. The catheter 11 is tightly combined with the extension tube 13 and integrally injection molded with the catheter seat 12 to avoid coagulation during dialysis due to the dead angle of the inner cavity. The catheter 11 is set to a soft polymer material to avoid damage to the inner wall of the blood vessel, reduce the incidence of vascular swelling and bleeding, and extend the service life of the patient's arteriovenous fistula. The indwelling tube material is better than the steel needle biocompatibility, the patient's allergy incidence is lower, and the patient can also move relatively freely. The movement of the patient's body during dialysis will not cause a sudden change in blood flow, and there is no need to worry about the needle puncturing the blood vessel, which increases the patient's comfort. A developing material can also be added to the polymer material so that the catheter 11 has a developing function.

[0032] The catheter seat 12 is provided with a protrusion on the upper side and a handle wing on the lower side, which provides a support point for medical staff during the puncture process, assists in vascular puncture and fixes the indwelling needle with a protective cover to avoid sliding and puncturing the packaging bag during transportation. The handle wing design increases the contact area with the skin, making it easier to be fixed, and also avoids the patient's discomfort caused by displacement due to the patient's movement during subsequent treatment.

[0033] The puncture assembly includes a puncture needle 21 and a needle seat 22. The rear end of the puncture needle 21 is fixedly connected to the needle seat 22, and the puncture needle 21 penetrates and is slidably connected to the inside of the needle puncture prevention device 5, the anti-backflow device 3 and the retention assembly 1. The puncture needle 21 is a hollow steel needle, and a limiting portion 23 is provided at the front end of the puncture needle 21, which cooperates with the needle puncture prevention device 5 to prevent the needle tip from being exposed.

[0034] The needle holder 22 has an anti-needle puncture device 5 at the front end and an exhaust device 6 fixedly connected at the rear end. The end of the needle holder 22 close to the exhaust device can be used to observe blood return. The needle holder 22 has a convex surface design and a magnifying function, which is convenient for observing blood return. The needle holder 22 has an enlarged gap between the puncture needle 21 and the exhaust device 6, which is also convenient for observing blood return.

[0035] The exhaust device 6 is composed of an exhaust connector 61 and a filter plug 62. The filter plug 62 is gas-permeable and liquid-impermeable as a whole, and is interference-assembled in the hollow position of the exhaust connector 61, which is safe and reliable, and has a simple process. The exhaust device 6 has a certain taper and cooperates with the needle seat 22.

[0036] The anti-backflow device 3 ensures that blood does not leak out during puncture and connection. One end of the anti-backflow device 3 is connected to the retention component 1, and the other end is connected to the anti-needle puncture device 5. The end of the anti-backflow device 3 connected to the infusion interface 14 on the retention component 1 is a Luer connector, and the end connected to the anti-needle puncture device 5 is open, with a liquid silicone anti-backflow pad 31 in the middle. Anti-slip rings are arranged at intervals along the outer periphery of the anti-backflow device to facilitate the separation of the anti-backflow device from the needle seat.

[0037] The backflow prevention pad is a liquid silicone molded product with a cross valve, a bowl-shaped arc, and a cross-distributed cutting edge on both sides of the arc. The maximum depth of the cutting edge is 1 / 2 of the wall thickness, forming a point contact at the intersection. In the natural state, the cutting edge is squeezed by the plastic parts on both sides of the silicone and is in a closed state. When an instrument passes through the cutting edge from the arc of the surface to complete the delivery of the instrument or liquid, the cutting edge is affected by the pressure difference between the inner and outer surfaces and its own shrinkage, and it will play a sealing role. In this way, the functional requirements of the silicone product are met and the sealing is continuously maintained.

[0038] The stopper clip 4 temporarily compresses the extension tube after puncture. When the stopper clip contacts the extension tube, a certain blocking force is ensured to achieve the blood blocking effect, but the blocking force is not too large to damage the extension tube. When not in use, the stopper clip 4 is directly removed, which will not compress the extension tube, and can be used repeatedly, which is convenient to use.

[0039] In order to achieve a large and uniform contact area between the stopper clamp and the extension tube 13, the stopper clamp 4 in this embodiment is configured as follows: the stopper clamp 4 includes two clamp bodies 41 disposed opposite to each other, and the two clamp bodies 41 provide clamping force through an elastic band 44 of the outer jacket. A clamping portion 42 is provided at the opposite surfaces of the two clamp bodies 41, and the clamping portion is in a long strip shape, and a long clamping groove 43 is provided on the side of the clamping portion 42 facing the extension tube, and the bottom surface of the clamping groove 43 is a plane, forming a surface contact fit with the extension tube 13.

[0040] The design of the stop clamp 4 enhances the convenience of using the dialysis safety catheter. The stop clamp can be used to open and block the blood circuit during use. When injecting anticoagulants and connecting the extracorporeal blood circulation circuit, the nurse needs to pinch the middle section of the hose by hand or use an instrument to clamp the middle section of the hose to avoid the blood in the internal fistula and other blood vessels from spurting out if the hose is not pinched tightly. On the one hand, it causes the loss and waste of part of the patient's blood, and on the other hand, it pollutes the blood and increases the risk of hospital infection. In addition, if an instrument such as a hemostatic forceps clamps the middle section of the hose of the dialysis catheter too tightly, it will cause damage to the hose, and will also cause blood loss and blood contamination of bed sheets and working environment.

[0041] The anti-needle puncture device 5 penetrates the puncture needle 21, and the front end cooperates with the rear end opening of the anti-backflow device 3, and the rear end cooperates with the needle seat 22. When the puncture is successful, when the puncture needle 21 retreats to the position of the anti-needle puncture device 5, the needle head is confined in the anti-needle puncture device 5, and the needle tip is shielded and not exposed to the outside world, preventing the needle tip from stabbing medical staff or patients, ensuring the safety of medical staff and patients, and at the same time, in the subsequent process of medical waste treatment, it can also prevent the needle tip from stabbing staff, reducing the risk of medical staff contracting blood-borne diseases.

[0042] like Figures 9 to 13 As shown, the structure of the needle stick prevention device 5 in this embodiment is as follows: The anti-needlestick device 5 includes an outer tube 51 and an inner tube 52. The outer tube 51 is fixedly installed at the rear end opening of the anti-backflow device 3, and the rear end of the outer tube 51 is set as an opening; the inner tube 52 is installed in the outer tube 51 through the opening and slides with it in the front-to-back direction.

[0043] The front ends of the inner tube 52 and the outer tube 51 are fixedly provided with front end sealing plates, and a front end through hole 53 for the puncture needle to pass through is provided at the center position of the front end sealing plate; the rear end of the inner tube 52 is fixedly provided with a rear end sealing plate 54, and the rear end sealing plate 54 is provided with a rear end through hole 55 for the puncture needle to pass through.

[0044] A limiting portion 23 is provided at the front end of the puncture needle 21, and the outer diameter of the limiting portion 23 is larger than the outer diameter of the puncture needle 21; the inner diameter of the front through hole 53 is larger than the outer diameter of the limiting portion 53; the inner diameter of the rear through hole 55 is larger than the outer diameter of the puncture needle 21 and smaller than the outer diameter of the limiting portion 23.

[0045] A one-way blocking member is provided in the inner cylinder 22. The one-way blocking member is an elastic structure composed of a front plate 56, an upper bending plate 57 and a lower bending plate 58. The material can be a thin steel plate with elasticity. The front plate 56 is arranged near the front end sealing plate of the inner cylinder; the front end of the upper bending plate 57 is connected to the upper side of the front plate, and has an upper protruding portion protruding downward in the middle, and an upper tail tilted upward at the rear end; the front end of the lower bending plate 58 is connected to the lower side of the front plate 56, and has a lower protruding portion protruding upward in the middle, and has a lower tail tilted downward at the rear end. The upper protruding portion and the lower protruding portion are arranged in a staggered manner in the up-down direction and the front-back direction.

[0046] Upper clamping grooves are provided at the upper sides of the inner tube 52 and the outer tube 51 and at the corresponding positions of the upper tail, and lower clamping grooves are provided at the lower sides of the inner tube 52 and the outer tube 51 and at the corresponding positions of the lower tail.

[0047] The working principle of the needle stick prevention device 5 in this embodiment is as follows: When assembling, Fig.13 As shown, a certain portion of the front end of the puncture needle 21 is first flattened by a special tool, and the flattened portion forms an elliptical structure, while the other needle tube portions of the puncture needle 21 remain in a circular structure, so that the diameter of the flattened portion is larger than the diameter of the other needle tubes, forming a stopper 23. Afterwards, the puncture needle 21 is inserted backward from front to back, and the rear end of the puncture needle 21 passes through the anti-backflow device 3 and the anti-needle puncture device 5 in sequence and is connected to the needle seat 22.

[0048] When the rear end of the puncture needle 21 passes through the anti-backflow device 3, the rear end of the puncture needle 21 first passes through the front through hole 53, and then enters the one-way blocking member, and the upper bending plate 57 and the lower bending plate 58 are stretched apart. After the upper bending plate 57 and the lower bending plate 58 are stretched apart, they will be clamped on the puncture needle 21, and then the rear end of the puncture needle will pass through the rear through hole 55. And when the upper bending plate 57 and the lower bending plate 58 are stretched apart, the upper tail of the upper bending plate 57 will move and get stuck in the upper clamping groove, and the lower tail of the lower bending plate 58 will move and get stuck in the lower clamping groove, thereby limiting the inner cylinder 52 from moving backward relative to the outer cylinder 51. In this way, the assembly is completed.

[0049] After the puncture is successful, the puncture needle 21 retreats to the position of the needle-puncture prevention device 5, and the puncture needle 21 leaves the upper bending plate 57 and the lower bending plate 58, and the upper bending plate 57 and the lower bending plate 58 return to their original shapes. Since the upper protrusion and the lower protrusion are arranged in a staggered manner in the up-down direction and the front-back direction, the needle head cannot pass through the one-way blocking member forward; since the inner diameter of the rear end through hole 55 is larger than the outer diameter of the puncture needle 21 and smaller than the outer diameter of the limiting portion 23, the limiting portion 23 cannot pass through the rear end through hole 55 backward. In this way, the needle head is restricted in the needle-puncture prevention device 5.

[0050] Embodiment 2: The difference between this embodiment and the first embodiment lies in the different structure of the needle stick protection device 5 .

[0051] like Figures 14 to 17 As shown, the structure of the needle stick prevention device 5 in this embodiment is as follows: The needle stick prevention device 5 includes a front tube 71 and a rear tube 72. The front tube 71 is fixedly mounted at the rear end opening of the backflow prevention device 3. The rear end of the front tube 71 and the front end of the rear tube 72 are respectively opened, and the two are plug-connected to form a sliding fit in the front-to-back direction.

[0052] The front end of the rear tube 72 is provided with a plug-in portion, the outer diameter of the plug-in portion is smaller than that of the rear tube, and the two form a step. The outer diameter of the plug-in portion is also matched with the inner diameter of the front tube 71. When the plug-in portion at the front end of the rear tube 72 is inserted into the front tube 71, the rear end of the front tube 71 abuts against the step to achieve sliding limitation in the front-to-back direction.

[0053] A front sealing plate is fixedly provided at the front end of the front cylinder 71, and a front through hole 73 for the puncture needle to pass through is provided at the center of the front sealing plate; a rear sealing plate is fixedly provided at the rear end of the rear cylinder 72, and a rear through hole 74 for the puncture needle to pass through is provided on the rear sealing plate.

[0054] The front end of the puncture needle 21 is provided with a limiting portion 22 , and the inner diameter of the front through hole 73 is larger than the outer diameter of the limiting portion 22 ; the inner diameter of the rear through hole 74 is larger than the outer diameter of the puncture needle 21 and smaller than the outer diameter of the limiting portion 23 .

[0055] A one-way blocking member is provided in the space enclosed by the front tube 71 and the rear tube 72. The one-way blocking member is an elastic structure composed of a lower plate 75, a middle bending plate 76 and a vertical plate 77. The lower plate 75 is installed on the rear tube. The middle of the middle bending plate 76 has a bending portion protruding forward. The lower end of the middle bending plate 76 is connected to the lower plate 75. The upper end of the middle bending plate 76 is connected to the upper end of the vertical plate 77. The lower end of the vertical plate 77 extends downward and slides through the lower plate 75 (two vertical plates 77 are provided in a left-right distribution). In addition, a avoidance groove is provided on the front tube 71 at a position corresponding to the vertical plate 77.

[0056] The working principle of the needle stick prevention device 5 in this embodiment is as follows: The assembly method of the puncture needle 21 is the same as that of the first embodiment.

[0057] When the rear end of the puncture needle 21 passes through the anti-backflow device 3, the rear end of the puncture needle 21 first passes through the front through hole 73, and then enters the one-way blocking member, pressing the middle bending plate 76 downward. The rebound force of the middle bending plate 76 after being pressed down makes the middle bending plate 76 tightly press upward against the puncture needle 21, and then the rear end of the puncture needle passes through the rear through hole 74. And when the middle bending plate 76 is pressed down, the vertical plate 77 moves downward accordingly and passes through the avoidance groove on the lower plate 75 and the front cylinder 71, so that the rear cylinder 72 can be limited to move backward relative to the front cylinder 71. In this way, the assembly is completed.

[0058] After the puncture is successful, the puncture needle 21 retreats to the position of the needle-puncture prevention device 5, and the puncture needle 21 leaves the middle bending plate 76, and the middle bending plate 76 returns to its original shape upward, and the rear cylinder 72 can also move backward. Due to the obstruction of the middle bending plate 76, the needle head cannot pass through the one-way blocking member forward; because the inner diameter of the rear end through hole 74 is larger than the outer diameter of the puncture needle 21 and smaller than the outer diameter of the limiting portion 23, the limiting portion 23 cannot pass through the rear end through hole 74 backward. In this way, the needle head is restricted in the needle-puncture prevention device 5.

[0059] Embodiment three: The difference between this embodiment and the first embodiment lies in the different structure of the needle stick protection device 5 .

[0060] like Figures 18 to 21 As shown, the structure of the needle stick prevention device 5 in this embodiment is as follows: The anti-needlestick device 5 includes a large-diameter limiting cylinder 81 and a small-diameter guiding cylinder 82. The limiting cylinder 81 is lockably and movably installed at the rear end opening of the anti-backflow device 3, and a through hole is provided at the rear end of the limiting cylinder 81; the front end of the guiding cylinder 82 is provided with an opening of the same diameter as the through hole, and is fixed correspondingly at the rear end through hole of the limiting cylinder 81.

[0061] A front end sealing plate is fixedly provided at the front end of the limiting cylinder 81, and a front end through hole 83 for the puncture needle to pass through is provided at the center position of the front end sealing plate; a rear end sealing plate is fixedly provided at the rear end of the guide cylinder 82, and a rear end through hole 84 for the puncture needle to pass through is provided on the rear end sealing plate.

[0062] A limiting portion 23 is provided at the front end of the puncture needle 21, and the inner diameter of the front end through hole 83 is larger than the outer diameter of the limiting portion 23; the inner diameter of the rear end through hole 84 is larger than the outer diameter of the puncture needle 21 and smaller than the outer diameter of the limiting portion 23; the inner diameter of the rear end perforation of the limiting cylinder 81 and the front end opening of the guide cylinder 82 are larger than the outer diameter of the limiting portion 23.

[0063] A one-way blocking member is provided in the limiting cylinder 81, and the one-way blocking member includes a sliding seat 85. A sliding rod 86 extending upward is fixed on the upper side of the sliding seat 85. The sliding rod 86 slides through the limiting cylinder 81 and the anti-backflow device 3 to achieve sliding cooperation between the sliding seat 85 and the limiting cylinder 81 in the upper and lower directions. A stopper 88 pointing to the puncture needle 21 is fixed on the lower side of the sliding seat 85, and an elastic mechanism is provided between the upper side of the sliding seat 85 and the limiting cylinder 81. The elastic mechanism is an elastic body 87, and the upper and lower ends of the elastic body 87 are respectively connected to the sliding seat 85 and the limiting cylinder 81.

[0064] In other embodiments, the elastic mechanism may also be a spring or the like.

[0065] In this embodiment, the limiting tube 81 is a multi-semicircular structure, and the empty portion is used as an extension space for the stopper 88 to pass downward. At the same time, a perforation is provided on the limiting tube 81 at a position corresponding to the stopper 88 .

[0066] The working principle of the needle stick prevention device 5 in this embodiment is as follows: The assembly method of the puncture needle 21 is the same as that of the first embodiment.

[0067] When the rear end of the puncture needle 21 passes through the anti-backflow device 3, the rear end of the puncture needle 21 first passes through the front through hole 83, and then enters the one-way blocking member, and the sliding seat 85 and the sliding rod 86 are moved upward by the matching tool, thereby driving the stopper 88 to move upward, and the rear end of the puncture needle passes through the rear through hole 84. Then the matching tool is removed, and the stopper 88 is reset and moved downward under the action of the elastic body 87, and tightly pressed downward against the puncture needle 21. And when the sliding rod 86 moves upward and passes through the limiting cylinder 81 and the anti-backflow device 3, it can limit the limiting cylinder 81 from moving backward. In this way, the assembly is completed.

[0068] When the puncture is successful, the puncture needle 21 retreats to the position of the anti-needle puncture device 5, and the puncture needle 21 leaves the block 88, and the block 88 moves downward under the action of the elastic body 87. In addition, the slide bar 86 will also move downward and leave the anti-backflow device 3, and the limit cylinder 81 can move backward. Due to the obstruction of the block 88, the needle head cannot pass through the one-way blocking member forward; because the inner diameter of the rear end through hole 84 is larger than the outer diameter of the puncture needle 21 and smaller than the outer diameter of the limit part 23, the limit part 23 cannot pass through the rear end through hole 84 backward. In this way, the needle head is restricted in the anti-needle puncture device 5.

[0069] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

[0070] If the words "first", "second", etc. are used in this document to limit components, those skilled in the art should know that the use of "first" and "second" is only to facilitate the description of the present invention and simplify the description. Unless otherwise stated, the above words have no special meaning.

[0071] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0072] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A safety indwelling needle for dialysis, characterized in that: It includes an indwelling component, a puncture component, an anti-backflow device, a flow-stop clamp and an anti-needlestick device; The indwelling assembly includes a catheter, a catheter hub, an extension tube, and an infusion interface; The puncture assembly includes a puncture needle and a needle seat, the rear end of the puncture needle is fixedly connected to the needle seat, and the puncture needle penetrates and is slidably connected to the interior of the needle puncture prevention device, the backflow prevention device and the retention assembly; The front end of the anti-backflow device is connected to the infusion interface of the indwelling component, and the rear end is open and connected to the anti-needlestick device; there is an anti-backflow pad in the middle of the anti-backflow device; The anti-needle-stick device penetrates the puncture needle, and the front end cooperates with the rear end opening of the anti-backflow device, and the rear end cooperates with the needle seat; when the puncture is successful, when the puncture needle retreats to the position of the anti-needle-stick device, the needle head is confined in the anti-needle-stick device; The stop clamp is used to temporarily compress the extension tube after puncture, and the stop clamp is removed when not in use.

2. The dialysis safety indwelling needle according to claim 1, characterized in that: The catheter is provided with one or more side holes; the front end of the catheter is an inclined surface; and the catheter is made of a soft polymer material.

3. The dialysis safety indwelling needle according to claim 1, characterized in that: The catheter seat is provided with a protrusion on the upper side and a handle wing on the lower side.

4. The dialysis safety indwelling needle according to claim 1, characterized in that: The front end of the anti-backflow device is a Luer connector, which is connected to the infusion interface of the retention component through the Luer connector; the periphery of the anti-backflow device is arranged with an anti-slip ring.

5. The safety indwelling needle for dialysis according to claim 1, characterized in that: The anti-backflow pad is a liquid silicone molded product with a bowl-shaped arc, and there are cross-distributed cutting edges on both sides of the arc surface. The maximum depth of the cutting edges is 1 / 2 of the wall thickness, and point contact is formed at the intersection to form an openable and closable mouth. In its natural state, the cutting edge is squeezed by the plastic parts on both sides of the anti-backflow pad and is in a closed state; when a puncture needle passes through the cutting edge, the cutting edge is affected by the pressure difference between the inner and outer surfaces and its own shrinkage, which will seal the puncture needle.

6. The safety indwelling needle for dialysis according to claim 1, characterized in that: The needle stick prevention device comprises an inner tube and an outer tube, wherein the outer tube is installed at the rear end opening of the backflow prevention device, and the rear end of the outer tube is set as an opening; the inner tube is installed in the outer tube through the opening and is slidably matched with the outer tube in the front-rear direction; The front ends of the inner tube and the outer tube are fixedly provided with front end sealing plates, and a front end through hole for the puncture needle to pass through is provided at the center of the front end sealing plate; the rear end of the inner tube is fixedly provided with a rear end sealing plate, and a rear end through hole for the puncture needle to pass through is provided on the rear end sealing plate; The front end of the puncture needle is provided with a limiting portion, the outer diameter of the limiting portion is larger than the outer diameter of the puncture needle; the inner diameter of the front through hole is larger than the outer diameter of the limiting portion; the inner diameter of the rear through hole is larger than the outer diameter of the puncture needle and smaller than the outer diameter of the limiting portion; A one-way blocking member is provided in the inner cylinder. The one-way blocking member is an elastic structure integrally composed of a front plate, an upper bending plate and a lower bending plate. The front plate is arranged close to the front end sealing plate of the inner cylinder; the front end of the upper bending plate is connected to the upper side of the front plate, and has an upper protruding portion protruding downward in the middle, and an upper tail tilted upward at the rear end; the front end of the lower bending plate is connected to the lower side of the front plate, and has a lower protruding portion protruding upward in the middle, and has a lower tail tilted downward at the rear end; the upper protruding portion and the lower protruding portion are staggered in the up-down direction and the front-back direction; Upper clamping grooves are provided at the upper sides of the inner tube and the outer tube and at the positions corresponding to the upper tails, and lower clamping grooves are provided at the lower sides of the inner tube and the outer tube and at the positions corresponding to the lower tails.

7. The safety indwelling needle for dialysis according to claim 1, characterized in that: The needle stick prevention device comprises a front tube and a rear tube, wherein the front tube is installed at the rear end opening of the backflow prevention device; the rear end of the front tube and the front end of the rear tube are respectively provided with openings, and the two are plug-connected to form a sliding fit in the front-to-back direction; A front end sealing plate is fixedly provided at the front end of the front cylinder, and a front end through hole for the puncture needle to pass through is provided at the center of the front end sealing plate; a rear end sealing plate is fixedly provided at the rear end of the rear cylinder, and a rear end through hole for the puncture needle to pass through is provided on the rear end sealing plate; The front end of the puncture needle is provided with a limiting portion, the outer diameter of the limiting portion is larger than the outer diameter of the puncture needle; the inner diameter of the front through hole is larger than the outer diameter of the limiting portion; the inner diameter of the rear through hole is larger than the outer diameter of the puncture needle and smaller than the outer diameter of the limiting portion; A one-way blocking member is provided in the space enclosed by the front cylinder and the rear cylinder. The one-way blocking member is an elastic structure composed of a lower plate, a middle bending plate and a vertical plate. The lower plate is installed on the rear cylinder. The middle of the middle bending plate has a bending portion protruding forward. The lower end of the middle bending plate is connected to the lower plate, and the upper end of the middle bending plate is connected to the upper end of the vertical plate. The lower end of the vertical plate extends downward and slides through the lower plate. An avoidance groove is provided on the front cylinder or the rear cylinder at a position corresponding to the vertical plate.

8. The safety indwelling needle for dialysis according to claim 1, characterized in that: The needle stick prevention device comprises a limiting cylinder and a guide cylinder. The limiting cylinder is lockably mounted at the rear end opening of the anti-backflow device, and a perforation is arranged at the rear end of the limiting cylinder. The front end of the guide cylinder is set as an opening and is fixed correspondingly at the rear end perforation of the limiting cylinder. A front end sealing plate is fixedly provided at the front end of the limiting cylinder, and a front end through hole for the puncture needle to pass through is provided at the center of the front end sealing plate; a rear end sealing plate is fixedly provided at the rear end of the guide cylinder, and a rear end through hole for the puncture needle to pass through is provided on the rear end sealing plate; The front end of the puncture needle is provided with a limiting portion, the outer diameter of the limiting portion is larger than the outer diameter of the puncture needle; the inner diameter of the front through hole is larger than the outer diameter of the limiting portion; the inner diameter of the rear through hole is larger than the outer diameter of the puncture needle and smaller than the outer diameter of the limiting portion; the inner diameter of the rear end through hole of the limiting cylinder and the front end opening of the guide cylinder are larger than the outer diameter of the limiting portion; A one-way blocking member is provided in the limiting cylinder, and the one-way blocking member includes a sliding seat that slides with the limiting cylinder in the up and down directions, a stopper pointing to the puncture needle is fixed on the lower side of the sliding seat, and an elastic mechanism is provided between the upper side of the sliding seat and the limiting cylinder.

9. The safety indwelling needle for dialysis according to claim 1, characterized in that: The flow stop clamp includes two clamp bodies arranged opposite to each other, and the two clamp bodies provide clamping force through the elastic band of the outer sleeve; a clamping part is provided at the opposite surfaces of the two clamp bodies, the clamping part is an elongated strip, and a long clamping groove is provided on the side of the clamping part facing the extension tube, and the bottom surface of the clamping groove is a plane, forming a surface contact with the extension tube.

10. The safety indwelling needle for dialysis according to claim 1, characterized in that: The needle seat is convexly arranged, and an exhaust device is fixedly connected to the rear end of the needle seat. The exhaust device consists of an exhaust joint and a filter plug. The filter plug is air-permeable and liquid-impermeable as a whole, and is interference-assembled in the hollow position of the exhaust joint.

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