Needle withdrawing protection device for puncture needle

Abstract

The needle withdrawing protection device comprises a front cylinder and a rear cylinder, and the rear end of the front cylinder is connected with the front end of the rear cylinder in an inserted mode to form sliding fit in the front-back direction. A front end sealing plate is fixedly arranged at the front end of the front cylinder, and a front end via hole is formed in the center of the front end sealing plate; a rear end sealing plate is fixedly arranged at the rear end of the rear cylinder, and a rear end via hole is formed in the rear end sealing plate; a limiting part is arranged at the front end of the puncture needle; the inner diameter of the front-end via hole is greater than the outer diameter of the limiting part; the inner diameter of the rear-end via hole is larger than the outer diameter of the puncture needle and smaller than the outer diameter of the limiting part; a one-way blocking piece is arranged in the space defined by the front cylinder and the rear cylinder and is of an elastic structure integrally formed by a lower plate, a middle bent plate and a vertical plate. And after the puncture is successful, when the needle tube retreats to the position of the needle retreating protection device, the needle head is limited in the needle retreating protection device, so that the needle point is prevented from stabbing medical personnel or patients, and meanwhile, the needle point can be prevented from stabbing workers in the subsequent medical waste treatment process.

Description

Technical Field

[0001] This utility model relates to the field of hemodialysis technology, specifically to a needle withdrawal protection device for puncture needles. Background Technology

[0002] Hemodialysis is one of the renal replacement therapies for patients with acute and chronic renal failure. In traditional hemodialysis treatment, arteriovenous fistula (AVF) needles are commonly used. However, using AVF needles to establish vascular access for patients has significant drawbacks. Due to the high rigidity of the AVF needle, it is easy to damage the blood vessel wall, leading to bleeding and blood loss. At the same time, the high rigidity of the AVF needle makes it difficult to fix, which can easily cause the needle to slip and cause bleeding, resulting in dialysis interruption and affecting the treatment progress. In addition, during hemodialysis, patients need to undergo treatment for up to 4-5 hours, during which their arms must remain still and cannot be moved at will. Even slight movements can increase the risk of the blood vessel wall being punctured or broken by the sharp steel needle, causing swelling of the AVF and large-area subcutaneous congestion, increasing the burden on the patient. At the same time, maintaining a fixed posture for a long time results in poor patient comfort.

[0003] With the advancement of modern medical technology, dialysis indwelling needles are being widely used. After insertion, the needle can be withdrawn, leaving a soft, polymer-based tubular material inside the patient's blood vessel. This does not cause damage to the blood vessel. However, dialysis indwelling needles have the following problems.

[0004] When removing the needle after a puncture, medical staff are at risk of being pricked by the needle tip. This can result in a minor injury or, in severe cases, infection. Furthermore, the direct exposure of the needle tip increases the risk of subsequent medical waste disposal, where staff may be pricked and contract diseases. Utility Model Content

[0005] The purpose of this invention is to provide a needle withdrawal protection device for puncture needles.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A needle withdrawal protection device for a puncture needle includes a front cylinder and a rear cylinder, wherein the rear end of the front cylinder and the front end of the rear cylinder are respectively provided as openings, and the two are inserted and connected to form a sliding fit in the front-rear direction.

[0008] The front end of the front cylinder is fixedly provided with a front end sealing plate, 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 rear cylinder 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.

[0009] The puncture needle has a limiting part at the front end, the outer diameter of which is larger than the outer diameter of the puncture needle; the inner diameter of the front end through hole is larger than the outer diameter of the limiting part; the inner diameter of the rear end through hole is larger than the outer diameter of the puncture needle and smaller than the outer diameter of the limiting part.

[0010] A one-way blocking component is provided in the space enclosed by the front and rear cylinders. The one-way blocking component 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 bending plate has a forward-protruding bending part in the middle. 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.

[0011] Preferably, the front or rear cylinder is provided with a clearance groove at a position corresponding to the vertical plate.

[0012] Preferably, the vertical plates are provided in two rows, one on the left and one on the right.

[0013] Preferably, the unidirectional blocking member is formed by bending an elastic steel sheet.

[0014] Preferably, the front end of the rear cylinder is provided with a plug-in portion, the outer diameter of which is smaller than that of the rear cylinder, forming a step; the outer diameter of the plug-in portion also matches the inner diameter of the front cylinder.

[0015] When the insertion part at the front end of the rear cylinder is inserted into the front cylinder, the rear end of the front cylinder abuts against the step, achieving sliding limit in the front and rear directions.

[0016] Preferably, the front and rear cylinders are cylindrical structures.

[0017] The beneficial effects of this utility model are:

[0018] Compared to ordinary dialysis indwelling needles, this invention features a needle withdrawal protection device for safe indwelling needles. When the needle is successfully inserted and retracted to the position of the needle withdrawal protection device, the needle tip is confined within the device and shielded from external exposure, preventing the needle tip from pricking medical staff or patients and ensuring their safety. Furthermore, it also prevents needle tip injury to staff during subsequent medical waste disposal, reducing the risk of medical personnel contracting bloodborne diseases.

[0019] In this utility model, the front and rear cylinders adopt a separate structure, and the front and rear cylinders can be locked during assembly and unlocked during needle retraction, providing structural support for the state changes of the needle retraction protection device. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall design of this utility model;

[0021] Figure 2 This is a schematic diagram of the retention component in this utility model;

[0022] Figure 3 This is a cross-sectional view of the retention component in this utility model;

[0023] Figure 4 This is a schematic diagram of the puncture assembly and the exhaust device in this utility model;

[0024] Figure 5 This is a cross-sectional view of the puncture assembly and the exhaust device in this utility model;

[0025] Figure 6 This is a schematic diagram of the anti-backflow device in this utility model;

[0026] Figure 7 This is a cross-sectional view of the anti-backflow device in this utility model;

[0027] Figure 8 This is a schematic diagram of the flow stop clamp of this utility model;

[0028] Figure 9 This is a schematic diagram showing the relationship between the puncture needle and the needle withdrawal protection device when the needle is not withdrawn in this utility model;

[0029] Figure 10 for Figure 9 Enlarged view of the central protection device;

[0030] Figure 11 This is a schematic diagram showing the relationship between the puncture needle and the needle withdrawal protection device during needle withdrawal in this utility model;

[0031] Figure 12 for Figure 11 Cross-sectional view.

[0032] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0034] The needle withdrawal protection device of this utility model is used in dialysis safety indwelling needles. The structure and working principle of the needle withdrawal protection device are described in detail below with reference to dialysis safety indwelling needles.

[0035] like Figures 1 to 12 As shown, this embodiment provides a safe indwelling needle for dialysis, including an indwelling component 1, a puncture component 2, an anti-backflow device 3, a flow stop clamp 4, a needle withdrawal protection device 5, and an air venting device 6.

[0036] The indwelling assembly 1 includes a catheter 11, a catheter base 12, an extension tube 13, and an infusion interface 14. The tip of the catheter 11 is beveled for easy puncture and to reduce damage. The catheter 11 includes one to four side holes to increase blood flow while preventing the catheter from adhering to the vessel wall and affecting dialysis. The catheter 11 is tightly integrated with the extension tube 13 and integrally injection molded with the catheter base 12 to avoid clotting during dialysis due to dead angles in the lumen. The catheter 11 is made of a soft polymer material to avoid damage to the vessel wall, reduce the incidence of vascular swelling and bleeding, and extend the lifespan of the patient's arteriovenous fistula. Furthermore, the indwelling catheter material has better biocompatibility than steel needles, resulting in a lower incidence of patient allergies. Patients can move relatively freely, and movement during dialysis will not cause sudden changes in blood flow, eliminating concerns about needle puncture and increasing patient comfort. Contrast-enhancing materials can also be added to the polymer material, giving the catheter 11 a contrast-enhancing function.

[0037] The catheter hub 12 has a protrusion on the upper side and a handle wing on the lower side, providing support for medical staff during puncture, assisting in vascular puncture, and securing the indwelling needle with the protective sleeve to prevent slippage and puncture of the packaging bag during transportation. Furthermore, the handle wing design increases the contact area with the skin, making it easier to secure and preventing displacement due to patient movement during subsequent treatment, thus avoiding discomfort for the patient.

[0038] The puncture assembly includes a puncture needle 21 and a needle hub 22. The rear end of the puncture needle 21 is fixedly connected to the needle hub 22, and the puncture needle 21 is slidably connected through the needle withdrawal protection device 5, the anti-backflow device 3, and the indwelling assembly 1. The puncture needle 21 is a hollow steel needle, and a limiting part 23 is provided at the front end of the puncture needle 21, which, in cooperation with the needle withdrawal protection device 5, prevents the needle tip from being exposed.

[0039] The needle hub 22 has a needle withdrawal protection device 5 at its front end and an exhaust device 6 fixedly connected to its rear end. Blood return can be observed at the end of the needle hub 22 near the exhaust device. The convex design of the needle hub 22 provides magnification, facilitating observation of blood return. Furthermore, the increased gap between the needle hub 22 and the puncture needle 21 and the exhaust device 6 also aids in observing blood return.

[0040] The venting device 6 consists of an venting connector 61 and a filter plug 62. The filter plug 62 is entirely air-permeable but liquid-permeable, and is interference-fitted into the hollow position of the venting connector 61, ensuring safety, reliability, and simple manufacturing process. The venting device 6 has a certain taper to mate with the needle seat 22.

[0041] The anti-backflow device 3 ensures that blood does not leak during puncture and connection. One end of the anti-backflow device 3 is connected to the indwelling component 1, and the other end is connected to the needle withdrawal protection device 5. The end of the anti-backflow device 3 connected to the infusion port 14 on the indwelling component 1 is a Luer connector, and the end connected to the needle withdrawal protection device 5 is an open port 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 hub.

[0042] The anti-backflow pad is a liquid silicone product with a cross-shaped valve. It features a bowl-shaped arc with cross-shaped cutting edges on both sides of the arc. The maximum depth of each cutting edge is half the wall thickness, forming a point contact at the intersection. Under normal conditions, the cutting edges are compressed by the silicone components on both sides, maintaining a sealed state. When an instrument passes through the arc and the cutting edges to transport the instrument or liquid, the pressure difference between the inner and outer surfaces and the cutting edges' own contraction create a seal. This fulfills the functional requirement of the silicone product, continuously maintaining a tight seal.

[0043] The shunt clamp 4 is used to temporarily compress the extension tube after puncture. When in contact with the extension tube, the shunt clamp provides sufficient occlusion to achieve blood flow control without causing excessive pressure that could damage the extension tube. When not in use, the shunt clamp 4 can be removed without compressing the extension tube. It is reusable and convenient to use.

[0044] To achieve a large and uniform contact area between the flow stop clamp and the extension tube 13, the flow stop clamp 4 in this embodiment is configured as follows: The flow stop clamp 4 includes two opposing clamping bodies 41, which are clamped by an outer elastic band 44. A clamping portion 42 is provided on the opposing surfaces of the two clamping bodies 41. The clamping portion 42 is elongated, and an elongated clamping groove 43 is provided on the side of the clamping portion 42 facing the extension tube. The bottom surface of the clamping groove 43 is flat, forming a surface contact fit with the extension tube 13.

[0045] The design of the flow-stopping clip 4 enhances the ease of use of the needle withdrawal protection device for this puncture needle. During use, the flow-stopping clip can be used to open and close the blood circuit. When injecting anticoagulants and connecting the extracorporeal circulation blood circuit, nurses need to pinch the middle section of the tubing with their hands or clamp it with instruments to prevent blood from spurting out of the blood vessels, such as arteriovenous fistulas, if the tubing is not pinched tightly. This would cause some blood loss and waste for the patient, as well as blood contamination and an increased risk of hospital-acquired infections. In addition, if instruments such as hemostatic forceps clamp the middle section of the dialysis indwelling needle too tightly, it will cause the tubing to break, which will also cause blood loss and blood contamination of bed sheets and the work environment.

[0046] The needle withdrawal protection device 5 runs through the puncture needle 21, with its front end engaging with the rear end opening of the anti-backflow device 3 and its rear end engaging with the needle hub 22. When the puncture is successful, as the puncture needle 21 retracts to the position of the needle withdrawal protection device 5, the needle tip is confined within the device, shielded from external exposure, preventing the needle tip from pricking medical staff or patients and ensuring their safety. Furthermore, during subsequent medical waste disposal, it also prevents needle tip injury to staff, reducing the risk of medical personnel contracting bloodborne diseases.

[0047] like Figures 9 to 12 As shown, the structure of the needle withdrawal protection device 5 in this embodiment is as follows:

[0048] The needle withdrawal protection device 5 includes a front cylinder 71 and a rear cylinder 72. The front cylinder 71 is fixedly installed at the rear opening of the anti-backflow device 3. The rear end of the front cylinder 71 and the front end of the rear cylinder 72 are respectively set as openings, and the two are inserted and connected to form a sliding fit in the front-rear direction.

[0049] The rear cylinder 72 has a connector at its front end, the outer diameter of which is smaller than that of the rear cylinder, forming a step. The outer diameter of the connector also matches the inner diameter of the front cylinder 71. When the connector at the front end of the rear cylinder 72 is inserted into the front cylinder 71, the rear end of the front cylinder 71 abuts against the step, achieving sliding limit in the front-rear direction.

[0050] The front end of the front cylinder 71 is fixedly provided with a front end sealing plate, and a front end through hole 73 for the puncture needle to pass through is provided at the center of the front end sealing plate; the rear end of the rear cylinder 72 is fixedly provided with a rear end sealing plate, and a rear end through hole 74 for the puncture needle to pass through is provided on the rear end sealing plate.

[0051] The puncture needle 21 has a limiting part 22 at its front end, and the inner diameter of the front end through hole 73 is larger than the outer diameter of the limiting part 22; 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 part 23.

[0052] A one-way blocking element is provided in the space enclosed by the front cylinder 71 and the rear cylinder 72. The one-way blocking element is an elastic structure integrally composed of a lower plate 75, a middle bent plate 76, and a vertical plate 77. The lower plate 75 is fixedly installed on the rear cylinder. The middle bent plate 76 has a forward-protruding bent portion in the middle. The lower end of the middle bent plate 76 is connected to the lower plate 75, and the upper end of the middle bent 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. Furthermore, a clearance groove is provided on the front cylinder 71 at a position corresponding to the vertical plate 77.

[0053] In this embodiment, two vertical plates 77 are provided, arranged on the left and right sides.

[0054] The working principle of the needle withdrawal protection device 5 in this embodiment is as follows:

[0055] During assembly, a portion of the front end of the puncture needle 21 is first flattened using a special tool, forming an elliptical structure. The other parts of the needle tube remain circular, resulting in a larger diameter at the flattened end compared to the other parts, thus creating a limiting part 23. Then, the puncture needle 21 is inserted backwards from front to back. The rear end of the puncture needle 21 passes through the anti-backflow device 3 and the needle withdrawal protection device 5 before connecting to the needle holder 22.

[0056] 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 down the middle bending plate 76. The rebound force of the middle bending plate 76 after being pressed down makes the middle bending plate 76 press tightly upward against the puncture needle 21. Then the rear end of the puncture needle exits through the rear through hole 74. And after the middle bending plate 76 is pressed down, the vertical plate 77 moves down accordingly and passes through the clearance groove on the lower plate 75 and the front cylinder 71, which can restrict the rear cylinder 72 from moving backward relative to the front cylinder 71. The assembly is then complete.

[0057] After successful puncture, when the puncture needle 21 retracts to the position of the needle withdrawal protection device 5, the puncture needle 21 leaves the middle bending plate 76, and the middle bending plate 76 returns to its original shape upwards. At this time, the rear cylinder 72 can also move backwards. Due to the obstruction of the middle bending plate 76, the needle tip cannot pass forward through the one-way blocking member; since 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 part 23, the limiting part 23 cannot pass backwards out of the rear through hole 74. In this way, the needle tip is confined within the needle withdrawal protection device 5.

[0058] The above embodiments are only used to illustrate and not limit the technical solutions of this utility model. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the utility model without departing from the spirit and scope of the utility model. Any modifications or partial substitutions should be covered within the scope of the claims of this utility model.

[0059] If the terms "first" or "second" are used in this document to define the components, those skilled in the art should know that the use of "first" or "second" is merely for the convenience of describing this utility model and simplifying the description, and unless otherwise stated, the above terms have no special meaning.

[0060] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0061] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A needle withdrawal protection device for a puncture needle, characterized in that: It includes a front cylinder and a rear cylinder, with the rear end of the front cylinder and the front end of the rear cylinder respectively set as openings, and the two are inserted and connected to form a sliding fit in the front-to-back direction; The front end of the front cylinder is fixedly provided with a front end sealing plate, 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 rear cylinder 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 puncture needle has a limiting part at the front end, the outer diameter of which is larger than the outer diameter of the puncture needle; the inner diameter of the front end through hole is larger than the outer diameter of the limiting part; the inner diameter of the rear end through hole is larger than the outer diameter of the puncture needle and smaller than the outer diameter of the limiting part. A one-way blocking component is provided in the space enclosed by the front and rear cylinders. The one-way blocking component 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 bending plate has a forward-protruding bending part in the middle. 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.

2. The needle withdrawal protection device for the puncture needle according to claim 1, characterized in that: The front or rear cylinder is provided with a clearance groove at a position corresponding to the vertical plate.

3. The needle withdrawal protection device for the puncture needle according to claim 2, characterized in that: The vertical plates are arranged in two rows, one on the left and one on the right.

4. The needle withdrawal protection device for the puncture needle according to any one of claims 1-3, characterized in that: The one-way blocking element is made of bent elastic steel sheet.

5. The needle withdrawal protection device for the puncture needle according to any one of claims 1-3, characterized in that: The rear cylinder has a connector at its front end, the outer diameter of which is smaller than that of the rear cylinder, forming a step; the outer diameter of the connector also matches the inner diameter of the front cylinder. When the insertion part at the front end of the rear cylinder is inserted into the front cylinder, the rear end of the front cylinder abuts against the step, achieving sliding limit in the front and rear directions.

6. The needle withdrawal protection device for the puncture needle according to claim 5, characterized in that: The front and rear cylinders are cylindrical structures.

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