Anti-needling protection device for safe remaining needle for dialysis

Abstract

The anti-needling protection device comprises a limiting cylinder and a guide cylinder, the front end of the guide cylinder is provided with an opening, and the guide cylinder is correspondingly fixed to a penetrating hole in the rear end of the limiting cylinder; a front end via hole is fixedly formed in the front end of the limiting cylinder; a rear end via hole is formed in the rear end of the guide cylinder; 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 limiting cylinder and comprises a sliding base and an elastic mechanism, and a check block pointing to the puncture needle is fixed to the lower side of the sliding base. When puncture succeeds and the needle tube retreats to the position of the anti-acupuncture protection device, the needle head is limited in the anti-acupuncture protection device, safety of medical staff and patients is guaranteed, meanwhile, in the follow-up medical waste treatment process, the needle point can be prevented from stabbing workers, and the risk that the medical staff are infected with blood spread diseases is reduced.

Description

Technical Field

[0001] This utility model relates to the field of hemodialysis technology, specifically to a needle-puncture protection device for a safety indwelling needle used in dialysis. 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-puncture protection device for a safe indwelling needle used in dialysis.

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

[0007] A needle-puncture protection device for dialysis safety indwelling needles includes a limiting cylinder and a guide cylinder. The limiting cylinder is lockably and movably installed at the rear opening of the anti-backflow device, and the rear end of the limiting cylinder has a perforation. The front end of the guide cylinder is open and is fixed to the rear end perforation of the limiting cylinder.

[0008] The front end of the limiting 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 guide 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 but smaller than the outer diameter of the limiting part; the inner diameter of the rear end through hole of the limiting cylinder and the front end opening of the guide cylinder is larger than the outer diameter of the limiting part.

[0010] The limiting cylinder is provided with a one-way blocking component, which includes a sliding seat that slides with the limiting cylinder in the vertical direction. A stop block pointing towards 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.

[0011] Furthermore, an upwardly extending slide rod is fixed on the upper side of the sliding seat. The slide rod slides through the limiting cylinder and the anti-backflow device to achieve sliding cooperation between the sliding seat and the limiting cylinder in the vertical direction.

[0012] Furthermore, two parallel sliding rods are provided.

[0013] Furthermore, the elastic mechanism is located between the two slide bars.

[0014] Furthermore, the elastic mechanism is an elastic body, with its upper and lower ends connected to the sliding seat and the limiting cylinder, respectively.

[0015] Furthermore, the elastic mechanism is a spring, with its upper and lower ends connected to the sliding seat and the limiting cylinder, respectively.

[0016] Furthermore, the limiting cylinder is a large-diameter cylindrical cylinder, and the guide cylinder is a small-diameter cylindrical cylinder.

[0017] Furthermore, the limiting cylinder has a semi-circular structure, with the empty part used for the downward extension space of the stop block, and a through hole is provided on the limiting cylinder at the position corresponding to the stop block.

[0018] The beneficial effects of this utility model are:

[0019] Compared to ordinary dialysis indwelling needles, this invention features a needle-puncture protection device for safe indwelling needles. When the needle is successfully inserted and retracted to the position of the needle-puncture protection device, 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, it also prevents needle tip injury to staff during subsequent medical waste disposal, reducing the risk of medical personnel contracting bloodborne diseases.

[0020] In this utility model, the limiting cylinder and the anti-backflow device are installed separately at their rear ends. The limiting cylinder and the anti-backflow device can be locked during assembly and unlocked when the needle is withdrawn, providing structural support for the state changes of the anti-needle puncture protection device. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall design of this utility model;

[0022] Figure 2 This is a schematic diagram of the retention component in this utility model;

[0023] Figure 3 This is a cross-sectional view of the retention component in this utility model;

[0024] Figure 4 This is a schematic diagram of the puncture assembly and the exhaust device in this utility model;

[0025] Figure 5 This is a cross-sectional view of the puncture assembly and the exhaust device in this utility model;

[0026] Figure 6 This is a schematic diagram of the anti-backflow device in this utility model;

[0027] Figure 7 This is a cross-sectional view of the anti-backflow device in this utility model;

[0028] Figure 8 This is a schematic diagram of the flow stop clamp of this utility model;

[0029] Figure 9 This is a schematic diagram showing the relationship between the puncture needle and the anti-needle puncture protection device when the needle is not withdrawn in this utility model;

[0030] Figure 10 for Figure 9 Enlarged view of the part of the needle-punch protection device in the middle;

[0031] Figure 11 This is a schematic diagram showing the relationship between the puncture needle and the anti-needle puncture protection device during needle withdrawal in this utility model;

[0032] Figure 12 for Figure 11 Cross-sectional view.

[0033] 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

[0034] 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.

[0035] The needle-puncture protection device of this utility model is used in the safety indwelling needle for dialysis. The structure and working principle of the needle-puncture protection device are described in detail below with reference to the safety indwelling needle for dialysis.

[0036] 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, an anti-needle puncture protection device 5, and an exhaust device 6.

[0037] 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.

[0038] 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.

[0039] 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 anti-needle puncture 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 to prevent the needle tip from being exposed by cooperating with the anti-needle puncture protection device 5.

[0040] The needle hub 22 has an anti-puncture 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.

[0041] 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.

[0042] 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 anti-needle-puncture protection device 5. The end of the anti-backflow device 3 that connects to the infusion port 14 on the indwelling component 1 is a Luer connector, and the end that connects to the anti-needle-puncture protection 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 separation of the anti-backflow device from the needle hub.

[0043] 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.

[0044] 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 hemostasis 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.

[0045] 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.

[0046] The design of the flow-stopping clip 4 enhances the ease of use of this needlestick protection device for dialysis safety indwelling needles. During use, the flow-stopping clip can be used to open and close the blood circuit. When injecting anticoagulants and connecting the extracorporeal circulation 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 result in the loss and waste of some blood from 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.

[0047] The needle puncture 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 puncture protection device 5, the needle tip is confined within the device, shielded from external exposure, preventing the needle tip from puncturing 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.

[0048] like Figures 9 to 12 As shown, the structure of the anti-needle puncture protection device 5 in this embodiment is as follows:

[0049] The anti-needle puncture protection device 5 includes a large-diameter limiting cylinder 81 and a small-diameter guide cylinder 82. The limiting cylinder 81 is lockably and movably installed at the rear end opening of the anti-backflow device 3, and the rear end of the limiting cylinder 81 is provided with a through hole. The front end of the guide cylinder 82 is provided with an opening of the same diameter as the through hole, and is fixed to the rear end through hole of the limiting cylinder 81.

[0050] The front end of the limiting cylinder 81 is fixedly provided with a front end sealing plate, and a front end through hole 83 for the puncture needle to pass through is provided at the center of the front end sealing plate; the rear end of the guide cylinder 82 is fixedly provided with a rear end sealing plate, and a rear end through hole 84 for the puncture needle to pass through is provided on the rear end sealing plate.

[0051] The puncture needle 21 has a limiting part 23 at its front end, and the inner diameter of the front end through hole 83 is greater than the outer diameter of the limiting part 23; the inner diameter of the rear end through hole 84 is greater than the outer diameter of the puncture needle 21 and less than the outer diameter of the limiting part 23; the inner diameter of the rear end through hole of the limiting cylinder 81 and the front end opening of the guide cylinder 82 is greater than the outer diameter of the limiting part 23.

[0052] The limiting cylinder 81 is equipped with a one-way blocking component, which includes a sliding seat 85. An upwardly extending sliding rod 86 is fixed to the upper side of the sliding seat 85. The sliding rod 86 slides through the limiting cylinder 81 and the anti-backflow device 3, achieving a sliding engagement between the sliding seat 85 and the limiting cylinder 81 in the vertical direction. A stop block 88 pointing towards the puncture needle 21 is fixed to the lower side of the sliding seat 85. 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, with its upper and lower ends connected to the sliding seat 85 and the limiting cylinder 81, respectively.

[0053] In other embodiments, the elastic mechanism may also be a spring or the like.

[0054] In this embodiment, the limiting cylinder 81 has a semi-circular structure, and the empty part is used for the downward extension space of the stop 88. At the same time, the limiting cylinder 81 is provided with a through hole at the position corresponding to the stop 88.

[0055] The working principle of the anti-needle puncture protection device 5 in this embodiment is as follows:

[0056] 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 needle tube portions of the puncture needle 21 remain circular. This makes the diameter of the flattened portion larger than the diameter of the other needle tubes, forming 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 sequentially through the anti-backflow device 3 and the anti-needle-puncture protection device 5 before connecting to the needle hub 22.

[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 83, and then enters the one-way blocking member. The sliding seat 85 and the sliding rod 86 are moved upward by the cooperating tool, which in turn moves the stop block 88 upward, and the rear end of the puncture needle exits through the rear through hole 84. Then the cooperating tool is removed, and the stop block 88, under the action of the elastic body 87, resets and moves downward, pressing firmly against the puncture needle 21. Furthermore, when the sliding rod 86 moves upward through the limiting cylinder 81 and the anti-backflow device 3, it can restrict the backward movement of the limiting cylinder 81. This completes the assembly.

[0058] After successful puncture, when the puncture needle 21 retracts to the position of the anti-puncture protection device 5, the puncture needle 21 leaves the stop block 88, and the stop block 88 moves downward under the action of the elastic body 87. The slide rod 86 also moves downward away from the anti-backflow device 3, and the limiting cylinder 81 can move backward. Due to the obstruction of the stop block 88, the needle tip cannot pass forward through the one-way blocking member; because the inner diameter of the rear through hole 84 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 backward through the rear through hole 84. Thus, the needle tip is confined within the anti-puncture protection device 5.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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 needlestick-proof protection device for a safety indwelling needle used in dialysis, characterized in that: It includes a limiting cylinder and a guide cylinder. The limiting cylinder is lockably and movably installed at the rear opening of the anti-backflow device, and the rear end of the limiting cylinder has a through hole. The front end of the guide cylinder is open and is fixed to the rear through hole of the limiting cylinder. The front end of the limiting 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 guide 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 but smaller than the outer diameter of the limiting part; the inner diameter of the rear end through hole of the limiting cylinder and the front end opening of the guide cylinder is larger than the outer diameter of the limiting part. The limiting cylinder is provided with a one-way blocking component, which includes a sliding seat that slides with the limiting cylinder in the vertical direction. A stop block pointing towards 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.

2. The needlestick protection device for a safety indwelling needle for dialysis according to claim 1, characterized in that: The upper side of the sliding seat is fixed with an upwardly extending sliding rod. The sliding rod slides through the limiting cylinder and the anti-backflow device to realize the sliding cooperation between the sliding seat and the limiting cylinder in the vertical direction.

3. The needlestick protection device for a safety indwelling needle for dialysis according to claim 2, characterized in that: The slide bar is provided in two parallel sections.

4. The needlestick protection device for a safety indwelling needle for dialysis according to claim 3, characterized in that: The elastic mechanism is located between the two slide bars.

5. The needlestick protection device for a safety indwelling needle for dialysis according to any one of claims 1-4, characterized in that: The elastic mechanism is an elastic body, and the upper and lower ends of the elastic body are connected to the sliding seat and the limiting cylinder, respectively.

6. The needlestick protection device for a safety indwelling needle for dialysis according to any one of claims 1-4, characterized in that: The elastic mechanism is a spring, with its upper and lower ends connected to the sliding seat and the limiting cylinder, respectively.

7. The needlestick protection device for a safety indwelling needle for dialysis according to claim 1, characterized in that: The limiting cylinder is a large-diameter cylindrical cylinder, and the guide cylinder is a small-diameter cylindrical cylinder.

8. The needlestick protection device for a safety indwelling needle for dialysis according to claim 7, characterized in that: The limiting cylinder has a semi-circular structure, with the empty part used for the downward extension space of the stop block, and a through hole is provided on the limiting cylinder at the position corresponding to the stop block.

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