Anti-needling device of safety remaining needle
By designing an anti-needle-puncture device, which utilizes the sliding fit between the inner and outer cylinders and a one-way blocking component to limit needle retraction, the problem of needle tip puncture injury from traditional indwelling needles is solved, improving the safety and comfort of the dialysis process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HENAN TUOREN BEST MEDICAL DEVICE CO LTD
- Filing Date
- 2025-01-16
- Publication Date
- 2026-04-24
AI Technical Summary
Traditional arteriovenous fistula needles are rigid and can easily damage the blood vessel wall. Furthermore, there is a risk of needle tip injury to medical staff and patients during the puncture process, affecting the treatment process and safety.
Design an anti-needle puncture device comprising an inner cylinder and an outer cylinder, wherein the inner cylinder and the outer cylinder slide together, and a one-way blocking part and a limiting part are provided to prevent the needle tip from being exposed to the outside. The limiting part and the slot structure restrict the position of the needle tip when it retracts, ensuring that the needle tip is shielded.
It effectively prevents needlestick injuries to medical staff and patients, reduces the risk of infection for medical staff, improves the safety and comfort of the dialysis process, and reduces the risk of needle exposure.
Smart Images
Figure CN224155734U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hemodialysis technology, specifically to a needle-puncture prevention device for a safe indwelling needle. 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 object 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 prevention device for a safe indwelling needle.
[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0007] A needle-puncture prevention device for a safety indwelling needle includes an inner cylinder and an outer cylinder, the rear end of the outer cylinder being an opening; the inner cylinder is installed in the outer cylinder through the opening and slides with it in the front-back direction.
[0008] Both the inner and outer cylinders are fixedly provided with front end sealing plates, and the front end sealing plates are provided with front end through holes for the puncture needle to pass through at the center position; the inner cylinder is fixedly provided with rear end sealing plates, and the rear end sealing plates are provided with rear end through holes for the puncture needle to pass through.
[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] The inner cylinder is equipped with a one-way blocking component, which is an elastic structure composed of a front plate, an upper bending plate, and a lower bending plate. The front plate is set near the front end of the inner cylinder. The front end of the upper bending plate is connected to the upper side of the front plate, and has a downward protruding upper protrusion in the middle and an upward-curving upper tail at the rear end. The front end of the lower bending plate is connected to the lower side of the front plate, and has an upward-protruding lower protrusion in the middle and a downward-curving lower tail at the rear end. The upper and lower protrusions are staggered in the vertical and horizontal directions and the front and back directions.
[0011] Based on the above, upper slots are provided on the upper sides of the inner and outer cylinders corresponding to the upper tail, and lower slots are provided on the lower sides of the inner and outer cylinders corresponding to the lower tail.
[0012] Based on the above, the one-way blocking member is formed by bending an elastic steel sheet.
[0013] Based on the above, the rear end of the inner cylinder extends rearward beyond the outer cylinder.
[0014] Based on the above, the inner cylinder and the outer cylinder are cylindrical structures.
[0015] The beneficial effects of this utility model are:
[0016] Compared to ordinary dialysis indwelling needles, this invention features a needle-puncture prevention device for safe indwelling needles. When the needle is successfully inserted and retracted to the position of the needle-puncture prevention 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.
[0017] In this invention, the inner and outer cylinders adopt a separate structure, and the inner and outer cylinders can be locked during assembly and unlocked when the needle is withdrawn, providing structural support for changes in the state of the anti-needle puncture device. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the overall design of this utility model;
[0019] Figure 2 This is a schematic diagram of the retention component in this utility model;
[0020] Figure 3 This is a cross-sectional view of the retention component in this utility model;
[0021] Figure 4 This is a schematic diagram of the puncture assembly and the exhaust device in this utility model;
[0022] Figure 5 This is a cross-sectional view of the puncture assembly and the exhaust device in this utility model;
[0023] Figure 6 This is a schematic diagram of the anti-backflow device in this utility model;
[0024] Figure 7 This is a cross-sectional view of the anti-backflow device in this utility model;
[0025] Figure 8 This is a schematic diagram of the flow stop clamp of this utility model;
[0026] Figure 9 This is a schematic diagram showing the relationship between the puncture needle and the anti-needle puncture device when the needle is not withdrawn in this utility model;
[0027] Figure 10 for Figure 9 Enlarged view of the part of the needle-punching device in the middle;
[0028] Figure 11 This is a schematic diagram showing the relationship between the puncture needle and the anti-needle puncture device during needle withdrawal in this utility model;
[0029] Figure 12 for Figure 11 Cross-sectional view;
[0030] Figure 13 This is a schematic diagram of the installation of the puncture needle in this utility model.
[0031] 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
[0032] 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.
[0033] The needle-puncture prevention device of this utility model is used in a dialysis safety indwelling needle. The structure and working principle of the needle-puncture prevention device are described in detail below with reference to the dialysis safety indwelling needle.
[0034] like Figures 1 to 13 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 device 5, and an exhaust device 6.
[0035] 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.
[0036] 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.
[0037] 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-puncture 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-puncture device 5.
[0038] The needle hub 22 has an anti-puncture 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.
[0039] 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.
[0040] 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 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 anti-needle-puncture 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 separation of the anti-backflow device from the needle hub.
[0041] 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.
[0042] 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.
[0043] 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.
[0044] The design of the flow-stopping clip 4 enhances the ease of use of the needlestick-proof device for this safety indwelling 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 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.
[0045] The anti-needle-puncture device 5 is inserted 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 and the puncture needle 21 retracts to the position of the anti-needle-puncture device 5, the needle tip is confined within the anti-needle-puncture device 5, the needle tip is shielded and not exposed to the outside, preventing the needle tip from puncturing medical staff or patients, ensuring the safety of medical staff and patients. At the same time, it can also prevent the needle tip from puncturing staff during subsequent medical waste disposal, reducing the risk of medical staff contracting bloodborne diseases.
[0046] like Figures 9 to 13 As shown, the structure of the anti-needle puncture device 5 in this embodiment is as follows:
[0047] The anti-needle puncture device 5 includes an outer cylinder 51 and an inner cylinder 52. The outer cylinder 51 is fixedly installed at the rear end opening of the anti-backflow device 3, and the rear end of the outer cylinder 51 is set as an opening. The inner cylinder 52 is installed in the outer cylinder 51 through the opening and slides with it in the front-back direction.
[0048] Both the inner cylinder 52 and the outer cylinder 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 of the front end sealing plate; the inner cylinder 52 is fixedly provided with a rear end sealing plate 54, and a rear end through hole 55 for the puncture needle to pass through is provided on the rear end sealing plate 54.
[0049] The front end of the puncture needle 21 is provided with a limiting part 23, the outer diameter of the limiting part 23 is larger than the outer diameter of the puncture needle 21; the inner diameter of the front end through hole 53 is larger than the outer diameter of the limiting part 53; 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 part 23.
[0050] The inner cylinder 22 is equipped with a one-way blocking component, which is an elastic structure integrally composed of a front plate 56, an upper bent plate 57, and a lower bent plate 58. The material can be a thin steel plate with elasticity. The front plate 56 is set as a front end cap near the inner cylinder; the front end of the upper bent plate 57 is connected to the upper side of the front plate, with a downward protruding upper part in the middle and an upward-curving upper tail at the rear end; the front end of the lower bent plate 58 is connected to the lower side of the front plate 56, with an upward protruding lower part in the middle and a downward-curving lower tail at the rear end. The upper and lower protruding parts are staggered in the vertical and horizontal directions and the front-back direction.
[0051] Upper slots are provided on the upper sides of the inner cylinder 52 and the outer cylinder 51 corresponding to the upper tail, and lower slots are provided on the lower sides of the inner cylinder 52 and the outer cylinder 51 corresponding to the lower tail.
[0052] The working principle of the anti-needle-puncture device 5 in this embodiment is as follows:
[0053] During assembly, such as Figure 13As shown, 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. This makes the diameter of the flattened portion larger than the diameter of the other parts, 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 through the anti-backflow device 3 and the anti-needle-puncture device 5 before connecting to the needle hub 22.
[0054] 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, which opens the upper bending plate 57 and the lower bending plate 58. After the upper bending plate 57 and the lower bending plate 58 are opened, they will clamp onto the puncture needle 21. Then the rear end of the puncture needle will exit through the rear through hole 55. Furthermore, when the upper bending plate 57 and the lower bending plate 58 are opened, the upper tail of the upper bending plate 57 will move and get stuck in the upper slot, and the lower tail of the lower bending plate 58 will move and get stuck in the lower slot, thereby restricting the inner cylinder 52 from moving backward relative to the outer cylinder 51. This completes the assembly.
[0055] After a successful puncture, when the puncture needle 21 retracts to the position of the anti-puncture device 5, it separates from the upper bending plate 57 and the lower bending plate 58, which then return to their original shapes. Because the upper and lower protrusions are misaligned in the vertical and horizontal directions and the front-back direction, the needle cannot pass forward through the one-way blocking member; and because 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 part 23, the limiting part 23 cannot pass backward through the rear through-hole 55. Thus, the needle is confined within the anti-puncture device 5.
[0056] 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.
[0057] 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.
[0058] 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.
[0059] 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 stick prevention device for a safety retention needle, comprising: It includes an inner cylinder and an outer cylinder, with the rear end of the outer cylinder being open; the inner cylinder is installed in the outer cylinder through the opening and slides with it in the front-to-back direction; Both the inner and outer cylinders are fixedly provided with front end sealing plates, and the front end sealing plates are provided with front end through holes for the puncture needle to pass through at the center position; the inner cylinder is fixedly provided with rear end sealing plates, and the rear end sealing plates are provided with rear end through holes for the puncture needle to pass through. 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. The inner cylinder is equipped with a one-way blocking component, which is an elastic structure composed of a front plate, an upper bending plate, and a lower bending plate. The front plate is set near the front end of the inner cylinder. The front end of the upper bending plate is connected to the upper side of the front plate, and has a downward protruding upper protrusion in the middle and an upward-curving upper tail at the rear end. The front end of the lower bending plate is connected to the lower side of the front plate, and has an upward-protruding lower protrusion in the middle and a downward-curving lower tail at the rear end. The upper and lower protrusions are staggered in the vertical and horizontal directions and the front and back directions.
2. The needle stick prevention device for a safety catheter needle of claim 1 wherein: The upper side of the inner cylinder and the outer cylinder, corresponding to the upper tail, are provided with upper slots, and the lower side of the inner cylinder and the outer cylinder, corresponding to the lower tail, are provided with lower slots.
3. A needle stick protection device for a safety catheter needle as defined in claim 1 or 2, characterized in that: The one-way blocking element is made of bent elastic steel sheet.
4. The needle stick prevention device of a safety catheter needle according to claim 1 or 2, wherein: The rear end of the inner cylinder extends backward beyond the outer cylinder.
5. The needle stick prevention device of a safety catheter needle according to claim 4, wherein: The inner and outer cylinders are cylindrical structures.