Anti-reflux indwelling needle

Abstract

The utility model relates to medical instrument technical field especially is a kind of anti-reflux indwelling needle, including needle seat part, soft needle tube, puncture hard needle and liquid injection component, soft needle tube includes first needle tube section and second needle tube section, first needle tube section is connected with needle seat part, second needle tube section is connected with baffle, baffle and second needle tube section end portion between being provided with cooperation clearance, the baffle is made of rubber material, the puncture hard needle passes through the baffle;Second needle tube section is provided with the plugging valve block in;Plugging valve block and second needle tube section between there is first cooperation state and second cooperation state.The utility model is in the operation of sealing pipe by pulse method and injects sealing pipe liquid, can make needle seat part and the strong pulse jet in soft needle tube, plugging valve block can slide to the cooperation clearance between second needle tube section and baffle under the impetus of pulse jet, the end opening of second needle tube section is closed, so effectively avoid the blockage of soft needle tube caused by blood reflux.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to an anti-backflow indwelling needle. Background Technology

[0002] Indwelling needles are characterized by their soft cannula, thin needle body, low irritation, safety, speed, simple operation, and easy fixation. The use of indwelling intravenous needles has become an important way of clinical treatment for emergency medication, blood transfusion, and nutrition. At the same time, indwelling intravenous needles not only relieve patients of the pain of repeated venipuncture and protect their blood vessels, but also greatly reduce the workload of nurses and improve work efficiency.

[0003] Positive pressure sealing is a crucial step in the effective application of indwelling needle technology. The specific procedure involves sealing the indwelling intravenous needle with an appropriate amount of sealing solution after the infusion is completed. Throughout the sealing process, the entire infusion line is maintained under positive pressure, thus preventing blood backflow into the catheter tip and causing blockage.

[0004] However, even after the catheter sealing procedure, excessive patient activity and / or the effect of gravity from limb drooping can still cause blood to flow back into the catheter, potentially leading to catheter blockage.

[0005] Therefore, preventing blood from flowing back into the catheter during the clinical use of indwelling needles is a technical problem that urgently needs to be solved in the current technology. Utility Model Content

[0006] The purpose of this invention is to address the problem in existing technologies where, after the catheter sealing procedure, blood may still flow back into the catheter due to excessive patient activity and / or the gravitational effect of limb drooping, potentially causing catheter blockage. This invention provides an anti-backflow indwelling needle.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An anti-backflow indwelling needle includes a needle hub, a soft needle tube, a puncture needle, and an injection component. The needle hub has a receiving cavity. The central axis of the soft needle tube coincides with the central axis of the needle hub and communicates with the receiving cavity. A sealing rubber is provided at one end of the needle hub relative to the soft needle tube. The puncture needle passes through the sealing rubber portion into the receiving cavity of the needle hub, with its end extending beyond the end of the soft needle tube. The puncture needle is detachably connected to the needle hub and the soft needle tube. The injection component is connected to the side of the needle hub and is used to deliver medication into the cavity of the needle hub. The soft needle tube includes a first needle tube segment and a second needle tube segment. The first needle tube segment is connected to the needle hub. A baffle is connected to the second needle tube segment. A fitting gap is provided between the baffle and the end of the second needle tube segment. The baffle is made of rubber material. The puncture needle passes through the baffle. A sealing valve block is provided inside the second needle tube section. The length of the sealing valve block is greater than the width of the fitting gap between the baffle and the end of the second needle tube section. When the second needle tube section is under positive pressure, the sealing valve block is open; when the second needle tube section is under negative pressure, the sealing valve block is closed. The sealing valve block and the second needle tube section have a first mating state and a second mating state. In the first engagement state, the sealing valve block is located inside the second needle tube section; When the positive pressure in the second needle tube section reaches the set value, the sealing valve block slides along the second needle tube section. When the sealing valve block is located in the fitting gap between the second needle tube section and the baffle, the two form a second fitting state, and the sealing valve block is in the closed state in the second fitting state.

[0008] Preferably, the inner diameter of the first needle segment is larger than the inner diameter of the second needle segment.

[0009] Preferably, the junction between the first needle segment and the second needle segment is configured as a flared structure.

[0010] Preferably, a ring plate is provided inside the second needle tube section, the ring plate being used to prevent the sealing valve block from entering the first needle tube section.

[0011] Preferably, the surface of the needle hub that contacts human skin is configured as a planar structure.

[0012] Preferably, the injection component includes an extension tube and a tee connector. The extension tube is connected to the needle hub, and a fixing seat is provided on the extension tube. The fixing seat is used to create a gap between the extension tube and the human skin.

[0013] Preferably, the side of the fixing seat that contacts human skin is adhesive.

[0014] Preferably, the fixing base and the extension tube are slidably connected.

[0015] Preferably, the fixing base is further provided with a strap for connecting to a human limb.

[0016] Preferably, the puncture needle includes a needle body and a wing plate, and when the needle body is inserted into the needle seat and the internal cavity of the soft needle tube, the wing plate is formed on the side of the needle seat.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: 1. The anti-backflow indwelling needle of this utility model, during the sealing operation, injects sealing fluid in a pulsed manner, which can generate a strong pulse jet in the needle seat and the soft needle tube. Under the push of the pulse jet, the sealing valve block can slide to the fitting gap between the second needle tube section and the baffle, and close the end opening of the second needle tube section. This effectively avoids blood backflow causing blockage of the soft needle tube, and improves the practicality of this invention in actual use. 2. In the anti-backflow indwelling needle of this utility model, the inner diameter of the first needle tube section is larger than that of the second needle tube section. This structural design allows for a faster flow rate of the sealing fluid entering the second needle tube section, resulting in a greater positive pressure applied to the sealing valve block. Consequently, the sealing valve block can slide more smoothly within the second needle tube section, further improving the practicality of this invention in actual use. Furthermore, the junction between the first and second needle tube sections is designed as a flared structure. This structural design makes the junction of the first and second needle tube sections smoother, reducing energy loss during the passage of the sealing fluid and further increasing the positive pressure applied to the sealing valve block, ensuring the smooth sliding of the sealing valve block within the second needle tube section. 3. The anti-backflow indwelling needle of this utility model includes an injection component comprising an extension tube and a T-connector. The extension tube is connected to the needle seat, and a fixing seat is provided on the extension tube to create a gap between the extension tube and the human skin. This structural design reduces the risk of the extension tube injuring the human skin, thereby further improving the practicality of this invention in actual use. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a backflow prevention indwelling needle; Figure 2 This is a cross-sectional structural diagram showing the first mating state between the sealing valve block and the second needle tube section; Figure 3 This is a cross-sectional structural diagram showing the second mating state between the sealing valve block and the second needle tube section.

[0019] The markings in the diagram are: 1-needle seat, 2-soft needle tube, 3-puncture hard needle, 4-injection component, 5-first needle tube section, 6-second needle tube section, 7-baffle, 9-sealing valve block, 10-ring plate, 11-extension tube, 12-tee connector, 13-fixing seat, 14-bandage, 15-needle body, 16-wing plate. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings.

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.

[0022] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely to illustrate some embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0023] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of this utility model, it should be noted that the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms are only for the convenience of describing this utility model and simplifying the description, and do not 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 on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] Example 1 like Figures 1 to 3As shown, the present invention discloses an anti-backflow indwelling needle, comprising a needle seat 1, a soft needle tube 2, a puncture needle 3, and an injection component 4. The needle seat 1 has a receiving cavity. The central axis of the soft needle tube 2 coincides with the central axis of the needle seat 1, and the soft needle tube 2 communicates with the receiving cavity of the needle seat 1. A sealing rubber is provided at one end of the needle seat 1 relative to the soft needle tube 2. The puncture needle 3 penetrates into the receiving cavity of the needle seat 1 through the sealing rubber, and the end of the puncture needle 3 extends beyond the end of the soft needle tube 2. The puncture needle 3 is detachably connected to the needle seat 1 and the soft needle tube 2. The injection component 4 is connected to the side of the needle seat 1 and is used to deliver medication into the cavity of the needle seat 1. The soft needle tube 2 includes a first needle tube segment 5 and a second needle tube segment 6. The first needle tube segment 5 is connected to the needle seat 1. A baffle 7 is connected to the second needle tube segment 6. A fitting gap is provided between the baffle 7 and the end of the second needle tube segment 6. The baffle 7 is made of rubber material. The puncture hard needle 3 passes through the baffle 7. A sealing valve block 9 is provided inside the second needle tube section 6. The length of the sealing valve block 9 is greater than the width of the fitting gap between the baffle 7 and the end of the second needle tube section 6. When the second needle tube section 6 is under positive pressure, the sealing valve block 9 is open; when the second needle tube section 6 is under negative pressure, the sealing valve block 9 is closed. The sealing valve block 9 and the second needle tube section 6 have a first mating state and a second mating state. In the first engagement state, the sealing valve block 9 is located inside the second needle tube section 6; When the positive pressure in the second needle tube section 6 reaches the set value, the sealing valve block 9 slides along the second needle tube section 6. When the sealing valve block 9 is located in the fitting gap between the second needle tube section 6 and the baffle 7, the two form a second fitting state, and the sealing valve block 9 is in the closed state in the second fitting state.

[0027] By employing the anti-backflow indwelling needle described in this invention, a strong pulse jet is generated within the needle seat 1 and the soft needle tube 2 during the sealing operation by injecting sealing fluid using a pulse method. Under the impetus of the pulse jet, the sealing valve block 9 can slide to the mating gap between the second needle tube section 6 and the baffle 7, sealing the end opening of the second needle tube section 6. This effectively prevents blood backflow from causing blockage of the soft needle tube 2, thus improving the practicality of this invention in actual use.

[0028] Specifically, in this embodiment, the sealing valve block 9 is provided with a one-way valve. When the second needle tube section 6 is under positive pressure, the one-way valve opens; when the second needle tube section 6 is under negative pressure, the one-way valve closes. When administering medication via an indwelling needle, the sealing valve block 9 and the second needle tube segment 6 are in a first engagement state. After the medication infusion is completed, a sealing fluid is injected using a pulse method to push the sealing valve block 9 to the engagement gap between the second needle tube segment 6 and the baffle 7, forming a second engagement state. At this time, the end opening of the second needle tube segment 6 is closed, preventing blood from flowing back into the soft needle tube 2 and causing blockage. When medication needs to be infused again, a negative pressure environment is created in the soft needle tube 2 by aspiration with a syringe. At this time, the sealing valve block 9 closes, and under the action of negative pressure suction, the sealing valve block 9 slides into the second needle tube segment 6, and the two revert to the first engagement state.

[0029] As a preferred embodiment, based on the above method, the inner diameter of the first needle segment 5 is further larger than the inner diameter of the second needle segment 6. This structural arrangement allows for a faster flow rate of the sealing fluid entering the second needle segment 6, resulting in a greater positive pressure applied to the sealing valve block 9. Consequently, the sealing valve block 9 can slide more smoothly within the second needle segment 6, further improving the practicality of this invention in actual use.

[0030] As a preferred embodiment, based on the above method, the junction of the first needle segment 5 and the second needle segment 6 is further configured as a flared structure. This structural design makes the junction of the first needle segment 5 and the second needle segment 6 smoother, reducing energy loss during the passage of the sealing fluid, and further increasing the positive pressure applied to the sealing valve block 9, ensuring the smooth sliding of the sealing valve block 9 within the second needle segment 6.

[0031] As a preferred embodiment, based on the above method, a ring plate 10 is further provided inside the second needle tube section 6. The ring plate 10 is used to prevent the sealing valve block 9 from entering the first needle tube section 5. This structural arrangement further improves the practicality of this invention in actual use.

[0032] Example 2 like Figures 1 to 3 As shown, the anti-backflow indwelling needle of this utility model, based on the above-mentioned method, further features a planar structure on the surface of the needle hub 1 that contacts the human skin. This structural design increases the contact area between the needle hub 1 and the human skin, reducing the risk of the needle hub 1 injuring the skin during actual use.

[0033] As a preferred embodiment, based on the above method, the injection component 4 further includes an extension tube 11 and a three-way connector 12. The extension tube 11 is connected to the needle seat 1, and a fixing seat 13 is provided on the extension tube 11 to create a gap between the extension tube 11 and the human skin. This structural arrangement reduces the risk of the extension tube 11 injuring the human skin, thereby further improving the practicality of this invention in actual use.

[0034] As a preferred embodiment, based on the above method, the side of the fixing seat 13 that contacts the human skin is adhesive. This structural design improves the stability of the fixing seat 13 in contact with the human skin; furthermore, the fixing seat 13 can reinforce the extension tube 11, thereby further enhancing the practicality of this invention in actual use.

[0035] As a preferred embodiment, based on the above method, the fixing base 13 and the extension tube 11 are further slidably connected. This structural arrangement allows for adjustment of the position of the fixing base 13 on the extension tube 11, thus avoiding conflicts between the fixing base 13 and other medical devices in practical applications, thereby further improving the practicality of this invention in actual use.

[0036] As a preferred embodiment, based on the above method, the fixing base 13 is further provided with a strap 14 for connecting to a human limb. This structural arrangement improves the stability of fixing the extension tube 11.

[0037] Example 3 like Figure 1 As shown, the anti-backflow indwelling needle of this utility model, based on the above method, further includes a needle body 15 and a wing plate 16 in the puncture hard needle 3. When the needle body 15 is inserted into the internal cavity of the needle seat 1 and the soft needle tube 2, the wing plate 16 is formed on the side of the needle seat 1.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An anti-backflow indwelling needle, characterized in that, The device includes a needle hub, a soft needle tube, a puncture needle, and an injection component. The needle hub has a receiving cavity. The central axis of the soft needle tube coincides with the central axis of the needle hub and communicates with the receiving cavity of the needle hub. A sealing rubber is provided at one end of the needle hub relative to the soft needle tube. The puncture needle passes through the sealing rubber and into the receiving cavity of the needle hub, with its end extending beyond the end of the soft needle tube. The puncture needle is detachably connected to the needle hub and the soft needle tube. The injection component is connected to the side of the needle hub and is used to deliver medication into the cavity of the needle hub. The soft needle tube includes a first needle tube segment and a second needle tube segment. The first needle tube segment is connected to the needle hub. A baffle is connected to the second needle tube segment. A fitting gap is provided between the baffle and the end of the second needle tube segment. The baffle is made of rubber material. The puncture needle passes through the baffle. A sealing valve block is provided inside the second needle tube section. The length of the sealing valve block is greater than the width of the fitting gap between the baffle and the end of the second needle tube section. When the second needle tube section is under positive pressure, the sealing valve block is open; when the second needle tube section is under negative pressure, the sealing valve block is closed. The sealing valve block and the second needle tube section have a first mating state and a second mating state. In the first engagement state, the sealing valve block is located inside the second needle tube section; When the positive pressure in the second needle tube section reaches the set value, the sealing valve block slides along the second needle tube section. When the sealing valve block is located in the fitting gap between the second needle tube section and the baffle, the two form a second fitting state, and the sealing valve block is in the closed state in the second fitting state.

2. The anti-backflow indwelling needle according to claim 1, characterized in that, The inner diameter of the first needle segment is larger than the inner diameter of the second needle segment.

3. The anti-backflow indwelling needle according to claim 2, characterized in that, The junction between the first needle segment and the second needle segment is designed with a flared opening structure.

4. The anti-backflow indwelling needle according to claim 1, characterized in that, The second needle tube section is provided with a ring plate, which is used to prevent the sealing valve block from entering the first needle tube section.

5. The anti-backflow indwelling needle according to claim 1, characterized in that, The surface of the needle hub that contacts human skin is designed as a planar structure.

6. The anti-backflow indwelling needle according to claim 1, characterized in that, The injection component includes an extension tube and a three-way connector. The extension tube is connected to the needle hub. A fixing seat is provided on the extension tube, and the fixing seat is used to create a gap between the extension tube and the human skin.

7. The anti-backflow indwelling needle according to claim 6, characterized in that, The side of the mounting base that contacts human skin is adhesive.

8. The anti-backflow indwelling needle according to claim 7, characterized in that, The fixed base and the extension tube are slidably connected.

9. The anti-backflow indwelling needle according to claim 8, characterized in that, The mounting base is also equipped with straps for connecting to human limbs.

10. The anti-backflow indwelling needle according to claim 1, characterized in that, The puncture needle includes a needle body and a wing plate. When the needle body is inserted into the needle seat and the internal cavity of the soft needle tube, the wing plate is formed on the side of the needle seat.

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