A needle for intravenous infusion

Abstract

The utility model relates to the technical field of indwelling needle, specifically, it is an indwining needle for preventing blood backflow, which comprises an indwelling needle body and a positive pressure connector connected with the indwelling needle body through a hose, the end of the positive pressure connector is fixedly installed with a non-return cylinder, the inner wall of the non-return cylinder is fixedly installed with an annular seat, a lower conical chamber, a through hole and an upper conical chamber are sequentially arranged in the annular seat from bottom to top, the lower conical chamber, the through hole and the upper conical chamber are communicated with each other, a plugging ball is arranged in the upper conical chamber, an elastic filter screen is arranged above the upper conical chamber, the elastic filter screen is fixedly installed on the inner wall of the non-return cylinder, the inner side of the elastic filter screen abuts against the plugging ball, an ejection tube is inserted and matched in the through hole, an external infusion tube is fixedly installed at the lower end of the ejection tube, a plurality of overflow holes are arranged on the upper end of the ejection tube. The utility model has the function of preventing blood backflow and ensures the safety of infusion.

Description

Technical Field

[0001] This utility model relates to the field of indwelling needle technology, specifically to an indwelling needle that prevents blood backflow. Background Technology

[0002] Indwelling needles are a commonly used medical device, widely used in various infusion therapy, blood collection, and intensive care scenarios. With advantages such as reducing the pain of repeated punctures for patients, reducing the workload of medical staff, and ensuring the continuity of treatment, indwelling needles have greatly improved the convenience and effectiveness of clinical treatment. However, in actual use, the problem of blood backflow seriously affects the effectiveness of indwelling needles and even poses a potential threat to the health of patients.

[0003] On the one hand, existing indwelling needles have inherent design flaws, making it difficult to effectively cope with changes in intravascular pressure. When the infusion ends and the infusion device is disconnected, blood will flow backward along the lumen of the indwelling needle. This backflow of blood not only causes blood to coagulate inside the needle, resulting in blockage and hindering the smooth progress of subsequent infusion treatment, but also significantly increases the workload of medical staff in clearing the needle or re-puncturing, and causes additional pain to the patient. Long-term blockage may even lead to thrombosis. Once the thrombus breaks off, it can enter the lungs or other vital organs through the blood circulation, which can easily cause serious complications such as pulmonary embolism, endangering the patient's life. Although some indwelling needles use a single-handed clamp to control the opening and closing of the tubing, which can prevent blood from flowing out after the infusion ends, it requires manual operation, is not timely, and if the single-handed clamp is forgotten to be closed, blood will still flow out.

[0004] On the other hand, some indwelling needles designed to address blood reflux employ complex one-way valves or pressure regulating devices. These devices not only significantly increase the manufacturing cost of the indwelling needles, leading to higher medical expenses and a heavier financial burden on patients, but also complicate the structure of the indwelling needles, significantly increasing the difficulty of operation and placing higher demands on the professional skills and operational experience of medical personnel, thus limiting their widespread application in clinical practice. Therefore, we propose an indwelling needle to prevent blood reflux. Utility Model Content

[0005] The purpose of this invention is to provide an indwelling needle that prevents blood backflow, thereby addressing the deficiencies mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An indwelling needle for preventing blood backflow includes an indwelling needle body and a positive pressure connector connected to the indwelling needle body via a flexible tube. A check valve is fixedly installed at the end of the positive pressure connector. An annular seat is fixedly installed on the inner wall of the check valve. From bottom to top, the annular seat contains a lower conical chamber, a through hole, and an upper conical chamber, which are interconnected. A sealing ball is installed in the upper conical chamber. An elastic filter is installed above the upper conical chamber and fixedly installed on the inner wall of the check valve. The inner surface of the elastic filter abuts against the sealing ball. An ejector tube is inserted into the through hole. An external infusion tube is fixedly installed at the lower end of the ejector tube. Multiple overflow holes arranged in a ring at equal intervals are provided on the upper end of the ejector tube.

[0008] Preferably, the length of the hose is between 8cm and 15cm, and the hose is equipped with a single-hand clamp.

[0009] Preferably, a lower chamber is provided below the annular seat, and an upper chamber is provided above the annular seat.

[0010] Preferably, the diameter of the sealing ball is larger than the diameter of the through hole, and the upper conical chamber is funnel-shaped.

[0011] Preferably, the lower conical chamber is frustum-shaped, and the size of the ejector tube is adapted to the size of the through hole.

[0012] Preferably, when the ejector tube is pulled out of the through hole, the elastic filter screen presses the lower half of the sealing ball against the upper end opening of the through hole. After the ejector tube is inserted into the through hole, the ejector tube pushes the sealing ball upward from the upper end opening of the through hole.

[0013] Preferably, a reinforcing annular side is fixedly installed between the top surface of the elastic filter and the check valve cylinder, and an end is fixedly installed on the external infusion tube, the end abutting against the end of the check valve cylinder.

[0014] Preferably, a connector is fixedly installed on the upper surface of the end, and the connector is inserted into the lower chamber.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model achieves precise anti-backflow function by setting a positive pressure connector and a check valve, combined with the lower conical chamber, through hole, and upper conical chamber in the annular seat, as well as the sealing ball and elastic filter screen. When the external infusion tube is pulled out from the through hole, the elastic filter screen presses the sealing ball against the upper end of the through hole to prevent blood backflow. When the tube is inserted, it lifts the sealing ball, allowing the liquid to flow smoothly. This achieves continuity in infusion and anti-backflow operation, eliminating the need for manual operation and effectively preventing blood backflow, ensuring a smooth infusion process.

[0017] 2. This utility model, through its elastic filter screen, not only limits the position of the sealing ball but also filters out tiny impurities in the liquid, ensuring the safety of infusion.

[0018] 3. This utility model enhances the stability of the overall structure and ensures the reliability of the anti-reverse function by fixing the elastic filter screen with a reinforced annular side. At the same time, the dimensions of each component are compatible with each other, enabling the device to better adapt to infusion scenarios. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This utility model Figure 1 Enlarged view of point A in the middle;

[0021] Figure 3 This is a cross-sectional view of the anti-reverse cylinder of this utility model;

[0022] Figure 4 This is a partial structural schematic diagram of the present invention;

[0023] The meanings of the labels in the diagram are as follows:

[0024] 1. Indwelling needle body; 10. Tube; 11. Positive pressure connector; 12. One-handed clamp;

[0025] 2. Check valve; 20. Annular seat; 201. Lower conical chamber; 202. Through hole; 203. Upper conical chamber; 21. Upper chamber; 22. Lower chamber; 23. Elastic filter screen; 231. Reinforced annular side; 24. Sealing ball;

[0026] 3. External infusion tube; 30. End; 31. Connector; 32. Outlet tube; 33. Overflow hole. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figures 1-4 This utility model provides a technical solution: an indwelling needle for preventing blood backflow, comprising an indwelling needle body 1 and a positive pressure connector 11 connected to the indwelling needle body 1 via a flexible tube 10. A check valve 2 is fixedly installed at the end of the positive pressure connector 11. An annular seat 20 is fixedly installed on the inner wall of the check valve 2. The annular seat 20 contains, from bottom to top, a lower conical chamber 201, a through hole 202, and an upper conical chamber 203, which are interconnected. A sealing ball 24 is installed inside the upper conical chamber 203, and an elastic filter 23 is installed above the upper conical chamber 203. The filter screen 23 is fixedly installed on the inner wall of the anti-backflow cylinder 2. The inner side of the elastic filter screen 23 abuts against the blocking ball 24. An ejector tube 32 is inserted into the through hole 202. An external infusion tube 3 is fixedly installed at the lower end of the ejector tube 32. When the ejector tube 32 is pulled out from the through hole 202, the elastic filter screen 23 presses the lower half of the blocking ball 24 against the upper end of the through hole 202, effectively preventing blood backflow. After the ejector tube 32 is inserted into the through hole 202, the ejector tube 32 pushes the blocking ball 24 upward from the upper end of the through hole 202, realizing a stable and reliable anti-backflow function, ensuring infusion safety, and reducing the risk of thrombosis.

[0029] In this embodiment, the upper end of the ejector tube 32 is provided with a plurality of overflow holes 33 arranged in a ring at equal intervals. Through the overflow holes 33, even when the top opening of the ejector tube 32 is blocked by the blocking ball 24, the medicine can still flow out normally through the overflow holes 33, so as to ensure that the infusion operation is carried out normally.

[0030] Specifically, the length of the tubing 10 is between 8cm and 15cm, which provides suitable operating space for medical staff and avoids tangling due to excessive length. The tubing 10 is equipped with a single-hand clamp 12, which allows medical staff to easily control the infusion with one hand, greatly simplifying the operation process, improving operating efficiency, and reducing the workload of medical staff.

[0031] Specifically, a lower chamber 22 is provided below the annular seat 20, and an upper chamber 21 is provided above the annular seat 20, providing reasonable installation space for each component and optimizing the overall layout.

[0032] Furthermore, the diameter of the plugging ball 24 is larger than the diameter of the through hole 202, the upper conical chamber 203 is funnel-shaped, the lower conical chamber 201 is frustum-shaped, and the size of the ejector tube 32 is matched with the size of the through hole 202, ensuring precise matching between the components and enabling the anti-backflow mechanism to operate stably.

[0033] In addition, a reinforced annular side 231 is fixedly installed between the top surface of the elastic filter 23 and the check cylinder 2, which enhances the stability of the connection between the elastic filter 23 and the check cylinder 2, making the elastic filter 23 less likely to fall off and extending its service life; an end 30 is fixedly installed on the external infusion tube 3, which abuts against the end of the check cylinder 2 for subsequent normal pull-out operation.

[0034] It is worth noting that a connector 31 is fixedly installed on the upper surface of the end 30. The connector 31 is inserted into the lower chamber 22 and is also interference-fitted with the lower chamber 22 to increase friction and prevent it from falling off. After the ejector tube 32 is inserted through the through hole 202, the elastic deformation force of the elastic filter 23 is less than the friction between the ejector tube 32 and the through hole 202, and between the connector 31 and the lower chamber 22, so that the ejector tube 32 will not be pushed outward by the elastic filter 23 and fall off.

[0035] It is worth noting that while the elastic filter 23 serves to limit and block the ball 24, it can also filter larger impurities in the liquid medicine, achieving a filtration effect. Specifically, the elastic filter 23 can be made of medical-grade polyester fiber material. Polyester fiber has high mechanical strength and good wear resistance, so the elastic filter made from it is not easily damaged by friction or external force. It has good chemical stability and does not react with the liquid medicine. At the same time, it has good biocompatibility and meets the strict requirements of medical devices. In addition, polyester fiber can be woven or sintered to form a fine and uniform filter structure, effectively intercepting tiny impurities and preventing them from entering the human body.

[0036] When using the indwelling needle of this utility model to prevent blood backflow, the main body 1 of the indwelling needle is inserted into the patient's blood vessel. After successful puncture, the main body 1 of the indwelling needle is properly fixed.

[0037] Before infusion, insert the connector 31 of the external infusion tube 3 into the lower chamber 22 of the check cylinder 2. The interference fit between the connector 31 and the lower chamber 22 ensures a stable connection. At the same time, insert the ejector tube 32 into the through hole 202 of the annular seat 20. The ejector tube 32 pushes up the sealing ball 24 to release the blockage of the infusion channel.

[0038] During the infusion process, medical staff can control the flow of the infusion with one hand clamp 12. The medicine flows from the external infusion tube 3 through the overflow hole 33 of the ejector tube 32 into the check tube 2, and then into the indwelling needle body 1. If the sealing ball 24 accidentally blocks the top opening of the ejector tube 32, the overflow hole 33 can ensure that the medicine continues to flow out and maintain the normal infusion process.

[0039] After the infusion is completed, pull out the external infusion tube 3. The ejector tube 32 detaches from the through hole 202. The elastic filter 23 returns to its original state, which will cause the sealing ball 24 to return to its original state and press against the upper end of the through hole 202 to prevent blood backflow.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An indwelling needle for preventing blood backflow, comprising an indwelling needle body (1) and a positive pressure connector (11) connected to the indwelling needle body (1) via a tubing (10), characterized in that: A check cylinder (2) is fixedly installed at the end of the positive pressure connector (11). An annular seat (20) is fixedly installed on the inner wall of the check cylinder (2). The annular seat (20) is provided with a lower conical chamber (201), a through hole (202), and an upper conical chamber (203) from bottom to top. The lower conical chamber (201), the through hole (202), and the upper conical chamber (203) are interconnected. A sealing ball (24) is provided in the upper conical chamber (203). An elastic filter screen (23) is provided above the conical chamber (203). The elastic filter screen (23) is fixedly installed on the inner wall of the check cylinder (2). The inner side of the elastic filter screen (23) abuts against the sealing ball (24). An ejector tube (32) is inserted into the through hole (202). An external infusion tube (3) is fixedly installed at the lower end of the ejector tube (32). A plurality of overflow holes (33) arranged in a ring at equal intervals are provided on the upper end of the ejector tube (32).

2. The indwelling needle for preventing blood backflow according to claim 1, characterized in that: The length of the hose (10) is between 8cm and 15cm, and a single-hand clamp (12) is provided on the hose (10).

3. The indwelling needle for preventing blood backflow according to claim 1, characterized in that: A lower chamber (22) is provided below the annular seat (20), and an upper chamber (21) is provided above the annular seat (20).

4. The indwelling needle for preventing blood backflow according to claim 1, characterized in that: The diameter of the sealing ball (24) is larger than the diameter of the through hole (202), and the upper conical chamber (203) is funnel-shaped.

5. The indwelling needle for preventing blood backflow according to claim 1, characterized in that: The lower conical chamber (201) is frustum-shaped, and the size of the ejector tube (32) is adapted to the size of the through hole (202).

6. The indwelling needle for preventing blood backflow according to claim 1, characterized in that: When the ejector tube (32) is pulled out of the through hole (202), the elastic filter (23) presses the lower half of the sealing ball (24) against the upper end opening of the through hole (202). After the ejector tube (32) is inserted into the through hole (202), the ejector tube (32) pushes the sealing ball (24) upward from the upper end opening of the through hole (202).

7. The indwelling needle for preventing blood backflow according to claim 3, characterized in that: A reinforced annular side (231) is fixedly installed between the top surface of the elastic filter (23) and the check cylinder (2), and an end (30) is fixedly installed on the external infusion tube (3), with the end (30) abutting against the end of the check cylinder (2).

8. The indwelling needle for preventing blood backflow according to claim 7, characterized in that: A connector (31) is fixedly installed on the upper surface of the end (30), and the connector (31) is inserted into the lower chamber (22).

Images