A needle guard for a hypodermic needle

Abstract

The utility model discloses a kind of anti-puncture indwelling needle convenient to one-hand operation, including indwelling needle shell and indwelling needle needle core, infusion tube is equipped on the indwelling needle shell, positive pressure connector is connected with on infusion tube through extension tube, the upper end of the indwelling needle needle core is equipped with cover, the lateral wall of the indwelling needle shell is fixedly connected with first connecting block, cover is fixedly connected with second connecting block, it is connected between the second connecting block and first connecting block by connecting assembly, multiple valves located below infusion tube are equipped in the indwelling needle shell, sealing screen located above infusion tube is equipped in the indwelling needle shell.The utility model structure design is reasonable, pressure difference identification is carried out by MEMS piezoresistive sensor, determination of triggering into blood vessel is entered, can guarantee needle efficiency, the setting of connecting assembly is conducive to medical staff one-hand operation, and the risk that indwelling needle needle core can be reduced and medical staff are punctured.

Description

Technical Field

[0001] This utility model relates to the field of indwelling needle technology, and in particular to an indwelling needle that is easy to operate with one hand and prevents puncture wounds. Background Technology

[0002] An indwelling catheter, also known as a peripheral intravenous catheter, intravenous catheter, or cannula, is an infusion device. Its core components include a stainless steel guide needle and a flexible catheter that can be left in the blood vessel. During use, the catheter and the metal needle are inserted together into the blood vessel. Once the catheter is fully inside the vessel, the metal needle is withdrawn, leaving only the flexible catheter in the patient's blood vessel for intravenous infusion therapy.

[0003] Currently, the procedure for using indwelling needles involves: flushing the tubing with liquid, expelling air, inserting the needle and aspirating, observing blood through the thin tubing, mixing blood with the liquid, and then re-infusing blood. This process is cumbersome, especially during patient resuscitation, as it's crucial to confirm blood return. It's difficult to quickly determine if the tubing is within the blood vessel, delaying resuscitation time. Furthermore, inexperienced nurses often prick their hands with the needle when removing indwelling needles due to lack of experience, leading to infection. Therefore, we have designed a puncture-proof indwelling needle that is easy to operate with one hand to address these issues. Utility Model Content

[0004] The purpose of this invention is to solve the problems existing in the prior art and to propose an indwelling needle that is easy to operate with one hand and prevents punctures. It uses a MEMS piezoresistive sensor to identify pressure differences and trigger the determination of entry into the blood vessel, which can ensure the efficiency of needle insertion. The design of the connecting components is conducive to medical staff to operate with one hand and can reduce the risk of the indwelling needle core puncturing medical staff.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A puncture-resistant indwelling needle designed for easy one-handed operation includes an indwelling needle housing and an indwelling needle core. The indwelling needle housing has an infusion tube connected to it via an extension tube and a positive pressure connector. The upper end of the indwelling needle core has a cap. A first connecting block is fixedly connected to the side wall of the indwelling needle housing, and a second connecting block is fixedly connected to the cap. The second connecting block and the first connecting block are connected via a connecting assembly. The indwelling needle housing contains multiple valves located below the infusion tube, and a sealing screen is located above the infusion tube. A MEMS piezoresistive sensor is embedded at the tip of the indwelling needle core.

[0007] Preferably, the connecting assembly includes a connecting groove formed on the side wall of the first connecting block, a connecting slider adapted to it being slidably connected in the connecting groove, a spring connecting the connecting slider and the inner top of the connecting groove, a slot formed on the side wall of the connecting slider, and a locking block extending into the slot being fixedly connected to the side wall of the second connecting block.

[0008] Preferably, a protrusion is fixedly connected to the bottom of the first connecting block, and a limiting ring sleeved on the outside of the protrusion is fixedly connected to the side wall of the second connecting block.

[0009] Preferably, a pull block is fixedly connected to the side wall of the second connecting block.

[0010] Preferably, the indwelling needle housing is transparent, and the end of the indwelling needle core has a sharp bevel.

[0011] Preferably, the MEMS piezoresistive sensor is powered wirelessly and has a built-in Bluetooth Low Energy module for data transmission.

[0012] Compared with the prior art, the advantages of this utility model are as follows:

[0013] 1. This puncture-proof indwelling needle is easy to operate with one hand. The needle core is located inside the indwelling needle housing. When the indwelling needle housing is pushed into the infusion patient's blood vessel, the MEMS piezoresistive sensor identifies the pressure difference and triggers the determination that the needle has entered the blood vessel. This can quickly determine that the needle is in the blood vessel, thereby ensuring the efficiency of needle insertion.

[0014] 2. This puncture-proof indwelling needle is easy to operate with one hand. Pushing the limiting ring downwards causes it to disengage from the protrusion, and the spring pulls the connecting slider upwards, allowing the needle core to disengage from the soft catheter at the end of the indwelling needle housing without directly disengaging from the housing, thus avoiding injury to medical staff. This facilitates one-handed operation by medical staff. Pulling the pull block moves the locking block out of the connecting slider, allowing the needle core to be removed from the housing. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the external structure of a puncture-proof indwelling needle that is easy to operate with one hand, as proposed in this utility model.

[0016] Figure 2 This is a schematic diagram of the internal cross-sectional structure of an anti-puncture indwelling needle that is easy to operate with one hand, as proposed in this utility model.

[0017] Figure 3 for Figure 2 Enlarged view of the structure at point A in the middle.

[0018] In the diagram: 1. Indwelling needle housing; 2. Infusion tubing; 3. Extension tubing; 4. Cover; 5. Indwelling needle core; 6. MEMS piezoresistive sensor; 7. First connecting block; 8. Connecting groove; 9. Connecting slider; 10. Spring; 11. Second connecting block; 12. Locking block; 13. Pulling block; 14. Protrusion; 15. Limiting ring; 16. Valve; 17. Sealing screen. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] Reference Figures 1-3 A puncture-resistant indwelling needle designed for easy one-handed operation includes an indwelling needle housing 1 and an indwelling needle core 5. An infusion tube 2 is mounted on the indwelling needle housing 1, and a positive pressure connector is connected to the infusion tube 2 via an extension tube 3. A cover 4 is located at the upper end of the indwelling needle core 5, and the cover 4 has a lever for easy pulling. A first connecting block 7 is fixedly connected to the side wall of the indwelling needle housing 1, and a second connecting block 11 is fixedly connected to the cover 4. The second connecting block 11 and the first connecting block 7 are connected by a connecting assembly. The connecting assembly includes a connecting groove 8 formed on the side wall of the first connecting block 7, a matching connecting slider 9 slidably connected within the connecting groove 8, and a spring 10 connecting the connecting slider 9 to the inner top of the connecting groove 8. Spring 10 is a tension spring, which can pull the connecting slider 9 upward in its natural state, causing the second connecting block 11 to move the cover 4 upward and pull out the indwelling needle core 5 upward. The upper part of the connecting groove 8 is not through-hole, so that the connecting slider 9 will not fall out of the connecting groove 8, and thus the indwelling needle core 5 will not fall out of the indwelling needle housing 1 under the tension of spring 10. The side wall of the connecting slider 9 is provided with a slot, and the side wall of the second connecting block 11 is fixedly connected with a locking block 12 extending into the slot. The outer side wall of the locking block 12 and the inner side wall of the connecting slider 9 are provided with anti-slip texture, which can increase the friction between the locking block 12 and the connecting slider 9 and prevent the locking block 12 from falling out of the connecting slider 9 in its natural state.

[0021] The bottom of the first connecting block 7 is fixedly connected to a protrusion 14, and the side wall of the second connecting block 11 is fixedly connected to a limiting ring 15 sleeved on the outside of the protrusion 14. The limiting ring 15 is made of flexible material and can be pushed to disengage from the protrusion 14. When the limiting ring 15 is sleeved on the protrusion 14, it can pull and restrict the second connecting block 11, preventing the second connecting block 11 from moving upward.

[0022] A pull block 13 is fixedly connected to the side wall of the second connecting block 11. The pull block 13 is opposite to the locking block 12, which makes it easy to pull the second connecting block 11 to move the locking block 12 out of the connecting slider 9, thereby enabling the cover 4 and the indwelling needle core 5 to be removed.

[0023] The indwelling needle housing 1 has multiple valves 16 located below the infusion tube 2. When the indwelling needle core 5 is withdrawn, the multiple valves 16 can close to prevent blood from flowing back into the infusion tube 2, thereby effectively preventing blockage. The indwelling needle housing 1 has a sealing screen 17 located above the infusion tube 2. A MEMS piezoresistive sensor 6 is embedded at the tip of the indwelling needle core 5. The MEMS piezoresistive sensor 6 is powered by wireless induction and has a built-in Bluetooth low power module for data transmission. The MEMS piezoresistive sensor 6 identifies pressure differences. The subcutaneous tissue pressure is about 20-30 mmHg (affected by muscle tension and local edema), and the intravenous pressure is about 5-15 mmHg (the central venous pressure is even lower, about 2-8 mmHg). When the needle tip penetrates the blood vessel wall, the pressure sensor detects a sudden drop (typical drop >10 mmHg), triggering the determination that the needle has entered the blood vessel, which can quickly determine that the needle is in the blood vessel.

[0024] The indwelling needle housing 1 is transparent, allowing for rapid observation of blood return and confirmation of position after puncture. The tip of the indwelling needle core 5 has a sharp bevel, resulting in low puncture resistance and smoother needle insertion. The indwelling needle core 5 uses laser cutting technology to ensure the sharpness of the needle tip and reduce vascular damage.

[0025] The functional principle of this utility model can be explained through the following operation methods:

[0026] In this invention, the needle core 5 of the indwelling needle, which is easy to operate with one hand, is located inside the indwelling needle housing 1 during use. The indwelling needle housing 1 is pushed into the patient's blood vessel. The MEMS piezoresistive sensor 6 identifies the pressure difference, triggering a determination that the needle has entered the blood vessel. This quickly confirms that the needle is in the blood vessel, thus ensuring efficient needle insertion. The limiting ring 15 is pushed downwards to disengage from the protrusion 14. The spring 10 pulls the connecting slider 9 upwards, thereby connecting the second connecting block 11, the cover 4, and... The indwelling needle core 5 moves upward, causing it to dislodge from the soft catheter at the end of the indwelling needle housing 1. Since the connecting slider 9 will not dislodge from the connecting groove 8, the indwelling needle core 5 will not directly dislodge from the indwelling needle housing 1, thus avoiding injury to medical staff and facilitating one-handed operation. The indwelling needle housing 1 can be fixed to the back of the patient's hand with tape. Pulling the pull block 13 causes the locking block 12 to move out of the connecting slider 9, thereby allowing the cover 4 and the indwelling needle core 5 to be removed, completing the needle insertion.

[0027] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A puncture-resistant indwelling needle that is easy to operate with one hand, comprising an indwelling needle housing (1) and an indwelling needle core (5), characterized in that, The indwelling needle housing (1) is provided with an infusion tube (2), and the infusion tube (2) is connected to a positive pressure connector via an extension tube (3). The upper end of the indwelling needle core (5) is provided with a cover (4). The side wall of the indwelling needle housing (1) is fixedly connected with a first connecting block (7), and the cover (4) is fixedly connected with a second connecting block (11). The second connecting block (11) and the first connecting block (7) are connected by a connecting component. The indwelling needle housing (1) is provided with multiple valves (16) located below the infusion tube (2). The indwelling needle housing (1) is provided with a sealing screen (17) located above the infusion tube (2). The tip of the indwelling needle core (5) is embedded with a MEMS piezoresistive sensor (6).

2. The puncture-resistant indwelling needle for easy one-handed operation according to claim 1, characterized in that, The connecting assembly includes a connecting groove (8) formed on the side wall of the first connecting block (7), a connecting slider (9) adapted to it is slidably connected in the connecting groove (8), a spring (10) is connected between the connecting slider (9) and the inner top of the connecting groove (8), a slot is formed on the side wall of the connecting slider (9), and a locking block (12) extending into the slot is fixedly connected to the side wall of the second connecting block (11).

3. The puncture-resistant indwelling needle for easy one-handed operation according to claim 2, characterized in that, The bottom of the first connecting block (7) is fixedly connected to a protrusion (14), and the side wall of the second connecting block (11) is fixedly connected to a limiting ring (15) sleeved on the outside of the protrusion (14).

4. The puncture-resistant indwelling needle for easy one-handed operation according to claim 2, characterized in that, The second connecting block (11) has a pull block (13) fixedly connected to its side wall.

5. The puncture-resistant indwelling needle for easy one-handed operation according to claim 1, characterized in that, The indwelling needle housing (1) is transparent, and the end of the indwelling needle core (5) is a sharp bevel.

6. The puncture-resistant indwelling needle for easy one-handed operation according to claim 1, characterized in that, The MEMS piezoresistive sensor (6) is powered by wireless sensing and has a built-in Bluetooth Low Energy module for data transmission.

Images