Positive pressure injection needle

Abstract

The utility model discloses a positive pressure injection needle, and particularly relates to the technical field of injection needles, which comprises a confluence cylinder, a circulation cavity is arranged in the confluence cylinder, a sealing cover is arranged at the upper end of the confluence cylinder, a connecting nozzle is mounted at the lower end of the confluence cylinder, and an injection needle is mounted at the lower end of the connecting nozzle. According to the injection needle, the positive pressure state of an inner cavity is guaranteed through the check valves, the problems that most of the tail portions of existing injection needles are communicated with the atmosphere, the tail portions of the existing injection needles are not communicated with the atmosphere, and the tail portions of the existing injection needles are not communicated with the atmosphere are solved. At the moment when the needle point punctures into the varicose vein, blood in a blood vessel with higher pressure quickly flows back into the front end of the injection needle, and an operator needs to inject tissue glue after exhausting, so that the time is prolonged, and the problem that the blood and the tissue glue are easily solidified instantly is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection needles, in particular to a positive pressure injection needle. Background Technique

[0002] At present, the clinical treatment methods for GV bleeding include medical treatment, surgical treatment, transjugular intrahepatic portosystemic shunt, and endoscopic injection of tissue adhesive. Medical treatment is used as an adjunct to other treatment methods; surgical operations have large trauma, rebleeding is not repeatable, and patients are not easily accepted; the incidence of hepatic encephalopathy in TIPS surgery is 25% - 45%. Weighing the pros and cons, the endoscopic injection of tissue adhesive has obvious advantages and has been listed as the preferred method for emergency hemostasis and secondary prevention of GV bleeding. At present, the improved sandwich method combined with lauromacrogol has been widely used in clinical practice. Its emergency hemostasis rate and rebleeding rate are better than those of using lauromacrogol alone or the traditional sandwich method (combination of iodized oil and tissue adhesive), and it can reduce the dosage of tissue adhesive and reduce the treatment cost. It uses a 5 mL syringe to draw 0.5 - 1 mL of tissue adhesive and reserve 1 mL of air, and combines lauromacrogol and sodium chloride for treatment. During operation, 1 mL of air is continuously injected after injecting the tissue adhesive. After the air injection is completed, it is paused for 1 - 2 s, and then 0.9% sodium chloride is replaced. On the one hand, injecting air makes the tissue adhesive continuously injected into the blood vessel, reducing the time for needle clogging; on the other hand, injecting 10 mL of 0.9% sodium chloride ensures that the residual tissue adhesive is washed away before solidification, maintaining the patency of the injection needle.

[0003] However, most of the current designs of the tail of the injection needle are open to the atmosphere. At the moment when the needle tip pierces into the varicose vein, the blood in the blood vessel with higher pressure quickly flows back into the front end of the injection needle. The operator needs to exhaust the air before injecting the tissue glue, which not only prolongs the time, but also is more likely to cause instant coagulation with the tissue glue, seriously affecting the hemostasis effect. Therefore, we propose a positive pressure injection needle to solve the problems mentioned above. Content of the Utility Model

[0004] The purpose of the utility model is to provide a positive pressure injection needle to solve the problem that most of the current designs of the tail of the injection needle are open to the atmosphere. At the moment when the needle tip pierces into the varicose vein, the blood in the blood vessel with higher pressure quickly flows back into the front end of the injection needle. The operator needs to exhaust the air before injecting the tissue glue, which not only prolongs the time, but also is more likely to cause instant coagulation with the tissue glue, seriously affecting the hemostasis effect.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: A positive pressure injection needle, including a confluence cylinder, a flow cavity is arranged inside the confluence cylinder, a sealing cover is arranged at the upper end of the confluence cylinder, a connecting nozzle is installed at the lower end of the confluence cylinder, and an injection needle is installed at the lower end of the connecting nozzle.

[0006] Further included are:

[0007] A connecting seat, which is installed at the upper end of the cover, and there are three connecting seats. A check valve is installed at the upper end of the connecting seat, and a joint mechanism is installed at the upper end of the check valve;

[0008] An annular sealing member, which is installed on the inner wall of the check valve;

[0009] A spring piece, which is installed at the lower end of the joint mechanism. One end of the spring piece is installed with an arc-shaped valve block, and the arc-shaped valve block is arranged below the annular sealing member.

[0010] Preferably, the joint mechanism includes an infusion tube tapered joint and a limit seat. The infusion tube tapered joint is arranged at the middle position of the upper end of the limit seat, and the infusion tube tapered joint and the limit seat are integrally formed.

[0011] Preferably, a sealing ring is arranged on the outer wall of the infusion tube tapered joint.

[0012] Preferably, a syringe connection hole is arranged inside the infusion tube tapered joint.

[0013] Preferably, the outer wall of the lower end of the check valve and the inner wall of the connecting seat are threadedly connected through a thread mechanism.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] 1. By arranging a check valve in the connection mechanism of the infusion needle, during infusion, under the action of liquid pressure, the spring piece in the check valve can be pushed to stretch outwards, so that the arc-shaped valve block at the end of the spring piece is away from the annular sealing member, making the valve in a through state. After the infusion of the medicinal liquid is completed, the arc-shaped valve block can reset under the elastic action of the spring piece to block the valve body, so as to avoid the backflow of gas or liquid, and keep the inside of the check valve always in a positive pressure state, thereby preventing the occurrence of blood backflow leading to coagulation and blockage. This solves the problem that most of the existing injection needle tails are open to the atmosphere. At the moment when the tip of the needle pierces into the varicose vein, the blood in the blood vessel with higher pressure quickly flows back into the front end of the injection needle. The operator needs to exhaust the air before injecting the tissue glue, which not only prolongs the time, but also is more likely to cause instant coagulation with the tissue glue, seriously affecting the hemostasis effect.

[0016] 2. By arranging three groups of joint mechanisms on the injection needle, the injection needle can be connected to three groups of syringes or infusion tubes, so as to quickly complete the injection of three kinds of medicaments, meeting the medical needs of the improved sandwich method. While the traditional Y-shaped double-pass tube can only be sleeved with two syringes, in the improved sandwich method, the number of injections increases to three, so that the traditional Y-shaped injection needle needs to be independently equipped with another injection needle, resulting in a more cumbersome medical operation. Description of the Drawings

[0017] Figure 1 is the overall structural schematic diagram of the present utility model;

[0018] Figure 2 is the internal structural schematic diagram of the check valve of the present utility model;

[0019] Figure 3 is the internal structural schematic diagram of the manifold of the present utility model;

[0020] In the figure: 1, manifold; 2, cover; 3, connecting nozzle; 4, injection needle; 5, connecting seat; 6, check valve; 7, joint mechanism; 701, tapered joint of infusion tube; 702, sealing ring; 703, syringe connection hole; 704, limit seat; 8, elastic sheet; 9, arc valve block; 10, annular sealing member; 11, threaded mechanism; 12, flow cavity. Specific embodiments

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0022] Please refer to Figures 1-3 , an embodiment provided by the present utility model: A positive pressure injection needle includes a manifold 1. A flow cavity 12 is provided inside the manifold 1. A cover 2 is provided at the upper end of the manifold 1. A connecting nozzle 3 is installed at the lower end of the manifold 1. An injection needle 4 is installed at the lower end of the connecting nozzle 3;

[0023] It further includes:

[0024] A connecting seat 5, which is installed at the upper end of the cover 2, and there are three connecting seats 5. A check valve 6 is installed at the upper end of the connecting seat 5. A joint mechanism 7 is installed at the upper end of the check valve 6;

[0025] An annular sealing member 10, which is installed on the inner wall of the check valve 6;

[0026] An elastic sheet 8, which is installed at the lower end of the joint mechanism 7. One end of the elastic sheet 8 is installed with an arc valve block 9, and the arc valve block 9 is arranged below the annular sealing member 10.

[0027] Please refer to Figure 2 , the joint mechanism 7 includes a tapered joint 701 of the infusion tube and a limit seat 704. The tapered joint 701 of the infusion tube is arranged at the middle position of the upper end of the limit seat 704, and the tapered joint 701 of the infusion tube and the limit seat 704 are integrally formed. When the joint mechanism 7 of the injection needle needs to be connected to the infusion tube, the infusion tube can be sleeved on the tapered joint 701 of the infusion tube to realize the fixation of the infusion tube and the joint mechanism 7 for convenient subsequent infusion.

[0028] Please refer to Figure 2 , a sealing ring 702 is provided on the outer wall of the tapered joint 701 of the infusion tube. The sealing ring 702 is made of rubber material, which can improve the sealing performance of the connection when the tapered joint 701 of the infusion tube is sleeved with the infusion tube.

[0029] Please refer to Figure 2 , a syringe connection hole 703 is provided inside the tapered joint 701 of the infusion tube. When the joint mechanism 7 of the injection needle needs to be connected to a syringe, the injection head of the syringe can be inserted into the syringe connection hole 703 to fix the infusion tube to the joint mechanism 7.

[0030] Please refer to Figure 2 , the outer wall of the lower end of the check valve 6 and the inner wall of the connection seat 5 are threadedly connected through a threaded mechanism 11. Each check valve 6 is a thread-detachable structure, which can be independently replaced when damaged to save costs.

[0031] Working principle: Before use, the corresponding syringe or infusion tube can be connected to the joint mechanism 7 of the injection needle according to requirements. When the joint mechanism 7 of the injection needle needs to be connected to the infusion tube, the infusion tube can be sleeved on the tapered joint 701 of the infusion tube to realize the socket fixation of the infusion tube and the joint mechanism 7. When the joint mechanism 7 of the injection needle needs to be connected to a syringe, the injection head of the syringe can be inserted into the syringe connection hole 703 to realize the plug fixation of the infusion tube and the joint mechanism 7. After the infusion tube or syringe is connected, tissue adhesive, sodium chloride and lauromacrogol injection cavity are sequentially input into the check valve 6. During infusion, under the action of liquid pressure, the elastic piece 8 in the check valve 6 can be pushed to stretch outwards, so that the arc-shaped valve block 9 at the end of the elastic piece 8 is far away from the annular sealing member 10, making the valve in a through state. After the infusion of the liquid medicine is completed, the arc-shaped valve block 9 can reset under the elastic action of the elastic piece 8 to block the valve body to prevent gas or liquid from flowing back, so that the inside of the check valve 6 is always in a positive pressure state, thereby preventing the occurrence of blood backflow leading to coagulation and blockage.

[0032] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A positive pressure injection needle, comprising a confluence cylinder (1), an internal flow cavity (12) is arranged inside the confluence cylinder (1), a cover (2) is arranged at the upper end of the confluence cylinder (1), a connecting nozzle (3) is installed at the lower end of the confluence cylinder (1), and an injection needle (4) is installed at the lower end of the connecting nozzle (3); It is characterized in that: It further comprises: A connecting seat (5), which is installed at the upper end of the cover (2), and there are three connecting seats (5). A check valve (6) is installed at the upper end of the connecting seat (5), and a joint mechanism (7) is installed at the upper end of the check valve (6); An annular sealing member (10), which is installed on the inner wall of the check valve (6); A spring piece (8), which is installed at the lower end of the joint mechanism (7). One end of the spring piece (8) is installed with an arc-shaped valve block (9), and the arc-shaped valve block (9) is arranged below the annular sealing member (10).

2. The positive pressure injection needle according to claim 1, wherein: The joint mechanism (7) includes an infusion tube tapered joint (701) and a limit seat (704). The infusion tube tapered joint (701) is arranged at the middle position of the upper end of the limit seat (704), and the infusion tube tapered joint (701) and the limit seat (704) are integrally formed.

3. The positive pressure injection needle according to claim 2, characterized in that: A sealing ring (702) is arranged on the outer wall of the infusion tube tapered joint (701).

4. The positive pressure injection needle according to claim 2, wherein: A syringe connection hole (703) is arranged inside the infusion tube tapered joint (701).

5. The positive pressure injection needle according to claim 1, wherein: The outer wall of the lower end of the check valve (6) and the inner wall of the connecting seat (5) are threadedly connected through a thread mechanism (11).

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