CN203915669U - Compound syringe - Google Patents

Abstract

The utility model discloses a composite syringe, which comprises a casing and a core rod set in the casing. The front end of the core rod is connected with a piston B. The inner wall of the jacket forms a chamber A for containing the solution, and the piston A, the piston B and the inner wall of the jacket form a chamber B for containing the solution. A steel needle is arranged in the cone head, and the needle point of the steel needle faces the piston A. After injecting the liquid in the A chamber, the steel needle penetrates the piston A to continue to inject the liquid in the B chamber, so as to achieve the purpose of sequentially injecting two different liquids with one syringe.

Description

compound syringe

technical field

The utility model relates to a syringe, in particular to a composite syringe for giving two different medicines in succession at one time.

Background technique

Intravenous catheters are a commonly used treatment device, the setting of intravenous catheters can facilitate treatment, for example, drugs can be infused into the human body through intravenous catheters, and these catheters need to be flushed to keep the catheter open and intact, the fluid for flushing the catheter, there is injection of saline Aqueous solution, heparin, etc. For patients who receive infusions the next day, just flushing the catheter with saline injection may still cause blood coagulation and blockage of the catheter, and if heparin solution is used to flush and seal the catheter, the heparin content infused into the human body may be too high, resulting in adverse effects. Therefore, it is best to flush the catheter with saline injection during the nursing process, and then seal the catheter with heparin solution. If the above operation is adopted, two syringes need to be used, which will increase the workload of the medical staff and increase unnecessary contamination risks during the operation.

Contents of the invention

The purpose of the utility model is to provide a composite syringe, which can realize sequential injection of two different injection solutions, and can be used for flushing and sealing venous catheters to improve efficiency and reduce contamination risks.

The utility model is achieved in the following way: a composite syringe, comprising a casing and a core rod set in the casing, the front end of the core rod is connected with a piston B, and a piston A is arranged between the piston B and the cone head at the front end of the casing, and the piston A A chamber containing the solution is formed with the inner wall of the jacket, and the piston A, piston B and the inner wall of the jacket form the B chamber containing the solution. A steel needle is arranged in the cone head, and the needle point of the steel needle faces the piston A.

Said injection saline solution is encapsulated in the chamber A, and heparin solution is encapsulated in the chamber B.

The pinhole of the steel needle is opened at the needle tip, and the root of the steel needle is provided with a small hole.

The front end of the coat is provided with a protective cap.

The beneficial effect of the utility model is that two different liquids can be packaged in the same syringe, and after injecting the liquid in the A chamber, the steel needle penetrates the piston A and can continue to inject the liquid in the B chamber, thereby realizing the use of one syringe The purpose of sequentially injecting two different liquids. The syringe has a simple structure and is convenient to use, improves the efficiency of medical staff, and effectively reduces the risk of contamination.

Description of drawings

Fig. 1 is the structural representation of the utility model disposable composite syringe;

Fig. 2 is a schematic view of the steel needle structure;

Fig. 3 is a schematic diagram when the liquid in the chamber A is injected;

Figure 4 is a partial enlarged view of steel needle puncture piston A

In the figure: 1, protective cap; 2, steel needle; 3, chamber A; 4, piston A; 5, chamber B; 6, jacket; 7, piston B; 8, core rod; 9 cone head; 21, Pinhole; 22 small holes.

Detailed ways

It can be seen from Fig. 1 and Fig. 3 that the composite syringe of the present invention includes an outer casing 6 and a core rod 8 sleeved in the outer casing 6, the front end of the core rod 8 is connected with a piston B7, and the piston B7 is connected with the front end cone 9 of the outer casing. Piston A4 is arranged between, piston A4 and the inner wall of overcoat 6 form the A chamber 3 that holds solution, piston A4, piston B7 and the inner wall of overcoat 6 form B chamber 5 that holds solution, and described conical head 9 is provided with hollow steel Needle 2, the tip of steel needle 2 faces piston A4. The pinhole 21 of the steel needle is opened at the needle tip, and the steel needle 2 roots are provided with small holes 22 . The front end of the coat 6 is provided with a protective cap 1 . When using the utility model to nurse the venous catheter, the injection saline solution is packaged in the chamber A, and the heparin solution is packaged in the chamber B.

When in use, when the core rod 8 and the piston B7 are pushed toward the cone head 9 as a whole, the piston A is also pushed toward the cone head 9 under the thrust of the solution in the B chamber 5, so that the liquid in the A chamber 3 Under the action of the piston A4, it moves toward the cone head and injects it out through the steel needle hole 21. As the liquid solution in the chamber A 3 in the syringe decreases continuously, when the piston A4 moves to contact with the needle tip of the steel needle 2, the core The whole composed of the rod 8 and the piston B7 continues to push the liquid in the B chamber 5 to the direction of the cone head under the action of the external force, and the liquid in the B chamber 5 pushes the piston A4 to move to the direction of the cone head 9. Since the tip of the steel needle is very sharp, Under the action of force, the piston A4 is penetrated, and the liquid in the B chamber 5 is injected through the steel needle 2 when it is completely penetrated. The top of the steel needle 2 is provided with a pinhole 21, and several small holes 22 are arranged on the steel needle. The sharp needle point is easy to puncture, and the small holes are easy to inject the remaining solution smoothly. Using one syringe to inject two fluids reduces the workload of medical staff and also reduces the risk of unnecessary bacterial infection during the operation.

Claims (4)

1. Composite syringe, including a jacket and a core rod set in the jacket. The front end of the core rod is connected to a piston B. It is characterized in that: a piston A is arranged between the piston B and the cone head at the front end of the jacket, and the piston A forms a shape with the inner wall of the jacket. Chamber A for containing the solution, piston A, piston B and the inner wall of the jacket form a chamber B for containing the solution, a steel needle is arranged in the cone head, and the needle point of the steel needle faces the piston A. 2. The compound syringe according to claim 1, characterized in that: said chamber A is packed with saline solution for injection, and chamber B is packed with heparin solution. 3. The composite syringe according to claim 1, characterized in that: the needle hole of the steel needle is opened at the needle tip, and a small hole is provided at the root of the steel needle. 4. The composite syringe according to claim 1, wherein a protective cap is provided at the front end of the casing.