Emptying type syringe

Abstract

The invention relates to an emptying type syringe. The emptying type syringe comprises a needle cylinder, a syringe needle and a main piston rod; a needle cylinder nipple used for installing the syringe needle is arranged at the front end of the syringe needle, a main temporary containing cavity of temporary containing liquid medicine is arranged inside the needle cylinder, and the main piston rod is composed of a main piston moving in the main temporary containing cavity in a sealed and sliding mode and a main rod body driving the main piston to move; the emptying type syringe further comprises an auxiliary piston rod, the main rod body is internally provided with an auxiliary temporary containing cavity, an auxiliary piston rod is composed of an auxiliary piston moving in an auxiliary temporary containing cavity in a sealed and sliding mode and an auxiliary rod body driving the auxiliary piston to move, a first communication opening communicated with the auxiliary temporary containing cavity is formed in the main rod body installed at the end of the main piston, a second communication opening communicated with a main temporary containing cavity is formed in the main piston rotatably arranged at the end of the main rod body, the main temporary containing cavity is internally provided with a limiting part limiting the main piston to perform circumferential rotation, and when a first communication opening is opposite to a second communication opening, the main temporary containing cavity is communicated with the auxiliary temporary containing cavity. According to the scheme, the emptying type syringe can inject the liquid medicine completely and is provided with the replaceable syringe needle.

Description

technical field [0001] The invention relates to a disposable syringe, in particular to an emptying syringe. Background technique [0002] Disposable syringes are currently one of the most widely used devices in medical institutions. Because they can effectively reduce the occurrence of cross-infection during injections, they are the most common items in nursing work. With the progress of the medical industry, a new generation of syringes such as self-destructing safety syringes, needle-free syringes, retractable syringes, and pre-disposable syringes have been launched one after another. [0003] A traditional disposable syringe includes a syringe, a needle and a piston rod. There is a temporary chamber for temporarily storing the liquid medicine in the syringe. The piston rod is composed of a piston that slides in the temporary chamber and a rod that drives the piston. There is a syringe nipple for installing the needle. When in use, the rod body drives the piston to move t...

AI Technical Summary

Problems solved by technology

However, although disposable syringes are widely used in clinical practice, due to the dead space at the nipple of the syringe and the front end of the temporary cavity, the drug cannot be completely emptied, resulting in waste of drugs, especially the non-empty injection of special expensive drugs, which is not only obvious Affect its curative effect, and increase the financial burden of patients

[0004] In order to solve the above problems, a non-dead space syringe has been developed. The needle and the barrel of the syringe are integrated, thus canceling the barrel nipple for installing the needle, so the dead space formed by the barrel nipple no longer exists. Thereby solving the problem of drug waste and injection dose deviation caused by the dead space, but this syringe still has the following disadvantages: ① the needle cannot be replaced, resulting in a limited application range of a single syringe; ② this type of syringe can only inject small doses of drugs, such as insulin, Skin test, etc.; ③There is still a dead space between the front end of the temporary chamber and the piston, and this part of the dead space cannot be avoided

[0005] In order to solve the above problems, an improved suction method suitable for ordinary syringes has been developed. Before the syringe pumps the liquid medicine, the air is pre-sucked, and this part of the air is kept in the syringe during injection, so that the liquid medicine can be absorbed. Completely excluded, but this kind of suction method is difficult, and the suction results are highly accidental. Since air cannot be injected into the body in most cases, it is not suitable for intravenous injection, and medical accidents are prone to occur.

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