Repeated quantitative injector

Abstract

The invention relates to a multi-time quantitative injector which comprises a tube body. A piston capable of moving up and down is arranged in the medicine bottle; the lower end of the piston rod is inserted into the medicine bottle and located above the piston, a plurality of positioning grooves are formed in the peripheral wall of the piston rod at intervals in the length direction of the piston rod, and the positioning grooves extend in the circumferential direction of the piston rod; a plurality of connecting grooves are further formed in the peripheral wall of the piston rod, and every two axially adjacent positioning grooves communicate with each other through one connecting groove; the injection rod is installed in the tube body, located above the medicine bottle and arranged on the piston rod in a sleeving mode, the injection rod can rotate in the circumferential direction relative to the piston rod and can move upwards relative to the piston rod, and positioning blocks are arranged on the inner circumferential wall of the injection rod and can sequentially slide into the positioning grooves from bottom to top along the connecting grooves. And the positioning blocks can be limited in the corresponding positioning grooves in the vertical direction. In the whole process, the force for driving the injection rod to move downwards is completely manpower and does not depend on a spring, the injection precision is high, and it is guaranteed that the injection dosage is accurate every time.

Description

technical field [0001] The invention relates to the technical field of medical appliances, in particular to a multiple-time quantitative syringe. Background technique [0002] The multi-injection syringe is a drug injection device that can divide the drug liquid in the drug bottle into multiple injections into the user's body. Since the multi-injection syringe can be used multiple times, it can better meet the needs of patients. For example, diabetic patients generally need long-term insulin injections to control the disease, and the amount of each injection is not large. If you use a small syringe at a time, it will cause waste. In order to avoid waste and reduce the cost of use, a large syringe can be used to inject in batches. [0003] For example, the Chinese invention patent application with patent number CN202110561355.8 (publication number CN113384776A) discloses "a drug injection device for multiple injections", which includes a casing, a plunger rod axially slida...

AI Technical Summary

Problems solved by technology

[0004] The plunger rod of this patent (equivalent to the piston rod below) needs to move towards the front end under the action of the drive spring for injection, but if the spring ages after repeated use, the injection accuracy will not be high, which will lead to poor injection accuracy. Inaccurate dose control, affecting the therapeutic effect

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