Syringe adapter with a ball-typed valve

摘要

A syringe adapter with a ball-typed valve has a base, a dosing tube mounted around the base and a resilient valve mounted in the base and the dosing tube. The base has a guiding groove and an inner liquid channel communicating with each other, as well as an exhaust channel. Liquid medicine injected into the syringe adapter flows through the guiding groove and causes the inner liquid channel to be injected into a patient's body. The liquid medicine remaining in the split is cleaned when cleaning fluid is injected to clean the syringe adapter. Air in the syringe adapter flows out through the exhaust channel and is not injected into the patient's body, so the patient is free from pain. Furthermore, elements and assembling processes of the syringe adapter are simplified and manufacturing cost of the syringe adapter is lowered.

主权项

1. A syringe adapter comprising:
a base being tubular in shape and having a circular wall formed on and around the base and having an outer surface; an inner surface; a mounting recess defined in the circular wall; and a guiding groove formed in the outer surface of the circular wall; a bottom formed in the mounting recess and having an inner liquid channel formed transversely through the bottom and communicating with the guiding groove of the circular wall; and an exhaust channel formed through the base, communicating the mounting recess with an outside of the syringe adapter and not communicating with the inner liquid channel of the bottom; a dosing tube being tubular in shape, mounted securely around the outer surface of the circular wall of the base and having an injection tube protruding up from a top of the dosing tube and communicating with the mounting recess of the base; and a stop formed on an inner surface of the dosing tube adjacent to the top of the dosing tube; and a resilient valve formed integrally as a single part of the same material and mounted in the mounting recess of the base and the dosing tube, and the resilient valve having a positioning ring mounted on the bottom of the base, corresponding to the inner surface of the circular wall of the base and having an upper end selectively abutting the stop of the dosing tube; a bendable portion formed around the upper end of the positioning ring; a plunger formed on the bendable portion and protruding into the injection tube of the dosing tube; and an air chamber defined in the positioning ring, the bendable portion and the plunger and communicating with the exhaust channel of the base; wherein when the plunger of the resilient valve is pushed toward the base, the bendable portion and the plunger of the resilient valve are bent in the dosing tube and the positioning ring of the resilient valve is detached from the stop of the dosing tube.