Pressure changing device and infusion connector

Abstract

A pressure changing device and an infusion connector are provided. The pressure changing device includes a pressure changing member. When the pressure changing device is connected to an infusion head or a syringe head, a negative pressure is generated in the pressure changing device, which draws thrombus from a connected indwelling needle into an indwelling needle holder or the pressure changing device, thereby preventing the thrombus from re-entering the blood vessel of a patient through the indwelling needle. Then the negative pressure disappears, and liquid can flow into the blood vessel normally through the indwelling needle. When removing the infusion head or the syringe head, the pressure changing device generates a positive pressure for a certain period of time, pushing the liquid in the indwelling needle into the blood vessel, thereby avoiding blood reflux and reducing the formation of thrombus in the indwelling needle.

Dependencies are inferred from the claim text.