Multiple Injection Syringe with Retractable Needle and Assisted Needle Actuation for Injection and Return: A Patent

This paper describes a patented multi-injection syringe system which presents a retractable hypodermic needle with assisted actuation to minimize the risk of needlestick injuries and disease transmission. The objective is achieved through a user-friendly mechanism that ensures safe needle retraction after each injection. The mechanism consists of at least one spring and one flexural spring that provide assisted needle movement and secure locking in multiple positions. The invented system can be applied in various medical fields and offers a safer alternative to conventional syringes, as it effectively addresses critical biological hazards in clinical operations.