INDWELLING NEEDLE FOR QUICK OBSERVATION OF BLOOD RETURN

摘要

An indwelling needle for quick observation of blood return. The key points of the composition thereof are that: a blood return cavity made of a transparent material and used for observing blood return is provided behind a barrier (1.4); a side hole (2.1.1) used for observing blood return on a needle tube (2.1) is located in the blood return cavity; the wall of the blood return cavity is provided with a vent plug, and the front and rear ends of the blood return cavity are provided with sealing rubber plugs (2.10, 2.11); a seal groove catheter (2.13) is provided behind the rear sealing rubber plug (2.11), and the front end face of the seal groove catheter (2.13) contacts the rear end face of the rear sealing rubber plug (2.11); the needle tube (2.1) fixed on a needle base (2.2) forwardly passes through the sealing groove catheter (2.13), the rear sealing rubber plug (2.11), the blood return cavity, the front sealing rubber plug (2.10), and the barrier (1.4) in sequence, and then passes through a catheter (1.1); the needle tube (2.1) is in sliding but damping sleeve connection with inner cavities at both ends of the seal groove catheter (2.13), enters the blood return side hole (2.1.1) of the seal groove catheter (2.13) during needle withdrawal, and is located in the seal groove catheter (2.13) when the needle withdrawal is finished. The present invention features a quick blood return speed, thereby enabling quick observation of blood return; moreover, the length of the barrier (1.4) does not need to be greater than a tip-hole distance, the needle withdrawal resistance is also reduced, and the operation is thus convenient.