FLUID DELIVERY DEVICE AND METHOD

摘要

A fluid delivery injector comprises a syringe defining a barrel; a plunger and a hollow needle provided within the barrel adapted for linear movement parallel to a longitudinal axis with a distal tip of the needle contained within the syringe. A fluid retention reservoir is defined at least in the barrel and is in fluid communication with the needle when pressure is applied to the fluid in the reservoir and to the plunger for moving the needle out of the barrel. A spring may be provided for retracting the needle when pressure is released from the plunger.

主权项

1. A fluid delivery injector comprising:
a syringe having:
a barrel with a peripheral wall having a longitudinal axis and a distal end wall;a plunger movable with the barrel parallel to the longitudinal axis towards and away from the end wall;at least one hollow needle anchored at its proximal end to the plunger and extending parallel to the axis towards the end wall with the needle contained within the barrel;a fluid retention reservoir defined in at least the barrel;the fluid retention reservoir in fluid communication with inlet port of the needle when a volume confining pressure is applied to the fluid; whereby the needle is projected beyond the end wall of the barrel only when pressure is applied to the plunger in the direction of the distal end wall.