Patent ID: 7601137
Filing Date: 2009-10-13
Classification: A61M

Abstract:
1. A needle-less injector having a housing, wherein the injector comprises: a chamber for containing liquid to be injected; a supply line for transferring liquid from a reservoir to the chamber; a liquid outlet for the chamber positioned at the front end of the injector; a single piece dispensing member in contact with the liquid in the chamber and movable in a first direction to reduce the volume of the chamber to cause the liquid contained in the chamber to be expelled through the liquid outlet; a drive means for actuating the injector, wherein the dispensing member is a single piece piston with a spring attached thereto, whereby the single piece piston is spring-loaded and is: a sensor associated with the supply line that detects the presence or absence of liquid to be injected in the supply line, said sensor being linked to the drive means, whereby the dispensing member is not actuated by the drive means when the absence of liquid to be injected is detected in the supply line.