Patent ID: 6086569
Filing Date: 2000-07-11
Classification: A61M

Abstract:
A syringe for use with a plunger-type cartridge ampule of the type including a tubular body filled with injectable fluid having a first end closed by a moveable piston member and a second end closed by a flexible resilient membrane, said syringe comprising:an elongated body member having a cavity for accommodating one cartridge ampule therewithin and having axially disposed front and rear openings thereof;an elongated plunger having front and rear ends and extending into said cavity through said rear opening and thusly held for slidable translation longitudinally with respect to said body member;said plunger including a head at said front end thereof positioned within said cavity for engagement against and slidable movement of the piston member longitudinally within the tubular body and a manually engageable thumb actuator including an aperture, connected at said rear end for longitudinal movement of said plunger forcing said head of said plunger into the tubular body;means for connecting a hypodermic needle in axial alignment to said body member adjacent said front opening, such that when connected one end of the needle would be capable of extending through the flexible membrane into fluid communication with the injectable fluid; andsaid plunger further including a pressure indicator member mounted for limited longitudinal translation within said rear end and a spring bias means for maintaining said pressure indicator member in an at-rest position when no manual pressure is being applied against said thumb actuator;said pressure indicator member extending rearwardly through said aperture in said thumb actuator and for placement against the thumb of an operator in proportion to an amount of thumb pressure being applied against said thumb actuator by the operator to express the injectable fluid from the ampule by movement of the moveable piston member whereby the operator is provided with thumb-sensed indicia of fluid injection pressure level in the ampule.