Patent ID: 6045534
Filing Date: 2000-04-04
Classification: A61M,A61N

Abstract:
An apparatus for delivering a drug, comprising:a) a housing disposed within said first chamber, said piston defining a second proximal end and defining a first chamber therein;b) a piston disposed within said first chamber, said piston defining a second chamber therein;c) a piston core movably disposed within said second chamber of said piston and defining a reservoir between said piston and said piston core;d) a pressure source proximate said proximal end and in communication with said first chamber;e) an injection device coupled to the piston core and in communication with said reservoir for delivery of a dose of a drug contained therein;f) an adjustment device coupled to the housing for adjusting the dose; andg) the piston core includes an externally threaded spindle attached on a distal end to an adjustment knob and threadedly engaged with an internally threaded ring, said ring engaged with said housing and providing a stop for said piston upon activation of said pressure source.