Patent ID: 6505622
Filing Date: 2003-01-14
Classification: A61M,B05B

Abstract:
A pump mechanism in combination with a medicament-dispensing system having a deformable body portion for providing spring action to said pump mechanism, and a nozzle portion through which said medicament is emitted, which comprises:a vial for holding a volume of medicament; an elastic pouch positioned within said vial, interior of said elastic pouch containing varying amounts of air, said air in said elastic pouch being in communication with external ambient air via an air-flow channel, and the volume of said elastic pouch being variably altered as a function of the volume of medicament contained in the vial; a pump sleeve positioned within said deformable body portion, said sleeve having a dosage cavity of a predetermined volume for collecting medicament from said vial, said dosage cavity being connected to said nozzle portion, said sleeve also having a fluid-inlet orifice for channeling said medicament into said dosage cavity; a piston at least partially and slidably positioned within said pump sleeve for emitting said medicament from said dosage cavity via said nozzle portion, said piston being operationally coupled to said deformable body portion; and at least one O-shaped ring on annular portion of said piston and slidably engaging said pump sleeve, wherein said O-shaped ring provides a fluid-tight seal.