Patent ID: 8377043
Filing Date: 2013-02-19
Classification: A61M

Abstract:
1. A dispensing apparatus for dispensing fluids to a patient comprising: (a) a housing having a fluid reservoir for containing fluid to be dispensed to the patient, said fluid reservoir comprising a bellows structure having an expandable and compressible, accordion-like, annular-shaped sidewall expandable from a first contracted configuration to a second expanded configuration, said housing being provided with an inlet for permitting fluid flow into said fluid reservoir and an outlet for permitting fluid flow from said fluid reservoir; (b) pusher means disposed within said housing for movement between a first position and a second position to cause said annular-shaped sidewall to move toward a contracted configuration and to cause said fluid contained within said fluid reservoir to flow toward said outlet of said housing; (c) stored energy means disposed within said housing for acting upon said pusher means to cause said pusher means to move toward said second position, said stored energy means comprising a constant force spring; (d) fill means carried by said housing for filling said fluid reservoir with the fluid to be dispensed; (e) flow control means carried by said housing for controlling fluid flow from said fluid reservoir to the patient, said flow control means comprising: (f) dispensing means connected to said housing, said axially extending passageways of said first and second selector members being in communication with said dispensing means.