Infusion apparatus
A compact fluid dispenser for use in controllably dispensing fluid medicaments, such as, antibiotics, oncolytics, hormones, steroids, blood clotting agents, analgesics, and like medicinal agents from prefilled containers at a uniform rate. The dispenser uniquely includes a stored energy source that is provided in the form of a substantially constant-force, compressible-expandable wave spring that provides the force necessary to continuously and uniformly expel fluid from the device reservoir. The device further includes a fluid flow control assembly that precisely controls the flow of medicament solution to the patient.
1 . A dispensing apparatus for dispensing fluids to a patient comprising:
(a) an outer housing having a first, second and third portions;
(b) an inner, expandable housing disposed within said outer housing, said inner expandable housing having a fluid reservoir provided with an inlet for permitting fluid flow into said fluid reservoir;
(c) stored energy means disposed within said second portion of said outer housing for acting upon said inner expandable housing to cause the fluid contained within said fluid reservoir to controllably flow outwardly toward the patient, said stored energy means comprising a compressively deformable, spring member carried within said second portion of said outer housing, said spring member being expandable to cause fluid flow from said fluid reservoir;
(d) fill means carried by said outer housing for filling said reservoir with the fluid to be dispensed;
(e) flow control means connected to said first portion of said outer housing for controlling fluid flow from said reservoir, said flow control means comprising a flow control assembly including:
(i) a flow control member disposed within said inner expandable housing, said flow control member having a plurality of elongated flow control channels;
(ii) selector means operably associated with said flow control member for rotating said flow control member; and
(iii) dispensing means connected to said flow control member for dispensing fluid to the patient.
2 . The apparatus as defined in claim 1 in which said flow control assembly further comprises:
(a) an outer casing circumscribing said flow control member; and
(b) distribution means formed in said flow control member for distributing fluid from said fluid reservoir to each of said plurality of elongated flow control channels.
3 . The apparatus as defined in claim 2 in which said flow control member is provided with an inlet passageway in communication with said fluid reservoir and in which said flow control assembly further includes filter means carried by said flow control member for filtering fluid flowing toward said distribution means.
4 . The apparatus as defined in claim 3 in which said distribution means comprises a plurality of radially extending flow passageways formed in said flow control member.
5 . The apparatus as defined in claim 3 , further including volume indicator means carried by said outer housing for indicating the volume of fluid remaining in said fluid reservoir.
6 . The apparatus as defined in claim 3 further including disabling means carried by said outer housing for preventing fluid flow toward said dispensing means.
7 . The apparatus as defined in claim 3 in which said outer housing includes a cavity in communication with said inlet of said fluid reservoir and in which said fill means comprises a pierceable septum disposed within said cavity.
8 . The apparatus as defined in claim 7 in which said fill means comprises a first fill vial receivable within said third portion of said outer housing.
9 . The apparatus as defined in claim 8 in which said fill means comprises a second fill vial receivable within said third portion of said outer housing.
10 . The apparatus as defined in claim 9 in which said third portion of said outer housing includes:
(a) a fluid passageway in communication with said inlet of said fluid reservoir;
(b) a first chamber for telescopically receiving said first fill vial;
(c) an elongated support mounted within said first chamber, said elongated support having an elongated hollow needle, said hollow needle defining a flow passageway in communication with said fluid passageway;
(d) a second chamber for telescopically receiving said second fill vial; and
(e) an elongated support mounted within said second chamber, said elongated support having an elongated hollow needle, said hollow needle defining a flow passageway in communication with said fluid passageway.