초록 ▼

A fluid delivery apparatus for infusing medicinal fluids into a patient which is of a compact, low profile, laminate construction. The apparatus embodies a novel thermal expanding polymer material which uniquely functions as an internal energy source for expelling the medicinal fluids from the devic

A fluid delivery apparatus for infusing medicinal fluids into a patient which is of a compact, low profile, laminate construction. The apparatus embodies a novel thermal expanding polymer material which uniquely functions as an internal energy source for expelling the medicinal fluids from the device. The apparatus can be used for subdermal, intradermal and intramuscular infusion of fluids and in one form of the invention, includes a novel delivery cannula having a body portion disposed within a circuitous channel formed within the base superstructure of the apparatus and a pierceable portion which extends outwardly from the base of the apparatus. By constructing the cannula in a circuitous configuration and dynamically connecting it to the base assembly, movement of the cannula relative to the base assembly is permitted thereby minimizing needle related tissue necrosis. The heat-expandable mass which is heated by the patient's body temperature in a manner to controllably expel fluid from the device uniquely functions to provide a conformable ullage within the reservoir of the device which will effectively avoid extended flow delivery rate trail-off at the end of the fluid delivery period. Further, the heat expandable mass can be specifically tailored to provide precise, predictable protocol delivery of the medicinal agent stored within the reservoir of the device.

대표청구항 ▼

[ I claim:] [1.] A device for use in infusing medicinal fluid into a patient at a controlled rate comprising:(a) a housing having a rigid surface;(b) distendable means for forming, in conjunction with said rigid surface of said housing, a fluid reservoir having an inlet and an outlet, said distendab

[ I claim:] [1.] A device for use in infusing medicinal fluid into a patient at a controlled rate comprising:(a) a housing having a rigid surface;(b) distendable means for forming, in conjunction with said rigid surface of said housing, a fluid reservoir having an inlet and an outlet, said distendable means comprising at least one distendable membrane at least a portion of which is movable within said housing from a first position to a second position;(c) heat expandable means disposed within said housing in proximity to said distendable membrane, said heat expandable means comprising a semi-solid, which, upon being heated, will act upon said distendable membrane to move said membrane toward said second position to cause fluid within said reservoir to flow outwardly of said outlet of said reservoir; and(d) infusion means in communication with said outlet of said reservoir for infusing fluid from said fluid reservoir into the patient.