Drug infusion device
First Claim
1. A drug delivery infusion device comprising an injection means in fluid connection with a drug reservoir chamber and pressure-generation means coupled to both said drug reservoir and to a liquid-filled control chamber containing a drug, wherein the coupling is such that said liquid-filled control chamber for providing a drug infusion at a controlled and steady rate serves to constrain the motion of the pressure-generation means, thereby controlling a drug infusion rate, wherein said liquid-filled control chamber is associated with means for controlled depletion of the liquid therein whereby depletion of the liquid in said control chamber enables said pressure-generation means to drive a drug in said reservoir chamber therefrom for infusion thereof.
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Accused Products
Abstract
The invention provides a drug delivery infusion device comprising an injection means (18) in fluid connection with a drug reservoir chamber (12) and pressure-generation means (10) coupled to both the drug reservoir (12) and to a liquid-filled control chamber (13), wherein the coupling is such that the liquid-filled control chamber (13) serves to constrain the motion of the pressure-generation means (10), thereby controlling the drug infusion rate, wherein the liquid-filled control chamber (13) is associated with means for controlled depletion of the liquid therein whereby depletion of the volume of liquid in the control chamber enables the pressure-generation means to drive the drug in the reservoir chamber therefrom for infusion thereof.
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Citations
26 Claims
- 1. A drug delivery infusion device comprising an injection means in fluid connection with a drug reservoir chamber and pressure-generation means coupled to both said drug reservoir and to a liquid-filled control chamber containing a drug, wherein the coupling is such that said liquid-filled control chamber for providing a drug infusion at a controlled and steady rate serves to constrain the motion of the pressure-generation means, thereby controlling a drug infusion rate, wherein said liquid-filled control chamber is associated with means for controlled depletion of the liquid therein whereby depletion of the liquid in said control chamber enables said pressure-generation means to drive a drug in said reservoir chamber therefrom for infusion thereof.
Specification