Patent ID: 7337922
Filing Date: 2008-03-04
Classification: A61M,Y10S

Abstract:
1. An infusion pump comprising: a first shell defining a non-planar interior surface; a second shell removably secured to said first shell; a platen defining a non-planar surface complementary to said interior surface of said first shell, said platen being positioned between said first and second shells such that said non-planar surface of said platen faces said interior surface of said first shell and defines a variable-volume space therebetween, said space being configured to hold a fluid delivery bag therein; a rod positioned between said platen and said second shell and extending in a direction perpendicular to a first direction of travel of said platen which decreases the volume of said space; a first block and a second block, wherein each of said first and second blocks slides upon said rod; a first parallelogram linkage and a second parallelogram linkage, said first parallelogram linkage positioned on a first side of said first and second blocks and said second parallelogram linkage positioned on a second side of said first and second blocks, wherein each of said first and second parallelogram linkages is rotatably coupled to said platen, said second shell, said first block and said second block; a first spring and a second spring, said first spring applying a first spring force to said first block and said second spring applying a second spring force to said second block, wherein said first and second spring forces tend to move said first and second blocks toward one another to bias said platen in said first direction to decrease the volume of said space; wherein said platen is configured to compress said fluid delivery bag to expel fluid therefrom when said platen is moving in said first direction.