Patent ID: 7214221
Filing Date: 2007-05-08
Classification: A61M

Abstract:
1. A fluid delivery device for delivering a substance to a patient at an increment variable flow rate, comprising: an upper housing portion, having an upper housing body extending along a longitudinal axis between a distal and proximal end, and comprising a first chamber therein, said upper housing body having a first opening at said distal end accessing said first chamber; a lower housing portion slidably positioned within said first opening of said upper housing portion, said lower housing portion having a lower housing body extending along a longitudinal axis between a distal and proximal end, and comprising a second chamber therein, said lower housing body having a second opening at said proximal end accessing said second chamber; a plurality of springs, wherein each spring of said plurality includes a high, low, and mid-range of operation, and wherein at least one spring is a constant force spring adapted for application of a substantially constant pressure through said mid-range of operation of said at least one spring, and wherein said plurality of springs are positioned within at least one of said first and second chambers wherein: said second chamber comprises an inner and an outer surface and a first plurality of slots extending between said inner surface and said outer surface; and a ledge extending from said inner surface of said second chamber and having a second plurality of slots aligned with said first plurality of slots; at least one infusion device; and at least one reservoir in fluid communication with said at least one infusion device, said reservoir being positioned adjacent to at least one of said plurality of springs.