Patent ID: 6702779
Filing Date: 2004-03-09
Classification: A61M

Abstract:
A device for delivering fluid at a constant selectable flow rate comprising:a housing; a reservoir in said housing for containing a supply of said fluid and for delivering said fluid under pressure; a primary restrictor channel and a rate selector channel each having a proximal end and a distal end, said proximal ends being in fluid communication with said reservoir; and a delivery cannula in fluid communication with said distal end of said primary restrictor and selector channels for delivering said fluid; said primary restrictor channel comprising a plurality of sections; said rate selector channel having a plurality of nodes, each node being in fluid communication with a corresponding section of said primary restrictor channel, and capable of being closed, such that when a particular node is closed, fluid flowing from said reservoir toward said cannula may not pass through the node but rather must pass through the corresponding section of said primary restrictor channel; wherein said nodes are defined by indentations in said housing, said device further having a flow rate selection device movably connected to said housing, said flexible membrane disposed between said housing and said flow rate selection device, said flow rate selection device further having a plurality of detents adapted to match said indentations such that said detents may be moved into alignment with any number of said indentations causing the corresponding nodes to be closed.