Patent ID: 6802823
Filing Date: 2004-10-12
Classification: A61M

Abstract:
A medication delivery system comprising:a) an infusion pump including, a fluid storage chamber for storing fluid medication, a displacement piston displacably positionable to expand or contract said fluid storage chamber, an elastic member transitionable between a more stressed position and a less stressed position to displace said displacement piston, a pump outlet for discharging a fluid from said infusion pump in response to displacement of said displacement piston, a pump flowpath providing fluid communication between said fluid storage chamber and said pump outlet, wherein said pump flowpath has a flow restriction and a drip chamber with a drip chamber wall, an upper portion, and a lower portion, and wherein said flow restriction is sized to convert a continuous stream of a fluid entering said flow restriction from said fluid storage chamber to a drip stream exiting said flow restriction into said drip chamber, and an outlet tube positioned beneath said flow restriction in said lower portion of said drip chamber and extending toward said upper portion, said outlet tube having a smaller cross section than said drip chamber to define a fluid accumulation space between said outlet tube and said drip chamber wall where at least some of said fluid exiting said flow restriction into said drip chamber accumulates; and b) a bolus injector positioned downstream of said fluid storage chamber in fluid communication with said fluid storage chamber, said bolus injector including, a flexible bladder, a bolus chamber enclosed by said flexible bladder, an injector inlet into said bolus chamber, and an injector outlet from said bolus chamber.