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An improved elastomeric pump for an infusion assembly. The pump includes a generally cylindrical mandrel body with first end, an opposed second end, a length, an outer diameter corresponding to a first radius (Rmandrel), a central bore extending through the length, a first port extending from the ou

An improved elastomeric pump for an infusion assembly. The pump includes a generally cylindrical mandrel body with first end, an opposed second end, a length, an outer diameter corresponding to a first radius (Rmandrel), a central bore extending through the length, a first port extending from the outer diameter to the bore to provide a fluid passageway, a fill port and an exit port in fluid communication with the bore. The pump includes an inflatable elastomeric tube disposed concentrically about the mandrel, the tube being sealingly secured on the mandrel near the respective ends of the tube and having an original inner diameter that corresponds to a second radius (r) so that it approximately matches the outer diameter of the mandrel (Rmandrel), a length (L) less than the length of the mandrel, a wall thickness (t) such that: (0.4225×r)t≦(0.660×r).

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1. An elastomeric pump for an infusion assembly, the pump comprising: a mandrel comprising a generally cylindrical body having first end and an opposed second end, a length, a generally uniform outer diameter that corresponds to a first radius (Rmandrel), a central bore extending through the length,

1. An elastomeric pump for an infusion assembly, the pump comprising: a mandrel comprising a generally cylindrical body having first end and an opposed second end, a length, a generally uniform outer diameter that corresponds to a first radius (Rmandrel), a central bore extending through the length, a first port positioned between the first end and second end and extending from the outer diameter to the bore to provide a fluid passageway, a fill port at about the first end in fluid communication with the bore, and exit port at about the second end in fluid communication with the bore; andan inflatable elastomeric tube disposed concentrically about the mandrel, the tube positioned between the first end and second end of the mandrel and covering the first port, the tube being sealingly secured on the mandrel near the respective ends of the tube and having an original inner diameter that corresponds to a second radius (r) so that it approximately matches the outer diameter of the mandrel (Rmandrel), a length (L) less than the length of the mandrel, a wall thickness (t) such that: (0.4225×r)