Patent ID: 7056475

Claim:
A micro pumping device for transporting small volumes of biological fluid comprising: a collapsor that delivers a compressive force to a deformable material, said collapsor comprising at least one bearing chosen from roller bearings and ball bearings: and a cartridge adapted to receive at least one biological fluid, said cartridge including: at least one pliable surface, said pliable surface comprising said deformable material which collapses in response to a compression force delivered from said collapsor; and a rigid core adjacent to said pliable surface and opposite said collapsor, said rigid surface adapted to aid said collapsor in collapsing said pliable surface; wherein said collapsor comprises a collapsor surface with protrusions having predetermined spacing, said predetermined spacing creating corresponding concavities in said pliable surface as said collapsor collapses said pliable surface against said rigid core, displacement from said corresponding concavities thereby causing a predetermined amount of biological fluid to be delivered from the cartridge.