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Fluid Infusion System, A Method of Assembling Such System and Drug Reservoir for Use in the System

  • US 20090299288A1
  • Filed: 04/19/2007
  • Published: 12/03/2009
  • Est. Priority Date: 04/19/2006
  • Status: Active Grant
First Claim
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1. A fluid infusion system for infusing a medication fluid comprising:

  • a reservoir adapted to contain the fluid and adapted for use with a pump drive system having a linear actuation member, the reservoir comprising;

    a proximal end adapted to connect to an infusion set;

    an open distal end;

    a cylindrical reservoir wall longitudinally extending along an axis from the proximal end to the distal end; and

    a piston adapted to be slideably and frictionally mounted within the reservoir and forming a fluid-tight barrier inside the reservoir;

    the piston comprising a piston body with at least one peripheral sealing portion made of a material having a first stiffness, said at least one sealing portion in sealing contact with the inside surface of the reservoir wall,wherein the piston further comprises a friction enhancing member having one or more wall engaging portions, wherein one or more wall engaging portion is at least partially made of a material having a greater stiffness than said first stiffness, one or more wall engaging portion frictionally engaging the cylindrical wall of the reservoir and being arranged to exert a radially outwards directed force component against the cylindrical wall.

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