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Peristaltic linear pump with contoured rollers

  • US 4,867,744 A
  • Filed: 05/21/1987
  • Issued: 09/19/1989
  • Est. Priority Date: 05/21/1987
  • Status: Expired due to Fees
First Claim
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1. A peristaltic pump comprising a series of roller assemblies each having concentric inner and outer bearing members freely rotatable with respect to each other;

  • a drive shaft;

    said inner bearing members being eccentrically mounted upon said drive shaft with the centers of said inner bearing members being equidistant from the axis of said drive shaft and spaced uniform angular distances thereabout to describe a helix about said axis;

    journal means rotatably supporting said drive shaft;

    power means for rotating said drive shaft;

    a straight, tube of flexible and deformable polymeric material generally parallel with the longitudinal axis of said shaft, and platen means supporting said tube for successive occlusive compression by said roller assemblies of said series to direct fluid longitudinally through said tube;

    wherein the improvement comprisessaid outer bearing member of each roller assembly having a generally cylindrical outer surface terminating at one end in a concentric annular rim projecting radially outwardly beyond said cylindrical surface;

    said rim of the outer bearing member of each roller assembly having a diameter sufficient to cause occlusion of said tube when said roller assembly is at its perigee in relation to said tube and platen means; and

    said cylindrical surface of each bearing member having a diameter sufficient only to cause non-occlusive deformation of said tube at said perigee.

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