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Compliant rotor for an improved cartridge for drug infusion pump

  • US 5,326,236 A
  • Filed: 09/24/1993
  • Issued: 07/05/1994
  • Est. Priority Date: 09/24/1993
  • Status: Expired due to Term
First Claim
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1. In a segmented peristaltic cartridge comprising a housing, a cover, and an open segment therebetween, said combination defining pump and chamber therein, said cartridge having respective inlet and outlet ports at opposite ends thereof, the housing including a rear segment wherein an arc of approximately 240°

  • forms the internal periphery thereof, the cover, having an arc of approximately 240°

    which forms the internal periphery thereof, is joined to the housing, a tubing track is created by the space between said housing and said cover, said inlet and outlet ports being formed by the mating of said housing and cover segments, and a pump frame engaging said housing at the open segment thereof and providing a surface completing a missing chord of said tubing track, an improved rotor including an eccentric rotor and rotor shaft disposed in said chamber in the cartridge between said rear housing and said front cover, a sleeve mounted on the rotor, a length of resilient tubing spirally wrapped around said sleeve to be disposed in said tubing track, and having opposite ends engaging respective inlet and outlet ports of the cartridge, the improved rotor including;

    a cylindrical body portion including an interior bore received on a motor shaft associated with the motor frame;

    an outer cylindrical surface thereof; and

    an eccentric structure mounted on the outer cylindrical surface of the rotor, said eccentric structure comprising at least one pair of base portions extending generally radially outwardly from the outer cylindrical surface of the rotor and spaced apart on the rotor cylindrical outer surface, a first beam member mounted at one end at the upper end of a first base portion, and an opposite end of the first beam member projecting outwardly from said first base portion, a second beam member having its one end mounted on an upper end of a second base portion, and an opposite end of the second beam member projecting outwardly from said second base portion, both first and second beam members disposed a common distance above the cylindrical outer surface of the rotor and generally concentric therewith, with the respective opposite ends of the beam members projecting toward each other but spaced apart at respective opposite ends thereof whereby in the assembled housing including said housing segment, cover segment, eccentric rotor, rotor sleeve and tube, the eccentric rotor engages said resilient tubing when the cartridge engages the motor frame and the rotor is connected to a rotational drive means, the flexible eccentric structure of the rotor enabling delivery of liquid medicant to a patient with increased reliability.

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