Method and apparatus for protecting a pump mechanism from extran

Details Method and apparatus for protecting a pump mechanism from extran Method and apparatus for protecting a pump mechanism from extran

1997-06-11

1999-08-17

Freay, Charles G.

Pumps

Expansible chamber type

Elongated flexible chamber wall progressively deformed

417 53, 604153, F04B 4312, F04B 4308

Patent

active

059384131

ABSTRACT:
A plurality of finger members disposed adjacent each other are moved by a driving mechanism in a reciprocal, sequential manner. Infusion is carried out when the finger members engage an infusion tube in a peristaltic sequence. The finger members contact each other by projections formed integrally on the upper and lower surfaces of the finger members to reduce the contact surface area. A fluid diversion guiding hole is contained in a tube-pressing portion of each finger member. The guide holes of adjacent finger members are aligned to form a continuous channel for discharging leaking infusion fluid. Bevels surround the guiding holes and are inclined toward the center of the hole. Each finger member also includes a rib that is integral with and protrudes upward from the upper surface of the finger member for blocking infusion fluid from the finger members and drive mechanism. In a preferred embodiment, the projections are linear and substantially parallel with the sides of the guiding hole which are, in turn, parallel with the movement of the tube-pressing portion.

REFERENCES:
patent: 5165874 (1992-11-01), Sancoff et al.
patent: 5499906 (1996-03-01), O'Leary
patent: 5511951 (1996-04-01), O'Leary
patent: 5513957 (1996-05-01), O'Leary
patent: 5549460 (1996-08-01), O'Leary
patent: 5660529 (1997-08-01), Hill
patent: 5709534 (1998-01-01), O'Leary
patent: 5716194 (1998-02-01), Butterfield et al.
patent: 5741121 (1998-04-01), O'Leary

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