Infusion pump with means for measuring the tube internal diamete

Details Infusion pump with means for measuring the tube internal diamete Infusion pump with means for measuring the tube internal diamete

1989-12-15

1991-09-17

Smith, Leonard E.

Pumps

Expansible chamber type

Elongated flexible chamber wall progressively deformed

417 18, 73198, 604 67, F04B 4312

Patent

active

050490478

ABSTRACT:
An infusion pump system comprising means for measuring internal diameter of an associated pump supply tube formed from a flexible material, such as plastic or rubber. The means for measuring internal diameter may comprise an ultrasound system including at least one transmiter and one receiver, as well as an evaluation unit. Alternatively, a mechanical system may be employed in the form of a counterpressure unit arranged perpendicular to the axis of the supply tube and including a movable plunger and an abutment surface for compression of the supply tube to be measured. A measurement and evaluation unit associated with the counterpressure unit determines the distance traversed by the movable plunger. The internal diameter of the tube may be determined by generating a force-displacement diagram. In accordance with one embodiment, the movable plunger is a pumping rod of a linear peristaltic pump.

REFERENCES:
patent: Re30088 (1979-09-01), Lund et al.
patent: 3850026 (1974-11-01), Lund et al.
patent: 4108575 (1978-08-01), Schal
patent: 4526515 (1985-07-01), De Vries
patent: 4545744 (1985-10-01), Weber et al.
patent: 4702675 (1987-10-01), Aldrovandi et al.
patent: 4976590 (1990-12-01), Baldwin
Krautkraemer et al., Werkstoffpruefung mit Ultraschall, pp. 562-565 (Jun. 1986).

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