초록 ▼

An infusion pump incorporates a cassette formed by bonding of two substantially flat sheets. The fluid to be infused to the patient comes into contact only with the cassette. The cassette includes first and second flexible sheets which define a pumping chamber therebetween. The infusion pump is prov

An infusion pump incorporates a cassette formed by bonding of two substantially flat sheets. The fluid to be infused to the patient comes into contact only with the cassette. The cassette includes first and second flexible sheets which define a pumping chamber therebetween. The infusion pump is provided with a pumping member having a hub and a plurality of petal-shaped sections extending radially outward therefrom and pivotal relative thereto. A stepping motor can be operated to move the pumping member against the second flexible sheet to decrease the volume of the pumping chamber and pump fluid to the patient. A load cell monitors the force exerted by the stepping motor on the hub. An outlet restriction valve is electronically controlled by a second stepping motor in response to the pressure sensed by the load cell to control pumping to a predetermined pressure. The pressure can be selectively varied which permits the use of a low pressure at low flow rates to decrease the time necessary to detect an occlusion in the output line.

대표청구항 ▼

A pump for parenteral administration of fluid to a patient at a selectable rate comprising: a flexible cassette formed of a pair of substantially flat flexible sheets defining a flow path between an inlet and an outlet, and a pump chamber located in that flow path; an instrument body having a compar

A pump for parenteral administration of fluid to a patient at a selectable rate comprising: a flexible cassette formed of a pair of substantially flat flexible sheets defining a flow path between an inlet and an outlet, and a pump chamber located in that flow path; an instrument body having a compartment receiving the cassette and confining the pump chamber; pumping means associated with the instrument body adjacent the compartment for confining the pump chamber, comprising a moveable hub circumferentially surrounded by radially extending petal-shaped sections each of which is pivotally mounted to the hub at its inner end and to a portion of the instrument body at its outer end; and activation means for activating the pumping means to move the hub and the petal-shaped sections into the compartment to reduce the volume of the pump chamber at a rate dependent upon the selected rate.