Ambulatory pump

A pump for delivering a selected output volume of fluid from a fluid supply to an output conduit in response to driving by a cyclical drive, the pump comprising:

• a rigid housing;
• a diaphragm having a peripheral edge, the peripheral edge being secured to the housing to define a pump chamber therebetween, the diaphragm otherwise being unsecured to the pump housing, the diaphragm having an inlet opening from the pump chamber to the fluid supply, the diaphragm being resiliently biased toward a metering position with the chamber having a fist selected volume, the diaphragm being drivable in response to the cyclical drive from the metering position to a discharged position having a second selected volume which is less than the first selected volume by a selected output volume;
• means for sealing the diaphragm inlet opening between the inlet opening and the cyclical driving means, the sealing means being movable between a sealing position and an unsealing position, the cyclical drive moving the sealing means to its sealing position during driving thereby closing the diaphragm inlet when the diaphragm is driven from the metering position by the cyclical drive;
• and
• a one-way outlet valve in fluid communication with the pump chamber permitting flow of the output volume of the fluid out of the pump chamber.

A disposable ambulatory infusion pump cassette usable with a control unit having a cyclical drive to deliver a selected output volume of fluid to an output conduit for parenternal injection of the selected output volume to a patient, the cassette comprising:

• a reservoir bag defining a fluid reservoir therein for storing a fluid;
• a rigid pump housing connected to the reservoir bag;
• a diaphragm within the bag having an inlet opening, the diaphragm being in fluid tight abutment with the pump housing to define a pump chamber therebetween, the diaphragm being resiliently biased toward a cup-shaped metering position with the pump chamber having a selected metering volume, said diaphragm further being drivable by the cyclical drive to a discharged position in which the pump chamber has a selected discharged volume which is less than the metering volume by a selected output volume;
• means for closing the diaphragm inlet when the diaphragm is driven from the metering position by the cyclical drive;
• and
• a one-way outlet valve permitting flow of the output volume of the fluid from the pump chamber.

A pump for delivering a selected output volume of fluid from a fluid supply to an output conduit in response to driving by a cyclical drive, the pump comprising:

• a rigid pump housing;
• a diaphragm in fluid tight abutment with the pump housing to define a pump chamber therebetween, the diaphragm being resiliently biased toward a selected metering position in which the diaphragm assumes a cup-shaped configuration and the pump chamber has a selected metering volume and the diaphragm further being drivable by the cyclical drive to a discharged position in which the pump chamber has a selected discharged volume which is less than the metering volume by a selected output volume;
• inlet means for selectively allowing a fluid to flow between the fluid supply and the pump chamber as the diaphragm moves from the discharged position to the metering position and for stopping the fluid flow between the pump chamber and the fluid supply when the diaphragm is driven from the metering position, comprising, an inlet hole in the diaphragm, a relaxation seal and means resiliently biasing the relaxation seal away from the inlet hole, the relaxation seal closing the inlet hole in response to the cyclical drive driving the diaphragm from the metering position;
• and
• a one-way outlet valve in fluid communication with the pump chamber permitting flow of the output volume of fluid out of the pump chamber.

A pump for delivering a selected output volume of fluid from a fluid supply to an output conduit in response to driving by a cyclical drive, the pump comprising:

• a rigid pump housing;
• a diaphragm in fluid fight abutment with the pump housing to define a pump chamber therebetween, the diaphragm having an opening for fluid communication between a fluid supply and the pump chamber, the diaphragm being resiliently biased toward a selected metering position in which the diaphragm assumes a cup-shaped configuration and the pump chamber has a selected metering volume and the diaphragm further being drivable by the cyclical drive to a discharged position in which the pump chamber has a selected discharged volume which is less than the metering volume by a selected output volume;
• valve means for selectively allowing a fluid to flow between the fluid supply and the pump chamber through the opening as the diaphragm moves from the discharged position to the metering position and for stopping the fluid flow between the pump chamber and the fluid supply when the diaphragm is driven from the metering position;
• and
• a one-way outlet valve in fluid communication with the pump chamber permitting flow of the output volume of fluid out of the pump chamber.

A pump for delivering a selected output volume of fluid from a fluid supply to an output conduit in response to driving by a cyclical drive, the pump comprising:

• a rigid pump housing;
• a diaphragm in fluid tight abutment with the pump housing to define a pump chamber therebetween, the diaphragm including integral means resiliently biasing the diaphragm toward a selected metering position in which the diaphragm has its lowest potential energy and the pump chamber has a selected metering volume and the diaphragm further being drivable by a cyclical drive to a discharged position in which the diaphragm has less potential energy than it does in any other position except the metering position and in which the pump chamber has a selected discharged volume which is less than the metering volume by a selected output volume;
• inlet means for selectively allowing a fluid to flow between the fluid supply and the pump chamber as the diaphragm moves from the discharged position to the metering position and for stopping the fluid flow between the pump chamber and the fluid supply when the diaphragm is driven from the metering position, the inlet means comprising an inlet hole in the diaphragm, a relaxation seal, and means resiliently biasing the relaxation seal away from the inlet hole, the relaxation seal closing the inlet hole in response to the cyclical driving means driving the diaphragm from the metering position;
• and
• a one-way outlet valve in fluid communication with the pump chamber permitting flow of the output volume of fluid out of the pump chamber.