INTERNAL CAM METERING PUMP
First Claim
Patent Images
1. A micropump for delivery of medication by infusion, comprising:
- a pump housing;
a piston positioned in the pump housing having a longitudinal piston axis; and
a motor adapted to rotate the piston about the piston axis;
the pump housing having an axial opening receiving the piston, a first aperture positioned radially with respect to the piston axis and communicating with a reservoir, and a second aperture radially positioned with respect to the piston axis communicating with a cannula;
the piston having an eccentric cam surface at one end thereof, said cam surface adapted to sequentially open and close the first aperture and the second aperture at respective rotational positions of the piston;
whereinthe axial position of the piston inside the pump housing determines a pump volume space.
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Accused Products
Abstract
A micropump according to the invention uses an eccentric cam member rotating within a pump housing to sequentially open and close valves in the pump housing to withdraw fluid from a reservoir and provide metered amounts of the fluid to a cannula port for administration to a patient. The micropump may be used in a disposable pump for continuous infusion of medication such as insulin.
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Citations
20 Claims
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1. A micropump for delivery of medication by infusion, comprising:
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a pump housing; a piston positioned in the pump housing having a longitudinal piston axis; and a motor adapted to rotate the piston about the piston axis; the pump housing having an axial opening receiving the piston, a first aperture positioned radially with respect to the piston axis and communicating with a reservoir, and a second aperture radially positioned with respect to the piston axis communicating with a cannula; the piston having an eccentric cam surface at one end thereof, said cam surface adapted to sequentially open and close the first aperture and the second aperture at respective rotational positions of the piston;
whereinthe axial position of the piston inside the pump housing determines a pump volume space. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification