Hydraulically actuated pump for long duration medicament administration
First Claim
1. A fluid delivery device comprising:
- a hydraulic housing having a piston configured to sealingly slide along an inner wall of the hydraulic housing and separate the hydraulic housing into a hydraulic pump chamber and a fluid reservoir, the hydraulic pump chamber having a viscous hydraulic fluid and configured to urge the piston along the inner wall to deliver a fluid in the fluid reservoir to a patient, a viscosity of the hydraulic fluid being at least about ISO VG 1000 or more;
a first actuator;
a first hydraulic reservoir chamber having the hydraulic fluid and coupled between the first actuator and the hydraulic pump chamber, the first actuator being configured to urge the hydraulic fluid in the first hydraulic reservoir chamber into the hydraulic pump chamber;
a flow restrictor fluidly coupling the first hydraulic reservoir chamber and the hydraulic pump chamber;
a second hydraulic reservoir chamber having the hydraulic fluid and fluidly coupled with the hydraulic pump chamber; and
a second actuator configured to urge the hydraulic fluid from the second hydraulic reservoir chamber into the hydraulic pump chamber, independent of the first actuator.
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Accused Products
Abstract
Presently disclosed is a hydraulic pump device and its use thereof, especially in a fluid delivery system. In one embodiment, the fluid delivery system is an inexpensive, single-use device for slow dosing medicament applications. The fluid delivery system may employ a spring-compressed bellows crank or other combination of simple mechanisms operating according to the well-known peristaltic principle to force a volume of ultrapure bio-inert hydraulic fluid through an aperture, thereby expanding one chamber of a two chamber hydraulic cylinder. The second, fluid storage chamber, containing the medicament, is emptied through a conventional orifice in response to the expansion of the pump chamber. The medicament may then flow through any suitable infusion set into a patient removeably attached thereto.
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Citations
23 Claims
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1. A fluid delivery device comprising:
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a hydraulic housing having a piston configured to sealingly slide along an inner wall of the hydraulic housing and separate the hydraulic housing into a hydraulic pump chamber and a fluid reservoir, the hydraulic pump chamber having a viscous hydraulic fluid and configured to urge the piston along the inner wall to deliver a fluid in the fluid reservoir to a patient, a viscosity of the hydraulic fluid being at least about ISO VG 1000 or more; a first actuator; a first hydraulic reservoir chamber having the hydraulic fluid and coupled between the first actuator and the hydraulic pump chamber, the first actuator being configured to urge the hydraulic fluid in the first hydraulic reservoir chamber into the hydraulic pump chamber; a flow restrictor fluidly coupling the first hydraulic reservoir chamber and the hydraulic pump chamber; a second hydraulic reservoir chamber having the hydraulic fluid and fluidly coupled with the hydraulic pump chamber; and a second actuator configured to urge the hydraulic fluid from the second hydraulic reservoir chamber into the hydraulic pump chamber, independent of the first actuator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A fluid delivery device comprising:
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a hydraulic housing having a piston configured to sealingly slide along an inner wall of the hydraulic housing and separate the hydraulic housing into a hydraulic pump chamber and a fluid reservoir, the hydraulic pump chamber having a hydraulic fluid, a viscosity of the hydraulic fluid being at least about ISO VG 1000 or more, the hydraulic pump chamber being configured to urge the piston along the inner wall to deliver a fluid in the fluid reservoir to a patient; a first hydraulic reservoir chamber having the hydraulic fluid; a fixed aperture flow restrictor fluidly coupling the first hydraulic reservoir chamber and the hydraulic pump chamber, the fixed aperture flow restrictor configured to control the rate the hydraulic fluid flows between the first hydraulic reservoir chamber and the hydraulic pump chamber; a first actuator coupled to the first hydraulic reservoir chamber and configured to continuously deliver the hydraulic fluid from the first hydraulic reservoir chamber to the hydraulic pump chamber for a period of time; a second hydraulic reservoir chamber fluidly coupled to the hydraulic pump chamber, independent of the first hydraulic reservoir chamber; and a second actuator coupled to the second hydraulic reservoir chamber and operable independent of the first actuator and at discrete intervals during the period of time to periodically deliver the hydraulic fluid from the second hydraulic reservoir chamber to the hydraulic pump chamber independent of and in addition to the continuous delivery of the hydraulic fluid from the first hydraulic reservoir chamber.
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Specification