Patent ID: 9072828
Filing Date: 2015-07-07
Classification: A61M,F04B

Abstract:
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.