Computer controlled positive displacement pump for physiological flow simulation
US5284423A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 27, 1992 |
| Grant date | Feb 8, 1994 |
| Priority date | — |
| Expiry date | Oct 27, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D7/0688
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A positive displacement pump includes a reservoir for storing fluid, a cylinder for receiving and discharging the fluid and a piston within the cylinder for forcing the fluid into and out of the cylinder. The pump further includes a four-way valve having an inlet port connected to a reservoir, a pair of bidirectional ports connected to the opposite ends of the cylinder and an outlet port. Mechanisms are provided for receiving a user flow waveform expressed in terms of predetermined flow rate as a function of time and in response moving the piston and configuring the four-way valve to provide fluid flow from the reservoir through the valve and into one of the opposite ends of the cylinder, and from the other one of the opposite ends of the cylinder through the valve to the outlet port in accordance with the user flow waveform.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.