Device to control the transmembrane pressure in a plasmapheresis system
US4412553A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 1981 |
| Grant date | Nov 1, 1983 |
| Priority date | — |
| Expiry date | Jun 25, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/2663
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A fluid flow control device comprises first second, and third fluid pathways. The first and second pathways are adapted for communication with separate sources of pressurized fluid. The third pathway is coupled in flow communication with the first pathway and includes a flexible wall which forms an interface with a portion of the second pathway. The flexible wall meters the flow communication between the first and third pathways in response to fluid pressure fluctuations in the second pathway. The fluid pressure in the first pathway is thereby elevated until substantial equilibrium with the fluid pressure in the second pathway occurs, and is thereafter continuously adjusted in response to subsequent fluctuations of fluid pressure in the second pathway to maintain this condition of substantial equilibrium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.