Concentric microaggregate blood filter
US4954251A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 1989 |
| Grant date | Sep 4, 1990 |
| Priority date | — |
| Expiry date | Jan 31, 2009 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2202/0413
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Microaggregate blood filter adapted to pre-filter aggregates larger than 150 microns without interfering with the on-going and continuous filtration of aggregates between 40 and 150 microns. Filter comprises a flexible housing having inlet and outlet ports and an interior nest of two generally cylindrical concentric outer and inner filter screens with a space between the screens. Blood to be filtered enters the housing from the top and is pre-filtered for aggregates larger than 150 microns by the inner screen. The inner screen defines a relatively large interior volume which allows filtered aggregates to collect by sedimentation at its lower portions in a manner that permits on-going, continuous, and unobstructed filtration of the blood through its upper portion for subsequent and final filtration through the outer 40 micron filter. A preferred filter has a transparent housing and built in drip chamber and can be primed without inverting the filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.