Issue |
J Extra Corpor Technol
Volume 15, Number 2, April 1983
|
|
---|---|---|
Page(s) | 25 - 34 | |
DOI | https://doi.org/10.1051/ject/198315225 | |
Published online | 18 September 2023 |
Original Article
Gaseous Emboli Removal Efficiency in Arterial Screen Filters: A Comparative Study
Department of Cardiovascular and Thoracic Surgery, Rhode Island Hospital, Providence, Rhode Island
* Please direct communications to: Ronald J. Massimino, 106 Moorefield St., Providence, RI 02909.
Received:
October
1982
Revised:
February
1983
Accepted:
March
1983
Seven commercially available arterial filters were evaluated for their effectiveness in removing gaseous emboli produced by various sources. All filters were of the screen type and ranged from 20–40 micron pore size.
The first phase of the study consisted of an appraisal of carbon dioxide flushing to facilitate priming. Two filters of each type were used. The first filter was primed without a carbon dioxide flush. The second filter was flushed with carbon dioxide.
Immediately after priming, microemboli were monitored distal to the filters for 10 minutes at 6 L/Min.
In the second phase each filter’s capability of removing gaseous emboli when used in conjunction with a bubble oxygenator was evaluated. Microemboli were alternately monitored pre and post filter at fluid flow rates ranging from I to 6 L/Min. At each liter of fluid flow rate the gas:fluid ratio was varied from 1:1 to 3:1.
In the third phase of the study, the efficacy of each filter in removing varying amounts of room air was evaluated. Boluses of room air ranging from 1 to 50 cc. were injected proximal to the filter with microembolism monitoring distally. Injections were made at flow rates ranging from 1 to 6 L/Min.
Although carbon dioxide flushing does facilitate priming the filters, it does not reduce microemboli counts distally. Gaseous emboli removal rates ranged from 69.6 to 100% when used in conjunction with a bubble oxygenator. Air emboli activity distal to the filter after air injections ranged from 0 to 91,000 counts/L of fluid flow.
© 1983 AMSECT
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