After general remarks on the flow behaviour in blood circulation
some experiments are described which were carried out on models in
the Aero dynamischen Institut at the TH Aachen. In artery
branchings, especially in prostheses, the sedimentation of
substances which cause a stenosis can become critical because of
secondary flows. Results obtained up to now are described on the
variations of the unsteady flow conditions caused by the elasticity
of the artery walls, as well as on the possibility and the danger
of gas separation induced by the flow and wave phenomena. On models
of artificial heart valves (aorta and mitralis prostheses) the flow
pattern is observed and the pressure drop is measured; here the
charac teristic parameters (size of prostheses related to aorta
diameter, lift of the valve body, asymmetric position in the aorta
inlet) are systematically varied, From the drag measurements an
optimum arrangement for each valve type can be evaluated concerning
the reduction of the heart muscle performance and of the formation
of stagnation regions (danger of thrombosis). Finally model tests
with swine blood in a special facility have confirmed that certain
flow phenomena bring on a mechanically caused hemolysis."
General
| Imprint: |
VS Verlag fur Sozialwissenschaften
|
| Country of origin: |
United Kingdom |
| Series: |
Arbeitsgemeinschaft Fur Forschung Des Landes Nordrhein-Westf, 203 |
| Release date: |
1970 |
| First published: |
1970 |
| Authors: |
Heinz Siegfried Wolff
|
| Dimensions: |
244 x 170 x 4mm (L x W x T) |
| Format: |
Paperback - Trade
|
| Pages: |
82 |
| Edition: |
1970 ed. |
| ISBN-13: |
978-3-663-00460-8 |
| Languages: |
German
|
| Categories: |
Books >
Medicine >
General issues >
General
Promotions
|
| LSN: |
3-663-00460-0 |
| Barcode: |
9783663004608 |
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