http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&d...
The graft material consisted in the reversed saphenous vein in 4 cases, the non-reversed devalvulated ex situ saphenous vein in 11, composite polytetrafluoroethylene (PTFE) + inversed saphenous vein in 6, and PTFE alone in 3 cases.

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Note added at 5 mins (2005-11-08 18:42:41 GMT)
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http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&d...
Orthostatic reflux in devalvulated deep veins constitutes another factor of stasis.

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Note added at 9 mins (2005-11-08 18:46:05 GMT)
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http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&d...
For those patients with deep venous thrombosis sequelae, such studies allow us to differentiate between occlusion/restriction states from *devalvulation*, and to detect the precise location of such sequelae, as well as their impact on circulatory function. When occlusion is found, varicose veins, which may be supplementary veins, are left untouched. When *devalvulation* occurs as an isolated phenomenon, superficial vein insufficiency is of primary importance.

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&d...
Although surgical repair is satisfactory, the operated heart is not anatomically normal. The patients have a variable degree of devalvulation of the pulmonary outflow tract, a scar on the right ventricle, a patch repairing the ventricular septal defect and scars on the atrium (cannulation for cardiopulmonary bypass).

http://www.jvascbr.com.br/03-02-01/03-02-01-49/03-02-01-49.h...
(3) during devalvulation, the vein is examined by the valvulotome and some inappropriate part of the vein may be removed;