Tubing failure during prolonged roller pump use: a laboratory study.
Perfusion
; 14(6): 443-52, 1999 Nov.
Article
em En
| MEDLINE
| ID: mdl-10585152
ABSTRACT
Little is known about the mechanical forces acting on extracorporeal circuit tubing with prolonged roller pump use during extracorporeal membrane oxygenation (ECMO). We examined the time to tubing rupture of three different materials during actual roller pump use, mean and standard deviation (SD) (SD shown in parentheses) Tygon (control) 243.7 h (175.4); LVA 121 h (14.3); and SRT 6.6 h (2.1). Failure times for both LVA and SRT were significantly different from the control (paired t-test, p = 0.02 and p < 0.001, respectively). The minimum failure times for Tygon and LVA were 99 and 101 h, respectively. We then examined Tygon under conditions of pure compression, demonstrating that even after 3.67 million compression cycles at full occlusion crack formation did not occur. If the tubing was over-occluded, cracks appeared within 24 h. Scanning electron microscopy of Tygon, which has been used during clinical ECMO, and the failure pattern during destruction testing demonstrate that shear stress and compression coexist during clinical ECMO. Use of under-occlusive pump settings could improve tubing life.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Coração Auxiliar
Idioma:
En
Revista:
Perfusion
Assunto da revista:
CARDIOLOGIA
Ano de publicação:
1999
Tipo de documento:
Article
País de afiliação:
Reino Unido