ローラーポンプ応力付加による人工心肺用ポリ塩化ビニル製ポンプチューブ表面の形態変化

抄録

Periodic-stress-induced morphological change on the inside and outside surfaces of polyvinyl chloride (PVC) pump tube, which was produced for the cardiac surgery, was observed on the basis of optical microscopy and atomic force microscopy in order to discuss the feature of the structural change in the pump tube during the operation. Different surface morphology was observed on inside and outside surfaces of the pump tube. Grainy ruggedness appeared on the outside surface, while numerous polygonal lamellae several μm in size spread over the inside surfaces of the original pump tube. After the periodic stress application by the roller pump, rugged stripes were observed on the outside surface sloped at the angle of 30∼50° from the stress direction as well as locally distributed grooves 10μm wide on the inside surface, and the number of the polygonal lamellae on the inside surface of the stressed pump tube was drastically decreased. It seems that the polygonal lamellae were peeled off from the inside surface of the pump tube. Such facts suggest that the inside surfaces of roller and wall sides in the pump tube contacted with each other under the stress, and that the peeled lamellae may flow into the interior of the body.