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Stability and dynamic deforming process for structureof coronary artery stents
Cheng-Ti Zhou,He-Yan Dong 한국물리학회 2005 Current Applied Physics Vol.5 No.5
Coronary stent is of a micro cylindrical net structure. In this paper stability and dynamic deforming process for structure of cor-onary artery stents in percutaneous coronary intervention (PCI) was studied by measurements of stent deformation under pressureand theoretical analysis. In PCI, a stent has two stages of loading (1) the stage stent in inated, and (2) the stage stent is left, and isunder the pressure of the shrinkage of the artery. For the rst stage, the change of the stent diameter was measured by the obser-vation with a microscope. Loaddisplacement curves of the stent in the ination process were got. The maximum deformation rateof the inating stent was 2.0 mm/s at the right end of the stent at the inating time 15.5 s. In the second stage, the buckling behaviorof the stent was studied. An ‘‘Intelligent Electronic Measurement Apparatus’’ was used for the buckling test of stents. Some newbuckling phenomena of multi-buckling were revealed in the tests. These results will be important for the research of the stentproperties..