Geiger A W, Zarubin A, Fahrenkamp A, Hertel M, von Bally G, Scheld H H
University of Muenster, Germany.
J Heart Valve Dis. 1993 May;2(3):343-7.
Dysfunction of prosthetic heart valves is a common complication after heart valve replacement, affecting both biologic and mechanical prostheses. A preoperative, non-destructive test of each individual valve may help to prevent the implantation of a valve which has material weaknesses. To this end we developed a technique for testing heart valve prostheses by holographic interferometry. The advantage of this technique is that it provides a non-contact, non-destructive, highly sensitive three dimensional analysis of the valve under loading. Samples of several mechanical and biologic valve substitutes were investigated. Deformations of the valve, due to small pressure differences applied to the samples in a specially developed test chamber, were recorded by double exposure holography. A fringe pattern superimposed on the image of the valve reconstructed from the hologram clearly indicates the presence of even the slightest defect in the valve material. Our experimental results demonstrate the ability of non-destructive holographic screening testing to detect defects or weaknesses which may potentially lead to dysfunction in replacement valves.
人工心脏瓣膜功能障碍是心脏瓣膜置换术后常见的并发症，影响生物瓣膜和机械瓣膜。术前对每个瓣膜进行无损检测有助于防止植入存在材料缺陷的瓣膜。为此，我们开发了一种通过全息干涉术检测心脏瓣膜假体的技术。该技术的优点是它能在加载状态下对瓣膜进行非接触、无损、高灵敏度的三维分析。研究了几种机械瓣膜和生物瓣膜替代品的样本。在专门设计的测试腔中，通过对样本施加小的压差，利用双曝光全息术记录瓣膜的变形情况。从全息图重建的瓣膜图像上叠加的条纹图案清楚地表明了瓣膜材料中即使是最微小的缺陷。我们的实验结果证明了无损全息筛选测试能够检测出可能导致置换瓣膜功能障碍的缺陷或弱点。
