van Boxtel Astrid Gerritje Maria, Ebels Tjark
Department of Cardio-Thoracic Surgery, University Medical Centre Groningen, 9732GZ Groningen, The Netherlands.
Interdiscip Cardiovasc Thorac Surg. 2025 Aug 5;40(8). doi: 10.1093/icvts/ivaf163.
Surgical prosthetic valve labelling is misleading, as labelled diameters (LDs) are currently always larger than inlet orifice diameter (IOD), while the outlet orifice diameter (OOD) is unknown. The IOD, OOD, and height of the flow channel determine its conical shape. The instructions for use (IFUs) do not list all essential metrics. This study reports a comprehensive overview of all relevant aortic stented tissue prosthetic valve metrics.
We measured the OOD of these valves with an optical method. Height was measured using a calliper. The conicity angle of the flow channel was calculated. We hunted for IFU on the internet and in packaging boxes.
Eight valve models of 4 manufacturers were included. In all but 2 models, the OODs were smaller (89%, range 83%-95%) than their IODs, which depicts a converging shape of the flow channel. In 1 model (Avalus) OOD equals IOD, implicating a cylindrical flow channel; and 1 model (Crown) has a diverging shape. The proportion of OOD in relation to IOD seemed to be consistent among the different sizes within the same model type.
Information on metrics for surgical aortic tissue valves is incomplete, scarce, and confusing. This article shows a comprehensive overview of valve metrics, which makes it possible to compare different aortic valve models and sizes. Flow channel shape turned out to be different amongst models. The smallest flow channel diameter is most often the OOD. Since LD should reflect the IOD, one must be aware of all relevant metrics.
外科人工瓣膜的标签具有误导性，因为目前标注的直径（LD）总是大于入口孔径（IOD），而出口孔径（OOD）未知。IOD、OOD和流道高度决定了其圆锥形状。使用说明书（IFU）并未列出所有关键指标。本研究全面概述了所有相关的主动脉带支架组织人工瓣膜指标。
我们采用光学方法测量这些瓣膜的OOD。使用卡尺测量高度。计算流道的锥角。我们在互联网和包装盒中查找IFU。
纳入了4个制造商的8种瓣膜型号。除2种型号外，所有型号的OOD均小于其IOD（89%，范围83%-95%），这表明流道呈收敛形状。在1种型号（Avalus）中，OOD等于IOD，意味着流道为圆柱形；而1种型号（Crown）具有发散形状。在同一型号类型的不同尺寸中，OOD与IOD的比例似乎是一致的。
外科主动脉组织瓣膜的指标信息不完整、稀缺且令人困惑。本文全面概述了瓣膜指标，使得比较不同的主动脉瓣膜型号和尺寸成为可能。结果表明不同型号的流道形状不同。最小的流道直径通常是OOD。由于LD应反映IOD，因此必须了解所有相关指标。
