北京生物醫(yī)學(xué)工程

生物主動(dòng)脈瓣膜設(shè)計(jì)中的有限元分析模型

A new finite element analysis model in biological aortic heart valve design

作者：林韶?zé)?/a> 常兆華谷雪蓮

單位：上海理工大學(xué)醫(yī)療器械與食品學(xué)院(上海 200093)

關(guān)鍵詞：有限元分析；主動(dòng)脈瓣膜；設(shè)計(jì)；幾何結(jié)構(gòu)；應(yīng)力分布；閉合性能；縫制模型

分類號(hào)：

出版年·卷·期（頁(yè)碼）：2012·31·1（16-20）

摘要：

目的為了更好地分析生物心臟瓣膜的應(yīng)力分布及閉合性能，本研究提出一種新的有限元分析模型。方法利用點(diǎn)點(diǎn)接觸將瓣膜與支架的縫合點(diǎn)一一對(duì)應(yīng)以模擬瓣膜實(shí)際縫制過(guò)程，建立將平面設(shè)計(jì)的瓣膜縫制到支架上的模型，從而形成縫制模型。而對(duì)照模型則直接建立瓣葉的理想三維幾何結(jié)構(gòu)。在兩種模型的瓣葉上施加一定壓力，進(jìn)行有限元計(jì)算，將縫制模型與對(duì)照模型的應(yīng)力分布情況進(jìn)行對(duì)比，同時(shí)參照實(shí)際瓣膜的閉合情況對(duì)比上述兩種模型的閉合形態(tài)。結(jié)果縫制模型最大應(yīng)力集中部位為瓣葉兩翼，其瓣葉傾角及閉合形態(tài)分析均較可靠。結(jié)論有限元縫制模型可以為心臟瓣膜瓣葉性能分析提供比對(duì)照模型更精確的結(jié)果，從而為瓣葉形狀的設(shè)計(jì)和優(yōu)化提供指導(dǎo)依據(jù)。

Objective This paper proposes a new finite element analysis(FEA)model to mimic the actual valve shape and investigate the stress distribution and closure performance of leaflet. Methods In the suture model，two-dimensional design of leaflet is transferred to 3D model by FEA method which mimics the suture process. The contrast model，which is created by an ideal 3D geometry structure of valve，is utilized to compare the stress distribution differences between suture and contrast models. Meanwhile，the actual close state is investigated to validate the effectiveness of two models. Results The closing state and the angle of leaflet are reliable in the suture model with the wings of the valve leaflets being the maximum stress positions. Conclusions The FEA suture model can provide more accurate results for heart valve leaflet performance analysis than the contrast model，and offer the guide for the design and the optimization of the valve leaflet shape.

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