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首页> 外文学位 >Design of a rotary control valve for an electrohydraulic ventricular assist device.
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Design of a rotary control valve for an electrohydraulic ventricular assist device.

机译：用于电动液压心室辅助装置的旋转控制阀的设计。

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摘要

Mechanical circulatory assist devices are grouped in two major classes: pulsatile, in which the blood flow rate is unsteady and similar to the natural circulatory system, and non-pulsatile, in which the blood is pumped at a steady flow rate. Ventricular assist devices or VADs assist the natural heart in pumping the blood and are therefore often pulsatile. One possibility in designing such a device is to create the pulsatile flow by alternately emptying and filling a chamber in a manner similar to the function of the natural heart. This thesis examines the design of a rotary valve intended for use in hydraulically actuated VADs that will create an oscillating flow to empty and fill the VAD chamber from a unidirectional hydraulic pump. Note that in these devices the hydraulic fluid and the blood are separated by a flexible membrane. The valve contains a rotating element whose angular velocity is determined by the speed of the axial flow pump and appropriately sized annular gaps. This rotating element is then used to switch the flow between two sets of inlet and exit ports on the valve, one set causes the hydraulic fluid to fill the VAD chamber and the second causes the chamber to empty. Important aspects of the design include its energy efficiency, its simplicity and reliability, and a reduction in the number of parts exposed to alternating mechanical loads. A prototype of the design is described and preliminary tests described in the thesis show promising performance. The prototype was constructed to test both the feasibility of the concept and the feasibility of implementing the valve under the size and other constraints used in the design of VADs at the Cardiovascular Devices Division of the University of Ottawa Heart Institute. (Abstract shortened by UMI.)
机译：机械循环辅助设备分为两大类：脉动式和非脉动式，其中血液流速不稳定并且类似于自然循环系统；非搏动式中的血液流速稳定。心室辅助设备或VAD辅助自然心脏泵血，因此通常具有搏动性。设计这种设备的一种可能性是通过以类似于天然心脏功能的方式交替地排空和填充腔室来产生脉动流。本文研究了用于液压致动VAD的旋转阀的设计，该阀将产生振荡流以从单向液压泵排空VAD腔并充满VAD腔。注意，在这些设备中，液压流体和血液通过柔性膜分开。阀包含一个旋转元件，其角速度由轴流泵的速度和适当大小的环形间隙确定。然后，使用该旋转元件在阀的两组进口和出口之间切换流量，其中一组使液压油充满VAD腔，第二组使VAD腔充满。设计的重要方面包括其能效，其简单性和可靠性以及减少承受交替机械载荷的零件数量。描述了该设计的原型，并且论文中描述的初步测试显示了有希望的性能。在渥太华大学心脏研究所心血管设备分部，在设计用于VAD的尺寸和其他限制条件下，测试原型的构想，以测试该概念的可行性以及实施瓣膜的可行性。 （摘要由UMI缩短。）

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  • 作者

    Pinder, Shane Donald.;

  • 作者单位

    Carleton University (Canada).;

  • 授予单位 Carleton University (Canada).;
  • 学科 Engineering Biomedical.
  • 学位 M.Eng.
  • 年度 1996
  • 页码 82 p.
  • 总页数 82
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生物医学工程;
  • 关键词

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