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1. 发明授权

US5603333A Impedance catheter and catheterization system in which it is used for measuring the electrical impedance in blood vessels 失效
标题翻译：阻抗导管和导管系统，用于测量血管中的电阻抗
公开(公告)号：US5603333A
公开(公告)日：1997-02-18
申请号：US481423
申请日：1995-09-06
申请人： Maurits K. Konings
发明人： Maurits K. Konings
IPC分类号： A61B5/05 , A61B5/053 , G06F15/42
CPC分类号： A61B5/0537 , A61B5/02007 , A61B5/0538 , A61B5/4872
摘要： Method of operating, catheter and catherization system for measuring electrical impedances in blood vessels, within a annular area around the catheter. The catheter contains excitation electrodes, between which the impedance is measured through a potential difference between measuring electrodes present between those electrodes.Around the catheter a pattern of electrical field lines is created, a so-called counter current field, by varying the amplitude of the currents it being provided that between the measuring electrodes no or hardly any current runs and that at a larger distance of the measuring electrodes the electrical field lines are mainly perpendicular to the longitudinal axis of the catheter. The average impedance of the area to be measured and that of the area outside this will be measured separately. The current intensities then will be chosen such that their relation deviates from the one, at which there is no current between the measuring electrodes--the quenching relation--respectively by adjusting exactly on the quenching relation.
摘要翻译： PCT No.PCT / EP94 / 00019 Sec。 371日期：1995年9月6日 102（e）日期1995年9月6日PCT 1994年1月5日PCT PCT。第WO94 / 15529号公报日期1994年7月21日在导管周围的环形区域内用于测量血管中电阻抗的导管和导管系统的操作方法。导管包含激励电极，其间通过存在于这些电极之间的测量电极之间的电势差来测量阻抗。在导管周围，产生电场线的图案，即所谓的逆流场，通过改变所提供的电流的幅度，测量电极之间不存在或几乎没有任何电流运行，以及在测量的较大距离处电场线主要垂直于导管的纵向轴线。要测量的区域的平均阻抗和此外的区域的平均阻抗将单独测量。然后选择电流强度，使得它们的关系偏离测量电极之间没有电流的关系 - 淬灭关系，分别通过精确调整淬火关系。

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