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    Automatic stimulus artifact reduction for accurate analysis of the heart's stimulated response
    1.
    发明授权
    Automatic stimulus artifact reduction for accurate analysis of the heart's stimulated response 失效
    自动刺激伪影减少，以准确分析心脏的刺激反应

    公开(公告)号：US5172690A

    公开(公告)日：1992-12-22

    申请号：US603988

    申请日：1990-10-26

    申请人： Tibor A. Nappholz ,  Fred L. Vance ,  John W. Camerlo ,  Bruce M. Steinhaus ,  Stephen M. Quist ,  Ken Koestner

    发明人： Tibor A. Nappholz ,  Fred L. Vance ,  John W. Camerlo ,  Bruce M. Steinhaus ,  Stephen M. Quist ,  Ken Koestner

    IPC分类号： A61N1/37

    CPC分类号： A61N1/3704

    摘要： An apparatus adapted to be implanted in a patient for electrically stimulating the heart and analyzing the heart's stimulated response, and a method of operating the apparatus, are disclosed. The apparatus operates to reduce the stimulation polarization artifact that normally accompanies such stimulation, allowing accurate measurement of stimulated cardiac potentials. The apparatus is useful in such devices as cardiac pacemakers, tachycardia reversion devices, and defibrillators. Optimizing features are provided to allow the apparatus to function properly in noisy environments and with suboptimal leads. In addition, provision is included to make the apparatus capable of performing self-diagnosis for determining when accurate sensing is not possible.

    摘要翻译： 公开了一种适于植入患者中的用于电刺激心脏并分析心脏刺激的反应的装置，以及操作该装置的方法。 该装置用于减少通常伴随这种刺激的刺激极化伪影，允许精确测量刺激的心脏电位。 该装置在诸如心脏起搏器，心动过速反转装置和除颤器之类的装置中是有用的。 提供优化功能，以使设备在嘈杂的环境和次优引导下正常工作。 此外，包括提供以使该装置能够进行自诊断以确定何时精确的感测是不可能的。

    Polymerization of olefins from catalysts prepared from organo zirconium-chromium compounds
    2.
    发明授权
    Polymerization of olefins from catalysts prepared from organo zirconium-chromium compounds 失效
    从有机锆 - 铬化合物制备的催化剂中聚合烯烃

    公开(公告)号：US4381382A

    公开(公告)日：1983-04-26

    申请号：US269233

    申请日：1981-06-01

    申请人： Randall S. Shipley ,  Fred L. Vance

    发明人： Randall S. Shipley ,  Fred L. Vance

    IPC分类号： C08F10/00 ,  C08F4/02

    CPC分类号： C08F10/00

    摘要： Alpha-Olefins are polymerized in the presence of a catalyst which comprises (A) the reaction product of (1) a tetrahydrocarbyloxy zirconium compound such as tetraisopropoxy zirconium or a tetravalent hydrocarbyloxy zirconium halide such as triisopropoxy zirconium halide with (2) a chromium compound such as CrO.sub.3 ; (B) a solid catalyst support; (C) an organometallic activating agent or cocatalyst and (D) a trivalent or tetravelent titanium compound. The resultant polymers have a high molecular weight and a narrow molecular weight distribution.

    摘要翻译： α-烯烃在催化剂的存在下聚合，该催化剂包含（A）（1）四异氧基锆化合物如四异丙氧基锆或四价烃氧基卤化锆如三异丙氧基卤化锆与（2）铬化合物的反应产物如 作为CrO3; （B）固体催化剂载体; （C）有机金属活化剂或助催化剂和（D）三价或四价钛化合物。 所得聚合物具有高分子量和窄分子量分布。