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    • 7. 发明授权
    • Curved cannula
    • 弯曲插管
    • US08343045B2
    • 2013-01-01
    • US12780724
    • 2010-05-14
    • Charles E. SwinehartTheodore W. Rogers
    • Charles E. SwinehartTheodore W. Rogers
    • A61B1/00
    • B21D21/00A61B17/00234A61B17/3421A61B2017/2904A61B2090/062Y10T29/49
    • The cross section of a curved portion of a curved cannula is oval shaped. The oval is oriented such that a major axis of the oval is generally aligned with the curved portion's bend radius. In one aspect, the cannula tube is ovalized so that the radius of curvature of an interior wall approaches the outer radius of an instrument component that contacts the curved portion during instrument insertion. In this first aspect, a wider contact patch area between the instrument component and the cannula results, which reduces friction and stick-slip during insertion. In another aspect, the cannula tube is ovalized so that the radius of curvature of an interior wall is less than the outer radius of an instrument component that contacts the curved portion during instrument insertion. In this second aspect, two contact patches are established between the instrument component and cannula, which also reduces friction and stick-slip during instrument insertion. Also disclosed is a cannula orientation marking that changes circumferential orientation along a length the curved cannula to help a person who is inserting the cannula to properly twist the cannula during insertion.
    • 弯曲插管的弯曲部分的横截面为椭圆形。 椭圆形被定向为使得椭圆的长轴通常与弯曲部分的弯曲半径对准。 在一个方面,插管管是椭圆形的,使得内部壁的曲率半径在仪器插入期间接近与弯曲部分接触的器械部件的外半径。 在该第一方面,仪器部件和套管之间的更宽的接触面积导致插入期间的摩擦和粘滑。 在另一方面,插管管是椭圆形的,使得内壁的曲率半径小于在仪器插入期间接触弯曲部分的器械部件的外半径。 在该第二方面,在仪器部件和插管之间建立两个接触片,这也在仪器插入期间减少摩擦和粘滑。 还公开了套管取向标记,其沿着弯曲插管的长度改变周向定向,以帮助插入套管的人在插入期间适当地扭转套管。