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    Override mechanism for an actuator on a surgical instrument
    5.
    发明授权
    Override mechanism for an actuator on a surgical instrument 失效
    手术器械上的执行器的超驰机构

    公开(公告)号：US5653721A

    公开(公告)日：1997-08-05

    申请号：US545296

    申请日：1995-10-19

    申请人： Bryan D. Knodel ,  Ben Thompson ,  Dale R. Schulze

    发明人： Bryan D. Knodel ,  Ben Thompson ,  Dale R. Schulze

    IPC分类号： A61B17/072 ,  A61B17/28 ,  A61B19/00 ,  A61B17/08

    CPC分类号： A61B17/07207 ,  A61B2017/2923 ,  A61B90/03

    摘要： A surgical instrument which has override protection when excessively thick tissue is attempted to be clamped between opposed jaws of an end effector is disclosed. The instrument includes a frame, a shaft extending from the frame, an end effector connected to the shaft distal end which includes movable, opposed jaws for clamping tissue therebetween, a clamping trigger, a resilient spring element fixed to the trigger, an actuator which translates movement from the clamping trigger to the movable jaws for clamping tissue, and an engaging element which is biased by the spring element against the actuator. When routine forces are applied by the user as the clamping trigger is moved to clamp tissue between the jaws, the engaging element causes the actuator to move in a forward direction for corresponding movement of the jaws from an open to a closed position. If excessive loads are applied, then the resilient spring element is compressed, and the engaging element is correspondingly released from its engagement with the actuator. Accordingly, further movement of the clamping trigger will not cause further translation of the actuator in the forward direction. Therefore, excessive loads are prevented, and the component parts of the instrument will be prevented from breaking. The invention is also applicable to actuators used for other functions such as stapling and cutting tissue.

    摘要翻译： 公开了一种手术器械，当尝试在末端执行器的相对的钳口之间夹紧过厚的组织时具有超驰保护。 仪器包括框架，从框架延伸的轴，连接到轴远端的端部执行器，其包括用于夹紧组织的可移动的相对的夹爪，夹紧触发器，固定到触发器的弹性弹簧元件， 从夹紧扳机到用于夹紧组织的可动爪的运动，以及由弹簧元件抵靠致动器偏压的接合元件。 当夹紧扳机被移动以夹紧夹爪之间的组织时，当用户施加常规力时，接合元件使致动器沿向前方向移动，以使钳口从开放到闭合位置相应移动。 如果施加过大的负载，则弹性弹簧元件被压缩，并且接合元件相应地从与致动器的接合中释放。 因此，夹持扳机的进一步移动不会使致动器在向前方向上进一步平移。 因此，能够防止过大的负荷，能够防止器具的组成部分破裂。 本发明也适用于用于其他功能的致动器，例如缝合和切割组织。