CN107496024B - 具有夹持力限制器的手术器械 - Google Patents

具有夹持力限制器的手术器械 Download PDF

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CN107496024B
CN107496024B CN201710294304.7A CN201710294304A CN107496024B CN 107496024 B CN107496024 B CN 107496024B CN 201710294304 A CN201710294304 A CN 201710294304A CN 107496024 B CN107496024 B CN 107496024B
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C.J.菲克森
E.J.布恩
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Gyrus ACMI Inc
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Abstract

本发明公开一种钳，其包括第一夹持构件、第二夹持构件、驱动杆组件以及附接到固定柄部的可移动柄部。第一夹持构件和第二夹持构件相对于彼此处于相对关系，并且第一夹持构件和第二夹持构件中的至少一个可从第一打开位置相对移动到当第一夹持构件和第二夹持构件合作以夹牢其间的组织时的第二夹持位置。相对于固定柄部移动可移动柄部使驱动杆组件移动，以便赋予第一夹持构件和第二夹持构件中的至少一个从第一位置和第二位置的移动。可移动柄部具有致动器，其中在第一和第二夹持构件与致动器之间存在空动连接。

Description

具有夹持力限制器的手术器械
技术领域
本公开涉及一种钳。更具体地，本公开涉及一种具有夹持力限制器的钳。
背景技术
该部分中的陈述仅提供与本公开有关的背景技术信息，并且可能不构成现有技术。
通常，钳可用于腹腔镜手术。钳可用于控制患者体内的细微移动，并且可包括具有一对相对的弹性夹持件（jaw）的端部执行器组件，该对相对的弹性夹持件抵靠彼此闭合以抓握组织。此外，钳可利用递送到该对相对的弹性夹持件的电能来凝结或毁坏组织。然而，该设备可产生高夹持力以压缩组织，并且在某些情况下可产生高夹持力以打开夹持件。这些高夹持力可导致端部执行器组件的破坏。
因此，在本领域中需要具有力限制机构的钳，该力限制机构防止由钳的端部执行器赋予的夹紧力超过预定量的力以防止端部执行器的破坏。
发明内容
本发明提供一种具有夹持力限制器的钳。因此，依照本发明的一方面，一种钳包括第一夹持构件、第二夹持构件、驱动杆组件以及附接到固定柄部的可移动柄部。所述第一夹持构件和所述第二夹持构件相对于彼此处于相对关系，并且所述第一夹持构件和所述第二夹持构件中的至少一个可从当所述第一夹持构件和所述第二夹持构件相对于彼此按间隔关系布置时的第一打开位置相对移动到当所述第一夹持构件和所述第二夹持构件合作以夹牢其间的组织时的第二夹持位置。相对于所述固定柄部移动所述可移动柄部使所述驱动杆组件移动，以便赋予所述第一夹持构件和所述第二夹持构件中的至少一个从所述第一位置和所述第二位置的移动。所述可移动柄部具有致动器，其中在所述第一和第二夹持构件与所述致动器之间存在空动连接（lost motion connection）。所述空动连接包括在所述可移动柄部的端部上的轭状物和驱动梭（shuttle）。所述轭状物包括凸缘，并且所述驱动梭被构造成使得如果赋予在所述驱动杆组件上的力超过预定量的力，则所述轭状物的所述凸缘向外偏转以允许在所述轭状物与所述梭之间的相对轴向运动，这允许在所述可移动柄部与所述固定柄部之间的相对移动、而所述第一夹持构件不相对于所述第二夹持构件移动。
本发明的前述方面可进一步特征在于本文中所述特征中的一个或任意组合，诸如：所述轭状物和所述梭中的至少一个具有锥形表面，所述锥形表面使得所述轭状物和所述梭中的所述至少一个能够从所述轭状物和所述梭中的另一个脱离；所述轭状物和所述梭中的所述至少一个在所述轭状物和所述梭中的所述至少一个的前部和后部上具有锥形表面，所述锥形表面使得所述轭状物和所述梭中的所述至少一个能够从所述轭状物和所述梭中的另一个脱离；当所述可移动柄部朝向所述固定柄部移动时，所述驱动杆组件使所述第一夹持构件和所述第二夹持构件中的至少一个朝向所述第二夹持位置移动；所述空动连接允许所述可移动柄部远离所述固定柄部移动、而所述第一夹持构件不相对于所述第二夹持构件移动，以便当所述可移动柄部远离所述固定柄部移动时，所述第一夹持构件和所述第二夹持构件不朝向所述第一打开位置移动；所述空动连接允许所述可移动柄部朝向所述固定柄部移动、而所述第一夹持构件不相对于所述第二夹持构件移动，以便当所述可移动柄部朝向所述固定柄部移动时，所述第一夹持构件和所述第二夹持构件不朝向所述第二夹持位置移动；所述第一夹持构件和所述第二夹持构件各自包括密封表面，每个密封表面被构造成连接到电手术能量源；以及所述源生成电手术能量以凝结夹牢在所述第一夹持构件与所述第二夹持构件之间的组织。
因此，依照本发明的另一方面，一种钳包括第一夹持构件、第二夹持构件、驱动器杆组件、附接到固定柄部的可移动柄部、以及提供使所述可移动柄部被偏压成远离所述固定柄部的偏压力的恢复构件。所述第一夹持构件和所述第二夹持构件相对于彼此处于相对关系，并且所述第一夹持构件和所述第二夹持构件可从当所述第一夹持构件和所述第二夹持构件相对于彼此按间隔关系布置时的第一打开位置相对移动到当所述第一夹持构件和所述第二夹持构件合作以夹牢其间的组织时的第二夹持位置。相对于所述固定柄部移动所述可移动柄部使所述驱动杆组件移动，以便赋予所述第一夹持构件和所述第二夹持构件在第一位置和所述第二位置之间的移动。所述可移动柄部具有致动器，其中在所述第一和第二夹持构件与所述致动器之间存在空动连接。所述空动连接将所述偏压力传递到所述可移动柄部以使所述可移动柄部远离所述固定柄部返回，以便使所述第一夹持构件和所述第二夹持构件维持在所述第二夹持位置中。
本发明的前述方面可进一步特征在于本文中所述特征中的一个或任意组合，诸如：所述空动连接包括在所述可移动柄部的端部上的轭状物和驱动梭，所述轭状物包括凸缘，并且所述驱动梭被构造成使得如果赋予在所述驱动杆组件上的力超过预定量的力，则所述轭状物的所述凸缘向外偏转以允许在所述轭状物与所述梭之间的相对轴向运动，这允许在所述可移动柄部与所述固定柄部之间的相对移动、而所述第一夹持构件不相对于所述第二夹持构件移动；所述轭状物和所述梭中的至少一个具有锥形表面，所述锥形表面使得所述轭状物和所述梭中的所述至少一个能够从所述轭状物和所述梭中的另一个脱离；所述轭状物和所述梭中的所述至少一个在所述轭状物和所述梭中的所述至少一个的前部和后部上具有锥形表面，所述锥形表面使得所述轭状物和所述梭中的所述至少一个能够从所述轭状物和所述梭中的另一个脱离；当所述可移动柄部朝向所述固定柄部移动时，所述驱动杆组件使所述第一夹持构件和所述第二夹持构件中的至少一个朝向所述第二夹持位置移动；所述空动连接允许所述可移动柄部远离所述固定柄部移动、而所述第一夹持构件不相对于所述第二夹持构件移动，以便当所述可移动柄部远离所述固定柄部移动时，所述第一夹持构件和所述第二夹持构件不朝向所述第一打开位置移动；所述空动连接允许所述可移动柄部朝向所述固定柄部移动、而所述第一夹持构件不相对于所述第二夹持构件移动，以便当所述可移动柄部朝向所述固定柄部移动时，所述第一夹持构件和所述第二夹持构件不朝向所述第二夹持位置移动；所述第一夹持构件和所述第二夹持构件各自包括密封表面，每个密封表面被构造成连接到电手术能量源；以及所述源生成电手术能量以凝结夹牢在所述第一夹持构件与所述第二夹持构件之间的组织。
因此，依照本发明的又一方面，一种使用钳的方法包括以下步骤中的一个或多个：相对于所述钳的固定柄部使可移动柄部移动，以夹牢在所述钳的第一夹持构件和第二夹持构件之间的组织，所述第一夹持构件和所述第二夹持构件相对于彼此处于相对关系，所述第一夹持构件和所述第二夹持构件可从当所述第一夹持构件和所述第二夹持构件相对于彼此按间隔关系布置时的第一打开位置相对移动到当所述第一夹持构件和所述第二夹持构件合作以夹牢其间的组织时的第二夹持位置；以及相对于所述固定柄部使所述可移动柄部移动以释放所述组织。相对于所述固定柄部移动所述可移动柄部使驱动杆组件移动，以便赋予所述第一夹持构件和所述第二夹持构件在所述第一位置与所述第二位置之间的移动。所述可移动柄部具有致动器，其中在所述第一和第二夹持构件与所述致动器之间存在空动连接。所述空动连接包括在所述可移动柄部的端部上的轭状物和驱动梭。所述轭状物包括凸缘，并且所述驱动梭被构造成使得如果赋予在所述驱动杆组件上的力超过预定量的力，则所述轭状物的所述凸缘向外偏转以允许在所述轭状物与所述梭之间的相对轴向运动，这允许在所述可移动柄部与所述固定柄部之间的相对移动、而所述第一夹持构件不相对于所述第二夹持构件移动。
使用所述钳的方法可进一步特征在于以下特征中的一个或任意组合：所述轭状物和所述梭中的至少一个具有锥形表面，所述锥形表面使得所述轭状物和所述梭中的所述至少一个能够从所述轭状物和所述梭中的另一个脱离；所述轭状物和所述梭中的所述至少一个在所述轭状物和所述梭中的所述至少一个的前部和后部上具有锥形表面，所述锥形表面使得所述轭状物和所述梭中的所述至少一个能够从所述轭状物和所述梭中的另一个脱离；当所述可移动柄部朝向所述固定柄部移动时，所述驱动杆组件使所述第一夹持构件朝向所述第二夹持构件移动；所述空动连接允许所述可移动柄部远离所述固定柄部移动、而所述第一夹持构件不相对于所述第二夹持构件移动，以便当所述可移动柄部远离所述固定柄部移动时，所述第一夹持构件和所述第二夹持构件不朝向所述第一打开位置移动；所述空动连接允许所述可移动柄部朝向所述固定柄部移动、而所述第一夹持构件不相对于所述第二夹持构件移动，以便当所述可移动柄部朝向所述固定柄部移动时，所述第一夹持构件和所述第二夹持构件不朝向所述第二夹持位置移动；所述第一夹持构件和所述第二夹持构件各自包括密封表面，每个密封表面被构造成连接到电手术能量源；以及所述源生成能量以凝结夹牢在所述第一夹持构件与所述第二夹持构件之间的组织。
根据本文中提供的描述，其它特征、优点和适用范围将变得显而易见。应理解，描述和具体实例仅旨在为了说明目的，并且并不旨在限制本公开的范围。
附图说明
本文中所描述的附图仅为了说明目的，并且不旨在以任何方式限制本公开的范围。附图的部件未必按比例绘制，而是将重点放在示出本发明的原理上。在附图中：
图1是根据本发明的原理的钳的透视图；
图2是图1中所示钳的内部视图；
图3是图1中所示钳的展开视图；
图4是用于图1中所示钳的上夹持件和滑块子组件的展开视图；
图4A是图4中所示区域4A的特写视图；
图5是图4中所示上夹持件的侧视图；
图6是图5中所示上夹持件的横截面视图；
图7是探头子组件的侧视图；
图8A是与连接器子组件组合的图7中所示探头子组件的展开视图；
图8B是图8A中所示探头子组件和连接器子组件的侧视图；
图8C是上夹持件和探头的特写侧视图；并且
图9是用于图1中所示钳的手持件的横截面视图。
具体实施方式
以下描述本质上仅是示例性的，并且不旨在限制本公开、应用或用途。
参考图1，在此示出并在10处指出体现本发明的原理的仪器。在某些构造中，仪器10是用于密封、凝结或切割组织的双极钳。仪器10可在手术期间用于抓握感兴趣的特征，包括身体的一部分、解剖特征、组织、静脉、动脉或其组合。
电流可通过钳10，以使该钳用于电手术。例如，当组织位于夹持件内时治疗电流可从一个夹持件传递到第二夹持件，并且该治疗电流可凝结血液、烧灼、切割或其组合。钳10可大体包括一个或多个工作组件和用于使该一个或多个组件工作的足够控制器。钳2可包括用于实施所述功能的零件，并且可大体包括探针（例如，管状构件、中空管或管组件）、手持件、用于致动该探针的一个或多个可操作机构或其组合。手持件可以是能够与空腔形成手持件结构的零件或外壳结构的组件。注意的是，本发明并不限于腹腔镜手术。即，下文所述的夹持件可与夹紧到组织上的任何类型的医疗设备一起使用。
现在转向图1，钳10包括手持件12和护套构件18，护套构件18的近侧部分采用连接器旋钮22连接到手持件12。在各种布置中，护套构件18可以是具有热收缩的外管。端部执行器单元28从护套构件18的远侧部分26延伸。手持件12包括被构造成相对于固定柄部14移动的可移动柄部16。手持件12还包括第一开关按钮32和第二开关按钮30。
进一步参考图2和图3，钳10包括与第一和第二开关按钮30和32电通信的柔性电路50。柔性电路50继而与电连接到电手术能量源13的接触开关电路52电通信。当第二开关按钮30被按下时，能量源13被激发以向端部执行器28供应能量，从而凝结由端部执行器28夹牢的组织。并且当第一开关按钮32被按下时，其激发电手术能量源13以向端部执行器28供应足够电手术或超声波能量，从而切割和密封由端部执行器28夹牢的组织。
钳10包括与可移动柄部16相关联的致动器34。致动器34包括滑块48、定位在滑块48周围的偏压构件44（诸如弹簧）、以及也定位在滑块48周围的梭42。可移动柄部16包括具有轭状物58的延伸部56。轭状物58与梭42接合，并且轭状物58和梭42共同在致动器34与端部执行器28之间形成下文更详细描述的空动连接。朝向固定柄部14挤压可移动柄部16使梭42向远侧（即，朝向端部执行器28）移动。梭42的该移动抵靠放大的凸缘60（例如，参考图4）压缩弹簧构件44，以使滑块48也向远侧移动。
还参考图4、图4A、图5和图6，滑块48连接到布置在护套构件18内的管状构件或内管19，并被构造成使得管状构件19能够在护套构件18内往复运动，并且因此，充当驱动杆组件以使端部执行器28打开并使端部执行器28闭合到夹持位置。该驱动杆可以是中空轴；因此，该驱动杆组件可充当推动管组件或驱动器管组件。护套构件18包括连接器61，并且固持器62位于连接器61内。端部执行器28包括采用一组销70和72附接到连接器61的第一夹持构件，诸如上夹持构件68。更具体地，该组销70和72延伸穿过连接器61中的一对孔73并穿过上夹持构件68的一对孔71。销70的内端部与固持器62的相应槽63接合。销76使管状构件19的端部接合到上夹持构件68。因此，管状构件19向远侧的移动致使管状构件19推压销76，销76继而推压上夹持构件68以使上夹持构件68围绕销70和72向下枢转到夹持位置。固持器62在护套18内保持固定并帮助保持远侧构件86（图7）在管状构件19中居中。固持器62由绝缘材料（诸如例如，塑料）制成以确保远侧构件86和管状构件19彼此电隔离。电极64采用销或轴74附接到上夹持构件68的底部并且电连接到能量源13，以使电极64充当密封表面。
现在转向图7，钳10进一步包括子组件构件80，子组件构件80的内轴83被容纳在内护套84内。内轴83连接到放大的近侧端部82并且在轴83的远侧端部处连接到远侧构件86。远侧构件86可以是探头、第二夹持构件、或探头和第二夹持构件两者。在各种布置中，远侧构件86接收由源13递送的超声波能量，以使远侧构件充当切割元件。远侧构件86可充当具有密封表面的电极。因此，如果上夹持构件68包括电极64并且远侧构件86包括电极，则端部执行器28充当双极钳的相反电极。
如图8A中所示的，放大的近侧端部82被容纳在两件式探头固持器90A和90B中。细长的电触头92A和92B定位于探头固持器90A和90B的外侧并且电连接到电源13。如图8A中进一步所示的，内轴83和内护套84定位于管状构件19内，并且被构造成允许管状构件19在内护套84上往复运动。
还参考图8B，两件式探头固持器90A和90B包括与手持件12内的一组肋46（例如，参考图2）中的一个接合的放大凸缘96。因此，探头子组件构件80在手持件12内保持固定，而滑块48、弹簧44和梭42能够相对于子组件80平移。
现在参考图9，滑块48包括凸缘60。第二偏压构件45（诸如弹簧）定位于凸缘60与连接器旋钮22的直径减小区域的表面104之间。因此，可移动柄部16朝向固定柄部14的移动导致轭状物58向远侧移动。由于轭状物58与梭42接合，因此轭状物58的远侧移动推动梭42，梭42抵靠滑块凸缘60压缩弹簧44，弹簧44继而使滑块48向远侧移动。滑块48的远侧移动在表面104与凸缘60之间压缩弹簧45。由于管状构件19连接到滑块48，因此滑块48的移动导致管状构件19在护套18内并在内护套84上的移动。并且，如先前描述的，由于管状构件19与销76接合，因此管状构件19的远侧移动导致销76的远侧移动，这导致上夹持构件68向下枢转到闭合的夹持位置。为打开端部执行器28，可移动柄部16远离固定柄部14移动。更具体地，柄部16远离固定柄部14的移动导致梭42向近侧移动，这允许弹簧44扩展以减小滑块48的凸缘60上的压缩力。因此，弹簧45也能够伸展以推压凸缘60，这导致滑块48的近侧移动。如上文所论述的，由于滑块48连接到端部执行器28，因此滑块48的近侧移动导致上夹持构件向上枢转到打开位置。进一步应注意，在钳10的某些布置中，弹簧45充当在可移动柄部16上提供远离固定柄部14的偏压力的恢复构件。具体地，空动连接（即，轭状物58和梭42）将偏压力传递到可移动柄部16以使可移动柄部16远离固定柄部14返回，以便使上夹持构件68和远侧构件86保持在闭合的夹持位置中。
在钳10的使用期间，赋予在端部执行器28上的过多夹紧力可导致端部执行器28的破坏。尤其，该力可导致销70和72或74和76从上夹持构件68脱落或脱离。先前所述的空动连接防止该破坏发生。梭42包括远侧凸缘100和近侧凸缘102。在当可移动柄部16朝向固定柄部14挤压时端部执行器28的夹紧力变得过多之前，远侧凸缘100允许轭状物58搭扣（snap）在梭42上，如由箭头110所指示的。即，如果由驱动杆组件赋予的夹紧力超过预定量的力，则轭状物58的远侧凸缘100向外偏转以允许在轭状物58与梭42之间实现相对轴向移动，这允许在可移动柄部16与固定柄部14之间的相对移动、而上夹持构件68不相对于远侧构件86移动。
类似地，当可移动柄部16远离固定柄部14移动时在打开端部执行器28时过多力可发生。因此，如果由驱动杆组件赋予的打开力超过预定量的力，则轭状物58的近侧凸缘102向外偏转以使得轭状物58能够搭扣在梭42上，这再次允许在轭状物58与梭42之间的相对轴向移动，同时允许在可移动柄部16与固定柄部14之间的相对移动、而上夹持构件68不相对于远侧构件86移动。
总而言之，空动连接允许可移动柄部16远离固定柄部14移动、而上夹持构件68不相对于远侧构件86移动，以便当可移动柄部16远离固定柄部14移动时，上夹持构件68和远侧构件86并不朝向打开位置移动。此外，空动连接允许可移动柄部16朝向固定柄部14移动、而上夹持构件68不相对于远侧构件86移动，以便当可移动柄部16朝向固定柄部14移动时，上夹持构件68和远侧构件86并不朝向闭合夹持位置移动。在某些布置中，凸缘100或102或者其两者可如图9中所示分别包括锥形表面101和103以进一步增强轭状物58与梭42之间的脱离，以便防止驱动杆组件在端部执行器28上赋予过多力。
本发明的描述本质上仅是示例性的，并且不偏离本发明的主旨的变型旨在在本发明的范围内。这样的变型不将视为偏离本发明的精神和范围。

Claims (13)

1.一种钳，其包括：
第一夹持构件；
第二夹持构件，所述第一夹持构件和所述第二夹持构件相对于彼此处于相对关系，所述第一夹持构件和所述第二夹持构件中的至少一个可从当所述第一夹持构件和所述第二夹持构件相对于彼此按间隔关系布置时的第一打开位置相对移动到当所述第一夹持构件和所述第二夹持构件合作以夹牢其间的组织时的第二夹持位置；
驱动杆组件；以及
附接到固定柄部的可移动柄部，相对于所述固定柄部移动所述可移动柄部使所述驱动杆组件移动，以便赋予所述第一夹持构件和所述第二夹持构件中的至少一个从所述第一位置和所述第二位置的移动，所述可移动柄部具有致动器，其中在所述第一和第二夹持构件与所述致动器之间存在空动连接，
其中所述空动连接包括驱动梭和在所述可移动柄部的端部上的轭状物，所述轭状物包括凸缘，并且所述驱动梭被构造成使得如果赋予在所述驱动杆组件上的力超过预定量的力，则所述轭状物的所述凸缘向外偏转以允许在所述轭状物与所述梭之间的相对轴向运动，这允许在所述可移动柄部与所述固定柄部之间的相对移动、而所述第一夹持构件不相对于所述第二夹持构件移动。
2.根据权利要求1所述的钳，其中，所述轭状物和所述梭中的至少一个具有锥形表面，所述锥形表面使得所述轭状物和所述梭中的所述至少一个能够从所述轭状物和所述梭中的另一个脱离。
3.根据权利要求2所述的钳，其中，所述轭状物和所述梭中的所述至少一个在所述轭状物和所述梭中的所述至少一个的前部和后部上具有锥形表面，所述锥形表面使得所述轭状物和所述梭中的所述至少一个能够从所述轭状物和所述梭中的另一个脱离。
4.根据前述权利要求中的任一项所述的钳，其中，当所述可移动柄部朝向所述固定柄部移动时，所述驱动杆组件使所述第一夹持构件和所述第二夹持构件中的至少一个朝向所述第二夹持位置移动，并且其中如果赋予所述驱动杆组件上的力超过预定的力，则所述空动连接允许所述可移动柄部远离所述固定柄部移动、而所述第一夹持构件不相对于所述第二夹持构件移动，以便当所述可移动柄部远离所述固定柄部移动时，所述第一夹持构件和所述第二夹持构件不朝向所述第一打开位置移动。
5.根据权利要求1-3中的任一项所述的钳，其中，当所述可移动柄部朝向所述固定柄部移动时，所述驱动杆组件使所述第一夹持构件和所述第二夹持构件中的至少一个朝向所述第二夹持位置移动，并且其中如果赋予所述驱动杆组件上的力超过预定的力，则所述空动连接允许所述可移动柄部朝向所述固定柄部移动、而所述第一夹持构件不相对于所述第二夹持构件移动，以便当所述可移动柄部朝向所述固定柄部移动时，所述第一夹持构件和所述第二夹持构件并朝向所述第二夹持位置移动。
6.根据权利要求1-3中的任一项所述的钳，其中，当所述可移动柄部朝向所述固定柄部移动时，所述驱动杆组件使所述第一夹持构件和所述第二夹持构件中的至少一个朝向所述第二夹持位置移动，并且其中如果赋予所述驱动杆组件上的力超过预定的力，则所述空动连接允许所述可移动柄部远离所述固定柄部移动、而所述第一夹持构件不相对于所述第二夹持构件移动，以便当所述可移动柄部远离所述固定柄部移动时，所述第一夹持构件和所述第二夹持构件不朝向所述第一打开位置移动，并且其中如果赋予所述驱动杆组件上的力超过预定的力，则所述空动连接允许所述可移动柄部朝向所述固定柄部移动、而所述第一夹持构件不相对于所述第二夹持构件移动，以便当所述可移动柄部朝向所述固定柄部移动时，所述第一夹持构件和所述第二夹持构件不朝向所述第二夹持位置移动。
7.一种钳，其包括：
第一夹持构件；
第二夹持构件，所述第一夹持构件和所述第二夹持构件相对于彼此处于相对关系，所述第一夹持构件和所述第二夹持构件可从当所述第一夹持构件和所述第二夹持构件相对于彼此按间隔关系布置时的第一打开位置相对移动到当所述第一夹持构件和所述第二夹持构件合作以夹牢其间的组织时的第二夹持位置；
驱动杆组件；
附接到固定柄部的可移动柄部，相对于所述固定柄部移动所述可移动柄部使所述驱动杆组件移动，以便赋予所述第一夹持构件和所述第二夹持构件在所述第一位置与所述第二位置之间的移动，所述可移动柄部具有致动器，其中在所述第一和第二夹持构件与所述致动器之间存在空动连接；以及
恢复构件，其提供使所述可移动柄部被偏压成远离所述固定柄部的偏压力，所述空动连接将所述偏压力传递到所述可移动柄部以使所述可移动柄部远离所述固定柄部返回，以便使所述第一夹持构件和所述第二夹持构件维持在所述第二夹持位置中；
其中，所述空动连接包括驱动梭和在所述可移动柄部的端部上的轭状物，所述轭状物包括凸缘，并且所述驱动梭被构造成使得如果赋予在所述驱动杆组件上的力超过预定量的力，则所述轭状物的所述凸缘向外偏转以允许在所述轭状物与所述梭之间的相对轴向运动，这允许在所述可移动柄部与所述固定柄部之间的相对移动、而所述第一夹持构件不相对于所述第二夹持构件移动。
8.根据权利要求7所述的钳，其中，所述轭状物和所述梭中的至少一个具有锥形表面，所述锥形表面使得所述轭状物和所述梭中的所述至少一个能够从所述轭状物和所述梭中的另一个脱离。
9.根据权利要求8所述的钳，其中，所述轭状物和所述梭中的所述至少一个在所述轭状物和所述梭中的所述至少一个的前部和后部上具有锥形表面，所述锥形表面使得所述轭状物和所述梭中的所述至少一个能够从所述轭状物和所述梭中的另一个脱离。
10.根据权利要求7-9中的任一项所述的钳，其中，当所述可移动柄部朝向所述固定柄部移动时，所述驱动杆组件使所述第一夹持构件和所述第二夹持构件中的至少一个朝向所述第二夹持位置移动。
11.根据权利要求10所述的钳，其中，如果赋予所述驱动杆组件上的力超过预定的力，则所述空动连接允许所述可移动柄部远离所述固定柄部移动、而所述第一夹持构件不相对于所述第二夹持构件移动，以便当所述可移动柄部远离所述固定柄部移动时，所述第一夹持构件和所述第二夹持构件不朝向所述第一打开位置移动。
12.根据权利要求10所述的钳，其中，如果赋予所述驱动杆组件上的力超过预定的力，则所述空动连接允许所述可移动柄部朝向所述固定柄部移动、而所述第一夹持构件不相对于所述第二夹持构件移动，以便当所述可移动柄部朝向所述固定柄部移动时，所述第一夹持构件和所述第二夹持构件不朝向所述第二夹持位置移动。
13.根据权利要求10所述的钳，其中，如果赋予所述驱动杆组件上的力超过预定的力，则所述空动连接允许所述可移动柄部远离所述固定柄部移动、而所述第一夹持构件不相对于所述第二夹持构件移动，以便当所述可移动柄部远离所述固定柄部移动时，所述第一夹持构件和所述第二夹持构件不朝向所述第一打开位置移动，并且其中如果赋予所述驱动杆组件上的力超过预定的力，则所述空动连接允许所述可移动柄部朝向所述固定柄部移动、而所述第一夹持构件不相对于所述第二夹持构件移动，以便当所述可移动柄部朝向所述固定柄部移动时，所述第一夹持构件和所述第二夹持构件不朝向所述第二夹持位置移动。
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