WO2021043001A1 - 用于腔镜切割吻合器的钳口张角机构 - Google Patents

用于腔镜切割吻合器的钳口张角机构 Download PDF

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Publication number
WO2021043001A1
WO2021043001A1 PCT/CN2020/110242 CN2020110242W WO2021043001A1 WO 2021043001 A1 WO2021043001 A1 WO 2021043001A1 CN 2020110242 W CN2020110242 W CN 2020110242W WO 2021043001 A1 WO2021043001 A1 WO 2021043001A1
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Prior art keywords
movable jaw
jaw
push
knife
working position
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PCT/CN2020/110242
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English (en)
French (fr)
Inventor
舒拓
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康奇舒宁(苏州)医疗科技有限公司
舒拓
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Publication of WO2021043001A1 publication Critical patent/WO2021043001A1/zh

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/068—Surgical staplers, e.g. containing multiple staples or clamps
    • A61B17/072—Surgical staplers, e.g. containing multiple staples or clamps for applying a row of staples in a single action, e.g. the staples being applied simultaneously
    • A61B17/07207—Surgical staplers, e.g. containing multiple staples or clamps for applying a row of staples in a single action, e.g. the staples being applied simultaneously the staples being applied sequentially
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/068—Surgical staplers, e.g. containing multiple staples or clamps
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/068—Surgical staplers, e.g. containing multiple staples or clamps
    • A61B17/072—Surgical staplers, e.g. containing multiple staples or clamps for applying a row of staples in a single action, e.g. the staples being applied simultaneously
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/32—Surgical cutting instruments
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/32—Surgical cutting instruments
    • A61B17/320016—Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/03—Automatic limiting or abutting means, e.g. for safety
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/068—Surgical staplers, e.g. containing multiple staples or clamps
    • A61B17/072—Surgical staplers, e.g. containing multiple staples or clamps for applying a row of staples in a single action, e.g. the staples being applied simultaneously
    • A61B2017/07214—Stapler heads
    • A61B2017/07271—Stapler heads characterised by its cartridge
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/068—Surgical staplers, e.g. containing multiple staples or clamps
    • A61B17/072—Surgical staplers, e.g. containing multiple staples or clamps for applying a row of staples in a single action, e.g. the staples being applied simultaneously
    • A61B2017/07214—Stapler heads
    • A61B2017/07285—Stapler heads characterised by its cutter

Definitions

  • the invention belongs to the field of medical equipment, and in particular relates to a jaw opening angle mechanism for an endoscopic cutting stapler.
  • the stapler is used to apply a plurality of suture staples to the physiological tissue of the human body, while correspondingly cutting the physiological tissue.
  • the main working principle is to use titanium nails to anastomize the tissue, similar to a stapler.
  • the stapler usually includes a jaw part at the front end.
  • the jaw part includes a movable jaw, a fixed jaw, a push-knife assembly, and a secondary firing prevention safety device that cooperates with the push-knife assembly.
  • the tail end of the movable jaw is connected to the fixed jaw by rotating around a pivot. , So that the movable jaw has a closed working position and an open working position.
  • the jaw part composed of the movable jaw and the fixed jaw can be assembled by clamping the skin in the closed state, and in the opened state, the jaw returns to the original angle, and the jaw opening angle of the existing endoscopic cutting stapler is reset
  • the movable jaw is released by pulling the knife assembly back to the initial position, and a spring or elastic sheet or similar elastic mechanism is used between the movable jaw and the fixed jaw to push the movable jaw to the initial angle.
  • the elastic mechanism in the above design is easy to deform under pressure.
  • the elastic mechanism supports the movable jaw or the fixed jaw relatively unstable. After the movable jaw opening angle is reset, it is easy to shake when affected by external forces, especially when it enters the human body. In space, the generation of this kind of shaking will increase the difficulty of controlling the jaws; and when the jaws are under too much force, the force applied to the elastic mechanism may cause permanent deformation of the elastic mechanism, and the reset failure of the movable jaw opening angle may occur. problem.
  • the purpose of the present invention is to provide a jaw opening angle mechanism for an endoscope cutting stapler.
  • a jaw opening angle mechanism for an endoscopic cutting stapler the stapler including a jaw part at the front end and a handle at the back;
  • the jaw part It includes a movable jaw, a fixed jaw, a push knife, and a secondary firing prevention safety device matched with the push knife;
  • the tail end of the movable jaw rotates and connects with respect to the fixed jaw around a pivot, so that the movable jaw has a closed working position and Open the working position;
  • the push knife is slidably arranged along its length relative to the fixed jaw;
  • the tail end of the movable jaw is provided with a force receiving part
  • the push knife is provided with a resisting portion corresponding to the force receiving portion, and the resisting portion is located on the front side of the force receiving portion; the connecting line between the force receiving portion and the pivot is connected to the resisting portion.
  • the sliding track of the holding part intersects or the extension lines of the two intersect;
  • the pushing knife can move backwards so that the resisting part abuts against the force-receiving part, so that the movable jaw rotates and opens around the pivot, when the movable jaw is fully rotated to the open working position
  • the anti-secondary firing safety device acts on the push knife to position the push knife, so that the movable jaw remains positioned at the open working position.
  • the tail end of the movable jaw is provided with a cross bar, the cross bar is arranged along the width direction of the movable jaw, and both ends of the cross bar are fixedly connected with the tail end of the movable jaw;
  • the push knife includes a push knife and a connection
  • the push rod at the rear end of the push knife, the back end of the push knife is provided with the resisting portion, and the resisting portion is located between the two ends of the straddling rod, and the front side of the straddling rod is opposite to the resisting part As the force receiving part.
  • the push rod is provided with a limit matching surface corresponding to the cross bar to prevent it from rotating downward, and the limit matching surface is set corresponding to the open working position of the movable jaw; when When the movable jaw is in the open working position, the cross bar abuts against the limit matching surface, thereby restricting the rotation of the movable jaw and avoiding the expansion of the opening angle between the movable jaw and the fixed jaw.
  • the jaw part further includes a connecting piece, the fixed jaw is fixed on the connecting piece, and the movable jaw is hinged to the connecting piece by the pivot; the connecting piece corresponds to the receiving piece.
  • the force part is provided with an escape groove, and when the movable jaw rotates to the open working position, the force receiving part is pressed into the escape groove by the resisting part.
  • the movable jaw is provided with a sliding groove corresponding to the movement track of the pushing knife, and when the movable jaw is in the closed working position and the open working position, the pushing knife can be in the sliding groove Sliding inside.
  • the force-receiving part is designed integrally with the movable jaw. After the instrument is fired, the push knife moves back toward the tail end of the movable jaw, and the resisting part on the push knife resists Lean against the force-receiving part of the tail end of the movable jaw to pivot the movable jaw to the initial position, and then lock and position the push knife through the locking mechanism to maintain its state.
  • This opening method has a simple mechanism and the resisting part abuts On the force-bearing part, there is a rigid contact between the two, which can provide a good limit support for the movable jaw, the opening angle of the movable jaw can be reset and opened stably, and it can be kept without shaking, which is conducive to the precise operation of the jaws during the operation; Compared with the traditional movable jaw that adopts the elastic structure to reset, there is no problem of failure of the elastic mechanism in the previous design.
  • FIG. 1 is a schematic diagram of the three-dimensional structure of the movable jaw in a closed working position according to an embodiment of the present invention
  • Figure 2 is a cross-sectional view of the movable jaw of the embodiment of the present invention in a closed working position
  • Figure 3 is a partial enlarged view of A in Figure 2;
  • FIG. 4 is a schematic diagram of a three-dimensional structure of a movable jaw according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of the structure when the resisting part acts on the force receiving part according to the embodiment of the present invention.
  • Figure 6 is a partial enlarged view of B in 5;
  • Fig. 7 is a schematic structural diagram of the force receiving part being pressed into the avoiding groove according to the embodiment of the present invention.
  • Fig. 8 is a partial enlarged view of C in Fig. 7;
  • FIG. 9 is a schematic diagram of the structure of the push-knife assembly of the embodiment of the present invention.
  • Fig. 10 is a three-dimensional structural diagram of the movable jaw in an open working position according to an embodiment of the present invention.
  • a jaw opening angle mechanism for an endoscope cutting stapler wherein the stapler includes a jaw part at the front end, a push knife assembly 3, and a guard acting on the push knife assembly 3 Secondary firing safety device 5; the jaw part includes a movable jaw 1 and a fixed jaw 2.
  • the movable jaw 1 includes a staple cartridge and a staple cartridge frame, the staple cartridge is embedded in the staple cartridge frame, and the tail end of the movable jaw 1 is around a pivot 11 Rotate and connect relative to the fixed jaw 2 so that the movable jaw 1 has a closed working position and an open working position; the push-knife assembly 3 is slidably arranged relative to the fixed jaw 2 along its length;
  • the tail end of the movable jaw 1 is provided with a force-receiving part 12.
  • a cross bar 13 can be fixed to the tail end of the staple cartridge in the movable jaw 1.
  • the cross bar 13 is arranged along the width direction of the movable jaw 1 and spans Both ends of the rod 13 can be integrally formed with the tail end of the movable jaw 1, and the front side of the rod 13 opposite to the resisting part 31 is used as the force receiving part 12;
  • the push-knife assembly 3 includes a push-knife 32 and a push-knife rod 33 connected to the rear end of the push-knife 32.
  • the back end of the push-knife 32 is provided with a resisting portion 31 corresponding to the force receiving portion 12, and the resisting portion 31 is located on the force receiving portion 12 Front side; the line connecting the force receiving portion 12 and the pivot 11 intersects the sliding track line of the resisting portion 31 or the extension lines of both intersect, that is, the connecting line of the force receiving portion 12 and the pivot 11 and the resisting portion 31
  • the sliding trajectory is arranged at a certain angle;
  • the push knife assembly 3 can be moved backward by operating the handle in the stapler body, and the resisting portion 31 on the push knife assembly 3 can move backward and Resist on the force receiving portion 12, because the connection line between the force receiving portion 12 and the pivot 11 and the sliding track line of the resisting portion 31 are arranged at a certain angle, the force receiving portion 12 drives the movable jaw 1 around the pivot as a whole 11 Rotate so that the movable jaw 1 rotates around the pivot 11 to open.
  • the device 5 acts on the push-knife assembly 3 to position the push-knife assembly 3 so that the movable jaw 1 remains positioned at the open working position.
  • the rear end of the push-knife lever 33 has a card slot to open the anti-secondary firing safety device At 5 o'clock, the safety pin of the anti-secondary firing safety device 5 is stuck in the card slot, thereby restricting the movement of the knife assembly 3;
  • the jaw part corresponding to the tail end of the movable jaw 1 is also provided with a connecting piece 4, wherein the fixed jaw 2 can be fixed to the connecting piece 4 by screws, and the movable jaw 1 is hinged to the connecting piece 4 by a pivot 11, and the connecting piece 4 is hinged on the connecting piece 4.
  • an avoidance groove 41 is opened.
  • the avoidance groove 41 corresponds to the cross rod 13 and is provided with a rotation limit surface 411 that prevents it from continuing to rotate. 13 When the movable jaw 1 is in the open working position, the cross bar 13 is pressed into the avoidance groove 41 and abuts against the rotation limit surface 411 when the movable jaw 1 is in the open working position.
  • the cross bar 13 is clamped between the resisting portion 31 and the rotation limit surface 411, and the parts are in rigid contact, which restricts the movement of the cross bar 13, thereby locking the movable jaw 1, thereby
  • the movable jaw 1 can maintain high stability, and it is difficult to shake during use; at the same time, compared with the traditional movable jaw that adopts the elastic structure to reset, it does not have the problem of failure of the elastic mechanism in the previous design.
  • the movable jaw 1 is provided with a sliding groove 14 corresponding to the movement trajectory line of the pushing knife 32.
  • the pushing knife 32 can slide in the sliding groove 14.
  • the sliding groove 14 The sliding trajectory of the push knife 32 can be restricted to avoid its deviation.

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Abstract

一种用于腔镜切割吻合器的钳口张角机构，活动颚（1）尾端绕一枢轴（11）相对固定颚（2）转动连接，以使活动颚（1）具有一闭合工作位置及张开工作位置；推刀（32）相对固定颚（2）沿其长度方向滑动设置；活动颚（1）的尾端设有一受力部（12），推刀（32）上对应于受力部（12）设有一抵持部（31），抵持部（31）位于受力部（12）的前侧；受力部（12）和枢轴（11）的连线与抵持部（31）的滑动轨迹相交或两者的延长线相交；抵持部（31）抵靠于受力部（12）上，两者之间为刚性接触，能够对活动颚（1）进行良好的限位支撑，活动颚（1）的张角复位打开稳定，并且能够保持无晃动，利于手术过程中精确操作钳口；同时与传统的采用弹性件结构复位的活动颚（1）相比，不存在以往设计中弹性机构失效的问题。

Description

用于腔镜切割吻合器的钳口张角机构 技术领域
本发明属于医疗器械领域，具体涉及一种用于腔镜切割吻合器的钳口张角机构。
背景技术
吻合器用于将多个缝合钉施加到人体的生理组织上，同时相应的对生理组织实施切割，主要工作原理是利用钛钉对组织进行吻合，类似于订书机。
吻合器通常包括前端的钳口部分，钳口部分包括活动颚、固定颚、推刀组件及与推刀组件配合的防二次击发保险装置，活动颚尾端绕一枢轴相对固定颚转动连接，以使活动颚具有一闭合工作位置及张开工作位置。
其中活动颚及固定颚组成的钳口部分，在闭合状态下钳口能够夹紧皮肤组装，张开状态下，钳口恢复至初始角度，现有腔镜切割吻合器的钳口张角的复位在通过推刀组件回拉到初始位释放活动颚，活动颚与固定颚之间使用弹簧或弹性片等类似的弹性机构将活动颚顶开至初始角度。
上述设计中的弹性机构受压易产生形变，弹性机构对活动颚或固定颚的支撑较为不稳定，活动颚张角复位后在受外力影响时容易产生晃动，特别是在其进入人体内的狭小空间时，此种晃动的产生会增加控制钳口难度；且在钳口受力过大时，其施加给弹性机构的力有可能使弹性机构产生永久变形，进而出现活动颚张角复位失效的问题。
发明内容
本发明目的是提供一种用于腔镜切割吻合器的钳口张角机构。
为达到上述目的，本发明采用的技术方案是：一种用于腔镜切割吻合器的钳口张角机构，所述吻合器包括前端的钳口部分以及后部的手柄；所述钳口部分包括活动颚、固定颚、推刀及与推刀配合的防二次击发保险装置；所述活动颚尾端绕一枢轴相对所述固定颚转动连接，以使活动颚具有一闭合工作位置及张开工作位置；所述推刀相对所述固定颚沿其长度方向滑动设置；
所述活动颚的尾端设有一受力部；
所述推刀上对应于所述受力部设有一抵持部，所述抵持部位于所述受力部的前侧；所述受力部和所述枢轴的连线与所述抵持部的滑动轨迹相交或两者的延长线相交；
所述推刀能够向后移动使所述抵持部抵持于所述受力部，以使所述活动颚绕所述枢轴转动张开，当所述活动颚完全转动至张开工作位置时，所述防二次击发保险装置作用于所述推刀将推刀定位住，以使活动颚保持定位在张开工作位置。
上述方案中，所述活动颚尾端设有一横跨杆，该横跨杆沿活动颚宽度方向设置，横跨杆的两端与活动颚尾端固定连接；所述推刀包括推刀以及连接推刀后端的推刀杆，所述推刀后端上设所述抵持部，且所述抵持部位于横跨杆的两端之间，横跨杆的朝前侧与抵持部相对处作为所述受力部。
上述方案中，所述推刀杆上对应于所述横跨杆设有阻止其向下转动的限位配合面，该限位配合面对应于所述活动颚的张开工作位置设置；当所述活动颚处在张开工作位置时，所述横跨杆抵靠于限位配合面上，以此限制所述活动颚的转动，避免其与所述固定颚之间的张角扩大。
上述方案中，所述钳口部分还包括一连接件，所述固定颚固定于连接件上，所述活动颚以所述枢轴铰接于连接件上；所述连接件上对应于所述受力部开设有一避让槽，当所述活动颚转动至张开工作位置时，所述受力部被所述抵持部压入避让槽内。
上述方案中，所述活动颚上对应于所述推刀的运动轨迹开设有滑槽，当所述活动颚处在闭合工作位置及张开工作位置时，所述推刀能够在所述滑槽内滑动。
本发明具有以下效果：本设计中的钳口张角机构，受力部采用与活动颚一体设计，器械击发完成后，推刀回拉朝向活动颚尾端移动，推刀上的抵持部抵靠于活动颚尾端的受力部，以使活动颚绕枢轴转动至初始位置，之后再通过锁定机构对推刀进行锁紧定位，保持其状态，此打开方式机构简单，抵持部抵靠于受力部上，两者之间为刚性接触，能够对活动颚进行良好的限位支撑，活动颚的张角复位打开稳定，并且能够保持无晃动，利于手术过程中精确操作钳口；同时与传统的采用弹性件结构复位的活动颚相比，不存在以往设计中弹性机构失效的问题。
附图说明
图1为本发明实施例的活动颚处在闭合工作位置的立体结构示意图；
图2为本发明实施例的活动颚处在闭合工作位置的剖视图；
图3为图2中A处的局部放大图；
图4为本发明实施例的活动颚立体结构示意图；
图5为本发明实施例的抵持部作用于受力部时的结构示意图；
图6为5中B处的局部放大图；
图7为本发明实施例的受力部被压入避让槽内的结构示意图；
图8为图7中C处的局部放大图；
图9为本发明实施例的推刀组件结构示意图；
图10为本发明实施例的活动颚处在张开工作位置的立体结构示意图。
以上附图中：1-活动颚、11-枢轴、12-受力部、13-横跨杆、14-滑槽、2-固定颚、3-推刀组件、31-抵持部、32-推刀、33-推刀杆、4-连接件、41-避让槽、411-转动限位面、5-防二次击发保险装置。
具体实施方式
下面结合附图及实施例对本发明作进一步描述：
实施例：参见图1-10所示：一种用于腔镜切割吻合器的钳口张角机构，其中吻合器包括前端的钳口部分、推刀组件3及作用于推刀组件3的防二次击发保险装置5；钳口部分包括活动颚1及固定颚2，活动颚1包括钉仓及钉仓架，该钉仓嵌入在钉仓架内，活动颚1尾端绕一枢轴11相对固定颚2转动连接，以使活动颚1具有一闭合工作位置及张开工作位置；推刀组件3相对固定颚2沿其长度方向滑动设置；
活动颚1的尾端设有一受力部12，具体的，可在活动颚1中的钉仓架尾端固定一横跨杆13，该横跨杆13沿活动颚1宽度方向设置，横跨杆13的两端可与活动颚1尾端一体成型，横跨杆13的朝前侧与抵持部31相对处作为受力部12；
推刀组件3包括推刀32及连接于推刀32后端的推刀杆33，推刀32后端上对应于受力部12设有一抵持部31，抵持部31位于受力部12的前侧；受力部12和枢轴11的连线与抵持部31的滑动轨迹线相交或两者的延长线相交，即受力部12和枢轴11的连线与抵持部31的滑动轨迹线呈一定夹角布置；
在活动颚1开始向张角工作位置恢复时，现有技术中可通过操作吻合器本体中的手柄，使推刀组件3向后移动，推刀组件3上的抵持部31向后运动并抵持于受力部12上，由于受力部12和枢轴11的连线与抵持部31的滑动轨迹线呈一定夹角设置，受力部12受力带动活动颚1整体绕枢轴11转动，以使活动颚1绕枢轴11转动张开，当活动颚1完全转动至张开工作位置时，通过操作现有技术中的防二次击发保险装置5，通过防二次击发保险装置5作用于推刀组件3将推刀组件3定位住，以使活动颚1保持定位在张开工作位置，具体的，推刀杆33的尾端有一卡槽，开启防二次击发保险装置5时，防二次击发保险装置5 的保险销卡入卡槽中，以此限制推刀组件3的活动；
钳口部分对应于活动颚1的尾端还设有一连接件4，其中固定颚2可通过螺钉固定于连接件4上，活动颚1以枢轴11铰接于连接件4上，连接件4上对应于横跨杆13开设避让槽41，避让槽41内对应于横跨杆13设有阻止其继续转动的转动限位面411，该转动限位面411可以为避让槽41内与横跨杆13转动轨迹线相交的面，当活动颚1处在张开工作位置时，横跨杆13受到抵持部31的作用，被压入至避让槽41内，抵靠在转动限位面411上，此时横跨杆13被夹持于抵持部31与转动限位面411之间，各部分之间为刚性接触，限制了横跨杆13的活动，以此将活动颚1锁定，从而能够使活动颚1保持较高的稳定性，在使用过程中难以产生晃动；同时与传统的采用弹性件结构复位的活动颚相比，其也不存在以往设计中弹性机构失效的问题。
活动颚1上对应于推刀32的运动轨迹线开设有滑槽14，当活动颚1处在闭合工作位置及张开工作位置时，推刀32能够在滑槽14内滑动，该滑槽14能够限制推刀32的滑动轨迹，避免其产生偏离。
上述实施例只为说明本发明的技术构思及特点，其目的在于让熟悉此项技术的人士能够了解本发明的内容并据以实施，并不能以此限制本发明的保护范围。凡根据本发明精神实质所作的等效变化或修饰，都应涵盖在本发明的保护范围之内。

Claims (5)

  1. 一种用于腔镜切割吻合器的钳口张角机构，所述吻合器包括前端的钳口部分、推刀组件及作用于推刀组件的防二次击发保险装置；所述钳口部分包括活动颚及固定颚，所述活动颚包括钉仓及钉仓架，所述活动颚尾端绕一枢轴相对所述固定颚转动连接，以使所述活动颚具有一闭合工作位置及张开工作位置；所述推刀组件相对所述固定颚沿其长度方向滑动设置；
    其特征在于：所述活动颚的尾端设有一受力部；
    所述推刀组件上对应于所述受力部设有一抵持部，所述抵持部位于所述受力部的前侧；所述受力部和所述枢轴的连线与所述抵持部的滑动轨迹线相交或两者的延长线相交；
    所述推刀组件能够向后移动使所述抵持部抵持于所述受力部，以使所述活动颚绕所述枢轴转动张开，当所述活动颚完全转动至张开工作位置时，所述防二次击发保险装置作用于所述推刀组件将推刀组件定位住，以使所述活动颚保持定位在张开工作位置。
  2. 根据权利要求1所述的钳口张角机构，其特征在于：所述活动颚尾端设有一横跨杆，该横跨杆沿活动颚宽度方向设置，所述横跨杆与活动颚尾端固定连接；所述推刀组件包括推刀及连接于推刀后端的推刀杆，所述推刀后端上设所述抵持部，所述横跨杆的朝前侧与所述抵持部相对处作为所述受力部。
  3. 根据权利要求1或2所述的钳口张角机构，其特征在于：所述钳口部分对应于所述活动颚的尾端还设有一连接件，所述连接件上对应于所述横跨杆开设有一避让槽，所述避让槽内对应于所述横跨杆设有阻止其继续转动的转动限位面，当所述活动颚处在张开工作位置时，所述横跨杆被夹持于所述抵持部与转动限位面之间，以此将所述活动颚锁定。
  4. 根据权利要求3所述的钳口张角机构，其特征在于：所述固定颚固定于所述连接件上，所述活动颚以所述枢轴铰接于连接件上。
  5. 根据权利要求1所述的钳口张角机构，其特征在于：所述活动颚上对应于所述推刀的运动轨迹开设有滑槽，当所述活动颚处在闭合工作位置及张开工作位置时，所述推刀能够在所述滑槽内滑动。
PCT/CN2020/110242 2019-09-06 2020-08-20 用于腔镜切割吻合器的钳口张角机构 WO2021043001A1 (zh)

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