arXiv:2603.18559cs.RO2026-03

用一体式柔性结构设计出无需持续用力的微创夹钳,降低制造成本。

TiBCLaG: Hybrid design approach for a trigger-induced bistable compliant laparoscopic grasper

  • 融合解析模型与仿真,设计可储能的柔性触发器和自适应夹头。
  • 3D打印原型实现稳定双稳态夹持,开合性能经实验与仿真验证。
  • 适合微创手术器械轻量化设计,降低零件数量与装配难度。

工业级腹腔镜夹钳依赖多连杆刚性机构,需高精度制造,导致成本高昂。本文提出一种一体化、全柔性、双稳态腹腔镜夹钳的设计与概念验证,无需多个刚性连杆,减少零部件数量。装置集成柔性触发器与柔性夹持端,通过控制推杆耦合,实现无需持续输入即可保持夹持状态。采用解析模型、迭代原型与有限元分析相结合的混合设计方法。触发机构基于两元件梁约束模型,调控I型梁状结构的变形与刚度,实现弹性能量储存并防止突跳失稳。夹持端设计为柔性夹头,通过弹性变形实现自适应抓取。该腹腔镜夹钳采用熔融沉积3D打印技术制造。通过非线性有限元分析与实验对比了钳口开合性能。实体制作原型展现出可靠的双稳态驱动特性,证实了此类柔性腹腔镜夹钳架构的可行性。

原文摘要 · Abstract (English)

Industrial laparoscopic graspers rely on multi-link rigid mechanisms manufactured to tight tolerances, resulting in high manufacturing and assembly costs. This work presents the design and proof-of-concept validation of a monolithic, fully compliant, bistable, laparoscopic grasper that eliminates the need for multiple rigid links, thereby reducing part count. The device integrates a compliant trigger and a compliant gripper end-effector, coupled via a control push-rod, to achieve stable grasping without continuous user input. A hybrid approach combining an analytical model, iterative prototyping, and finite element analyses is employed to design the laparoscopic grasper. The trigger mechanism is synthesized using a Two-Element Beam Constraint Model as a design framework to control the deformation and stiffness of I-beam-like elements. This technique enables elastic energy storage while preventing snap-through instability. The end-effector is designed as a compliant gripper to achieve adaptive grasping through elastic deformation. The laparoscopic design presented here is fabricated using fused deposition 3D printing. A comparative study of the jaws' opening and closing performance is presented using nonlinear finite element analysis and experimentation. The fabricated prototype demonstrates reliable bistable actuation, confirming the feasibility of such compliant laparoscopic grasper architectures.

柔性机构3D打印微创手术双稳态

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