一种刚柔结合骨折复位机器人的设计与分析

      Design and Analysis of a Rigid-Flexible Combined Fracture Reduction Robot

      • 摘要: 针对微创闭合复位髓内钉内固定术的技术瓶颈,提出一种刚柔结合微创骨折复位机器人,利用软体材料的柔顺接触特性和连续变形能力,在保证复位精度的同时,满足骨折复位过程的柔顺性和安全性。同时,基于人体下肢解剖学和生理学特性,在考虑骨折部位肌肉等软组织存在的情况下,研制了一套股骨干骨折模型。最后,根据临床手术复位操作流程,利用骨折复位机器人对骨折模型开展复位模拟实验,最大成角误差为0.6°,最大平移残余为1.0 mm。结果表明,该机器人系统满足临床功能性复位标准,保证精确度的同时,提高了人机交互的安全性,在骨折复位手术低辐射、轻量化、高柔顺性的要求下具有潜在优势。

         

        Abstract: To address the technical bottlenecks of minimally invasive closed reduction and intramedullary nailing (IMN), a rigid-flexible hybrid minimally invasive fracture reduction robot is proposed. The system leverages the compliant contact properties and continuous deformation capabilities of soft materials to ensure reduction accuracy while satisfying the compliance and safety requirements of the fracture reduction process. Additionally, based on the anatomical and physiological characteristics of the human lower limbs, a femoral shaft fracture model was developed, accounting for the presence of soft tissues such as muscles around the fracture site. Subsequently, fracture reduction experiments were conducted on the model following clinical surgical reduction protocols. After reduction, the maximum angular error was 0.6°, and the maximum residual translation was 1.0 mm. Results demonstrate that the proposed system meets the clinical functional reduction criteria, ensuring precision while enhancing human-robot interaction safety. It exhibits potential advantages in meeting the demands oflow radiation, lightweight design, and high compliance in fracture reduction surgeries.

         

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