AD5933生物阻抗实时监测的便携式椎弓根内固定辅助系统

Bioelectrical impedance aided surgery system for transpedicle screws fixation based on AD5933

为降低椎弓根内固定手术过程中的螺钉误置率,基于ADI公司的生物阻抗测量芯片AD5933,设计了一种实时监测生物阻抗的便携式智能椎弓根开路装置——椎弓根开路器。开路器通过实时测量其头部电极处的组织电阻抗变化,对电极处的组织进行分析后,通过声音提示医生操作,引导开通螺钉钉道,并避免刺破神经组织。标定实验和离体猪椎骨实验表明,系统在测量精度上满足实际应用要求,能够有效区分软组织、松质骨和皮质骨,将有望降低手术螺钉误置率。

To decrease the pedicle screw misplaced rate of trans-pedicle internal fixation surgery,this article presented an intelligent and hand-held pedicle drilling tool-pedicle awl,which monitored tissue bioelectrical impedance based on AD5933 of ADI company.It can prompt doctors via voice by analyzing the tissue bioelectrical impedance at the awl’s tip.The voice prompt will help to drill pilot holes more accurately and avoid the risk of pricking nerves.Calibration and pigs’ vertebrae experiments were performed.The results demonstrate that the impedance detection precision meets the practical application requirements,where the system can effectively produce obviously different sounds for soft tissue,spongy and cortical bones.The results indicate that the proposed system would have great potential in reducing the malposition rates in surgeries.