Study on Mechanical Response Model of Soft Tissue in the Clamping Process

In clinical surgery, clamping soft tissue effectively has great significance in reducing operation errors rate. The mechanical response model with time-variation in small strain condition and fitted stress-time curve was introduced utilizing the corresponding displacement principle of viscoelastic and elastic tissue in Laplace image space and linear space based on Maxwell model. The mechanical response curve of the soft tissue clamping process, the curve of the peak stress and the stable stress with the increased clamping feed rate were obtained utilizing the finite element simulation software ABAQUS. Non-invasive clamping experiment was conducted using pork liver as experimental material and mechanical response curve was measured under different clamping feed rate. The experimental result is anastomosed well with the mechanical response model. Mechanical response model proposed in this paper is significant for studying mechanical feedback of soft tissue clamping process and exploiting new type of clamping device.