Аннотация:The plane-parallel indentation of the tool with projections into the homogeneous and in-homogeneous biological tissue is modelled. The linear elastic and two-layer half-spaces are used for tissue modelling. The time-dependence of a force applied to the instrument and dependence of the force on the indentation depth are obtained. The shape of projections and distance between them affect these dependences. The influence of speed on the load applied to the stamp is studied. It is shown that increasing the speed of penetration leads to increasing the value of the total applied force. The shape of projections affects the nature of this dependence too.