| 摘要 |
The invention relates to an indentation device for determining elastic or viscoelastic properties of a substrate, in particular of cartilage tissue in vivo, having a measurement probe for indenting the substrate, which measurement probe comprises a tube and an optical fiber fastened within the tube, wherein the tube has an outside diameter of less than 1 millimeter. Furthermore, the indentation device comprises at least one fiber Bragg grating, which is written into the optical fiber and which is provided for detecting a force acting on the tip of the optical fiber, and a piezoelectric control element for positioning the measurement probe, which is mechanically connected to the measurement probe and which is designed to move the measurement probe onto the substrate to be measured and to press the measurement probe into the substrate. The indentation device is designed to sense the advancement of the measurement probe and the force acting on the tip of the optical fiber. |
