Figure 4.

Axial bending stiffness of various intracortical probe designs calculated with equation (2). The examples shown here are representative of different material and design strategies to reduce the effective device stiffness. Probes with k < 10,000 N m ⁻¹ are considered compliant, while probes with k > 10,000 N m⁻¹ are considered stiff. Images reproduced with permission from: [88], (Copyright Elesevier, 2017) [108], (Copyright Wiley, 2018) [46], (Copyright Wiley, 2015) [51], (Copyright, American Chemical Society, 2015) [89], (Copyright IOP, 2014) [109], (Copyright, Wiley, 2017) [107], (Copyright, American Chemical Society, 2018) [61], (Copyright, Springer, 2012) [98], (Copyright, Springer, 2018) [106], (Copyright, IEEE, 2009).