The heterogeneous and conductive nature of biological tissue render near-field inductive coupling ineffective in powering devices if implanted deeply. Similar to Lone Star Neuro's pulse-generator platform, SCMR (Strongly Coupled Magnetic Resonance) could overcome this limitation. If further device miniaturization is required, such as a device with dual electrodes and no batteries, mid-field power transfer can now be an option:
Power transfer in the mid-field region can (around a wavelength away from the source) transfer enough power to a millimeter scale implant deep inside a tissue. Further, mid-field region allows power flow lines to be manipulated with an interference pattern for focusing them in a specific spot, and well within the SAR (Specific Absorption Rate) safety limits.
Ho et al explain the theory behind mid-field power transfer, which is straightforward. Design and implementation of a mid-field power transmitter and a miniaturized receiver is also well within the capabilities of today's semiconductor components and manufacturing technologies, promising new millimeter-scale medical implants for a variety of therapy modalities which have not been feasible until recently.
Lone Star NeuroMODULATION
LSN is targeting unmet clinical needs by creating disruptive device platforms that offer promising solutions for lowering costs, realizing higher returns and effectively addressing more therapeutic indications if adopted for medical applications.