Expert Needed for Neural Probe Electrical Simulation & Design Optimization

Background We are a medical device company developing a multi-contact neural probe with a coiled-wire construction on a mandrel. The structure consists of: • 4 micro contacts — inner coil layer • Polymer insulating layer • 5 macro contacts — outer coil layer • 9 contacts total The probe operates in a demanding dual-mode environment: • Recording: µV-level neural signals up to ~65 mV peak • Stimulation: currents up to 7 mA with compliance voltages up to ±50 V We will provide full mechanical specifications once the engagement begins, including: • Wire cross-sections and diameters • Coil pitch and thread count • Layer dimensions • Contact geometry • Material specifications • Insulation properties • Full mechanical stackup What We Need We are looking for an experienced engineer to help analyze and optimize the electrical behavior of the probe structure using FEM/parasitic extraction and equivalent circuit modeling. The work includes: • Building an electrical model from geometry and material data (RLCG parasitic extraction using Q3D, COMSOL, ANSYS Maxwell, CST, or equivalent) • Generating a SPICE-equivalent circuit for the full 9-contact structure • Simulating behavior under both recording and stimulation conditions • Providing practical design recommendations to improve recording quality, reduce coupling/artifacts, and optimize overall electrical performance Areas of interest include: • Inter-contact and inter-layer coupling, especially stimulation artifact coupling onto micro recording contacts • Contact impedance behavior across the relevant frequency range (~0.3 Hz to 10 kHz) • Insulator material/thickness effects on capacitance and leakage • Coil geometry optimization (pitch, spacing, wire diameter) • Artifact duration and recovery following stimulation • Saline/tissue electrical behavior where relevant • Noise floor and recording quality optimization • Validation and test methodology • Practical implementation/manufacturing considerations where applicable Deliverables • Recommended simulation methodology • Extracted SPICE netlist for the 9-contact structure • Simulation results including impedance spectra, crosstalk, stimulation artifact, and recovery behavior • Identification of electrical risks and limitations • Written design optimization recommendations explaining what to change, why, and expected improvement • Suggested material and geometry improvements Preferred Background • FEM/electromagnetic simulation using COMSOL, ANSYS Q3D, Maxwell, CST, or similar • SPICE simulation using LTSpice, PSpice, or equivalent • Neural stimulation and recording systems • Biomedical electrode modeling and high-impedance recording • Stimulation artifact analysis and coupling reduction • High-voltage stimulation systems • Saline and tissue electrical modeling • Low-noise analog systems • Familiarity with active implantable device standards (ISO 14708 or similar) is a plus but not required Project Scope Please include in your proposal: • Which simulation tools you use for parasitic extraction from 3D geometry • Relevant projects, publications, or examples of similar work (electrode, coil, cable, or biomedical device simulation) • Your experience with neural or biomedical systems specifically • Your suggested approach for this geometry and operating regime