FELLA Electrode Array Assembly

FELLA Electrode Array — AI CAD Design Prompt Overview Design a paddle-shaped implantable neural electrode array consisting of a flexible backbone substrate embedded with a 5×4 grid of rectangular platinum-iridium contact electrodes, following the "Penta, 3 mm" reference pattern. Electrode Contacts Material: Platinum-Iridium (Pt-Ir) foil Shape: Rectangular pad Dimensions: 1 mm (width) × 4 mm (length) × 0.05 mm (50 µm thickness) Orientation: Long axis (4 mm) runs parallel to the paddle's longitudinal centerline Count: 20 electrodes total Array Layout Configuration: 5 columns × 4 rows, simple rectangular grid (no stagger or offset between columns) Longitudinal spacing (row-to-row): 3 mm edge-to-edge (7 mm center-to-center) Lateral spacing (column-to-column): 1 mm edge-to-edge (2 mm center-to-center) Overall array footprint: 25 mm long × 9 mm wide Array centered on the paddle's longitudinal and lateral centerlines Backbone / Substrate Shape: Paddle-shaped — rectangular body with a rounded (semicircular) distal tip, tapering to a narrower proximal neck where lead wires exit Material: Flexible, biocompatible polymer (e.g., medical-grade silicone) — exact material TBD, use silicone visual/mechanical properties as placeholder Overall length: ~35–40 mm (25 mm active array + margin at tip and proximal neck) — TBD, adjust to confirmed dimension when available Overall width: ~12–14 mm (9 mm array width + ~1.5–2.5 mm margin per side) — TBD, adjust to confirmed dimension when available Thickness: ~1–2 mm, thin and flexible — TBD, placeholder until confirmed Electrodes sit flush with or slightly recessed into the top surface of the backbone, exposed on the anterior (down-facing) side only Lead Wires One insulated conductive lead per electrode (20 total), routed from each electrode pad, through the backbone body, exiting together in a bundle at the proximal (narrow) end of the paddle Leads should be drawn as simple cylindrical wires for now (~0.2–0.3 mm diameter placeholder) exiting the neck as a loose bundle Style / Reference Overall form factor should resemble a commercial paddle-shaped spinal cord stimulation lead: flat, flexible, rounded tip, narrow proximal neck tapering into a wire bundle Electrodes visible as small dark rectangular pads arranged in a clean grid when viewed from the anterior (electrode-facing) side Explicit Assumptions to Flag Backbone length, width, and thickness are estimated placeholders — not yet confirmed by the research team Electrode count (20) resolves a contradiction in the source spec sheet (which separately states "16") Lead wire diameter and material are placeholders, not specified in the source document

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