Smart Capsule

GI-Tract-Location-Specific Payload Release - Magnetic Actuation

Once activated through a magnetic proximity fuse, the capsule opens up and releases its powdered payload in a location specified by an implanted miniature magnetic marker or an externally-worn larger magnet. The capsule (9 mm × 26 mm) comprises of two compartments; one contains a charged capacitor and a reed switch while the second one houses the drug reservoir capped by a taut nylon thread intertwined with a nichrome wire. The nichrome wire is connected to the capacitor through the reed switch. The capacitor is charged to 2.7V before ingestion and once within the proximity of the permanent magnet; the reed switch closes, discharging the capacitor through the nichrome wire, melting the nylon thread, detaching the cap and emptying the drug reservoir.

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