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# FDA Clears Varian’s Calypso Anchored Beacon Transponder
- URL: https://www.fdaweb.com/fda-clears-varians-calypso-anchored-beacon-transponder/
- Published: 2018-04-20T12:00:00.000Z
- Updated: 2026-09-15T00:00:10.000Z
- Author: David McFarland
- Tags: Devices, #legacy-id-D5141269

FDA has cleared a Varian 510(k) for its Calypso Anchored Beacon transponder. Used with Varian’s TrueBeam, Edge and Clinac C-series medical linear accelerators, the transponder detects slight movements of a tumor and helps clinicians deliver lung stereotactic body radiotherapy. The device is implanted in small airways within or near a tumor target so that the transponder can emit non-ionizing electromagnetic signals that are tracked in real-time and used to keep a treatment beam on target, according to the company.