Cleared Traditional

K261856 - Halcyon, Ethos Radiotherapy System (5.0)

K261856 is an FDA 510(k) clearance for Halcyon, manufactured by Varian Medical Systems, Inc.. The device is a Class 2 Radiology device with product code IYE cleared through the Traditional 510(k) pathway after a 60-day FDA review.

K261856 · Varian Medical Systems, Inc. · Radiology device
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Aug 2026
Decision
60d
Days
Class 2
Risk

K261856 is an FDA 510(k) clearance for the Halcyon, Ethos Radiotherapy System (5.0). Classified as Accelerator, Linear, Medical (product code IYE), Class II - Special Controls.

Submitted by Varian Medical Systems, Inc. (Palo Alto, US). The FDA issued a Cleared decision on August 3, 2026 after a review of 60 days - a notably fast clearance cycle.

This device falls under the Radiology FDA review panel, regulated under 21 CFR 892.5050 - the FDA radiology and imaging software oversight framework. The Traditional 510(k) pathway establishes clearance through substantial equivalence to a legally marketed predicate device, without requiring clinical trial data.

Device pattern: Fast-track predicate clearance. Standard predicate reliance. The short review cycle indicates strong predicate alignment - the FDA found sufficient equivalence without extended technical review.

View all Varian Medical Systems, Inc. devices

FDA 510(k) Submission Details - K261856

510(k) Number K261856 FDA.gov
FDA Decision Cleared Substantially Equivalent - Traditional 510(k) (SESE)
Date Received June 04, 2026
Decision Date August 03, 2026
Days to Decision 60 days
Submission Type Traditional
Review Panel Radiology (RA)
Summary Summary PDF
Third-party Review No - reviewed directly by FDA
Combination Product No
PCCP Authorized No
Regulatory Context
Review time vs. panel average
47d faster than avg
Panel avg: 107d · This submission: 60d
Pathway characteristics
Predicate-based equivalence. No clinical trials required.

IYE Device Classification - Class 2, Special Controls

Product Code IYE Accelerator, Linear, Medical
Device Class Class 2 - Special Controls
CFR Regulation 21 CFR 892.5050
What this classification means

Class II devices require demonstration of substantial equivalence to a legally marketed predicate device. This pathway does not require clinical trials - it relies on engineering equivalence and performance data. Most Radiology devices follow this clearance model.

Regulatory Peers - IYE Accelerator, Linear, Medical

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