FDA 510(k) · Masimo
K243305: Masimo W1 (Masimo Corporation)
Masimo Corporation received FDA 510(k) K243305 for Masimo W1, with a decision date of Apr 3, 2025 (substantially equivalent).
Prescription or OTC: OTC parsed from FDA documents (summary PDF: indications text (parsed))
FDA facts
| FDA number | K243305 |
|---|---|
| Pathway | 510(k) |
| Applicant | Masimo Corporation |
| Device name | Masimo W1 |
| Product code | DPS: Electrocardiograph |
| Regulation (21 CFR) | 870.2340 |
| Device class | Class 2 |
| Date received | Oct 21, 2024 |
| Decision date | Apr 3, 2025 |
| Decision | Substantially Equivalent (SESE) |
| 510(k) type | Traditional |
Source: openFDA device 510(k) data, data through Oct 26, 2026.
Indications for use parsed from FDA documents
Masimo W1™ and the integrated Masimo W1 Module are intended to record, store and transfer single- channel electrocardiogram (ECG) rhythms. The Masimo W1 also displays ECG rhythms, and the Masimo W1 Module detects the presence of atrial fibrillation. The Masimo W1 and the integrated Masimo W1 Module are intended for use by healthcare professionals, patients with known or suspected heart conditions, and health-conscious individuals. Masimo W1 Module ECG software is an over-the-counter (OTC) software that operates on the Masimo W1 Module that can be used with compatible watches (e.g., Masimo W1). The software is intended to create, record, store, transfer, and display a single channel electrocardiogram (ECG) for informational use only in adults 22 years and older. It supports the classification of either atrial fibrillation (AFib) or sinus rhythm with the intention of aiding heart rhythm identification; it is not intended to replace traditional methods of diagnosis or treatment. The software is not intended for users with other known arrhythmias and users should not interpret or take clinical action based on the device output without consultation of a qualified healthcare professional. The Masimo W1™ and the integrated Masimo W1 Module are also intended for the spot-checking of functional oxygen saturation of arterial hemoglobin (SpO2) and pulse rate (PR). The Masimo W1 and the integrated Masimo W1 Module are indicated for adults in hospitals, clinics, long-term care facilities, and homes. K243305
Extracted automatically from FDA's 510(k) summary. It can contain extraction errors and is not a verified quote. Read the wording in the FDA PDF before relying on it.
Predicates parsed from FDA documents
FDA numbers found next to the word "predicate" in the summary. The list can include reference devices; check the PDF for which device is the primary predicate.
Later records that cite K243305
- K260676 Radius VSM and Accessories (Masimo, Oct 14, 2026, MHX)
ChatPPG interpretation
A 510(k) decision of "substantially equivalent" means FDA found the device as safe and effective as a legally marketed predicate. FDA's word for this is cleared, not approved. The clearance covers the device and indications in this submission; it does not extend to other features or versions of the same product that were not part of it. See FDA cleared vs approved.
Product code DPS is "Electrocardiograph", class 2, 21 CFR 870.2340.
Our labels for filtering: claim ECG, sensor ECG electrodes. These are heuristics, not FDA fields.