The Stealth™ Monitor is a prescription only single use, continuous recording ECG monitor that can be worn up to 168 hours (7 days) during activities of daily living. It is indicated for use on adult patients who may be asymptomatic or who may suffer from transient symptoms such as palpitations, dizziness, anxiety, fatigue, syncope, presyncope, light-headedness, shortness of breath and where a software-assisted analysis of the potential causes of these symptoms is desirable.
Device Story
Stealth™ Monitor is a lightweight, patch-style, single-use cardiac monitor; worn on patient's chest like adhesive bandage; collects continuous ECG data for up to 168 hours. Device uses integrated electrodes to record ECG signals; data retrieved via direct connection to software application installed at physician's office. Software generates reports and saves full disclosure ECG files for physician review. Physician uses output to characterize ECG signals and identify potential causes of cardiac symptoms. Benefits include ambulatory monitoring during activities of daily living, facilitating diagnosis of transient cardiac events.
Clinical Evidence
Bench testing only. Device performance evaluated against accepted standards in a laboratory environment. Documentation provided includes risk management, hazard analysis, and verification/validation protocols/reports for software and hardware.
Technological Characteristics
Patch-style, single-use ECG monitor; foam housing; <9g weight. Integrated electrodes with hydrogel. Continuous recording up to 168 hours. USB 2.0 data transfer. Battery-powered. Software-assisted analysis of ECG data. No sterilization.
Indications for Use
Indicated for adult patients, asymptomatic or experiencing transient symptoms (palpitations, dizziness, anxiety, fatigue, syncope, presyncope, light-headedness, shortness of breath), requiring continuous ECG monitoring for up to 168 hours.
Regulatory Classification
Identification
A medical magnetic tape recorder is a device used to record and play back signals from, for example, physiological amplifiers, signal conditioners, or computers.
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Image /page/0/Picture/1 description: The image shows the logo for the U.S. Department of Health & Human Services. The logo consists of a stylized human figure with three faces in profile, one behind the other. The figure is positioned to the right of the text "DEPARTMENT OF HEALTH & HUMAN SERVICES - USA", which is arranged in a circular pattern around the figure.
Public Health Service
Food and Drug Administration 10903 New Hampshire Avenue Document Control Center - WO66-G609 Silver Spring, MD 20993-0002
July 11, 2015
Cardiac Insight, Inc. % Deborah Sheffield Regulatory Consultant Deborah L. Sheffield Consulting 5672 Flagler Road Norland, Washington 98358
Re: K142468
Trade/Device Name: StealthTM Monitor Regulation Number: 21 CFR 870.2800 Regulation Name: Medical Magnetic Tape Recorder Regulatory Class: Class II Product Code: MLO, DXH, DPS, DSH Dated: August 31, 2014 Received: September 3, 2014
Dear Deborah Sheffield,
We have reviewed your Section 510(k) premarket notification of intent to market the device referenced above and have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to legally marketed predicate devices marketed in interstate commerce prior to May 28, 1976, the enactment date of the Medical Device Amendments, or to devices that have been reclassified in accordance with the provisions of the Federal Food, Drug, and Cosmetic Act (Act) that do not require approval of a premarket approval application (PMA). You may, therefore, market the device, subject to the general controls provisions of the Act. The general controls provisions of the Act include requirements for annual registration, listing of devices, good manufacturing practice, labeling, and prohibitions against misbranding and adulteration. Please note: CDRH does not evaluate information related to contract liability warranties. We remind you, however, that device labeling must be truthful and not misleading.
If your device is classified (see above) into either class II (Special Controls) or class III (PMA), it may be subject to additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 898. In addition, FDA may publish further announcements concerning your device in the Federal Register.
Please be advised that FDA's issuance of a substantial equivalence determination does not mean that FDA has made a determination that your device complies with other requirements of the Act or any Federal statutes and regulations administered by other Federal agencies. You must comply
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with all the Act's requirements, including, but not limited to: registration and listing (21 CFR Part 807); labeling (21 CFR Part 801); medical device reporting (reporting of medical devicerelated adverse events) (21 CFR 803); good manufacturing practice requirements as set forth in the quality systems (QS) regulation (21 CFR Part 820); and if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR 1000-1050.
If you desire specific advice for your device on our labeling regulation (21 CFR Part 801), please contact the Division of Industry and Consumer Education at its toll-free number (800) 638-2041 or (301) 796-7100 or at its Internet address
http://www.fda.gov/MedicalDevices/ResourcesforYou/Industry/default.htm. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR Part 807.97). For questions regarding the reporting of adverse events under the MDR regulation (21 CFR Part 803), please go to
http://www.fda.gov/MedicalDevices/Safety/ReportaProblem/default.htm for the CDRH's Office of Surveillance and Biometrics/Division of Postmarket Surveillance.
You may obtain other general information on your responsibilities under the Act from the Division of Industry and Consumer Education at its toll-free number (800) 638-2041 or (301) 796-7100 or at its Internet address
http://www.fda.gov/MedicalDevices/ResourcesforYou/Industry/default.htm.
Sincerely vours.
A. Mitchell Stein
for Bram D. Zuckerman, M.D. Director Division of Cardiovascular Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
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## 510(k) PREMARKET NOTIFICATION INDICATION FOR USE
510(k) Number: _ k142468 ________
#### Device Name: Stealth™ Monitor
#### Indications For Use:
The Stealth™ Monitor is a prescription only single use, continuous recording ECG monitor that can be worn up to 168 hours (7 days) during activities of daily living. It is indicated for use on adult patients who may be asymptomatic or who may suffer from transient symptoms such as palpitations, dizziness, anxiety, fatigue, syncope, presyncope, light-headedness, shortness of breath and where a software-assisted analysis of the potential causes of these symptoms is desirable.
| Prescription Use | X |
|-----------------------------|--------|
| (Part 21 CFR 801 Subpart D) | |
| | AND/OR |
| Over-The-Counter Use | |
| (21CFR 801 Subpart C) | |
#### (PLEASE DO NOT WRITE BELOW THIS LINE-CONTINUE ON ANOTHER PAGE IF NEEDED)
Concurrence of CDRH, Office of Device Evaluation (ODE)
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## 510(k) Premarket Notification Summary
### 1. Submitter's Information
| Company Name: | Cardiac Insight, Inc. |
|----------------------|----------------------------------------------------------------------------|
| Company Address: | 2815 Eastlake Avenue, Suite 300<br>Seattle, WA 98102 |
| Company Phone: | 206-596-2060 |
| Contact: | Brad Harlow / bharlow@cardiacinsightinc.com |
| Trade Name: | Stealth System |
| Common Name: | ECG Recorder |
| Classification Name: | Electrocardiograph, Ambulatory, With Analysis Algorithm<br>21 CFR 870.2800 |
## 2. Predicate Device Identification
| Device Name | Clearance Number | Product Code |
|------------------------|------------------|--------------|
| SEER MC | K042782 | MLO |
| AliveCor Heart Monitor | K142743 | DXH, DPS |
| Stealth™ System (M100) | K130288 | DSH |
All predicates are Class II devices.
## 3. Indications for Use and Device Description
#### Indications for Use
The Stealth™ Monitor is a prescription only single use, continuous recording ECG monitor that can be worn up to 168 hours (7 days) during activities of daily living. It is indicated for use on adult patients who may be asymptomatic or who may suffer from transient symptoms such as palpitations, dizziness, anxiety, fatigue, syncope, presyncope, light-headedness, shortness of breath and where a software-assisted analysis of the potential causes of these symptoms is desirable.
The Indications for Use are consistent with those of the predicate devices.
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#### Device Description
The Stealth™ Monitor is a small, lightweight, patch-style, single-use cardiac monitor designed for ambulatory collection of electrocardiographic (ECG) data continuously for up to 168 hours (7 days) and ECG signal characterization. It is worn on the patient's chest similar to an adhesive bandage. The housing is constructed of a foam material making the device very lightweight (less than 9 grams).
Image /page/4/Picture/4 description: The image shows a white, three-compartment tray against a dark background. Each compartment is square-shaped with rounded corners and slightly raised edges. The compartments are connected to each other, forming a single unit. The tray appears to be made of a molded material, possibly plastic or foam.
A software application is installed at a physician's office to receive the data from the monitor using a direct connection. Data retrieved from the monitor may be printed or saved and stored for later viewing. The DSD software has the ability to generate reports as well as the ability to save a full disclosure ECG file for viewing.
## 4. Technological Characteristics of the Device as Compared to Predicate Devices
| Device<br>Characteristics | Stealth™ System S200<br>(K142468) | SEER MC (K042782) | AliveCor Heart Monitor<br>(K142743) | Stealth™ System S100<br>(K130288) |
|---------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Indications for Use | The Stealth™ Monitor is a<br>prescription only single<br>use, continuous recording<br>ECG monitor<br>that can be worn up to<br>168 hours<br>(7 days) during activities<br>of daily living.<br>It is indicated for use on<br>adult patients who may be<br>asymptomatic or<br>who may suffer from<br>transient symptoms such<br>as palpitations, dizziness,<br>anxiety, fatigue, syncope,<br>pre-syncope, light-<br>headedness, shortness of<br>breath and where a<br>software-assisted analysis<br>of the potential causes of<br>these symptoms<br>is desirable. | The SEER MC Ambulatory<br>Digital Analysis Recorder<br>is intended to provide<br>ambulatory ECG signal<br>and automated analysis of<br>the recorded ECG data.<br>Results of the automated<br>analysis, when used in<br>conjunction with an<br>ECG review system, are<br>intended to assist the<br>physician in the<br>interpretation of the<br>recorded data. | The AliveCor Heart<br>Monitor is intended to<br>record, store and transfer<br>single-channel<br>electrocardiogram<br>(ECG) rhythms. The<br>AliveCor Heart Monitor<br>also displays ECG rhythms<br>and detects the presence of<br>atrial fibrillation and<br>normal sinus rhythm<br>(when prescribed or used<br>under the care of a<br>physician). The AliveCor<br>Heart Monitor is intended<br>for use by healthcare<br>professionals, patients<br>with known or suspected<br>heart conditions and<br>health conscious<br>individuals. | The Stealth™ Monitor is a<br>prescription only<br>single use, continuous<br>recording ECG monitor<br>that can be worn up to<br>24 hours. It is indicated<br>for use with patients<br>where it would be<br>desirable to record<br>ECG signals for this period<br>of time. |
| Product Code | MLO | MLO | DXH, DPS | DSH |
| Device<br>Classification | II / 870.2800 | II / 870.2800 | II / 870.2920 | II / 870.2800 |
| Where used | Ambulatory outpatient<br>use | Ambulatory outpatient<br>use | Ambulatory outpatient use | Ambulatory outpatient use |
| Prescription Req'd | Prescription only | Prescription only | Prescription only | Prescription only |
| Adult/Pediatric | Adult | Both | Adult | Adult |
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| Single Use/<br>Reusable | Single use | Reusable, single-use<br>electrodes | Reusable | Single use |
|----------------------------------|------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------|---------------------------------------|
| ECG Storage | At least 168 hours | 48 hours | "Practically unlimited" | At least 24 hours |
| Recording Type | Continuous | Continuous | Continuous | Continuous |
| Application/Wear | Adhesive, body worn | Holster for device,<br>adhesive electrodes | Patient applied, held in<br>place for duration of<br>recording | Adhesive, body worn |
| User Interface | On/Off, Event button | On/Off, Event Button | Smartphone app | On, Event Button |
| Data Transfer | USB 2.0 | Serial | Telephonic/Network | RS-232 to USB 2.0 |
| Arrhythmias<br>and/or statistics | Normal, fastest heart<br>rate, slowest heart rate,<br>average heart rate,<br>pauses, bradycardia<br>(run), tachycardia (run) | Normal, fastest heart rate,<br>slowest heart rate,<br>ventricular beats,<br>supraventricular beats,<br>pauses, ST segment<br>changes, prolonged QT,<br>T-wave alternans, Heart<br>rate turbulence, Heart Rate<br>Variability | Normal Rhythm, Atrial<br>fibrillation | None |
| Software Used | Yes | Yes | Yes | Yes |
| Full Disclosure | | | | |
| Power Supply | Battery | Battery | Battery | Battery |
| Electrodes | 3 integrated electrodes | 3 individual electrodes | 2 integrated electrodes | 3 integrated electrodes |
| Lead Wires | Integrated into device | External | Integrated into device. | Integrated into device |
| Lead Vector | Lead I | Multiple | Lead I | Lead I |
| Sterile | No | No | No | No |
| Patient Contact<br>Materials | Conventional electrodes<br>/ hydrogel | Conventional electrodes<br>/ hydrogel | Hard electrodes<br>(metallic) | Conventional electrodes<br>/ hydrogel |
None of the differences outlined in this table raise new issues of safety or effectiveness. The Indications for Use and technological characteristics of the device and its predicates are consistent with one another. Therefore, we believe the device to be Substantially Equivalent to the predicate devices.
Note: Response-Part 5 (Substantial Equivalence Discussion) contains a detailed analysis of this table.
#### 5. Biocompatibility
No new issues of biocompatibility are raised with this device. All materials contained in the device are commonly employed in medical devices in the United States.
# 6. Summary of Performance Testing
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The device was evaluated for safety and performance to accepted standards in a laboratory environment and detailed documentation has been provided.
| Performance Documentation | Status |
|---------------------------------------------------|----------|
| Level of Concern Determination (Moderate) | Provided |
| Development Plans | Provided |
| Device Description | Provided |
| System Requirement Specifications | Provided |
| Risk Management / Safety | Provided |
| Hazard Analysis Report | Provided |
| Component Requirement Specifications | Provided |
| Software/Hardware Design Descriptions | Provided |
| Traceability Matrix | Provided |
| Verification and Validation Protocols and Reports | Provided |
| Unresolved Anomalies (Bugs or Defects) | Provided |
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Two short videos show you everything — or skip straight to the written tutorial if you'd rather read. You can reopen this any time from the Tutorial button in the top bar.
Part 1 — Search, results, and everyday workflows 16 min
Part 2 — Embeddings: the galaxy map 3 min
1. Search: exact and fuzzy
Type a phrase like "coronary artery calcification" into the search box. You get two kinds of results. Exact results match the literal phrase — prefix searches work ("coronary artery calcificati") but suffix searches do not. Fuzzy results match on the meaning and intent of your phrase rather than the exact words, and are sorted by relevance score. Hover over the Exact or Fuzzy badge on any row to see exactly why it matched.
Use the checkboxes above the results to narrow: SaMD keeps only software-only devices, AI / ML keeps only devices with AI.
Exact vs. fuzzy search: what's the difference?
Exact matches on the literal phrase (prefix search works, suffix does not). Fuzzy matches on the meaning and intent of the phrase rather than the exact words. Hover over the badge on any row to see why it matched.
You search "coronary artery calcification" and want only software devices with AI. What two filters do you apply?
Narrow by SaMD (software-only devices), then narrow by AI/ML (devices with AI).
2. The results table
Scroll right in the results table. The intended use is extracted for you — no need to open the PDF. The device story gives a high-level snapshot of what the device does and how it's used. The AI Performance sub-table shows each output name, acceptance criteria, observed values, and development/test dataset descriptions — the same format Innolitics uses for regulatory strategy outputs, and the fastest high-level fingerprint of an AI device. It is AI-generated but has been very reliable in practice.
Where do you find a device's intended use without opening the PDF?
Scroll right in the search results table. The intended use column is extracted for you; no need to dig into the 510(k) summary PDF.
What does the AI Performance sub-table show, and why is it useful?
Output name, acceptance criteria, observed values, development dataset description, and test dataset description. It's the same format we use for regulatory strategy output and Fast 510(k) input, and the fastest high-level fingerprint of an AI device. AI-generated but reliable in practice.
3. Judging fuzzy relevance
Fuzzy results trail off in relevance as you scroll. Use three signals to decide how far down to go: the fuzzy badge explanations, the intended use column, and whether your target output (e.g., Cobb angle) still appears in the AI Performance sub-table. Once it stops appearing, you're past the relevant zone. A top hit with a low score (~0.4) and a stretched explanation is a hint the closest predicates are far away — the project may be headed for De Novo. Note the fuzzy search is a pattern match: it doesn't handle negation ("not") well, and hardware devices can appear — filter by SaMD/AI ML to cut them.
How do you judge how far down fuzzy search results to go?
Use the relevancy signals: the fuzzy badge explanations, the intended use column, and whether the target output (e.g., Cobb angle) still appears in the AI Performance sub-table. Once it stops appearing, results are trailing off in relevancy.
4. Device detail page: chat and citations
Click a device name to open its detail page: device facts on the left, a chat window on the right. Ask something like "Describe the training data". The answer carries little citation bubbles — click one to jump to the highlighted passage in the source PDF, so you can verify every AI answer against the document. There's also a Download PDF button for sharing.
How do you verify an AI chat answer on the device detail page?
Click the citation bubbles to jump to the relevant highlight in the source document.
Reading rule for every project: how many summaries do you read in full?
At least the three most relevant 510(k) or De Novo summaries, in full. After that, use targeted chat questions to confirm your memory quickly. The tool supports this professional habit — it doesn't replace it.
5. Side-by-side comparison
Select multiple rows in the results table (aim for under ~10), then open the PDF Viewer tab. Ask one question — it goes to all selected devices in parallel, each with citations. This is the fastest way to compare and contrast devices: training data, PCCP scope, how they handled adding new scanners, and so on.
What does the side-by-side PDF viewer mode do?
Select multiple devices, open the PDF viewer tab, and ask one question (e.g., "Describe the training data"). It queries all selected devices simultaneously with citations, so you can compare and contrast quickly.
6. Collections
With rows selected, go to the Collections tab and create a labeled collection (e.g., "Cobb Angle Project"). Reload that selection any time — before a client call, pull up the collection and ask questions across all of its devices at once.
How do you save a set of selected devices for later use?
Select the rows, go to the Collections tab, and create a labeled collection (e.g., "Cobb Angle Project"). You can reload the selection anytime and carry it into the PDF viewer and other tabs that support selections.
7. Product codes and the regulations tree
Click a product code in the results to jump to it in the regulations tree — identification text, sibling product codes, and devices you can open in a PDF viewer on the right. Click a regulation number to see its identification, special controls, and related product codes. You can also search by product code or regulation number at the top of the tree. Always read the special controls if any exist for your device — it broadens your search and sharpens pre-kickoff research.
What can you do from the regulations tree view?
Browse product codes and regulation numbers, read the identification text and special controls, browse sibling product codes, open device PDFs on the right, and search by product code or regulation number at the top of the tree.
8. Chart view
Click Show Chart and segment by regulation number (or product code) to see which regulations dominate your result set. Clicking a regulation takes you into the regulations tree. Great for spotting that most matches are, say, hardware laparoscopic devices — a cue to go back and filter.
How do you see which regulations dominate a search result set?
Click "Show Chart" and segment by Regulation Number. Clicking a regulation takes you to the regulations tree.
9. The predicate graph
Open the Predicates tab for a family-tree view of predicate relationships. Click a node to trace its parents and children; selections from search carry over pre-selected. Commonly predicated devices are worth reading — a lot of people predicated them for a reason. The visual lineage is also handy on client calls, e.g. to show how a predicate family evolved and justify why your predicate still holds.
In the predicate graph, why are commonly predicated devices worth reading?
A lot of people predicated them for a reason. Clicking a node traces parents and children, and selections from search carry over pre-selected.
10. Embeddings: the galaxy map
The Embeddings tab plots every matching document in a 2-D "galaxy map" where semantically similar devices cluster together. Hover or click clusters to explore, and let AI label the clusters for you. Embeddings beat product codes for grouping: two devices can carry different product codes (LLZ vs. QIH) yet do the same thing — the embedding captures the meaning of the intended use and device story. This is also exactly how retrieval-augmented generation (RAG) works under the hood, and it makes a great visual on client calls.
Try it yourself
Head to the search page and work through a few of these AI/ML fuzzy searches to build intuition: perivascular fat on CT · aortic valve calcification opportunistic screening on noncontrast CT · breast cancer prediction on digital pathology slides · autism detection · gestational age prediction · a hearing aid that can also detect a pulse · foundation model based analysis of ECG · large language models · penetration test. Watch how the relevance scores, intended use, and AI Performance tables tell you when results stop being meaningful.