The CoSense ETCO Monitor is indicated for the monitoring of carbon monoxide from endogenous sources (including hemolysis) and exogenous sources (including CO poisoning and smoke inhalation) in exhaled breath. The end tidal carbon monoxide level can be used for the monitoring of carbon monoxide in medical conditions in which the rate of hemolysis may be relevant. It is also for use in smoking cessation programs and can be used for the screening of CO poisoning and smoke inhalation.
Device Story
Battery-operated monitor; uses infrared capnometer to detect end-tidal breath portion; electrochemical sensor measures CO concentration. Input: exhaled breath via single-use nasal cannula. Output: CO concentration levels displayed on LCD. Used in clinical settings; operated by healthcare professionals. Provides quantitative CO data to assist in monitoring hemolysis rates, smoking cessation progress, and screening for CO poisoning/smoke inhalation. Benefits include rapid, non-invasive assessment of CO levels.
Clinical Evidence
Bench testing only. No clinical data presented. Performance verified through biocompatibility (ISO 10993-1, -5, -10), electrical safety/EMC (IEC 60601-1-2), and mechanical shipping testing (ASTM D4169-09). CO measurement accuracy verified against performance specifications.
Technological Characteristics
Portable battery-operated device; infrared capnometer; electrochemical CO sensor with heating element. Non-DEHP PVC nasal cannula. LCD display. Microprocessor-based control. Biocompatibility per ISO 10993. Electrical safety per IEC 60601-1-2. Shipping tested per ASTM D4169.
Indications for Use
Indicated for monitoring exhaled carbon monoxide (CO) in patients to assess endogenous sources (hemolysis) and exogenous sources (CO poisoning, smoke inhalation). Also indicated for smoking cessation programs and screening for CO poisoning/smoke inhalation.
Regulatory Classification
Identification
A carbon monoxide gas analyzer is a device intended to measure the concentration of carbon monoxide in a gas mixture to aid in determining the patient's ventilatory status. The device may use techniques such as infrared absorption or gas chromatography.
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Food and Drug Administration 10903 New Hampshire Avenue Document Control Center - WO66-G609 Silver Spring, MD 20993-0002
July 22, 2015
Capnia, Inc. Kristen Yen Vice President. Clinical and Regulatory Affairs 3 Twin Dolphin Drive, Suite 160 Redwood City, CA 04065
Re: K151107
Trade/Device Name: CoSense ETCO Monitor Regulation Number: 21 CFR 868.1430 Regulation Name: Carbon Monoxide Gas Analyzer Regulatory Class: Class II Product Code: CCJ Dated: June 19, 2015 Received: June 22, 2015
Dear Ms. Kristen Yen:
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 yours,
**Tejashri Purohit-Sheth, M.D.**
Tejashri Purohit-Sheth, M.D. Clinical Deputy Director DAGRID/ODE/CDRH FOR
Erin I. Keith, M.S. Director Division of Anesthesiology, General Hospital, Respiratory, Infection Control, and Dental Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
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## Indications for Use
510(k) Number (if known)
K151107
Device Name CoSense ETCO Monitor
#### Indications for Use (Describe)
The CoSense ETCO Monitor is indicated for the monitoring of carbon monoxide from endogenous sources (including hemolysis) and exogenous sources (including CO poisoning and smoke inhalation) in exhaled breath. The end tidal carbon monoxide level can be used for the monitoring of carbon monoxide in medical conditions in which the rate of hemolysis may be relevant. It is also for use in smoking cessation programs and can be used for the screening of CO poisoning and smoke inhalation.
Type of Use (Select one or both, as applicable)
| <input checked="true" type="checkbox"/> Prescription Use (Part 21 CFR 801 Subpart D) |
|--------------------------------------------------------------------------------------|
| <input type="checkbox"/> Over-The-Counter Use (21 CFR 801 Subpart C) |
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### 510(k) Summary
| Submitter: | Capnia, Inc.<br>3 Twin Dolphin Drive, Ste 160<br>Redwood City, CA 94065 |
|-----------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Contact Person: | Kristen Yen<br>Vice President, Clinical and Regulatory Affairs<br>Tel: (650) 353-2051<br>Fax: (650) 213-8383<br>Email: kristen@capnia.com |
| Date Prepared: | 7/21/2015 |
| Trade Name: | CoSense® ETCO Monitor |
| Common Name: | Carbon Monoxide Monitor |
| Classification Name: | Carbon Monoxide Gas Analyzer<br>(21 CFR 868.1430, Product Code CCJ) |
| Predicate Device: | CoSense® ETCO Monitor (K130036) |
| Device Description: | The CoSense ETCO Monitor is a battery-operated carbon<br>monoxide (CO) monitor. It uses an infrared capnometer to detect<br>the end-tidal portion of the breath and an electrochemical carbon<br>monoxide sensor to measure the end-tidal breath CO concentration.<br>The device consists of a portable unit with software controlled<br>menu (date, time, patient identification, measurement time of<br>monitoring), single-use nasal cannula, replaceable CO Sensor, and<br>a battery charger / power supply. |
| Indication for Use: | The CoSense ETCO Monitor is indicated for the monitoring of<br>carbon monoxide from endogenous sources (including hemolysis)<br>and exogenous sources (including CO poisoning and smoke<br>inhalation) in exhaled breath. The end tidal carbon monoxide level<br>can be used for the monitoring of carbon monoxide in medical<br>conditions in which the rate of hemolysis may be relevant. It is also<br>for use in smoking cessation programs and can be used for the<br>screening of CO poisoning and smoke inhalation. |
| Technological<br>Characteristics: | The CoSense ETCO Monitor uses the identical performance<br>specifications (accuracy, range, and resolution), related software<br>algorithms, sensors, and accessories as our predicate device, the<br>CoSense ETCO Monitor. |
# Comparison to Predicate Device (K130036)
| | Capnia CoSense ETCO Monitor<br>(Subject Device) | Capnia CoSense ETCO Monitor<br>(Predicate Device) |
|----------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 510(k) Number | | K130036 |
| Manufacturer | Capnia, Inc. | Capnia, Inc. |
| | Capnia CoSense ETCO Monitor<br>(Subject Device) | Capnia CoSense ETCO Monitor<br>(Predicate Device) |
| Classification | Class II | Class II |
| Product Code | CCJ | CCJ |
| Regulation | 21 CFR 868.1430 | 21 CFR 868.1430 |
| Indications for<br>Use | The CoSense ETCO Monitor is<br>indicated for the monitoring of carbon<br>monoxide from endogenous sources<br>(including hemolysis) and exogenous<br>sources (including CO poisoning and<br>smoke inhalation) in exhaled breath.<br>The end tidal carbon monoxide level<br>can be used for the monitoring of<br>carbon monoxide in medical<br>conditions in which the rate of<br>hemolysis may be relevant. It is also<br>for use in smoking cessation<br>programs and can be used for the<br>screening of CO poisoning and smoke<br>inhalation. | The CoSense ETCO Monitor is<br>indicated for the monitoring of carbon<br>monoxide from endogenous sources<br>(including hemolysis) and exogenous<br>sources (including CO poisoning and<br>smoke inhalation) in exhaled breath.<br>The end tidal carbon monoxide level<br>can be used for the monitoring of<br>carbon monoxide in medical<br>conditions in which the rate of<br>hemolysis may be relevant. It is also<br>for use in smoking cessation programs<br>and can be used for the screening of<br>CO poisoning and smoke inhalation. |
| Patient Interface | Nasal cannula | Nasal cannula |
| Dimensions<br>(LxWxH) | 246mm x 197mm x 68mm | 246mm x 197mm x 68mm |
| Weight | 3.3lbs | 3.3lbs |
| Materials | | |
| CO Sensor Cell<br>Type | Electrochemical<br>(heating element in sensor housing) | Electrochemical |
| Cannula | Non-DEHP PVC | Non-DEHP PVC |
| Battery | Li-Ion | Li-Ion |
| Performance<br>Specifications | | |
| Accuracy | +/- 10% or +/-0.5ppm<br>whichever is greater | +/- 10% or +/-0.5ppm<br>whichever is greater |
| CO<br>Measurement<br>Range | 1.0 – 25.0ppm | 1.0 – 25.0ppm |
| Resolution | 0.1 ppm | 0.1 ppm |
| Breaths per<br>Minute | 10 – 50 bpm | 10 - 50 bpm |
| Sample<br>Collection Rate | 48 mL/min + 2.0 mL/min | 48 mL/min + 2.0 mL/min |
| | Capnia CoSense ETCO Monitor<br>(Subject Device) | Capnia CoSense ETCO Monitor<br>(Predicate Device) |
| Measurement<br>Time | Less than 5 minutes | Less than 5 minutes |
| Sample<br>collection | Collection of a normal breath using a<br>disposable nasal cannula | Collection of a normal breath using a<br>disposable nasal cannula |
| Modes | Expired | Expired |
| Device shelf life | 1 year before servicing | 1 year before servicing |
| CO Sensor shelf<br>life | 6 months | 6 months |
| Cannula shelf<br>life | 13 months | 8 months |
| Screen | LCD | LCD |
| Software/<br>Hardware | Analog and digital electronics with<br>microprocessor | Analog and digital electronics with<br>microprocessor |
| Rechargeable<br>Battery | Yes | Yes |
| Power Source | Rechargeable Battery | Rechargeable Battery |
| Functional and<br>Safety Testing: | The design and performance specifications are identical and<br>unchanged from our predicate device. To verify that the device<br>design met its functional and performance requirements,<br>representative samples of the device underwent biocompatibility<br>(Cytotoxicity, Sensitization, and Irritation), software, electrical, and<br>mechanical testing, specifically CO Measurement accuracy. The<br>following industry standards were used in applicable tests:<br>• AAMI / ANSI / ISO 10993-1 2009/(R) 2013 Biological<br>evaluation of medical devices -- Part 1: Evaluation and<br>testing within a risk management process<br>• AAMI / ANSI / ISO 10993-5 2009/(R) 2014 Biological<br>evaluation of medical devices -- Part 5: Tests for in vitro<br>cytotoxicity<br>• AAMI / ANSI / ISO 10993-10 2010 Biological evaluation of<br>medical devices -- Part 10: Tests for irritation and skin<br>sensitization<br>• General Principles of Software Validation; Final Guidance<br>for Industry and FDA Staff<br>• AAMI / ANSI / IEC 60601-1-2:2007 (R) 2012 Medical<br>Electrical Equipment – Part 1-2: General Requirements for<br>Safety-Collateral Standard: Electromagnetic Compatibility<br>• ASTM D4169-09 Standard Practice for Performance Testing<br>of Shipping Containers and Systems | |
| | Capnia CoSense ETCO Monitor<br>(Subject Device) | Capnia CoSense ETCO Monitor<br>(Predicate Device) |
| Technical<br>Comparison of<br>Changes: | The modified CoSense ETCO Monitor is substantially<br>equivalent to the predicate device. In accordance with the FDA<br>Guidance document "Deciding When to Submit a 510(k) for a<br>Change to an Existing Device", the modifications were<br>thoroughly reviewed for introduction of new risks. The<br>differences between the subject device and predicate device<br>(heating element, cannula configuration, flow rate sensor, and<br>software updates) do not result in a change to performance<br>specifications or intended use of the device. | |
| Conclusion: | Capnia considers the CoSense ETCO Monitor device to be<br>substantially equivalent to our predicate device listed above.<br>This conclusion is based upon the devices' similarities in<br>principles of operation, performance requirements, functional<br>and safety testing as well as indications for use. |…
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.