For monitoring of carbon monoxide in adult exhaled breath. They are for use in smoking cessation programs and can be used for the screening of CO poisoning and smoke inhalation. Also can be used for ambient air monitoring. For use by healthcare professionals only in professional healthcare facilities.
Device Story
Handheld, battery-powered carbon monoxide analyzers; utilize electrochemical sensor technology to sample exhaled breath or ambient air. Microprocessor converts sensor output into CO concentration (ppm) or carboxyhaemoglobin percentage (%COHb). Operated by healthcare professionals via two-button keypad; results displayed on LCD with colored lights and buzzer alerts. Breath sampling system includes disposable cardboard mouthpiece and adapter with one-way valve to prevent cross-contamination. Used in professional healthcare facilities for smoking cessation, CO poisoning screening, and smoke inhalation assessment. Provides immediate feedback to clinicians for patient monitoring and clinical decision-making regarding CO exposure.
Clinical Evidence
Bench testing only. No clinical data provided. Performance verified via gas performance testing (linearity/repeatability at 20, 50, 100, 375 ppm), temperature testing, and drop testing for housing robustness. Electrical safety and EMC testing conducted per IEC 60601-1 and IEC 60601-1-2.
Technological Characteristics
Electrochemical fuel cell sensor; ABS plastic enclosure; 9V battery powered; handheld form factor; two-button interface with LCD; non-sterile; disposable cardboard mouthpiece with one-way valve adapter. Tested to IEC 60601-1 (electrical safety) and IEC 60601-1-2 (EMC). Biocompatibility per ISO 10993-1.
Indications for Use
Indicated for monitoring carbon monoxide in adult exhaled breath for smoking cessation programs, screening for CO poisoning, smoke inhalation, and ambient air monitoring. For use by healthcare professionals in professional healthcare facilities.
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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Image /page/0/Picture/0 description: The image contains the logos of the Department of Health & Human Services and the Food and Drug Administration (FDA). The Department of Health & Human Services logo is on the left, and the FDA logo is on the right. The FDA logo includes the words "FDA U.S. FOOD & DRUG ADMINISTRATION" in blue text.
March 2, 2018
MD Diagnostics Limited Glen Hillsley Regulatory Affairs 15 Hollingworth Court, Turkey Mill Maidstone, Kent, ME14 5PP UNITED KINGDOM
Re: K171129
Trade/Device Name: Carbon Monoxide Monitors (CO Check Pro & CO Screen) Regulation Number: 21 CFR 868.1430 Regulation Name: Carbon Monoxide Gas Analyzer Regulatory Class: Class II Product Code: CCJ Dated: January 29, 2018 Received: February 1, 2018
Dear Glen Hillsley:
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 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 of medical device-related adverse events) (21 CFR 803); good manufacturing practice requirements as set forth in the quality systems (QS) regulation (21 CFR Part 820);
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and if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR 1000-1050.
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.
For comprehensive regulatory information about mediation-emitting products, including information about labeling regulations, please see Device Advice (https://www.fda.gov/MedicalDevices/DeviceRegulationandGuidance/) and CDRH Learn (http://www.fda.gov/Training/CDRHLearn). Additionally, you may contact the Division of Industry and Consumer Education (DICE) to ask a question about a specific regulatory topic. See the DICE website (http://www.fda.gov/DICE) for more information or contact DICE by email (DICE@fda.hhs.gov) or phone (1-800-638-2041 or 301-796-7100).
Sincerely,
# Michael J. Ryan -S
for Tina Kiang, Ph.D. Acting 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) K171129
Device Name
Carbon Monoxide monitors (CO Check Pro & CO Screen)
Indications for Use (Describe)
For monitoring of carbon monoxide in adult exhaled breath. They are in smoking cessation programs and can be used for the screening of CO poisoning and smoke inhalation. Also can be used for ambient air monitoring. For use by healthcare professionals only in professional healthcare facilities.
| Type of Use (Select one or both, as applicable) | |
|-------------------------------------------------|-----------------------------------------------|
| ☑ Prescription Use (Part 21 CFR 801 Subpart D) | ☐ Over-The-Counter Use (21 CFR 801 Subpart C) |
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#### 510(k) SUMMARY
#### MD Diagnostics Ltd. - Carbon monoxide monitors
# Submitter's Name. Address. Telephone Number. Contact Person and Date Prepared
MD Diagnostics Ltd. 15 Hollingworth Court, Turkey Mill, Maidstone, Kent. ME14 5PP GB
| Phone: | +44(0) 1622 682686 |
|------------|--------------------|
| Facsimile: | +44(0) 1622 681693 |
- Contact Person: Glen Hillsley Date Prepared: March 1, 2017
#### Candidate Device details
| Proprietary/Trade name: | Carbon monoxide monitors (CO Check Pro & CO Screen) |
|-------------------------|-----------------------------------------------------|
|-------------------------|-----------------------------------------------------|
#### Common or Usual Name: Carbon Monoxide Gas Analyzer.
Classification Name: Carbon Monoxide Gas Analyzer, 21 C.F.R. § 868.1430.
Device classification: Il
Product code: CCJ
Classification Panel: Anesthesiology
#### Predicate Device details
Predicate 1: Device name / 510k: TABATABA CO TESTER (k080278) Manufacturer: FIM Medical, France.
Predicate 2: Device name / 510k: MicroCO meter (k950197)
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#### Manufacturer: Carefusion, USA
Further to a review of the MAUDE database, from 1970 to the present day – There is no record of any product problems or safety issues relating to the use carbon monoxide gas analyzers.
#### Device Description
The Carbon monoxide monitors (CO Check Pro & CO Screen) are hand held, battery powered, carbon monoxide analyzers, used for monitoring the concentration of carbon monoxide in adult exhaled breath, typically for use in smoking cessation programs and for the screening of CO poisoning.
The devices are controlled via a two button kevpad with the measured parameters displayed on a simple LCD with coloured lights and an accompanying buzzer sound in response to the CO level.
Electrochemical sensor technology is utilized to sample the gas and a microprocessor converts the output from the sensor into a meaningful displayed result, either as carbon monoxide in parts per million (CO) or the percentage of carboxyhaemoglobin in the blood (%COHb).
The breath sampling system that attaches directly to the carbon monoxide monitors, comprises of a non-patient contacting mouthpiece adapter incorporating a one way valve to prevent cross contamination and a single use, patient contacting cardboard mouthpiece. The mouthpiece adapter maybe replaced or reused as required.
The Carbon monoxide monitors are supplied non sterile for use by healthcare professionals only and can also be used for ambient air monitoring.
#### Intended Use / Indications for Use
The Carbon monoxide monitors are used to measure the concentration of carbon monoxide in exhaled breath
The devices are indicated for:
For monitoring of carbon monoxide in adult exhaled breath. They are for use in smoking cessation programs and can be used for the screening of CO poisoning and smoke inhalation. Also can be used for ambient air monitoring. For use by healthcare professionals only in professional healthcare facilities.
### Comparison of Technological Characteristics with the Predicate Device Substantial Equivalence Determination
Measurement of carbon monoxide in exhaled breath for use in smoking cessation programs and for screening for CO poisoning is the technological principle for both the candidate and predicate devices.
The MD Diaqnostics Carbon monoxide monitors are substantially equivalent to the predicate devices, in terms of intended use, indications for use, technological characteristics, principle of operation, materials and performance characteristics to the cleared TABATABA CO tester covered
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under k080278 and the MicroCO covered under K950197. Any minor differences in this section do not raise any different questions of safety and effectiveness.
| Item | Candidate device - MD Diagnostics - Carbon monoxide monitors (CO Check Pro & CO Screen) | Predicate device - FIM Medical - TABATABA CO tester | Predicate device – Carefusion – MicroCO meter |
|--------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Intended use | Measurement of Carbon monoxide in parts per million (PPM) and Carboxyhaemoglobin (%COHb) in exhaled breath. | SAME | SAME |
| Indications for Use | For monitoring of carbon monoxide in adult exhaled breath. They are for use in smoking cessation programs and can be used for the screening of CO poisoning and smoke inhalation. Also can be used for ambient air monitoring. For use by healthcare professionals only in professional healthcare facilities | SIMILAR, The CO Screen indications statement is the same as the predicate with the exception of explicitly stating the device is for use in adults and in professional healthcare facilities. These minor additions do not change the intended use compared to the predicate. | The predicate indications are not stated. However, the CO Check Pro has the same intended use as the predicate and similar indications as the predicate TABATABA. |
| Environments used | Professional healthcare facilities | SAME | SAME |
| Sensor | Electrochemical fuel cell | SAME | SAME |
| Human Factor | Hand held, two button operated with screen instructions via LCD. | SAME | Slide switch operation |
| Patient breath sampling system | Disposable Cardboard mouthpiece and plastic mouthpiece adapter | Disposable Plastic mouthpiece | SAME |
| Enclosure material | ABS | SAME | SAME |
| CO measurement range | 0 to 99 ppm (CO Check Pro)<br>0 to 375ppm (CO Screen) | 0 to 500 ppm | 0 to 100ppm |
| Accuracy | +/- 2ppm or 5%, whichever is greater (CO Check Pro)<br>+/- 3% (CO Screen) | +/- 5ppm | +/- 1ppm or 5%, whichever is greater |
| Power source | 1 x Battery 9V, PP3 | 2 x Battery AA | SAME |
# Performance Data
The following performance data was provided in support of the substantial equivalence determination:
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# Biocompatibility Evaluation
The biocompatibility assessment for the Carbon monoxide monitors and its operational accessories was conducted in accordance with International Standard ISO 10993-1 - Biological Evaluation of the Medical Devices. Part 1 – Evaluation and testing in the risk management process as recognized by FDA. The Evaluation criteria considered the Cytotoxicity, Sensitization and Irritation aspects only.
# Electrical Safety and ElectroMagnetic Compatibility Testing
Electrical Safety testing, to establish the basic safety and essential performance of the device and also EMC testing, to establish the emissions and immunity characteristics, was conducted on the CO Check Pro in accordance with IEC60601-1 and IEC60601-1-2 standards respectively.
# Performance testing
Performance testing on the Carbon monoxide monitors was conducted to verify the devices' functionality across their operational ranges. This comprises of:
a) Gas performance testing - using known calibrated gases, to demonstrate the linearity and repeatability of CO ppm readings recorded across the device measurement ranges (20pm, 50pm, 100ppm & 375ppm – CO Screen only), with an acceptance criteria of +/- 2ppm or 5% (CO Check Pro) and +/-3% (CO Screen). The test results obtained were within +/- 2ppm for each measurement point.
b) Temperature testing - to demonstrate that the device operates successfully across the environment operating temperature range for the device. c) Packaging testing - to demonstrate the robustness of the device housing via a series of drop tests and the ability to function as intended thereafter.
# Conclusion
The Carbon monoxide monitors are considered as safe and as effective as the predicate devices and are manufactured to a similar basic specification as the predicate devices. The Performance data demonstrates that the devices are fit for purpose and the results observed were as expected and in accordance with recognized standards.
The Carbon monoxide monitors have the same intended use, indications for use, principles of operation and virtually identical technological characteristics as the predicate devices. Due to the similarities, it's considered that the minor technical differences between the Carbon monoxide monitors and its predicate devices' do not raise any different questions of safety or effectiveness.
Thus, the Carbon monoxide monitors are considered substantially equivalent to the predicate devices.
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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.
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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).
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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.
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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.
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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.
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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.
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A lot of people predicated them for a reason. Clicking a node traces parents and children, and selections from search carry over pre-selected.
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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.