K242424 · Cadwell Industries, Inc. · MNR · Dec 18, 2024 · Anesthesiology
Device Facts
Record ID
K242424
Device Name
Bluebird Single-Use Respiratory Effort Belt
Applicant
Cadwell Industries, Inc.
Product Code
MNR · Anesthesiology
Decision Date
Dec 18, 2024
Decision
SESE
Submission Type
Traditional
Regulation
21 CFR 868.2375
Device Class
Class 2
Attributes
Pediatric
Indications for Use
The Bluebird Single-Use Respiratory Effort Belt is intended to measure respiratory effort to assist in the diagnosis of sleep disorders or sleep related respiratory disorders. The respiratory effort belt signals are suitable for connection to sleep/polysomnography (PSG) systems. The intended environments are hospitals, institutions, sleep clinics, or other test environments, including the patient's home. The Bluebird Single-Use Respiratory Effort Belt is intended for diagnostic purposes only on patients greater than 2 years of age and is not intended to be used as an apnea monitor.
Device Story
Bluebird Single-Use Respiratory Effort Belt measures chest/abdomen expansion/contraction during respiration; utilizes Respiratory Inductive Plethysmography (RIP) technology. Device consists of elastic belt with embedded sinusoidal copper wire coil; inductance changes as belt stretches. Connects to physiological recording equipment (PSG systems) via 1.5mm female touch-proof jacks. Used in hospitals, clinics, or home settings; operated by clinicians or technicians. Provides output signal proportional to stretch; assists clinicians in diagnosing sleep disorders. Passive device; no internal power source; signal processing performed by connected PSG recorder.
Clinical Evidence
Bench testing only. Comparative performance testing demonstrated equivalent respiratory effort signal output between the subject device and the predicate when connected to the same PSG recorder. Testing verified dimensional requirements, buckle functionality, and compatibility with standard PSG recording equipment.
Technological Characteristics
Respiratory Inductive Plethysmography (RIP) sensor. Materials: elastic fabric, plastic (polypropylene buckle), copper wire. Form factor: pre-sized elastic belt (various sizes). Connectivity: 1.5mm female touch-proof jacks (DIN 42 802 compliant). Passive device; no energy source. Single-use.
Indications for Use
Indicated for patients > 2 years of age to measure respiratory effort for diagnosis of sleep disorders or sleep-related respiratory disorders. Not for use as an apnea monitor.
Regulatory Classification
Identification
A breathing (ventilatory) frequency monitor is a device intended to measure or monitor a patient's respiratory rate. The device may provide an audible or visible alarm when the respiratory rate, averaged over time, is outside operator settable alarm limits. This device does not include the apnea monitor classified in § 868.2377.
Predicate Devices
XactTrace® Single Use Respiratory Effort Belt System (K173793)
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December 18, 2024
Cadwell Industries, Inc. Jason Ford Regulatory Affairs Manager 909 North Kellogg St. Kennewick, Washington 99336
Re: K242424
Trade/Device Name: Bluebird Single-Use Respiratory Effort Belt Regulation Number: 21 CFR 868.2375 Regulation Name: Breathing Frequency Monitor Regulatory Class: Class II Product Code: MNR Dated: November 15, 2024 Received: November 15, 2024
Dear Jason Ford:
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 (the 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. Although this letter refers to your product as a device, please be aware that some cleared products may instead be combination products. The 510(k) Premarket Notification Database available at https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfpmn/pmn.cfm identifies combination product submissions. 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.
Additional information about changes that may require a new premarket notification are provided in the FDA guidance documents entitled "Deciding When to Submit a 510(k) for a Change to an Existing Device"
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(https://www.fda.gov/media/99812/download) and "Deciding When to Submit a 510(k) for a Software Change to an Existing Device" (https://www.fda.gov/media/99785/download).
Your device is also subject to, among other requirements, the Quality System (QS) regulation (21 CFR Part 820), which includes, but is not limited to, 21 CFR 820.30. Design controls; 21 CFR 820.90. Nonconforming product; and 21 CFR 820.100, Corrective and preventive action. Please note that regardless of whether a change requires premarket review. the OS regulation requires device manufacturers to review and approve changes to device design and production (21 CFR 820.30 and 21 CFR 820.70) and document changes and approvals in the device master record (21 CFR 820.181).
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 Part 803) for devices or postmarketing safety reporting (21 CFR Part 4, Subpart B) for combination products (see https://www.fda.gov/combination-products/guidance-regulatory-information/postmarketing-safety-reportingcombination-products); good manufacturing practice requirements as set forth in the quality systems (QS) regulation (21 CFR Part 820) for devices or current good manufacturing practices (21 CFR Part 4, Subpart A) for combination products; and, if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR Parts 1000-1050.
All medical devices, including Class I and unclassified devices and combination product device constituent parts are required to be in compliance with the final Unique Device Identification System rule ("UDI Rue"). The UDI Rule requires, among other things, that a device bear a unique device identifier (UDI) on its label and package (21 CFR 801.20(a)) unless an exception or alternative applies (21 CFR 801.20(b)) and that the dates on the device label be formatted in accordance with 21 CFR 801.18. The UDI Rule (21 CFR 830.300(a) and 830.320(b)) also requires that certain information be submitted to the Global Unique Device Identification Database (GUDID) (21 CFR Part 830 Subpart E). For additional information on these requirements, please see the UDI System webpage at https://www.fda.gov/medical-devices/device-advicecomprehensive-regulatory-assistance/unique-device-identification-system-udi-system.
Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR 807.97). For questions regarding the reporting of adverse events under the MDR regulation (21 CFR Part 803), please go to https://www.fda.gov/medical-device-safety/medical-device-reportingmdr-how-report-medical-device-problems.
For comprehensive regulatory information about mediation-emitting products, including information about labeling regulations, please see Device Advice (https://www.fda.gov/medicaldevices/device-advice-comprehensive-regulatory-assistance) and CDRH Learn (https://www.fda.gov/training-and-continuing-education/cdrh-learn). 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 (https://www.fda.gov/medical-device-advice-comprehensive-regulatoryassistance/contact-us-division-industry-and-consumer-education-dice) for more information or contact DICE by email (DICE@fda.hhs.gov) or phone (1-800-638-2041 or 301-796-7100).
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Sincerely,
### Rachana Visaria -S
Rachana Visaria, Ph.D. Assistant Director DHT1C: Division of Anesthesia, Respiratory, and Sleep Devices OHT1: Office of Ophthalmic, Anesthesia, Respiratory, ENT, and Dental Devices Office of Product Evaluation and Quality Center for Devices and Radiological Health
Enclosure
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#### Indications for Use
510(k) Number (if known) K242424
Device Name Bluebird Single-Use Respiratory Effort Belt
#### Indications for Use (Describe)
The Bluebird Single-Use Respiratory Effort Belt is intended to measure respiratory effort to assist in the diagnosis of sleep disorders or sleep related respiratory disorders. The respiratory effort belt signals are suitable for connection to sleep/polysomnography (PSG) systems. The intended environments are hospitals, institutions, sleep clinics, or other test environments, including the patient's home.
The Bluebird Single-Use Respiratory Effort Belt is intended for diagnostic purposes only on patients greater than 2 years of age and is not intended to be used as an apnea monitor.
Type of Use (Select one or both, as applicable)
| <span style="font-family: sans-serif;"> <input checked="true" type="checkbox"/> Prescription Use (Part 21 CFR 801 Subpart D) </span> | <span style="font-family: sans-serif;"> <input type="checkbox"/> Over-The-Counter Use (21 CFR 801 Subpart C) </span> |
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### K242424 510(k) Summary
#### Submitter Information
| Submitter Name: | Cadwell Industries, Inc. |
|------------------------|-----------------------------|
| | 909 N. Kellogg Street |
| | Kennewick, Washington 99336 |
| Submitter Phone: | 509-735-6481 |
| Contact Person: | Jason Ford |
| | Regulatory Affairs Manager |
| Date Summary Prepared: | November 15, 2024 |
| Subject Device | |
Trade Name: Common Name: Classification Name:
Bluebird Single-Use Respiratory Effort Belt Respiratory Effort Sensor 21 CFR 868.2375. Ventilatory Effort Recorder, Breathing Frequency Monitor Class II MNR
### Product Code:
#### Predicate Device
510(k) Number: Trade Name: Submitter Name: Classification Name: Product Code:
K173793 XactTrace® Single Use Respiratory Effort Belt System Natus Neurology 21 CFR 868.2375, Breathing Frequency Monitor MNR
#### Reference Predicate Device
| 510(k) Number: | K151361 |
|----------------------|----------------------------------------------|
| Trade Name: | Nox RIP Belts and Nox RIP Belt Cables |
| Submitter Name: | Nox Medical |
| Classification Name: | 21 CFR 868.2375, Breathing Frequency Monitor |
| Product Code: | MNR |
#### Device Description
The Bluebird Single-Use Respiratory Effort Belt (Bluebird) is used to measure chest and abdomen expansion and contraction during respiration. The sensor consists of a sinusoidal wire coil attached along the length of an elastic belt. The inductance of the sensor changes as the belt is stretched. The Bluebird is suitable for connection to the inputs of physiological recording equipment. The Bluebird measures inductance and generates an output signal proportional to the amount of stretch. The elastic belt is held in place by a quick release buckle with a cinch function and the belt is adjusted to fit snugly but comfortably. Electrical connection to the two ends of the embedded coil is through a 1.5mm female touch proof connection jack on each side of belt buckle. The materials are elastics and plastics used in the clothing industry, and fine gauge copper wire for the embedded coil.
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## VELL K242424 510(k) Summary
#### Indications for Use
The Bluebird Single-Use Respiratory Effort Belt is intended to measure respiratory effort to assist in the diagnosis of sleep disorders or sleep related respiratory disorders. The respiratory effort belt signals are suitable for connection to sleep/polysomnography (PSG) systems. The intended environments are hospitals, institutions, sleep clinics, or other test environments, including the patient's home.
The Bluebird Single-Use Respiratory Effort Belt is intended for diagnostic purposes only on patients greater than 2 years of age and is not intended to be used as an apnea monitor.
#### Summary of Technological Characteristics and Comparison to the predicate device
The Bluebird employs the same technological characteristics as the predicate device. The following table provides a side-by-side comparison of the Indications for Use and technological characteristics of the subject and predicate devices.
| Feature | XactTrace Single-Use<br>Respiratory Effort Belt System<br>(Predicate K173793) | Bluebird Single-Use Respiratory<br>Effort Belt<br>(Subject Device) | Equivalence Comments,<br>Discussion |
|-----------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Indications for Use | The XactTrace® Single Use<br>Respiratory Effort Belt System is<br>intended to measure respiratory<br>effort to assist in the diagnosis of<br>sleep disorders or sleep related<br>respiratory disorders. The<br>respiratory effort signals<br>measured are processed to<br>provide electrical signals<br>suitable for connection to the<br>inputs of physiological recording<br>equipment. The intended<br>environments are hospitals,<br>institutions, sleep centers, sleep<br>clinics. The XactTrace Single<br>Use Respiratory Effort Belt<br>System is intended for<br>diagnostics purposes only and is<br>not intended to be used as an<br>apnea monitor. | The Bluebird Single-Use<br>Respiratory Effort Belt is<br>intended to measure respiratory<br>effort to assist in the diagnosis<br>of sleep disorders or sleep<br>related respiratory disorders.<br>The respiratory effort belt<br>signals are suitable for<br>connection to<br>sleep/polysomnography (PSG)<br>systems. The intended<br>environments are hospitals,<br>institutions, sleep centers, sleep<br>clinics, or other test<br>environments, including the<br>patient's home.<br>The Bluebird Single-Use<br>Respiratory Effort Belt is<br>intended for diagnostic<br>purposes only on patients<br>greater than 2 years of age and<br>is not intended to be used as an<br>apnea monitor. | There are no significant differences<br>in the indications for use between the<br>subject and predicate device. The<br>specific use for patients 2 years and<br>older is the same as found in the<br>reference device, K151361. |
| Population of use | Adult and pediatric | greater than 2 years of age | No significant differences, see above<br>comment to reference predicate. |
| Environment of Use | Hospitals, institutions, sleep<br>centers, sleep clinics or other test<br>environments, including the<br>patient's home. | Hospitals, institutions, sleep<br>centers, sleep clinics, or other<br>test environments, including the<br>patient's home. | Equivalent |
| Single patient use | Yes | Yes | Equivalent |
| Duration of use | Duration of<br>clinical uses, anticipated to be ≤<br>12 hours. | Duration of<br>clinical uses, anticipated to be ≤<br>12 hours. | Equivalent |
| Fundamental<br>technology | Respiratory Inductive<br>Plethysmography (RIP) | Respiratory Inductive<br>Plethysmography (RIP) | Equivalent |
| Compatible<br>recording<br>technology | Physiological recording equipment | Physiological recording<br>equipment | Equivalent |
| Belt Length<br>Variations | Pre-sized | Pre - sized | Equivalent |
| Patient applied location | Abdomen and Thorax | Abdomen and Thorax | Equivalent |
| Pre-Sized Belt Sizes<br>(Circumference) | Pre-sized variations of large,<br>medium, small and pediatric<br>(inches).<br>Large: 40 to 75<br>Medium: 30 to 55<br>Small: 16 to 35<br>Pediatric: 11 to 22 | Pre-sized variations of large,<br>medium, small and pediatric<br>(inches).<br>Large: 40 to 75<br>Medium: 30 to 55<br>Small: 16 to 35<br>Pediatric: 11 to 22 | Equivalent |
| Patient contact | Not in direct contact with bare<br>skin. | Not in direct contact with bare<br>skin. | Equivalent |
| Belt connectors | Touchproof safety connection,<br>complying with DIN 42 802 for<br>Touchproof connection systems. | Touchproof safety connection,<br>complying with DIN 42 802 for<br>Touchproof connection systems. | Equivalent |
| Belt Material | Elastic Band with Wire | Elastic Band with Wire | Equivalent |
| Buckle Material | ABS | Polypropylene | Equivalent. Both materials are<br>commonly used for plastic mold<br>injection during the manufacturing<br>process. The differences in material<br>do not affect the safety or efficacy of<br>the device. |
| Performance Testing | Dimensional requirements<br>Buckle functionality<br>Compatibility with a PSG<br>recorder<br>Equivalence of breathing effort<br>signal output | Dimensional requirements<br>Buckle functionality<br>Compatibility with a PSG<br>recorder<br>Equivalence of breathing effort<br>signal output | The performance testing for the<br>subject device are equivalent to the<br>predicate within the characteristics<br>of Dimensional requirements,<br>Buckle functionality, Compatibility<br>with a PSG recorder and equivalency<br>of breathing signal output. |
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# / 日_ K242424 510(k) Summary
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## K242424 510(k) Summary
humidity Resistance EMC compliance Cleaning
is not required since the subject device is a single use device. EMC and operational testing is not required for the subject device and is mitigated by the PSG recording device requirements. Therefore, these differences do not affect the safety or efficacy of the subject device.
#### Performance Testing
Nonclinical tests were performed on the subject device in order to show the technological equivalency to the predicate device and to verify the compliance to design requirements. No special controls exist for this type of device. Device testing included dimensional requirements, continuity. belt buckle function, ability to connect the subject device to a standard PSG recording device, recorded respiratory effort signal quality, packaging testing and comparative performance testing to the predicate.
The comparative performance testing provided direct performance comparison to the actual recorded output signal of each device. Performance testing was performed for the Bluebird rip belt connected to a Cadwell recording device and simultaneously to an XactTrace belt, therefore both belts acting as passive devices, connected to the same Cadwell PSG recorder. The resulting waveforms are the same for both belts.
#### Conclusion
The passing results of the nonclinical tests and the technological and Indications for Use comparison demonstrate the Bluebird Single-Use Respiratory Effort Belt is substantially equivalent to the legally marketed predicate device.
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.