PALS® reusable, self-adhering, over-the-counter Neurostimulation Electrodes are indicated for use with transcutaneous electrical stimulation devices. Some common types of transcutaneous stimulation devices include, but are not limited to, transepithelial nerve stimulation (TENS) and electrical muscle stimulation (EMS) devices. Transcutaneous Neurostimulation Electrodes are passive devices serving as an interface between a user's skin and a neurostimulation device.
Device Story
PALS® Neurostimulation Electrodes are passive, reusable, self-adhering cutaneous electrodes. They function as an interface between a user's skin and an external neurostimulation device (TENS or EMS). The device receives electrical signals from the stimulator via a lead wire or snap connector, disperses the signal across a stretchable conductive fabric, and transmits it through a conductive hydrogel layer to the user's skin. The device is intended for over-the-counter use. By providing a stable electrical interface, the electrodes facilitate the delivery of therapeutic stimulation to the patient, potentially aiding in pain management or muscle stimulation as determined by the connected stimulator.
Clinical Evidence
No clinical data provided. Substantial equivalence is supported by bench testing, including biocompatibility testing of the conductive hydrogel and electrical performance testing of the lead wire components and current distribution.
Technological Characteristics
Passive cutaneous electrode; components include top cover, connector lead wire, stretchable conductive fabric, and conductive hydrogel. Connectivity via lead wire or snap connector to external neurostimulation devices. No active electronic components or software.
Indications for Use
Indicated for use with transcutaneous electrical stimulation devices (e.g., TENS, EMS) as an interface between user skin and the stimulator.
Regulatory Classification
Identification
A cutaneous electrode is an electrode that is applied directly to a patient's skin either to record physiological signals (e.g., the electroencephalogram) or to apply electrical stimulation.
ValuTrode® Neurostimulation Over the Counter Electrodes (K130987)
Submission Summary (Full Text)
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Image /page/0/Picture/0 description: The image shows the logo for Axelgaard Manufacturing Co., LTD. The logo features a stylized "A" with horizontal lines inside, followed by the text "AXELGAARD" in bold, uppercase letters. Below "AXELGAARD" is the text "MANUFACTURING CO., LTD." in a smaller font size.
FEB 1 3 2014
005 PALS 510K_Summary_2_5_2014
510(k) Summary 807.92(c)
| Submitter/Contact Person | Dan Jeffery, President<br>Axelgaard Manufacturing Co., Ltd.<br>520 Industrial Way<br>Fallbrook, CA 92028<br>Phone: 760-451-8000 Fax: 760-723-2350<br>Dan.jeffery@axelgaard.com |
|--------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Device Identification | |
| Common Name: | Electrodes, Cutaneous |
| Trade Name/Common Name: | PALS® Neurostimulation Electrodes |
| Regulation No.: | 21CFR 882.1320 Electrodes, Cutaneous |
| Classification: | Class II |
| Product Code: | GXY |
### Device Description (807.92[a] [4])
The Axelgaard PALS® Neurostimulation reusable self-adhering electrode is used as a transcutaneous electrical nerve stimulation electrode in conjunction with an electrical stimulator for TENS or EMS.
### Technical Characteristics
The device functions as a passive device by carrying an electrical signal from a neurostimulation device through the device cable and electrode lead wire to the user skin. It is composed of a cover, connector lead wire, strelchable conductive fabric, conductive hydrogel, and an electrode carrier distribution is delivered via a connector lead wire stripped to an additional length.
Axelgaard Manufacturing manufactures the PALS® Neurostimulation Over the Counter Electrode and the ValuTrode Over the Counter Neurostimulation Electrodes (K13987) with the same conductive hydrogel, and electrode carrier.
Everyway Medical manufactures the Lifecare Electrode (K083302) with the same conductive hydrogel and conductive carbon film as Axelgaard's ValuTrode Neurostimulation Electrodes (K130987). Axelgaard Manufacturing supplies these components to Everyway.
### Intended Use (807.92[a] [5])
PALS® reusable, self-adhering, over-the-counter Neurostimulation Electrodes are indicated for use with transcutaneous electrical stimulation devices. Some common types of transcutaneous stimulation devices include, but are not limited to, transepithelial nerve stimulation (TENS) and electrical muscle stimulation (EMS) devices. Transcutaneous Neurostimulation Electrodes are passive devices serving as an interface between a user's skin and a neurostimulation device.
### Legally Marketed Predicate Devices (807.92[a] [3]}
| Device Name | Manufacturer | 510(k) No. | Date Cleared | | Subject Device<br>Axelgaard PALS® Neurostimulation OTC | Axelgaard PALS Flex<br>(K874469) | Everyway Lifecare<br>(K083302) | Axelgaard ValuTrode OTC<br>(K130987) | | Subject Device<br>Axelgaard PALS® Neurostimulation<br>OTC | Axelgaard PALS® Flex<br>(K874469) | Everyway Lifecare<br>(K083302) | Axelgaard ValuTrode OTC<br>(K130987) |
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| PALS® Flex Neurostimulation Electrodes | Axelgaard Manufacturing Co., Ltd. | K874469 | 1998 | | Cutaneous electrode which conducts an<br>electrical signal from a neurostimulation<br>device through a leadwire; which is<br>dispersed from the leadwire across a<br>stretchable conductive fabric then<br>transmitted through the conductive<br>adhesive gel to the surface of the user's<br>skin. | Cutaneous electrode which conducts<br>an electrical signal from a<br>neurostimulation device through a<br>leadwire; which is dispersed from the<br>wire across a stretchable conductive<br>fabric then transmitted through the<br>conductive adhesive gel to the surface<br>of the user's skin. | Cutaneous electrode which<br>conducts an electrical signal<br>from a neurostimulation<br>device through a leadwire;<br>which is dispersed from the<br>wire across a conductive<br>surface; then transmitted<br>through the conductive<br>adhesive gel to the surface<br>of the user's skin. The<br>electrode connection point<br>(leadwire) is compatible with<br>standard, marketed<br>Neurostimulation devices.<br>The device is safe and<br>effective as the predicate<br>devices cited (within their<br>510(k) submittal). | Cutaneous electrode which conducts<br>an electrical signal from a<br>neurostimulation device through a<br>leadwire (or snap); which is<br>dispersed from the leadwire/snap<br>across a conductive surface; then<br>transmitted through the conductive<br>adhesive gel to the surface of the<br>user's skin. | Features /<br>Materials | Four basic components:<br>Top cover material Lead wire connection Lead wire has insulation on female connector Stretchable conductive fabric Conductive hydrogel | Four basic components:<br>Top cover material Lead wire connection Lead wire has insulation on female connector Stretchable conductive fabric Conductive hydrogel | Four basic components:<br>Top cover material Lead wire connection Lead wire has insulation on female connector Conductive carbon film Conductive hydrogel | Four basic components:<br>Top cover material Lead wire or snap connection Lead wire has insulation on female connector Conductive carbon film Conductive hydrogel |
| Life Care Electrodes | Everyway Medical Instruments Co. | K083302 | 2009 | | Safety & Effectiveness-<br>Based on successful biocompatibility<br>testing of the skin contacting conductive<br>hydrogel, the electrical performance of<br>the insulated leadwire components and<br>electrode current distribution test results,<br>the PALS® Neurostimulation devices<br>are safe and effective when used as an<br>interface between a user's skin and an<br>approved neurostimulation devices. | Safety & Effectiveness-<br>Based on successful biocompatibility<br>testing of the skin contacting<br>conductive hydrogel, the electrical<br>performance of the insulated leadwire<br>components and electrode current<br>distribution test results, the PALS®<br>Flex neurostimulation devices are safe<br>and effective when used as an<br>interface between a user's skin and an<br>approved neurostimulation devices. | | Safety & Effectiveness-<br>Based on successful biocompatibility<br>testing of the skin contacting<br>conductive hydrogel, the electrical<br>performance of the snap/insulated<br>leadwire components and electrode<br>current distribution test results, the<br>ValuTrode neurostimulation devices<br>are safe and effective when used as<br>an interface between a user's skin<br>and an approved neurostimulation<br>devices. | Indications of<br>Use | PALS® reusable, self-adhering, over-the-counter Neurostimulation<br>Electrodes are indicated for use with transcutaneous electrical stimulation devices. | The Axelgaard PALS® Flex electrode is a reusable disposable device which adheres to the patient over the entire surface of the electrode. The device is intended to be used in connection with any neurostimulation approved for distribution within the USA. | Electrodes are intended for use with transcutaneous neurostimulation devices as over the counter devices. | ValuTrode® reusable, self-adhering, over-the-counter Neurostimulation<br>Electrodes are indicated for use with transcutaneous electrical stimulation devices. |
| ValuTrode® Neurostimulation Over the<br>Counter Electrodes | Axelgaard Manufacturing Co., Ltd. | K130987 | 2013 | | Our labeling indicates consulting the<br>stimulator manual for proper electrode<br>size and placement. Do not exceed 0.1<br>watts/cm2. | Our labeling states: "Consult stimulator<br>manual for proper electrode size. Do<br>not exceed 0.1 watts/cm2." | | Our labeling indicates consulting the<br>stimulator manual for proper<br>electrode size and placement. Do not<br>exceed 0.1 watts/cm2. | Principles of<br>Operation | Some common types of transcutaneous stimulation devices include, but are not limited to, transepithelial nerve stimulation (TENS) and electrical muscle stimulation (EMS) devices.<br><br>Transcutaneous Neurostimulation Electrodes are passive devices serving as an interface between a user's skin and a neurostimulation device. | | Some common type of neurostimulation devices include, but are not limited to, TENS and EMS devices.<br><br>Transcutaneous neurostimulation electrodes are passive devices serving as an interface between a patient's skin and a neurostimulation device. | Some common types of transcutaneous stimulation devices include, but are not limited to, transepithelial nerve stimulation (TENS) and electrical muscle stimulation (EMS) devices.<br><br>Transcutaneous Neurostimulation Electrodes are passive devices serving as an interface between a user's skin and a neurostimulation device. |
| | FDA max power guidelines draft<br>guidance 2010 states in Section D.(vi)<br>a maximum average power density<br>that does not exceed .025 watts per<br>square centimeter of electrode<br>conductive surface area. | FDA max power guidelines draft<br>guidance 2010 states in Section<br>D.(vi) a maximum average power<br>density that does not exceed .025<br>watts per square centimeter of<br>electrode conductive surface area. | | FDA max power guidelines draft<br>guidance 2010 states in Section<br>D.(vi) a maximum average power<br>density that does not exceed .025<br>watts per square centimeter of<br>electrode conductive surface area. | Differences | PALS® Neurostimulation electrodes will offer lead wire connection configurations.<br><br>PALS® electrodes utilize a stretchable conductive fabric.<br><br>We claim that these electrodes can be sold as OTC (over-the-counter) under the 510(k) regulation (21 CFR 801 Subpart C) requiring 510(k) submittal. | PALS® Flex electrodes offer lead wire connection configurations<br><br>PALS® Flex electrodes utilize a stretchable conductive fabric.<br><br>The devices are sold as prescription only devices. | The Lifecare Electrode 510(k) only offers lead wire connection electrodes.<br><br>Lifecare Electrodes utilize conductive film.<br><br>Lifecare Electrodes are sold as over-the-counter devices. | ValuTrode® over the counter electrodes offer lead wire and snap connection configurations.<br><br>Axelgaard ValuTrode® electrodes utilize conductive film.<br><br>The devices are sold as over-the-counter devices. | | | | |
(The Substantial Equivalency Summary and subsequent pages are formatted in landscape orientation for ease of reading.)
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JA = AXELGAARD
Substantial Equivalence Summary (807.92[a] [6])
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NS MANUFACTURING CO., LTD.
005-3
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Image /page/3/Picture/0 description: The image shows the logo for AXELGAARD MANUFACTURING CO., LTD. The text is vertically oriented, with AXELGAARD stacked on top of each other on the left side of the image. MANUFACTURING CO., LTD. is stacked on top of each other on the right side of the image.
## Performance Data
No performance data is required to support the proposed overhe-counter PALS® Neustimulation Electode has ieafical technol
characteristics (including design) as compared to be
# Safety / Effectiveness and Conclusion Statement (860.
xelgaard Manufacturing Co., Ltd. considers the PALS® over the-counter Neurostimulation electrode to be as safe and effective as the predicated devices PAL
lex (K874469) and
upon an evaluation of the proposed PALS® electrode, compared with he Lifest on the closes, Axegard Manufacum
d. believes that the proposed PALS® self alheing reusable Neurost
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Image /page/4/Picture/0 description: The image shows the logo for the U.S. Department of Health and Human Services. The logo consists of a stylized eagle with three stripes forming its body and wing. The eagle is facing to the right. The text "DEPARTMENT OF HEALTH & HUMAN SERVICES - USA" is arranged in a circular fashion around the eagle.
DEPARTMENT OF HEALTH & HUMAN SERVICES
Public Health Service
Food and Drug Administration 10903 New Hampshire Avenue Document Control Center - WO66-G609 Silver Spring, MD 20993-0002
February 13, 2014
Axelgaard Manufacturing Co., Ltd. Mr. Dan Jeffery, President 520 Industrial Way Fallbrook, CA 92028
Re: K132422
Trade/Device Name: PALS® Neurostimulation Electrodes Regulation Number: 21 CFR 882.1320 Regulation Name: Cutaneous Electrodes Regulatory Class: Class II Product Code: GXY Dated: November 18, 2013 Received: November 19, 2013
Dear Mr. Jeffery:
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 (reporting of medical device-related adverse events) (21 CFR 803); good manufacturing practice requirements as set
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Page 2 - Mr. Dan Jeffery
.
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 Small Manufacturers, International and Consumer Assistance at its tollfree 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" (21CFR 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 Small Manufacturers, International and Consumer Assistance 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,
## Joyce M. Whang -S
Carlos Peña, PhD, MS for Director Division of Neurological and Physical Medicine Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
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### DEPARTMENT OF HEALTH AND HUMAN SERVICES Food and Drug Administration
### Indications for Use
Form Approved: OMB No. 0910-0120 Expiration Date: January 31, 2017 See PRA Statement on last page.
### 510(k) Number (if known) K132422
### Device Name
### PALS® Neurostimulation Electrodes
### Indications for Use (Describe)
PALS® reusable, self-adhering, over-the-counter Neurostimulation Electrodes are indicated for use with transcutaneous electrical stimulation devices. Some common types of transcutaneous stimulation devices include, but are not limited to, transepithelial nerve stimulation (TENS) and electical muscle stimulation (EMS) devices. Transcutaneous Neurostimulation Electrodes are passive devices serving as an interface between a user's skin and a neurostimulation device.
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)
### PLEASE DO NOT WRITE BELOW THIS LINE - CONTINUE ON A SEPARATE PAGE IF NEEDED.
### FOR FDA USE ONLY
.
Concurrence of Center for Devices and Radiological Health (CDRH) (Signature)
FORM FDA 3881 (1/14)
PSC Publishing Scrivices (301) 443-6740 2
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This section applies only to requirements of the Paperwork Reduction Act of 1995.
### *DO NOT SEND YOUR COMPLETED FORM TO THE PRA STAFF EMAIL ADDRESS BELOW.*
The burden time for this collection of information is estimated to average 79 hours per response, including the time to review instructions, search existing data sources, gather and maintain the data needed and complete and review the collection of information. Send comments regarding this burden estimate or any other aspect of this information collection, including suggestions for reducing this burden, to:
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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.