Acquisition of intraoral X-Ray image of the human dental arch. In particular: • The STARX-1/ STARX PRO-1 sensors (active area 20 x 30 mm) allow to acquire the majority of intraoral images both vertically and horizontally. • The STARX-2/ STARX PRO-2 sensors (active area 26 x 34 mm) allow to acquire horizontal bitewing images.
Device Story
Digital intraoral sensors (StarX-1, StarX-2, StarX PRO-1, StarX PRO-2) capture X-ray images of human dental arch. Sensors utilize CMOS technology with either Cesium Iodide (CsI) or Gadolinium Oxysulfide (GOS) scintillators to convert X-ray radiation into light, then to digital signals via fiber optic plates and CMOS chips. Devices connect via USB to a PC; up to three sensors connect simultaneously. Operated by dental professionals in clinical settings. Device acts as receiver only; does not control X-ray generators. Output is digital image data transmitted via TWAIN module to third-party patient management software for display, enhancement, and diagnostic review. Benefits include high-resolution digital imaging for dental diagnosis, replacing traditional film.
Clinical Evidence
Bench testing only. Clinical evaluation consisted of professional review of sample clinical images to confirm diagnostic quality and adequacy per FDA guidance for solid-state digital X-ray panels. No formal clinical trial with primary endpoints or statistical metrics reported.
Indicated for acquisition of intraoral X-ray images of the human dental arch for dental diagnostic purposes.
Regulatory Classification
Identification
An extraoral source x-ray system is an AC-powered device that produces x-rays and is intended for dental radiographic examination and diagnosis of diseases of the teeth, jaw, and oral structures. The x-ray source (a tube) is located outside the mouth. This generic type of device may include patient and equipment supports and component parts.
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August 30, 2021
Image /page/0/Picture/1 description: The image shows the logo of the U.S. Food and Drug Administration (FDA). On the left is the Department of Health & Human Services logo. To the right of that is the FDA logo, which is a blue square with the letters "FDA" in white. To the right of the blue square is the text "U.S. FOOD & DRUG ADMINISTRATION" in blue.
FONA S.r.1. % Krupa Srivastava RA Consultant Via G. Galilei 11 Assago, Milan 20057 ITALY
Re: K212103
Trade/Device Name: StarX-1, StarX-2, StarX PRO-1 and StarX PRO-2 Regulation Number: 21 CFR 872.1800 Regulation Name: Extraoral source x-ray system Regulatory Class: Class II Product Code: MUH Dated: June 30, 2021 Received: July 6, 2021
Dear Krupa Srivastava:
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. 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 located 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.
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
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801); medical device reporting of medical device-related adverse events) (21 CFR 803) for devices or postmarketing safety reporting (21 CFR 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 4, Subpart A) for combination products; 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 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).
Sincerely,
, for
Thalia T. Mills, Ph.D. Director Division of Radiological Health OHT7: Office of In Vitro Diagnostics and Radiological Health 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) K212103
Device Name StarX-1, StarX-2, StarX PRO-1 and StarX PRO-2
Indications for Use (Describe)
Acquisition of intraoral X-Ray image of the human dental arch. In particular:
• The STARX-1/ STARX PRO-1 sensors (active area 20 x 30 mm) allow to acquire the majority of intraoral images both vertically and horizontally.
· The STARX-2/ STARX PRO-2 sensors (active area 26 x 34 mm) allow to acquire horizontal bitewing images.
| Type of Use (Select one or both, as applicable) | |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| <span style="font-size: 10pt;"> <span style="font-family: Symbol;"> <span style="font-size: 10pt;">☑</span> </span> Prescription Use (Part 21 CFR 801 Subpart D) </span> | <span style="font-size: 10pt;"> <span style="font-family: Symbol;"> <span style="font-size: 10pt;">☐</span> </span> Over-The-Counter Use (21 CFR 801 Subpart C) </span> |
---
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Image /page/3/Picture/0 description: The image shows the logo for FONA. The word "FONA" is written in large, gray, sans-serif letters. Above the word is a yellow arc. Below the word "FONA" are the words "CLOSER TO YOU" in smaller, gray, sans-serif letters.
#### K212103
510(k) SUMMARY
Date Prepared:
June 30, 2021
Submitters Information Name
Address
Contact Person
Contact Telephone
FONA s.r.l. Via G.Galilei 11 20057 Assago (MI), Italy Luigi Germanò +39 0245712171
## Device Information
StarX-1, StarX-2, StarX PRO-1 and StarX Device/ Trade Name PRO-2 Intraoral Digital X-Ray Sensor Common Name Classification Name Extraoral source x-ray system 21 CFR 872.1800 Classification Regulation MUH Product code
## Predicate Devices:
The following legally marketed predicate device has been chosen for the determination of substantial equivalence:
| Trade Name | Quick Ray HD |
|---------------------------|-------------------------------|
| 510(k) Number | K151926 |
| Classification Name | Extraoral source x-ray system |
| Classification Regulation | 21 CFR 872.1800 |
| Product code | MUH |
## Indications for use
Acquisition of intraoral X-Ray image of the human dental arch. In particular:
- The STARX-1/ STARX PRO-1 sensors (active area 20 x 30 mm) allow to ● acquire the majority of intraoral images both vertically and horizontally.
- The STARX-2/ STARX PRO-2 sensors (active area 26 x 34 mm) allow to ● acquire horizontal bitewing images.
Traditional 510(k)- StarX & StarX PRC
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Image /page/4/Picture/0 description: The image shows the logo for FONA. The word "FONA" is written in large, bold, gray letters. Above the word "FONA" is a curved yellow line. Below the word "FONA" are the words "CLOSER TO YOU" in smaller, gray letters.
#### Device Description:
The StarX-1, StarX-2, StarX PRO-1 and the StarX PRO-2 are digital intraoral sensors based on CMOS technology for intraoral X-Ray image acquisition of the human dental arch. The sensors are available in two sizes; in particular:
- . StarX-1 / StarX PRO-1 sensors: active area 20 x 30 mm
- . StarX-2 / StarX PRO-2 sensors: active area 26 x 34 mm
The differences between the sensors are the sizes and the different kind of scintillator (Cesium lodide - Csl and Gadolinium Oxysulfide - GOS).
StarX-1, StarX-2, StarX PRO-1 and StarX PRO-2 are directly connected to the acquisition PC through the USB connection. Up to three sensors can be connected to one PC at time.
The type of X-ray systems that integrate with the sensors are wall-mounted Xray intraoral generators (both AC and DC) with a tube current between 1 and 15 mA inclusive, and with a tube voltage between 50 and 100 kV inclusive, with in-built controls to set exposure parameters. Generators allow variable mA/kV to be selected, which will control the exposure time.
The sensor is supplied with an acquisition (TWAIN) module to acquire images from the sensor via the USB. The user can further process these images via a patient management software to process, filter and modify images using a software such as the Oris Win DG software which is not part of this submission.
The device cannot act as an x-ray generator controller. All control of x-ray generation is done by controls built into the generator itself. There is no connection between the subject device and the x-ray generator. The subject device does not control the generator, it is a receiver only.
Before FONA sells this device, the team discuss the hardware and software requirements of the user to make sure that their systems are compatible with the FONA sensors.
FONA provides technical support for this device to ensure proper operation and to answer any questions regarding the functioning of the device. Contact details are provided to all end users and in the user manual.
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Image /page/5/Picture/0 description: The image shows the logo for FONA. The word "FONA" is written in large, gray, sans-serif letters. Below the word "FONA" is the phrase "CLOSER TO YOU" in smaller, gray, sans-serif letters. Above the word "FONA" is a yellow swoosh.
#### Substantial Equivalence:
The subject device and predicate device are identical in firmware/hardware and supplied by the same company, Hamamatsu. The firmware in the FONA devices has already been cleared in the Predicate Device.
The sensor technology and principle of operation remain the same. The FONA StarX-1 and StarX-2 utilise the GOS scintillator which work on similar principles as the CSi scintillator found in the StarX PRO and the predicate devices. Clinical as well as the Non-Clinical testing performed on these FONA devices do not raise any concern of safety or effectiveness as compared to the predicate device.
The predicate device comes with Xray Vision (OTS package from Apteryx, USA) which performs image acquisition, archiving, image enhancements, electronic transmission and diagnostic review system.
The FONA sensor is supplied only with an acquisition (TWAIN) module to acquire images from the sensor via the USB. The user can further process these images via a patient management software to process, filter and modify images using a software such as the Oris Win DG software which is not part of this submission.
A comparison of the FONA sensors to the predicate device is tabulated below:
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| | Subject Device | Predicate Device |
|--------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Device Name | STARX-1, STARX-2, STARX PRO-1 and STARX PRO-2 | Quick Ray HD |
| Manufacturer Name | FONA S.r.l | Denterprise International |
| Device Classification<br>Regulation | 21 CFR 872.1800 | 21 CFR 872.1800 |
| Common Name | Intraoral Digital X-Ray Sensor | Intraoral Digital X-Ray Sensor |
| Classification Name | Extraoral Source X-Ray System | Extraoral Source X-Ray System |
| Product Code(s) | MUH | MUH |
| Regulatory Class | 2 | 2 |
| 510(k) | Not yet assigned | K151926 |
| Intended Use | The acquisition of intraoral X-Ray image of the<br>human dental arch. In particular:<br>• The size 1 sensor allows to acquire the majority<br>of intraoral images both vertically and<br>horizontally.<br>• The size 2 sensor allows to acquire horizontal<br>bitewing images. | Radiographic examination to assist<br>with diagnosis of diseases of the teeth,<br>jaw, and oral structure.<br>The QuickRay HD dental sensor is<br>intended to replace film and to capture an<br>intraoral x-ray image, when exposed to X-<br>rays, for dental diagnostic purposes. |
| Software | TWAIN (Standard) Module which is a communication<br>protocol used for image acquisition only. It works with<br>any compatible patient management system. | Xray Vision (OTS package from Apteryx,<br>USA) K983111- performs image<br>acquisition, archiving, image<br>enhancements, electronic transmission<br>and diagnostic review system. |
| Principles of<br>Operation | X-ray (radiation) => scintillator (convert to light) =><br>fiber optic (filtering) => CMOS (convert to digital) =><br>electronics => PC (capture & display image) | X-ray (radiation) => scintillator (convert to<br>light) => fiber optic (filtering) => CMOS<br>(convert to digital) => electronics => PC<br>(capture & display image) |
| | Subject Device | Predicate Device |
| Device Name | STARX-1, STARX-2, STARX PRO-1 and STARX<br>PRO-2 | Quick Ray HD |
| Software-Firmware | Firmware combined on sensor electronic board | Firmware combined on sensor electronic<br>board |
| Sensor technology | STARX PRO: CMOS + Optical fiber plate + CSi<br>STARX: CMOS+ Optical Fiber plate + GOS | CMOS chip + optical fiber plate + CSi |
| Matrix dimensions<br>(mm²) | (Size 1) STARX-1 and STARX PRO-1: 600mm²<br>(Size 2) STARX-2 and STARX PRO-2: 884mm² | Active area: 600mm² (Size 1)<br>884mm² (Size 2) |
| Matrix dimensions<br>(pixels) | 1000 x 1500 (STARX-1 and STARX PRO-1)<br>1300 x 1700 (STARX-2 and STARX PRO-2) | 1000 lines X 1500 columns (Size 1)<br>1300 X 1700 (Size 2). |
| Resolution | STARX 12lp/mm<br>STARX PRO 20lp/mm | Real ≥ 20lp/mm |
| Pixel Size | 20x20 µm | 20x20 µm |
| Sterilization | Not sterile. Disinfect and use | Not sterile. Disinfect and use |
| Shelf life/ Lifespan<br>CMOS | Min. 125,000 cycles | Min. 100,000 cycles |
| Grey Levels | 14 bits | 14 bits |
| Sensor Board | All control electronics directly integrated on CMOS<br>sensor chip | All control electronics directly integrated on<br>CMOS sensor chip |
| Sensor shell | Enclosure for sensor is ABS and the flammability is<br>HB of UL-94 (UL File No.49895) | Specific shape design; material is ABS and<br>the flammability is HB if YK- 94 (UL File<br>No. 49895) |
| Cable material and<br>design | Cable consists of PVC, ETFE, Copper, plug<br>connector and sensor connector, diameter ø3.7 ±0.3<br>and cable length of 2 meters | Cable consists of PVC, ETFE, copper, plug<br>connector and sensor connector, diameter<br>ø3.7 ±0.3 and cable length 2 meters. |
| Connection to<br>imaging practice PC | USB 2.0 High-Speed | USB 2.0 High-Speed |
| | Subject Device | Predicate Device |
| Device Name | STARX-1, STARX-2, STARX PRO-1 and STARX<br>PRO- 2 | Quick Ray HD |
| Operating<br>temperature | 0°C to 35°C | 0°C to 35°C |
| Sensor input voltage<br>and current | 5V (via USB connection); 0.15A Max | 5V (via USB connection); 0.15A Max |
| Performance<br>Standards | IEC 60601-1 (Electrical)<br>IEC 60601-1-2 (EMC)<br>IEC 60601-1-6 & IEC 62366-1 (Usability)<br>IEC 61223-3-4 (performance)<br>IEC 62220-1 (DQE-performance)<br>IEC 60529 (IP Code) | IEC 60601-1 (Electrical);<br>IEC 60601-1-2 (EMC)<br>62220-1 (Performance)<br>60529 (IP Code) |
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Image /page/7/Picture/0 description: The image shows the logo for FONA, a company that provides dental imaging solutions. The logo consists of the word "FONA" in large, gray, sans-serif font, with the tagline "CLOSER TO YOU" in smaller, gray, sans-serif font underneath. A yellow arc is positioned above the word "FONA", adding a visual element to the logo.
Traditional 510(k)- StarX & StarX PRO FONA S.r.l
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ll FONA S.r.l.– Socio Unico - Sede legale, 11 - 2005 Assago (M) Mala - Capitale Sociale Sociale Sociale Sociale Social .V.A.: 1283700159 - Isozione Registo Inpose di Milano REA:1606385 - Telefono: +39 02 45712171 - Fax: +39 02 45703385 - E-mail: info@fonaitaly.com - Web: www.fonadental.it
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Image /page/8/Picture/0 description: The image shows the logo for FONA, a company with the tagline "CLOSER TO YOU". The word "FONA" is written in large, bold, gray letters. Above the word "FONA" is a yellow curved line. Below the word "FONA" is the tagline "CLOSER TO YOU" in smaller, gray letters.
Page 6 of 7
ll FONA S.r.l.– Socio Unico - Sede legale, 11 - 2005 Assago (M) Mala - Capitale Sociale Sociale Sociale Sociale Social .V.A.: 1283700159 - Isozione Registo Inpose di Milano REA:1606385 - Telefono: +39 02 45712171 - Fax: +39 02 45703385 - E-mail: info@fonaitaly.com - Web: www.fonadental.it
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Image /page/9/Picture/0 description: The image shows the logo for FONA. The word "FONA" is written in large, gray, sans-serif letters. Above the word is a yellow arc. Below the word "FONA" is the phrase "CLOSER TO YOU" in smaller, gray, sans-serif letters.
The comparison table reveals there are no new technical issues of safety or effectiveness raised by the substitution of the scintillator. Professional evaluation of imaging samples were found to be of good quality, high resolution, clinically acceptable and substantially equivalent to the predicate device.
Summary of Non Clinical Testing: IEC standards have been employed for Electrical Safety, Electromagnetic Compatibility, performance and usability. The panel power supply is UL Listed. The CMOS area image sensor manufacturer conducted performance testing according to the FDA quidance document for solid state digital X-ray panels. Risk Analysis and System operation verification tests were conducted in accordance with FDA guidance documents. Labelling was developed to comply with the FDA solid state panel guidance document.
Summary of Clinical Testing: Sample clinical images from the FONA device were evaluated as per the FDA guidance document for solid state digital X-ray panels and found to be clinically adequate.
Conclusion: After analysing non-clinical data, electrical safety as well as clinical evaluation, it can be concluded that the FONA devices are as safe and effective as the predicate device, has few technological differences, and has no new intended use, thus rendering it substantially equivalent to the predicate device.
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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.
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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.
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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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Reading rule for every project: how many summaries do you read in full?
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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.
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.
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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.
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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.