Intended for use by a qualified/trained doctor or technician on both adult and pediatric subjects for taking diagnostic radiographic exposures of the skull, spinal column, chest, abdomen, extremities, and other body parts. Applications can be performed with the patient sitting, standing, or lying in the prone or supine position. Not for mammography.
Device Story
Mobile X-ray system; generates diagnostic radiographic images of skull, spine, chest, abdomen, extremities. Input: X-ray radiation exposure; output: digital radiographic images. Operated by qualified doctor/technician in clinical settings. System includes high-frequency generator, capacitive discharge technology, wireless flat-panel detector, and touchscreen workstation. Workflow: clinician selects anatomical program; performs exposure; image captured by wireless detector; transmitted to workstation for processing/display. Features include intelligent anode braking, thermal protection, and DICOM 3.0 connectivity for PACS/printing. Provides diagnostic images to assist clinical decision-making; benefits include portability, rapid image preview (2s), and reduced tube wear.
Clinical Evidence
No clinical data. Substantial equivalence established via bench testing of generator/panel combinations and reliance on previously cleared digital X-ray receptor panels. Compliance with IEC 60601 series standards verified.
Indicated for adult and pediatric patients requiring diagnostic radiographic imaging of the skull, spine, chest, abdomen, and extremities. Can be used with patients in sitting, standing, or prone/supine positions. Contraindicated for mammography.
Regulatory Classification
Identification
A mobile x-ray system is a transportable device system intended to be used to generate and control x-ray for diagnostic procedures. This generic type of device may include signal analysis and display equipment, patient and equipment supports, component parts, and accessories.
Predicate Devices
RadPRO® Mobile 40kW; RadPRO® Mobile 40kW FLEXPLUS, Model SM-40HF-B-D-VIR (K161345)
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Image /page/0/Picture/0 description: The image contains the logo of the U.S. Food and Drug Administration (FDA). On the left is the Department of Health and 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.
June 19, 2020
VMI Tecnologias LTDA % Mr Daniel Kamm Principal Engineer Kamm & Associates 8870 Ravello Ct NAPLES FL 34114
Re: K201340
Trade/Device Name: AQUILA 320 D / AQUILA 320 S Regulation Number: 21 CFR 892.1720 Regulation Name: Mobile x-ray system Regulatory Class: Class II Product Code: IZL, MQB Dated: May 15, 2020 Received: May 20, 2020
Dear Mr. Kamm:
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
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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) 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 (OS) 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,
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) K201340
Device Name AQUILA 320 D / AQUILA 320 S
#### Indications for Use (Describe)
Intended for use by a qualified/trained doctor or technician on both adult and pediatric subjects for taking diagnostic radiographic exposures of the skull, spinal column, extremities, and other body parts. Applications can be performed with the patient sitting, standing, or lying in the prone or supine position. Not for mammography.
Type of Use (Select one or both, as applicable)
| <span style="font-size:10px">☑</span> Prescription Use (Part 21 CFR 801 Subpart D) |
|------------------------------------------------------------------------------------|
| <span style="font-size:10px">☐</span> Over-The-Counter Use (21 CFR 801 Subpart C) |
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K201340
510(k) Summary: 510(k) Number K201340 VMI Tecnologias LTDA Rua Prefeito Elizeu Alves Da Silva, 400 -Dist. Ind. Genesco Aparecido De Oliveira, Lagoa Santa, Minas Gerais, Brazil Date Prepared: June 17, 2020 Contact: Otavio Viegas Tel: +55 (31) 3370-3750
- 1) Identification of the Device: Trade/Device Name: AQUILA 320 D / AQUILA 320 S Regulation Number: 21 CFR 892.1720 Regulation Name: Mobile x-ray system Regulatory Class: II Product Codes: IZL, MQB. Common/Usual Name: Digital Mobile Diagnostic X-Ray System
- 2) Equivalent legally marketed device: K161345, Sedecal SA Trade/Device Name: RadPRO® Mobile 40kW; RadPRO® Mobile 40kW FLEXPLUS, Model SM-40HF-B-D-VIR Regulation Number: 21 CFR 892.1720 Regulation Name: Mobile x-ray system Regulatory Class: II Product Codes: IZL, MQB. Common/Usual Name: Digital Mobile Diagnostic X-Ray System
- 3) Reference devices: We employ these cleared devices without modification: Digital Image Detector - DRTECH EVS 4343: K162555 Digital Image Detector - DRTECH EVS 3643: K162555 Digital Image Detector - CareRay model CareView 1500CW: K150929 Digital Image Detector - CareRay model CareView 1800CW: K172581 Digital Image Detector - CareRay model CareView 750CW: K163019 Digital Image Detector - CareRay model CareView 1500C/L: K153058 Digital Image Detector - CareRay model CareView 1800L: K153492 Digital Image Detector - CareRay model CareView 750C: K163019
Regulation Number: 21 CFR 892. 1680 Regulation Name: Stationary x-ray system Regulatory Class: II Product Code: MQB
- 4) Indications for Use: Intended for use by a qualified/trained doctor or technician on both adult and pediatric subjects for taking diagnostic radiographic exposures of the skull, spinal column, chest, abdomen, extremities, and other body parts. Applications can be performed with the patient sitting, standing, or lying in the prone or supine position. Not for mammography.
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- 5) Description of the Device: Aquila 320-D Series: Small, light, easy handling. High Performance, High Power 320 mA, Leading Technology. Capacitive discharge technology, wireless image capture and transmission technology, smartphone image access. Wireless Detector and Workstation on touchscreen notebook or tablet.
High frequency generator with micro-processor controls: Power 35.2 KW (The Aquila 320-S comes without the digital panels and workstation)
- a) Single phase/biphasic power supply
- b) 110/115/127/220/230 VCA-50/60 Hz according to customer request.
- Resonant technology: IGBT's switching c)
- d) Storage System by capacitive Bank, powered by simple 3- pin socket: 2 kVA's
- KV Range: 40 to 125 kV e)
- t) mA range: 20 to 320 mA (Automatic focus selection)
- mAs range: 0.08 to 320 mAs (above 320 but optional) g)
- h) Exposure time: 0.004 to 5 sec.
- Anatomical program of organs: 272 pre-programmed techniques i)
- j) Numerical indication in kHU's of X-ray tube heating on the control panel
- k) Specific commands for preparation and X-ray shooting
- I) Intelligent anode braking by software, preserving the life span of the X-ray tube
- m) Main protections:
- i) Thermal protection of the X-ray emitter Assembly (overheating)
- ii) -Failure in the filament circuit of sub and over current;
- iii) -Failure of the rotary circuit of sub on current;
- iv) -exposure time above allowed;
- v) Overload protection system in X-ray tube
- n) Flat Panel Detectors: (All FDA Cleared)
- Digital Detectors with cesium iodide scintillator (Csl) and amorphous silicon converter (A-SI) (optional: i) amorphous selenium a-Se).
- ii) Active Area: 43x43cm, 35x43cm or 24x30cm.
- iii) Technology: Wireless.
- iv) Charger for two simultaneous batteries.
- Two batteries or more (optional). v)
- vi) Image resolution with matrix: 2048 × 2560 pixels or larger (optional)
- vii) Pixel size: 120 um or larger,
- viii) A/D converter: 14 bits or higher.
- ix) Preview after X-ray shooting in 2 seconds and image formation in 7 seconds
- x) Protective Case for detector (optional).
- o) Workstation:
- Touchscreen Notebook or Tablet Surface i)
- ii) Processor: Core i5 or higher (optional).
- iii) Hard drive SSD: 256 GB capacity or higher (optional).
- iv) RAM: 4 GB or larger (optional).
- Storage Capacity: 15,000 images or larger (optional). v)
- vi) Indication, on the home screen, of the connection status with PACS and Dicom printer.
- vii) Inserting patient data manually, via Worklist server.
- viii) Emergency exams, without the need for patient registration.
- ix) Insertion of linear measurements and angulations.
- Localized zoom application. Full zoom application in the image. x)
- xi) Brightness/contrast application.
- xii) Zoom tools, adjust to window size, mirroring, and
- xiii) brightness/contrast adjustment at the time of printing.
- xiv) Image rotation and inversion, possibility of inserting fixed/edited text.
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- xv) Export of the list of exams performed in EXCEL spreadsheet format.
- xvi) Image mirroring tools in the vertical and horizontal directions.
- xvii) Rotating images of 90 degrees step by step, right and/or left.
- xviii) DICOM 3.0 Complete Package with: print (DICOM print), Storage (sending images in DICOM standard for PACS systems, sending to remote report), Modality worklist (dicom working list).
| Characteristic | Predicate: K161345, Trade/Device Name:<br>RadPRO® Mobile 40kW; RadPRO® Mobile<br>40kW FLEXPLUS, Model SM-40HF-B-D-VIR | AQUILA 320 D / AQUILA 320 S |
|-------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Indications<br>for Use: | Intended for use by a qualified/trained<br>doctor or technician on both adult and<br>pediatric subjects for taking diagnostic<br>radiographic exposures of the skull, spinal<br>column, chest, abdomen, extremities, and<br>other body parts. Applications can be<br>performed with the patient sitting, standing,<br>or lying in the prone or supine position. Not<br>for mammography | SAME |
| Configuration | Mobile System with digital x-ray panel and<br>image acquisition computer | SAME |
| X-ray<br>Generator(s) | kW Rating: 40 kW only.<br>kV range: From 40 kV to 150 kV in 1 kV steps<br>mA range: From 10 mA to 500 mA | kW Rating: 35.2 kW only.<br>kV range: From 40 to 125 kV in 1 kV steps<br>mA range: From 20 to 320 mA<br>Similar ratings, lower power. But same range of<br>exams can be made. See note below. |
| Collimator | Ralco R221 DHHS | Choice of Models<br>Leadmec Collimator – LDM206<br>Ralco Collimator - R104<br>Ralco Collimator - R104/A<br>Ralco Collimator - R108<br>SM Collimator - 38A<br>All collimators meet the US Performance<br>Standard |
| Digital X-ray<br>Panel<br>Supplied | Canon CXDI 401C Wireless (CSI) K133693<br>Pixel size: 125 μm 3320 × 3408 pixels<br>Canon CXDI 701C Wireless (CSI) K131106<br>Pixel size: 125 μm 2800 × 3408 pixels<br>Canon CXDI 801C Wireless (CSI) K131106<br>Pixel size: 125 μm 2800 × 2192 pixels | Wider range of sizes, customer choses a cleared<br>panel from the reference list, above, paragraph<br>number 5.<br>Pixel pitches from 120 to 154μm. |
| Software | Canon control software CXDI-NE | DROC Software for Careray Detectors, (K201058<br>and others)<br>ECONSOLE Software for DRTECH Detectors.<br>K152172 |
| Panel<br>Interface | Ethernet or Wi-Fi wireless | SAME |
| Meets US<br>Performance<br>Standard | YES 21 CFR 1020.30 and 1020.31 | SAME. This device complies with all applicable<br>requirements of 21 CFR 1020.30, and 1020.31 |
| Characteristic | Predicate: K161345, Trade/Device Name:<br>RadPRO® Mobile 40kW; RadPRO® Mobile<br>40kW FLEXPLUS, Model SM-40HF-B-D-VIR | AQUILA 320 D / AQUILA 320 S |
| Power Source | 100 / 110 / 120 /, 127 / 220 / 230 / 240 V~<br>AC and Batteries | 110/115/127/220/230 VCA-50/60 Hz and<br>Batteries SAME |
| Photos | RadPRO® Mobile<br>Image: RadPRO Mobile<br>Arm shown retracted | AQUILA 320 D / AQUILA 320 S<br>Image: AQUILA 320 D / AQUILA 320 S<br>Similar appearance and footprint |
## 6) Substantial Equivalence Chart
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- 7) The technological characteristics, including design, materials, composition, and energy source, are substantially the same, so there are no issues impacting safety and effectiveness. Safety and Effectiveness, comparison to predicate device. The results of bench testing indicate that the new devices are as safe and effective as the predicate devices. Proper system operation is fully verified upon installation. We verified that the modified combination of components worked properly and produced diagnostic quality images as good as our predicate generator/panel combination. Regarding the power level of the generator compared to the predicate: Our maximum power level is 12% lower than the predicate, however the power offered is more than sufficient to perform chest and other demanding imaging. For example, a typical adult chest x-ray can be done at 100-120 kVp at 4-8 mAs, well within the capability of the generator. Thus the proposed device can perform the same range of exams that the predicate can perform. The OEM manufacturer of the predicate device offers 20 and 32 kW versions of the same device.
- 8) Summary of non-clinical testing: Systems covering all generator/panel combinations were assembled and tested and found to be operating properly. Firmware was validated according to the FDA Guidance for the Content of Premarket Submissions for Software Contained in Medical Devices Document issued on: May 11, 2005. Because the system uses Wi-Fi and Ethernet, we observed the recommendations contained in the FDA Guidance Document: Content of Premarket Submissions for Management of Cybersecurity in Medical Devices Guidance for Industry and Food and Drug Administration Staff. In addition, we reviewed the FDA guidance Pediatric Information for X-ray Imaging Device Premarket Notifications Guidance for Industry and Food and Drug Administration Staff and added a supplement to our user manual. We also reviewed and implemented the recommendations of other FDA source material at the Image Gently website (http://www.imagegently.org/) and the resources in FDA's Pediatric X-ray Imaging webpage (http://www.fda.gov/Radiation-
EmittingProducts/RadiationEmittingProductsandProcedures/MedicalImaging/ucm298899.htm)
{7}------------------------------------------------
The digital panel software employed was already reviewed by FDA in the reference submissions list, above. The labeling was reviewed in light of the FDA guidance document: Radio Frequency Wireless Technology in Medical Devices.
Some of the available collimator models offer Class 2 line generator lasers as an optional aid to bucky alignment. All of the lasers meet the US Performance Standard for lasers, and corresponding product reports have been filed. Labeling is in accordance with the US Performance Standard. The predicate device has this laser option as well.
This device complies with all applicable requirements of 21 CFR 1020.30, and 1020.31
The AQUILA 320 D / AQUILA 320 S Mobile X-Ray Units have been tested by 3rd party Nationally Recognized Testing Laboratories to be in compliance with the following International Standards:
IEC 60601-1:2005 + AMD1:2012 Medical electrical equipment - Part 1: General requirements for basic safety and essential performance; (19-4)
IEC 60601-1-2:2010 Medical Electrical Equipment - Part 1-2: General requirements for basic safety and essential performance - Collateral Standard: Electromagnetic Compatibility - Requirements and tests (19-8: 2014)
IEC 60601-1-3:2011 Medical Electrical Equipment - Part 1-3: General requirements for basic safety and essential performance - Collateral Standard: Radiation protection in diagnostic X-ray equipment; (12-269: 2013)
IEC 60601-1-6:2010+AMD1:2013 Medical electrical equipment - Part 1-6: General requirements for basic safety and essential performance - Collateral standard: Usability; (5-89)
IEC 60601-1-9:2014 - Medical electrical equipment - Part 1-9: General requirements for basic safety and essential performance - Collateral Standard: Requirements for environmentally conscious design (NR)
IEC 60601-2-28:2012 Medical electrical equipment - Part 2-28: Particular requirements for the basic safety and essential performance of X-ray tube assemblies for medical diagnosis (12-204)
IEC 60601-2-54:2011 +2016 AM Medical electrical equipment - Part 2- 54: Particular requirements for the basic safety and essential performance of X-ray equipment for radiography and radioscopy; (12-296)
- 9) Summary of clinical testing: Clinical testing was not required to establish substantial equivalence because all digital x-ray receptor panels have had previous FDA clearance.
- 10) Conclusion: After analyzing bench and clinical tests, it is the conclusion of VMI Tecnologias LTDA that the new AQUILA 320 D / AQUILA 320 S Digital Diagnostic Mobile X-Ray Systems are as safe and effective as the predicate device, have few technological differences, and has the same indications for 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.
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.
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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.
4. Device detail page: chat and citations
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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.
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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.
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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.
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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.