This ARIETTA 50 is intended for use by trained personnel (doctor, sonographer, etc.) while in a healthcare facility for the diagnostic ultrasound evaluation of Fetal, Abdominal, Intra-operative (Spec.), Pediatric, Small Organ (Spec.), A Small Organ (Spec.), Adult Cephalic, Trans-rectal, Trans-vaginal, Trans-esoph. (non-Card.), Musculo-skel. (Convent.), Musculo-skel. (Superfic.), Other (Wound), Cardiac Adult, Cardiac Pediatric, Transesophageal (card.), Peripheral vessel, Other (Gynecological), clinical applications.
Device Story
Multi-functional ultrasound diagnostic scanner; utilizes linear, convex, radial, and phased array probes. Inputs: ultrasound echoes reflected from body tissues. Processing: fully digitalized circuits; adaptive filters (HI REZ) modify echo filter characteristics for image clarity. Modes: B-mode, M-mode, PW/CW Doppler, Color Doppler, Power Doppler, and Tissue Doppler Imaging (TDI). Outputs: real-time tomographic images, blood flow information, and 3D/4D renderings displayed on-screen. Used in healthcare facilities by physicians or sonographers for diagnostic evaluation. Healthcare providers interpret images to inform clinical decision-making. Benefits: non-invasive diagnostic visualization of internal structures and hemodynamics.
Clinical Evidence
No clinical data required; substantial equivalence supported by bench testing, including acoustic output, biocompatibility, electromagnetic compatibility, and electrical/mechanical safety testing per recognized standards.
Technological Characteristics
Fully digitalized ultrasound system; supports linear, convex, sector, and trapezoidal scanning. Connectivity: standard ultrasound interface. Safety standards: IEC 60601-1, IEC 60601-2-37, IEC 60601-1-2. Biocompatibility: ISO 10993-1, -5, -10. Features adaptive filters (HI REZ) for image processing. Software version V3.0.
Indications for Use
Indicated for diagnostic ultrasound evaluation of fetal, abdominal, intra-operative, pediatric, small organ, adult cephalic, trans-rectal, trans-vaginal, trans-esophageal, musculoskeletal, wound, cardiac, and peripheral vessel applications in healthcare facilities by trained personnel.
Regulatory Classification
Identification
An ultrasonic pulsed doppler imaging system is a device that combines the features of continuous wave doppler-effect technology with pulsed-echo effect technology and is intended to determine stationary body tissue characteristics, such as depth or location of tissue interfaces or dynamic tissue characteristics such as velocity of blood or tissue motion. This generic type of device may include signal analysis and display equipment, patient and equipment supports, component parts, and accessories.
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FUJIFILM Healthcare Corporation % Dennis Domoracki Senior Regulatory Affairs Specialist FUJIFILM Healthcare Americas Corporation 81 Hartwell Avenue, Suite 300 LEXINGTON MA 02421
### Re: K220295
April 29, 2022
Trade/Device Name: ARIETTA 50 Regulation Number: 21 CFR 892.1550 Regulation Name: Ultrasonic pulsed doppler imaging system Regulatory Class: Class II Product Code: IYN, IYO, ITX Dated: January 27, 2022 Received: February 2, 2022
### Dear Dennis Domoracki:
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 medical devices and radiation-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,
Jessica Lamb, Ph.D. Assistant 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)
K220295
Device Name ARIETTA 50
#### Indications for Use (Describe)
This ARIETTA 50 is intended for use by trained personnel (doctor, sonographer, etc.) while in a healthcare facility for the diagnostic ultrasound evaluation of Fetal, Abdominal, Intra-operative (Spec.), Pediatric, Small Organ (Spec.), A Small Organ (Spec.), Adult Cephalic, Trans-rectal, Trans-vaginal, Trans-esoph. (non-Card.), Musculo-skel. (Convent.), Musculo-skel. (Superfic.), Other (Wound), Cardiac Pediatric, Transesophageal (card.), Peripheral vessel, Other (Gynecological), clinical applications.
The Modes of Operation are B mode, PW mode (Pulsed Wave Doppler), CW mode (Continuous Wave Doppler), Color Doppler , Power Doppler (Color Flow Angiography), TDI (Tissue Doppler Imaging).
| Type of Use (Select one or both, as applicable) | |
|-------------------------------------------------|--|
|-------------------------------------------------|--|
X Prescription Use (Part 21 CFR 801 Subpart D)
Over-The-Counter Use (21 CFR 801 Subpart C)
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Image /page/3/Picture/0 description: The image shows the Fujifilm logo in black with a red accent. The logo is a stylized version of the company's name, with the letters "FUJIFILM" in a bold, sans-serif font. Below the logo is the tagline "Value from Innovation" in a smaller font. The logo is simple and modern, and the red accent adds a touch of color and visual interest.
**Value from Innovation**
# Section 5 510(k) Summary
## Submitter Information
| Submitter: | FUJIFILM Healthcare Corporation<br>2-1, Shintoyofuta,<br>Kashiwa-Shi, Chiba, JP 277-0804 |
|-------------------|------------------------------------------------------------------------------------------|
| Contact: | Dennis Domoracki, Senior Regulatory Affairs Specialist |
| Telephone number: | (330)-425-1313 Ext:2792 |
| E-mail: | dennis.domoracki@fujifilm.com |
| Date: | January 27, 2022 |
# Contact Information (USA)
| Address: | FUJIFILM Healthcare Americas Corporation<br>81 Hartwell Avenue, Suite 300<br>Lexington, MA 02421 USA |
|----------|------------------------------------------------------------------------------------------------------|
|----------|------------------------------------------------------------------------------------------------------|
## Subject Device Name
| Trade/Proprietary Name: | ARIETTA 50 |
|-------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Regulation Number: | 21 CFR 892.1550 |
| Regulation Name: | Diagnostic Ultrasound System and Accessories |
| Product Code | 90-IYN, 21 CFR 892.1550 Ultrasonic Pulsed Doppler Imaging System<br>90-IYO, 21 CFR 892.1560 Ultrasonic Pulsed Echo Imaging System<br>90-ITX, 21 CFR 892.1570 Diagnostic Ultrasonic Transducer |
| Class | II |
| Panel | Radiology |
# Predicate Device Name
| Predicate Device(s): | ARIETTA 50 (K190248) |
|----------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Regulation Number: | 21 CFR 892.1550 |
| Regulation Name: | Diagnostic Ultrasound System and Accessories |
| Product Code | 90-IYN, 21 CFR 892.1550 Ultrasonic Pulsed Doppler Imaging System<br>90-IYO, 21 CFR 892.1560 Ultrasonic Pulsed Echo Imaging System<br>90-ITX, 21 CFR 892.1570 Diagnostic Ultrasonic Transducer |
| Class | II |
| Panel | Radiology |
## Indications for Use
This ARIETTA 50 is intended for use by trained personnel (doctor, sonographer, etc.) while in a healthcare facility for the diagnostic ultrasound evaluation of Fetal, Abdominal, Intra-operative (Spec.), Pediatric, Small Organ (Spec.), A Small Organ (Spec.), Adult Cephalic, Trans-rectal, Trans-vaginal, Trans-esoph. (non-Card.), Musculo-skel. (Convent.), Musculo-skel. (Superfic.), Other (Wound), Cardiac Adult, Cardiac Pediatric, Transesophageal (card.), Peripheral vessel, Other (Gynecological), clinical applications.
The Modes of Operation are B mode, M mode, PW mode (Pulsed Wave Doppler), CW mode (Continuous Wave Doppler), Color Doppler, Power Doppler (Color Flow Angiography), TDI (Tissue Doppler Imaging).
K220295
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Device Description
### Function
The ARIETTA 50 is a multi-functional ultrasound diagnostic scanner in which Doppler, Color Flow Mapping, etc. are provided and all circuits related to image quality are fully digitalized. This device can be utilized with linear, convex, radial and phased array scan type probes for usage with a variety of clinical applications.
The ARIETTA 50 can be used for individual or combined display in the image display model listed below.
- . B mode is a display mode in which the tomographic image is formed with plural ultrasound beams by the methods mentioned above. During the process of creating the tomographic image, adaptive filters (HI REZ) that modify the characteristics of each echo filter are used to produce a clear image.
- M mode is a display mode of ultrasound beams received sequentially and repeatedly on . the screen from the same direction. It indicates these reflected echoes in one direction from the interior of the patient's body's on time-series scale.
- There are two types of D (Doppler) mode: PW Doppler mode and CW Doppler mode. . PW Doppler mode displays bloodstream information consecutively at a sample point that is detected by pulsed Doppler sonography. CW Doppler mode displays bloodstream information continuously in the single-direction ultrasound beam that is detected by the CW Doppler method.
- Color Doppler mode receives ultrasound from the same direction and detects any . changes that occur over time to identify three types of bloodstream information: its direction, its speed, and its inconsistency. The mode then colors that information and displays it as an overlay on B mode or M mode. Color Flow Mode, Power Doppler Mode, High-Resolution Power Doppler (eFlow) Mode can be used with this instrument according to need.
The 4 methods of electronic scanning are as follows.
- . Linear Scanning Method:
By this method, the ultrasound beam from the ultrasound probe is emitted in a straight line (linearly) and draws a tomographic image of the test subject.
- Convex Scanning Method:
By this method, the ultrasound beam from the ultrasound probe is emitted radially and draws a tomographic image of the test subject.
- . Sector Scanning Method:
By this method, the ultrasound beam from the ultrasound probe is emitted in a fan shape (sector) and draws a tomographic image of the test subject.
- Trapezoidal Scanning Method: ●
By this method, the ultrasound beam from the ultrasound probe is emitted radially without regard to the form of the probe head and draws a tomographic image of the patient.
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**Value from Innovation**
### Scientific Concepts
The principle of operation of ultrasound imaging involves generation of an ultrasound wave pulses with an electric signal applied to a transducer, direction of the resulting ultrasound wave into the tissue of the body, and reception and analysis of the echoes reflected back to the same or an adjacent transducer from the various tissues along the path of the ultrasound wave. The ultrasound waves comprising a beam travel in as straight line in homogeneous media. When an ultrasound wave reaches an interface between two media of different impedances, a portion of the beam energy may pass through the boundary (transmission), and a portion may be reflected. The direction of propagation of the transmitted beam is determined by the angle of incidence of the incident beam upon the boundary, and differences (if any) in the speed of sound in the two media. The direction of reflection is determined solely by the angle of incidence upon the boundary. The relative strength of the reflected wave depends upon the differences in the impedances between the two media. Reflection at a boundary between soft tissue and bone, as an example, involves a large impedance difference, and results in a relatively strong reflected echo. Reflection at a boundary between two soft tissue-types with a relatively small impedance difference, on the other hand, results in a relatively weak reflected echo.
### Physical and Performance Characteristics
Analysis confirms the performance characteristics of the ARIETTA 50 are comparable to the predicate device and support our conclusion that the subject system is substantially equivalent.
### Performance Comparison
No new hazards were identified with the ARIETTA 50. The subject device and its transducers have been evaluated for acoustic output, biocompatibility, cleaning & disinfection effectiveness, electromagnetic compatibility, as well as electrical and mechanical safety, and have been found to conform to applicable medical device safety standards.
| Testing Type | Rationale Analysis |
|--------------------------------|---------------------------------------------------------------------------------------------------------|
| Performance Testing - Bench | FUJIFILM Healthcare Corporation judged that ARIETTA 50 is substantially equivalent to<br>the predicate. |
| Performance Testing - Clinical | None required |
The analysis confirms the performance characteristics of the ARIETTA 50 are comparable to the predicate device and support our conclusion that the subject device is substantially equivalent.
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Device Technological Characteristics
The technological characteristics differences between the ARIETTA 50 and the predicate device ARIETTA 50 (K190248) are:
| ● | Physical characteristics of the system | There are no significant differences in appearance, weight, size, hardware, transmit/receive parameters, modes of operation, and features from the predicate device. | |
|---|----------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------|
| | | ARIETTA 50 Subject Device | ARIETTA 50 Predicate Device (K190248) |
| ● | Probes | Probe | Previous Clearance |
| | | C22K | ARIETTA 65 (K202422) |
| | | C22P | ARIETTA 65 (K202422) |
| | | C251 | ARIETTA 65 (K202422) |
| | | C35 | ARIETTA 65 (K202422) |
| | | C41B | ARIETTA 65 (K202422) |
| | | C41L47RP | ARIETTA 65 (K202422) |
| | | C41RP | ARIETTA 65 (K202422) |
| | | C41V | ARIETTA 65 (K202422) |
| | | C42K | ARIETTA 65 (K202422) |
| | | CC41R | ARIETTA 65 (K202422) |
| | | L64 | ARIETTA 65 (K202422) |
| | | S31 | ARIETTA 65 (K202422) |
| | | VC35 | ARIETTA 65 (K202422) |
| | | VC41V | ARIETTA 65 (K202422) |
| ● | New Features | Real-time 3D<br>4Dshading | |
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**Value from Innovation**
# Substantial Equivalence
A summary decision was based on a thorough analysis and comparison of the functions. scientific concepts, physical and performance characteristics, performance comparison and technological characteristics.
#### Probes
The 13 additional probes for the system meet user requirements in regards to indications for use and have no effect on the safety and effectiveness of the device. These probes have been cleared by previous 510(k) submissions of art below.
#### Features
The ARIETTA 50 has 2 additional features (Real-time 3D, 4Dshading). However, these features where cleared in previous 510(k) submissions (ARIETTA 65, K202422). Therefore, FUJIFILM judges that the ARIETTA 50 has no additional issues with safety and effectiveness.
Based on analysis of the above-mentioned comparison. FUJIFILM Healthcare Corporation has judged the subject device to have the equivalent safety and effectiveness of the predicate device.
## Summary of Non-Clinical Testing
The ARIETTA 50 V3.0 system is in conformance with the applicable parts of the following standards:
- AAMI ANSI ES60601-1:2005/(R) 2012 and A1:2012, C1:2009/(R)2012 and ● A2:2010/(R)2012
Medical electrical equipment - Part 1: General requirements for basic safety and essential performance (IEC 60601-1:2005, MOD)
- IEC 60601-2-37 Edition 2.1 2015 .
Medical electrical equipment - part 2-37: particular requirements for the basic safety and essential performance of ultrasonic medical diagnostic and monitoring equipment. (Radiology)
- IEC 60601-1-2 Edition 4.0 2014-02 . Medical electrical equipment - part 1-2: general requirements for basic safety and essential performance - collateral standard: electromagnetic compatibility - requirements and tests. (General II (ES/EMC))
- AAMI I ANSI I ISO 10993-1:2009/(R)2013 ● Biological evaluation of medical devices - part I: evaluation and testing within a risk management process. (Biocompatibility)
- AAMI I ANSI I ISO 10993-5:2009/(R)2014 Biological evaluation of medical devices - part 5: tests for in vitro cytotoxicity. (Biocompatibility)
- AAMI I ANSI I ISO I 0993-10: 2002 + am1 2006 ● Biological evaluation of medical devices - part I 0: tests for irritation and skin sensitization. (Biocompatibility)
# Summary of Clinical Testing
Clinical testing was not required.
## Conclusions
It is the opinion of FUJIFILM Healthcare Corporation, that the ARIETTA 50 Ultrasound Diagnostic scanner and transducers is substantially equivalent to the predicate devices. The subject device software features, intended use, materials, and diagnostic capabilities have been taken from the predicate devices. In addition, we have concluded that the subject device and predicate devices are substantially equivalent with respect to safety, effectiveness, and functionality.
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Part 1 — Search, results, and everyday workflows 16 min
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1. Search: exact and fuzzy
Type a phrase like "coronary artery calcification" into the search box. You get two kinds of results. Exact results match the literal phrase — prefix searches work ("coronary artery calcificati") but suffix searches do not. Fuzzy results match on the meaning and intent of your phrase rather than the exact words, and are sorted by relevance score. Hover over the Exact or Fuzzy badge on any row to see exactly why it matched.
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
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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.
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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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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.