MATRIX DIGITAL REVERSE OSMOSIS WATER TREATMENT SYSTEM, MODEL EQRMD SERIES
K051620 · Better Water, Inc. · FIP · Nov 18, 2005 · Gastroenterology, Urology
Device Facts
Record ID
K051620
Device Name
MATRIX DIGITAL REVERSE OSMOSIS WATER TREATMENT SYSTEM, MODEL EQRMD SERIES
Applicant
Better Water, Inc.
Product Code
FIP · Gastroenterology, Urology
Decision Date
Nov 18, 2005
Decision
SESE
Submission Type
Abbreviated
Regulation
21 CFR 876.5665
Device Class
Class 2
Indications for Use
The Matrix Series Digital Reverse Osmosis Water Treatment System is an accessory device designed to safely and effectively provide water purification for use in hemodialysis applications. The water produced will meet the minimum water quality requirements as specified by Association for the Advancement of Medical Instrumentation (AAMI) standard RD62:2003 when used as directed. Dependent on feed water quality this unit may be used in conjunction with other approved water treatment components.
Device Story
Matrix Series Digital Reverse Osmosis Water Treatment System; accessory for hemodialysis applications. Inputs: tap water (feed water). Process: reverse osmosis filtration to remove organic/inorganic substances and microbial contaminants; system includes electronic PLC, firmware, and operator interface touch screen for monitoring. Outputs: purified water meeting AAMI RD62:2003 standards. Used in clinical settings; operated by healthcare staff. Features electronic monitoring of feed/product water pressure, flow, conductivity, and membrane performance. Safety features include 100% diversion-to-drain if product conductivity exceeds set-points, plus alarms for low supply pressure, high temperature, and power disturbances. Benefits: ensures water quality for dialysate preparation, reducing patient risk from contaminants.
Clinical Evidence
No clinical data. Substantial equivalence based on non-clinical bench testing and comparison of technological characteristics to predicate devices.
Technological Characteristics
Reverse osmosis water purification system. Components mounted on open frame. Features electronic PLC, firmware, and operator interface touch screen. Monitors pressure, flow, and conductivity. Includes diversion-to-drain safety mechanism. Materials are FDA/NSF compliant. Connectivity includes remote alarm capability for nurse stations.
Indications for Use
Indicated for hemodialysis patients requiring purified water for dialysate preparation. Used in clinical settings to remove organic/inorganic substances and microbial contaminants from tap water.
Regulatory Classification
Identification
A water purification system for hemodialysis is a device that is intended for use with a hemodialysis system and that is intended to remove organic and inorganic substances and microbial contaminants from water used to dilute dialysate concentrate to form dialysate. This generic type of device may include a water softener, sediment filter, carbon filter, and water distillation system.
Special Controls
*Classification.* Class II (special controls). The device, when it is a water purification subsystem disinfectant, is exempt from the premarket notification procedures in subpart E of part 807 of this chapter subject to the limitations in § 876.9.
Predicate Devices
Water Purification System For Hemodialysis (K920186)
Complete Water System Models MD 610, 620, 630 and 640 (K041163)
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NOV 1 8 2005
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## 510(K) SUMMARY 510(K) Number : K051620
1 Date Prepared August 26, 2005
#### 2 Contact Person
Mike Cline President, Better Water, Incorporated 698 Swan Drive Smyrna, TN 37167 615-355-6063
#### 3 Device Name
| Proprietary Name: | Matrix Series Digital Reverse Osmosis<br>Water Treatment System |
|----------------------|--------------------------------------------------------------------------------------------------------------------------------------------------|
| Common Name: | Reverse Osmosis Water Purification<br>System For Hemodialysis with Digital<br>Controls |
| Panel: | Gastroenterology/Urology |
| Classification Name: | Water Purification System For<br>Hemodialysis; Class II; Water<br>purification system for hemodialysis (21<br>CFR 876.5665); Product Code 78 FIP |
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K051620
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#### 4 Device Description
The Matrix Series Digital Reverse Osmosis Water Treatment System is an accessory device that is intended for use with a hemodialysis applications and is intended to remove organic and inorganic substances and microbial contaminants from tap water used to dilute dialysate concentrate to form dialysate. The Matrix Series Digital Reverse Osmosis Water Treatment System will produce water as prescribed by the Association for the Advancement of Medical Instrumentation (AAMI) RD62:2003 standard provided adequate flow rate of the feed (tap) water and compliance with existing drinking water standards and proper pre-treatment.
#### 5 Substantial Equivalence To Predicate Device
The Matrix Series Digital Reverse Osmosis Water Treatment System is based upon the technology of the Water Purification System For Hemodialysis manufacturered by Better Water (K920186) with respect to "wetted-contact materials", pump size and the selection of the type and number of membranes.
Additionally, the Matrix Series features an electronic PLC with firmware as well as an Operator Interface Touch Screen. These electronic features are equivalent to the electronic features incorporated in the MD 400 (K993200) and 600 (K041163) Series Water Systems manufactured by Isopure Incorporated.
See the table below for detailed comparison.
Appendix 5 - Page 2 of 5
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# Table of Comparison To Predicate Devices
| | | Predicate Devices | | | |
|-------------------------------|-------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------|--|
| Specifications | Matrix Current 510(K) | Water Purification System<br>For Hemodialysis | Complete Water System<br>Models MD 610, 620, 630<br>and 640 | Multi-Patient Reverse<br>Osmosis - Models MD 420,<br>440, 460, 470, 480 and 490 | |
| Manufacturer | Better Water, Inc | Better Water, Inc | Isopure Corporation | Isopure Corporation | |
| 510(K)<br>Number | - | K920186 | K041163 | K993200 | |
| Decision Date | - | 6/13/1995 | 10/7/2004 | 1/24/2000 | |
| Classification | 876.5665, Class II | 876.5665, Class II | 876.5665, Class II | 876.5665, Class II | |
| Product Code | FIP | FIP | FIP | 78 FIP | |
| Water-Contact<br>Materials | FDA - NSFCompliant | FDA - NSFCompliant | FDA - NSFCompliant | FDA - NSFCompliant | |
| Pre-Treatment<br>Options | Based upon site-specific feed water<br>chemical analysis. | Based upon site-specific<br>feed water chemical<br>analysis. | Based upon site-specific<br>feed water chemical<br>analysis. | Based upon site-specific<br>feed water chemical<br>analysis. | |
| | Feed water Pre-Treatment may<br>include | Feed water Pre-Treatment<br>may include : | Feed water Pre-Treatment<br>may include : | Feed water Pre-Treatment<br>may include : | |
| | · Carbon Filtration | · Carbon Filtration | · Carbon Filtration | · Carbon Filtration | |
| | · Softners | · Softners | · Softners | · Softners | |
| | · Temperature Control | · Temperature Control | · Temperature Control | · Temperature Control | |
| | · Pressure Compensation | · Pressure Compensation | · Pressure Compensation | · Pressure Compensation | |
| | · Special Filtration | · Special Filtration | · Special Filtration | · Special Filtration | |
| | · Ultra-Violet (UV) | · Ultra-Violet (UV) | NA | NA | |
| | · Ozone | NA | NA | NA | |
| Operational<br>Features | Electronic touch screen interface | Manual Controls | Electronic touch screen<br>interface | Electronic touch screen<br>interface | |
| | All components mounted on an<br>open frame for assessibility | All components mounted<br>on an open frame for<br>assessibility | All components mounted<br>on an open frame for<br>assessibility | All components mounted on<br>an open frame for<br>assessibility | |
| | Electronic Monitoring of | Analog Monitoring of | Electronic Pressure<br>Monitoring of | Electronic Pressure<br>Monitoring of | |
| | · Feed water pressure / flow | · Feed water pressure | · Feed water pressure | · Feed water pressure | |
| | · Product water pressure/ flow | · Product water pressure | · Product water pressure | · Product water pressure | |
| | · Membrane feed pressure | · Membrane feed pressure | · Membrane feed pressure | · Membrane feed pressure | |
| | · Pump Pressure | · Pump Pressure | · Pump Pressure | · Pump Pressure | |
| | · Reject Water Pressure/Flow | · Reject Water<br>Pressure/Flow | · Reject Water<br>Pressure/Flow | · Reject Water<br>Pressure/Flow | |
| | · Product Water Conductivity | · Product Water<br>Conductivity | · Product Water<br>Conductivity | · Product Water<br>Conductivity | |
| | · Feed water Conductivity | · Feed water Conductivity | · Feed water Conductivity | · Feed water Conductivity | |
| | · System Flush | · Manual | · System Flush | · System Flush | |
| | · Clean/Disinfect Flow Rate | · NA | · Semi-Automated | · Semi-Automated | |
| | Manual or Automated<br>System cleaning and<br>sanitizing by: | | Manual or Automated<br>System cleaning and<br>sanitizing by: | Manual or Automated<br>System cleaning and<br>sanitizing by: | |
| Cleaning | • chemicals agents | Not Applicable | • chemical agents | • chemical agents | |
| Safety<br>Features | 100% diversion-to-drain<br>above product<br>conductivity set-point | 100% diversion-to-drain<br>above product conductivity<br>set-point | 100% diversion-to-drain<br>above product<br>conductivity set-point | Not Applicable | |
| | Low Supply (Feedwater)<br>Pressure (Alarm) | Low Supply (Feedwater)<br>Pressure (Alarm) | Low Supply (Feedwater)<br>Pressure (Alarm) | Low Supply (Feedwater)<br>Pressure (Alarm) | |
| | High Product Water<br>Conductivity (alarm) | High Product Water<br>Conductivity (shut down) | High Product Water<br>Conductivity (shut down) | High Product Water<br>Conductivity (shut<br>down) | |
| | High supply water<br>temperature (shut<br>down) | High supply water<br>temperature (shut down) | High supply water<br>temperature (shut down) | High supply water<br>temperature (shut<br>down) | |
| | High product water<br>conductivity alarm | High product water<br>conductivity alarm | High product water<br>conductivity alarm | High product water<br>conductivity alarm | |
| | System Recovery<br>Notification | Not Applicable | System Recovery<br>Notification | System Recovery<br>Notification | |
| | Power Disturbance<br>(Alarm) | Power Disturbance (Alarm) | Power Disturbance<br>(Alarm) | Power Disturbance<br>(Alarm) | |
| Post-<br>Treatment<br>Options | Remote Alarm (Nurse's<br>Station)<br>May include 0.5 micron<br>or better ultra-filtration | Remote Alarm (Nurse's<br>Station)<br>May include 0.5 micron or<br>better ultra-filtration | Remote Alarm (Nurse's<br>Station)<br>May include 0.5 micron<br>or better ultra-fitration | Remote Alarm (Nurse's<br>Station)<br>May include 0.5 micron<br>or better ultra-filtration | |
| Performance | Delivery of AAMI<br>Standard Water | Delivery of AAMI Standard<br>Water | Delivery of AAMI<br>Standard Water | Delivery of AAMI<br>Standard Water | |
:
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12051620
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# Table of Comparison To Predicate Devices cont'
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#### Indications For Use 6
The Matrix Series Digital Reverse Osmosis Water Treatment System is an accessory device designed to safely and effectively provide water purification for use in hemodialysis applications. The water produced will meet the minimum water quality requirements as specified by Association for the Advancement of Medical Instrumentation (AAMI) standard RD62:2003 when used as directed. Dependent on feed water quality this unit may be used in conjunction with other approved water treatment components.
#### Safety and Effectiveness 7
The intended use and technological characteristics of the Matrix Series Digital Reverse Osmosis Water Treatment System are similar or equivalent to the Predicate Devices. Any difference between the device and the Predicate Devices have no significant influence on the safety or effectiveness of the product.
#### Clinical Performance Data 8
Not required for determination of substantial equivalence for this type and class of device.
### Conclusion Drawn From Clinical and 9 Nonclinical Test Data
As compared with the predicate devices, K920186, K993200 and K041163, the Matrix Series Digital Reverse Osmosis Water Treatment System will produce purified water that will meet the minimum water quality requirements as specified by Association for the Advancement of Medical Instrumentation (AAMI) standard RD62:2003 when used as directed.
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Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850
NOV 1 8 2005
Mr. Michael Cline President Better Water, Inc. 698 Swan Drive SMYRNA TN 37167
Re: K051620
> Trade/Device Name: Matrix Digital Reverse Osmosis Water Treatment System -EQRMD Series Regulation Number: 21 CFR \$876.5665 Regulation Name: Water purification system for hemodialysis Regulatory Class: II Product Code: FIP Dated: November 16, 2005 Received: November 17, 2005
### Dear Mr. Cline:
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.
If your device is classified (see above) into either class II (Special Controls) or class III (Premarket Approval), it may be subject to such 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); good manufacturing practice requirements as set 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.
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This letter will allow you to begin marketing your device as described in your Section 510(k) premarket notification. The FDA finding of substantial equivalence of your device to a legally marketed predicate device results in a classification for your device and thus, permits your device to proceed to the market.
If you desire specific advice for your device on our labeling regulation (21 CFR Part 801), please contact the Office of Compliance at one of the following numbers, based on the regulation number at the top of this letter:
| 21 CFR 876.xxxx | (Gastroenterology/Renal/Urology) | 240-276-0115 |
|-----------------|----------------------------------|--------------|
| 21 CFR 884.xxxx | (Obstetrics/Gynecology) | 240-276-0115 |
| 21 CFR 892.xxxx | (Radiology) | 240-276-0120 |
| Other | | 240-276-0100 |
Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR 807.97). 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) 443-6597 or at its Internet address http://www.fda.gov/cdrh/industry/support/index.html.
Sincerely yours,
Nancy C. Brogdon
Nancy C. Brogdon Director, Division of Reproductive, Abdominal, and Radiological Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
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## Indications For Use Statement
K051620 510(K) Number :
Device Name :
Matrix Series Digital Reverse Osmosis Water Treatment System
Indications For Use:
The Matrix Series Digital Reverse Osmosis Water Treatment System is an accessory device designed to safely and effectively provide water purification for use in hemodialysis applications. The water produced will meet the minimum water quality requirements as specified by Association for the Advancement of Medical Instrumentation (AAMI) standard RD62:2003 when used as directed. Dependent on feed water quality this unit may be used in conjunction with other approved water treatment components.
### PLEASE DO NOT WRITE BELOW THIS LINE - CONTINUE ON ANOTHER PAGE IF NEEDED
## Concurrence of CDRH, Office of Device Evaluation (ODE)
(Division Sign-Off)
Title
Date
### 510(K) Number : K051620
Appendix 3 - Page 1 of 1
ﺃﺷﻬﺮ ﺍﻟﻤﺴﺎﺣﺔ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ Prescription Use
OR Over-The-Counter Use
(Part 21 CFR 801 Subpart D)
(21 CFR 801 Subpart C)
David le. Lymon
(Division Sign-Off)
Division of Reproductive, Abdomina and Radiological Dev 510(k) Number
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.