EpiFaith Syringe is intended for use with an epidural needle for detecting a loss of resistance, which aids a clinician in verifying needle tip placement in the epidural space.
Device Story
EpiFaith Syringe is a single-use, spring-loaded piston syringe designed for loss of resistance (LOR) technique during epidural needle placement. Device connects to 16-18 gauge epidural needles via Luer or NRFit connectors. Clinician advances needle while applying pressure to plunger; upon reaching epidural space, pressure drop triggers spring-loaded piston to move forward, providing visual signal of LOR. This visual feedback assists clinician in confirming needle tip location. Device is constructed of polypropylene, natural/synthetic rubber, and stainless steel spring. Used in clinical settings by physicians/clinicians to improve accuracy of epidural space identification and potentially reduce complications associated with needle placement.
Clinical Evidence
Bench testing only. Performance data included visual indicator response time, needle protruding length, visual indicator activation on epidural simulator, O-ring resistance, and human factors/usability testing. Biocompatibility testing performed per ISO 10993-1 (hemolysis, cytotoxicity, sensitization, irritation, systemic toxicity, pyrogenicity).
Technological Characteristics
Piston syringe with spring-loaded mechanism. Materials: Polypropylene, natural/synthetic rubber, stainless steel spring. Connectors: Luer slip (ISO 80369-7) or NRFit (ISO 80369-6). Dimensions: 103.0-134.0mm length, 14.6mm barrel diameter. Sterilization: E.O. gas (SAL 10^-6). Single-use. Mechanical sensing principle.
Indications for Use
Indicated for use by clinicians to assist in verifying needle tip placement in the epidural space during epidural procedures.
Regulatory Classification
Identification
A piston syringe is a device intended for medical purposes that consists of a calibrated hollow barrel and a movable plunger. At one end of the barrel there is a male connector (nozzle) for fitting the female connector (hub) of a hypodermic single lumen needle. The device is used to inject fluids into, or withdraw fluids from, the body.
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## K182268 510(k) Summary
- Submitter 1. Official Contact Name: Shao Wei, Tseng Title: Chief of Regulatory Officer Email: shaowei@flatmedical.com Telephone number: +886-2-25672959 #13 Flat Medical Co., Ltd. Address: Rm. 1, 9F., No. 27, Sec. 1, Chang'an E. Rd., Zhongshan Dist., Taipei City 10441, Taiwan April 4, 2019 Date of Preparation 2. Subject Device EpiFaith Syringe (Luer Slip), EpiFaith Syringe (NRFit) Name of Device: Syringe, Piston Common/Usual Name:
- Class II Device Classification: Piston Syringe Classification Name: 21 CFR 880.5860 Regulation Number Product Code: FMF
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Image /page/0/Picture/4 description: The image contains the logo for Flat Medical. The logo consists of a blue and gray icon to the left of the text "Flat Medical". Below the word "Medical" is the text "Safe care for All" in a smaller font. The icon is a stylized cross shape.
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#### 3. Predicate Devices
| Name of Device: | AutoDetect Syringe |
|------------------------|--------------------|
| Common/Usual Name: | Syringe, Piston |
| Device Classification: | Class II |
| Classification Name: | Piston Syringe |
| Regulation Number | 21 CFR 880.5860 |
| Product Code: | FMF |
| Premarket Notification | K041590 |
#### 4. Device Description and technology Characteristics
The EpiFaith is a loss of resistance syringe with a spring-loaded piston, which can provide a means for detecting entry into the epidural space. Based on the principle of the LOR technique, the piston will simultaneously move forward when the pressure drop occurs due to the spring force. The moving of the piston can provide a visual signal to indicate the LOR as well as assist in verifying the needle tip placement in the epidural space. The EpiFaith syringe is compatible to a 16-18 gauge epidural needle with Luer or NRFit connector. The user can push the plunger to increase the pressure after the syringe is connected to an inserted needle. Then, the user can advance the needle until the visual signal occurs. Because the piston is spring loaded, the automatic ejection of the content of the syringe will happen when the LOR occurs, resulting in the movement of the piston. There are two different models of EpiFaith Syringe. The proposed models are listed in Table 4.1. The only differences between two models are the type of the connector and color.
| Flat Medical EpiFaith Syringe | |
|-------------------------------|----------------|
| Model # | Connector type |
| FM-01SLR | Luer slip |
| FM-02SNR | NRFit |
### Table 4.1: Proposed models of Flat Medical EpiFaith Syringe
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#### 5. Indications for Use
EpiFaith Syringe is intended for use with an epidural needle for detecting a loss of resistance, which aids a clinician in verifying needle tip placement in the epidural space.
| ELEMENT OF<br>COMPARISON | SUBJECT DEVICE | PREDICATE DEVICE |
|--------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------|
| Trade name | EpiFaith Syringe | AutoDetect Syringe |
| 510(k) number | K182268 | K041590 |
| Regulation Number | 21 CFR 880.5860 | 21 CFR 880.5860 |
| Regulation Name | Piston Syringe | Piston Syringe |
| Regulatory Class | II | II |
| Product Code | FMF | FMF |
| Syringe type | Piston Syringe | Piston Syringe |
| Intended use | EpiFaith Syringe is intended for use with an<br>epidural needle for detecting a loss of<br>resistance, which aids a clinician in verifying<br>needle tip placement in the epidural space. | The AutoDetect Syringe is intended for use<br>with an epidural needle for the verification<br>of needle tip placement in the epidural<br>space. |
| Principle of operation | EpiFaith Syringe is based on the principle of<br>LOR, loss of resistance | The AutoDetect Syringe is based on the<br>principle of LOR, loss of resistance |
| Nozzle type | There are two models.<br>Luer slip (follow ISO80369-7)<br>NRFit (follow ISO80369-6) | - |
| Lubricant | Silicone oil | - |
| Reuse durability | Single use only | - |
| Material | Polypropylene | Polypropylene |
| | natural & synthetic rubber | Silicone |
| | The spring is made of stainless steel. | Polycarbonate |
| Biocompatibility | Meets guidelines presented in Use of<br>International Standard ISO 10993-1,<br>"Biological evaluation of medical devices –<br>Part 1: Evaluation and testing within a risk<br>management process. | Meets guidelines presented in ISO 10993-<br>1:2009. |
| Sterilization method | E.O gas sterilization<br>Sterile assurance level : 10-6 | - |
| Dimensions | Length:103.0mm to 134.0mm | - |
| | Outer diameter of barrel:14.6mm | |
| | Weight: 7.0g | |
| | Maximum usable capacity:4ml | |
| Applicable standard | ISO 7886-1<br>ISO 80369-6<br>ISO 80369-7 | ISO 7886-1 |
| Packaging | Single device is contained in an E.O. gas<br>permeable bag as the sterile barrier. The<br>bag is made by Tyvek and PET with<br>200mm*75mm of dimension. Fifty bags are<br>contained in a folding carton<br>(205*175*160mm). | - |
#### Comparison of Technological Characteristics with the Predicate Device 6.
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## Substantial Equivalence
The subject device has the same intended use, technology, operation principle and the technical characteristics with the predicate device. Design Verification activities were performed on subject device and all tests were verified to meet the required acceptance criteria. The verification tests demonstrate that the differences in the device do not affect the intended use of the device. There are no significant differences between subject device and the predicate device(s) that would adversely affect the use of the product. We conclude that subject device is substantially equivalent to the predicate device.
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#### 7. Performance Data:
## Non-Clinical Tests
| | FDA guidance and recognized consensus standards have been<br>established for Piston Syringes under FDA Product Code FMF<br>and 21 CFR 880.5860. A battery of tests was performed based<br>on the requirements of the below recognized consensus<br>standards and guidance, as well as biocompatibility,<br>sterilization, and packaging standards and guidance.<br>Conformity to these standards demonstrates that the proposed<br>EpiFaith Syringe met the standards' established acceptance<br>criteria for the device. | |
|----------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Performance<br>Data | ISO 7886-1:2017, Sterile hypodermic syringes for single<br>use – Part 1: Syringes for manual use ISO 80369-6:2016, Small-bore connectors for liquids and<br>gases in healthcare applications – Part 6: Connectors for<br>neuraxial applications ISO 80369-7: 2016, Small-bore connectors for liquids and<br>gases in healthcare applications - Part 7: Connectors for<br>intravascular or hypodermic applications | |
| | ISO 80369-20: 2015, Small-bore connectors for liquids and<br>gases in healthcare applications – Part 20: Common test<br>methods ISO 10993-1, Biological Evaluation Of Medical Devices -<br>Part 1: Evaluation And Testing Within A Risk Management<br>Process ISO 10993-4, Biological evaluation of medical devices—<br>Part 4: Selection of tests for interactions with blood ISO 10993-5, Biological evaluation of medical devices—<br>Part 5: Tests for in vitro cytotoxicity | |
| Performance<br>Data cont'd | • | ISO 10993-7, Biological evaluation of medical devices—<br>Part 7: Ethylene oxide sterilization residuals |
| | • | ISO 10993-10, Biological evaluation of medical devices—<br>Part 10: Tests for irritation and skin sensitization |
| | • | ISO 10993-11, Biological evaluation of medical devices—<br>Part 11: Tests for systemic toxicity |
| | • | ASTM F1980-16, Standard Guide for Accelerated Aging of<br>Sterile Barrier Systems for Medical Devices |
| | • | ISO 11135, Sterilization of health-care products – Ethylene<br>oxide - Requirements for the development, validation and<br>routine control of a sterilization process for medical devices |
| | • | ASTM F1140, Standard Test Methods for Internal<br>Pressurization Failure Resistance of Unrestrained<br>Packages |
| | • | ASTM F1608-00, Standard Test Method for Microbial<br>Ranking of Porous Packaging Materials (Exposure<br>Chamber Method) |
| | • | ISO 15223-1, Medical devices—Symbols to be used with<br>medical device labels, labelling and information to be<br>supplied—Part 1: General requirements |
| | • | ASTM F756-17, Standard Practice for Assessment of<br>Hemolytic Properties of Materials |
| | • | USP <85>, Bacterial Endotoxins Test |
| | • | USP <151>, Pyrogenicity Test |
| Performance | • | USP <161>, Medical Devices-Bacterial Endotoxin and<br>Pyrogen Tests |
| Data cont'd | ISO 28590, Sampling procedure for inspection by attributes Introduction to the ISO2859 series of standards for sampling for inspection by attributes ASTM F88, Standard Test Method for Seal Strength of Flexible Barrier Materials ASTM F1886, Standard Test Method for Determining Integrity of Seals for Flexible Packaging by Visual Inspection ASTM F1929, Standard Test Method for Detecting Seal Leaks in Porous Medical Packaging by Dye Penetration ISO 11737-2, Sterilization of medical devices. Microbiological methods. Tests of sterility performed in the definition, validation and maintenance of a sterilization process ISO 14971, Medical devices. Application of risk management to medical devices USP <788>, Particulate Matter in Injections | |
| | <b>Performance Bench Testing</b> Visual indicator response time Needle protruding length and visual indicator activation on an epidural simulator Resistance of the O-ring Human Factors and Usability Testing on an epidural simulator The EpiFaith Syringe complies with the FDA recognized consensus standards: ISO 7886-1:2017 | |
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O ISO 80369-6:2016 O ISO 80369-7:2016, as outlined within this submission. Results of the testing demonstrate that the subject device met the acceptance criteria sufficient for its intended use. Biocompatibility testing The biocompatibility evaluation for the EpiFaith Syringe was conducted in accordance with the FDA Guidance Document "Use of International Standard ISO-10993, 'Biological Evaluation of Medical Devices Part 1: Evaluation and Testing within a Risk Management Process, June 16, 2016, and International Standard ISO 10993-1 "Biological Evaluation of Management Process," as recognized by FDA. Testing included the following: ● Hemolysis ● In vitro cytotoxicity ● Skin sensitization ● Intracutaneous irritation O Acute systemic toxicity ● Material-Mediated Pyrogens 0 Limulus amoebocyte lysate endotoxin The EpiFaith Syringe is considered tissue/bone/dentin contacting for a duration of less than 24 hours.
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#### 8. Conclusion
Based on the intended use, materials, design, and performance testing, the EpiFaith Syringe meets the requirements that are considered essential for its intended use and is considered substantially equivalent to the predicate device, the AutoDetect Syringe, K041590.
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Flat Medical Co., Ltd. Shao-Wei Tseng Chief Regulatory Officer Rm. 1, 9F., No.27, Sec.1, Chang' an E. Rd., Zhongshan Dist. Tainei. 10441 Tw
Re: K182268
Trade/Device Name: EpiFaith Syringe (Luer Slip), EpiFaith Syringe (NRFt) Regulation Number: 21 CFR 880.5860 Regulation Name: Piston syringe Regulatory Class: Class II Product Code: FMF Dated: February 27, 2019 Received: March 5, 2019
Dear Shao-Wei Tseng:
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 801); medical device reporting (reporting of medical device-related adverse events) (21 CFR 803) for
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devices or postmarketing safety reporting (21 CFR 4, Subpart B) for combination products (see https://www.fda.gov/CombinationProducts/GuidanceRegulatoryInformation/ucm597488.html; 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, fi 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 http://www.fda.gov/MedicalDevices/Safety/ReportaProblem/default.htm.
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/DeviceRegulationandGuidance/) and CDRH Learn (http://www.fda.gov/Training/CDRHLearn). 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 (http://www.fda.gov/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 Tina Kiang, Ph.D. Acting Director Division of Anesthesiology. General Hospital, Respiratory, Infection Control, and Dental Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
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# 004 Indications For Use
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#### DEPARTMENT OF HEALTH AND HUMAN SERVICES Food and Drug Administration
## Indications for Use
510(k) Number (if known) K182268
Device Name EpiFaith Syringe (Luer Slip) EpiFaith Syringe (NRFit)
Indications for Use (Describe)
EpiFaith Syringe is intended for use with an epidural needle for detecting a loss of resistance, which aids a clinician in verifying needle tip placement in the epidural space.
| Type of Use (Select one or both, as applicable) | <table border="0"><tr><td><table border="0"><tr><td></td><td>Prescription Use (Part 21 CFR 801 Subpart D)</td></tr></table></td><td><table border="0"><tr><td></td><td>Over-The-Counter Use (21 CFR 801 Subpart C)</td></tr></table></td></tr></table> | <table border="0"><tr><td></td><td>Prescription Use (Part 21 CFR 801 Subpart D)</td></tr></table> | | Prescription Use (Part 21 CFR 801 Subpart D) | <table border="0"><tr><td></td><td>Over-The-Counter Use (21 CFR 801 Subpart C)</td></tr></table> | | Over-The-Counter Use (21 CFR 801 Subpart C) |
|---------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------|----------------------------------------------|--------------------------------------------------------------------------------------------------|--|---------------------------------------------|
| <table border="0"><tr><td></td><td>Prescription Use (Part 21 CFR 801 Subpart D)</td></tr></table> | | Prescription Use (Part 21 CFR 801 Subpart D) | <table border="0"><tr><td></td><td>Over-The-Counter Use (21 CFR 801 Subpart C)</td></tr></table> | | Over-The-Counter Use (21 CFR 801 Subpart C) | | |
| | Prescription Use (Part 21 CFR 801 Subpart D) | | | | | | |
| | Over-The-Counter Use (21 CFR 801 Subpart C) | | | | | | |
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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.
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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.
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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.
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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.
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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.
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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.