This guide wire is intended to be used in the neuro vasculature to facilitate the placement and exchange of therapeutic devices such as cerebral catheters during intravascular therapy. This guide wire is intended for use only in the neuro vasculature.
Device Story
CHIKAI Nexus 014 is a neurovascular guide wire consisting of a stainless-steel tapered core wire with inner and outer coils of radiopaque Pt-Ni alloy and stainless-steel. The device is used by physicians in clinical settings to navigate cerebral catheters through the neurovasculature under X-ray fluoroscopy. The radiopaque distal tip provides visualization; the device is manipulated using an included torque device and inserter. By facilitating catheter placement, the wire enables intravascular therapy. The device is provided sterile and is intended for single use.
Clinical Evidence
No clinical data. Substantial equivalence is supported by non-clinical bench testing, including dimensional verification, simulated use, tensile/torque strength, torqueability, coating integrity, lubricity, corrosion resistance, kink resistance, tip flexibility, and radiopacity. Biocompatibility was validated per ISO 10993 standards (cytotoxicity, sensitization, irritation, systemic toxicity, pyrogenicity, and hemocompatibility).
Technological Characteristics
Nominal diameter 0.36mm (0.014 inch); lengths 215cm/300cm. Materials: Austenitic stainless-steel core, Pt-Ni alloy/stainless-steel coils, Ag-Sn solder. Coatings: hydrophilic, polyurethane, PTFE, silicone. Sterilization: Ethylene oxide (EO) to SAL 10^-6. Mechanical features: straight, pre-shape, or angled distal tips. No software or electronic components.
Indications for Use
Indicated for use in the neuro vasculature to facilitate the placement and exchange of therapeutic devices, such as cerebral catheters, during intravascular therapy.
Regulatory Classification
Identification
A catheter guide wire is a coiled wire that is designed to fit inside a percutaneous catheter for the purpose of directing the catheter through a blood vessel.
Special Controls
*Classification.* Class II (special controls). The device, when it is a torque device that is manually operated, non-patient contacting, and intended to manipulate non-cerebral vascular guide wires, is exempt from the premarket notification procedures in subpart E of part 807 of this chapter subject to the limitations in § 870.9.
Predicate Devices
ASAHIN Neurovascular Guide Wire CHIKAI black (K141751)
ASAHIN Neurovascular Guide Wire CHIKAI X 014 soft (K191714)
Submission Summary (Full Text)
{0}
FDA U.S. FOOD & DRUG ADMINISTRATION
April 21, 2025
ASAHI INTECC CO., LTD.
% Cynthia Valenzuela
Director, Regulatory Affairs
ASAHI INTECC USA, INC.
3002 Dow Avenue, Suite 212
Tustin, California 92780
Re: K243383
Trade/Device Name: CHIKAI Nexus 014
Regulation Number: 21 CFR 870.1330
Regulation Name: Catheter Guide Wire
Regulatory Class: Class II
Product Code: MOF
Dated: March 19, 2025
Received: March 19, 2025
Dear Cynthia Valenzuela:
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 (the 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 available 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.
U.S. Food & Drug Administration
10903 New Hampshire Avenue
Silver Spring, MD 20993
www.fda.gov
{1}
K243383 - Cynthia Valenzuela
Page 2
Additional information about changes that may require a new premarket notification are provided in the FDA guidance documents entitled "Deciding When to Submit a 510(k) for a Change to an Existing Device" (https://www.fda.gov/media/99812/download) and "Deciding When to Submit a 510(k) for a Software Change to an Existing Device" (https://www.fda.gov/media/99785/download).
Your device is also subject to, among other requirements, the Quality System (QS) regulation (21 CFR Part 820), which includes, but is not limited to, 21 CFR 820.30, Design controls; 21 CFR 820.90, Nonconforming product; and 21 CFR 820.100, Corrective and preventive action. Please note that regardless of whether a change requires premarket review, the QS regulation requires device manufacturers to review and approve changes to device design and production (21 CFR 820.30 and 21 CFR 820.70) and document changes and approvals in the device master record (21 CFR 820.181).
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 Part 803) for devices or postmarketing safety reporting (21 CFR Part 4, Subpart B) for combination products (see https://www.fda.gov/combination-products/guidance-regulatory-information/postmarketing-safety-reporting-combination-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 Part 4, Subpart A) for combination products; and, if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR Parts 1000-1050.
All medical devices, including Class I and unclassified devices and combination product device constituent parts are required to be in compliance with the final Unique Device Identification System rule ("UDI Rule"). The UDI Rule requires, among other things, that a device bear a unique device identifier (UDI) on its label and package (21 CFR 801.20(a)) unless an exception or alternative applies (21 CFR 801.20(b)) and that the dates on the device label be formatted in accordance with 21 CFR 801.18. The UDI Rule (21 CFR 830.300(a) and 830.320(b)) also requires that certain information be submitted to the Global Unique Device Identification Database (GUDID) (21 CFR Part 830 Subpart E). For additional information on these requirements, please see the UDI System webpage at https://www.fda.gov/medical-devices/device-advice-comprehensive-regulatory-assistance/unique-device-identification-system-udi-system.
Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR 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-devices/medical-device-safety/medical-device-reporting-mdr-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/medical-devices/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-devices/device-advice-comprehensive-regulatory-
{2}
K243383 - Cynthia Valenzuela
Page 3
assistance/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,
Naira Muradyan -S
Naira Muradyan, Ph.D.
Assistant Director
DHT5A: Division of Neurosurgical,
Neurointerventional, and
Neurodiagnostic Devices
OHT5: Office of Neurological and
Physical Medicine Devices
Office of Product Evaluation and Quality
Center for Devices and Radiological Health
Enclosure
{3}
FORM FDA 3881 (8/23)
Page 1 of 1
PSC Publishing Services (301) 443-6740
EF
| DEPARTMENT OF HEALTH AND HUMAN SERVICES Food and Drug Administration Indications for Use | Form Approved: OMB No. 0910-0120 Expiration Date: 07/31/2026 See PRA Statement below. |
| --- | --- |
| 510(k) Number (if known) K243383 | |
| Device Name CHIKAI Nexus 014 | |
| Indications for Use (Describe) This guide wire is intended to be used in the neuro vasculature to facilitate the placement and exchange of therapeutic devices such as cerebral catheters during intravascular therapy. This guide wire is intended for use only in the neuro vasculature. | |
| Type of Use (Select one or both, as applicable) ☑ Prescription Use (Part 21 CFR 801 Subpart D) ☐ Over-The-Counter Use (21 CFR 801 Subpart C) | |
| CONTINUE ON A SEPARATE PAGE IF NEEDED. | |
| This section applies only to requirements of the Paperwork Reduction Act of 1995. *DO NOT SEND YOUR COMPLETED FORM TO THE PRA STAFF EMAIL ADDRESS BELOW.* | |
| The burden time for this collection of information is estimated to average 79 hours per response, including the time to review instructions, search existing data sources, gather and maintain the data needed and complete and review the collection of information. Send comments regarding this burden estimate or any other aspect of this information collection, including suggestions for reducing this burden, to: Department of Health and Human Services Food and Drug Administration Office of Chief Information Officer Paperwork Reduction Act (PRA) Staff PRAStaff@fda.hhs.gov | |
| "An agency may not conduct or sponsor, and a person is not required to respond to, a collection of information unless it displays a currently valid OMB number." | |
{4}
K243383 CHIKAI Nexus 014
# 510(k) Summary
[As required by 21 CFR § 807.92(c)]
# ASAHINTECC CO.,LTD.
Global Headquarters and R&D Center
3-100 Akatsuki-cho, Seto-shi, Aichi 489-0071 Japan
TEL: +81-561-48-5551 FAX: +81-561-48-5552
http://www.asahi-intecc.co.jp/
CHIKAI Nexus 014
510(k) K243383
| DATE PREPARED: | 14th April 2025 |
| --- | --- |
| APPLICANT: | ASAHINTECC CO., LTD. 3-100 Akatsuki-cho, Seto Aichi 489-0071, Japan |
| PRIMARY CONTACT: | Mrs. Cynthia Valenzuela Director, Regulatory Affairs ASAHINTECC USA, INC. 3002 Dow Avenue, Suite 212 Tustin, California 92780 Phone: (714) 442 0575 Email: cynthiav@asahi-intecc-us.com |
| ALTERNATE CONTACT: | Mr. Katsuhiko Fujimura Group Manager, Regulatory Affairs ASAHINTECC CO., LTD. 3-100 Akatsuki-cho Seto, Aichi, Japan 489-0071 Email: katsuhiko.fujimura@asahi-intecc.com |
| TRADE NAME: | CHIKAI Nexus 014 |
| DEVICE CLASSIFICATION: | Class II, 21 CFR § 870.1330 |
| CLASSIFICATION NAME: | Neurovascular Catheter Guide Wire |
| PRODUCT CODE: | MOF |
| PREDICATE DEVICE(S): | ASAHIN Neurovascular Guide Wire CHIKAI black (K141751) |
| REFERENCE DEVICE(S): | ASAHIN PTCA Guide Wire Soft (K022762, K163426) ASAHIN Neurovascular Guide Wire CHIKAI Round Curve (K160659) ASAHIN Neurovascular Guide Wire CHIKAI X 014 soft (K191714) |
# Intended Use/Indications for Use
This guide wire is intended to be used in the neuro vasculature to facilitate the placement and exchange of therapeutic devices such as cerebral catheters during intravascular therapy. This guide wire is intended for use only in the neuro vasculature.
Page 1 of 8
{5}
K243383 CHIKAI Nexus 014
# Device Description
The CHIKAI Nexus 014 consists of a stainless-steel tapered core wire, with an inner coil and outer coil made of radiopaque Pt-Ni alloy and stainless-steel. Surrounding the inner coil and the distal core wire is a radiopaque Pt-Ni alloy and stainless-steel outer coil. The radiopaque distal tip enables the user to view the position of the tip under X-ray fluoroscopy. Outer and inner coils are soldered to the tapered core wire with Ag-Sn solder. A similar coil design is used with other ASAHI guide wires, such as the predicate CHIKAI black (K141751).
Additionally, the CHIKAI Nexus 014 employs hydrophilic, polyurethane, PTFE, and silicone coatings which are used in the predicate and reference devices.
The nominal outer diameter of the CHIKAI Nexus 014 is $0.36\mathrm{mm}$ (0.014 inch). The device is available in two lengths: 215 cm and 300 cm.
Both sizes are available with straight, pre-shape, and angled designs.
# Accessories
CHIKAI Nexus 014 is packaged with a shaping device, torque device, and inserter.
The shaping device can be used to facilitate shaping the distal end of the guide wire.
The torque device can be attached to the proximal end of the guide wire and used to facilitate the rotation of the guide wire during clinical use.
The inserter device can be used to assist the insertion of guide wire into the catheter.
# Comparison with Predicate and Reference Devices
The subject, predicate, and reference devices:
- Have the same or similar intended use and indications for use
- Use the same operating principle
- Incorporate the same basic design
- Incorporate the same materials
The following technological differences exist between the subject and the predicate or the reference devices:
- Different inner coil structure
- Different lineup of usable length
- Different coating length
Page 2 of 8
{6}
K243383 CHIKAI Nexus 014
| Device name | CHIKAI Nexus 014 | CHIKAI black | PTCA Guide Wire Soft | CHIKAI Round Curve | CHIKAI X 014 soft |
| --- | --- | --- | --- | --- | --- |
| | Subject | Predicate | Reference | | |
| 510(k) | K243383 | K141751 | K022762K163426 | K160659 | K191714 |
| Manufacturer | ASAHI INTECC | | | | |
| Regulation Number | 21 CFR 870.1330 | | | | |
| Regulation Name | Catheter Guide Wire | | | | |
| Regulatory Class | II | | | | |
| Product code | MOF | MOF | DQX | MOF | MOF |
| Indications for Use | This guide wire is intended to be used in the neuro vasculature to facilitate the placement and exchange of therapeutic devices such as cerebral catheters during intravascular therapy. This guide wire is intended for use only in the neuro vasculature. | This guide wire is intended to be used in the neuro vasculature to facilitate the placement and exchange of therapeutic devices such as cerebral catheters during intravascular therapy. This guide wire is intended for use only in the neuro vasculature. | ASAHI PTCA Guide Wires are intended to facilitate the placement of balloon dilation catheters during percutaneous transluminal coronary angioplasty (PTCA) and percutaneous transluminal angioplasty (PTA). The ASAHI PTCA Guide Wires are not to be used in the neurovasculature. | ASAHI CHIKAI Neurovascular Guide Wire is intended to be used in the neuro vasculature to facilitate the placement and exchange of therapeutic devices such as cerebral catheters during intravascular therapy. This guide wire is intended for use only in the neuro vasculature. | The guide wire is intended to be used in the neuro vasculature to facilitate the placement and exchange of therapeutic devices such as cerebral catheters during intravascular therapy. This guide wire is intended for use only in the neuro vasculature. |
Page 3 of 8
{7}
K243383 CHIKAI Nexus 014
| | CHIKAI Nexus 014 | CHIKAI black | PTCA Guide Wire Soft | CHIKAI Round Curve | CHIKAI X 014 soft |
| --- | --- | --- | --- | --- | --- |
| Nominal Outer Diameter | 0.36 mm (0.014 inch) | 0.36 mm (0.014 inch) | 0.36 mm (0.014 inch) | 0.36 mm (0.014 inch) | 0.36 mm (0.014 inch) |
| Overall Length | 215 cm, 300 cm | 200 cm, 300 cm | 180 cm, 300 cm | 200 cm, 300 cm | 200 cm |
| Outer Coil | Austenitic stainless-steel Pt-Ni alloy | Austenitic stainless-steel Pt-Ni alloy | Austenitic stainless-steel Pt-Ni alloy | Austenitic stainless-steel Pt-Ni alloy | Austenitic stainless-steel |
| Tapered Core Wire | Austenitic stainless-steel | Austenitic stainless-steel | Austenitic stainless-steel | Austenitic stainless-steel | Austenitic stainless-steel |
| Inner Coil | Austenitic stainless-steel Pt-Ni alloy | Austenitic stainless-steel | N/A | Austenitic stainless-steel | Pt-Ni alloy |
| Tip Shape | Straight, Pre-shape, Angled | Round Curve, Angled | Straight | Round Curve, | Straight |
| Coating | Hydrophilic Silicone Polyurethane PTFE | Hydrophilic Polyurethane PTFE* *applicable to 300 cm model only | Silicone PTFE | Hydrophilic PTFE* *applicable to 300 cm model only | Hydrophilic Silicone |
| Solder | Ag-Sn | Ag-Sn | Ag-Sn | Ag-Sn | Ag-Sn |
| Sterilization | Ethylene oxide (EO) Sterility assurance level (SAL) 10-6 | EO SAL 10-6 | EO SAL 10-6 | EO SAL 10-6 | EO SAL 10-6 |
| Shelf Life | 6 months | 3 years | 3 years | 3 years | 3 years |
Page 4 of 8
{8}
K243383 CHIKAI Nexus 014
# Sterility and Shelf Life
The following tests were conducted to validate the sterility and shelf life of the subject device.
| Test | Test Method Summary | Results |
| --- | --- | --- |
| Sterilization Validation | 100% EO is used to sterilize the device to achieve a SAL of at least 10-6. The device was adopted into an EO sterilization processing group in accordance with AAMI TIR28:2016. Validation of the EO sterilization cycle was performed using the half-cycle, overkill approach described in ISO 11135:2014. | Results of evaluation by AAMI TIR28 justified adoption of the CHIKAI Nexus 014 into the EO sterilization processing group.Additional testing was conducted to validate and ensure sterilization. |
| EO and ECH Residuals | Measured EO and ethylene chlorohydrin (ECH) residuals per AAMI/ANSI/ISO 10993-7:2008. | The residual traces of EO and ECH remaining in the CHIKAI Nexus 014 after exposure to the EO sterilization process met the appropriate criteria with sufficient aeration time. |
| Bacterial Endotoxin Levels | Limulus amebocyte lysate (LAL) testing was conducted in accordance with ANSI/AAMI ST72:2011/(R) 2016, USP <161>, and USP <85>, using the kinetic chromogenic method. | The CHIKAI Nexus 014 met the acceptance criteria of <2.15 endotoxin units (EU) / device. |
| Shelf-Life | Device performance attributes that can be affected by aging and storage conditions were evaluated after exposure to accelerated aging conditions per ASTM F1980.Package integrity of the CHIKAI Nexus 014 was validated by leveraging the results of previously cleared ASAHI INTECC's guide wires which were tested according to ISO 11607-1. | After exposure to accelerated aging conditions simulating real-time storage under ambient conditions for 6 months, all device performance acceptance criteria were met and evaluation of packaging integrity satisfied the criteria, justifying labeling the devices, with a 6-month shelf life. |
{9}
K243383 CHIKAI Nexus 014
# Non-Clinical Testing / Performance Data
The substantial equivalence of the CHIKAI Nexus 014 was evaluated in bench testing that followed the recommendations in the FDA guidance document, "Coronary, Peripheral, and Neurovascular Guidewires - Performance Tests and Recommended Labeling," October 2019.
| Test | Test Method Summary | Results/Conclusion |
| --- | --- | --- |
| Dimensional Verification | The overall length, outer diameters (coil and shaft), and coating lengths of the guidewire are measured. | All samples met the acceptance criteria. |
| Simulated Use | To simulate clinical use, the test is performed in a clinically relevant model in accordance with the procedure in the Instructions for Use. The guidewire is advanced through the model to the target location, and its performance is evaluated during navigation and removal. | All samples met the acceptance criteria. |
| Visual Inspection | Test samples are visually inspected for foreign matter, damage, droplet like residue of coating liquid. | All samples met the acceptance criteria. |
| Tensile Strength | To determine the tensile strength of the guidewire, the guidewire is fixed in the tensile testing machine and pulled until failure. | All samples met the acceptance criteria. |
| Torque Strength | To determine the torque strength of the guidewire, distal end is inserted and advanced through simulated model. Distal tip is held stationary while proximal end is rotated until failure. | All samples met the acceptance criteria. |
| Torqueability | To determine torque response, guidewire is inserted through catheter and into rotational response model. Proximal end is rotated and torque response at distal end is measured. | All samples met the acceptance criteria. |
| Coating Integrity | To evaluate the coating adhesion and coating integrity of the guidewire, the guidewire surface is visually inspected before and after winding the guidewire around a clinically relevant-sized test jig. | All samples met the acceptance criteria. |
| Coating Integrity/ Particulate Evaluation | Coating integrity and particulate generation during simulated use in a glass vascular model are evaluated. Testing follows GLP conditions and relevant FDA guidance. | The results were comparable to the predicate device. |
| Lubricity | Lubricity and catheter compatibility is evaluated by measuring slipping resistance of the guidewire against the catheter. | All samples met the acceptance criteria. |
{10}
K243383 CHIKAI Nexus 014
| Corrosion Resistance | The samples are visually inspected for any sign of corrosion after immersing into aqueous solution of sodium chloride. | All samples met the acceptance criteria. |
| --- | --- | --- |
| Kink Resistance | The guidewire kink resistance is evaluated by performing multiple bends of clinically relevant radii followed by microscopic inspection for any damage. | All samples met the acceptance criteria. |
| Tip Flexibility | To determine the tip flexibility of the guidewire, bending loads of the distal end at various points are measured by applying force at a controlled speed. | All samples met the acceptance criteria. |
| Radiopacity | The visibility of the distal end of the guidewire is evaluated under fluoroscopy. | All samples met the acceptance criteria. |
The in vitro bench tests demonstrated that the CHIKAI Nexus 014 met all acceptance criteria and performed similarly to the predicate device. Performance data demonstrate that the device functions as intended and has a safety and effectiveness profile that is similar to the predicate device.
# BIOCOMPATIBILITY
The biocompatibility of CHIKAI Nexus 014 was evaluated in accordance with ISO 10993 series of standards:
| Test | Test Method Summary | Results/Conclusion |
| --- | --- | --- |
| Cytotoxicity ISO 10993-5 MEM Elution Test | Determine the potential cytotoxicity of a mammalian cell culture (L929) in response to the test article extract. | Non-cytotoxic |
| Sensitization ISO 10993-10 Kligman Maximization Test | Allergenic or sensitizing potential of the device was evaluated using polar and non-polar extracts in a guinea pig maximization test. | Negative for sensitization |
| Irritation ISO 10993-23 Intracutaneous Injection Test | Potential irritation effect of the extract of the device as a result of intracutaneous injection of polar and non-polar extracts was tested. | Non-irritating; Sites injected with the extracts of the subject device did not show a significantly greater biological reaction than the sites injected with control article (predicate device). |
| Systemic Toxicity ISO 10993-11 Acute Systemic Injection Test | Determine the potential toxic effects of the test article extract as a result of a single-dose systemic injection of polar and non-polar extracts in mice. | Non-toxic |
| Systemic Toxicity ISO 10993-11 USP <151> Rabbit Pyrogen Test (Material Mediated) | Determine the potential presence of material-mediated pyrogen. | Non-pyrogenic |
| Hemocompatibility ISO 10993-4 Rabbit Blood Direct and Indirect (Extract) Hemolysis | Determine the potential hemolytic activity, via the induction of increased levels of free plasma hemoglobin in rabbit blood, in response to the test article (direct) and its extract (indirect). | Non-hemolytic in both direct and indirect hemolysis tests |
{11}
K243383 CHIKAI Nexus 014
| Hemocompatibility ISO 10993-4 Complement Activation (SC5b-9) | Human plasma was exposed to the device (direct contact) to determine the potential activation of the SC5b-9 complement system. | Non-activator; The concentration of SC5b-9 in the plasma exposed to the device was not statistically different from those of negative and untreated control. |
| --- | --- | --- |
| Hemocompatibility ISO 10993-4 Thrombogenicity | Compared and evaluated the thrombogenicity properties of direct blood contacting components of the subject and predicate devices in vivo. | Subject and predicate devices showed similar thrombogenic potential. |
# CONCLUSION:
The CHIKAI Nexus 014 has the same intended use and the same or similar technological characteristics, such as components, design, materials, sterilization method, and operating principles as the predicate device. The differences between the subject and predicate device do not raise different or new questions of safety or effectiveness.
Performance data demonstrate that the device functions as intended. Therefore, the CHIKAI Nexus 014 is substantially equivalent to the predicate device.
Page 8 of 8
Predicate graph will load when search results are available.
Embedding visualization will load when search results are available.
PDF viewer will load when search results are available.
Loading panels...
Select an item from Submissions
Click any panel, subpart, regulation, product code, or device to see details here.
Section Matches
Results will appear here.
Product Code Matches
Results will appear here.
Special Control Matches
Results will appear here.
Loading collections...
Loading
My Alerts
You will receive email notifications based on the filters and frequency you set for each alert.
Sort by:
Create Alert
Search Filters
Agent Token
Create a read-only bearer token for Claude, ChatGPT, or other agents that can call HTTP APIs.
Copy this now. It will not be shown again.
Connected apps
Apps you authorized through browser sign-in. Disconnecting revokes their access immediately.
Learn the FDA Browser
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.