The UV Radiation Treatment System models YK-6000A, YK-6000A-T, YK-6000B, andYK-6000B-T, are intended for use under the direction of a physician, for the treatment of vitiligo, psoriasis, and eczema. The devices are intended for treatment of these conditions on Fitzpatrick Skin Types (I-VI).
Device Story
Portable UV radiation treatment system; consists of UV tubes, irradiator, and control circuit. Models YK-6000A/A-T emit UVA; models YK-6000B/B-T emit UVB. Used in hospitals, clinics, and professional medical environments; operated by healthcare professionals. Device provides partial skin treatment; internal glisten board enhances radiant efficiency. Physician directs treatment; patient receives targeted UV exposure for diagnosed skin disorders. Benefits include therapeutic management of vitiligo, psoriasis, and eczema.
Indicated for treatment of vitiligo, psoriasis, and eczema in patients of all Fitzpatrick Skin Types (I-VI) under physician direction.
Regulatory Classification
Identification
An ultraviolet lamp for dermatologic disorders is a device (including a fixture) intended to provide ultraviolet radiation of the body to photoactivate a drug in the treatment of a dermatologic disorder if the labeling of the drug intended for use with the device bears adequate directions for the device's use with that drug.
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Image /page/0/Picture/0 description: The image shows the logo of the U.S. Food and Drug Administration (FDA). On the left is the Department of Health & Human Services logo. To the right of that is the FDA logo, which is a blue square with the letters "FDA" in white. To the right of the blue square is the text "U.S. FOOD & DRUG ADMINISTRATION" in blue.
Xuzhou Yongkang Electronic Science Technology Co., Ltd % Boyle Wang Official Correspondent Shanghai Truthful Information Technology Co., Ltd. RM. 608, No. 738, Shangcheng Rd., Pudong Shanghai, 200120 Cn
#### Re: K191571
Trade/Device Name: UV Radiation Treatment System Regulation Number: 21 CFR 878.4630 Regulation Name: Ultraviolet Lamp For Dermatologic Disorders Regulatory Class: Class II Product Code: FTC Dated: June 14, 2019 Received: June 14, 2019
#### Dear Boyle Wang:
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 Mavadia-Shukla Acting Assistant Director DHT4A: Division of General Surgery Devices OHT4: Office of Surgical and Infection Control Devices 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) K191571
Device Name UV Radiation Treatment System
Indications for Use (Describe)
The UV Radiation Treatment System models YK-6000A-T, YK-6000B, andYK-6000B-T, are intended for use under the direction of a physician, for the treatment of vitilizo, psoriasis, and eczema. The devices are intended for treatment of these conditions on Fitzpatrick Skin Types (I-VI).
| Type of Use (Select one or both, as applicable) | |
|-------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------|
| <label><input checked="" type="checkbox"/> Prescription Use (Part 21 CFR 801 Subpart D)</label> | <label><input type="checkbox"/> Over-The-Counter Use (21 CFR 801 Subpart C)</label> |
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# Tab #06 510(k) Summary
This summary of 510(k) safety and effectiveness information is being submitted in accordance with requirements of 21 CFR 807.92.
#### 1.0 Submitter's information
Name: Xuzhou Yongkang Electronic Science Technology Co., Ltd Address: 4F Building C8, 40 Jingshan Road, Economic and Technological Development Zone, Xuzhou, Jiangsu,221000,China Tel: 86-516-87892766-601 Fax: 86-516-87892766-606 Contact: Kai Li Date of Preparation: Feb.5,2020
#### Designated Submission Correspondent
Mr. Boyle Wang Shanghai Truthful Information Technology Co., Ltd. Address: Room 608, No. 738 Shangcheng Rd., Pudong Shanghai, 200120 China Tel: +86-21-50313932 Email: Info@truthful.com.cn
#### 2.0 Device information
Trade name: UV Radiation Treatment System Common name: Ultraviolet Lamp for Dermatologic Disorders Classification name: Light, Ultraviolet, Dermatological Model(s): YK-6000A,YK-6000A-T,YK-6000B,YK-6000B-T
#### 3.0 Classification
Production code: FTC Regulation number: 21 CFR 878.4630 Classification: Class II Review Panel: General& Plastic Surgery
#### 4.0 Predicate device information
Manufacturer: Xuzhou Kernel Medical Equipment Co., LTD. UV Phototherapy Device: 510(k) number: K181805
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### 5.0 Indication for Use Statement
The UV Radiation Treatment System models YK-6000A, YK-6000A-T, YK-6000B, andYK-6000B-T, are intended for use under the direction of a physician, for the treatment of vitiligo, psoriasis, and eczema. The devices are intended for treatment of these conditions on Fitzpatrick Skin Types (I-VI).
### 6.0 Device Description
The proposed device, UV Radiation Treatment System is a portable medical device that consists of tubes, irradiator, control circuit. It is a therapeutic product under the direction of a physician for individuals who require ultraviolet radiation for diagnosed skin disorders. It is for the partial treatment. It has four models: YK-6000A,YK-6000A-T,YK-6000B,YK-6000B-T,in which the model YK-6000A and YK-6000A-T emit UVA light and the model YK-6000B and YK-6000B-T emit UVB light.
This product has the features are as follows:
A. Use Philips special UV lamp as light source, with high stability and long service life:
B. Small bulk, lightweight, operation simply, patients can take with themselves;
C. There is glisten board inner radiation unit, which can raise radiant efficiency.
The UV Radiation Treatment System only can be used in Hospital, Clinic, Medical Center, Private Medical Practice, or Other Professional Medical Environments under direction of physician.
#### 7.0 Non-Clinical Test Conclusion
Non clinical tests were conducted by lab bench testing to verify that the proposed device met all design specifications as was Substantially Equivalent (SE) to the predicate device. The test results demonstrated that the proposed device complies with the following standards:
IEC 60601-1:2012, Medical electrical equipment-Part 1: General requirements for basic safety, and essential performance.
IEC 60601-2-57: 2011 Medical electrical equipment Part2-57: Particular requirements for the basic safety and essential performance of non-laser light source equipment intended for therapeutic, diagnostic, monitoring and cosmetic/ aesthetic use.
IEC 60601-1-2:2014, Medical electrical equipment -Part 1-2: General requirements for basic safety and essential performance - Collateral standard: Electromagnetic compatibility - Requirements and tests.
IEC 62471:2006, Photobiological safety of lamps and lamp systems
ISO 10993-5:2009 Biological evaluation of medical devices- Part 5: Test for in
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vitro cytotoxicity
ISO 10993-10:2010 Biological evaluation of medical devices- Part 10: Test for irritation and delayed-type hypersensitivity
ISO 10993-11:2017 Biological evaluation of medical devices- Part 11: Test for systemic toxicity
# 8.0 Clinical Test Conclusion
No clinical study is included in this submission.
# 9.0 Substantial Equivalence Comparison
| Item | Proposed device | Predicated device<br>K181805 | Remark |
|--------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------|
| Product Code | FTC | FTC | SE |
| Regulation No. | 21 CFR 878.4630 | 21 CFR 878.4630 | SE |
| Class | II | II | SE |
| Intended Use | The UV Radiation<br>Treatment System<br>models YK-6000A,<br>YK-6000A-T, YK-6000B,<br>andYK-6000B-T, are<br>intended for use under<br>the direction of a<br>physician, for the<br>treatment of vitiligo,<br>psoriasis, and eczema.<br>The devices are intended<br>for treatment of these<br>conditions on Fitzpatrick<br>Skin Types (I-VI). | The UV Phototherapy<br>is intended for use, by<br>or under the direction<br>of a physician for the<br>treatment of psoriasis,<br>vitiligo, and atopic<br>dermatitis (eczema). It<br>is intended for use on<br>all skin types (I-VI). It<br>can be used in<br>hospitals, clinics and<br>households. | SE |
| Prescriptive | Yes | Yes | SE |
| Mode of operation | Portable | Handheld | Analysis |
| Shell material | ABS | ABS | SE |
| Treatment Area | Partial treatment<br>excluding eyes | Partial treatment<br>excluding eyes | SE |
| Treatment Time | 5~20 min | 0~30min | Analysis |
| UV spectral output | UVA or UVB | UVA or UVB | SE |
| Lamp configuration | 1<br>9W UV tube | 1 or 2<br>9W UV tube | Analysis |
| Power Source | AC outlet | AC outlet or DC jack | Analysis |
| Wavelength range<br>(nm) | UVA:320~400<br>UVB: 300~320 | UVA: 350~400<br>UVB: 310~315 | Analysis |
#### Table1- Technological Characteristic Comparison
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| IPX – Rating / water<br>resistance | IPX0 | IP22 | Analysis |
|------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------|
| Application<br>Environment | Hospital, Clinic, Medical<br>Center, Private Medical<br>Practice, or Other<br>Professional Medical<br>Environments under<br>direction of physician | Hospital, Clinic,<br>Medical Center,<br>Private Medical<br>Practice, or Other<br>Professional Medical<br>Environments,<br>Household use under<br>direction of physician. | Analysis |
| Electrical<br>Safety/Performance | Comply with IEC60601-1<br>and IEC 60601-2-57 | Comply with<br>IEC60601-1 and IEC<br>60601-2-57 | SE |
| Home Use | Not applied | Comply with IEC<br>60601-1-11 | Analysis |
| Sterile | N/A | N/A | SE |
| Single Use | No | No | SE |
| EMC | Comply with IEC<br>60601-1-2 | Comply with IEC<br>60601-1-2 | SE |
| Biocompatibility | Cytotoxicity (ISO<br>10993-5:2009) | Under the conditions of<br>the study, Comply with<br>the requirements | SE |
| | Sensitization (ISO<br>10993-10:2010) | | |
| | Irritation (ISO<br>10993-10:2010) | | |
| | Pyrogen(ISO<br>10993-11:2017) | | |
| | Acute Systemic<br>Toxicity(ISO<br>10993-11:2017) | | |
| Label and Labeling | Conforms to FDA<br>Regulatory<br>Requirements | Conforms to FDA<br>Regulatory<br>Requirements | SE |
Analysis:
The predicate device has the models which can support household use. The proposed device is not recommended household use, it just can be used in the professional medical environments under the guidance of doctors. In addition, the proposed device is substantially equivalent to the predicate device. The differences between both devices are insignificant in terms of safety and effectiveness. Based on the nonclinical and clinical tests performed, the subject device is as safe, as effective, and performs as well as the legally marketed predicate device.
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#### 10.0 Conclusion
The conclusions drawn from the comparison and analysis above demonstrate that the proposed device is as safe, as effective, and performs as well as the legally marketed predicated device and raises no new questions of safety or effectiveness. The differences between both devices are insignificant in terms of safety and effectiveness.
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.