K171381 · Shenzhen Quality Medical Technology Co.,Ltd · GXY · Dec 13, 2017 · Neurology
Device Facts
Record ID
K171381
Device Name
Adhesive Electrodes
Applicant
Shenzhen Quality Medical Technology Co.,Ltd
Product Code
GXY · Neurology
Decision Date
Dec 13, 2017
Decision
SESE
Submission Type
Traditional
Regulation
21 CFR 882.1320
Device Class
Class 2
Attributes
Therapeutic
Indications for Use
The Adhesive Electrodes are intended to transmit electrical current to patient skin for TENS (Transcutaneous Electrical Nerve Stimulation) and EMS (Electrical Muscular Stimulation) applications. It is for OTC (Over-The -Counter) or Prescription use and is to be used for adults only.
Device Story
Adhesive electrodes; multi-layer flexible structure; transmit electrical current from stimulator to patient skin. Input: electrical current via snap button; transformation: current passes through conductive carbon film to biocompatible self-adhesive conductive hydrogel; output: electrical stimulation to skin. Used in clinical or home settings; operated by patients or healthcare providers. Device acts as interface between stimulator and patient; facilitates TENS/EMS therapy for pain management or muscle stimulation. Benefits: reusable, conductive interface for electrical therapy.
Clinical Evidence
Bench testing only. No clinical data included. Performance evaluated via electrical impedance, adhesive performance, current dispersion, peel force, and reuse testing. Biocompatibility verified per ISO 10993-5 (cytotoxicity) and ISO 10993-10 (sensitization). Shelf life validated per ASTM F1980-16.
Technological Characteristics
Multi-layer flexible structure: EVA foam backing, carbon film conductor, biocompatible self-adhesive conductive hydrogel, PET protective liner. Dimensions: 40mm x 70mm x 3mm. Electrical connection via snap button. Non-sterile. A.C. Impedance <300 ohms. Biocompatible per ISO 10993-5/10.
Indications for Use
Indicated for adults requiring TENS or EMS therapy via transcutaneous electrical current transmission. No specific contraindications listed.
Regulatory Classification
Identification
A cutaneous electrode is an electrode that is applied directly to a patient's skin either to record physiological signals (e.g., the electroencephalogram) or to apply electrical stimulation.
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December 13, 2017
ShenZhen Quality Medical Technology Co.,Ltd % Jet Li Regulation Manager Guangzhou LETA Testing Technology Co., Ltd 6F, No.1 TianTai road, Science City, LuoGang District Guangzhou. Guangdong, CN
Re: K171381
Trade/Device Name: Adhesive Electrodes Regulation Number: 21 CFR 882.1320 Regulation Name: Cutaneous Electrode Regulatory Class: Class II Product Code: GXY Dated: October 28, 2017 Received: November 6, 2017
Dear Jet Li:
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. 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); 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.
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 the CDRH's Office of Surveillance and Biometrics/Division of Postmarket Surveillance.
For comprehensive regulatory information about mediation-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.
Vivek J. Pinto -S
for Carlos L. Peña, PhD, MS Director Division of Neurological and Physical Medicine Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
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# Indications for Use
510(k) Number (if known) K171381
Device Name Adhesive Electrodes
Indications for Use (Describe)
The Adhesive Electrodes are intended to transmit electrical current to patient skin for TENS (Transcutaneous Electrical Nerve Stimulation) and EMS (Electrical Muscular Stimulations. It is for OTC (Over-The -Counter) or Prescription use and is to be used for adults only.
| Type of Use (Select one or both, as applicable) | |
|-------------------------------------------------|--|
| | |
|X | Prescription Use (Part 21 CFR 801 Subpart D)
|X | Over-The-Counter Use (21 CFR 801 Subpart C)
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# 510(k) Summary
This summary of 510(K) safety and effectiveness information is being submitted in accordance with the requirement of 21 CFR 807.92.
#### 1. Date of the summary prepared: December 11, 2017
#### 2. Submitter's Information
#### Sponsor:
510(k) Owner's Name: ShenZhen Quality Medical Technology Co.,Ltd
Establishment Registration Number: N/A
Address: 5/F, Plant C3, No.1, Nuclear Power Industrial Zone, Guanlan Shijing
Community,
Guanlan Street, Longhua New Area, Shenzhen, Guangdong
Phone: +86(755)29016583
Fax: +86(755)29016583
Contact Person: Grace Zhao
E-mail: qd0755@163.com
#### Application Correspondent:
Guangzhou LETA Testing Technology Co., Ltd. Address: 6F, No.1 TianTai road, Science City, LuoGang District, GuangZhou
#### City.China
Contact Person: Mr. Jet Li Tile: Regulation Manager Tel: +86-18588874857 Email: med-jl@foxmail.com
#### 3. Subject Device Information
- Adhesive Electrodes Trade Name: �
- Cutaneous electrode Common Name: �
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- Classification name: Electrode, Cutaneous �
- � Review Panel: Neurology
- Product Code: GXY �
- Regulation Class: ll �
- Regulation Number: 882.1320 �
# 4. Predicate Device Information
#### Predicate Device 1
| Sponsor | Wandy Rubber Industrial Co., Ltd |
|-------------------|----------------------------------|
| Device Name | Wandy Self-adhesive Electrodes |
| 510(k) Number | K132998 |
| Product Code | GXY |
| Regulation Number | 882.1320 |
| Regulation Class | 2 |
# Predicate Device 2
| Sponsor | GMDASZ Manufacturing Co., Ltd |
|-------------------|-------------------------------|
| Device Name | Adhesive Electrodes |
| 510(k) Number | K160138 |
| Product Code | GXY |
| Regulation Number | 882.1320 |
| Regulation Class | 2 |
# 5. Device Description
The Adhesive Electrodes transmit electrical current to patient skin, the electrical current is first transmitted via the snap button then transmitted to the conductive gel which is adhered to patient skin.
Adhesive Electrodes are multi-layer reusable, flexible structures, composed of laminated materials commonly used in this application:
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EVA foam First layer: Insulating backing material: Second layer: Conductive film: Carbon film Third layer: Biocompatible self-adhesive conductive hydrogel Protective liner: PET
The dimension of the adhesive electrode is 40 mm (L) × 70 mm (W) ×3mm (H).
# 6. Intended Use / Indications for Use
The Adhesive Electrodes are intended to transmit electrical current to patient skin for TENS (Transcutaneous Electrical Nerve Stimulation) and EMS (Electrical Muscular Stimulation) applications. It is for OTC (Over-The -Counter) or Prescription use and is to be used for adults only.
# 7. Bench Testing (Non-clinical)
Compare to primary predicate devices specified in K132998 and K160138, our device and the predicate devices are same in, raw materials, physical features, and same manufacturing processes. The biocompatibility performance equivalence evidence of proposed electrode can be demonstrated according to ISO10993-1, ISO10993-5 and ISO10993-10.
The proposed Electrode evaluated through Electrode Performance testing (Electrical Impedance Performance, Adhesive Performance, Current dispersion and Peel force ), Biocompatibility testing and Reuse testing.
The non-clinical tests demonstrated that the subject device is as safe, as effective, and performs as well as the legally marketed predicate devices.
# 8. Clinical Test Conclusion
No clinical study is needed to be included in this submission.
# 9. Test Summary
Sensitivity testing criteria as specified in ISO 10993-10 and cytotoxicity testing criteria as specified in ISO 10993-5.
ISO 14971:2007 Medical Device, Harm Control Application to Medical Device Shelf life testing according to FDA recognized standard ASTM F1980 - 16 (Standard Guide for Accelerated Aging of Sterile Barrier Systems for Medical Devices)
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# 10. Comparison to predicate device and conclusion
The technological characteristics, features, specifications, materials, mode of operation, and intended use of Electrode piece is substantially equivalent to the predicate devices quoted above.
The differences between the subject device and predicate devices do not raise new issues of safety or effectiveness.
| Elements<br>of<br>Comparison | Subject Device | Predicate Device 1 | Predicate Device 2 | Remark |
|--------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|
| Characteristics | | | | |
| Device Name and<br>Model | Adhesive Electrodes | Wandy Self-adhesive<br>Electrodes | Adhesive<br>Electrodes | -- |
| 510 (K) Number | Applying | K132998 | K160138 | -- |
| Intended Use | The Adhesive<br>Electrodes are<br>intended to transmit<br>electrical current to<br>patient skin for TENS<br>(Transcutaneous<br>Electrical Nerve<br>Stimulation) and<br>EMS (Electrical<br>Muscular Stimulation)<br>applications. It is for<br>OTC (Over-The<br>-Counter) or<br>Prescription use and<br>is to be used for<br>adults only. | Wandy Self-adhesive<br>Electrode is intended to<br>transmit electrical current<br>to patient skin for<br>TENS (Transcutaneous<br>Electrical Nerve<br>Stimulation) and EMS<br>(Electrical Muscular<br>Stimulation) applications,<br>for OTC (Over-The<br>-Counter) or Prescription<br>use. The Electrode<br>are used for adults only. | The adhesive<br>electrodes<br>are intended for as a<br>reusable, conductive<br>adhesive interface<br>between<br>the patient's skin and<br>the<br>marketed electrical<br>stimulators (i.e.<br>TENS<br>(Transcutaneous<br>Electrical<br>Nerve Stimulation),<br>EMS<br>(Electrical Muscular<br>Stimulation), IF<br>(Interferential) or<br>PGF<br>(Pulsed Galvanic<br>Stimulation) for<br>transmitting electrical<br>current. The<br>electrode is<br>for OTC (Over-The-<br>Counter) or | SE |
| Elements<br>of<br>Comparison | Subject Device | Predicate Device 1 | Predicate Device 2 | Remark |
| Product Code | GXY | GXY | GXY<br>Prescription use. | SE |
| Regulation<br>Number | 882.1320 | 882.1320 | 882.1320 | SE |
| OTC or<br>Prescription | OTC and Prescription | OTC and Prescription | OTC and<br>Prescription | SE |
| Intended patient<br>population | adults | adults | -- | SE |
| Single Patient Use | Single Patient Use | Single Patient Use | Single Patient Use | SE |
| Reusable | Reusable | Reusable | Reusable | SE |
| Design Feature | Three layers:<br>1. Insulation backing<br>material: EVA foam<br>2. Conductive film:<br>Carbon film<br>3.Conductive<br>hydrogel | Three layers:<br>1. Insulating backing<br>material: Woven<br>Fabric/Foam<br>2. Conductor:<br>Aluminum/Carbon<br>3. Conductive hydrogel | Three layers:<br>1. Insulation backing<br>material:<br>Fabric/Foam/Tan<br>fabric<br>2. Conductive film:<br>Carbon film/Carbon<br>film coated with<br>silver/Aluminum foil<br>film<br>3. Conductive<br>hydrogel | SE |
| Protective Liner | PET | PET | PET | SE |
| Electrical<br>Connection | Snap button | Snap button or lead wire | Snap button or lead<br>wire | SE |
| Non-sterile | Non-sterile | Non-sterile | Non-sterile | SE |
| Reusable | Reusable | Reusable | Reusable | SE |
| A.C. Impedance | <300 ohms | <300 ohms | <300 ohms | SE |
| Biocompatibility | All user directly<br>contacting materials<br>are compliance with | All user directly<br>contacting materials are<br>compliance<br>with | Has passed the<br>required skin<br>sensitivity testing | SE |
| Elements of<br>Comparison | Subject Device | Predicate Device 1 | Predicate Device 2 | Remark |
| | ISO10993-5 and<br>ISO10993-10<br>requirements. | ISO10993-5 and<br>ISO10993-10<br>requirements. | criteria as<br>specified in the<br>Tripartite<br>Biocompatibility<br>Guidance for Medical<br>Devices and ISO<br>10993-1<br>requirements for skin<br>contact. These tests<br>include Cytotoxicity,<br>Sensitization and<br>Primary Skin Irritation<br>Tests. | |
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# Finial Conclusion:
Based on the indication for use, technology characteristics, and performance testing, the proposed device has been shown to be appropriate for its indication for use and is considered to be substantially equivalent to the primary predicate device and reference device.
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.