K Number
K220998
Date Cleared
2022-08-24

(142 days)

Product Code
Regulation Number
882.5890
Reference & Predicate Devices
Predicate For
AI/MLSaMDIVD (In Vitro Diagnostic)TherapeuticDiagnosticis PCCP AuthorizedThirdpartyExpeditedreview
Intended Use
  1. When using Electrical Muscle Stimulation, Transcutaneous Electrical Nerve Stimulator is intended:
  • for users with conditions or disease that are associated with impaired (poor) blood flow in the legs/ ankles/ feet, the device through the foot-pads is intended for use as an adjunctive treatment (as an addition to your existing treatment) to temporarily reduce lower extremity pain, swelling and cramping
  • to temporarily increase local blood circulation in healthy leg muscles
  • to stimulate healthy muscles in order to improve and facilitate muscle performance
  • to temporarily relieve pain associated with sore and aching muscles in the shoulder, waist, back, upper extremities (arms) and lower extremities(legs) due to strain from exercise or normal household duties
  • to relax muscle spasm
  • to increase blood flow circulation
  • for prevention of retardation of disuse atrophy
  • for muscle re-education
  • for maintaining or increasing range of motion
  • Immediate post-surgical stimulation of calf muscles to prevent venous thrombosis
  • Provide quadricep strengthening
  • Improve knee stability secondary to quadricep strengthening
  1. When using Transcutaneous Electrical Nerve Stimulator to deliver Transcutaneous Electrical Nerve Stimulation (TENS), it is intended to provide:
  • symptomatic relief and management of chronic, intractable pain
  • relief of pain associated with arthritis
  • temporarily relieves pain associated with sore and aching muscles in the shoulder, waist, back, upper extremities (arms) and lower extremities (legs) due to strain from exercise or normal household duties
Device Description

Transcutaneous Electrical Nerve Stimulator is a product that adopts modern electronic science and technology to deliver electric pulses generated to the user's skin through the electrodes. The proposed model KTR-405 provides a combination of transcutaneous electrical nerve stimulation (TENS) and electrical muscle stimulation (EMS). It has the following basic characteristics: 1) 10 modes to satisfy different demands. Modes 1-8 are for foot and can be switched to another mode for a minute automatically, while mode 9 is for knee and mode 10 for body. Modes for foot, knee and body can be switched manually during a session; 2) wonderful electric pulse combination, 0~150 levels can be adjusted and chosen according to personal preference; 3) rechargeable battery which can work up to 36 hours 4) wireless and rechargeable remote control allows easy control of the device 5) use while seated or reclining with Relax and Recline mode; 6)foot cover helps keep feet warm and cosy; 7) LCD display and power display make the operation simple and easy; 8) carry handle for easy transportation; 9) magnetic power cable for simple and safe connection. Transcutaneous Electrical Nerve Stimulator is mainly composed of the host and electrode patches. And it can be run either from the mains power supply or via its internal rechargeable battery. To start therapy, you need to connect the device to the mains power supply. This will charge the battery, allowing you to use the device wirelessly in subsequent sessions. Then while seated, place both your bare feet onto the footpads of the device or paste the electrode pads onto painful areas and press on/off button to power on. The modes and intensity can be selected according to needs. And the current status is displayed on LCD.

AI/ML Overview

I am unable to provide information about the acceptance criteria and study proving device efficacy based on the provided text. The document is an FDA 510(k) clearance letter for a Transcutaneous Electrical Nerve Stimulator (TENS), Model: KTR-405.

Here's why:

  • 510(k) Clearance vs. Clinical Efficacy: A 510(k) clearance primarily focuses on demonstrating "substantial equivalence" to a legally marketed predicate device, not necessarily extensive clinical efficacy trials. The manufacturer demonstrates that the new device is as safe and effective as a previously cleared device.
  • Lack of Clinical Study Details: The document explicitly states "Clinical information: Not applicable" (page 10). This confirms that no clinical studies were performed or submitted for this particular 510(k) application to prove the device's performance against specific acceptance criteria in patient populations.
  • Non-Clinical Studies: The "Non-clinical studies and tests performed" section (page 9-10) focuses on engineering and safety standards (e.g., IEC standards for electrical safety, ISO standards for biocompatibility, software verification). These are crucial for safety but do not provide clinical performance metrics like sensitivity, specificity, or changes in patient outcomes.
  • Predicate Device Comparison: The comparison table between the subject device and the predicate device (pages 6-7) mainly highlights similarities in intended use, regulations, and basic technical specifications. It does not include performance data or acceptance criteria that would typically be found in a clinical study report.

Therefore, the provided text does not contain the information needed to answer your questions about acceptance criteria or a study proving device performance as you've requested. The "reported device performance" in the context of this document is adherence to safety and performance standards for TENS devices, rather than clinical effectiveness metrics.

{0}------------------------------------------------

Image /page/0/Picture/0 description: The image contains 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.

August 24, 2022

Shenzhen Kentro Medical Electronics Co., Ltd. % Yvonne Liu Registration Engineer Feiying Drug & Medical Consulting Technical Service Group Rm 2401 Zhenye International Business Center, No. 3101-90. Oianhai Road Shenzhen, Guangdong 518052 China

Re: K220998

Trade/Device Name: Transcutaneous Electrical Nerve Stimulator, Model: KTR-405 Regulation Number: 21 CFR 882.5890 Regulation Name: Transcutaneous Electrical Nerve Stimulator For Pain Relief Regulatory Class: Class II Product Code: NUH, NGX, IPF, NYN, GZJ Dated: July 12, 2022 Received: July 18, 2022

Dear Yvonne Liu:

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.

{1}------------------------------------------------

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 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.

for Tushar Bansal, PhD Acting Assistant Director, Acute Injury Devices Team DHT5B: Division of Neuromodulation and Physical Medicine Devices OHT5: Office of Neurological and Physical Medicine Devices Office of Product Evaluation and Quality Center for Devices and Radiological Health

Enclosure

{2}------------------------------------------------

Indications for Use

510(k) Number (if known) K220998

Device Name

Transcutaneous Electrical Nerve Stimulator, Model: KTR-405

Indications for Use (Describe)

    1. When using Electrical Muscle Stimulation, Transcutaneous Electrical Nerve Stimulator is intended:
  • for users with conditions or disease that are associated with impaired (poor) blood flow in the legs/ ankles/ feet, the device through the foot-pads is intended for use as an adjunctive treatment (as an addition to your existing treatment) to temporarily reduce lower extremity pain, swelling and cramping
  • · to temporarily increase local blood circulation in healthy leg muscles
  • · to stimulate healthy muscles in order to improve and facilitate muscle performance
  • · to temporarily relieve pain associated with sore and aching muscles in the shoulder, waist, back, upper extremities
  • (arms) and lower extremities(legs) due to strain from exercise or normal household duties
  • · to relax muscle spasm
  • to increase blood flow circulation
  • · for prevention of retardation of disuse atrophy
  • for muscle re-education
  • · for maintaining or increasing range of motion
  • · Immediate post-surgical stimulation of calf muscles to prevent venous thrombosis
  • · Provide quadricep strengthening
  • · Improve knee stability secondary to quadricep strengthening
  1. When using Transcutaneous Electrical Nerve Stimulator to deliver Transcutaneous Electrical Nerve Stimulation (TENS), it is intended to provide:
  • symptomatic relief and management of chronic, intractable pain
  • · relief of pain associated with arthritis

· temporarily relieves pain associated with sore and aching muscles in the shoulder, waist, back, upper extremities (arms) and lower extremities (legs) due to strain from exercise or normal household duties

Type of Use (Select one or both, as applicable)

| Prescription Use (Part 21 CFR 801 Subpart D)

X 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."

{3}------------------------------------------------

510(k) Summary K220998

This "510(k) Summary" of 510(k) safety and effectiveness information is submitted in accordance with requirements of Title 21, CFR Section 807.92.

(1) Applicant information:

510(k) owner's name:SHENZHEN KENTRO MEDICAL ELECTRONICS CO., LTD
Address:2nd Floor No 11, Shanzhuang Road, Xikeng Village, YuanshanStreet, Longgang District, Shenzhen City, GuangdongProvince,China
Contact person:Zewu Zhang
Phone number:+86 755 3382 5998
Fax number:+86 755 3382 5996
Email:522378976@qq.com
Date of summary prepared:August 24, 2022

(2) Reason for submission

New device, there were no prior submissions for the device.

(3) Proprietary name of the device

Trade name/model:Transcutaneous Electrical Nerve Stimulator/ KTR-405
Common name:Stimulator, Nerve, Transcutaneous, Over-The-Counter;Stimulator, Muscle, Powered, For Muscle Conditioning;Stimulator, Muscle, Powered;Stimulator, Electrical, Transcutaneous, For Arthritis;Stimulator, Nerve, Transcutaneous, For Pain Relief
Regulation number:21 CFR 882.5890, 890.5850
Product code:NUH, NGX, IPF, NYN, GZJ
Review panel:Neurology, Physical Medicine
Regulation class:Class II

(4) Predicate device

Predicate device
SponsorACTEGY LTD
Device Name and ModelRevitive Medic CoachModel: 5575AQ

{4}------------------------------------------------

510(k) NumberK210825
Product CodeNGX, NUH, IPF, NYN, GZJ
Regulation Number21 CFR 890.5850, 882.5890
Regulation ClassII

(5) Description/ Design of device:

Transcutaneous Electrical Nerve Stimulator is a product that adopts modern electronic science and technology to deliver electric pulses generated to the user's skin through the electrodes.

The proposed model KTR-405 provides a combination of transcutaneous electrical nerve stimulation (TENS) and electrical muscle stimulation (EMS). It has the following basic characteristics: 1) 10 modes to satisfy different demands. Modes 1-8 are for foot and can be switched to another mode for a minute automatically, while mode 9 is for knee and mode 10 for body. Modes for foot, knee and body can be switched manually during a session; 2) wonderful electric pulse combination, 0~150 levels can be adjusted and chosen according to personal preference; 3) rechargeable battery which can work up to 36 hours 4) wireless and rechargeable remote control allows easy control of the device 5) use while seated or reclining with Relax and Recline mode; 6)foot cover helps keep feet warm and cosy; 7) LCD display and power display make the operation simple and easy; 8) carry handle for easy transportation; 9) magnetic power cable for simple and safe connection.

Transcutaneous Electrical Nerve Stimulator is mainly composed of the host and electrode patches. And it can be run either from the mains power supply or via its internal rechargeable battery. To start therapy, you need to connect the device to the mains power supply. This will charge the battery, allowing you to use the device wirelessly in subsequent sessions. Then while seated, place both your bare feet onto the footpads of the device or paste the electrode pads onto painful areas and press on/off button to power on. The modes and intensity can be selected according to needs. And the current status is displayed on LCD.

(6) Intended use / indications:

  1. When using Electrical Muscle Stimulation, Transcutaneous Electrical Nerve Stimulator is intended:

· for users with conditions or disease that are associated with impaired (poor) blood flow in the legs/ ankles/ feet, the device through the foot-pads is intended for use as an adjunctive treatment (as an addition to your existing treatment) to temporarily reduce lower extremity pain, swelling and cramping

  • · to temporarily increase local blood circulation in healthy leg muscles
  • · to stimulate healthy muscles in order to improve and facilitate muscle performance

{5}------------------------------------------------

· to temporarily relieve pain associated with sore and aching muscles in the shoulder, waist, back, upper extremities (arms) and lower extremities (legs) due to strain from exercise or normal household duties

  • to relax muscle spasm
  • to increase blood flow circulation
  • for prevention of retardation of disuse atrophy
  • for muscle re-education
  • · for maintaining or increasing range of motion
  • · Immediate post-surgical stimulation of calf muscles to prevent venous thrombosis
  • · Provide quadricep strengthening
  • · Improve knee stability secondary to quadricep strengthening
  1. When using Transcutaneous Electrical Nerve Stimulator to deliver Transcutaneous Electrical Nerve Stimulation (TENS), it is intended to provide:
  • · symptomatic relief and management of chronic, intractable pain
  • relief of pain associated with arthritis

· temporarily relieves pain associated with sore and aching muscles in the shoulder, waist, back, upper extremities (arms) and lower extremities (legs) due to strain from exercise or normal household duties

(7) Materials

Component nameMaterial ofComponentBody ContactCategoryContact Duration
Electrode padsEVA foam, carbon film, hydrogel, PETSurface skin contactLess than 24 hours
Foot padsSilica gelSurface skin contactLess than 24 hours

We have directly purchased the electrode pads from qualified supplier which has obtained FDA clearance with a 510(k) number of K171381 and been legally marketed to US market. Also we've conducted biocompatibility tests for foot pads and all pass. For details, please refer to "Biocompatibility Discussion".

(8) Technological characteristics and substantial equivalence

{6}------------------------------------------------

ItemSubject devicePredicate deviceRemark
Trade nameTranscutaneous ElectricalNerve StimulatorModel: KTR-405Revitive Medic CoachModel: 5575AQ/
510 (k) numberK220998K210825/
Regulation number21 CFR 882.5890, 890.585021 CFR 882.5890, 890.5850Same
Regulation descriptionTranscutaneous electrical nervestimulator for pain relief;powered muscle stimulatorTranscutaneous electricalnerve stimulator for painrelief; powered musclestimulatorSame
Product codeNUH, NGX, IPF, NYN, GZJNGX, NUH, IPF, NYN, GZJSame
ClassIIIISame
Indications for use/Intended use1) When using ElectricalMuscle Stimulation,Transcutaneous ElectricalNerve Stimulator is intended:• for users with conditions ordisease that are associatedwith impaired (poor) bloodflow in the legs/ ankles/ feet,the device through thefoot-pads is intended for useas an adjunctive treatment (asan addition to your existingtreatment) to temporarilyreduce lower extremity pain,swelling and cramping• to temporarily increaselocal blood circulation inhealthy leg muscles• to stimulate healthymuscles in order to improveand facilitate muscleperformance• to temporarily relieve painassociated with sore andaching muscles in theshoulder, waist, back, upperextremities (arms) and lowerextremities (legs) due to strainfrom exercise or normalhousehold duties• to relax muscle spasmWhen using Electrical MuscleStimulation (NMES),Revitive is intended:• for users with conditions ordisease that are associatedwith impaired (poor) bloodflow in the legs/ ankles/ feet,NMES though the foot-padsis intended for use as anadjunctive treatment (as anaddition to your existingtreatment) to temporarilyreduce lower extremity pain,swelling and cramping•to temporarily increase localblood circulation in healthyleg muscles•to stimulate healthy musclesin order to improve andfacilitate muscle performance•to temporarily relieves painassociated with sore andaching muscles in theshoulder, waist, back, upperextremities (arms) and lowerextremities(legs)due to strain from exercise ornormal household duties•for relaxation of musclespasm,•for increase of blood flowSame
to increase blood flow circulationcirculation, for prevention of retardation
for prevention ofof disuse atrophy,
retardation of disuse atrophyfor muscle re-education,
for muscle re-educationfor maintaining or
for maintaining orincreasing range of
increasing range of motionmotion,and
Immediate post-surgicalImmediate post-surgical
stimulation of calf muscles tostimulation of calf muscles to
prevent venous thrombosisprevent venous thrombosis
Provide quadricepProvide quadricep
strengtheningstrengthening
Improve knee stabilityImprove knee stability
secondary to quadricepsecondary to quadricep
strengtheningstrengthening
2) When using(2) When using Revitive to
Transcutaneous Electricaldeliver Transcutaneous
Nerve Stimulator to deliverElectrical Nerve Stimulation
Transcutaneous(TENS), it is intended to
Nerve Stimulation (TENS), itprovide:
is intended to provide:symptomatic relief and
symptomatic relief andmanagement of chronic,
management of chronic,intractable pain
intractable painrelief of pain associated with
relief of pain associatedarthritis
with arthritistemporarily relieves pain
temporarily relieves painassociated with sore and
associated with sore andaching muscles in the
aching muscles in theshoulder, waist, back, upper
shoulder, waist, back, upperextremities (arms) and lower
extremities (arms) and lowerextremities (legs) due to strain
extremities (legs) due to strainfrom exercise or normal
from exercise or normalhousehold duties
household duties
Patient populationAdultNot publicly available/
OTC or prescriptionOTCOTCSame
Basic unit specification
Power supplyAdaptor Input: 100-240AC, 50-60Hz, 0.2AOutput:5V, 1AUnit Input: 5V, 1ANot publicly available/
Leakage currentNo earth leakage currentNot publicly available/
Number of outputmodes10Not publicly available/
Number of outputchannel2Not publicly available/
Output intensitylevel150Not publicly available/
-Synchronous orAlternating?SynchronousNot publicly available/
Software/Firmware/MicroprocessorControl?YesNot publicly available/
AutomaticOverloadtripNoNot publicly available/
Automatic no-loadtripNoNot publicly available/
Patient overridecontrol methodOn/Off buttonNot publicly available/
Indicator display-On/Off status-Low battery-Output mode-Time to cut-offYesYesYesYesNot publicly available/
Automatic ShutOffYesNot publicly available/
Dimensions (inmm)330 (W) x 327 (H) x 92 (D)Not publicly available/
Weight1.5Kg (Without accessories)Not publicly available/
Housing materialand constructionABSNot publicly available/
Compliance withvoluntarystandardsIEC 60601-1IEC 60601-1-2IEC 60601-2-10IEC 60601-1-11ISO10993-5ISO10993-10Not publicly available/
Compliance with21CFR 882 and890YesNot publicly available/
Output specifications
WaveformBiphasic, Pulsed symmetric, rectangular waveNot publicly available/
Net Charge (per pulse)0Not publicly available/
Maximum Phase Charge (@500Ω)Footpads: 52.9µCArthro-Kentro pads: 24.18µCTENS pads: 9.8µCNot publicly available/
Maximum Average Current(@500Ω)Footpads: 8.31mAArthro-Kentro pads: 4.67mATENS pads: 6.85mANot publicly available/
Maximum current density (@500Ω)Footpads: 0.041mA/cm²Arthro-Kentro pads: 0.039mA/cm²TENS pads: 0.132mA/cm²Not publicly available/
Maximum power density (@500Ω)Footpads: 0.00017W/cm²Arthro-Kentro pads: 0.00009W/cm²TENS pads: 0.00045W/cm²Not publicly available/
Pulse frequency1Hz-100Hz (±5%)Not publicly available/
Pulse durationTENS: 100-120µsEMS: 370-400µs and 950µsNot publicly available/

{7}------------------------------------------------

{8}------------------------------------------------

{9}------------------------------------------------

(9) Non-clinical studies and tests performed:

Non-clinical testings have been conducted to verify that the Transcutaneous Electrical Nerve Stimulator meets all design specifications which supports the conclusion that it's Substantially Equivalent (SE) to the predicate device. The testing results demonstrate that the subject device complies with the following standards:

  • A IEC 60601-1, Medical electrical equipment -- Part 1: General requirements for basic safety and essential performance
  • A IEC 60601-1-2, Medical electrical equipment - Part 1-2: General requirements for basic safety and essential performance - Collateral standard: Electromagnetic disturbances - Requirements and tests

{10}------------------------------------------------

  • IEC 60601-1-11, Medical electrical equipment -- Part 1-11: General requirements for A basic safety and essential performance -- Collateral standard: Requirements for medical electrical equipment and medical electrical systems used in the home healthcare environment
  • IEC 60601-2-10, Medical electrical equipment -- Part 2-10: Particular requirements for the basic safety and essential performance of nerve and muscle stimulators

The body-contacting components of this device are electrode patches and footpads. We have directly purchased the electrode patches from qualified supplier which has obtained FDA clearance with a 510(k) number of K171381 and been marketed to US market. The footpads have been tested for biocompatibility by reliable third-party lab. So we have reason to believe that the electrode patches are safe for the users. The electrode patches and foot pads comply with the following standards.

  • A ISO 10993-5, Biological Evaluation of Medical Devices -- Part 5: Tests for InVitro Cytotoxicity
  • A ISO 10993-10, Biological Evaluation of Medical Devices - Part 10: Tests for Irritation and Skin Sensitization.

We have also conducted:

  • Software verification and validation test according to the requirements of the FDA A "Guidance for Pre Market Submissions and for Software Contained in Medical Devices"
  • The waveform test report has also been conducted to verify the output specifications A of the device according to Guidance for Transcutaneous Electrical Nerve Stimulator for Pain Relief Intended for Over the Counter Use

(10) Clinical information

Not applicable.

(11) Conclusion

Based on the above analysis and non-clinical tests performed, it can be concluded that subject device Transcutaneous Electrical Nerve Stimulator is as safe, as effective and performs as well as the legally marketed predicate device.

§ 882.5890 Transcutaneous electrical nerve stimulator for pain relief.

(a)
Identification. A transcutaneous electrical nerve stimulator for pain relief is a device used to apply an electrical current to electrodes on a patient's skin to treat pain.(b)
Classification. Class II (performance standards).