K Number
K083229
Date Cleared
2009-02-23

(112 days)

Product Code
Regulation Number
870.2300
Reference & Predicate Devices
Predicate For
AI/MLSaMDIVD (In Vitro Diagnostic)TherapeuticDiagnosticis PCCP AuthorizedThirdpartyExpeditedreview
Intended Use

Each module has specific feature and intended use

  1. Pulse Oximeter:
    To spot check or monitor Oxygen saturation of arterial hemoglobin (SpO2%) and pulse rate.
    To analyze the pulse waveform (Photoelectrical Plethysmography or PP) provided by the oximeter. It only provides mathematical analyses of the input of the SpO2 measurement.
  2. Heart rate variability (HRV) :
    To analyze the basic rhythms of the NN or RR intervals in heart rate, both in the time domain and in the frequency domain (short time 5 minutes). It only provides mathematical analyses of the input of the heart rate variability.
    The mathematical analysis of Photoelectrical Plethysmography and HRV are not intended use for diagnosis.
    The software provides a visual alarm for the values of the heart rate and/or SpO2 percent out of the normal range and for the bad quality signal transmission.
    The data are stored in PC in the Backup system of the ES Teck software.
    The device is intended use only for adult subjects (> 20 years old)
    This Oximeter is intended to be used in spot-checking (2 minutes)
    The device is intended use in licensed practitioner's office
    This device is no intended to be used at home, in hospital or out-of-hospital transport
    The device is not intended use in support life and not for continuously monitoring
    The system will be use by licensed practitioner.
Device Description

The ES Teck System is a programmable electro medical system (PEMS) including:
. USB plug and play hardware device including an electronic box , 3 disposable clectrodes, reusable Adult SpO2 probe and reusable cables
Software installed on a computer. .
E.S Teck system is a combination of 2 devices (or modules) with specific features controlled by unique software:

Pulse Oximeter displays SpO2%, pulse rate value and vertical bar graph pulse amplitude. The photoelectrical Plethysmograph' feature (PP) analyzes the pulse waveform provided by the oximeter.
A HRV (Heart Rate Variability) evaluates the variation of the heart rate, both in the time domain (statistical methods) and in the frequency domain (spectral analysis). Each ORS complex is detected and the so-called normal (NN) or Rate-to-Rate (RR) intervals between adjacent QRS complexes are resulting from sinus node depolarization.

AI/ML Overview

Here's a breakdown of the acceptance criteria and study information for the Electro Sensor Teck (K083229), based on the provided text:

Important Note: The provided document is a 510(k) summary, which focuses on demonstrating substantial equivalence to predicate devices rather than providing detailed, de-novo clinical trial data with explicit acceptance criteria and performance metrics in the way a modern clinical study report would. As such, the information below is extracted and inferred from the available text. Explicit acceptance criteria and device performance values are generally not stated in a 510(k) summary in the same granular detail as in a full study report.


Acceptance Criteria and Reported Device Performance

Feature/ModuleAcceptance Criteria (Inferred)Reported Device Performance (Inferred)
HRV ModuleSubstantial equivalence to predicate device (Readmyheart K050620) in algorithm and hardware. Accurate heartbeat detection when compared to MIT-BIH database.Algorithm and hardware are exactly the same as the predicate device. Simulator and MIT database comparison study conducted for heartbeat detection function.
SpO2 ModuleSubstantial equivalence to predicate device (Pulse Oximeter MD 300 1 K072825) in overall function, sensor, and software. Compliance with ISO9919.OEM subcontractor provided cleared oximeter, sensor, cables, and software code. Clinical tests performed by OEM subcontractor. Calibration tests (simulator).
Photoelectrical Plethysmography (PP) ApplicationSubstantial equivalence to predicate device (Mc Pulse Photoelectric Plethysmograph K023238) in algorithm and hardware design.Algorithms and hardware design are exactly the same as the predicate device. Published clinical investigations using similar technology and anatomical site.
General Safety and EffectivenessEquivalent in performance, technology, safety, and efficacy to legally marketed predicate devices. Compliance with relevant IEC and AAMI standards (IEC 60601-1-1, IEC 60601-1-2, AAMI EC53, AAMI EC57, ANSI/AAMI EC12, ISO9919).Laboratory tests confirm general safety (IEC 60601-1-2 and IEC 60601-1-1). Device features (combination, USB power, PC display) do not affect performance or effectiveness.
Intended UseAdherence to the intended uses of the predicate devices.Stated intended uses for SpO2, pulse rate, PP analysis, and HRV analysis, with explicit disclaimer that mathematical analyses are not for diagnosis.

Important Context: For this 510(k), the primary "acceptance criterion" is demonstrably that the device is "substantially equivalent" to the identified predicate devices in terms of intended use, technological characteristics, safety, and effectiveness. Direct numerical performance metrics (e.g., sensitivity, specificity, accuracy percentages) are not presented in this summary, as the nature of the submission relies on the established performance of the predicate devices and verification through non-clinical means.


Study Information

  1. Sample Size Used for the Test Set and Data Provenance:

    • HRV Module:
      • Test set: Input data from the MIT-BIH database. The exact number of records or patients from this database used is not specified.
      • Provenance: Retrospective (from the existing MIT-BIH database). Country of origin is not specified but the MIT-BIH database is a well-known international resource.
    • SpO2 Module:
      • Test set: "Clinical tests of the OEM subcontractor." The sample size and provenance (country of origin, retrospective/prospective) are not specified in this 510(k) summary; they refer to tests conducted by the OEM.
    • Photoelectrical Plethysmography (PP) Application:
      • Test set: "Published clinical investigations." The sample sizes and provenance are not specified for these external investigations.
  2. Number of Experts Used to Establish the Ground Truth for the Test Set and Qualifications of Those Experts:

    • HRV Module (MIT-BIH database): The ground truth for the MIT-BIH database is established by expert cardiologists and technicians who annotate the ECG waveforms for heartbeats. The number and specific qualifications of those who originally annotated the MIT-BIH database are not provided in this document but are inherent to the database's creation.
    • SpO2 Module & PP Application: Given that no specific in-house clinical trials are detailed for these components (relying on OEM data and published literature), the number of experts and their qualifications for establishing ground truth are not provided in this submission.
  3. Adjudication Method for the Test Set:

    • Not specified for any of the modules, as the primary method for the HRV module involved comparison against a pre-established database, and for SpO2/PP, it relied on OEM data and peer-reviewed literature.
  4. Multi-Reader Multi-Case (MRMC) Comparative Effectiveness Study:

    • No MRMC comparative effectiveness study was mentioned or performed, as this device primarily involves automated measurements and mathematical analyses, not interpretation by human readers.
  5. Standalone Performance (Algorithm Only Without Human-in-the-Loop Performance):

    • Yes, the evaluation performed is effectively a standalone (algorithm only) performance assessment, as the device's function involves mathematical analysis of physiological signals. Human interpretation is not part of the core performance claim for the mathematical analyses.
    • The "mathematical analysis of Photoelectrical Plethysmography and HRV ARE NOT intended use for diagnosis," explicitly stating they are for "reference only." This reinforces the standalone nature of the algorithmic output without requiring a human-in-the-loop for diagnostic purposes.
  6. Type of Ground Truth Used:

    • HRV Module: Expert-annotated ECG data (from the MIT-BIH database) for heartbeat detection.
    • SpO2 Module: Likely established through highly accurate reference oximeters or CO-oximeters and potentially arterial blood gas measurements (implied by OEM clinical tests for SpO2, though not explicitly stated in this document).
    • Photoelectrical Plethysmography (PP) Application: Not directly mentioned, but inferred to be based on the established physiological principles and analyses validated in the "published clinical investigations" that used "the same technology."
  7. Sample Size for the Training Set:

    • Not specified. The device relies on algorithms that are stated to be "exactly the same as in the predicate device." This suggests the training/development would have occurred during the predicate device's creation or by the OEM, and those details are not part of this 510(k) summary.
  8. How the Ground Truth for the Training Set Was Established:

    • Not specified. Similar to the training set size, the ground truth establishment for the training data would be linked to the development of the predicate device's algorithms or the OEM's development process, which is not detailed in this submission.

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Ko83229

L.D Technology LLC.

FEB 2 3 2009

510(k) Premarket Notification Number: K083229 Preparation date: October, 16 2008

510(k) Summary Electro Sensor Teck / ES Teck

Name of the device: Electro Sensor Teck Model PEMS Common name: E.S Teck Heart Rate variability/Pulse oximeter/Photoelectrical Plethysmograph Regulation number: 21 CFR 870.2340 Product Code: DPS 21 CFR 870 2700 Product Code: DQA 21CFR870.2780 Product Code: JOM Classification: Class II

Classification Advisory: Cardiovascular/Anesthesiology

This summary of 510(k) safety and effectiveness information is submitted in accordance with the requirements of 21 CFR §807.92

  1. Submitter's Identification: Manufacturer: L.D TECHNOLOGY Owner of LD Technology: MAAREK Albert Address: L.D Technology 100 N.Biscayne Blvd, Suite 500 Miami, FL, 33132, USA Tel: 305-379-9900 E mail: albert.ldteck@gmail.com

Contact Information: Consultant and reviewer Richard Clement MD 11459 NW 34 Street Miami FL 33178 Tel: 305-594-2145 Fax: 305-594 2174 Email: richardclementmd@yahoo.com Date of Preparation: September, 20, 2008

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2. Device Name / Classification

Electro Sensor Teck system System components : 21 CFR 870.2340 Product Code: DPS 21 CFR 870 2700 Product Code : DQA 21CFR870.2780 Product Code JOM Classification: Class II Classification Panel: Cardiovascular /Anesthesiology

3. Predicate legally marketed devices

Readmyheart (Model RMH 3.0) K050620 HRV module Applicant: DailyCare BioMedical Inc. Pulse Oximeter MD 300 I, K072825 Applicant: Beijing Choice Electronic Technology Co., Ltd. Mc Pulse Photoelectric Plethysmograph K023238 Applicant: Meridian Co., Ltd.

4. Device Description Description of the features

The ES Teck System is a programmable electro medical system (PEMS) including:

  • . USB plug and play hardware device including an electronic box , 3 disposable clectrodes, reusable Adult SpO2 probe and reusable cables
  • Software installed on a computer. .

E.S Teck system is a combination of 2 devices (or modules) with specific features controlled by unique software:

  • Pulse Oximeter displays SpO2%, pulse rate value and vertical bar graph pulse amplitude. The photoelectrical Plethysmograph' feature (PP) analyzes the pulse waveform provided by the oximeter.

  • A HRV (Heart Rate Variability) evaluates the variation of the heart rate, both in the time domain (statistical methods) and in the frequency domain (spectral analysis). Each ORS complex is detected and the so-called normal (NN) or Rate-to-Rate (RR) intervals between adjacent QRS complexes are resulting from sinus node depolarization.

5. Intended use and indications for use

Each module has specific feature and intended use

    1. Pulse Oximeter:
    • To spot check or monitor Oxygen saturation of arterial hemoglobin (SpO2%) and pulse rate. .
    • To analyze the pulse waveform (Photoelectrical Plethysmography or PP) provided by the oximeter. It only provides mathematical analyses of the input of the SpO2 measurement.
    1. Heart rate variability (HRV) :
    • To analyze the basic rhythms of the NN or RR intervals in heart rate, both in the time . domain and in the frequency domain (short time 5 minutes). It only provides mathematical analyses of the input of the heart rate variability.

The mathematical analysis of Photoelectrical Plethysmography and HRV ARE NOT intended use for diagnosis.

The software provides a visual alarm for the values of the heart rate and/or SpO2 percent out of the normal range and for the bad quality signal transmission.

The data are stored in PC in the Backup system of the ES Teck software.

The device is intended use only for adult subjects (> 20 years old)

This Oximeter is intended to be used in spot-checking (2 minutes)

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The device is intended use in licensed practitioner's office

This device is no intended to be used at home, in hospital or out-of-hospital transport The device is not intended use in support life and not for continuously monitoring The system will be use by licensed practitioner.

6. Performances, specifications and materials Technical specifications

I.e. Device description

Software specifications

The system carries out the following operations:

Image /page/2/Figure/7 description: The image shows a diagram of a system with several interconnected components. The diagram includes blocks labeled "SpO2 %, Pulse rate Oximeter Waves", "Photoelectrical Plethysmography: Mathematical analysis", and "Oximeter measurements". Other components include "SOFTWARE COMMUNICATION PROTOCOLS" and "HARDWARE", suggesting a system involving data acquisition, processing, and communication. The diagram also includes the text "BACK UP" at the top.

7. Contra-indications

  • Patients undergoing external defibrillation .
  • Anyone with erratic, accelerated or mechanically controlled irregular heart rhythms; .
  • . Arterial fibrillation/flutter;
  • . Atrio-ventricular block;

This device should not be used in association with or presence of cardiac pacemakers, patients connected to electronic life support devices, or any implanted electronic device.

  • . 0 Do not use this device in the presence of magnetic resonance imaging (MR or MRI) equipment. MRI equipment may cause induced current to the SpO2 sensor resulting in patient injury.
  • . This device should not be used on pregnant women. The effects on the fetus, as well as accuracy of readings are unknown.
  • When using the finger probe, utilize the arm not in use for blood pressures, arterial lines, . or having an AV fistula or pressure dressing.

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  • Dyes introduced into the bloodstream, such as methylene blue, indocyanine green, indigo . carmine, and fluorescein
  • Significant levels of dysfunctional hemoglobins, such as carboxyhemoglogin or . methhemoglobin, will affect the accuracy of the SpO2 measurement.
  • Any condition that restricts blood flow, such as use of a blood pressure cuff or extremes . in systemic vascular resistance, may cause an inability to determine accurate pulse rate and SpO2 readings
  • Operation of this device may be adversely affected in the presence of strong . electromagnetic sources, such as electro surgery equipment.
  • . Operation of this device may be adversely affected in the presence of computed tomography (CT) equipment.
  • Do not use this device in the presence of flammable anaesthetics; a spark hazard exists . which may result in explosion.
  • . Fingernail polish or false fingernail polish or false fingernails may cause inaccurate SpO2 readings.

8. Undesirable side effects:

Side effects or adverse reactions are none known to date.

9. Substantial equivalence

Predicate legally marketed devices

Readmyheart (Model RMH 3.0) K050620 HRV module (checkmyheart) Applicant: DailyCare BioMedical Inc.

Pulse Oximeter MD 300 1, K072825 Applicant: Beijing Choice Electronic Technology Co., Ltd. Mc Pulse Photoelectric Plethysmograph K023238 Applicant: Meridian Co., Ltd.

Similarities:

Substantial equivalence

For each module of the ES Teck

  • Same intended use
  • Same technological characteristics as the predicate devices
  • Same safety and effectiveness

Differences:

  • The entire intended uses of the ES Teck represent the intended uses of 3 predicate devices : the Combination devices does not affect the Class (II) of the device and the classification panel should be Cardiology/Anesthesiology
  • The power is supplied from the USB port of the PC
  • No LCD display, results in the PC monitor. >
  • The transmission of the data's are from the USB port of the PC
  • The ES Teck HRV module does not be tested for the 60601-2-47, because the device is not ambulatory.
  • The intended use of the ES Teck HRV module is out of the scope of the 60601-2-25 and 60601-2-51.

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The Predicate legally marketed device Readmyheart is also a combination of devices including ECG and HRV module (Checkmyheart. i.e.IFU about the device). The IEC/ 60601-2-25 and IEC/ 60601-2-51 tests have been made for the ECG module and not for the HRV module. I.e. Tables of comparison of the ES Teck modules and SE discussion: i.e. Executive summary

11. Performances and Effectiveness

HRV module:

    1. Tests with input data from the MIT-BIH database
    1. Calibration tests (simulator)
    1. Software verification (SRS/SDS/STD/STR)
  1. Peer review reference (Task Force of The European Society of Cardiology and The North American Society. European Heart Journal (1996) 17, 354-381)

Discussion of Clinical Test performed for the HRV module:

Since the HRV parameters algorithm and hardware are exactly the same as in the predicate device, The HRV module of ES Teck do not required clinical tests.

Instead, we conducted a simulator and MIT database comparison study for the function of heartbeat detection. Furthermore, HRV is only the mathematical analysis of heart beat has not been approved by FDA for a specific clinical diagnosis in any devices, so that is for reference only, therefore, no clinical validation is required for HRV module.

SpO2 module: (OEM contract)

    1. Clinical tests of the OEM subcontractor
    1. Calibration tests of the oximeter (simulator)
    1. Software verification (SRS/SDS/STD/STR)
    1. The OEM subcontractor provided the oximeter, sensor, cable connections and software code source and they were cleared for use together.

Photoelectrical Plethysmography application

    1. Peer reviews algorithms and published clinical investigations
    1. Software verification (SRS/SDS/STD/STR)

Discussion of Clinical Test performed for the Photoelectrical Plethysmography application: Since the Photoelectrical plethysmography (PP) algorithms and hardware design are exactly the same as in the predicate device, The PP application of ES Teck do not required clinical tests. Furthermore, the PP application is only the mathematical analysis of Pulse wave of the oximetry, and has not been approved by FDA for a specific clinical diagnosis in any devices, so that is for reference only, therefore, no clinical validation is required for PP application.

Use of the published clinical investigations of the PP application:

For interpretation of the results we use some published clinical investigations. These clinical investigations had been made with materials using the same technology (Pulse oximeter) and the same anatomical site (fingertip).

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Ko83229

The facts:

  • To use a combination devices >
  • To use unique software for analysis

  • To use the USB connection for the power supply and the data transmission
  • To display the results in the PC monitor and not in LCD
  • √ No ambulatory device

Do not affect the performances and the effectiveness of the ES Teck system.

12. General Safety Concerns

The facts:

  • To use a combination devices
  • To use unique software for analysis
  • To use the USB connection for the power supply and the data transmission
  • To display the results in the PC monitor and not in LCD
  • √ No ambulatory device

Do not change the general safety to the legally marketed predicate devices as shown the laboratory tests reports. (IEC 60601-1-2 and IEC 60601-1-1)

13. Standards

AAMI EC53:1995 (R) 2001 reaffirmed 11 May 2001 ECG cables and leadwires AAMI EC57-1998(R) 2003 Testing and Reporting Performance Results of Cardiac Rhythm and ST-Segment Measurement Algorithms

ANSI/AAMI EC12:2000/(R) 2005 Disposable ECG electrodes

IEC60601-1-1 Issued: 2000/12/14 Ed:2 Part 1-1: General requirements for safety -

Collateral standard: Safety requirements for medical electrical systems

IEC 60601-1-2 Issued: 2001/09/30 Ed: 2 Medical Electrical Equipment Part 1-2: General Requirements for Safety Collateral Standard: Electromagnetic Compatibility - Req. and Tests - Including Section 6 manual review

ISO9919 (From OEM subcontractor) Issued: 2005/03/15 Ed:2 Medical electrical equipment Particular requirements for the basic safety and essential performance of pulse oximeter equipment for medical use

Conclusions

E.S Teck is a combination devices and equivalent in performances, technology, safety and efficacy to the legally marketed predicate devices

Signature:

Albert MAAREK

Premarket notification {510K} Number: K083229

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DEPARTMENT OF HEALTH & HUMAN SERVICES

Image /page/6/Picture/1 description: The image shows the logo for the U.S. Department of Health and Human Services. The logo is circular and contains the words "DEPARTMENT OF HEALTH & HUMAN SERVICES • USA" around the perimeter. In the center of the circle is an abstract symbol that resembles an eagle or other bird.

Public Health Service

Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850

LD Technology, LLC c/o Dr. Richard Clement, M.D. 11459 NW 34 Street Miami, FL 33178

FEB 2 3 2009

Re: K083229

Trade/Device Name: Electro Sensor Teck Model PEMS 1 Regulation Number: 21 CFR 870.2300 Regulation Name: Patient Physiological Monitor (without arrhythmia detection or alarms) Regulatory Class: Class II Product Codes: MWI, DPS, DQA, JOM Dated: February 4, 2008 Received: February 18, 2008

Dear Dr. Clement:

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.

If your device is classified (see above) into either class II (Special Controls) or class III (PMA), it may be subject to such additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 898. In addition, FDA may publish further announcements concerning your device in the Federal Register.

Please be advised that FDA's issuance of a substantial equivalence determination does not mean that FDA has made a determination that your device complies with other requirements of the Act or any Federal statutes and regulations administered by other Federal agencies. You must comply with all the Act's requirements, including, but not limited to: registration and listing (21 CFR Part 807); labeling (21 CFR Part 801); good manufacturing practice requirements as set

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Page 2 - LD Technology, LLC c/o Dr. Richard Clement, M.D.

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. This letter will allow you to begin marketing your device as described in your Section 510(k) premarket notification. The FDA finding of substantial equivalence of your device to a legally marketed predicate device results in a classification for your device and thus, permits your device to proceed to the market.

If you desire specific advice for your device on our labeling regulation (21 CFR Part 801), please contact the Center for Devices and Radiological Health's (CDRH's) Office of Compliance at (240) 276-0120. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21CFR Part 807.97). For questions regarding postmarket surveillance. please contact CDRH's Office of Surveillance and Biometric's (OSB's) Division of Postmarket Surveillance at 240-276-3474. For questions regarding of device adverse events (Medical Device Reporting (MDR)), please contact the Division of Surveillance Systems at 240-276-3464. You may obtain other general information on your responsibilities under the Act from the Division of Small Manufacturers, International and Consumer Assistance at its toll-free number (800) 638-2041 or (240) 276-3150 or at its Internet address http://www.fda.gov/cdrh/industry/support/index.html.

Sincerely yours.

Dna R. bochner

A Bram D. Zuckerman, M.D. Director Division of Cardiovascular Devices Office of Device Evaluation Center for Devices and Radiological Health

Enclosure

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Indication for Use

510(k) Number: K083229

Device Name: E.S Teck (Electro Sensor Teck)

Indication For Use:

Each module has specific feature and intended use

    1. Pulse Oximeter:
    • To spot check or monitor Oxygen saturation of arterial hemoglobin (SpO2%) and . pulse rate.
    • To analyze the pulse waveform (Photoelectrical Plethysmography or PP) provided . by the oximeter. It only provides mathematical analyses of the input of the SpO2 measurement.
    1. Heart rate variability (HRV) :
  • To analyze the basic rhythms of the NN or RR intervals in heart rate, both in the . time domain and in the frequency domain (short time 5 minutes). It only provides mathematical analyses of the input of the heart rate variability.

The mathematical analysis of Photoelectrical Plethysmography and HRV are not intended use for diagnosis.

The software provides a visual alarm for the values of the heart rate and/or SpO2 percent out of the normal range and for the bad quality signal transmission.

The data are stored in PC in the Backup system of the ES Teck software.

The device is intended use only for adult subjects (> 20 years old)

This Oximeter is intended to be used in spot-checking (2 minutes)

The device is intended use in licensed practitioner's office

This device is no intended to be used at home, in hospital or out-of-hospital transport The device is not intended use in support life and not for continuously monitoring The system will be use by licensed practitioner.

Prescription Use V (21 CFR Part 801 Subpart D)

And/Or

Over the Counter Use (21 CFR Part 801 Subpart C)

(PLEASE DO NOT WRITE BELOW THIS LINE; CONTINUE ON ANOTHER PAGE IF NEEDED)

Concurrence of CDRH, Office of In Vitro Diagnostic Device Evaluation and Safety (OVD)

Dina Z. Vclums

Division Sign-Off Office of In Vitro Diagnostic Device Evaluation and Safety

K083279 510(k)

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§ 870.2300 Cardiac monitor (including cardiotachometer and rate alarm).

(a)
Identification. A cardiac monitor (including cardiotachometer and rate alarm) is a device used to measure the heart rate from an analog signal produced by an electrocardiograph, vectorcardiograph, or blood pressure monitor. This device may sound an alarm when the heart rate falls outside preset upper and lower limits.(b)
Classification. Class II (performance standards).