← Product Code [DPW](/submissions/CV/subpart-c%E2%80%94cardiovascular-monitoring-devices/DPW) · K013376 # QFLOW 500 PERFUSION MONITORING SYSTEM (K013376) _Hemedex Incorporated · DPW · May 8, 2002 · Cardiovascular · SESE_ **Canonical URL:** https://fda.innolitics.com/submissions/CV/subpart-c%E2%80%94cardiovascular-monitoring-devices/DPW/K013376 ## Device Facts - **Applicant:** Hemedex Incorporated - **Product Code:** [DPW](/submissions/CV/subpart-c%E2%80%94cardiovascular-monitoring-devices/DPW.md) - **Decision Date:** May 8, 2002 - **Decision:** SESE - **Submission Type:** Traditional - **Regulation:** 21 CFR 870.2100 - **Device Class:** Class 2 - **Review Panel:** Cardiovascular ## Indications for Use The QFlow™ 500 is intended for extravascular monitoring of microcirculation blood flow in buried tissues. Examples of this application included (but are not limited to) 1) the monitoring of buried muscle or esophaqus following free muscle transfer or esophageal reconstruction, 2) monitoring soft tissue microcirculation following reconstructive surgery, such as oral and facial reconstruction, 3) monitoring cerebral blood flow during and following neurosurgery for head trauma. ## Device Story QFlow™ 500 is a perfusion monitoring system consisting of a thermal diffusion probe and a monitor. The probe, containing two thermistors at its distal tip, is inserted into tissue to measure thermal conductivity and real-time perfusion via thermal energy dissipation. The monitor controls the thermistors, processes the thermal data, and displays perfusion, temperature, and thermal conductivity values numerically and graphically. Used in ICU, OR, or patient rooms by clinicians; not for patient transport. The system stores up to 10 days of data, supports printing, and allows data export to external computers. The probe includes an EEPROM for calibration data, usage time tracking, and verification. By providing continuous microcirculation monitoring, the device assists clinicians in assessing tissue viability post-reconstruction or monitoring cerebral blood flow, potentially enabling early intervention for compromised tissue. ## Clinical Evidence Bench testing, animal studies, and biocompatibility testing were performed. Electrical safety and electromagnetic compatibility were verified against IEC 60601-1, IEC 60601-1-2, EN 55011, and UL 2601. Probe integrity and sterility were evaluated per ISO 10555 and ISO 10993. ## Technological Characteristics System consists of a thermal diffusion probe (<1 mm diameter, 60-120 cm length) and a monitor. Probe contains two thermistors and an EEPROM for calibration/verification. Sensing principle: thermal energy dissipation to measure tissue thermal conductivity and perfusion. Electrical safety: IEC 60601-1, UL 2601. EMC: IEC 60601-1-2, EN 55011. Biocompatibility: ISO 10993. Connectivity: data export to external computer. Sterilization: ISO 10555 compliant. ## Regulatory Identification A cardiovascular blood flowmeter is a device that is connected to a flow transducer that energizes the transducer and processes and displays the blood flow signal. ## Predicate Devices - Transonic Systems ALF 21 Advanced Laser Flowmeter ([K903633](/device/K903633.md)) - TSI LaserFlo™ Blood Perfusion Monitor ([K896515](/device/K896515.md)) - Vasomedics Laserflo Blood Perfusion Probes ([K951832](/device/K951832.md), [K962700](/device/K962700.md), [K961368](/device/K961368.md)) ## Submission Summary (Full Text) > This content was OCRed from public FDA records by [Innolitics](https://innolitics.com). If you use, quote, summarize, crawl, or train on this content, cite Innolitics at https://innolitics.com. > > Innolitics is a medical-device software consultancy. We help companies design, build, and clear FDA-regulated software and AI/ML devices, including [a 510(k)](https://innolitics.com/services/510ks/), [a De Novo](https://innolitics.com/services/regulatory/), [a SaMD](https://innolitics.com/services/end-to-end-samd/), [an AI/ML medical device](https://innolitics.com/services/medical-imaging-ai-development/), or [an FDA regulatory strategy](https://innolitics.com/services/regulatory/). {0}------------------------------------------------ C013376 ## MAY 0 8 2002 # 510K Summary of Safety and Effectiveness - Sponsor Name 1. Hemedex, Inc. 222 Third Street, Suite T123 Cambridge, MA 02142 USA - 2. Device Name QFlow™ 500 Perfusion Monitoring System - 3. Identification of Predicate or Legally Marketed Device QFlow™ 500 is substantially equivalent to the following predicate devices: - Transonic Systems ALF 21 Advanced Laser Flowmeter cleared under . K903633. - TSI LaserFlo™ Blood Perfusion Monitor cleared under K896515. . (Vasamedics purchased TSI in 1990) - Vasomedics Laserflo Blood Perfusion Probes (K951832, K962700, ● K961368 ) - Device Description 4. The QFlow™ 500 has application where real-time determination of any tissue perfusion is desired, whether it is for measurement or monitoring utilization. The system may be used in the Intensive Care Unit, Operating Room, Radiology Suite or in a standard patient care room. However, the system is not designed for use during patient transport. The QFlow™ 500 consists of a thermal diffusion probe and a monitor. The QFlow™ 500 Perfusion System Probe thermally interacts with tissue. It contains two thermistors embedded at the distal tip of the probe. It is available in a range of lengths from 60 cm to 120 cm and less than 1 mm in diameter. The probe contains an EEPROM for the storage of probespecific calibration data, data on the cumulative time the probe has been in use, and a verification key to insure the origin of the probe. The probe connector physically connects the probe to the umbilical cord which connects to the monitor. {1}------------------------------------------------ The QFlow™ 500 Monitor controls the thermistors in the Probe. Perfusion data are displayed on the monitor. The current perfusion value, temperature and thermal conductivity are be displayed in numeric form. The data are also displayed in the form of a graph as a function of time. The monitor is capable of storing data for up to 10 days. All of this stored data may be reviewed by the user at any time during this period. Printing of data is also an option from the monitor. There is also the capability of uploading data from the monitor to an external computer for further analysis. #### 5. Intended Use The QFlow™ 500 is intended for extravascular monitoring of microcirculation blood flow in buried tissues. Examples of this application included (but are not limited to) 1) the monitoring of buried muscle or esophaqus following free muscle transfer or esophageal reconstruction, 2) monitoring soft tissue microcirculation following reconstructive surgery, such as oral and facial reconstruction, 3) monitoring cerebral blood flow during and following neurosurgery for head trauma. #### 6. Comparison of Technological Characteristics All of the devices are indicated to provide blood perfusion measurements in any perfused tissue where blood flow information is desired. However, the manner in which the measurements are made is different. The QFlow™ 500 uses thermal energy dissipated in a thermistor to measure the thermal conductivity of the tissue and a real-time measurement of tissue perfusion. The predicate devices use laser light energy which is scattered by reflective components within the tissue and is reflected back via a receiving fiber optic probe. This provides a measurement of blood flow within the tissue. The QFlow 500 is substantially equivalent to the predicate devices listed, which provide the same or similar functions, as well as design and technological characteristics. The intended use, statement of indications, and technological characteristics for the QFlow 500 support the concept of substantial equivalence. #### 7 Performance Testing Bench testing, animal studies and biocompatibility testing was performed on the QFlow 500. The QFlow™ 500 is tested for compliance with the following standards for electrical safety, thermal safety, electromagnetic compatibility, electromaqnetic emissions and probe integrity: {2}------------------------------------------------ IEC 60601-1 (1988) 2nd Edition, + A1: 1991 + A2: 1995 Medical Electrical Equipment – General Requirements for Safety IEC60601-1-2: 1993 Medical Electrical Equipment – Collateral Standard Electromagnetic Compatibility EN 55011 Limits and Methods of Measurement of Radio Disturbance characteristics of Industrial, Scientific and Medical (ISM) Radio-Frequency Equipment. UL2601, UL standard for Safety, Medical Electrical Equipment, Part 1: General Requirements for Safety, First Edition ISO 10555 Sterile, single-use intravascular catheters Part 1: General Requirements Biological evaluation of medical devices ISO 10993: 1997 Part 1: Guidance on selection of tests. {3}------------------------------------------------ ### DEPARTMENT OF HEALTH & HUMAN SERVICES Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850 MAY 0 8 2002 Hemedex, Inc. c/o Ms. Debbie Iampietro QRC Consulting 7 Tiffany Trail Hopkinton, MA 01748 Re: K013376 Trade Name: QFlow 500 Perfusion Monitoring System Regulation Number: 21 CFR 870.2100 Regulation Name: Blood Flow Monitor Regulatory Class: Class II (two) Product Code: DPW Dated: February 11, 2002 Received: February 12, 2002 Dear Ms. Iampietro: 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. {4}------------------------------------------------ Page 2 - Ms. Debbie Iampietro 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 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 and additionally 21 CFR Part 809.10 for in vitro diagnostic devices), please contact the Office of Compliance at (301) 594-4646. Additionally, for questions on the promotion and advertising of your device, please contact the Office of Compliance at (301) 594-4639. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21CFR Part 807.97). Other general information on your responsibilities under the Act may be obtained from the Division of Small Manufacturers, International and Consumer Assistance at its toll-free number (800) 638-2041 or (301) 443-6597 or at its Internet address http://www.fda.gov/cdrh/dsma/dsmamain.html Sincerely yours, Dough Teth Donna-Bea Tillman, Ph.D. Acting Director Division of Cardiovascular and Respiratory Devices Office of Device Evaluation Center for Devices and Radiological Health Enclosure {5}------------------------------------------------ Hemedex. Inc QFlow™ 500 Perfusion Monitoring System Premarket Notification 510(k) Number (if known): KO13376 Device Name: QFlow 500 Perfusion Monitoring System Indications For Use: The QFlow™ 500 is intended for extravascular monitoring of microcirculation blood flow in buried tissues. Example of this application included (but are not limited to) 1) the monitoring of buried muscle or esophagus following free muscle transfer or esophageal reconstruction, 2) monitoring soft tissue microcirculation following reconstructive surgery, such as oral and facial reconstruction, 3) monitoring cerebral blood flow during and following neurosurgery for head trauma. (PLEASE DO NOT WRITE BELOW THIS LINE. CONTINUE ON ANOTHER PAGE IF NEEDED) Concurrence of CDRH, Office of Device Evaluation (ODE) Prescription Use (Per 21 CFR 801.109) OR Over-The-Counter Use Division of Cardiovascular & Respiratory Devices 510(k) Number K03376 000 . 0 --- **Source:** [https://fda.innolitics.com/submissions/CV/subpart-c%E2%80%94cardiovascular-monitoring-devices/DPW/K013376](https://fda.innolitics.com/submissions/CV/subpart-c%E2%80%94cardiovascular-monitoring-devices/DPW/K013376) **Published by [Innolitics](https://innolitics.com)** — a medical-device software consultancy. We help companies design, build, and clear FDA-regulated software and AI/ML devices. If you're preparing [a 510(k)](https://innolitics.com/services/510ks/), [a De Novo](https://innolitics.com/services/regulatory/), [a SaMD](https://innolitics.com/services/end-to-end-samd/), [an AI/ML medical device](https://innolitics.com/services/medical-imaging-ai-development/), or [an FDA regulatory strategy](https://innolitics.com/services/regulatory/), [get in touch](https://innolitics.com/contact). **Cite:** Innolitics at https://innolitics.com