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        Tips and Guidelines for Buying an Electromagnetic Blood Flow Detector

        Electromagnetic blood flowmeters used in vascular reconstructive surgery to confirm and measure velocity of blood flow in vessels. This invasive technique involves use of a catheter inserted into vessel, or use of probe surrounding a surgically exposed vessel, so as not to penetrate the vessel wall.

        Tips for Buying an Electromagnetic Blood Flow Detector

        1. Laser blood flow meters and blood-flow detectors can be handheld, portable, or tabletop units. Facilities should select the right configuration based on clinician monitoring needs and preference.

        2. Blood-flow detectors and meters should include an on/off indicator, and transducers with different user-selectable transmitting frequencies. The detectors and flow meters should have a range of 2 to 8 MHz.

        3. External speakers with volume control for Doppler analysis should be included with the flow meters. They should also have bi-directional flow indicators, and a transducer mounted on a catheter or probe or integral to a clamp.

        4. Flow meters should have probes with different lumen diameters. Frequency response should be user-selectable and within a range of 0.5 to 100 Hz.

        5. A flow meter should remain zeroed and calibrated for at least one day after it was zeroed and calibrated according to the manufacturer's instructions.

        6. In order to provide the required accuracy for the evaluation of blood perfusion, the units should include a fiber optic probe designed for that purpose.

        7. The following data should be specified by the manufacturer: the unit's measurement depth, response time, laser class, wavelength, and power output at probe tip, Doppler-shift frequency range, cable length, and probe-head diameter.

        8. When facilities consider buying probes to be used with blood flow meters, they should look into various factors, such as: the length of the vessel that can be exposed, the available space around the vessel, the location of adjacent organs, and the depth of the vessel's location.

        9. Facilities must use probes of the right size and type to obtain accurate results. Most manufacturers will try to meet specific needs for probe sizes and accessories, although they don't necessarily include it in their usual product lines.

        10. Various output options are offered with these units. These may include headphones, chart recorder, extra output jacks, a printer, and meters.

        11. Other options are available as well, including pneumoplethysmography, strain-gauge plethysmography, photoplethysmography, a carrying case, a remote control, a footswitch, and interfacing capabilities.

        12. The units can be line-powered or battery-powered. Battery-powered units should have their battery operating the device for at least two hours. A visible and audible alarm should warn when a battery level falls to the point that may fail to perform satisfactorily.

        13. Rechargeable batteries should require less than 16 hours of recharging after depletion When there's a need to recharge the battery, a clear indicator should appear.

        Questions for the Seller

        Before you purchase your Electromagnetic Blood Flow Detector, we recommend you ask the seller
        the following questions:
        General Information

        • Is it bidirectional?
        • Does it have computer interface?
        • Does it have volume control?
        • Does it have an on/off indicator?
        • Can it be battery operated?

        Outputs

        • Does it include a speaker?
        • Does it include a headphone?
        • Does it include a chart recorder?
        • Does it include a printer? 

        Tips and Guidelines for Buying an Electromagnetic Blood Flow Detector

        Electromagnetic blood flowmeters used in vascular reconstructive surgery to confirm and measure velocity of blood flow in vessels. This invasive technique involves use of a catheter inserted into vessel, or use of probe surrounding a surgically exposed vessel, so as not to penetrate the vessel wall.

        Tips for Buying an Electromagnetic Blood Flow Detector

        1. Laser blood flow meters and blood-flow detectors can be handheld, portable, or tabletop units. Facilities should select the right configuration based on clinician monitoring needs and preference.

        2. Blood-flow detectors and meters should include an on/off indicator, and transducers with different user-selectable transmitting frequencies. The detectors and flow meters should have a range of 2 to 8 MHz.

        3. External speakers with volume control for Doppler analysis should be included with the flow meters. They should also have bi-directional flow indicators, and a transducer mounted on a catheter or probe or integral to a clamp.

        4. Flow meters should have probes with different lumen diameters. Frequency response should be user-selectable and within a range of 0.5 to 100 Hz.

        5. A flow meter should remain zeroed and calibrated for at least one day after it was zeroed and calibrated according to the manufacturer's instructions.

        6. In order to provide the required accuracy for the evaluation of blood perfusion, the units should include a fiber optic probe designed for that purpose.

        7. The following data should be specified by the manufacturer: the unit's measurement depth, response time, laser class, wavelength, and power output at probe tip, Doppler-shift frequency range, cable length, and probe-head diameter.

        8. When facilities consider buying probes to be used with blood flow meters, they should look into various factors, such as: the length of the vessel that can be exposed, the available space around the vessel, the location of adjacent organs, and the depth of the vessel's location.

        9. Facilities must use probes of the right size and type to obtain accurate results. Most manufacturers will try to meet specific needs for probe sizes and accessories, although they don't necessarily include it in their usual product lines.

        10. Various output options are offered with these units. These may include headphones, chart recorder, extra output jacks, a printer, and meters.

        11. Other options are available as well, including pneumoplethysmography, strain-gauge plethysmography, photoplethysmography, a carrying case, a remote control, a footswitch, and interfacing capabilities.

        12. The units can be line-powered or battery-powered. Battery-powered units should have their battery operating the device for at least two hours. A visible and audible alarm should warn when a battery level falls to the point that may fail to perform satisfactorily.

        13. Rechargeable batteries should require less than 16 hours of recharging after depletion When there's a need to recharge the battery, a clear indicator should appear.

        Questions for the Seller

        Before you purchase your Electromagnetic Blood Flow Detector, we recommend you ask the seller
        the following questions:
        General Information

        • Is it bidirectional?
        • Does it have computer interface?
        • Does it have volume control?
        • Does it have an on/off indicator?
        • Can it be battery operated?

        Outputs

        • Does it include a speaker?
        • Does it include a headphone?
        • Does it include a chart recorder?
        • Does it include a printer? 
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