Frequently Asked Questions (FAQ)To determine the 'unstreched' volume of the finger arteries, which is the proper level of arterial clamping; the Physiocal method is used (introduced by K. Wesseling et al in 1995). Physiocal is short for physiological calibration. During a Physiocal, finger cuff pressure is kept at constant levels for one or more heart beats, to observe the physiological properties of the finger artery by which the appropriate unstreched arterial volume can be determined
Nexfin is intended for monitoring adult patients with finger circumference between 37 and 71 mm. However, there are publications of Nexfin measurements performed on children
Click here to see what parameters can be displayed by Nexfin. And here to see parameters available in ccNexfin.
The main difference is that ccNexfin includes the Masimo SET® Rainbow technology for the measurement of non-invasive Oxygen Saturation (SpO2) and Hemoglobin (SpHb), while Nexfin doesn’t. Therefore, in combination with BMEYE’s Cardiac Output, ccNexfin can display real-time and continuous Oxygen Deliver (DO2). In addition, ccNexfin includes novel algorithms for the calculation of Fluid Responsiveness parameters (PPV and SVV), making an ideal monitor for Anesthesia, Emergency Care and Intensive Care. Finally, the option to measure ECG is only available in Nexfin.
BMEYE monitors use pulse contour as method for estimation of beat‐to‐beat Stroke Volume which was first described as the classic two‐element Windkessel model in 1899. Pulse contour algorithms for Continuous Cardiac Output (CCO) were initially developed by Wesseling and coworkers, who described the corrected characteristic impedance or cZ method in 1983, and the Modelflow method in 1993.
BMEYE has refined these methods and introduced the Nexfin CO‐Trek™ algorithm in 2007, which computes beat‐to‐beat stroke volume using an updated pulse contour method. The Nexfin CO‐Trek ™ integrates the systolic pressure‐time integral similar to the cZ method, but in doing so it uses the reconstructed brachial arterial pressure waveform as a close substitute for aortic pressure. In addition, it uses age, gender, height and weight for individualizing the components of the three element Windkessel afterload, which can then be used for any arterial pressure level and for stroke volume computation
No. Current models do not have networking capabilities
BMEYE monitors use a single finger sensor (called finger cuff) wrapped around a patient's finger, to measure non-invasively and continuously the finger arterial blood pressure (BP).
The BP measurement is based on:
The volume clamp was originally introduced by the Czech physiologist J.Peñáz in 1967. Changes in finger arterial volume are continuously monitored with a photo plethysmograph (a combination of a light source and a light receiver) which is built-in in the finger cuff. Finger arterial blood volume is kept at a constant level, by using the signal from the photo plethysmograph to rapidly adapt pressure in an air bladder in the sensor. If the artery is clamped at its 'unstreched' volume the pressure in the finger cuff equals the finger arterial pressure at all times during every heartbeat.
 No. Our monitors are currently not equipped with alarms. Therefore, monitors are for supervised monitoring only
BMEYE has two products approved for sale in the U.S. and Europe from this platform: Nexfin, for the Cardiology market, and ccNexfin, for the Anesthesia, Emergency and Intensive Care markets
Yes. Both monitors include a Heart Reference System (HRS) which enables patients to move their hands freely during measrument. However, strong shaking of the finger or arm should be avoided
Yes. This feature can be enabled in all BMEYE monitors.
On average, reliable data can be obtained within two minutes of initiating a measurement
No. In contrast with other technologies, any healthcare professional in a clinical and research setting can easily perform measurements with BMEYE monitors. Basic training is required mainly on sensor application
Yes. Nexfin is CE-marked and FDA cleared since 2007. ccNexfin is CE-marked since 2009 and FDA cleared since 2010. Moreover, BMEYE already markets its products in several countries outside Europe and the USA
Yes. BMEYE's technology has been extensively validated throughout the last 30 years. For a list of clinical studies involving our breakthrough technology, click here.
In patients with extreme contraction of the smooth muscle in the arteries and arterioles in the lower arm and hand, such as may be present in patients with Raynaud's disease. In these patient groups blood pressure measurement may become impossible
Our technology measures at the finger artery. Therefore, it needs blood flow in the finger. In shock, blood flow to the finger can be minimal and thus pressure cannot be measured. However, BMEYE's continuous technology allows for early detection of hemodynamic instability moments before a patient goes into shock
BMEYE has vast and solid network of distributors covering North America and Europe, as well as other countries in Asia and the Middle East. Find a distributor near you on by clicking in the Find a distributor button. If there is no local distributor in your region, please contact BMEYE directly (Contact us)
Yes. BMEYE monitor has I/O connector on the right side of the monitor, featuring analog inputs and outputs. The blood pressure waveform (BP) is always available as analog output signal. An analog output cable can be used to connect the monitor to the external system. If you want to output more or other Nexfin signals, an analog output module is optionally available, consisting of a software update and an analog output box. If you want to import signals into Nexfin and store these signals together with the Nexfin data, an analog input/output module is available, consisting of a software update and an analog input/output box
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