BMEYE's monitors connect to the patient by simply wrapping an inflatable cuff around the middle phalanx of the finger. The pulsating finger artery is 'clamped' to a constant volume by applying a varying counter pressure equivalent to the arterial pressure resulting in a pressure waveform (volume clamp method).
Finger arterial pressure is then reconstructed into brachial arterial pressure waveform using a transfer function and a level correction based on a vast clinical database. This is how both Nexfin and ccNexfin provide beat-to-beat continuous Blood Pressure in a totally noninvasive manner, thus without the need for arterial cannulation.
The resulting brachial pressure waveform serves as the basis for determining continuous Cardiac Output (CO). Real-time continuous CO and other hemodynamic parameters are derived by a novel pulse contour method (Nexfin CO-Trek®), which is based on the systolic pressure area and a physiological three-element Windkessel model individualized for each patient.
For a list of clinical studies on our technology, click here.