Jens Muehlsteff,Robert Pinter,Geert Guy Georges Morren
申请号：
US12990806
公开号：
US08870785B2
申请日:
2009.05.04
申请国别(地区):
US
年份:
2014
代理人:
摘要：
Respiration of a patient is detected by emitting an electromagnetic signal towards the patient receiving a reflected electromagnetic signal reflected from the patient converting the reflected electromagnetic signal, yielding a first signal phase-shifting the reflected electromagnetic signal and converting the phase-shifted reflected electromagnetic signal, yielding a second signal determining a first vector being defined by the time derivatives of the first signal and the second signal, for a common first point in time determining a second vector being defined by the time derivatives of the first signal and the second signal, for a common second point in time and calculating the scalar product of the normalized first vector and the normalized second vector as an indicator value for a change from expiration to inspiration of the patient or vice versa. A change from expiration to inspiration of the patient or vice versa is preferably indicated if the indicator value is below a threshold value, preferably below a value of 0. In this way, respiration is monitored contactlessly and remotely based on the Doppler radar principle which is reliable and easy to handle.
