Patent ID: 8790261
Filing Date: 2014-07-29
Classification: A61B

Abstract:
1. An apparatus for determining the heart rate of a ferns, comprising: at least one ultrasound transducer operable to generate an ultrasound beam and receive a reflected ultrasound signal, the generated ultrasound beam having a signal strength; a controller coupled to the ultrasound transducer to receive the reflected ultrasound signal and determine the heart rate of the fetus; an excitation voltage generator operable to supply an excitation voltage to the ultrasound transducer; and an excitation voltage adjustment device positioned between the excitation voltage generator and the ultrasound transducer, wherein the excitation voltage adjustment device is operable to modify the excitation voltage supplied to the ultrasound transducer, wherein the signal strength of the ultrasound beam is related to the excitation voltage.