Patent ID: 6246902
Filing Date: 2001-06-12
Classification: A61B,Y10S

Abstract:
An apparatus for coupling physiological signals acquired from a patient to a physiological signal processing circuit in a patient monitor, in the presence of an interference signal acquired by the apparatus, said apparatus comprising:a first signal conductor having an input end adapted for coupling to a physiological signal sensor coupled to a medical patient for acquiring a physiological signal, and having an output end adapted for coupling the physiological signal to a physiological signal input of a physiological signal processing circuit in a patient monitor;a second signal conductor positioned for shielding the first signal conductor from the input end to the output end, the second signal conductor having an output end adapted for coupling to a reference point associated with the physiological signal processing circuit of the patient monitor; anda first inductance connected in series with the second signal conductor for forming a filter circuit which attenuates the level of the interference signal in the second signal conductor, wherein there is no series coupled inductance in the first conductor corresponding to the first inductance in the second conductor.