ABSTRACTWithin the last few decades medical electronics has rapidly developed and become an important part of medical research, clinical medicine and surgery. The present paper surveys the developments in medical electronics. Taking the measurement of physiological parameter aspect the design criteria for electronic circuits to meet biological requirements have been described with particular reference to the electromagnetic blood flowmeter. The necessity of correlation between biological factors and adaptation of conventional electronic techniques has been stressed. The possibility of construction of these equipment in India in terms of the components available has also been discussed.