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Monopolar needle electrode have a coating of which material over the stainless steel wires which are bare only at the tips?(a) carbon(b) calcium(c) sodium(d) teflonThe question was posed to me in a national level competition.My enquiry is from Biosensors topic in portion Physiological Transducers of Biomedical Instrumentation

Answer»

Right option is (d) teflon

To explain: The monopolar needle electrode consists of a teflon coated STAINLESS steel wire. The wire is bare only at the tip. It is FOUND that after the needle has been used a number of TIMES, the teflon coating will recede, INCREASING the tip area. The needle should be discarded when this happens.



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