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This paper describes progress toward an active tissue-contrast sensing microsystem that can be embedded at the tip of a fine biopsy needle. An analog CMOS chip is integrated with a piezoelectric sensor to reduce the impact of parasitic capacitances and allow differential sensing that will permit deep tissue sampling. The sensor element and the CMOS circuit are fabricated in-house and integrated onto...
This paper presents the use of an array of piezoceramic microheaters embedded in a biopsy needle for tract cauterization. Circular PZT-5A heaters of 200 ??m diameter and 70-80 ??m thickness are embedded in the wall of a 20-gauge stainless steel needle. Finite element modeling suggests that a PZT array with no gap between the elements to be the most suitable design. The temperature profile generated...
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