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In this paper, two examples of wireless sensor microsystems for medical devices are presented: a wireless blood flow monitoring microsystem which is fully integrated with a prosthetic vascular graft for early failure detection, and a 100-channel wireless neural recording microsystem In the context of such biomedical applications, high-efficiency wireless transceiver circuit techniques for data communication...
This paper presents the design of a BJT-based remote temperature sensor to measure ambient temperature in different locations. The sensor chip supplies a calibrated current to the external devices, which are common off-the-shelf bipolar junction transistors — 2N3904 (NPN) and 2N3906 (PNP), and converts their base-emitter voltages to temperature using a 13-bit charge-balancing ΣΔ modulator. Dynamic...
This paper presents an implantable blood flow monitoring microsystem embedded in a prosthetic graft for early graft failure detection. The microsystem consists of two MEMS pressure sensors, an inductively powered wireless sensor interface ASIC, two miniature coupling coils, and a flexible cable connecting them. The implantable microsystem is powered and configured by an external monitoring device...
Monitoring blood flow rate inside prosthetic vascular grafts enables an early detection of the graft degradation, followed by the timely intervention and prevention of the graft failure. This paper presents an inductively powered implantable blood flow sensor microsystem with bidirectional telemetry. The microsystem integrates silicon nanowire (SiNW) sensors with tunable piezoresistivity, an ultralow-power...
In this paper, a tactile sensor ASIC for a sensorized guidewire in minimally invasive surgical operations is presented. This ASIC interfaces with Silicon Nanowire (SiNW) sensors, which capture the force exerted at the tip of the guidewire and present it as a resistance value. The resistance is then converted to current pulses in the ASIC. These pulses are transmitted and displayed on an external monitoring...
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