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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)(More)
Flow rate monitoring provides an indication for early intervention of vascular graft degradation or failure used in lower limb bypasses and renal haemodialysis. This paper presents an inductively powered implantable blood flow sensing microsystem with bidirectional telemetry capability, which fully integrates the silicon nanowire (SiNW) sensor with tunable(More)
This paper describes a closed loop wireless inductive power transfer system for an implantable brain machine interface. The proposed system is designed to ensure optimal power transfer by an off-body unit, battery powered, to an in-body implanted unit while guarantying a minimum transmitted power level for proper operation and a maximum level to avoid brain(More)
Wireless powering to implantable biomedical devices is highly desirable due to obviation of batteries or piercing wirings. This paper presents an implantable inductively powered front-end operating at 13.56MHz carrier frequency for biomedical applications, with the capabilities of power transfer, clock extraction and bidirectional command/data(More)
To avoid or minimize postimplantation injury as a result of brain micromotion relative to the skull, a flexible multichannel polyimide (PI) cable was designed and microfabricated for data and power transmission between an intracranial IC recording from a neural probe array and an extracranial IC exchanging power and data wirelessly with an external unit.(More)
— High efficiency is vital for wireless powering link in biomedical implant application. This paper presents the analysis of the overall efficiency from the viewpoint of whole link and two important factors are elaborated. First, the choice of the optimal power carrier frequency should be tradeoff through the whole link, especially with consideration of(More)
This paper presents design of wirelessly powered coils for implantable micro-system for blood flow sensing, and a technique of optimal resonant load transformation. Basics and calculations are also introduced for the wireless powering structure to achieve optimal power transfer efficiency. Measurement results show that the implemented wirelessly powered(More)
Integral equation method is used to compute three-dimension-structure capacitance in this paper. Since some multi-conductor structures present regular periodic property , the periodic cell is adopted to reduce the solution domain with adding appropriate magnetic and electric walls. The periodic Green's function in the integral equation method is represented(More)
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