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                <term xml:lang="en">Near Field Resonant Inductive coupling</term>
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              <p>Our research aims to enhance smart orthopedic knee implants used in Total Knee Arthroplasty (TKA). With the projected quadrupling of TKA demand by 2030 due to factors like aging populations, rising obesity rates, and broader indications for younger patients, our focus is on instrumented medical implants to measure knee parameters. In this paper, we report the optimization of a wireless power transmission system for powering smart knee implants, employing an established HF Near-field Resonant Inductive Coupling (NRIC) technique at 13.56MHz inside the stem of a tibial knee implant. We propose a pragmatic optimization approach in this study, guided by the integration constraints of a knee implant and validated by orthopedic surgeons through cadaveric specimen testing. Finite Element simulations guided the selection of a frontal 3-turn solenoid (called “paperclip” coil) at the Rx side, located at the tip of the stem, which demonstrated balanced performance metrics and reasonable volume occupancy (1.6 cm 3 ). Power transfer measurements were conducted through conductive solutions mimicking skin, muscle, and bones. At 13.56MHz , a power transfer efficiency η of 30% and 7.5% ( 300mW and 75mW at 1W input power) was achieved at Tx-Rx distances of 25mm and 40mm respectively. The proposed solution was implanted in a cadaveric specimen : 250mW was obtained at an estimated 30mm distance for an input power of 1W at the Tx side. For the same distance, we also performed a successful DC power provision up to 64mW at 3V DC and data transfer functions at 26kbits−1 in the cadaver. The proposed system, with its integration strategy, holds promise in powering advanced sensor functions, contribu...</p>
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