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Wachs RA, Ellstein D, Drazan J, et al. Elementary Implantable Force Sensor: For Smart Orthopaedic Implants. Adv Biosens Bioelectron. 2013;2(4)
Wachs, R. A., Ellstein, D., Drazan, J., Healey, C. P., Uhl, R. L., Connor, K. A., & Ledet, E. H. (2013). Elementary Implantable Force Sensor: For Smart Orthopaedic Implants. Advances in biosensors and bioelectronics, 2(4), .
Wachs, Rebecca A, et al. "Elementary Implantable Force Sensor: For Smart Orthopaedic Implants." Advances in biosensors and bioelectronics vol. 2,4 (2013).
Wachs RA, Ellstein D, Drazan J, Healey CP, Uhl RL, Connor KA, Ledet EH. Elementary Implantable Force Sensor: For Smart Orthopaedic Implants. Adv Biosens Bioelectron. 2013 Dec;2(4). PMID: 24883335; PMCID: PMC4037930.
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Adv Biosens Bioelectron. 2013 Dec;2(4).

Elementary Implantable Force Sensor: For Smart Orthopaedic Implants.

Advances in biosensors and bioelectronics

Rebecca A Wachs, David Ellstein, John Drazan, Colleen P Healey, Richard L Uhl, Kenneth A Connor, Eric H Ledet

Affiliations

  1. Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, New York, USA.
  2. Department of Electrical, Computer, and Systems Engineering, Rensselaer Polytechnic Institute, Troy, New York, USA.
  3. Division of Orthopaedic Surgery, Albany Medical College, Albany, New York, USA.

PMID: 24883335 PMCID: PMC4037930

Abstract

Implementing implantable sensors which are robust enough to maintain long term functionality inside the body remains a significant challenge. The ideal implantable sensing system is one which is simple and robust; free from batteries, telemetry, and complex electronics. We have developed an elementary implantable sensor for orthopaedic smart implants. The sensor requires no telemetry and no batteries to communicate wirelessly. It has no on-board signal conditioning electronics. The sensor itself has no electrical connections and thus does not require a hermetic package. The sensor is an elementary L-C resonator which can function as a simple force transducer by using a solid dielectric material of known stiffness between two parallel Archimedean coils. The operating characteristics of the sensors are predicted using a simplified, lumped circuit model. We have demonstrated sensor functionality both in air and in saline. Our preliminary data indicate that the sensor can be reasonably well modeled as a lumped circuit to predict its response to loading.

Keywords: Force; Implantable Sensor; Orthopaedic Surgery; Passive Resonator; Pressure

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