Wireless communicating implant for record of vital diagnosis parameters

This paper describes a functional device prototype validating the concept of a wireless intra-aortic communicating implant measuring and transferring physiological parameters for the monitoring of vascular diseases like hypertension and aneurysms treatment using stent-grafts. The major property required for such an indwelling intra-aortic, thoracic or abdominal station is a long term life cycle adapted to chronic vascular diseases. Proofs of the concept are provided through academic, clinical and industrial collaboration. Geometry, mechanical properties, electronic functions, packaging and efficiency of the communication link have been proven. The implant consists of a biocompatible metallic loop or stent which enables the stabilization in the aortic lumen and provides a dielectric support for the sensor and the electronics needed for data acquisition and transfer, according to wireless communication standards. Coating “by a biocompatible material” is discussed to extend the usability of the device. The metallic structure of the station is proved to be mechanically stable and acts as an antenna. In vitro and in vivo tests in a pig model validate the expected parameters. Moreover, in vivo trials validate the measuring system and the sensor. The electrical tests validate the RF communication with the metallic stent.