US 11,779,238 B2
Implantable sensors for vascular monitoring
Fiachra M. Sweeney, Dublin (IE); Hanson S. Gifford, III, Woodside, CA (US); Douglas S. Sutton, Pacifica, CA (US); Brian Wilfley, Sunnyvale, CA (US); Edward McKenna, Sebastapool, CA (US); Xuance Zhou, Newark, CA (US); Peter Callas, Castro Valley, CA (US); and Danyang Fan, Palo Alto, CA (US)
Assigned to Foundry Innovation & Research 1, Ltd., Dublin (IE)
Appl. No. 16/618,304
Filed by Foundry Innovation & Research 1, Ltd., Dublin (IE)
PCT Filed May 31, 2018, PCT No. PCT/EP2018/064386
§ 371(c)(1), (2) Date Nov. 29, 2019,
PCT Pub. No. WO2018/220146, PCT Pub. Date Dec. 6, 2018.
Claims priority of provisional application 62/512,992, filed on May 31, 2017.
Prior Publication US 2020/0129087 A1, Apr. 30, 2020
Int. Cl. A61B 5/0538 (2021.01); A61B 5/107 (2006.01); A61B 5/00 (2006.01)
CPC A61B 5/0538 (2013.01) [A61B 5/1076 (2013.01); A61B 5/6862 (2013.01); A61B 5/6876 (2013.01); A61B 5/6886 (2013.01)] 1 Claim
OG exemplary drawing
 
1. A sensor system for monitoring parameters in a vessel, comprising:
an implantable support structure configured to move with natural movement of the vessel wall;
a plurality of pairs of electrodes coupled to the support structure and configured to be positioned circumferentially spaced around the vessel interior on, in or adjacent a wall of the vessel so as to move with natural movement of the vessel wall when the support structure moves therewith;
a drive circuit configured to provide a drive signal to the electrodes,
measurement circuitry configured to measure at least one of impedance and capacitance between at least two of the plurality of pairs of electrodes; and
a communications circuit configured to wirelessly communicate date from the sensor;
at least one reference electrode maintained at a fixed distance from one of the electrodes, wherein the measurement circuitry is configured to measure at least one of impedance or capacitance between said one of the electrodes and said reference electrode; and
a signal processing circuit in at least one of the implantable sensor and an external console, wherein the signal processing circuit is configured to calculate distance between the electrode pairs based on the measured impedance or the measured capacitance, and wherein the signal processing circuit comprises a processor configured to execute instructions stored in a memory configured to perform one or more steps of:
data correction with parallelogram edge and diagonal correction, by averaging opposed parallelogram sides;
ellipse reconstruction to model a vessel shape, based on chordal lengths using parallelogram side calculations; and
apply a correction to compensate for change from a round to elliptical cross-sectional shape of the vessel.