| 主权项 |
1. A sensor for determining one or more cardiovascular quantities, comprising at least vascular stiffness of a vessel of a living being, the vessel being enclosed by tissue having a skin surface, comprising:
said sensor being adapted for providing at least a first sensor signal indicating capacitance variations between electrodes in that the sensor comprises a first electrode at a first position and a second electrode at a second position with a distance D of at least 3 cm center to center between the first electrode and the second electrode, such that during use lines of flux between the first electrode and the second electrode substantially extend through and cross said vessel, and said sensor comprising a readout circuit having a first connection to the first electrode and a second connection to the second electrode, the readout circuit being configured for recording changes in capacitance between the first electrode and the second electrode, for a determination of a distension of the vessel based on at least said first sensor signal, said sensor being adapted for providing a second sensor signal indicating capacitance variations between electrodes, the sensor comprises
a third electrode provided at a third electrode position adapted to be positioned at a predetermined distance (dppv) along the vessel from said first electrode, such that during use lines of flux substantially extend through and cross the vessel between said second electrode and said third electrode, and said third electrode having a third connection to said readout circuit, the readout circuit being configured for recording changes in capacitance between the third electrode and the second electrode, ora third electrode adapted to be displaced at a predetermined distance (dppv) along the vessel from said first electrode at a third electrode position and a fourth electrode at a fourth electrode position at the predetermined distance (dppv) from said first electrode such that lines of flux between the third electrode and the fourth electrode substantially extend through and cross the vessel, and said third electrode having a third connection to said readout circuit, the readout circuit being configured for recording changes in capacitance between the third electrode and the fourth electrode, wherein the sensor is adapted such that said first and second sensor signals are temporally displaced with a delay (τ), wherein said sensor signals are suitable for performing determination of a pulse propagation velocity (ν) based on a calculation of said predetermined distance (dppv) divided by said delay (τ) between said first sensor signal and said second sensor signal, and wherein said sensor signals further are suitable for determining vascular stiffness based on the performed determination of the pulse propagation velocity (ν). |
