APPARATUS FOR MEASURING A PROPAGATION VELOCITY OF A BLOOD PRESSURE WAVE
First Claim
1. An apparatus for measuring the propagation velocity of a pressure wave in a cardiovascular system, in particular a pressure wave arterial system, said apparatus comprising:
- a first sensor of cutaneous vibrations, which is adapted to be mounted at a first application point of said arterial system for measuring a first cutaneous vibration, said first sensor creating a corresponding first cutaneous vibration signal;
a second sensor of cutaneous vibrations that is adapted to be mounted at a second application point of said arterial system different from said first point for measuring a second cutaneous vibration, said second sensor creating a corresponding second cutaneous vibration signal;
a means for determining the distance between said first and said second application points;
a control unit, said control unit comprising;
a means for detecting said first and said second cutaneous vibration signals as input towards said control unit;
a program means for calculating the propagation velocity of said pressure wave responsive to said distance between said first and said second application points and to said first and second cutaneous vibration signals,wherein said first and second sensors of cutaneous vibrations are adapted to measure vibrations set between 1 Hz and 20 KHz, in particular between 5 Hz and 80 Hz.
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Abstract
An apparatus for measuring the propagation velocity of a pressure wave comprises a first sensor of cutaneous vibration to measure a vibration generated in a first application point, creating a corresponding first signal, and a second sensor of cutaneous vibrations to measure a local cutaneous vibration generated in second point of an arterial vessel, creating a corresponding second signal caused by the deformation of the vessel responsive to the progression of the pressure wave in the vessel. A control unit detects on the first and second signal respectively a first instant time T1 and a second instant time T2 corresponding to a same event of a cardiac cycle. On the basis of T1 and T2 a transit time PTT (Pulse Transit Time) is calculated of the pressure wave and then the propagation velocity is measured of the pressure wave as the ratio between the length of the path arterial.
19 Citations
11 Claims
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1. An apparatus for measuring the propagation velocity of a pressure wave in a cardiovascular system, in particular a pressure wave arterial system, said apparatus comprising:
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a first sensor of cutaneous vibrations, which is adapted to be mounted at a first application point of said arterial system for measuring a first cutaneous vibration, said first sensor creating a corresponding first cutaneous vibration signal; a second sensor of cutaneous vibrations that is adapted to be mounted at a second application point of said arterial system different from said first point for measuring a second cutaneous vibration, said second sensor creating a corresponding second cutaneous vibration signal; a means for determining the distance between said first and said second application points; a control unit, said control unit comprising; a means for detecting said first and said second cutaneous vibration signals as input towards said control unit; a program means for calculating the propagation velocity of said pressure wave responsive to said distance between said first and said second application points and to said first and second cutaneous vibration signals, wherein said first and second sensors of cutaneous vibrations are adapted to measure vibrations set between 1 Hz and 20 KHz, in particular between 5 Hz and 80 Hz. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification