Cardiovascular monitoring device
Portable physiological measuring devices and methods are disclosed. Embodiments may provide measurement of blood pressure without traditional blood pressure cuffs. Further, disclosed embodiments may gather pulse oximetry (SpO2), heart rate and body temperature measurements simultaneously. A user's blood pressure index and other vital physiological results may be displayed on a portable physiological measuring apparatus or a portable terminal. Embodiments may provide a portable physiological measuring method and apparatus that displays results on a displayed screen.
1. A method of measuring a blood pressure value of a user, the method comprising:
placing a first thumb of the user in an indented portion near one end of a top surface of a handheld physiological measuring apparatus, wherein the indented portion is formed from an electroconductive material that acts as a first electrode, and the indented portion includes at least one sensor located inside the first electrode at a bottom of the indented portion;
placing a second thumb of the user on the top surface of the handheld physiological measuring apparatus, away from the indented portion, wherein the top surface is made of the electroconductive material that acts as a second electrode of the handheld physiological monitoring device; wherein the first electrode is electrically isolated from the second electrode by an insulating spacer;
measuring an electrocardiogram signal using an electrocardiogram circuit unit including the first electrode and the second electrode;
measuring a dual pulse wave signal using a pulse circuit unit of the handheld physiological measuring apparatus, wherein the pulse circuit unit is positioned at a same location on the handheld physiological measuring apparatus as the second electrode;
calculating a pulse transit time using the electrocardiogram signal and the dual pulse wave signal;
calculating a pulse wave velocity using the electrocardiogram signal and the dual pulse wave signal;
calculating the blood pressure value using the calculated pulse transit time and the calculated pulse wave velocity; and
outputting the calculated blood pressure value to the user.
2. The method of claim 1 , further comprising calculating an SpO2 value using the dual pulse wave signal.
3. The method of claim 1 , further comprising calculating a heart rate value using an R-R interval of the electrocardiogram signal.
4. The method of claim 1 , wherein calculating the pulse transit time comprises computing a difference in time between a peak of the electrocardiogram signal and a maximum slope point of the pulse wave signal.
5. The method of claim 1 , wherein the pulse wave velocity is calculated using the pulse transit time and a length of a blood vessel of the user corresponding to a distance from a heart of the user to a point where the pulse wave signal is measured.
6. The method of claim 5 , wherein the length of the blood vessel is calculated using a regression equation.
7. The method of claim 5 , wherein the length of the blood vessel is calculated using a movement and rotation sensor.
8. The method of claim 1 , further comprising calculating an SpO2 value using the dual pulse wave signal.
9. The method of claim 1 , further comprising calculating a heart rate value using at least one of the electrocardiogram signal or the dual pulse wave signal.
10. The method of claim 1 , wherein the at least one sensor comprises a motion sensor, the method further comprising:
sensing a movement of the portable physiological measuring apparatus, using the motion sensor; and
measuring the electrocardiogram signal and the dual pulse wave signal responsive to determining that the movement is less than a threshold value.
11. The method of claim 10 , further comprising stopping measuring the electrocardiogram signal and dual pulse wave signal responsive to determining that the movement is greater than or equal to a threshold value.
12. The method of claim 10 , wherein the motion sensor is selected from the group consisting of an accelerometer, a gyroscope, a shock sensor, a tilt sensor, an altimeter, a gravity sensor, and a terrestrial magnetism sensor.
13. The method of claim 1 , wherein the at least one sensor is selected from the group consisting of a thermal sensor, a photo sensor, a dual photo sensor, an SpO2 sensor, and an optical sensor, and wherein the method further comprises sensing at least one parameter using the at least one sensor.