NON-INVASIVE CONTINUOUS BLOOD PRESSURE MONITORING SYSTEM AND METHOD

• US 20140081159A1
• Filed: 03/12/2013
• Published: 03/20/2014
• Est. Priority Date: 09/17/2012
• Status: Abandoned Application

• Current Assignee: Holux Technology Incorporated
• Original Assignee: Holux Technology Incorporated
• Inventors: TAO, TEH HO, HU, SHIH JEN, PAN, NENG YU
• Application Number:
  US13/796,899
• Publication Number:
  US 20140081159A1
• Time in Patent Office: Days
• US Class Current: 600/493
• CPC Class Codes: A61B 5/0059 using light, e.g. diagnosis by transillumination, diascopy, fluorescence A61B5/0093, A61B5/1455, A61B5/02416 and A61B5/0261 take precedence
• CPC Class Codes: A61B 5/02125 of pulse wave propagation time
• CPC Class Codes: A61B 5/05 Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves impedance plethysmography A61B5/0295; measuring movement of the entire body or parts thereof A61B5/11; detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof A61B5/24
• CPC Class Codes: A61B 5/1102 Ballistocardiography
• CPC Class Codes: A61B 5/1107 Measuring contraction of parts of the body, e.g. organ, muscle apparatus for measuring work or force in general G01L
• CPC Class Codes: A61B 5/113 occurring during breathing
• CPC Class Codes: A61B 5/725 using specific filters therefor, e.g. Kalman or adaptive filters A61B5/316 take precedence
• CPC Class Codes: A61B 5/7257 using Fourier transforms

Abstract

A non-invasive continuous blood pressure monitoring system includes a first sensor configured to send a first ultra-wideband electromagnetic pulses to an upper site of a blood vessel and receive a first reflected ultra-wideband electromagnetic pulses with phase variations caused by a pressure wave propagating in the blood vessel, a second sensor configured to send a second ultra-wideband electromagnetic pulses to a lower site of the blood vessel and receive a second reflected ultra-wideband electromagnetic pulses with phase variations caused by the pressure wave propagating in the blood vessel, and a signal-processing and blood pressure displaying device configured to calculate an estimated blood pressure by taking into consideration a propagation time of the pressure wave from the upper site to the lower site in the blood vessel.

Claims

1. A non-invasive continuous blood pressure monitoring system, comprising:

a first sensor configured to send a first UWB electromagnetic pulses to an upper site of a blood vessel and receive a first reflected UWB electromagnetic pulses with phase variations caused by a pressure wave propagating in the blood vessel;

a second sensor configured to send a second UWB electromagnetic pulses to a lower site of the blood vessel and receive a second reflected UWB electromagnetic pulses with phase variations caused by the pressure wave propagating in the blood vessel; and

a signal-processing and blood pressure displaying device configured to calculate an estimated blood pressure by taking into consideration a propagation time of the pressure wave from the upper site to the lower site in the blood vessel.

2. The non-invasive continuous blood pressure monitoring system of claim 1, wherein the signal-processing and blood pressure displaying device is configured to calculate the estimated blood pressure by performing a linear calculation.

3. The non-invasive continuous blood pressure monitoring system of claim 1, wherein the signal-processing and blood pressure displaying device is configured to calculate the estimated blood pressure by performing a calculation:

P=Po−

β

×

PWTT

wherein Po and β

are constant, and PWTT represents the propagation time of the pressure wave from the upper site to the lower site in the blood vessel.

4. The non-invasive continuous blood pressure monitoring system of claim 1, wherein the first sensor and the second sensor are positioned on a forearm artery.

5. The non-invasive continuous blood pressure monitoring system of claim 1, wherein the first sensor and the second sensor are positioned on a leg artery.

6. The non-invasive continuous blood pressure monitoring system of claim 1, wherein the first sensor and the second sensor are positioned on the aorta.

7. The non-invasive continuous blood pressure monitoring system of claim 1, wherein the first UWB electromagnetic pulses and the second UWB electromagnetic pulses have a pulse width shorter than 2 nanoseconds.

8. The non-invasive continuous blood pressure monitoring system of claim 1, further comprising a wireless transmission module configured to transmit the first reflected UWB electromagnetic pulses and the second reflected UWB electromagnetic pulses to the signal-processing and blood pressure displaying device.

9. A non-invasive continuous blood pressure monitoring method, comprising steps of:

sending a first UWB electromagnetic pulses to an upper site of a blood vessel and receiving a first reflected UWB electromagnetic pulses with phase variations caused by a pressure wave propagating in the blood vessel;

sending a second UWB electromagnetic pulses to a lower site of the blood vessel and receiving a second reflected UWB electromagnetic pulses with phase variations caused by the pressure wave propagating in the blood vessel; and

calculating an estimated blood pressure by taking into consideration a propagation time of the pressure wave from the upper site to the lower site in the blood vessel.

10. The non-invasive continuous blood pressure monitoring method of claim 9, wherein the calculating of the estimated blood pressure is performed by a linear calculation.

11. The non-invasive continuous blood pressure monitoring method of claim 9, wherein the calculating of the estimated blood pressure is performed by a calculation:

P=Po−

β

×

PWTT

wherein Po and β

are constant, and PWTT represents the propagation time of the pressure wave from the upper site to the lower site in the blood vessel.

12. The non-invasive continuous blood pressure monitoring method of claim 9, wherein the first UWB electromagnetic pulses and the second UWB electromagnetic pulses are sent to a forearm artery.

13. The non-invasive continuous blood pressure monitoring method of claim 9, wherein the first UWB electromagnetic pulses and the second UWB electromagnetic pulses are sent to a leg artery.

14. The non-invasive continuous blood pressure monitoring method of claim 9, wherein the first UWB electromagnetic pulses and the second UWB electromagnetic pulses are sent to the aorta.

15. The non-invasive continuous blood pressure monitoring method of claim 9, wherein the first UWB electromagnetic pulses and the second UWB electromagnetic pulses have a pulse width shorter than 2 nanoseconds.