SYSTEM AND METHOD FOR MEASURING ARTERIAL PRESSURE BY ITS EFFECTS

• US 20120022383A1
• Filed: 01/12/2010
• Published: 01/26/2012
• Est. Priority Date: 01/12/2010
• Status: Active Grant

• Current Assignee: Jesus Bustillos-Cepeda
• Original Assignee: Jesus Bustillos-Cepeda
• Inventors: Bustillos-Cepeda, Jesus
• Granted Patent: US 10,653,325 B2
• Time in Patent Office: Days
• US Class Current: 600/493
• CPC Class Codes: A61B 5/02208 using the Korotkoff method
• CPC Class Codes: A61B 5/02225 using the oscillometric method

Abstract

The system and method for measuring arterial pressure by its effects consists of a six-stage procedure and three devices; the procedure to indirectly measure diastolic arterial pressure controls the tasks of a first device applying a measured gradual external contact force, a second sensor device of arterial that records arterial expression, and a third device which is a device to measure and detect the arterial cycle diastolic and systolic period in order to provide the diastolic arterial pressure value using an indirect method. Additionally, systolic arterial pressure is measured with no overpressure due to heartbeats produced after arterial occlusion.

Claims

1. An arterial pressure measurement system using an indirect method, wherein the system comprises:

a device applying an external contact force to a measurable artery;

an arterial expression sensor recording the expression produced by blood flow and arterial wall before, during and after receiving an external contact force through the device applying an external contact force, during arterial obliteration process;

a measuring and detection device that, based on the values recorded by both of the abovementioned devices, determines arterial cycle systolic and diastolic periods and therefore measures systolic and diastolic arterial pressure by detecting or not arterial expressions during the arterial cycle corresponding period through the arterial expression sensor and equaling the external contact force applied on the 1a measurable artery to the force required to occlude the same in the corresponding period.

2. The diastolic arterial pressure measurement system using an indirect method according to claim 1, wherein measuring diastolic arterial pressure is performed at artery occlusion in the diastolic period before the artery is fully occluded.

3. The diastolic arterial pressure measurement system using an indirect method according to claim 1, wherein systolic pressure measurement is performed at artery occlusion in the systolic period.

4. The diastolic arterial pressure measurement system using an indirect method according to claim 1, wherein the external contact force application device applies a gradual and measurable force.

5. The diastolic arterial pressure measurement system using an indirect method according to claim 1, wherein the external contact force application device is an inflatable cuff or a clip or a tip.

6. The diastolic arterial pressure measurement system using an indirect method according to claim 1, wherein the arterial expression sensor comprises one sensor able to measure any of the following arterial expressions:

blood flow or sound, arterial wall intermittent collisions, blood flow speed, arterial wall vibrations, frequency spectrum density, artery diameter or volume variation, temperature variation.

7. The diastolic arterial pressure measurement system using an indirect method according to claim 1, wherein the measurement and sensing device comprises an electronic motherboard configured to operated in two loops and two subsystems, a first loop and subsystem to control and measure arterial pressure and a second loop and subsystem to collect, prepare and analyze the signal data received from the arterial expression sensor.

8. An arterial pressure measurement system using an indirect method according to claim 1, wherein the arterial expression sensor detects the blood flow and arterial wall expressions in the arterial cycle diastolic and systolic period.

9. Arterial pressure measurement system according to claim 1, further comprising a circuitry central board in a complex electronic equipment, and board programming programmed to operate the central board, the central board comprising a motherboard with critical subsystems selected from the group comprising ports, connectors, system memory, at least one board for an arterial expression sensor, a pressure sensor board, and a main processing board, wherein the signals being received from the arterial expression sensor and the signals received from the pressure sensor of the force application device are processed by oscillometry or compared in order to record and provide a systolic or diastolic pressure value based on the detection or lack of detection of the arterial expression in the arterial cycle systolic period or diastolic period.

10. Arterial pressure measurement system according to claim 1, further comprising a data display device which may consist of a mechanical device through a graduated dial having indicators moving in response to pressure and decompression waves.

11. Arterial pressure measurement system according to claim 1, wherein the board for the arterial expression sensor comprises one of the following boards:

sound board, flow sensor, pressure sensor, laser sensor, vibration sensor, or phonogram sound sensor.

12. Arterial pressure measurement system according to claim 1, wherein the main board is configured to perform the following steps:

receiving the electrical output signal from the arterial expression sensor and from the pressure sensor, sampling and scan the received signals in order to be sent to the controller and therein execute processing, wherein the signal operation profits and ranges are reviewed and adjusted at this time also.

13. Arterial pressure measurement system according to claim 1, wherein with cuff insufflation and data collection and analysis, the second loop and subsystem collects blood variation data and delimits the arterial cycle systolic period and diastolic period and measures any variation in each one of these periods.

14. Arterial pressure measurement system according to claim 1, wherein the samples of the second loop and second subsystem variations are provided every millisecond and the amplitudes thereof are reviewed and compared until finding the zero or minimum amplitude range in the arterial cycle diastolic period and once it has been found, the pressure value between the first loop and the first subsystem is taken in order to be stored in the memory and it corresponds to the diastolic pressure value.

15. Arterial pressure measurement system according to claim 1, wherein if the signal amplitude variation in the diastolic period does not reach zero or the minimum range, the search continues until such a value is found.

16. Arterial pressure measurement system according to claim 1, wherein once the diastolic pressure value has been stored in the memory, the measurement continues to be performed and the second loop and second subsystem continue to collect data on blood variation by analyzing the arterial cycle systolic period and wherein the samples of variations are reviewed and compared until finding the zero or a minimum amplitude range value, once it has been found such a value corresponds to the systolic pressure value and is stored in the memory and displayed in the screen along with the diastolic pressure value.

17. Arterial pressure measurement system according to claim 1, wherein if the signal amplitude variation in the systolic period does not reach zero or the minimum, the search continues until such a value is found.

18. Arterial pressure measurement system according to claim 1, wherein during the assessment stage of the diastolic pressure value measurement, the system verifies first if there are at least two values with a minimum range or with a range equal to zero in the arterial cycle diastolic period, then a decision is made in order to fix the value or data found in the pressure sensor and determine the diastolic pressure value using an interruption taking the pressure sensor value and using for the activation of such an interruption the first value from the two values found in the arterial cycle diastolic period with a minimum range or a range equal to zero.

19. Arterial pressure measurement system according to claim 1, wherein during the assessment stage of the systolic pressure value measurement, the system verifies first if there are at least two values with a minimum range or a range equal to zero in the arterial cycle systolic period, then a decision is made in order to fix the value or data found in the pressure sensor and determine the systolic pressure value using an interruption taking the pressure sensor value and using for the activation of such an interruption the first value from the two values found in the systolic period with a minimum range or a range equal to zero.

20. Arterial pressure measurement system according to claim 1, wherein the arterial expression sensor detects and the arterial cycle detection device translates into electrical signals (analogue and digital signals) or oscillations the appearance or removal of the arterial expression of the arterial cycle diastolic or systolic period.

21. Method to measure arterial pressure by obliteration, wherein the method comprises the following stages:

i. obtaining an arterial cycle by differentiating the systolic and diastolic period;

ii. applying an external force on the artery and recording the arterial expression from every period;

iii. increasing the external force applied until equaling it to the artery pressure in the arterial cycle period to be measured; and

vi. measuring the target blood pressure within the target arterial cycle.

23. Method to measure pressure according to claim 21, wherein stage i is obtained through an arterial expression sensor based on arterial expressions without the blood flow and the arterial wall being affected by external forces.

24. Method to measure pressure according to claim 23, wherein stage iii further comprises increasing the force applied to the artery until affecting the blood flow and artery wall from the arterial cycle systolic period, recording blood expressions from the systolic period.

25. Method to measure pressure according to claim 24, wherein stage iii further comprises increasing the force applied to the artery until affecting the blood flow and arterial wall from the arterial cycle diastolic period, recording two blood expressions, one from the systolic period and the other from the diastolic period.

26. Method to measure pressure according to claim 25, wherein stage iii further comprises increasing the force applied until equaling the contact force being externally applied on the artery to the arterial pressure in the arterial cycle period and recording the arterial expression consisting in the disappearance of the blood flow in the arterial cycle period.

27. Method to measure pressure according to claim 26, wherein stage iv comprises measuring arterial pressure at the time on which the arterial expression disappears, whether in the systolic or diastolic period depending on the particular case.

29. Method to measure pressure according to claim 27, wherein stage iv comprises measuring diastolic arterial pressure and such a measurement is performed at artery occlusion in the diastolic period before the artery is fully occluded and the systolic arterial pressure measurement at the artery full occlusion is performed in the systolic period.

30. Method to measure pressure according to claim 21, further comprising providing a circuitry central board in a complex electronic equipment, programming of boards for electronic device general interaction, wherein the electronic device comprising f a motherboard having critical subsystems selected from the group of:

ports, connectors, system memory, at least one board for an arterial expression sensor, a pressure sensor board and a main processing board in which the signals received from the arterial expression sensor and the signals received from the pressure sensor of the force application device are processed using oscillometry or compared in order to record and emit a systolic or diastolic pressure value based on the detection or lack of detection of the arterial expression in the arterial cycle diastolic period or systolic period.

31. Method to measure pressure according to claim 21, further comprising providing a data display device that may consist of a mechanical device having a graduated dial with indicators moving in response to pressure and decompression waves.

32. Method to measure pressure according to claim 21, wherein the board for the arterial expression sensor comprises one of the following boards:

sound board, flow sensor, pressure sensor, laser sensor, vibrations sensor, and phonogram sound sensor.

33. Method to measure pressure according to claim 21, wherein the main board receives the electrical output signal from the arterial expression sensor and from the pressure sensor, samples and scans them in order to be sent and processed by the controller, wherein the signal profits and operating ranges are reviewed and adjusted at this time too.

34. Method to measure pressure according to claim 21, wherein with cuff insufflation and data collection and analysis, the second loop and subsystem collects blood variation data and delimits the arterial cycle diastolic period and systolic period and measures any variations in any of these periods.

35. Method to measure pressure according to claim 21, wherein the second loop and second subsystem variation samples are provided every millisecond and their amplitudes are reviewed and compared until, in the arterial cycle diastolic period, the zero or minimum amplitude range is found and, once it is found, the pressure value found in the first loop and the first subsystem is taken and stored in the memory and corresponds to the diastolic pressure value.

36. Method to measure pressure according to claim 21, wherein if the signal amplitude variation in the diastolic period does not reach zero or the minimum range, the search continues until such a value is found.

37. Method to measure pressure according to claim 21, wherein, once the diastolic pressure value has been stored in the memory, the measurement is performed and the second loop and second subsystem continue to collect blood variation data and now analyzes the arterial cycle systolic period wherein the variations samples are reviewed and compared until finding a zero or minimum amplitude range value, said value corresponding to systolic pressure and being stored in the memory and displayed on screen along with the diastolic pressure value.

38. Method to measure pressure according to claim 21, wherein if the signal amplitude variation in the systolic period does not reach zero or the minimum, the search continues until such a value is found.

39. Method to measure pressure according to claim 21, wherein during the assessment stage of the diastolic pressure value measurement, the system verifies first if there are at least two values with a minimum range or a range equal to zero in the arterial cycle diastolic period and a decision is then made in order to fix the value or data found in the pressure sensor and determine the diastolic pressure value using an interruption taking the pressure sensor value, using for the activation of such an interruption the first from the two values found in the arterial cycle diastolic period with a minimum range or a range equal to zero.

40. Method to measure pressure according to claim 21, wherein during the assessment stage of the systolic pressure value measurement, the system verifies first if there are at least two values with a minimum range or a range equal to zero in the arterial cycle systolic period and a decision is then made in order to fix the value or data found in the pressure sensor and determine the systolic pressure value using an interruption taking the pressure sensor value, using for the activation of such an interruption the first from the two values found in the systolic period with a minimum range or a range equal to zero.

41. Method to measure pressure according to claim 21, wherein the arterial expression sensor detects and the arterial cycle detection device translates into electrical signals (analogues and digitals) or oscillations the appearance or removal of the arterial expression of the arterial cycle diastolic or systolic period.

42. Method to measure pressure according to claim 21, wherein arterial expressions of the arterial cycle diastolic period that may occur, include the following:

blood flow or sound, arterial wall intermittent collisions, blood flow speed, arterial wall vibrations, frequency spectrum density, artery diameter or volume variation, and temperature variation.

22. Method to measure the diastolic arterial pressure by clearing, wherein the method comprises the following stages:

i. applying an external force on the artery until occluding it;

ii. releasing the external force applied until equaling it to the artery pressure in the arterial cycle diastolic period; and

iii. upon detecting the arterial expression corresponding to the arterial cycle diastolic period, measuring the diastolic arterial pressure.

28. Method to measure pressure according to claim 22, wherein stage iii comprises measuring diastolic arterial pressure at the time on which the arterial expression from the arterial cycle diastolic period appears.