Motion management in a fast blood pressure measurement device

• US 8,734,355 B2
• Filed: 07/22/2008
• Issued: 05/27/2014
• Est. Priority Date: 07/14/2003
• Status: Active Grant

• Current Assignee: Welch Allyn Incorporated
• Original Assignee: Welch Allyn Incorporated
• Inventors: Whitaker, Ty, Wilson, Stephen C., Spang, Knut, Wawro, Thaddeus J., Lane, John A.
• Primary Examiner(s): D'Angelo, Michael
• Assistant Examiner(s): WESTON, TIFFANY C
• Application Number:
  US12/177,521
• Publication Number:
  US 20080281211A1
• Time in Patent Office: 2,135 Days
• Field of Search: 600481-499, 606201-203
• US Class Current: 600/490
• CPC Class Codes: A61B 5/02233 Occluders specially adapted therefor tourniquets A61B17/132
• CPC Class Codes: A61B 5/0225 the pressure being controlled by electric signals, e.g. derived from Korotkoff sounds
• CPC Class Codes: A61B 5/7207 of noise induced by motion artifacts

Abstract

The invention is in one embodiment an apparatus and a method for measuring the blood pressure of a vertebrate subject. The apparatus uses an inflatable chamber with a sensor to detect signals indicative of a blood pressure of the subject during an inflation interval of the inflatable chamber. If secondary motion or artifact signals are detected, the apparatus and method determine whether the secondary signals are below a predetermined value, and if so, complete the measurement. If the signals indicate that the measurement is not accurate, the system and method immediately institute a measurement of the blood pressure during a deflation interval, which can include a step deflation interval. In the event that the subject is identified as a neonate, the system and method immediately measure using the deflation interval procedure.

Claims

1. A blood pressure measurement apparatus configured to operate according to an oscillometric method of measuring blood pressure, said apparatus comprising:

an inflatable chamber configured to be inflated during an inflation interval and deflated during a deflation interval;

a sensor coupled to the inflatable chamber, the sensor configured to measure a signal according to the oscillometric method of measuring blood pressure, the signal comprising information indicative of a blood pressure of a vertebrate;

a control module configured to receive as input at least a portion of the signal from the sensor, and configured to generate as output a control signal having a selected one of a plurality of values responsive to the input;

a first analysis module configured to analyze the signal before the inflatable chamber is fully inflated to extract from the signal a systolic blood pressure and a diastolic blood pressure of the vertebrate according to the oscillometric method of measuring blood pressure;

a second analysis module selectively operative in response to one of the plurality of values of the control signal, the second analysis module configured to analyze the signal during the deflation interval of the inflatable chamber to extract from the signal the blood pressure of the vertebrate according to the oscillometric method of measuring blood pressure; and

a neonate sensor module configured to represent whether the vertebrate is a neonate vertebrate by determining whether the vertebrate is 28 days or less in terms of age,

wherein in response to a positive determination that the vertebrate is a neonate vertebrate, the apparatus completes a blood pressure measurement of the neonate vertebrate using the second analysis module,

whereby the apparatus completes the measurement of the blood pressure of the vertebrate using at least one of the first analysis module and the second analysis module.

2. The apparatus of claim 1, wherein the first analysis module configured to analyze the signal during the inflation interval of the inflatable chamber at a rate greater than 3 mmHg per second.

3. The apparatus of claim 1, wherein the first analysis module is configured to determine if the systolic blood pressure and the diastolic blood pressure of the vertebrate are obtained with a fast inflation rate, the inflatable chamber being deflated upon a successful determination by the first analysis module.

4. The apparatus of claim 1, wherein the deflation interval comprises at least one step deflation interval.

5. The apparatus of claim 1, wherein the plurality of control signal values comprises a first value that inhibits operation of the second analysis module and a second value that activates operation of the second analysis module.

6. The apparatus of claim 1, further comprising a reporting module configured to report at least one of the systolic blood pressure and the diastolic blood pressure.

7. The apparatus of claim 1, further comprising:

a motion detection module configured to receive as input at least a portion of the signal from the sensor, the motion detection module configured to detect a secondary motion of the vertebrate distinct from motion associated with the signal comprising information indicative of a blood pressure of a vertebrate, the motion detection module configured to communicate a value to the first analysis module;

whereby, in the event that the value of the secondary motion detected by the detection module is below a predetermined value, the apparatus completes a blood pressure measurement of the vertebrate using the first analysis module.

8. The apparatus of claim 7, wherein the motion detection module is configured to provide a warning, the warning being generated in response to the secondary motion that exceeds the predetermined value.

9. The apparatus of claim 8, further comprising an announcement module that announces the warning.

10. The apparatus of claim 9, wherein the announcement is a visual announcement.

11. The apparatus of claim 9, wherein the announcement is an audible announcement.

12. The apparatus of claim 9, wherein the blood pressure measurement is completed if the secondary motion falls below the predetermined value within a defined time period after the announcement of the warning.

13. The apparatus of claim 7, wherein the second analysis module is operative in the event that the value of the secondary motion detected by the motion detector module is at least equal, to the predetermined value, whereby the apparatus completes the measurement of the blood pressure of the vertebrate using the second analysis module.

14. An oscillometric blood pressure measurement method, comprising the steps of:

providing an inflatable chamber configured to be inflated during an inflation interval and deflated during a deflation interval;

measuring a signal comprising information indicative of a blood pressure of a vertebrate, the signal generated according to an oscillometric blood pressure measurement method;

analyzing the signal before the inflatable chamber is fully inflated to extract from the signal a systolic blood pressure and a diastolic blood pressure of the vertebrate;

if necessary, responsive to a control signal, analyzing the signal during the deflation interval of the inflatable chamber to extract from the signal the blood pressure of the vertebrate according to an oscillometric blood pressure measurement method; and

representing whether the vertebrate is a neonate vertebrate,

wherein in response to a positive determination that the vertebrate is a neonate vertebrate, the method completes a blood pressure measurement of the neonate vertebrate by analyzing the signal during the deflation interval,

whereby a measurement of the blood pressure of the vertebrate according to an oscillometric blood pressure measurement method is accomplished.

15. The method of claim 14, further comprising analyzing the signal during an inflation of the inflatable chamber at a rate greater than 3 mmHg per second.

16. The method of claim 14, further comprising:

determining if the systolic blood pressure and the diastolic blood pressure of the vertebrate are obtained with a fast inflation rate; and

upon a successful determination, deflating the inflatable chamber.

17. The method of claim 14, wherein the deflation interval comprises at least one step deflation interval.

18. The method of claim 14, further comprising reporting at least one of the systolic blood pressure and the diastolic blood pressure.

19. The method of claim 14, further comprising detecting a secondary motion of the vertebrate distinct from the motion comprising information indicative of the blood pressure, whereby, in the event that the secondary motion is below a predetermined value, the method completes the blood pressure measurement.

20. The method of claim 19, wherein the motion detection module is configured to provide a warning, the warning being generated in response to the secondary motion that exceeds the predetermined value.

21. The method of claim 20, wherein the motion detection module includes an announcement module that announces the warning.

22. The method of claim 21, wherein the blood pressure measurement is completed if the secondary motion falls below the predetermined value within a defined time period after the announcement of the warning.

23. The method of claim 19, further comprising the steps of:

in the event that the value of the secondary motion detected by the motion detector module is at least equal to the predetermined value, analyzing the signal during the deflation interval of the inflatable chamber to extract from the signal the blood pressure of the vertebrate, whereby the blood pressure of the vertebrate is determined.