PATIENT MONITORING SYSTEM

• US 20170196470A1
• Filed: 12/22/2016
• Published: 07/13/2017
• Est. Priority Date: 06/21/2011
• Status: Active Grant

• Current Assignee: Masimo Corporation
• Original Assignee: Masimo Corporation
• Inventors: Kiani, Massi Joe E., Lam, Ken, Dalvi, Cristiano, Lamego, Marcelo, Vo, Hung The
• Granted Patent: US 11,272,852 B2
• Time in Patent Office: Days
• CPC Class Codes: A61B 17/135 inflatable for measuring blood pressure A61B5/022; inflatable pressure pads A61F5/34
• CPC Class Codes: A61B 2560/0214 of power generation or supply
• CPC Class Codes: A61B 5/0002 Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network A61B5/07 takes precedence; transmission systems for measured values G08C; transmission H04B; transmission of digital information H04L; wireless communication networks H04W
• CPC Class Codes: A61B 5/002 Monitoring the patient using a local or closed circuit, e.g. in a room or building A61B5/0017 takes precedence
• CPC Class Codes: A61B 5/0022 Monitoring a patient using a global network, e.g. telephone networks, internet
• CPC Class Codes: A61B 5/0205 Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
• CPC Class Codes: A61B 5/021 Measuring pressure in heart or blood vessels A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/02141 Details of apparatus construction, e.g. pump units or housings therefor, cuff pressurising systems, arrangements of fluid conduits or circuits A61B5/02233, A61B5/0235 take precedence
• CPC Class Codes: A61B 5/022 by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers
• CPC Class Codes: A61B 5/02225 using the oscillometric method
• 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 5/0235 Valves specially adapted therefor
• CPC Class Codes: A61B 5/222 combined with detection or measurement of physiological parameters, e.g. heart rate
• CPC Class Codes: A61B 5/7221 Determining signal validity, reliability or quality A61B5/7207 and A61B5/7217 take precedence
• CPC Class Codes: A61B 5/7225 Details of analog processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation A61B5/30, A61B5/316 take precedence; transformers for specific applications H01F38/00; amplifiers H03F
• CPC Class Codes: A61B 5/725 using specific filters therefor, e.g. Kalman or adaptive filters A61B5/316 take precedence
• CPC Class Codes: A61B 5/742 using visual displays A61B5/339 takes precedence
• CPC Class Codes: G06N 7/01 Probabilistic graphical models, e.g. probabilistic networks
• CPC Class Codes: G16H 40/63 for local operation

Abstract

A method of determining blood pressure measurements includes inflating a cuff, receiving an indication of pressure inside the cuff during inflation, determining a blood pressure based at least in part on the received indication, assigning a confidence level to the blood pressure, and determining whether the confidence level satisfies a threshold confidence level. Based at least on a determination that the confidence level satisfies a threshold confidence level, the method can include causing a display to display the blood pressure. Based at least on a determination that the confidence level does not satisfy a threshold confidence level, the method can include deflating the cuff, receiving an indication of pressure inside the cuff during deflation, determining another blood pressure, and causing a display to display a blood pressure.

Claims

1. A method of determining one or more blood pressure measurements, the method comprising:

inflating an inflatable cuff configured to encompass a limb of a monitored patient using a replaceable gas reservoir or a portable inflation system;

receiving a first data signal indicative of pressure inside the inflatable cuff during inflation;

determining a first blood pressure of the monitored patient during inflation based at least in part on the received first data signal;

assigning a confidence level to the first blood pressure;

determining whether the confidence level satisfies a threshold confidence level; and

based at least in part on a determination that the confidence level does not satisfy the threshold confidence level;

deflating the inflatable cuff,

receiving a second data signal indicative of pressure inside the inflatable cuff during deflation,

determining a second blood pressure of the monitored patient based at least in part on the received second data signal, and

causing a display to display at least one of the first blood pressure or the second blood pressure.

2. The method of claim 1, wherein determining a first blood pressure comprises:

filtering the first data signal;

identifying a maximum magnitude of the filtered first signal; and

associating a pressure of the inflatable cuff during approximately the identified maximum magnitude with a first systolic pressure.

3. The method of claim 1, wherein determining a second blood pressure comprises:

filtering the second data signal;

identifying a maximum magnitude of the filtered second signal during deflation of the inflatable cuff, a maximum slope of the filtered second signal prior to the maximum magnitude, and a maximum slope of the filtered second signal following the maximum magnitude; and

associating a pressure of the inflatable cuff during approximately the identified maximum slope of the filtered second signal prior to the maximum magnitude with a second systolic pressure.

4. The method of claim 1, further comprising:

determining whether pressure within the replaceable gas reservoir satisfies a threshold pressure level; and

upon determining the replaceable gas reservoir does not satisfy the threshold pressure level, causing the display to display a notification.

5. The method of claim 1, further comprising causing the display to display a waveform of the first data signal and/or the second data signal.

6. The method of claim 1, further comprising determining the confidence level of the first blood pressure based on an amount and magnitude of noise observed in the first data signal.

7. The method of claim 1, further comprising communicating with electronics of the replaceable gas reservoir.

8. The method of claim 7, wherein the electronics indicate whether the replaceable gas reservoir is authorized.

9. The method of claim 7, wherein the electronics associated with the gas reservoir indicate reservoir characteristics.

10. The method of claim 7, wherein the electronics indicate usage of the replaceable gas reservoir.

11. The method of claim 10, wherein updated data responsive to usage of the replaceable gas reservoir is written to the electronics of the replaceable gas reservoir.

12. A method of determining one or more blood pressure measurements, the method comprising:

inflating an inflatable cuff configured to encompass a limb of a monitored patient;

receiving a first data signal indicative of pressure inside the inflatable cuff during inflation;

determining a first blood pressure of the monitored patient based at least in part on the received first data signal;

assigning a confidence level to the first blood pressure;

determining whether the confidence level satisfies a threshold confidence level; and

based at least in part on a determination that the confidence level satisfies the threshold confidence level, causing a display to display at least the first blood pressure.

13. The method of claim 12, further comprising:

based at least in part on a determination that the confidence level does not satisfy the threshold confidence level;

deflating the inflatable cuff;

receiving a second data signal indicative of pressure inside the inflatable cuff during deflation;

determining a second blood pressure of the monitored patient based at least in part on the received second data signal; and

causing a display to display at least one of the first blood pressure or the second blood pressure.

14. The method of claim 12, further comprising inflating the inflatable cuff using a replaceable gas reservoir or a portable inflation system.

15. The method of claim 14, further comprising communicating with electronics of the replaceable gas reservoir.

16. A method of determining one or more blood pressure measurements, the method comprising:

inflating an inflatable cuff configured to encompass a limb of a monitored patient;

receiving a first data signal indicative of pressure inside the inflatable cuff during inflation;

determining a first blood pressure of the monitored patient based at least in part on the received first data signal;

deflating the inflatable cuff;

receiving a second data signal indicative of pressure inside the inflatable cuff during deflation;

determining a second blood pressure of the monitored patient based at least in part on the received second data signal; and

causing a display to display at least one of the first blood pressure or the second blood pressure to a display device.

17. The method of claim 16, wherein determining a first blood pressure comprises:

filtering the first data signal;

identifying a maximum magnitude of the filtered first signal; and

associating a pressure of the inflatable cuff during approximately the identified maximum magnitude with a first systolic pressure.

18. The method of claim 16, wherein determining a second blood pressure comprises:

filtering the second data signal;

identifying a maximum magnitude of the filtered second signal during deflation of the inflatable cuff, a maximum slope of the filtered second signal prior to the maximum magnitude, and a maximum slope of the filtered second signal following the maximum magnitude; and

associating a pressure of the inflatable cuff during approximately the identified maximum slope of the filtered second signal prior to the maximum magnitude with a second systolic pressure.

19. The method of claim 16, further comprising inflating the inflatable cuff using a replaceable gas reservoir or a portable inflation system.

20. The method of claim 19, further comprising communicating with electronics of the replaceable gas reservoir.