Patient monitoring system

• US 11,272,852 B2
• Filed: 12/22/2016
• Issued: 03/15/2022
• Est. Priority Date: 06/21/2011
• Status: Active Grant

• Current Assignee: Masimo Corporation
• Original Assignee: Masimo Corporation
• Inventors: Lamego, Marcelo, Kiani, Massi Joe E, Lam, Ken, Dalvi, Cristiano, Vo, Hung The
• Primary Examiner(s): Jackson, Gary
• Assistant Examiner(s): Lukjan, Sebastian X
• Application Number:
  US15/388,605
• Publication Number:
  US 20170196470A1
• Time in Patent Office: 1,909 Days
• CPC Class Codes: G06N 7/01 Probabilistic graphical models, e.g. probabilistic networks

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, by a processor, to the first blood pressure;

determining, by the processor, 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;

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

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 said determining the first blood pressure comprises:

filtering the first data signal;

identifying a maximum magnitude of the filtered first data signal; and

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

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

filtering the second data signal;

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

associating a pressure of the inflatable cuff at 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 at least one of the first data signal 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, by a processor, to the first blood pressure;

determining, by the processor, whether the confidence level satisfies a threshold confidence level;

based at least in part on a determination that the confidence level satisfies the threshold confidence level;

determining not to determine another blood pressure during a deflation of the inflatable cuff, and

causing a display to display at least the first blood pressure; and

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

determining a second blood pressure during the deflation of the inflatable cuff, and

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

13. The method of claim 12, further comprising:

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

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

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

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.