PATIENT MONITORING SYSTEM

• US 20180333055A1
• Filed: 05/23/2018
• Published: 11/22/2018
• Est. Priority Date: 06/21/2011
• Status: Active Grant

• Current Assignee: Masimo Corporation
• Original Assignee: Masimo Corporation
• Inventors: Lamego, Marcelo M., Kiani, Massi Joe E., Poeze, Jeroen, Dalvi, Cristiano, Vo, Hung
• Granted Patent: US 11,109,770 B2
• Time in Patent Office: Days
• CPC Class Codes: A61B 2560/0214 of power generation or supply
• 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 5/6824 Arm or wrist
• CPC Class Codes: A61B 5/6828 Leg
• CPC Class Codes: A61B 5/72 Signal processing specially adapted for physiological signals or for diagnostic purposes character recognition, recognising digital ink, document-oriented image-based pattern recognition G06V30/00; recognition or understanding of postal images G06V30/424
• CPC Class Codes: A61B 5/7221 Determining signal validity, reliability or quality A61B5/7207 and A61B5/7217 take precedence
• CPC Class Codes: A61B 5/725 using specific filters therefor, e.g. Kalman or adaptive filters A61B5/316 take precedence

Abstract

A patient monitoring system includes an inflatable cuff, a gas reservoir containing a compressed gas, and a sensor. When the inflatable cuff is coupled to a wearer, the gas reservoir supplies gas to the inflatable cuff to inflate the inflatable cuff via gas pathways. As the inflatable cuff inflates, a patient monitor can receive blood pressure data from the sensor and use the blood pressure data to determine the blood pressure of the wearer. The patient monitor can also receive blood pressure data during deflation of the inflatable cuff to determine the blood pressure of the wearer.

Claims

1-77. -77. (canceled)

78. 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 gas reservoir storing compressed gas;

receiving blood pressure data comprising a plurality of data signals from one or more sensors responsive to blood pressure of the monitored patient;

filtering the blood pressure data using a first filter to obtain first filtered blood pressure data;

determining a pulse based at least on the first filtered blood pressure data;

filtering the first filtered blood pressure data based at least on the determined pulse to obtain second filtered blood pressure data; and

determining a systolic pressure and a diastolic pressure of the monitored patient based at least on the second filtered blood pressure data.

79. The method of claim 78, wherein receiving blood pressure data further comprises receiving the plurality of data signals from the one or more sensors during inflation of the inflatable cuff.

80. The method of claim 78, wherein receiving blood pressure data further comprises receiving the plurality of data signals from the one or more sensors during deflation of the inflatable cuff.

81. The method of claim 78, wherein filtering the blood pressure data further comprises filtering the blood pressure data using the first filter during inflation of the inflatable cuff.

82. The method of claim 78, wherein filtering the blood pressure data further comprises filtering the blood pressure data using the first filter during deflation of the inflatable cuff.

83. The method of claim 78, wherein the pulse is determined based at least in part on blood pressure data received during inflation of the inflatable cuff.

84. The method of claim 78, wherein the pulse is determined based at least in part on blood pressure data received during deflation of the inflatable cuff.

85. The method of claim 78, wherein determining the pulse further comprises transforming the blood pressure data into a frequency domain.

86. The method of claim 78, wherein at least one of the systolic pressure and the diastolic pressure is determined based at least in part on blood pressure data received during inflation of the inflatable cuff.

87. The method of claim 78, wherein determining the systolic pressure and the diastolic pressure of the monitored patient comprises using at least one of a lookup table or calibration curve.

88. The method of claim 78, further comprising:

normalizing one or more peaks in the second filtered blood pressure data according to a threshold peak value; and

determining one or more parameters of the normalized peaks, wherein the systolic pressure and diastolic pressure are determined based on the one or more parameters.

92. A patient monitoring system comprising:

an inflatable cuff configured to encompass a limb of a monitored patient and inflate using a gas reservoir storing compressed gas;

one or more sensors configured to detect blood pressure data responsive to blood pressure of the monitored patient;

one or more processors configured to;

filter the blood pressure data using a first filter to obtain first filtered blood pressure data;

determine a pulse based at least on the first filtered blood pressure data;

filter the first filtered blood pressure data based at least on the determined pulse to obtain second filtered blood pressure data; and

determine a systolic pressure and a diastolic pressure of the monitored patient based at least on the second filtered blood pressure data.

89. The method of claim 92, wherein the threshold peak value is determined based at least on a value of a peak with a maximum amplitude.

90. The method of claim 92, wherein the threshold peak value is determined based at least on a location of the one or more peaks.

91. The method of claim 92, wherein normalizing comprises accounting for changes in pressure due to inflating or deflating the inflatable cuff.

97. The patient monitoring system of claim 97, wherein at least one of the systolic pressure and the diastolic pressure is determined based at least in part on blood pressure data received during inflation of the inflatable cuff.

93. The patient monitoring system of claim 97, wherein the plurality of data signals are received from the one or more sensors during inflation of the inflatable cuff.

94. The patient monitoring system of claim 97, wherein the plurality of data signals are received from the one or more sensors during deflation of the inflatable cuff.

95. The patient monitoring system of claim 97, wherein the one or more processors are further configured to:

normalize one or more peaks in the second filtered blood pressure data according to a threshold peak value; and

determine one or more parameters of the normalized peaks, wherein the systolic pressure and diastolic pressure are determined based on the one or more parameters.

96. The patient monitoring system of claim 97, wherein the one or more processors are configured to filter the blood pressure data during inflation of the inflatable cuff.