COMBINED FLOORMAT AND BODY-WORN PHYSIOLOGICAL SENSORS

• US 20170188975A1
• Filed: 01/05/2016
• Published: 07/06/2017
• Est. Priority Date: 01/05/2016
• Status: Abandoned Application

• Current Assignee: OtoSense, Inc. (Analog Devices, Inc.)
• Original Assignee: OtoSense, Inc. (Analog Devices, Inc.)
• Inventors: HAYWARD, Lauren Nicole Miller, COCHRAN, Jonas Dean, BANET, Matthew, DHILLON, Marshal Singh, PEDE, Susan Meeks, DEPTALA, Arthur
• Application Number:
  US14/988,685
• Publication Number:
  US 20170188975A1
• Time in Patent Office: Days
• CPC Class Codes: A61B 2560/0238 Means for recording calibration data
• CPC Class Codes: A61B 2562/066 in a matrix array
• CPC Class Codes: A61B 5/0022 Monitoring a patient using a global network, e.g. telephone networks, internet
• CPC Class Codes: A61B 5/02028 Determining haemodynamic parameters not otherwise provided for, e.g. cardiac contractility or left ventricular ejection fraction
• CPC Class Codes: A61B 5/02055 Simultaneously evaluating both cardiovascular condition and temperature
• CPC Class Codes: A61B 5/02233 Occluders specially adapted therefor tourniquets A61B17/132
• CPC Class Codes: A61B 5/0235 Valves specially adapted therefor
• CPC Class Codes: A61B 5/02438 with portable devices, e.g. worn by the patient
• CPC Class Codes: A61B 5/0245 by using sensing means generating electric signals, i.e. ECG signals
• CPC Class Codes: A61B 5/029 Measuring or recording blood output from the heart, e.g. minute volume A61B8/065 takes precedence
• CPC Class Codes: A61B 5/0295 using plethysmography, i.e. measuring the variations in the volume of a body part as modified by the circulation of blood therethrough, e.g. impedance plethysmography
• CPC Class Codes: A61B 5/053 Measuring electrical impedance or conductance of a portion of the body
• CPC Class Codes: A61B 5/0816 Measuring devices for examining respiratory frequency measuring frequency of electric signals G01R23/00
• CPC Class Codes: A61B 5/14542 for measuring blood gases A61B5/14551 takes precedence
• CPC Class Codes: A61B 5/14552 Details of sensors specially adapted therefor
• CPC Class Codes: A61B 5/4872 Body fat
• CPC Class Codes: A61B 5/6822 Neck
• CPC Class Codes: A61B 5/6824 Arm or wrist
• CPC Class Codes: A61B 5/6829 Foot or ankle
• 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 5/7278 : Artificial waveform generation or derivation, e.g. synthesising signals from measured signals A61B5/327 takes precedence

Abstract

The invention provides systems for measuring blood pressure and stroke volume values from a patient. Both systems feature a floormat system and a body-worn sensor working in concert. In aspects, the floormat generates calibrations for both blood pressure and stroke volume measurements. It features a base having a bottom surface configured to rest on or near a substantially horizontal surface, and a top surface configured to receive at least one of the patient'"'"'s feet. Within the floormat are weight and blood pressure-measuring systems that determine, respectively, the calibrations for stroke volume and blood pressure. Its transmits these parameters to the body-worn sensor, which further processes them, along with other signals, to determine real-time values of blood pressure and stroke volume.

Claims

1. A system for measuring a blood pressure value from a patient, comprising:

a floormat system comprising;

a base comprising a bottom surface configured to rest on or near a substantially horizontal surface, and a top surface configured to receive at least one of the patient'"'"'s feet;

a pressure-delivery system connected to the base through a tubular component and comprising a flexible member configured to apply pressure to a portion of at least one of the patient'"'"'s arms, and a pressure sensor configured to measure a first set of signals representative of pressure applied to the portion of at least one of the patient'"'"'s arms; and

a processing system in electrical contact with the pressure sensor and configured to;

     1) receive the first set of signals from the pressure-delivery system and convert them into a set of pressure values; and

     2) collectively analyze the set of pressure values and the set of pulsatile signals to determine a blood pressure calibration; and

a body-worn sensor comprising;

a first sensor for measuring a first time-dependent physiological waveform from the patient and then processing the first time-dependent waveform to determine a first fiducial point;

a second sensor for measuring a second time-dependent physiological waveform from the patient and then processing the second time-dependent waveform to determine a second fiducial point;

a processing system configured to receive the blood pressure calibration and process the first and second fiducial point to determine a transit time, and further configured to process the transit time and the blood pressure calibration to determine a blood pressure value.

2. The system of claim 1, wherein the flexible member is a bladder.

3. The system of claim 2, wherein the pressure-delivery system further comprises a pump.

4. The system of claim 3, wherein the pump connects to the bladder and is configured to pump air through the tubular component and into the bladder when the pump is powered on.

5. The system of claim 3, wherein the pressure-delivery system further comprises a valve connected to the pump.

6. The system of claim 5, wherein the valve connects to the bladder and is configured to pump air into the bladder when the pump is powered on.

7. The system of claim 2, wherein the pressure sensor connects to the bladder and is configured to measure a pressure within the bladder.

8. The system of claim 1, wherein the processing system comprises computer code configured to analyze an amplitude and a pressure corresponding to at least one of the pulsatile signals.

9. The system of claim 8, wherein the processing system comprises computer code configured to analyze a set of amplitudes corresponding to the set of pulsatile signals, each corresponding to a unique pressure value.

10. The system of claim 9, wherein the computer code is configured to determine an amplitude in the set of amplitudes having a value that is between 0.4 and 0.8 of a maximum value of the pulsatile signals.

11. The system of claim 10, wherein the computer code is configured to estimate systolic blood pressure (SYS) from the amplitude in the set of amplitudes having a value that is between 0.4 and 0.8 of a maximum value of the pulsatile signals.

12. The system of claim 11, wherein the computer code is configured to approximate amplitude values in the set of amplitudes with a mathematical function.

13. The system of claim 10, wherein the computer code is configured to estimate mean arterial pressure (MAP) from an amplitude in the set of amplitudes having the maximum value.

14. The system of claim 13, wherein the computer code is configured to approximate amplitude values in the set of amplitudes with a mathematical function.

15. The system of claim 14, wherein the computer code is configured to estimate MAP from a maximum value of the mathematical function.

16. The system of claim 10, wherein the computer code is configured to estimate diastolic blood pressure (SYS) from the amplitude in the set of amplitudes having a value that is between 0.4 and 0.8 of a maximum value of the pulsatile signals.

17. The system of claim 16, wherein the computer code is configured to approximate amplitude values in the set of amplitudes with a mathematical function.