COMBINED FLOORMAT AND BODY-WORN PHYSIOLOGICAL SENSORS

• US 20170188850A1
• Filed: 01/05/2016
• Published: 07/06/2017
• Est. Priority Date: 01/05/2016
• Status: Abandoned Application

• Current Assignee: Tosense Inc (Baxter International Inc.)
• Original Assignee: Tosense Inc (Baxter International Inc.)
• Inventors: BANET, Matthew, DHILLON, Marshal Singh, PEDE, Susan Meeks, DEPTALA, Arthur, HAYWARD, Lauren Nicole Miller, COCHRAN, Jonas Dean
• Application Number:
  US14/988,682
• Publication Number:
  US 20170188850A1
• Time in Patent Office: Days
• CPC Class Codes: A61B 2560/0238 Means for recording calibration data
• CPC Class Codes: A61B 5/0006 ECG or EEG signals
• CPC Class Codes: A61B 5/0022 Monitoring a patient using a global network, e.g. telephone networks, internet
• CPC Class Codes: A61B 5/02007 Evaluating blood vessel condition, e.g. elasticity, compliance
• 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 5/0205 Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
• CPC Class Codes: A61B 5/02055 Simultaneously evaluating both cardiovascular condition and temperature
• CPC Class Codes: A61B 5/021 Measuring pressure in heart or blood vessels A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/02116 of pulse wave amplitude A61B5/02225 takes precedence
• 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 5/0535 Impedance plethysmography for measuring blood flow A61B5/0295
• 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 5/25 Bioelectric electrodes therefor
• CPC Class Codes: A61B 5/4872 Body fat
• CPC Class Codes: A61B 5/6801 specially adapted to be attached to or worn on the body surface
• CPC Class Codes: A61B 5/6822 : Neck
• CPC Class Codes: A61B 5/6831 : Straps, bands or harnesses
• CPC Class Codes: A61B 5/6892 : Mats
• 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
• CPC Class Codes: G16H 40/67 : for remote operation
• CPC Class Codes: G16Z 99/00 : Subject matter not provided for in other main groups of this subclass

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 for generating a blood pressure calibration, 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 top surface and comprising an opening which covers a portion of at least one of the patient'"'"'s feet when it is in contact with the top surface, the pressure-delivery system comprising a flexible member configured to apply pressure to a portion of at least one of the patient'"'"'s feet, and a pressure sensor configured to measure the applied pressure; and

a processing system in electrical contact with the pressure sensor, and configured to receive signals from the pressure sensor and convert them into a set of pressure values, the processing system further configured to analyze the set of pressure values to determine the blood pressure calibration; and

a body-worn sensor comprising;

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

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

a computer-controlled system for receiving the blood pressure calibration; and

a processing system configured to process the first and second fiducial points 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 blood pressure calibration comprises values of systolic (SYS) and diastolic (DIA) blood pressure.

3. The system of claim 1, wherein the blood pressure calibration comprises a patient-specific relationship between a transit time and blood pressure.

4. The system of claim 1, wherein the floormat system further comprises a wireless transmitter.

5. The system of claim 4, wherein the wireless system is configured to wirelessly transmit information indicating the blood pressure calibration.

6. The system of claim 4, wherein the wireless transmitter comprises a transmitter based on Bluetooth®

or 802.11.

7. The system of claim 4, wherein the computer-controlled system further comprises a wireless system.

8. The system of claim 7, wherein the wireless system is configured to wirelessly receive information indicating the blood pressure calibration.

9. The system of claim 8, wherein the wireless system is configured to wirelessly receive information including initial values of blood pressure and a patient-specific relationship between blood pressure and a transit time.

10. The system of claim 7, wherein the wireless transmitter comprises a transmitter based on Bluetooth®

or 802.11.

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

12. The system of claim 11, wherein the pressure-delivery system further comprises a pump.

13. The system of claim 12, wherein the pump connects to the bladder and is configured to pump air into the bladder when the pump is powered on.

14. The system of claim 12, wherein the pressure-delivery system further comprises a valve connected to the pump.

15. The system of claim 14, wherein the valve connects to the bladder and is configured to pump air into the bladder when the pump is powered on.

16. The system of claim 11, wherein the pressure sensor connects to the bladder and is configured to measure a pressure within the bladder.

17. The system of claim 11, wherein the bladder is formed as a strap, with a first distal end of the strap connected to the top surface, and a second distal end of the strap connected to the top surface and comprising an opening configured to receive air from the pump.

18. The system of claim 1, wherein the processing system comprises computer code configured to analyze the set of pressure values to determine the blood pressure calibration.

19. The system of claim 18, wherein the computer code is further configured to filter the pressure values to determine a set of pressure-dependent oscillations that is dependent on the patient'"'"'s blood pressure.

20. The system of claim 19, wherein each pressure-dependent oscillation in the set of pressure-dependent oscillations is characterized by a pressure value and an amplitude value.

21. The system of claim 20, wherein the computer code is further configured to determine the pressure-dependent oscillation having a maximum amplitude value.

22. The system of claim 21, wherein the computer code is further configured to determine a mean arterial pressure (MAP) from the pressure-dependent oscillation having the maximum amplitude value.

23. The system of claim 21, wherein the computer code is further configured to determine a systolic blood pressure (SYS) from a first pressure-dependent oscillation characterized by an amplitude that, when divided by the maximum amplitude of the pressure-dependent oscillations, is substantially equivalent to a first pre-determined ratio.

24. The system of claim 23, wherein the first pre-determined ratio is between 0.4 and 0.8.

25. The system of claim 21, wherein the computer code is further configured to determine a diastolic blood pressure (DIA) from a second pressure-dependent oscillation characterized by an amplitude that, when divided by the maximum amplitude of the pressure-dependent oscillations, is substantially equivalent to a second pre-determined ratio.

26. The system of claim 25, wherein the second pre-determined ratio is between 0.4 and 0.8.

27. The system of claim 19, wherein the system measures the set of pressure-dependent oscillations while the pressure-delivery system inflates the flexible member.

28. The system of claim 19, wherein the system measures the set of pressure-dependent oscillations while the pressure-delivery system deflates the flexible member.