Telemetry of wearable medical device information to secondary medical device or system

• US 10,602,945 B2
• Filed: 03/13/2018
• Issued: 03/31/2020
• Est. Priority Date: 03/13/2018
• Status: Active Grant

• Current Assignee: Zoll Medical Corporation (Asahi Kasei Corporation)
• Original Assignee: Zoll Medical Corporation (Asahi Kasei Corporation)
• Inventors: Volpe, Shane, Freeman, Gary A.
• Primary Examiner(s): Flory, Christopher A
• Application Number:
  US15/920,142
• Publication Number:
  US 20190282115A1
• Time in Patent Office: 749 Days
• CPC Class Codes: A61B 5/0006 ECG or EEG signals
• 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 5/0024 for multiple sensor units attached to the patient, e.g. using a body or personal area network
• 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 5/02438 with portable devices, e.g. worn by the patient
• CPC Class Codes: A61B 5/25 Bioelectric electrodes therefor
• CPC Class Codes: A61B 5/30 Input circuits therefor
• CPC Class Codes: A61B 5/302 for capacitive or ionised electrodes, e.g. metal-oxide-semiconductor field-effect transistors [MOSFET]
• CPC Class Codes: A61B 5/316 Modalities, i.e. specific diagnostic methods
• CPC Class Codes: A61B 5/327 Generation of artificial ECG signals based on measured signals, e.g. to compensate for missing leads
• CPC Class Codes: A61B 5/6805 Vests
• CPC Class Codes: A61B 5/6831 Straps, bands or harnesses
• CPC Class Codes: A61B 5/7475 User input or interface means, e.g. keyboard, pointing device, joystick
• CPC Class Codes: A61N 1/36507 controlled by gradient or slope of the heart potential
• CPC Class Codes: A61N 1/3904 External heart defibrillators [EHD]
• CPC Class Codes: G16H 20/30 relating to physical therapies or activities, e.g. physiotherapy, acupressure or exercising
• CPC Class Codes: G16H 40/63 for local operation
• CPC Class Codes: G16H 40/67 for remote operation
• CPC Class Codes: G16H 50/20 for computer-aided diagnosis, e.g. based on medical expert systems
• CPC Class Codes: G16H 50/30 for calculating health indices; for individual health risk assessment

Abstract

A physiological signal monitoring system includes a single set of sensing electrodes to provide conditioned physiological signals to a primary monitoring device and a secondary monitoring device. The monitoring system includes pre-processing circuitry configured to receive a raw physiological signal. The pre-processing circuitry is configured to produce a primary physiological signal and a secondary physiological signal. Each of the primary and secondary physiological signals are conditioned. The primary conditioned physiological signal is directed to a primary monitoring device such as a hospital wearable defibrillator device. The secondary conditioned physiological signal is directed to telemetry modeling circuitry where it is further processed to output one or more telemetry signals. The one or more telemetry signals are output to a secondary monitoring device such as a three lead ECG monitoring device. Thus, a single set of sensing electrodes can provide physiological signals to multiple monitoring devices.

Claims

1. An electrocardiogram (ECG) signal processing system, comprising:

a plurality of ECG sensing electrodes configured to be placed proximate to a patient'"'"'s skin and detect at least one raw ECG signal lead of the patient; and

an ECG node device comprising

an ECG pre-processing circuitry operably connected to the plurality of ECG sensing electrodes and configured to

receive the at least one raw ECG signal lead via the plurality of ECG sensing electrodes; and

process the at least one raw ECG signal lead to produce a primary ECG signal lead and a secondary ECG signal lead split from the primary ECG signal lead such that the secondary ECG signal lead is substantially the same as the primary ECG signal lead;

a first ECG signal conditioning circuitry configured to condition the primary ECG signal lead and provide the conditioned primary ECG signal lead to a primary ECG monitoring system;

a second ECG signal conditioning circuitry configured to be electrically isolated from the first ECG signal conditioning circuitry and configured to condition the secondary ECG signal lead; and

a telemetry circuitry electrically coupled to the second ECG signal conditioning circuitry, the telemetry circuitry comprising

a telemetry input configured to receive the conditioned secondary ECG signal lead and at least one input from the primary ECG monitoring system;

a telemetry simulation circuitry configured to simulate one or more ECG signal conditions of the patient based on the conditioned secondary ECG signal lead and the at least one input from the primary ECG monitoring system; and

a plurality of telemetry output connectors configured to provide one or more output telemetry signals based on the simulated one or more ECG signal conditions of the patient to a secondary ECG processing system.

2. The ECG signal processing system of claim 1, wherein the telemetry simulation circuitry comprises one or more relays to disconnect the telemetry circuitry from the plurality of telemetry output connectors in response to the at least one input from the primary ECG monitoring system.

3. The ECG signal processing system of claim 2, wherein the at least one input from the primary ECG monitoring system comprises one or more of an electrode falloff condition, an indication of a noise condition, and an indication of an arrhythmia condition.

4. The ECG signal processing system of claim 1, wherein the at least one raw ECG signal lead comprises a plurality of raw ECG signal leads, and the telemetry circuity is configured to provide a plurality of output telemetry signals corresponding to each one of the plurality of raw ECG signal leads of the patient.

5. The ECG signal processing system of claim 1, wherein the simulated one or more ECG signal conditions of the patient comprises an electrode falloff condition.

6. The ECG signal processing system of claim 1, wherein the second ECG signal conditioning circuitry is further configured to filter out one or more electrical signals applied to the patient by the primary ECG monitoring system.

7. The ECG signal processing system of claim 1, wherein the telemetry circuitry further comprises a patient model comprising a resistor network configured to model one or more electrical parameters of the patient.

8. The ECG signal processing system of claim 7, wherein the telemetry simulation circuitry is further configured to simulate the one or more ECG signal conditions by directing the conditioned secondary ECG signal lead through the resistor network.

9. The ECG signal processing system of claim 8, wherein the simulated one or more ECG signal conditions comprise a noise condition and an arrhythmia condition.

10. The ECG signal processing system of claim 1, wherein the telemetry circuitry is further configured to wirelessly provide the one or more output telemetry signals to the secondary ECG processing system.

11. The ECG signal processing system of claim 1, wherein conditioning the secondary ECG signal lead comprises at least one of performing noise filtering, performing signal amplification, and performing analog to digital conversion on the secondary ECG signal lead.

12. The ECG signal processing system of claim 1, further comprising one or more sensors configured to detect at least one of a cardio-vibrational signal, a pulmonary-vibrational signal, and a pulse oxygen level of the patient.

13. The ECG signal processing system of claim 1, wherein the secondary ECG processing system comprises one of a three ECG lead telemetry device, a six lead ECG monitoring device, and a twelve lead ECG monitoring device.

14. The ECG signal processing system of claim 1, further comprising at least two therapy electrodes configured to be placed proximate to the patient'"'"'s skin and further configured to deliver at least one therapeutic shock to the patient.

15. The ECG signal processing system of claim 1, wherein the telemetry circuitry is isolated to protect the patient from environmental electrical noise.

16. An ambulatory medical device, comprising:

a plurality of electrocardiogram (ECG) sensing electrodes configured to be in substantially continuous contact with a patient'"'"'s skin over an extended period of time and detect at least one raw ECG signal lead of the patient;

an ECG monitoring circuitry coupled to the plurality of ECG sensing electrodes and configured to determine one or more cardiac arrhythmia conditions in the patient;

an ECG pre-processing circuitry operably connected to the plurality of ECG sensing electrodes and configured to

receive the at least one raw ECG signal lead via the plurality of ECG sensing electrodes; and

process the at least one raw ECG signal lead to produce a primary ECG signal lead and a secondary ECG signal lead split from the primary ECG signal lead such that the secondary ECG signal lead is substantially the same as the primary ECG signal lead;

a first ECG signal conditioning circuitry configured to condition the primary ECG signal lead and provide the conditioned primary ECG signal lead to the ECG monitoring circuitry, the ECG monitoring circuitry being configured to determine the one or more cardiac arrhythmia conditions in the patient based on the conditioned primary ECG signal lead;

a second ECG signal conditioning circuitry configured to be electrically isolated from the primary ECG signal conditioning circuitry and configured to condition the secondary ECG signal lead; and

a telemetry circuitry electrically coupled to the second ECG signal conditioning circuitry, the telemetry circuitry comprising telemetry output connectors configured to provide one or more output telemetry signals based on the conditioned secondary ECG signal lead to secondary ECG monitoring circuitry.

17. The ambulatory medical device of claim 16, wherein the telemetry circuitry further comprises:

a telemetry input configured to receive the conditioned secondary ECG signal lead and at least one input from the ECG monitoring circuitry; and

telemetry simulation circuitry configured to simulate one or more ECG signal conditions of the patient based on the conditioned secondary ECG signal lead and the at least one input from the ECG monitoring circuitry.

18. The ambulatory medical device of claim 17, wherein the telemetry simulation circuitry further comprises one or more relays to disconnect the telemetry circuitry from the plurality of telemetry output connectors in response to the at least one input from the ECG monitoring circuitry.

19. The ambulatory medical device of claim 16, wherein the at least one raw ECG signal lead comprises a plurality of raw ECG signal leads, and the telemetry circuity is configured to provide a plurality of output telemetry signals corresponding to each one of the plurality of raw ECG signal leads of the patient.

20. The ambulatory medical device of claim 16, wherein the second ECG conditioning circuitry is further configured to filter out one or more electrical signals applied to the patient by the ECG monitoring circuitry.

21. The ambulatory medical device of claim 16, wherein the telemetry circuitry further comprises a patient model comprising a resistor network configured to model one or more electrical parameters of the patient.

22. The ambulatory medical device of claim 21, wherein the telemetry circuitry is further configured to simulate the one or more ECG signal conditions by directing the conditioned secondary ECG signal lead through the resistor network.

23. The ambulatory medical device of claim 22, wherein the simulated one or more ECG signal conditions comprise a noise condition and an arrhythmia condition.

24. The ambulatory medical device of claim 16, wherein the telemetry circuitry is further configured to wirelessly provide the one or more output telemetry signals to the secondary ECG monitoring circuitry.

25. The ambulatory medical device of claim 16, wherein conditioning the secondary ECG signal lead comprises at least one of performing noise filtering, performing signal amplification, and performing analog to digital conversion on the secondary ECG signal lead.

26. The ambulatory medical device of claim 16, further comprising one or more sensors configured to detect at least one of a cardio-vibrational signal, a pulmonary-vibrational signal, and a pulse oxygen level of the patient.

27. The ambulatory medical device of claim 16, wherein the secondary ECG monitoring circuitry comprises one of a three ECG lead telemetry device, a six ECG lead telemetry device, and a twelve ECG lead telemetry device.

28. The ambulatory medical device of claim 16, further comprising at least two therapy electrodes configured to be placed proximate to the patient'"'"'s skin and further configured to deliver at least one therapeutic shock to the patient.

29. A signal processing system, comprising:

at least one physiological sensor configured to be placed proximate to a patient'"'"'s skin and detect at least one raw physiological signal of the patient; and

a physiological signal processing node device comprising

physiological signal pre-processing circuitry operably connected to the at least one physiological sensor and configured to

receive the at least one raw physiological signal via the at least one physiological sensor; and

process the at least one raw physiological signal to produce a first physiological signal and a second physiological signal that is substantially the same as the first physiological signal;

first physiological signal conditioning circuitry configured to condition the first physiological signal and provide the conditioned first physiological signal to a primary patient monitoring device;

second physiological signal conditioning circuitry configured to be electrically isolated from the first physiological signal conditioning circuitry and configured to condition the second physiological signal; and

telemetry circuitry electrically coupled to the second physiological signal conditioning circuitry, the telemetry circuitry comprising a telemetry input configured to receive the conditioned second physiological signal;

telemetry simulation circuitry configured to simulate one or more physiological conditions of the patient based on the conditioned second physiological signal; and

a plurality of telemetry output connectors configured to provide one or more output telemetry signals based on the simulated one or more physiological signal conditions of the patient to a secondary physiological signal processing system.

30. The signal processing system of claim 29, wherein the telemetry simulation circuitry comprises one or more relays to disconnect the telemetry circuitry from the plurality of telemetry output connectors in response to at least one input from the primary patient monitoring device.

31. The signal processing system of claim 29, wherein the second physiological signal conditioning circuitry is further configured to filter out one or more electrical signals applied to the patient by the primary patient monitoring device.

32. The signal processing system of claim 29, wherein the telemetry circuitry is configured to receive at least one input from the primary patient monitoring device.

33. The signal processing system of claim 32, wherein the telemetry simulation circuitry is further configured to simulate the one or more physiological conditions of the patient based on the conditioned second physiological signal and the at least one input from the primary patient monitoring system.

34. The signal processing system of claim 33, further comprising a plurality of electrocardiogram (ECG) sensing electrodes configured to be placed proximate to a patient'"'"'s skin and detect at least one raw ECG signal lead of the patient, and wherein the telemetry simulation circuitry is further configured to simulate one or more ECG signal conditions of the patient, and wherein the telemetry output connectors are further configured to provide the one or more output telemetry signals based on the simulated one or more ECG signal conditions of the patient.