WO2000076396A1 - Power saving leads status monitoring - Google Patents

Power saving leads status monitoring Download PDF

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Publication number
WO2000076396A1
WO2000076396A1 PCT/AU2000/000657 AU0000657W WO0076396A1 WO 2000076396 A1 WO2000076396 A1 WO 2000076396A1 AU 0000657 W AU0000657 W AU 0000657W WO 0076396 A1 WO0076396 A1 WO 0076396A1
Authority
WO
WIPO (PCT)
Prior art keywords
mode
contact means
interrupt signal
sleep mode
wake
Prior art date
Application number
PCT/AU2000/000657
Other languages
French (fr)
Inventor
Harry Louis Platt
Vladimir Jankov
Original Assignee
Shell, Allan, Michael
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shell, Allan, Michael filed Critical Shell, Allan, Michael
Priority to EP00934816A priority Critical patent/EP1199982A4/en
Priority to AU50551/00A priority patent/AU5055100A/en
Publication of WO2000076396A1 publication Critical patent/WO2000076396A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/316—Modalities, i.e. specific diagnostic methods
    • A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
    • A61B2560/02—Operational features
    • A61B2560/0204—Operational features of power management
    • A61B2560/0209—Operational features of power management adapted for power saving
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/25—Bioelectric electrodes therefor
    • A61B5/276—Protection against electrode failure

Definitions

  • the present invention relates to the field of battery operated devices such as devices used for monitoring a cardiac patient's electrical cardiac activity and, in particular, to the operation of a power saving or sleep mode of an ECG acquisition system.
  • microcontrollers of devices such as as ECG monitors, use a sleep mode whereby a minimal amount of energy is consumed from the battery.
  • one of the important requirements is signal quality monitoring. If leads of the device are disconnected from a patient, no ECG can be acquired and the device can save power by using a sleep mode.
  • the patient's compliance also dictates continuous monitoring of the leads status in sleep mode in order to automatically activate the device upon disconnection or connection of the leads.
  • Such a task requires at least some of the elements, such as front-end amplifiers, to be operational in sleep mode which means that there is an undesirable power drain from the batteries of known devices.
  • a method of operating an acquisition and monitoring device which uses contact means to detect and acquire signals, said device having a sleep mode, a wake mode and an operational mode, said method including the steps of providing an auxiliary oscillator in said device to provide a periodic interrupt signal to wake the device from the sleep mode to the wake mode where power is supplied to the device is minimal, testing connection of contact means to said device after receipt of said periodic interrupt signal, initiating the sleep mode if no connection of contact means is detected or initiating the operational mode if connection of contact means is detected.
  • the auxiliary oscillator is a low power, low frequency oscillator.
  • the interrupt signal turns on front end amplifiers of said device and has a period of about 2 seconds.
  • the test execution time is about 0.005 seconds.
  • Fig. 1 is a flow chart of the method of operation an acquisition and monitoring device.
  • the method according to the power saving system of the preferred embodiment uses a "sleep-wakeup-check-sleep" sequence for automatic activation of an ECG acquisition and monitoring device.
  • a "sleep-wakeup-check-sleep" sequence for automatic activation of an ECG acquisition and monitoring device.
  • the method includes the use of providing an auxiliary, low power, low frequency oscillator to generate an interrupt signal to "wake up" the microcontroller of the device.
  • the timeout of the interrupt signal is preferably set to occur every few seconds.
  • the microcontroller On the interrupt condition, ie when the interrupt signal is generated, the microcontroller switches on power for front end amplifiers of the device, waits for a short settling time, tests leads status, (ie whether there is contact or not), and then initiates sleep mode if the leads are not in contact. These routines are preferably performed in a very short time period in comparison to the interrupt timeout period.
  • the power saving system of the preferred embodiment monitors the status of the leads within periods defined by the interrupt timeout signals. With the interrupt timeout period being much longer than the time period of the leads status test, a sufficient ratio of sleep time to active time is achieved.
  • the ratio is 1 :40.

Abstract

A method of operating an acquisition and monitoring device which uses contact means to detect and acquire signals is disclosed. The device has a sleep mode, a wake mode and an operational mode, and the method includes the steps of providing an auxiliary oscillator in said device to provide a periodic interrupt signal to wake the device from the sleep mode to the wake mode where power supplied to the device is minimal, testing connection of contact means to said device after receipt of said periodic interrupt signal, initiating the sleep mode if no connection of contact means is detected or initiating the operational mode if connection of contact means is detected. Preferably, the auxiliary oscillator is a low power, low frequency oscillator and the interrupt signal turns on front end amplifiers of said device and has a period of about 2 seconds, while the test execution time is about 0.005 seconds.

Description

POWER SAVING LEADS STATUS MONITORING
The present invention relates to the field of battery operated devices such as devices used for monitoring a cardiac patient's electrical cardiac activity and, in particular, to the operation of a power saving or sleep mode of an ECG acquisition system.
BACKGROUND TO THE INVENTION
In battery operated devices, power consumption is a very important technical characteristic. In order to reduce power consumed by the device, microcontrollers of devices, such as as ECG monitors, use a sleep mode whereby a minimal amount of energy is consumed from the battery.
Often automatic initiation of such a sleep mode and activation of the microcontroller for power and energy saving purposes is based on special requirements and criteria associated with the functionality of the device.
In the case of the ECG acquisition device, one of the important requirements is signal quality monitoring. If leads of the device are disconnected from a patient, no ECG can be acquired and the device can save power by using a sleep mode.
Similarly, the patient's compliance also dictates continuous monitoring of the leads status in sleep mode in order to automatically activate the device upon disconnection or connection of the leads.
Such a task requires at least some of the elements, such as front-end amplifiers, to be operational in sleep mode which means that there is an undesirable power drain from the batteries of known devices.
It would be advantageous to provide a method and apparatus which provides a power supply arrangement which prevents an undesirable power drain. OBJECT OF THE INVENTION
It is an object of the present invention to provide a method and apparatus for power saving which substantially overcomes or ameliorates the above mentioned disadvantages.
DISCLOSURE OF THE INVENTION
According to one aspect of the present invention there is disclosed a method of operating an acquisition and monitoring device which uses contact means to detect and acquire signals, said device having a sleep mode, a wake mode and an operational mode, said method including the steps of providing an auxiliary oscillator in said device to provide a periodic interrupt signal to wake the device from the sleep mode to the wake mode where power is supplied to the device is minimal, testing connection of contact means to said device after receipt of said periodic interrupt signal, initiating the sleep mode if no connection of contact means is detected or initiating the operational mode if connection of contact means is detected.
Preferably, the auxiliary oscillator is a low power, low frequency oscillator.
Preferably, the interrupt signal turns on front end amplifiers of said device and has a period of about 2 seconds.
Preferably, the test execution time is about 0.005 seconds.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will be now be described with reference to the accompanying drawing in which:
Fig. 1 is a flow chart of the method of operation an acquisition and monitoring device. BEST MODE OF CARRYING OUT THE INVENTION
The method according to the power saving system of the preferred embodiment uses a "sleep-wakeup-check-sleep" sequence for automatic activation of an ECG acquisition and monitoring device. When such a device is used to monitor a patient, it is important for the device to know when the ECG leads are in contact with the patient's skin. If the leads are not in contact, the device is in a sleep mode.
The method includes the use of providing an auxiliary, low power, low frequency oscillator to generate an interrupt signal to "wake up" the microcontroller of the device. The timeout of the interrupt signal is preferably set to occur every few seconds.
On the interrupt condition, ie when the interrupt signal is generated, the microcontroller switches on power for front end amplifiers of the device, waits for a short settling time, tests leads status, (ie whether there is contact or not), and then initiates sleep mode if the leads are not in contact. These routines are preferably performed in a very short time period in comparison to the interrupt timeout period.
Thus the power saving system of the preferred embodiment monitors the status of the leads within periods defined by the interrupt timeout signals. With the interrupt timeout period being much longer than the time period of the leads status test, a sufficient ratio of sleep time to active time is achieved.
In the case where the timeout period is 2 seconds and the test execution time is 0.05 seconds, the ratio is 1 :40.
The foregoing describes only one embodiment of the present invention, and modifications obvious to those skilled in the art can be made thereto without departing from the scope of the present invention.

Claims

1. A method of operating an acquisition and monitoring device which uses contact means to detect and acquire signals, said device having a sleep mode, a wake mode and an operational mode, said method including the steps of providing an auxiliary oscillator in said device to provide a periodic interrupt signal to wake the device from the sleep mode to the wake mode where power is supplied to the device is minimal, testing connection of contact means to said device after receipt of said periodic interrupt signal, initiating the sleep mode if no connection of contact means is detected or initiating the operational mode if connection of contact means is detected.
2. The method of operating an acquisition and monitoring device according to claim 1, wherein the auxiliary oscillator is a low power, low frequency oscillator.
3. The method of operating an acquisition and monitoring device according to claim 1 , wherein the interrupt signal turns on front end amplifiers of said device and has a period of about 2 seconds.
4. The method of operating an acquisition and monitoring device according to claim 1 , wherein test execution time is about 0.005 seconds.
PCT/AU2000/000657 1999-06-10 2000-06-09 Power saving leads status monitoring WO2000076396A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP00934816A EP1199982A4 (en) 1999-06-10 2000-06-09 Power saving leads status monitoring
AU50551/00A AU5055100A (en) 1999-06-10 2000-06-09 Power saving leads status monitoring

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPQ0886 1999-06-10
AUPQ0886A AUPQ088699A0 (en) 1999-06-10 1999-06-10 Power saving leads status monitoring

Publications (1)

Publication Number Publication Date
WO2000076396A1 true WO2000076396A1 (en) 2000-12-21

Family

ID=3815080

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2000/000657 WO2000076396A1 (en) 1999-06-10 2000-06-09 Power saving leads status monitoring

Country Status (3)

Country Link
EP (1) EP1199982A4 (en)
AU (1) AUPQ088699A0 (en)
WO (1) WO2000076396A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003061465A2 (en) * 2002-01-22 2003-07-31 Gmp Wireless Medicine, Inc. Wireless ecg system
CN103799993A (en) * 2014-01-24 2014-05-21 东软熙康健康科技有限公司 Detection system and detection method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990006552A1 (en) * 1988-12-09 1990-06-14 Dallas Semiconductor Corporation Battery-initiated touch-sensitive power-up
US6026335A (en) * 1996-07-15 2000-02-15 Atlas; Dan Heart rate monitor with age-dependent target-zone feedback

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5226425A (en) * 1991-09-10 1993-07-13 Ralin, Inc. Portable ECG monitor/recorder
US5238001A (en) * 1991-11-12 1993-08-24 Stuart Medical Inc. Ambulatory patient monitoring system having multiple monitoring units and optical communications therebetween
US5476485A (en) * 1993-09-21 1995-12-19 Pacesetter, Inc. Automatic implantable pulse generator
US5746697A (en) * 1996-02-09 1998-05-05 Nellcor Puritan Bennett Incorporated Medical diagnostic apparatus with sleep mode
US6148233A (en) * 1997-03-07 2000-11-14 Cardiac Science, Inc. Defibrillation system having segmented electrodes

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990006552A1 (en) * 1988-12-09 1990-06-14 Dallas Semiconductor Corporation Battery-initiated touch-sensitive power-up
US6026335A (en) * 1996-07-15 2000-02-15 Atlas; Dan Heart rate monitor with age-dependent target-zone feedback

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1199982A4 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003061465A2 (en) * 2002-01-22 2003-07-31 Gmp Wireless Medicine, Inc. Wireless ecg system
WO2003061465A3 (en) * 2002-01-22 2003-12-04 Gmp Companies Inc Wireless ecg system
CN103799993A (en) * 2014-01-24 2014-05-21 东软熙康健康科技有限公司 Detection system and detection method

Also Published As

Publication number Publication date
AUPQ088699A0 (en) 1999-07-01
EP1199982A4 (en) 2004-05-19
EP1199982A1 (en) 2002-05-02

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