WO1998019596A1 - System and method for monitoring a heartbeat - Google Patents
System and method for monitoring a heartbeat Download PDFInfo
- Publication number
- WO1998019596A1 WO1998019596A1 PCT/GB1997/003024 GB9703024W WO9819596A1 WO 1998019596 A1 WO1998019596 A1 WO 1998019596A1 GB 9703024 W GB9703024 W GB 9703024W WO 9819596 A1 WO9819596 A1 WO 9819596A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- heartbeat
- filter
- monitor system
- frequencies
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P13/00—Indicating or recording presence, absence, or direction, of movement
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
- A61B5/1102—Ballistocardiography
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
- A61B5/113—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb occurring during breathing
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
- A61B2562/16—Details of sensor housings or probes; Details of structural supports for sensors
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6887—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient mounted on external non-worn devices, e.g. non-medical devices
- A61B5/6891—Furniture
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6887—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient mounted on external non-worn devices, e.g. non-medical devices
- A61B5/6892—Mats
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7203—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal
- A61B5/7207—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal of noise induced by motion artifacts
Definitions
- the present invention relates to a system and method for monitoring the heartbeat of a living being without having to be fitted to the living being, in particular when the living being is a baby.
- medical staff monitor the patients under their care for any change relating to their well being. Monitoring a heartbeat of a new born baby can alert staff immediately to medical problems, such as a potential cot death incident.
- Such systems must be capable of being applied to a number of living beings simultaneously, for instance in a hospital ward where a number of cots or beds would be present.
- Monitoring systems have been developed which use various types of sensors which are connected to the body of the living being. The sensors are then typically connected to a suitable form of processing facility. However, in such systems it is inconvenient to have to attach and detach the living being from the sensors when they are moved. Also, the attachment of sensors to a baby invariably requires the use of wires which may become entangled in with the baby's limbs or around a baby's neck.
- GB 2,150,332 discloses a heartbeat monitor which is attached to the chest of a baby, for example by being fitted in a pocket of a close fitting vest which pocket lies over the chest of the baby.
- the monitor comprises a microphone for picking up cardiac sounds and avoids the use of wires to connect the monitor to a processing facility by using a radio link.
- this system would not immediately be able to detect the removal of a baby from a cot or pram by an unauthorised person and has the inconvenience of having to repeatedly fit the monitor to a baby.
- Equipment for monitoring a heartbeat has to be able to detect a signal having a very short pulse duration and if the sensor is not directly fitted to the living being will have to pick out the heartbeat signal of very small amplitude from a lot of background movement or noise including movement or noises made by the living being, such as breathing, vocal noises and limb movements an well as movement or noises emanating from the surroundings of the living being.
- GB 2,165,979 discloses a monitor apparatus which describes a system which monitors breathing by sensing pressure changes in an air envelope on which a baby rests.
- the air envelope is designed to couple the signal of interest which may also comprise a heartbeat to a transducer which communicates with the air pocket.
- GB 2,165,979 does not disclose in detail how the air envelope is designed to discriminate between the signal of interest and other movement or noises occurring in the local environment.
- the transducer signal is amplified, rectified and integrated and then the resultant signal is compared with a control signal. If the resultant signal drops below the control signal for a predetermined period of time then an alarm is activated.
- the present invention provides a monitor system for monitoring the heartbeat of a living being, comprising a transducer responsive to the heartbeat to generate a heartbeat signal, a filter for filtering the heartbeat signal and processing circuitry to process the filtered signal, characterised in that the system comprises an oscillating element responsive to the heartbeat signal to generate a sinusoidal signal of decaying amplitude having a half cycle which approximates to the heartbeat signal and the filter passes only those frequencies in a selected range close to the frequency of the sinusoidal signal generated by the oscillating element.
- the monitor system is capable of reliably distinguishing the heartbeat signal from a composite signal including signals generated by other noises or movements.
- the sinusoidal signal generated by the oscillator element will pass through the filter to the processing circuitry. If the heartbeat stops the sinusoidal signal generated by the oscillator element will decay to zero and so the amplitude of the signal passing through the filter to the processing circuitry will drop.
- the processing circuitry can be arranged to set off an alarm when the signal passing from the filter drops below a predetermined level.
- the oscillating element is an electrical resonator circuit with a gain of less than unity.
- the senor comprises a transducer responsive to the heartbeat to generate an electrical heartbeat signal.
- the oscillating element may be an electrical resonator circuit, for example an active filter, with a gain approaching unity such that the oscillations generated by the oscillator element decay slowly.
- the oscillating element and the filter comprise an active filter.
- an active filter When exited, an active filter will oscillate at the frequencies within the bandwidth of the filter and so can perform both the functions of the oscillating element and the filter.
- the electrical heartbeat signal Before reaching the oscillator element and/or filter it is preferred to pass the electrical heartbeat signal through a high pass filter which passes frequencies greater than approximately 5 to 7.5 Hz and so blocks lower frequencies in order to prevent swamping of the low amplitude heartbeat signal by high amplitude breathing and/or limb movement signals.
- the active filter comprises; a first filter which passes frequencies below the bottom end of the selected range of frequencies, a second filter which passes frequencies below the top end of the selected range of frequencies, and a subtraction element for subtracting the first signal from the second signal.
- the oscillating element comprises a mechanical oscillator.
- a flexible board can be designed so that it oscillates in response to a heartbeat signal so that a piezo device fixed to the board generates a sinusoidal signal of decaying amplitude having a half cycle which approximates to the heartbeat signal.
- the baby's heartbeat can provide a regular stimulus to maintain the oscillation of the board.
- the oscillations form a ⁇ continuous sinusoidal signal so long as the heartbeat is present and so are much easier to detect than the short duration intermittent pulse of the heartbeat.
- the filter can comprise a mechanical filter, for example if a board as described above has a resonant frequency close to that of a sinusoidal signal having a half cycle which approximates to the heartbeat signal, it will transmit that frequency in preference to other frequencies and hence act as a filter.
- the electrical signal generated by the transducer preferably passes through at least one DC amplification stage.
- the oscillator element is preferably responsive to and the filter preferably passes frequencies in the range of 6.8Hz to 20Hz.
- the selected range of frequencies are preferably centred on a frequency of between 10 and 15Hz, preferably 12.5Hz.
- the processing circuitry comprises a threshold detector which activates an alarm when a signal passed through the filter rises or falls past a pre-set threshold. More preferably, the threshold detector comprises a comparator for comparing the signal passed by the filter with a control signal.
- the monitor system also detects other forms of physical activity associated with a living being to generate a signal which is passed to the processing circuitry.
- the processing circuitry is responsive to all the signals it receives when generating a signal to actuate an alarm.
- monitor system for monitoring the heartbeat of a living being, comprising a transducer responsive to the heartbeat to generate a heartbeat signal, a filter for filtering the heartbeat signal and processing circuitry to process the filtered signal, characterised in that the system comprises an oscillating element responsive to the heartbeat signal to generate a sinusoidal signal of decaying amplitude having a frequency in a selected range of- frequencies centred on a frequency of between 10 and 15 Hz, preferably 12.5Hz and the filter passes frequencies in a selected range centred between 10 and 15Hz, preferably 12.5Hz.
- a method for monitoring the heartbeat of a living being, remote from the living being including the steps of: generating a heartbeat signal from a sensed heartbeat movement, filtering the heartbeat signal, and processing the filtered signal, characterised in that the method further comprises the steps of: generating a sinusoidal oscillation in response to the heartbeat signal which sinusoidal oscillation has a decaying amplitude and a half cycle which approximates to the heartbeat signal, and filtering only those frequencies in a selected range close to the frequency of the sinusoidal oscillation generated by the oscillating element.
- Figure 1 shows schematically an embodiment of a system for monitoring a heartbeat of a living being
- Figure 2 shows the electronic circuitry used to process the signals from a transducer to distinguish between various forms of physical activity, including a heartbeat, associated with a living being;
- Figure 3 shows a plurality of signals associated with the circuitry of Figure 2; and Figures 4a to 4d schematically illustrate embodiments of support boards on which ' a transducer is mounted.
- FIG. 1 there is shown a schematic embodiment of a monitor system (10) for detecting physical activity, including heartbeat, associated with a baby.
- a cot (20) for a baby has underneath the mattress (30) a transducer arrangement (40).
- the transducer arrangement is exited by one or more physical activities associated with a baby, such as a heartbeat, breathing or limb movement, and produces a signal having components derived from or related to any such physical activities.
- the transducer arrangement (40) is coupled, via a suitable signal transmission medium to a cot unit (50).
- the cot unit (50) comprises circuitry for processing the signals received from the transducer arrangement (40) to distinguish between various forms of physical activity emanating from or associated with a baby in the cot (20).
- the cot unit (50) is, directly or indirectly, connected to and can trigger the activation of an alarm (60) in the event that the signal from the transducer arrangement (40) indicates that at least a selectable one of a plurality of physical activities associated with the baby has changed or terminated.
- the cot unit (50) may activate an alarm if a determination is made to the effect that the signal no longer contains a component indicative of heartbeat.
- Various thresholds can be set which monitor not only the presence of a particular component of the signal but also the level or rate of that component.
- the alarm (60) is typically located in a central location where it has a high probability of attracting the attention of a responsible adult during home use or nursing staff for hospital use.
- the alarm (60) may produce an audio output or a visual indication, for example, where it is undesirable to disturb other babies or patients in a hospital.
- the transducer arrangement comprises a suitably flexible support board (70) (see Figures 4a to 4d) having a piezo-ceramic device (80) centrally disposed thereon which produces a voltage when stressed or flexed.
- the piezo-ceramic device (80) is in the form of a disc.
- the support board (70) is constructed, for example, a flexible- plastic board as shown in Figure 1. Manufacturing the board from a suitable plastic can increase the sensitivity of the transducer arrangement as a whole to the physical activities of a baby.
- the support board is made from ABS plastic due to the low cost and ability to shape and work the plastic.
- Alternative embodiments can be realised in which the flexible board is manufactured from metal, fibre board, hard board or other forms of plastic.
- mechanical means are utilised which increase the sensitivity of the transducer arrangement to the movement of the mattress or baby by locating a fulcrum (96) for the support board (70) directly below the piezo-electric element.
- the flexible support board such as that shown in figure 4a can be designed so that it oscillates in response to a heartbeat signal so that the piezo device generates a sinusoidal signal of decaying amplitude having a half cycle which approximates to the heartbeat signal.
- the baby's heartbeat can provide a regular stimulus to maintain the oscillation.
- the oscillations form a continuous sinusoidal signal so long as the heartbeat is present and so are much easier to detect than the short duration intermittent pulse of the heartbeat.
- the support board (70) is formed with, for example, a plurality of discontinuities, such as slots (90) (see Figures 4b to 4d).
- the support board (70) utilises an arrangement of grooves on at least one of either the top or bottom surfaces thereof. The discontinuities ensure that the board is flexible and so will readily distort in response to the physical activities of the baby but is also strong enough to support the mattress and the baby.
- the slots (90) are radially disposed with respect to a central portion of the support (70) board where the piezo device (80) is located.
- a further embodiment ( Figure 4d) also comprises further slots (90) disposed around the periphery of the support board (70).
- the support board (70) comprises a total of eight slots having at the ends thereof a hole which reduces the stresses conventionally associated with the slots.
- the support board (70) is generally rectangular although other shapes are also possible, for example square or circular. Still further, a plurality of support boards may be utilised having piezo devices connected therebetween which produce electrical signals in response to relative movement of the support boards.
- the lower surface of the support board (70) is held in an elevated position above and not in contact with the bottom of the cot. This enables the support board to deform independently of the rigid surface of the bottom of the cot and so increases its sensitivity to physical activity. Also, in certain embodiments it will enable the board to oscillate.
- the degree by which the plastic support board (70) can flex is increased by using strategically placed feet (95) (shown in dotted lines) arranged to support the support board (70) such that movement thereof is not impeded by, for example, the bottom of the cot.
- the feet (95) are regularly disposed around the periphery of the support board (70) and one foot (96) is centrally disposed so as to provide a fulcrum support for the piezo device. Therefore, as the baby moves, including breathing and heartbeat movements, the board flexes which, in turn, causes the piezo device to produce a signal indicative of such movement.
- the piezo device is situated at the position on the support board (70) which flexes the most and therefore stressed the piezo device the most. This position has been found to be typically the centre of the board, particularly if a fulcrum support is provided at the centre of the board.
- the feet are omitted.
- the plastic support board is supported at its edges by the frame of the cot such that the board if free to flex or oscillate and such movement is not impeded by the bottom surface, if any, of the cot.
- the monitoring system according to the present invention will detect all voluntary and involuntary movements of the living being, however, during deep sleep, the only physical activities which are present are the breathing and the heartbeat.
- the support board (70) comprises a removable protective covering (not shown) to guard against damage, for example, by bodily or other fluids.
- the piezo-ceramic device (80) is connected to the cot unit (50) using co-axial cable (100).
- Co-axial cable is preferred as it is less susceptible to mains interference than most cables.
- suitable screened twisted pair may be utilised.
- FIG. 2 there is shown a diagram of a circuit (200) implementing detection means for distinguishing between various components, including heartbeat, of the signal derived from the transducer arrangement (40).
- the circuit (200) detects signals in two main bandwidths of interest.
- a first circuit (202) determines whether or not the signal from the transducer arrangement (40) contains a component indicative of or derived from breathing or limb movement.
- a second circuit (204) determines whether or not the signal from the transducer arrangement contains a component indicative of or derived from the heartbeat of the baby.
- the piezo device (80) is connected in parallel with a 20 M ohm resistor (206), to a DC- voltage amplifier (208).
- the amplifier is arranged to amplify the DC component of the signal from the piezo device by a factor of fifteen.
- the first circuit (202) comprises a 5 th order low pass filter (210) designed to pass frequencies less than or equal to approximately one hertz, more particularly, frequencies below between a quarter of one hertz and one hertz.
- the breathing and other low frequency signals are passed by the 5 th order low pass filter (210).
- a DC correction is added to the signal from the DC amplifier (208) to counteract the DC signal offset introduced to the signal when it passes through the amplifier (208) and the low pass filter (210).
- the DC correction is generated in a conventional way by amplifying the signal from the low pass filter (210) by a factor of ten using a further DC amplifier (212) and then using an integrator (214) having an open loop gain and an RC time constant of five seconds.
- a feedback resistor (216) is utilised to provide a feedback current of +/- 2 micro-amps.
- the resistor is a 10 M ohm resistor and the capacitor is a 0.47 microfarad capacitor.
- a threshold detector (218) is used to ultimately determine whether or not the output from the low pass filter (210) is indicative of the presence of breathing or limb movement.
- the threshold detector can be realised as a single comparator using an Op-amp (222) with controlled positive feedback (224) to provide the threshold and the stability of a Shmitt trigger circuit to eliminate false signals.
- the output (220) of the threshold detector is connected to a microprocessor or other processing circuit within the cot unit (50) for further processing.
- circuitry for the detection of a heartbeat The output from the DC amplifier (208) is fed to a high pass passive filter (226) which passes all signals having a frequency of five hertz or greater. This high pass filter blocks low frequencies and so prevents the low amplitude heartbeat signal from being swamped by the high amplitude breathing and limb movement signals. It also isolates subsequent circuitry from the DC offset signal generated when the signal passed through the amplifier 208.
- the output of the high pass filter (226) is amplified by a factor of two using a DC amplifier (228).
- the output of the DC amplifier (228) is fed to an active band-pass filter (230) which acts as an oscillating element which because of the bandwidth selected is responsive to the heartbeat signal to generate a sinusoidal signal of decaying amplitude having a half cycle which approximates to the heartbeat signal.
- the filter (230) passes this oscillation. Because the band-pass filter (230) is an active filter when it is exited it will oscillate at the frequencies within the bandwidth of the filter. The bandwidth is selected to incorporate those frequencies that correspond to twice the duration of a typical heartbeat pulse.
- the heartbeat signal is shown at (a).
- this signal (a) enters the active band-pass filter (230) it will be masked by other signals associated with physical activity of the baby.
- Each pulse of the heartbeat signal (a) has a duration of (T) which will vary to some extent from baby to baby. Therefore, the active band-pass filter (230) is set to pass a bandwidth centred on a frequency of l/(2t), where t is the typical duration of a baby's heartbeat pulse.
- a signal having a heartbeat signal component (a) enters the filter (230) it will cause the filter to oscillate at the frequency of 1/(2T) and so will generate a sinusoidal oscillation shown at (b) in Figure 3 which sinusoidal oscillation is passed by the filter (230) and has a frequency of 1/(2T).
- the active filter (230) acts as an oscillator with a gain of less than one and so between heartbeats the sinusoidal oscillation (b) will decay. However, each time a heartbeat pulse enters the filter, the sinusoidal oscillation will be reinforced, as shown in figure 3.
- the active band-pass filter (230) is responsive to a heartbeat signal (a) to generate a sinusoidal signal (b) of decaying amplitude having a half cycle (shaded portion in signal (b)) which approximates to the heartbeat signal (shaded portion in signal (a)) and passes only those frequencies in a selected range close to the frequency of the sinusoidal signal generated by the filter (230).
- the sinusoidal oscillation generated by one heartbeat pulse is still detectable when the filter (230) is exited by the next heartbeat pulse as shown in the signal (b) in Figure 3.
- the amplitude decay profile (330) is such that the signal decays to " zero within a few seconds.
- the short duration pulses of the heartbeat signal (a), which are difficult to detect are used to generate a continuous sinusoidal signal which endures as long a heartbeat signal is present and so is easier to detect.
- the active band-pass filter (230) has been implemented using two low-pass filters.
- the first low pass filter (232) is arranged to pass frequencies of less than 6.8 Hz while the second low pass filter (234) is arranged to pass frequencies of less than 20 Hz.
- the active band-pass filter (230) is constructed by inverting the output of the first low pass filter (232) and combining the inverted signal with the output of the second low pass filter in order to cancel all signal frequencies except those between 6.8 Hz and 20 Hz which are thus passed by the filter (230).
- the frequency range 6.8Hz to 20Hz corresponds to a range of durations for a heartbeat pulse which are typical for a baby.
- a threshold detector (236) is used to ultimately determine whether or not the output from the active filter (230) is indicative of the presence of a heartbeat.
- the threshold detector can be realised as a single comparitor using an Op-amp (238) and a voltage divider (240) comprising two resistors to set the threshold level.
- the output (250) of the threshold detector is connected to electronic circuitry or a microprocessor within the cot unit (50) for further processing.
- the electronic circuitry or microprocessor is suitably designed or programmed to determine whether or not it is necessary to sound the alarm.
- the presence or absence of the signals relating to heartbeat, breathing or limb movement can be utilised foF monitoring the health of the baby or simply for monitoring whether or not the baby is present in the cot.
- the alarm may be sounded as soon as a determination has been made that the breathing/limb movement and/or heartbeat signals are not present.
- microprocessor and or electronic processing circuitry can be provided within the cot unit (50). However, other embodiments can be realised in which the processing is performed remotely by, for example, a computer.
- the cot unit (50) is connected via communication link (102) to a computer or a system controller (107). Also, a relay output unit (110) is provided under the control of the cot unit (50) and/or the system controller (107) to perform various functions, such as to lock the doors to a maternity ward to prevent a baby being stolen, send a signal to a pager informing the holder of the pager of the problem, or to sound an alarm.
- the system controller (107) receives and displays status information associated with a plurality of cots, each having its own transducer arrangement (40) and associated cot unit (50).
- the cot units (50) and the system controller (107) can operate an alarm independently. If the system controller (107) does not receive an appropriate response after interrogating a cot unit (50) via the communication link (102) it will go into alarm immediately. Likewise each cot unit (50) detects or monitors interrogation by the system controller (107) and will sound an alarm if it fails to be interrogated regularly. This will highlight hardware failure and guard against leads being cut.
- a security device such as a magnetic swipe card device (112) or a security key-pad device.
- the cot unit can then also incorporate a radio transmitter which transmits a radio signal carrying the audible sounds plus any alarm signal to a remote radio receiving unit which also incorporates a loud speaker.
- the receiving unit is mobile and can be carried by and located in the neighbourhood of an adult responsible for the baby. Therefore, if the baby cries, the crying noise will be transmitted by the receiving unit and the responsible adult can act appropriately. Further, if the heartbeat, breathing and/or limb movement activity of the baby ceases an audible alarm signal will be emitted by the receiving unit to alert the responsible adult to the danger.
- the monitor system could be used to warn nursing staff when such patients get out of bed during the night.
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Heart & Thoracic Surgery (AREA)
- Molecular Biology (AREA)
- Dentistry (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Physiology (AREA)
- Medical Informatics (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Cardiology (AREA)
- General Physics & Mathematics (AREA)
- Measuring And Recording Apparatus For Diagnosis (AREA)
- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU48744/97A AU735569B2 (en) | 1996-11-06 | 1997-11-04 | System and method for monitoring a heartbeat |
EP97911329A EP0938274A1 (en) | 1996-11-06 | 1997-11-04 | System and method for monitoring a heartbeat |
CA002269713A CA2269713A1 (en) | 1996-11-06 | 1997-11-04 | System and method for monitoring a heartbeat |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9623077.6A GB9623077D0 (en) | 1996-11-06 | 1996-11-06 | System and method for monitoring physical activity |
GB9623077.6 | 1996-11-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998019596A1 true WO1998019596A1 (en) | 1998-05-14 |
Family
ID=10802514
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1997/003024 WO1998019596A1 (en) | 1996-11-06 | 1997-11-04 | System and method for monitoring a heartbeat |
PCT/GB1997/003025 WO1998019597A1 (en) | 1996-11-06 | 1997-11-04 | Sensor arrangement for monitoring physical activity |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1997/003025 WO1998019597A1 (en) | 1996-11-06 | 1997-11-04 | Sensor arrangement for monitoring physical activity |
Country Status (6)
Country | Link |
---|---|
EP (2) | EP0938274A1 (en) |
AU (2) | AU735569B2 (en) |
CA (2) | CA2269712A1 (en) |
GB (1) | GB9623077D0 (en) |
WO (2) | WO1998019596A1 (en) |
ZA (2) | ZA979924B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000021048A1 (en) * | 1998-10-01 | 2000-04-13 | Pedro Monagas Asensio | Alert and detection device for monitoring the physical status of babies and handicapped persons as well as their usual environment |
EP1815787A1 (en) * | 2004-11-02 | 2007-08-08 | A.T. Labo, Co., Ltd. | Heartbeat/respiration sensor and body monitor employing same |
WO2020193812A1 (en) * | 2019-03-28 | 2020-10-01 | Paris Sciences Et Lettres - Quartier Latin | Ballistocardiography device and method |
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US3413573A (en) * | 1965-06-18 | 1968-11-26 | Westinghouse Electric Corp | Microelectronic frequency selective apparatus with vibratory member and means responsive thereto |
GB2150332A (en) | 1983-10-06 | 1985-06-26 | Tranter Michael John | Heartbeat monitor |
GB2165979A (en) | 1984-10-12 | 1986-04-23 | John Michael Wood | Monitor apparatus |
US4657025A (en) * | 1981-12-09 | 1987-04-14 | Carl Orlando | Heart and breathing alarm monitor |
DE4001574A1 (en) * | 1990-01-20 | 1991-07-25 | Walz Elektronik Gmbh | Vital organ's functioning tester for new born baby - has contactless pick=up providing signals subjected to Fourier transformation so that upper harmonics of heart beat can be evaluated |
US5479932A (en) * | 1993-08-16 | 1996-01-02 | Higgins; Joseph | Infant health monitoring system |
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US4595023A (en) * | 1981-11-16 | 1986-06-17 | Kenneth Bonnet | Apparatus and method for detecting body vibrations |
GB2192460B (en) | 1986-07-08 | 1990-08-01 | John Keith Millns | Respiratory movement sensing assemblies and apparatus |
WO1991019456A1 (en) * | 1990-06-14 | 1991-12-26 | Lesbar Pty Limited | Respiratory monitor |
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1996
- 1996-11-06 GB GBGB9623077.6A patent/GB9623077D0/en active Pending
-
1997
- 1997-11-04 AU AU48744/97A patent/AU735569B2/en not_active Ceased
- 1997-11-04 EP EP97911329A patent/EP0938274A1/en not_active Withdrawn
- 1997-11-04 WO PCT/GB1997/003024 patent/WO1998019596A1/en not_active Application Discontinuation
- 1997-11-04 EP EP97911330A patent/EP0938275A1/en not_active Withdrawn
- 1997-11-04 CA CA002269712A patent/CA2269712A1/en not_active Abandoned
- 1997-11-04 WO PCT/GB1997/003025 patent/WO1998019597A1/en not_active Application Discontinuation
- 1997-11-04 AU AU48745/97A patent/AU737561B2/en not_active Ceased
- 1997-11-04 CA CA002269713A patent/CA2269713A1/en not_active Abandoned
- 1997-11-05 ZA ZA979924A patent/ZA979924B/en unknown
- 1997-11-05 ZA ZA979926A patent/ZA979926B/en unknown
Patent Citations (6)
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US3413573A (en) * | 1965-06-18 | 1968-11-26 | Westinghouse Electric Corp | Microelectronic frequency selective apparatus with vibratory member and means responsive thereto |
US4657025A (en) * | 1981-12-09 | 1987-04-14 | Carl Orlando | Heart and breathing alarm monitor |
GB2150332A (en) | 1983-10-06 | 1985-06-26 | Tranter Michael John | Heartbeat monitor |
GB2165979A (en) | 1984-10-12 | 1986-04-23 | John Michael Wood | Monitor apparatus |
DE4001574A1 (en) * | 1990-01-20 | 1991-07-25 | Walz Elektronik Gmbh | Vital organ's functioning tester for new born baby - has contactless pick=up providing signals subjected to Fourier transformation so that upper harmonics of heart beat can be evaluated |
US5479932A (en) * | 1993-08-16 | 1996-01-02 | Higgins; Joseph | Infant health monitoring system |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000021048A1 (en) * | 1998-10-01 | 2000-04-13 | Pedro Monagas Asensio | Alert and detection device for monitoring the physical status of babies and handicapped persons as well as their usual environment |
ES2150381A1 (en) * | 1998-10-01 | 2000-11-16 | Asensio Pedro Monagas | Alert and detection device for monitoring the physical status of babies and handicapped persons as well as their usual environment |
EP1815787A1 (en) * | 2004-11-02 | 2007-08-08 | A.T. Labo, Co., Ltd. | Heartbeat/respiration sensor and body monitor employing same |
EP1815787A4 (en) * | 2004-11-02 | 2009-04-08 | A T Labo Co Ltd | Heartbeat/respiration sensor and body monitor employing same |
WO2020193812A1 (en) * | 2019-03-28 | 2020-10-01 | Paris Sciences Et Lettres - Quartier Latin | Ballistocardiography device and method |
FR3094199A1 (en) * | 2019-03-28 | 2020-10-02 | Paris Sciences Et Lettres - Quartier Latin | BALLISTOCARDIOGRAPHY DEVICE AND METHOD |
Also Published As
Publication number | Publication date |
---|---|
GB9623077D0 (en) | 1997-01-08 |
AU4874597A (en) | 1998-05-29 |
CA2269713A1 (en) | 1998-05-14 |
EP0938275A1 (en) | 1999-09-01 |
AU737561B2 (en) | 2001-08-23 |
ZA979926B (en) | 1999-06-29 |
AU735569B2 (en) | 2001-07-12 |
ZA979924B (en) | 1999-06-29 |
AU4874497A (en) | 1998-05-29 |
EP0938274A1 (en) | 1999-09-01 |
CA2269712A1 (en) | 1998-05-14 |
WO1998019597A1 (en) | 1998-05-14 |
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