WO2006038074A1 - Respiratory monitor - Google Patents

Respiratory monitor

Info

Publication number
WO2006038074A1
WO2006038074A1 PCT/IB2005/002871 IB2005002871W WO2006038074A1 WO 2006038074 A1 WO2006038074 A1 WO 2006038074A1 IB 2005002871 W IB2005002871 W IB 2005002871W WO 2006038074 A1 WO2006038074 A1 WO 2006038074A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
unit
respiratory
signal
output
means
Prior art date
Application number
PCT/IB2005/002871
Other languages
French (fr)
Inventor
Nico Nuyts
Original Assignee
Melexis Nv
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

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/103Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/11Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
    • A61B5/113Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb occurring during breathing
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2562/00Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
    • A61B2562/02Details of sensors specially adapted for in-vivo measurements
    • A61B2562/0219Inertial sensors, e.g. accelerometers, gyroscopes, tilt switches
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/08Detecting, measuring or recording devices for evaluating the respiratory organs
    • A61B5/0803Recording apparatus specially adapted therefor

Abstract

Referring now to figures 1 and 2, a respiratory monitor comprises a detector unit (100) and a base unit (110). The detector unit is mounted on a subject’s chest or on clothing lying around a subject’s chest such that the detector unit moves in a phase with the respiratory movement of the subject. The detector unit (100) comprises an accelerometer (101), a processor (102), an RF signal generator (103), an RF aerial (104) and a power source (105). The output of the processor (102) is dependent upon the output of the accelerometer (101) and is output to the base unit (110) by the RF (signal) generator.

Description

RESPIRATQRY MONITOR

The invention relates to a respiratory monitor operable to detect respiration by monitoring movement of a subject's chest and in particular to such a device operable in conjunction with an alarm signal, said alarm signal being generated in response to a cessation of respiratory movement or some other change in respiratory movement and most particularly to such a device adapted to monitor the respiration of an infant.

Sudden Infant death Syndrome (SIDS) causes the deaths of many apparently healthy infants each year. Whilst some precautions can reduce the risk of the condition occurring, there is no precaution that can entirely prevent its occurrence. As a result, this condition is a source of great anxiety to most parents. Infant monitors were developed to provide reassurance to parents. Simple monitors comprise a microphone connected to a loudspeaker either by wires or more commonly by a wireless link. The microphone is placed near the infant and the loudspeaker is placed near the parent thus allowing the parent to hear the infant breathing. Such monitoring devices require the parent to continuously listen to the loudspeaker to detect the existence of breathing noises.

As a result, a number of improved monitoring devices have been proposed, such devices being operative to generate an electronic output signal indicative or related to respiration, which may be monitored automatically. Typically, the monitoring process automatically detects respiration from analysis of the signal and includes the step of generating an alarm if no respiration is detected or if a change in respiration rate is detected. A number of alternative schemes for detecting respiration electronically have been proposed. A first group of schemes utilises one or more pressure sensing means provided under or otherwise impinged upon by the movement of a subject's chest whilst breathing. Such systems include: US Patent 5,515,865 and US Patent 5,796,340 which each disclose a fluid filled pad incorporating a pressure sensor, the fluid filled pad being placed under the infant and changes in fluid pressure being monitored to detect respiratory movement; US Patent 5,864,291 which discloses strapping a fluid filled enclosure to an infant and monitoring pressure changes in the fluid filled enclosure to detect respiratory motion; US Patent 6,047,201 which discloses monitoring the infants pulse and blood oxygen levels via a device fitted to the infants foot; US Patent 6,267,730 which discloses a device wherein a plunger cooperates with a projection of the device and a piezoelectric member to detect respiratory movement; US Patent 6,280,392 which discloses the provision of a plurality of pressure sensors beneath an infant to detect respiratory movement; and US Patent 6,375,621 which discloses providing a large piezoelectric film under the infant and performing spectrum periodogram or histiogram analysis on signals output by the piezoelectric film to detect respiratory movement or the absence thereof.

However, pressure sensing means provided under a subject or strapped to a subject are prone to detect room noise and movement of the floor or bed/cot in addition to the subject's respiration. These additional signals can mask the respiration signal. These problems limit the accuracy of such systems.

An alternative respiratory monitor disclosed in US 5,914,660 incorporates an optical monitoring arrangement to monitor respiration and determine whether the

subject has moved into a dangerous position i.e. lying upon their front for an infant. The optical arrangement comprises light sensing means operable to detect light reflected from a reflector means provided on the subject's chest. Such systems are however unreliable as the reflected light may be blocked by bed covers or a misplaced

arm.

As a further alternative US Patent 6,289,238 which discloses a wearable electrode arrangement for measuring EEG or ECG signals, body temperature, or body perspiration; and US Patent 6,363,270 which discloses a device having electronic means for monitoring skin conductance, heart rate and blood oxygen and issuing an alarm if simultaneous changes occur in two of the above. In these systems, respiration is detected indirectly by monitoring other body parameters. Furthermore, the detecting means is intrusive and/or potentially uncomfortable when attached to a subject.

It is therefore an object of the present invention to provide a new form of respiratory monitor that overcomes or alleviates some of the above noted problems.

According to a first aspect of the present invention there is provided a respiratory monitor comprising: a base unit and a detector unit; said detector unit being mounted on or next to a subject's thorax, so as to move in phase with respiratory movement of said subject; said detector unit comprising an accelerometer for sensing movement of the detector unit and thereby outputting a signal indicative of the subject's respiratory movement and signal transmitting means for transmitting the signal output by the accelerometer to said base unit; and said base unit comprising signal receiving means for receiving said signal output by said detector unit and means for outputting an indication in response to the signal received from the detector unit. - A - The present invention thus provides a respiratory monitor, which directly and accurately measures respiration with minimum intrusion or discomfort for the subject.

A processor may be provided in the detector unit, to process signals output by the accelerometer and thereby determine the respiratory rate and respiratory depth of a subject and additionally, change and rates of change in the respiratory rate and respiratory depth, dependent on the determined values, the processor may output either a 'comfort' signal or an 'alarm' signal. Preferably the processor is operable to output the respiratory rate value. Preferably the processor comprises a microprocessor.

Preferably, the processor compares the determined values with predetermined safe ranges of values, before outputting a 'comfort' signal or an 'alarm' signal. Preferably, if the determined values fall within the safe range, then a 'comfort' signal is output by the processing means and if one or more of the determined values falls without said safe range for a predetermined period of time, then an 'alarm' signal is output by the processing means. This predetermined time delay minimises the number of 'false alarms' that are generated from inaccurate signals, recorded during subject movement.

The signal transmitting means preferably comprises an RF signal generator connected to an RF aerial or an RF signal coupling means. The RF signal generator is operable to output an RF signal corresponding to the signal output by the processor unit. The RF signal generator is preferably operable to incorporate a unique identification code in each signal it generates. Preferably the accelerometer, the processor and the signal transmitting means are implemented in a single integrated circuit. Preferably the detector unit is provided

in a single package.

Preferably, the package contains said integrated circuit and a power source. The power source may conveniently be a battery. Preferably, the package is adapted such that the battery is non replaceable. In this manner the detector unit is disposed of and replaced once the battery runs flat. By providing the elements of the detector unit on a single integrated circuit and by packaging the integrated circuit along with the battery using techniques well established in the semiconductor industry, the detector unit may be manufactured cheaply enough to be disposable.

In alternative embodiments, the power source may comprise a rechargeable battery and/or a means for extracting power from an RF signal.

In order to reduce power consumption by the detector means, the RF signal generator preferably only generates an RF signal intermittently if the output of the processor remains constant. The time interval between successive generated signals may vary dependent upon whether the signal is a 'comfort' signal or an 'alarm' signal.

If the detector unit is disposable, preferably the processor is operable to monitor the battery and output a 'battery level warning' signal when the battery power level drops below a predetermined level. This 'battery level warning' signal may be

different to the 'alarm' signal to minimise confusion between a true apnea episode and a low battery power level, preventing panic in the parent/carer. Preferably the detector unit is provided with attachment means for mounting the detector unit in a position wherein it moves in phase with the subject's thorax during respiration. The attachment means may comprise one of the following means: a hook and loop fastener fabric (such as Velcro™) for sticking to a subject's clothing, a non slip coating or surface to retain the unit within a subject's pocket, one or more projecting or recessed formations for straps, tapes, ribbons, cords or similar allowing the unit to be connected either to such straps, tapes, ribbons, cords or similar provided as integral parts of the subject's clothing or provided around the subject independently of the subject's clothing.

Preferably, the detector unit is particularly adapted to be used to monitor respiration of infants. In such embodiments, the packaged detector unit may be sufficiently large as not to present choking hazard.

The base unit preferably comprises an RF aerial, an RF signal receiving means connected to said RF aerial and visual means and audio means. The visual means and audio means are preferably controlled by said RF signal receiving means to output a 'comfort' indication, an 'alarm' indication, a 'battery level warning' indication and/or the subjects respiratory rate in response to the received RF signals. The RF signal means may also control the visual and audio means to output an 'alarm' indication if no signal is received from the detector unit in a predetermined time interval. Preferably, the RF signal receiving means is operable to extract an identification code from received signals and thereby verify that the received signals are from the detector unit before controlling the visual or audio means. Preferably, the visual means comprises an LED, lamp or similar and the audio means comprises a loudspeaker, buzzer or similar. The visual means and/or the audio means may be adapted to provide a 'comfort' indication, when the base unit receives a 'comfort' signal from the detector unit. The 'comfort' indication may be the constant illumination of the visual means. The visual means and/or the audio means may be activated to provide an 'alarm' indication when the base unit receives an 'alarm' signal. If the visual means is activated to provide an 'alarm' indication, the alarm indication may be the intermittent or interrupted lighting of the visual means. If the audio means is used to provide an 'alarm' indication, the 'alarm' indication may be a continuous tone, an interrupted or intermittent tone, a tone sequence, sampled speech/music or similar. The visual means and/or the audio means may be activated to provide a 'battery level warning' indication when the base receives a 'battery level warning' signal. If the visual means is activated to provide a 'battery level warning' indication, the 'battery level warning' indication may be the intermittent or interrupted lighting of the visual means. If the audio means is used to provide a 'battery level warning' indication, the 'battery level warning' indication may be a continuous tone, an interrupted or intermittent tone, a tone sequence, sampled speech/music or similar.

In alternative embodiments, it is possible that visual and/or audio means may be provided on an independent indicator unit in addition to or in place of the visual and audio means on the base unit. The indicator unit may be located remotely of the base unit and may be in communication with the base unit via any suitable fixed or wireless link. In particularly preferred embodiments, the base unit may be positioned in the vicinity of the subject and the indicator unit may be provided in a separate room to the subject. This will allow those monitoring a subject to go about their business without having to be next to the subject at all times. It means that the subject will not be disturbed by a 'comfort' indication output by the indicator unit.

In some embodiments, the base unit may be operable to communicate with a plurality of indicator units. In the case of a baby at home, such units could be provided in other rooms of the home. In the case of a patient in a hospital, such indicator units could be carried by medical personnel. In further embodiments a single such indicator unit could be operable to communicate with a plurality of base units, hi such an embodiment, the indicator unit would preferably be operable to identify the base unit and hence the subject associated with any alarms output.

Optionally the base may also contain means for generating or for triggering another device to generate a wake up signal in the event of cessation of respiration to startle the subject into recommencing breathing.

As it may not be desirable or required to monitor a suspects respiration constantly, the base unit may be operable to output a control signal to the detector unit switching it between monitoring mode and standby mode. Preferably, when the detector unit receives such a signal from the base unit, it transmits an acknowledgement signal. Preferably, said control signals and said acknowledgement signals each incorporate the detector units unique identification code. When a new detector unit is used for the first time, the base unit may be operable to transmit an identify signal to the detector unit. The identify signal will command the detector unit to transmit its unique identification code to the base unit. Preferably, the base unit provides a cradle or similar where the detector unit

may be placed whilst not in use.

Preferably, the base unit is provided with an attachment means enabling the base unit to be attached to the parent/carer and be taken from room to room in a

portable fashion.

hi some embodiments, it may be possible for a base unit to be in communication with a plurality of detector units, hi one embodiment multiple detector units may be mounted upon the same subject, hi this embodiment the processor may be operable to only output an 'alarm' signal if the determined values of both detector units fall outside the safe range for a predetermined period of time, hi an alternative embodiment, the plurality of detector units may be each mounted upon different subjects. It is of course also possible that a plurality of different subjects may each have multiple detector units mounted upon them, hi this embodiment, the base unit may be operable to identify the detector unit and hence the subject associated with any alarms output. This may be by providing the base unit with a plurality of separate visual means. Alternatively, the base unit may be provided with an additional visual display operable when an 'alarm' indication is output to indicate which detector unit has transmitted the 'alarm' signal. As a further alternative, the audio means may be operable to output a different audio 'alarm' indication in response to alarms output by different detector units.

hi alternative embodiments, it is of course possible that a processor may be provided in the base unit and the signals output by the accelerometer can be transmitted directly to the base unit for processing. According to a second aspect of the present invention, there is provided a method for monitoring a subject's respiration comprising the steps of: providing a respiratory monitor comprising a base unit and a detector unit, said detector unit comprising an accelerometer; mounting said detector unit on or next to a subject's thorax, so as to move in phase with respiratory movement of said subject and thus sense the respiratory movement of the subject; transmitting the output of said accelerometer to a base unit; and outputting a visual or audio indication of the subject's respiration.

The second aspect of the invention may be implemented by a respiratory monitor according to the first aspect of the present invention incorporating any or all of the features of the first aspect of the present invention.

In order that the invention is more clearly understood, it will now be described further herein with reference to the accompanying drawings, in which:

Figure 1 shows a schematic block diagram of a detector unit of a respiratory monitor according to the present invention; and

Figure 2 shows a schematic block diagram of a base unit of a respiratory monitor according to the present invention.

Referring now to figures 1 and 2, a respiratory monitor comprises a detector unit 100 and a base unit 110. The detector unit is mounted on a subject's chest or on clothing lying around a subject's chest such that the detector unit moves in phase with the respiratory movement of the subject. The detector unit 100 comprises an accelerometer 101, a processor 102, an RF signal generator 103, an RF aerial 104 and a power source 105. The accelerometer 101 generates electrical signals in response to movement of the detector unit along any of one or more axes. The output of the accelerometer is fed to processor 102.

The processor 102 processes said signals output by the accelerometer 101 to determine respiratory rate, respiratory depth, and changes or rates of changes in these quantities. The processor may further analyse the signals to determine if the subject is making any additional movement. The processor 102 compares the determined values for these quantities with a predetermined range of safe values. If the determined values fall within the safe range the processor 102 outputs a comfort signal If the determined values fall without the safe range the processor 102 outputs an alarm signal.

The processor 102, in some embodiments, may also be operable to store values for respiratory rate, respiratory depth and additional movement and thereby determine an appropriate safe range.

The RF signal generator 103 is operable to generate an RF signal corresponding to the output of the processor 102 and pass said RF signal to the aerial

104. The aerial 104 then transmits said RF signal to the base unit 110. The RF signal generator 103 is also operable to include in each generated RF signal an identification code, identifying the monitoring unit 100.

The accelerometer 101, processor 102, RF signal generator 103 and RF aerial 104 are each provided as part of a common integrated circuit. The integrated circuit is encapsulated in a protective plastic package along with a suitable power source 105, such as a battery. On the outside of the package is provided suitable mounting means

(not shown) for mounting the detector unit on a subject's chest or to a subject's clothing adjacent to their chest.

In a preferred embodiment the battery is non-replaceable and non- rechargeable and thus the detector unit is disposable once the battery 105 runs flat. In alternative embodiments the battery may be non-replaceable but may be rechargeable, typically by a non-contact coupling arrangement. In yet further embodiments, the power source 105 may be adapted to extract power from external RF signals.

If the output of the processor 102 is a 'comfort' signal, and remains a comfort signal for an extended period of time, rather than constantly outputting an RF

'comfort' signal the RF signal generator 103 generates an RF 'comfort' signal at regular time intervals. These time intervals may be as long as five minutes. If however the processor output changes to alarm, then an alarm signal is immediately generated the RF signal generator 103. The alarm signal may be generated continually until the processor 102 output changes from alarm to comfort or alternatively may be generated at regular time intervals. The time interval between successive alarm signals is typically relatively short compared to the time interval between successive comfort signals.

Referring now to figure 2, the RF signals output by said detector unit 100 are received by an aerial 109 on said base unit 110. An RF signal receiver 106 connected to said aerial 109 processes said received signals to determine if they are comfort

signals or alarm signals. The signal receiving means 106 also processes the signals to determine the identification code incorporated into the signal. If the identification code does not match the identification code of the detector unit 100, the signal receiving means 106 disregards the signals.

In response to comfort signals or alarm signals received from the detector unit 100 said receiver unit activates visual means 108 and audio means 107 provided on the base unit 110.

hi a preferred embodiment, the visual means 108 comprises an LED. The LED 108 may be illuminated continuously or intermittently in response to a comfort signal or in an alternative embodiment may be illuminated continuously in response to a comfort signal and intermittently in response to an alarm signal. In further alternatives, more complex visual means 108 may be provided such as a combination of two different coloured LEDs or an LED and a display means operable to display text or symbols indicative of the last recorded output status of processor 102.

hi preferred embodiments, the audio means 107 is only activated in response to an alarm signal. The audio means can output any suitable alarm signal such as a continuous tone, an intermittent tone, a tone sequence or sampled speech.

The base unit 110 is typically mains powered or at least mains rechargeable. A parent may thus mount a detector unit 100 on their child when they lie the child down to sleep and be provided with a comfort indication by the base unit whilst they go about their business in, for instance, another room.

hi an alternative embodiment, the base unit 110 may be located in the vicinity of the subject and be operable to communicate with one or more indicator units (not shown) at remote locations. The indicator units may incorporate visual means 107 and audio means 108 for generating comfort signals and alarm signals. The indicator units can be provided in another room or carried on ones person. This allows a person to monitor a subject remotely. It also reduces the necessary power of RF signals emitted from the detector unit 100 in the vicinity of the subject. This increases the typical battery life of the detector unit 100 and reduces the dose of RF radiation that is absorbed by the subject.

It is of course to be understood that the invention is not to be limited to the details of the above embodiments that are described by way of example only.

Claims

1. A respiratory monitor comprising: a base unit and a detector unit; said detector unit being mounted on or next to a subject's thorax, so as to move in phase with respiratory movement of said subject; said detector unit comprising an accelerometer for sensing movement of the detector unit and thereby outputting a signal indicative of the subjects respiratory movement and signal transmitting means for transmitting the signal output by the accelerometer to said base unit; and said base unit comprising signal receiving means for receiving said signal output by said detector unit and means for outputting an indication in response to the signal received from the detector unit.
2. A respiratory monitor according to claim 1, wherein a processor is provided, said processor being operable to process signals output by the accelerometer and thereby determine the respiratory rate and respiratory depth of a subject.
3. A respiratory monitor according to claim 1 or claim 2, wherein the processor is operable to process signals output by the accelerometer and thereby determine change and rates of change in the respiratory rate and respiratory depth.
4. A respiratory monitor according to any one of claims 1 to 3, wherein the processor may output either a 'comfort' signal or an 'alarm' signal dependent on the determined values.
5. A respiratory monitor according to any one of claims 1 to 4, wherein the processor is operable to output a respiratory rate value.
6. A respiratory monitor according to any one of claims 1 to 5, wherein the processor is provided in the detector unit.
7. A respiratory monitor according to any one of claims 1 to 6, wherein the processor compares the determined values with predetermined safe ranges of values, before outputting a 'comfort' signal or an 'alarm' signal; said
'comfort' signal output by said processor if the determined values fall within the safe range and said 'alarm' signal output by said processing means if the determined values fall without the safe range for a predetermined period of time..
8. A respiratory monitor according to any one of claims 1 to 7, wherein the signal transmitting means comprises an RF signal generator connected to an RF aerial or an RF signal coupling means.
9. A respiratory monitor according to any one of claims 1 to 8, wherein the signal transmitting means is operable to output an RF signal corresponding to the signal output by the processor unit.
10. A respiratory monitor according to any one of claims 1 to 9, wherein the RF signal generator is operable to incorporate a unique identification code in each signal it generates.
11. A respiratory monitor according to any one of claims 1 to 10, wherein the RF signal generator generates an RF signal intermittently if the output of the processor remains constant.
12. A respiratory monitor according to any one of claims 1 to 11, wherein the accelerometer, the processor and the signal transmitting means are implemented in a single integrated circuit.
13. A respiratory monitor according to any one of claims 1 to 12, wherein the detector unit is provided in a single package containing said integrated circuit and a power source.
14. A respiratory monitor according to claim 13, wherein the power source is a battery.
15. A respiratory monitor according to claim 13, wherein the power source comprises a means for extracting power from an RF signal.
16. A respiratory monitor according to any one of claims 1 to 14, wherein the processor is operable to monitor the battery and output a 'battery level warning' signal when the battery power level drops below a predetermined level.
17. A respiratory monitor according to any one of claims 1 to 16, wherein the detector unit is provided with an attachment means for mounting the detector unit in a position wherein it moves in phase with the subject's thorax during respiration.
18. A respiratory monitor according to any one of claims 1 to 17, wherein the base unit comprises an RF aerial, an RF receiving means connected to said RF aerial and a visual and audio means; said visual and audio means being controlled by said RF signal receiving means to output a 'comfort' indication, an 'alarm' indication, a 'battery level warning' indication and/or the subjects respiratory rate in response to the received RF signals.
19. A respiratory monitor according to claim 18, wherein the visual means comprises one or more of at least one LED, at least one lamp, or a display means operable to display text and/or symbols.
20. A respiratory monitor according to claim 18, wherein the audio means comprises a loudspeaker, buzzer or similar.
21. A respiratory monitor according to any one of claims 1 to 20, wherein the base contains means for generating or triggering another device to generate a wake up signal in the event of an 'alarm' signal being output by the processor to startle the subject into recommencing breathing.
22. A respiratory monitor according to any one of claims 1 to 21, wherein the base unit is operable to output a control signal to the detector unit switching it between monitoring mode and standby mode.
23. A respiratory monitor according to any one of claims 1 to 22, wherein the detector unit is operable to transmit an acknowledgement signal to the base unit upon receiving the control signal.
24. A respiratory monitor according to claim 22 or claim 23, wherein the control signal and the acknowledgement signal each incorporate the detector unit's unique identification code.
25. A respiratory unit according to any one of claims 1 to 23, wherein the base unit is operable to transmit an identify signal to a detector unit used for the first time, said identify signal commanding the detector unit to transmit its unique identification code to the base unit.
26. A respiratory unit according to any one of claims 1 to 25, wherein the base unit provides a cradle where the detector unit may be placed whilst not in use.
27. A respiratory unit according to any one of claims 1 to 26, wherein the base unit is provided with an attachment means enabling the base unit to be portable and be moved room to room.
28. A respiratory unit according to any one of claims 1 to 27, wherein visual and/or audio means may be provided on an independent indicator unit.
29. A respiratory unit according to claim 28, wherein the indicator unit is in communication with said base unit.
30. A respiratory unit according to claim 28 or claim 29, wherein the communication between the indicator unit and the base unit is via a wireless
link.
31. A respiratory unit according to any one of claims 28 to 30, wherein the base unit is positioned in the vicinity of the subject and the indicator unit is provided in a separate room to the subject.
32. A respiratory unit according to any one of claims 28 to 31, wherein the base unit may be operable to communicate with a plurality of indicator units.
33. A respiratory unit according to any one of claims 28 to 32, wherein the or each indicator unit is operable to communicate with a plurality of base units.
34. A respiratory unit according to claim 33, wherein the indicator unit is operable to identify the base unit and hence the subject associated with any alarms output.
35. A respiratory unit according to claim 33 or 34, wherein the indicator unit is provided with a plurality of audio and/or visual means.
36. A respiratory monitor as claimed in any one of claims 33 to 35, wherein separate audio and/or visual means are operable to output the signal received for each base unit.
37. A respiratory monitor as claimed in any one of claims 1 to 36, wherein the base unit is operable to receive signals from a plurality of detector units.
38. A respiratory monitor as claimed in any one of claims 1 to 37, wherein the plurality of detector units are mounted upon the same subject.
39. A respiratory monitor according to any one of claims 1 to 38, wherein the processor only outputs an 'alarm' signal if the determined values of both detector units fall outside the safe range for a predetermined period of time.
40. A respiratory monitor as claimed in any one of claims 1 to 39, wherein the plurality of detector units are in communication with the base unit, each detector unit being mounted on a different subject.
41. A respiratory unit according to any one of claims 1 to 40, wherein the indicator unit is operable to identify the detector unit and hence the subject associated with any alarms output.
42. A respiratory monitor as claimed in any one of claims 1 to 41, wherein the base unit is provided with a plurality of audio and/or visual means.
43. A respiratory monitor as claimed in any one of claims 1 to 42, wherein separate audio and/or visual means are operable to output the signal received for each detector unit.
44. A method for monitoring a subjects respiration comprising the steps of: providing a respiratory monitor comprising a base unit and a detector unit, said detector unit comprising an accelerometer; mounting said detector unit on or next to a subject's thorax, so as to move in phase with respiratory movement of said subject and thus sense the respiratory movement of the subject; transmitting the output of said detector unit to said base unit; and outputting a visual or audio indication of the subject's respiration.
PCT/IB2005/002871 2004-10-01 2005-09-27 Respiratory monitor WO2006038074A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB0421731.1 2004-10-01
GB0421731A GB0421731D0 (en) 2004-10-01 2004-10-01 Respiratory monitor

Publications (1)

Publication Number Publication Date
WO2006038074A1 true true WO2006038074A1 (en) 2006-04-13

Family

ID=33427819

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2005/002871 WO2006038074A1 (en) 2004-10-01 2005-09-27 Respiratory monitor

Country Status (2)

Country Link
GB (1) GB0421731D0 (en)
WO (1) WO2006038074A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008037820A1 (en) * 2006-09-27 2008-04-03 Universidad De Cádiz System for monitoring and analysing cardiorespiratory signals and snoring
WO2008155184A1 (en) * 2007-06-18 2008-12-24 Robert Bosch Gmbh Garment with a sensor element for monitoring breathing and heart activity
US20110137217A1 (en) * 2009-12-07 2011-06-09 Mark Shinnick Method and device preserving of infant sleep and avoidance of infant adaptation

Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3972320A (en) * 1974-08-12 1976-08-03 Gabor Ujhelyi Kalman Patient monitoring system
US4494553A (en) * 1981-04-01 1985-01-22 F. William Carr Vital signs monitor
US5058600A (en) * 1990-01-08 1991-10-22 Center For Innovative Technology Graphical readout of laryngotracheal spectra and airway monitor
US5309922A (en) * 1992-09-21 1994-05-10 Center For Innovative Technology Respiratory sound analyzer for use in high noise environments
US5515865A (en) 1994-04-22 1996-05-14 The United States Of America As Represented By The Secretary Of The Army Sudden Infant Death Syndrome (SIDS) monitor and stimulator
US5796340A (en) 1996-08-12 1998-08-18 Miller; William Motion monitor useful for sleeping humans
US5864291A (en) 1993-04-12 1999-01-26 Lifetek, Inc. Breathing monitor with isolating coupler
US5914660A (en) 1998-03-26 1999-06-22 Waterview Llc Position monitor and alarm apparatus for reducing the possibility of sudden infant death syndrome (SIDS)
US5935081A (en) * 1998-01-20 1999-08-10 Cardiac Pacemakers, Inc. Long term monitoring of acceleration signals for optimization of pacing therapy
US5989193A (en) * 1995-05-19 1999-11-23 Somed Pty Limited Device and method for detecting and recording snoring
US6047201A (en) 1998-04-02 2000-04-04 Jackson, Iii; William H. Infant blood oxygen monitor and SIDS warning device
US6267730B1 (en) 1998-08-25 2001-07-31 Kenneth M. Pacunas Apnea detecting system
US6280392B1 (en) 1998-07-29 2001-08-28 Denso Corporation Infant condition monitoring system and method using load cell sensor sheet
US6375621B1 (en) 1987-03-06 2002-04-23 Ocean Laboratories, Inc. Passive apnea monitor
WO2003005893A2 (en) * 2001-07-13 2003-01-23 Isis Innovation Limited Respiration and heart rate monitor
WO2004043263A2 (en) * 2002-11-07 2004-05-27 Block, David, Cesar Monitoring respiratory movements device

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3972320A (en) * 1974-08-12 1976-08-03 Gabor Ujhelyi Kalman Patient monitoring system
US4494553A (en) * 1981-04-01 1985-01-22 F. William Carr Vital signs monitor
US6375621B1 (en) 1987-03-06 2002-04-23 Ocean Laboratories, Inc. Passive apnea monitor
US5058600A (en) * 1990-01-08 1991-10-22 Center For Innovative Technology Graphical readout of laryngotracheal spectra and airway monitor
US5309922A (en) * 1992-09-21 1994-05-10 Center For Innovative Technology Respiratory sound analyzer for use in high noise environments
US5864291A (en) 1993-04-12 1999-01-26 Lifetek, Inc. Breathing monitor with isolating coupler
US5515865A (en) 1994-04-22 1996-05-14 The United States Of America As Represented By The Secretary Of The Army Sudden Infant Death Syndrome (SIDS) monitor and stimulator
US5989193A (en) * 1995-05-19 1999-11-23 Somed Pty Limited Device and method for detecting and recording snoring
US5796340A (en) 1996-08-12 1998-08-18 Miller; William Motion monitor useful for sleeping humans
US5935081A (en) * 1998-01-20 1999-08-10 Cardiac Pacemakers, Inc. Long term monitoring of acceleration signals for optimization of pacing therapy
US5914660A (en) 1998-03-26 1999-06-22 Waterview Llc Position monitor and alarm apparatus for reducing the possibility of sudden infant death syndrome (SIDS)
US6047201A (en) 1998-04-02 2000-04-04 Jackson, Iii; William H. Infant blood oxygen monitor and SIDS warning device
US6280392B1 (en) 1998-07-29 2001-08-28 Denso Corporation Infant condition monitoring system and method using load cell sensor sheet
US6267730B1 (en) 1998-08-25 2001-07-31 Kenneth M. Pacunas Apnea detecting system
WO2003005893A2 (en) * 2001-07-13 2003-01-23 Isis Innovation Limited Respiration and heart rate monitor
WO2004043263A2 (en) * 2002-11-07 2004-05-27 Block, David, Cesar Monitoring respiratory movements device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008037820A1 (en) * 2006-09-27 2008-04-03 Universidad De Cádiz System for monitoring and analysing cardiorespiratory signals and snoring
ES2298060A1 (en) * 2006-09-27 2008-05-01 Universidad De Cadiz. System for monitoring and analyzing cardiorespiratory and snoring signals.
WO2008155184A1 (en) * 2007-06-18 2008-12-24 Robert Bosch Gmbh Garment with a sensor element for monitoring breathing and heart activity
US20110137217A1 (en) * 2009-12-07 2011-06-09 Mark Shinnick Method and device preserving of infant sleep and avoidance of infant adaptation

Also Published As

Publication number Publication date Type
GB0421731D0 (en) 2004-11-03 grant

Similar Documents

Publication Publication Date Title
US7586418B2 (en) Multifunctional personal emergency response system
US6160478A (en) Wireless health monitoring system
Baker et al. Wireless sensor networks for home health care
US6204767B1 (en) Chair monitor
US8527038B2 (en) Body-worn vital sign monitor
US6454724B1 (en) Sleep apnea detection system and method
US20100063365A1 (en) Apparatus and System for Monitoring
US20040111045A1 (en) Devices and methods for passive patient monitoring
US5964720A (en) Method and system for monitoring the physiological condition of a patient
US6975230B1 (en) Method and apparatus for registering movement patterns of human beings
US6208251B1 (en) System for monitoring and assisting isolated persons, and device for implementing the system
US4819860A (en) Wrist-mounted vital functions monitor and emergency locator
US20110066010A1 (en) Body-worn vital sign monitor
US20110066045A1 (en) Body-worn vital sign monitor
US20110066050A1 (en) Body-worn vital sign monitor
US20070204691A1 (en) System and method for monitoring conditions and events
US20100217345A1 (en) Microphone for remote health sensing
US20090131761A1 (en) Device providing spot-check of vital signs using an in-the-ear probe
US20150112151A1 (en) Patient position detection system
US20040183684A1 (en) Wireless patient ambulation motion detector and second call system
US6064910A (en) Respirator rate/respiration depth detector and device for monitoring respiratory activity employing same
US20070100218A1 (en) Single use pulse oximeter
US20030130590A1 (en) Method and apparatus for providing patient care
US4438771A (en) Passive contactless monitor for detecting cessation of cardiopulmonary
US20090131774A1 (en) Single use pulse oximeter

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KM KP KR KZ LC LK LR LS LT LU LV LY MA MD MG MK MN MW MX MZ NA NG NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU LV MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase in:

Ref country code: DE

122 Ep: pct app. not ent. europ. phase