WO2000071027A1 - Medical device for measurements of cardiac or pulmonary activity - Google Patents
Medical device for measurements of cardiac or pulmonary activity Download PDFInfo
- Publication number
- WO2000071027A1 WO2000071027A1 PCT/GB2000/001976 GB0001976W WO0071027A1 WO 2000071027 A1 WO2000071027 A1 WO 2000071027A1 GB 0001976 W GB0001976 W GB 0001976W WO 0071027 A1 WO0071027 A1 WO 0071027A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- physiological condition
- stored measurements
- abnormal physiological
- processing means
- identify
- Prior art date
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- 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
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Physics & Mathematics (AREA)
- Dentistry (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Physiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Measuring And Recording Apparatus For Diagnosis (AREA)
- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
Abstract
A device comprising means for obtaining measurements of cardiac or pulmonary activity at successive instants in time, memory means for storing said measurements and processing means for identifying in said stored measurements any trend indicative of an abnormal physiological condition, for example cardiac or pulmonary failure due to sleep apnoea.
Description
MEDICAL DEVICE FOR MEASUREMENTS OF CARDIAC OR PULMONARY
ACTIVITY
A number of devices are known for monitoring a person's cardiac or pulmonary activity in order to detect the onset of an abnormal physiological condition such as sleep apnoea.
In a known device, a measured value is compared with a constant, predetermined value and an alarm triggered when the two values differ by more than an acceptable amount, thus indicating the existence of an abnormal physiological condition.
However, the device is unable to provide any warning prior to the onset of an abnormal physiological condition so that appropriate preventative action may be taken.
Furthermore, spurious isolated measurements may cause false triggering of the alarm.
We have now devised an arrangement which overcomes the limitations of existing devices.
In accordance with the present invention, there is provided a device comprising means for obtaining measurements of cardiac or pulmonary activity at successive instants in time, memory means for storing said measurements and processing means for identifying in said stored measurements any trend indicative of an abnormal physiological condition.
Preferably the processing means are arranged to identify in said stored measurements any progressive increase or decrease in the rate or magnitude of cardiac or pulmonary activity indicative of an impending abnormal physiological condition, for example cardiac or pulmonary failure due to sleep apnoea.
Preferably the processing means are also arranged to identify in said stored measurements any substantially constant deviation in the rate or magnitude of said cardiac or pulmonary activity from a preset value indicative of an existing abnormal
physiological condition.
Preferably the processing means are arranged to identify a trend in the stored measurements indicative of an abnormal physiological condition by fitting an equation to the stored measurements. Most preferably a linear equation is fitted to the stored measurements.
Preferably, a measure of the deviation of each of the stored measurements from the equation fitted thereto or from a mean value is used to estimate the likelihood of an existing or impending abnormal physiological condition being incorrectly identified.
Preferably the device comprises alarm means for providing an output signal when it is estimated from the fitted equation that within a predetermined period of time the magnitude or rate of cardiac or pulmonary activity will exceed a predetermined threshold value.
An embodiment of the present invention will now be described by way of an example only and with reference to the accompanying drawings, in which: Figure 1 is a schematic diagram illustrating the hardware components of a device in accordance with the present invention;
Figure 2 is a graph illustrating two potentially significant trends in measurements of cardiac or pulmonary activity; and
Figure 3 is a graph illustrating a further two potentially significant types of trend in measurements of cardiac or pulmonary activity.
Referring to Figure 1 of the drawings, a device is shown for monitoring a person's cardiac and pulmonary activity.
A sensor 2 , arranged to be attached to or placed in close proximity to a person, provides output signals in response to variations in pressure caused by the beating of the person's heart and by the person inhaling and exhaling.
Analogue output signals from the sensor 2 pass ln-turn through an amplifier 4, low-pass filter 6 (to remove high frequency noise) and digital sampling means 8. A finite impulse response (FIR) digital bandpass filter 10 separates the digital signal into its cardiac and pulmonary components.
A first processing means 12 derives measurements from the respective signals, at successive instants of time, of the magnitude and rates of cardiac and pulmonary activity and stores these measurements m an electronic memory 14. The stored measurements are subsequently processed by a second processing means 16 to identify therein any trends which may indicate an abnormal physiological condition or the likelihood of such a condition arising.
The respective trends m each case take different forms. Firstly, as shown in Figure 2, a progressive increase or decrease m the rate and/or magnitude of cardiac and/or pulmonary activity may be indicative of an impending abnormal physiological condition. Secondly, as shown m Figure 3, a substantially constant deviation m the rate and/or magnitude of cardiac and/or pulmonary activity from respective preset values, whilst not necessarily indicative of an impending abnormal physiological condition, might nevertheless indicate an existing abnormal physiological condition.
The second processing means 16 are arranged to identify trends in the stored measurements indicative of an abnormal physiological condition by fitting respective lines to each set of stored measurements.
A fitted line of zero gradient, but displaced from a mean value by more than a predetermined amount, will be indicative of an existing abnormal physiological condition, whereas a fitted line of non-zero gradient will instead indicate the possibility of an abnormal physiological condition arising at some later time. In the latter case, the displacement of the fitted line from a predetermined mean value
may be used by the second processing means to estimate the period of time remaining before a safe threshold level for a particular measurement will be exceeded. Where an abnormal physiological condition exists or is deemed imminent, an audible alarm 18 is sounded.
A measure of the deviation of each of the stored measurements from the line fitted thereto or from a mean value is used to estimate the likelihood of an abnormal physiological condition being incorrectly identified. The device is provided with a first interface 20 for communicating data to and from a personal computer 22 for display or analysis, a second interface 24 by which the device may be connected to a computer network e.g. the World Wide Web, for on-line monitoring of the person's cardiac and pulmonary activity, and built-in display means 26.
The built-in display means 26 and interfaces 20 and 24 may be used to provide a display of the raw signals acquired by the sensor 2, the output of the bandpass filter 10, the output of the first processing means 12 and/or various results generated the second processing means 16.
The device thus described may be used to provide a reliable early warning of the possible onset of an abnormal physiological condition such as sleep apnoea.
Claims
Claims
1) A device comprising means for obtaining measurements of cardiac or pulmonary activity at successive instants in time, memory means for storing said measurements and processing means for identifying in said stored measurements any trend indicative of an abnormal physiological condition.
2) A device as claimed in Claim 1, wherein the processing means are arranged to identify in said stored measurements any progressive increase in the rate of cardiac activity indicative of an impending abnormal physiological condition.
3) A device as claimed in Claim 1, wherein the processing means are arranged to identify in said stored measurements any progressive increase in the rate of pulmonary activity indicative of an impending abnormal physiological condition.
4) A device as claimed in Claim 1, wherein the processing means are arranged to identify in said stored measurements any progressive increase in the magnitude of cardiac activity indicative of an impending abnormal physiological condition.
5) A device as claimed in Claim 1, wherein the processing means are arranged to identify in said stored measurements any progressive increase in the magnitude of pulmonary activity indicative of an impending abnormal physiological condition.
6) A device as claimed in Claim 1, wherein the processing means are arranged to identify in said stored measurements any progressive decrease in the rate of cardiac activity indicative of an impending abnormal physiological condition.
7) A device as claimed in Claim 1, wherein the processing
means are arranged to identify in said stored measurements any progressive decrease in the rate of pulmonary activity indicative of an impending abnormal physiological condition.
8) A device as claimed in Claim 1, wherein the processing means are arranged to identify in said stored measurements any progressive decrease in the magnitude of cardiac activity indicative of an impending abnormal physiological condition.
9) A device as claimed in Claim 1, wherein the processing means are arranged to identify in said stored measurements any progressive decrease in the magnitude of pulmonary activity indicative of an impending abnormal physiological condition.
10) A device as claimed in Claim 2 or Claim 6, wherein the processing means are arranged to identify in said stored measurements any substantially constant deviation in the rate of said cardiac activity from a preset value indicative of an existing abnormal physiological condition.
11) A device as claimed in Claim 3 or Claim 7, wherein the processing means are arranged to identify in said stored measurements any substantially constant deviation in the rate of said pulmonary activity from a preset value indicative of an existing abnormal physiological condition.
12) A device as claimed in Claim 4 or Claim 8, wherein the processing means are arranged to identify in said stored measurements any substantially constant deviation in the magnitude of said cardiac activity from a preset value indicative of an existing abnormal physiological condition.
13) A device as claimed in Claim 5 or Claim 9, wherein the processing means are arranged to identify in said stored
measurements any substantially constant deviation in the magnitude of said pulmonary activity from a preset value indicative of an existing abnormal physiological condition.
14) A device as claimed in any of Claims 10 to 13, wherein the processing means are arranged to identify a trend in the stored measurements indicative of an existing abnormal physiological condition by fitting an equation to the stored measurements .
15) A device as claimed in Claim 14, wherein a linear equation is fitted to the stored measurements.
16) A device as claimed in any of Claims 2 to 9, wherein the processing means are arranged to identify a trend in the stored measurements indicative of an impending abnormal physiological condition by fitting an equation to the stored measurements .
17) A device as claimed in Claim 16, wherein a linear equation is fitted to the stored measurements.
18) A device as claimed in Claim 14 or Claim 15, wherein a measure of the deviation of each of the stored measurements from the equation fitted thereto is used to estimate the likelihood of an existing abnormal physiological condition being incorrectly identified.
19) A device as claimed in Claim 16 or Claim 17, wherein a measure of the deviation of each of the stored measurements from the equation fitted thereto is used to estimate the likelihood of an impending abnormal physiological condition being incorrectly identified.
20) A device as claimed in any of Claims 2 to 9, wherein a measure of the deviation of each of the stored measurements from a mean value is used to estimate the likelihood of an existing abnormal physiological condition being incorrectly identified.
21) A device as claimed in any of Claims 10 to 13, wherein a measure of the deviation of each of the stored measurements from a mean value is used to estimate the likelihood of an impending abnormal physiological condition being incorrectly identified.
22) A device as claimed in Claim 16, as appended to Claim
4 or Claim 8, comprising alarm means for providing an output signal when it is estimated from the fitted equation that within a predetermined period of time the magnitude of cardiac activity will exceed a predetermined threshold value.
23) A device as claimed in Claim 16, as appended to Claim
5 or Claim 9, comprising alarm means for providing an output signal when it is estimated from the fitted equation that within a predetermined period of time the magnitude of pulmonary activity will exceed a predetermined threshold value.
24) A device as claimed in 16, as appended to Claim 2 or Claim 6, comprising alarm means for providing an output signal when it is estimated from the fitted equation that within a predetermined period of time the rate of cardiac activity will exceed a predetermined threshold value.
25) A device as claimed in Claim 16, as appended to Claim 3 or Claim 7, comprising alarm means for providing an output signal when it is estimated from the fitted equation that within a predetermined period of time the rate of pulmonary
activity will exceed a predetermined threshold value.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU50866/00A AU5086600A (en) | 1999-05-25 | 2000-05-23 | Medical device for measurements of cardiac or pulmonary activity |
| GB0127866A GB2365534A (en) | 1999-05-25 | 2000-05-23 | Medical device for measurements of cardiac or pulmonary activity |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9911985.1 | 1999-05-25 | ||
| GB9911985A GB2354823A (en) | 1999-05-25 | 1999-05-25 | Device for identifying a trend indicative of an abnormal physiological condition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2000071027A1 true WO2000071027A1 (en) | 2000-11-30 |
Family
ID=10853999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/GB2000/001976 WO2000071027A1 (en) | 1999-05-25 | 2000-05-23 | Medical device for measurements of cardiac or pulmonary activity |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU5086600A (en) |
| GB (2) | GB2354823A (en) |
| WO (1) | WO2000071027A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1549212A1 (en) * | 2002-03-26 | 2005-07-06 | Vivometrics, Inc. | Method and system for extracting cardiac parameters from plethysmographic signals |
| US8137270B2 (en) | 2003-11-18 | 2012-03-20 | Adidas Ag | Method and system for processing data from ambulatory physiological monitoring |
| US8790272B2 (en) | 2002-03-26 | 2014-07-29 | Adidas Ag | Method and system for extracting cardiac parameters from plethysmographic signals |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0222484A2 (en) * | 1985-10-31 | 1987-05-20 | U.T. Medical Manufacturing, Inc. | Movement monitor for cardio-pulmonary and other activity |
| WO1990009146A1 (en) * | 1989-02-16 | 1990-08-23 | Air-Shields, Inc. | Neonatal cardiorespirograph incorporating multi-variable display and memory |
| US5479932A (en) * | 1993-08-16 | 1996-01-02 | Higgins; Joseph | Infant health monitoring system |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4899758A (en) * | 1986-01-31 | 1990-02-13 | Regents Of The University Of Minnesota | Method and apparatus for monitoring and diagnosing hypertension and congestive heart failure |
| GB2214309B (en) * | 1987-12-26 | 1992-08-12 | Fukuda Denshi Kk | Electrocardiographic waveform display apparatus and method of expressing electrocardiographic waveforms |
| US5197480A (en) * | 1990-06-08 | 1993-03-30 | Vitatron Medical, B.V. | System and method for monitoring heart transplant rejection |
| JPH04180730A (en) * | 1990-11-16 | 1992-06-26 | Atsufuku Takara | Stress level measuring instrument |
| JP3154425B2 (en) * | 1992-01-07 | 2001-04-09 | フクダ電子株式会社 | Electrocardiogram information recording method and device |
| US5438983A (en) * | 1993-09-13 | 1995-08-08 | Hewlett-Packard Company | Patient alarm detection using trend vector analysis |
-
1999
- 1999-05-25 GB GB9911985A patent/GB2354823A/en not_active Withdrawn
-
2000
- 2000-05-23 GB GB0127866A patent/GB2365534A/en not_active Withdrawn
- 2000-05-23 AU AU50866/00A patent/AU5086600A/en not_active Abandoned
- 2000-05-23 WO PCT/GB2000/001976 patent/WO2000071027A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0222484A2 (en) * | 1985-10-31 | 1987-05-20 | U.T. Medical Manufacturing, Inc. | Movement monitor for cardio-pulmonary and other activity |
| WO1990009146A1 (en) * | 1989-02-16 | 1990-08-23 | Air-Shields, Inc. | Neonatal cardiorespirograph incorporating multi-variable display and memory |
| US5479932A (en) * | 1993-08-16 | 1996-01-02 | Higgins; Joseph | Infant health monitoring system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1549212A1 (en) * | 2002-03-26 | 2005-07-06 | Vivometrics, Inc. | Method and system for extracting cardiac parameters from plethysmographic signals |
| EP1549212A4 (en) * | 2002-03-26 | 2007-05-09 | Vivometrics Inc | Method and system for extracting cardiac parameters from plethysmographic signals |
| US8790272B2 (en) | 2002-03-26 | 2014-07-29 | Adidas Ag | Method and system for extracting cardiac parameters from plethysmographic signals |
| US8137270B2 (en) | 2003-11-18 | 2012-03-20 | Adidas Ag | Method and system for processing data from ambulatory physiological monitoring |
| US9277871B2 (en) | 2003-11-18 | 2016-03-08 | Adidas Ag | Method and system for processing data from ambulatory physiological monitoring |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0127866D0 (en) | 2002-01-16 |
| GB9911985D0 (en) | 1999-07-21 |
| GB2365534A (en) | 2002-02-20 |
| GB2354823A (en) | 2001-04-04 |
| AU5086600A (en) | 2000-12-12 |
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