Surgery – Truss – Pad
Patent
1996-03-20
1998-04-07
Lateef, Marvin M.
Surgery
Truss
Pad
128670, 128672, A61B 502
Patent
active
057352860
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The present invention concerns the field of medical examinations, particularly medical monitoring over long periods and diagnostic aid, and has as its subject-matter an apparatus for measuring and processing physiological signals and an automatic process used by said apparatus.
At present, cardiac output and blood pressure are measured by separate apparatuses and only at significant intervals of time and in special conditions, i.e. at medical consultations or examinations by specialists.
Furthermore, blood pressure is determined by mechanical devices, which require compression and are consequently not suitable for continuous use.
Similarly, cardiac output, which is generally measured by invasive methods, requires cumbersome equipment and cannot be determined continuously over a long period.
There are also various types of apparatus using the principles of the variation in impedance of a given volume of the human body, allowing the cardiac output to be measured non-invasively.
However, these types of apparatus are fixed and non-portable and therefore do not allow the cardiac output of a patient in everyday life to be determined continuously.
Furthermore, they require analogue processing or, at least, preprocessing, of the signals recorded, which is subject to much interference, and the calculation formulae used do not rest absolutely on anatomical or physiological criteria.
Moreover, these known types of apparatus do not permit the simultaneous determination of blood pressure (mean, systolic or diastolic) and do not record the signals taken and/or the parameters calculated over long periods, with a view to subsequent global use. Finally, these types of apparatus mentioned above do not permit the capture and recording, separately and simultaneously, of at least one electrocardiogram signal, which allows the source and nature of the informative signals for processing to be diversified.
SUMMARY OF THE INVENTION
The present invention is aimed particularly at remedying all the above disadvantages. To this end, it has as its subject-matter an apparatus for measuring and processing physiological signals for the determination of cardiac and circulatory parameters, characterised in that it is constituted principally, on the one hand, by means for capturing, shaping and digitising continuously at least one electrocardiographic signal and one signal representing the variation in impedance of a given volume of the body of a patient, said means being connected to electrodes arranged at specific locations on the latter and, on the other hand, by a digital preprocessing unit co-operating with control and display means and a detachable storage means and/or a means for transmitting all the digitised signals or values taken from significant parameters, for each heartbeat, on the basis of said digitised signals and, finally, by a central digital processing device that collects and stores, by successive transfers, the data from the storage means or the transmission means and that permits the analysis of said data or said parameters over long time periods, their comparison with previous data or parameter values and the display and/or printing out of all the data being capable of serving for the preparation of a diagnosis.
The invention also has as its subject-matter an automatic measurement and processing process used by the apparatus described above, characterised in that it consists in recording continuously, by means of electrodes, at least one electrocardiographic signal and one signal representing the variation in impedance of a given volume of the body of a patient, delimited by transmitting electrodes and receiving electrodes, in filtering and digitising these signals, then in processing them by calculating the corresponding derivative signals and by determining the values, for each heartbeat, of various cardiac and circulatory parameters, in displaying in real time, as chosen by the user or the patient, the value or values of one or more of said parameters, in storing continuous
REFERENCES:
patent: 4562843 (1986-01-01), Djordjevich et al.
patent: 5025784 (1991-06-01), Shao et al.
patent: 5584298 (1996-12-01), Kabal
Notton Philippe
Schang Daniel
Evanisko George R.
Lateef Marvin M.
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