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US 8,333,706 B2Granted
Method for processing of continuous pressure-related signals derivable from locations inside or outside a human body or body cavity
AssigneeDpcom AS
InventorPer Kristian Eide
Life of this patent
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Abstract
This invention describes a method for processing pressure signals derivable from locations inside or outside a human or animal body or body cavity. Different aspects of the invention relate to a method for optimal differentiating between cardiac beat- and artifact-induced pressure waves, a method for obtaining new and improved information from said pressure signals. In particular, this invention describes the use of said inventive method for processing of pressure signals for controlling an adjustable shunt valve. The method can be incorporated in a processing unit of a device for use in draining fluid from a brain or spinal fluid cavity.
Claims9
A method for processing continuous pressure-related signals derivable from locations inside or outside a human body or body cavity, comprising the steps of obtaining samples of said signals at specific intervals, and using a processing unit for converting thus sampled pressure signals into pressure-related digital data with a time reference,
- wherein for selectable time sequence windows the method comprises using the processing unit for the further steps of:
- a) identifying from said digital data single pressure waves related to cardiac beat-induced pressure waves,
- b) identifying from said digital data pressure waves related to artifacts or a combination of artifacts and cardiac beat-induced pressure waves,
- c) computing time sequence (TS.x)-related parameters of said single pressure waves during individual of said time sequence windows,
- d) establishing an analysis output of said time sequence (TS.x)-related parameters for a selectable number of said time sequence windows,
- e) establishing a deliverable first control signal related to an analysis output in step d) for a selectable number of said time sequence windows, said first control signal being determined according to one or more selectable criteria for said analysis output, and
- f) modifying said deliverable first control signal into a second control signal to provide a performance modifying signal,
- wherein said identifying steps a) and b) prevent further analysis of the time sequence windows with delta time sequence (ΔTS.x)-related parameters outside of the selected criteria for thresholds and ranges of said delta time sequence (ΔTS.x)-related parameters, said delta time sequence (ΔTS.x)-related parameters selected from one or more of:
- difference of mean values of starting diastolic minimum pressures between two subsequent time sequence windows (ΔTS.MeanPmin1),
- standard deviation of difference of mean values of starting diastolic minimum pressures of two subsequent time sequence windows (ΔTS.MeanPmin1—STD),
- difference of mean values of systolic maximum pressure between two subsequent time sequence windows (ΔTS.MeanPmax),
- standard deviation of difference of mean values of systolic maximum pressure between two subsequent time sequence windows (ΔTS.MeanPmax—STD),
- difference of mean amplitude values between two subsequent time sequence windows (ΔTS.MeandP),
- standard deviation of difference of mean amplitudes between two subsequent time sequence windows (ΔTS.MeandP_STD),
- difference of mean latency between two subsequent time sequence windows (ΔTS.MeandT),
- standard deviation of difference of mean latency between two subsequent time sequence windows (ΔTS.MeandT_STD),
- difference of mean rise time coefficient between two subsequent time sequence windows (ΔTS.MeanRT),
- standard deviation of difference of mean rise time coefficient between two subsequent time sequence windows (ΔTS.MeanRT_STD),
- difference of mean wave duration between two subsequent time sequence windows (ΔTS.MeanWD),
- standard deviation of difference of mean wave duration between two subsequent time sequence windows (ΔTS.MeanWD_STD),
- difference of mean single wave pressure between two subsequent time sequence windows (ΔTS.MeanSWP),
- standard deviation of difference of mean single wave pressure of two subsequent time sequence windows (ΔTS.MeanSWP_STD),
- difference of mean diastolic minimum pressure difference between two subsequent time sequence windows (ΔTS.MeanDiff_Pmin),
- standard deviation of difference of mean diastolic minimum pressure difference between two subsequent time sequence windows (ΔTS.MeanDiff_Pmin—STD),
- difference of mean systolic maximum pressure difference between two subsequent time sequence windows (ΔTS.MeanDiff_Pmax),
- standard deviation of difference of mean systolic maximum pressure difference between two subsequent time sequence windows (ΔTS.MeanDiff_Pmax—STD),
- difference of mean amplitude difference between two subsequent time sequence windows (ΔTS.MeanDiff_dP),
- standard deviation of difference of mean amplitude difference between two subsequent time sequence windows (ΔTS.MeanDiff_dP_STD),
- difference of mean latency difference between two subsequent time sequence windows (ΔTS.MeanDiff_dT),
- standard deviation of difference of mean latency difference between two subsequent time sequence windows (ΔTS.MeanDiff_dT_STD),
- difference of mean rise time coefficient difference between two subsequent time sequence windows (ΔTS.MeanDiff_RT),
- standard deviation of difference of mean rise time coefficient difference between two subsequent time sequence windows (ΔTS.MeanDiff_RT_STD),
- difference of mean wave duration difference between two subsequent time sequence windows (ΔTS.MeanDiff_WD),
- standard deviation of difference of mean wave duration difference between two subsequent time sequence windows (ΔTS.MeanDiff_WD_STD),
- difference of mean single wave pressure difference between two subsequent time sequence windows (ΔTS.MeanDiff_MeanSWP),
- standard deviation of difference of mean SW pressure difference between two subsequent time sequence windows (ΔTS.MeanDiff_MeanSWP_STD),
- difference of single wave count between two subsequent time sequence windows (ΔTS.SWCount),
- difference of mean wave amplitude between two subsequent time sequence windows (ΔTS.MeanWavedP),
- difference of mean wave latency between two subsequent time sequence windows (ΔTS.MeanWavedT), and
- difference of mean wave rise time coefficient between two subsequent time sequence windows (ΔTS.MeanWaveRT).
37 more elements
The method according to 1, wherein said identifying steps a) and b) are applied to each consecutive time sequence window in a continuous series of time sequence windows of a signal.
Dependencies are inferred from the claim text.