Method and device for inflating a cuff of a non-invasive blood pressure measurement apparatus
First Claim
1. A method of inflating a cuff of a non-invasive blood pressure measurement apparatus, the method comprising the steps of:
- determining a plurality of target pressure values of the cuff for a plurality of time points;
measuring a plurality of pressure values of the cuff at the plurality of time points;
calculating an inflation speed parameter at one of time points (i+1), by determining a summation comprising;
a difference between the target pressure values at said one time point (i+1) and a previous time point (i),a difference between the measured pressure values at said one time point (i+1) and the previous time point (i),a ratio of the determined difference in target pressure values to the difference in measured pressure values,multiplying a value of the inflation speed parameter at the previous time point (i) by the ratio and a weighting factor specific to the previous time point (i),wherein the summation is carried out from an initial time point (i=1) to a current time point (n−
1),wherein the sum of the weighting factors from the initial time point (i=1) to the current time point (n−
1) is equal to 1; and
inflating the cuff at a speed corresponding to the calculated inflation speed parameter from said current time point (n−
1) until a next time point (n).
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Accused Products
Abstract
A method for inflating a cuff of a non-invasive blood pressure measurement apparatus includes obtaining a plurality of pressure values of the cuff at a plurality of time points; calculating a first inflation speed parameter on the basis of the plurality of pressure values, a plurality of target pressure values of the cuff at the plurality of time points and a plurality of inflation speed parameters corresponding to each time interval between every two adjacent time points of the plurality of time points; and inflating the cuff at a speed corresponding to the first inflation speed parameter from a last time point of the plurality of time points to a first time point after the plurality of time points. In this way, uniform cuff inflation can be achieved when the target pressure values of the cuff change uniformly, so that the over-voltage phenomenon or the condition of low-speed cuff inflation can be reduced or eliminated. By introducing the plurality of pressure values, even if there is a big error in a cuff pressure value obtained at a certain time point, it is still possible to control the cuff inflation correctly.
10 Citations
13 Claims
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1. A method of inflating a cuff of a non-invasive blood pressure measurement apparatus, the method comprising the steps of:
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determining a plurality of target pressure values of the cuff for a plurality of time points; measuring a plurality of pressure values of the cuff at the plurality of time points; calculating an inflation speed parameter at one of time points (i+1), by determining a summation comprising; a difference between the target pressure values at said one time point (i+1) and a previous time point (i), a difference between the measured pressure values at said one time point (i+1) and the previous time point (i), a ratio of the determined difference in target pressure values to the difference in measured pressure values, multiplying a value of the inflation speed parameter at the previous time point (i) by the ratio and a weighting factor specific to the previous time point (i), wherein the summation is carried out from an initial time point (i=1) to a current time point (n−
1),wherein the sum of the weighting factors from the initial time point (i=1) to the current time point (n−
1) is equal to 1; andinflating the cuff at a speed corresponding to the calculated inflation speed parameter from said current time point (n−
1) until a next time point (n). - View Dependent Claims (2, 3, 4, 5)
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6. A device for inflating a cuff of a non-invasive blood pressure measurement apparatus, the device comprising:
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a pressure sensor configured to sense a plurality of pressure values of the cuff at each of a plurality of time points; a processor configured to; determine a plurality of target pressure values of the cuff for a plurality of time points; measure a plurality of pressure values of the cuff at the plurality of time points; calculate an inflation speed parameter at one of time points (i+1), by determining a summation comprising;
p2 a difference between the target pressure values at said one time point (i+1) and a previous time point (i),a difference between the measured pressure values at said one time point (i+1) and the previous time point (i), a ratio of the determined difference in target pressure values to the difference in measured pressure values, multiplying a value of the inflation speed parameter at the previous time point (i) by the ratio and a weighting factor specific to the previous time point (i), wherein the summation is carried out from an initial time point (i=1) to a current time point (n−
1),wherein the sum of the weighting factors from the initial time point (i=1) to the current time point (n−
1) is equal to 1; andan inflation unit configured to inflate the cuff at a speed corresponding to the calculated inflation speed parameter from the current time point (n−
1) until a next time point (n). - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A device for inflating a cuff of a non-invasive blood pressure measurement apparatus, the device comprising:
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a pressure sensor configured to sense a plurality of pressure values of the cuff at each of a plurality of time points; a processor configured to calculate a next inflation speed parameter Sn, by means of the following equation;
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Specification