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Wireless automatic ankle-brachial index (AABI) measurement system

  • US 20100292586A1
  • Filed: 05/13/2009
  • Published: 11/18/2010
  • Est. Priority Date: 05/13/2009
  • Status: Abandoned Application
First Claim
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1. Apparatus for determining a blood pressure of a subject comprising:

  • a) a pressure monitor adapted to be coupled to a limb of a test subject, wherein the monitor comprises

         1) first and second inflatable cuffs and first and second pressure sensors respectively coupled to said first and second cuffs,

         2) a compressor,

         3) a deflation valve coupled to said first and second cuffs,

         4) a first processor and wherein said first processor i) controls said compressor to inflate said first cuff to engage said first sensor to the limb and until blood flow through the limb is occluded and, ii) controls said compressor to inflate said second cuff to engage said second sensor to the limb at a location distal to said first cuff, iii) controls said deflation valve to deflate said first cuff in a plurality of steps, iv) stores data from said first sensor defining the pressure of said first cuff at occlusion and at each of said steps, and v) stores blood flow pressure data from said second sensor until termination of the deflation of the first cuff;

    b) a wireless communication link;

    c) a second processor coupled to said first processor via said communication link to receive data collected from said first and second sensors; and

    d) wherein the second processor processes the data received from said first and second sensors by i) sampling the occluding pressure data from said first sensor and the blood flow pressure data from said second sensor in a filtering operation to obtain first and second tables of indexed sample data and whereby the sample data exhibits reduced artifact and noise variances, ii) sampling the blood flow pressure sample data from table two in a derivative function to obtain a third table of sampled derivative data including at least one value identifying at least one slope transition of a waveform defined by the sample data of table two from declining to inclining, iii) arithmetically scoring seriatim groupings of the filtered sample data of table two relative to a plurality of conditions of the waveform of the filtered sample values and relative to the derivative values of said table three to determine an arithmetic score defining a low point sample value where the at least one slope transition of the filtered blood flow pressure sample data changes from declining to inclining, iv) correlating the low point sample value of table two relative to the unfiltered pressure data measured by the sensor one to determine a systolic pressure when blood flow returns to the monitored limb.

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