ADAPTIVE TIME DOMAIN FILTERING FOR IMPROVED BLOOD PRESSURE ESTIMATION
First Claim
1. A method of computing a blood pressure of a patient comprising the steps of:
- receiving a cuff pressure waveform in a processing unit from a blood pressure cuff positioned on the patient;
receiving an indication of the heart rate of the patient in the processing unit;
selecting filtering parameters based on the heart rate of the patient;
filtering the cuff pressure waveform in the processing unit based on the selected filtering parameters; and
determining the blood pressure of the patient in the processing unit based on the filtered cuff pressure waveform.
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Accused Products
Abstract
A system and method for processing a cuff pressure waveform to determine the blood pressure of a patient. A heart rate monitor acquires the patient'"'"'s heart rate. Based upon the acquired heart rate, the system selects filtering parameters for processing the cuff pressure waveform received from the patient. The filtering parameters include a high pass cutoff frequency and a low pass cutoff frequency that are determined based upon the heart rate of the patient. The low pass cutoff frequency is based upon a harmonic frequency of the heart rate while the high pass cutoff frequency is based upon the fundamental frequency of the heart rate. The high pass and low pass cutoff frequencies are used to select filtering coefficients. The high pass and low pass cutoff frequencies are selected based upon the heart rate of the patient such that the filtering adapts based on the heart rate of the patient.
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Citations
20 Claims
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1. A method of computing a blood pressure of a patient comprising the steps of:
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receiving a cuff pressure waveform in a processing unit from a blood pressure cuff positioned on the patient; receiving an indication of the heart rate of the patient in the processing unit; selecting filtering parameters based on the heart rate of the patient; filtering the cuff pressure waveform in the processing unit based on the selected filtering parameters; and determining the blood pressure of the patient in the processing unit based on the filtered cuff pressure waveform. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of processing a cuff pressure waveform received from a blood pressure cuff positioned on a patient, the method comprising the steps of:
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receiving an indication of the heart rate of the patient in a processing unit; selecting filtering parameters for filtering the cuff pressure waveform based upon the heart rate of the patient; and filtering the cuff pressure waveform in the processing unit based upon the selected filtering parameters. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A system for determining the blood pressure of a patient, the system comprising:
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a processing unit; a heart rate monitor connected to the patient to determine the heart rate of the patient, wherein the heart rate monitor communicates the determined heart rate to the processing unit; a blood pressure cuff positioned on the patient to obtain a cuff pressure waveform from the patient, wherein the cuff pressure waveform is provided to the processing unit; a memory unit in communication with the processing unit, wherein the memory unit includes a series of filtering coefficients; a low pass filter contained in the processing unit and having a low pass cutoff frequency determined by the heart rate of the patient; and a high pass filter contained within the processing unit and having a high pass cutoff determined by the heart rate of the patient. - View Dependent Claims (18, 19, 20)
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Specification