[특허]Continuous cardiac output derived from arterial pressure waveform using pattern recognition

Continuous cardiac output derived from arterial pressure waveform using pattern recognition 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	A61B-052/15
출원번호	US-0362204 (1994-12-22)
발명자 / 주소	Martin James F.
출원인 / 주소	Eli Lilly and Company
대리인 / 주소	Fulwider Patton Lee & Utecht, LLP
인용정보	피인용 횟수 : 74 인용 특허 : 0

초록 ▼

A system and method of determining cardiac output from a cardiac pressure waveform. The pressure waveform is continuously sensed and converted into a digital data stream. When a complete beat frame of data is sensed, the processor extracts a plurality of features from the sensed waveform which characterize the waveform. These features are compared to stored representative pressure waveforms (RPW's) which have a known cardiac output. The RPW's are obtained by applying a pattern recognition methodology to pressure waveforms of known cardiac output. In one embodiment the typical shapes function is used. The pattern recognition methodology results in classes and associated cardiac outputs which are stored as the RPW's. The features extracted from waveforms representative of unknown cardiac output are thus classified by the comparison to the RPW's. When a match is made between the extracted features and an RPW, the cardiac output of the selected RPW is output as the cardiac output of the patient.

대표청구항 ▼

[ I claim:] [13.] A method for determining the cardiac output of a cardiovascular system from the blood pressure developed by the cardiovascular system, comprising the steps of:sensing the blood pressure developed by the cardiovascular system and providing a pressure signal representative of that blood pressure;converting the pressure signal representative of sensed blood pressure into a digitized pressure signal;storing a plurality of representative pressure waveforms, each representative pressure waveform comprising a set of values of selected features of a respective pressure signal developed by a cardiovascular system having a known cardiac output, and storing the known cardiac output corresponding to each representative pressure waveform;extracting at least one feature of the selected set of features from the digitized pressure signal and determining the value of each extracted feature;comparing the value of each extracted feature from the digitized pressure signal to the value of each corresponding feature of representative pressure waveforms stored in the memory;based on the comparison, selecting the representative pressure waveform most similar to the digitized pressure signal; andproviding the cardiac output value corresponding to the selected representative pressure waveform as the cardiac output of the cardiovascular system.

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Continuous cardiac output derived from arterial pressure waveform using pattern recognition 원문보기

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Continuous cardiac output derived from arterial pressure waveform using pattern recognition 원문보기

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