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1. 发明授权

US5441051A Method and apparatus for the non-invasive detection and classification of emboli 失效
标题翻译：用于非侵入性检测和分类栓塞的方法和装置
公开(公告)号：US5441051A
公开(公告)日：1995-08-15
申请号：US386297
申请日：1995-02-09
申请人： Ronald E. Hileman , Brian Wall , David A. Stump
发明人： Ronald E. Hileman , Brian Wall , David A. Stump
IPC分类号： A61B8/06 , G01S7/52 , A61B8/00
CPC分类号： A61B8/06 , G01S7/52036
摘要： A method and apparatus for ultrasonically detecting an embolus in blood flow includes an ultrasound transducer for transmitting ultrasound pulses into the blood flow being interrogated and receiving reflections from acoustic impedance changes in the body. The reflected signals are converted to an electronic signal representation which is subsequently processed to detect and classify emboli in the blood flow. A short duration, broad bandwidth ultrasound signal is used to preserve the polarity of the reflected signal. The polarity is then used to classify the emboli based on a positive or negative reflection coefficient. Emboli having a negative reflection coefficient are classified as either gaseous or fat particles, and emboli having a positive reflection coefficient are classified as solid particles. The emboli can be further classified based on the amplitude of the reflected signal, or designated features of the time waveform or FFT of the reflected signal.
摘要翻译：用于超声波检测血流中血栓的方法和装置包括超声波换能器，用于将超声脉冲发送到被询问的血流中，并接收来自体内声阻抗变化的反射。反射信号被转换成电子信号表示，其随后被处理以检测和分类血液中的栓塞。使用短持续时间的宽带超声信号来保持反射信号的极性。然后使用极性根据正或负反射系数对栓子进行分类。具有负反射系数的Emboli被分类为气体或脂肪颗粒，并且具有正反射系数的栓塞被分类为固体颗粒。可以基于反射信号的幅度或反射信号的时间波形或FFT的指定特征来进一步分类栓塞。

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