Electromagnetic Catheter-tip Flow Sensor
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概要
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By applying the time shared pulse drive on the square-wave electromagnetic multiplex flow system, a new catheter-tip flow sensor has been developed. Due to this pulse drive, the tiny sensor receives much less rms power compared to a single flow model of a continuous 1A magnet drive, which is related to reciprocal numbers of the multiplex channels. Since the sensitivity of this tiny sensor is dependent upon the peak current value of the square pulse, its sensitivity is quite equal to that expected of the single flow model.<BR>The finished dimensions of this new sensor are 2. 5 to 4 mm in outer diameter and 5 to 10 mm in length; it is mounted at the tip of the heart catheter. The surface temperature never exceeds 41°C even when it is used for over 30 minutes. The conversion ratio between the flow velocity and the flow induced emf voltage is measured by 0.5 micro V/cm/s, which may make it the most sensitive among this kind of sensors previously published.<BR>When flow tracings by this new sensor were compared with the simultaneously recorded tracings using ordinary extra-vascular probes at the same vascular location, the results indicated close coincidence in their wave forms and in the flow rate.
- 一般社団法人 日本生体医工学会の論文
一般社団法人 日本生体医工学会 | 論文
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