Iwao Seo

TL;DR: A catheter having a transducer that comprises an organic high polymer film-like piezoelectric element or elements is described in this paper, which has the capacity of converting, safely and with accurate wave shapes, pressure in the living body, for example, blood pressure, intrauterine pressure, etc.

TL;DR: In this paper, an alternate copolymer of vinylidene cyanide and vinyl acetate has been investigated dielectrically at temperatures above Tg ~170°C and a remarkable relaxation was observed in the 1 Hz to 10 kHz frequency range due to a separation from coexisting contributions.

TL;DR: In this article, the third-order nonlinear permittivity of a copolymer of vinylidene cyanide and vinyl acetate at temperatures above Tg~170degC was measured as a function of the frequency.

TL;DR: In this paper, a high molecular piezoelectric element was used for measuring blood pressure, heart pulse, and heart sound, which was enclosed in netting comprised of a metal wire mesh so that the transducer is completely shielded from outer mechanical and electrical noise.

TL;DR: An ultrasonic transducer includes a piezoelectric member consisting of either a unpolarized polyamide material or an in-advance polarized polyamide polymer material or the like.