Hewlett-packard Company

Koninklijke Philips Corporation N.v.

Alexander Tykulsky

J Fleming Dias

Henry E Karrer

Karl E Thiele

David G Miller

Richard F Dillman

Leslie I Halberg

Thaddeus G Minior

An ultrasound imaging device having a bipolar transmitter to generate a bipolar voltage signal, a transducer to emit an ultrasound wave in response to the bipolar voltage signal, and a bias generator to bias the bipolar voltage signal prior to being received by the transducer so that the biased bipolar voltage signal maintains a same polarity as a poling polarity of the transducer throughout a transmit cycle of the ultrasound imaging device. By biasing the bipolar voltage signal to maintain a same polarity as the poling polarity of the transducer throughout the transmit cycle, the ultrasound imaging device prevents depoling of the transducer which could otherwise occur if the transducer is driven by a bipolar voltage signal which repeatedly has a polarity opposite to the poling polarity of the transducer.

Ultrasound imaging device

The sampling volume of a pulsed Doppler system is increased to a length greater than that corresponding to one pulse by sampling the reflections of each launched pulse a plurality of successive times and accumulating the samples.

Extending sample volume in pulsed Doppler systems

A pressure dome is provided with resilient tongues that engage projections on a transducer in such manner as to draw the dome and transducer together when one is rotated with respect to the other. Detent notches for the projection ensure that the force between a dome and the transducer is always the same.

Pressure dome

The capacitive fluid pressure transducers described herein comprise quartz bodies and diaphragms having suitable electrodes deposited thereon to form both sensing and reference capacitors in appropriate configurations for high fidelity measurement of relative blood pressure, said transducers being substantially unaffected by temperature and other environment factors.

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Carlisle, MA, United States of America

Alexander Tykulsky