PURPOSE To describe a noninvasive instrument that estimates intraocular pressure during episodes of external globe compression and to demonstrate the accuracy and reliability of this device by comparing it to the intraocular pressures simultaneously and manometrically measured in cannulated eyes. METHODS A thin fluid-filled bladder was constructed from flexible and inelastic plastic sheeting ...

Transducers for ultrasonic sensing and measurement are often operated with a short burst signal, example few cycles at specific excitation voltage frequency on the generating transducer. The vibration response of narrowband transducer in detection is usually dominated by resonant ringing, severely affecting its ability to detect two or more signals arriving receiver similar times. Prior researc...

Pressure ulcers continue to be a major health care problem. This paper describes an animal model and surface pressure delivery system for the production of experimentally derived pressure ulcers. A method for inducing dermal pressure lesions on the fuzzy rat was developed using a computer-controlled displacement column which produced a constant tissue interface pressure. The pressure column con...

The dynamic response of a transducer array made up of circular flexural plates in immersion is analytically calculated. The calculation method includes three steps: (1) the calculation of parallel resonant frequency and the velocity profile of each plate, (2) the calculation of mutual acoustic impedance between the plates, and (3) the calculation of velocity response, including the mechanical a...

To the Editor;-Loss of transducer holders for invasive pressure monitoring to the postanesthesia care unit or intensive care unit is a frequent occurrence in our institution. We have developed the following solution to this problem. With the transducer holder attached to an intravenous pole, the small black screws securing the transducer holder to its mounting clamp are removed and replaced wit...

This paper is concerned with transfer characteristics of a pneumatic micrometer system with a negative feedback transducer. The system has two negative feedback pathes. One of them is based on the transfer characteristics of the feedback transducer which is introduced to linealize the transfer characteristic of the system and the other is caused by repulsive pressure force between nozzle and it...

Implantable middle ear hearing devices (IMEHDs) have been developed as a new technology to overcome the limitations of conventional hearing aids. The piezoelectric cantilever transducers currently used in the IMEHDs have the advantages of low power consumption and ease of fabrication, but generate less high-frequency output. To address this problem, we proposed and designed a new piezoelectric ...