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Piezoelectric Ultrasound Transducers for Atrial Fibrillation Treatment

can cause blood to pool and form clots in an area of the heart called the left atrial appendage (LAA). When a blood clot escapes from the LAA and travels to another part of the body, it can cause a stroke [...] cardiac arrhythmia or rhythm abnormality. AF is an irregular and often rapid heart rate that may cause symptoms like heart palpitations, fatigue, and shortness of breath. Currently, more than 46 million [...] despite the large number of advances in the field over the past two decades, AF remains a substantial cause of mortality and morbidity. New Treatment Method Healium Medical has now developed a non-contact guided

Tracking Down Nanometer Instabilities: Every Detail Matters

not ordinarily considered “moving parts” can cause problems, such as transformers. Of course, stating that fact is a lot easier than chasing down the root cause of such an issue. That, unfortunately, is usually [...] Matters When you work with nanometer resolution motion equipment, details matter. Instabilities can be caused by a variety of things, ranging from floor disturbances leaking past isolation systems, to acoustic [...] smeared images and other noisy data. Fourier analysis is particularly helpful in revealing the root cause of the vibration problem and often points out one troublesome frequency: 60Hz — the mains frequency

Image Stabilization

High Velocity for Image Stabilization & Microscanning

purpose, the imaging components are moved quickly and precisely. This compensates for oscillations caused by external forces. Microscanning furthermore increases the resolution through fast motions between

Mini Piezoelectric Tubes for Fiber Endoscopy

>> Miniaturized piezo tubes can realize ultrafast movements using the > > inverse piezo effect , causing the optical fiber in the SFE to oscillate in mechanical resonance between 5 and 12 kHz. This results [...] scanning of the illumination plane with RGB laser light. The radial vibration movement can be modelled, causing the optical fiber to move during operation, e. g. in a spiral scan pattern or in Lissajous figures

PI Ceramic - Cardiovascular Surgery

Ultrasonic Ablation Using Piezo Catheters

or cardiac arrhythmia (e.g., atrial fibrillation) affect millions of people worldwide. Often they cause life-threatening complications such as heart attacks or strokes. Minimally invasive catheter solutions [...] intravascular lithotripsy is based on piezo-driven ultrasound catheters: They are used to treat the cause of arterial fibrillation with the help of targeted lesions, to prepare the area of treatment for a

Therapeutic Ultra Sound Piezo Transducers

treatment and are only used where they are in the sound field focus. An unstable cavitation caused by ultrasound causes the microspheres to burst and the medication to be released locally. Gas-filled microspheres [...] effects in the body: In histotripsy, ultrasound produces cavitation bubbles whose mechanical energy causes cells to burst. Thermal ablation using ultrasound generates heat of over 42°C by absorbing the wave

Fast Steering Mirrors (FSM) for Image Stabilization and Resolution Enhancement on Astronomical Telescopes

correct small jitter motions caused by vibrations. Earth-bound astronomical telescopes, on the other hand, are prone to resolution degradation due to wavefront distortion caused by fluctuations in the density [...] density of the atmosphere. These fluctuations cause the twinkling of the stars. One way of compensating for these fluctuations is with fast tip/tilt steering mirrors. PI has a long history of working with [...] Piezo-driven active mirrors can improve the effective resolution up to 10 times, by correcting blur caused by image jitter in real time which is particularly important during long integrations with weak light

Displacement Behavior

Displacement Behavior

responsible for the hysteresis also cause the creep behavior: Fig. 6: Displacement of a piezo actuator when driven with a sudden voltage change (step function). The creep causes approx. 1 % of the displacement [...] actuators are usually driven unipolarly. A semibipolar operation increases the strain amplitude while causing a stronger nonlinearity and hysteresis, which result from the increasing extrinsic domain portions

Novel Sample Stage Alignment Hexapod for X-ray Microscopy and Tomography

deformations of the joints are varying and that the thermal impact, caused by motor, gearbox, and the stiff roller screw drive, causes expansions that affect the overall accuracy at the point of interest [...] space-frame structure was chosen to support the linear measuring systems, reducing forces and torque caused by gravity to a minimum. The high precision Ovali hexapod with six motion legs, 6 linear encoder

Gentle Interventions with Piezo Driven Medical Handpieces Power Ultrasound

Enabling Tissue Management With Ultrasonic Handpieces

of tissue with simultaneous coagulation. This prevents heavy bleeding and promotes haemostasis, causing less trauma to the surrounding tissue and enabling an accelerated healing process as well as faster