Piezoelectric-equipped equipment

In optical coherence tomography, piezoelectric motors are used to impart rapid periodic motion to the unit’s reference mirror and imaging optics. To enable creation of two- and three-dimensional images from optical interference patterns, optical fibers must be moved both axially and laterally during the scan. Piezo motors have proven to provide more precise movements resulting in improved image resolution over conventional electromagnetic motors.

Point-of-care and medical test equipment engage piezo technology. Where extremely fine tuned positioning and measuring equipment is required, piezo motors meet the need, which can create motion with extreme precision, from inches to nanometers.

Piezoelectric actuators are beginning to be used for transdermal drug delivery, such as with a needle-free insulin injection system. Piezoelectric devices are also being used in the monitoring of endoscope-gastroscope devices.

Biomedical micro-tools, such as tweezers, scissors and drills, have been adapted to a micro-robot base powered by piezo motors. Piezo motors are becoming more prevalent in micro-surgery and non-invasive surgery tools.

3D Cone Beam Imaging, used in orthodontics and for treating sleep apnea patients to obtain an exact model of the oral cavity for fitting oral appliances, employs the use of piezoelectric actuators.

Confocal microscopy used in ophthalmology for quality assurance of implants uses piezoelectric motors. Precise motion of the optics is required to adjust the focal plane and for surface scanning. Piezoelectric positioning systems are integrated directly into the optics.

Electromagnetic devices dominate the drive mechanisms in medical equipment designs today. However, increasing accuracy requirements in the micron and nanometer ranges, along with an inclination toward miniaturization, dynamics streamlining and interference immunity are pushing the physical limitations of electromagnetic drive systems. Piezoelectric motors are proving to be a viable alternative, finding their way into a growing number of medical device applications.