Project Main Details
2010-03-19 16:02:53 GMT 2010-03-19 14:22:50 (GMT -07:00) Mountain Time (US & Canada) Yes (click here to learn more about ) Closed - Note: This project was manually closed by the voice seeker before it reached its original deadline. 0 0 0 direct invitation(s) have been sent by the voice seeker resulting in 0 audition(s) and/or proposal(s) so far. Voice123 SmartCast is seeking 50 auditions and/or proposals for this project (approx.) Invitations sent by SmartCast have resulted in 0 audition(s) and/or proposal(s) so far.
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Meanwhile, in the UK, **************** introduced their Lotus ultrasonic torsional mode device for endoscopic keyhole surgery. Frictional heat is generated within shears that are attached to the waveguide thereby enabling the sealing of relatively large arteries.
More recently *****, the world leader in ultrasonic cataract surgery, introduced a surgical handpiece that could operate in a torsional mode at 31 kHz and in a longitudinal mode at 43 kHz. The longitudinal motion within the piezo stack is converted into a torsional motion by means of the spiral spring.
While the ***** handpiece remains optimized for the relatively low power environment associated with cataract procedures Piezo Innovations has advanced this concept further.
***************** has developed new technology that enables small ergonomic handpieces to used for a variety of medical and dental procedures. Optimum compact design was achieved by placing the spiral spring behind the piezo drive stack. To increase power the spiral spring was sandwiched between a pair of piezo stacks that operated in a push-push mode that doubled the longitudinal and torsional motion within the spring.
This compact design configuration enables the handpiece to operate efficiently in a combined 30 kHz L-T mode with a much shorter piezo drive stack than competitive designs. The design and analysis of L-T transducers is relatively complex requiring proprietary experimental methods and finite element analysis.
This high power dual piezo stack prototype handpiece operates at a frequency of 25 kHz. Since the overall length of the piezo stacks and spiral spring have been reduced, the piezo stacks have the same electrical polarity and operate in a push-push mode rather than push-pull.
The design and analysis of handpieces operating in a torsional mode of vibration is complex. Evolving optimum practical designs requires the precise measurement of the longitudinal and transverse modes of vibration within the handpiece assembly. Piezo Innovations has a well-equipped transducer laboratory with specialized measurement instruments, including a laser vibrometer and complex impedance analyzer.
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