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Piezoelectric Self Expanding Stent Crimper

IP.com Disclosure Number: IPCOM000182412D
Publication Date: 2009-Apr-29
Document File: 2 page(s) / 138K

Publishing Venue

The IP.com Prior Art Database

Abstract

The mechanism would consist of a radial array of banks of dual non-resonant piezo motor actuators that are then mounted side by side and aligned to create a gradually reducing inner cone terminating at the French sized required for catheter loading.

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Title:

Piezoelectric Self Expanding Stent Crimper

Description:

The mechanism would consist of a radial array of banks of dual non-resonant piezo motor actuators that are then mounted side by side and aligned to create a gradually reducing inner cone terminating at the French sized required for catheter loading.

The piezo actuators generate motion through a succession of coordinated clamp/unclamp and expand/contract micro-impulse cycles.  Each extension cycle executes a step of a few nanometers, but running at hundreds of Hertz, the macroscopic result achieves continuous smooth motion a mm/second speed with virtually unlimited travel range of the stent body forward or backward.  The contact area of the piezo step foot print can be designed to sidestep and overlap that of either of the adjoining steps relative to strut length or stent cut pattern.  Step speeds of the individual piezo motors can be sequenced to create a pull, push, or equally transferred force along the length of the stent.

The unit consists of four parts:  two piezo modules, a mechanical housing with mechanical integrated preload and a moving part (stent) as a mechanical interface.  Each piezo module consists of a base plate and a minimum of two piezo stacks.

A step is realized by the stacks alternately making clamping contact with the moving part.  During the contact ph...