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Electrostatic Coating of Medical Devices Using Ultrasonic Atomization

IP.com Disclosure Number: IPCOM000018802D
Publication Date: 2003-Aug-11
Document File: 1 page(s) / 47K

Publishing Venue

The IP.com Prior Art Database

Abstract

Ultrasonic vibration is used to finely atomize liquid droplets in the electrostatic deposition of coatings on medical devices, such as intravascular stents. In such a system, quality atomization of a liquid coating is produced from the ultrasonic vibration and electrostatic repulsion. The only kinetic energy in the system is the attraction between the charged atomized particles and the grounded target.

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Electrostatic Coating of Medical Devices Using Ultrasonic Atomization

Backg;:ound

     Electrostatic coating of medical devices involves electrically charging liquid coating particles, spraying the charged liquid towards a grounded device.

     One of the problems with this process is that electro statical charging of liquid does not easily produce a finely atomized spray. It may be necessary to use an additional source of energy to assist in atomization. For example, air pressure is often used to force the liquid through an orifice causing additional atomization of the electrostatically charged liquid. The atomizing air pressure adds additional kinetic energy to the spray cloud, which often
overcomes the electrostatic attraction of the particles to the grounded device. The particles therefore may "fly" past the device and transfer efficiency is not maximized.

Invention

    To address the aforementioned problems with electrostatic coating methods ultrasonic vibration is used to finely atomize liquid droplets. Specifically, an ultrasonic spray nozzle is used in conjunction with an electrostatic spray process. In such a system, quality atomization of a liquid coating is produced from the ultrasonic vibration and electrostatic repulsion. The only kinetic energy in the system is the attraction between the charged atomized particles and the grounded target, in this case a medical device such as an intravascular stent.

Ultrasonic nozzles are known in the art. To facilitate the inven...