| 摘要 |
An apparatus and method for improved control of low viscosity fluid flow during electrohydrodynamic spray deposition of the fluid to coat small targets, such as medical devices like stents. The apparatus includes a targe t holder (2) which applies a first electrical potential to a target (1), a coating fluid transporter such as a wick (7), a siphon tube (11) or a siphon tube (11) with a wick (20) therein along which the coating fluid (5) flows from a reservoir (4) to a dispensing end (10, 14) of the transporter, and an electrode (6) which applied a second electrical potential to the coating flu id sufficient to cause the coating fluid (5) to be attracted from the dispensin g end (10, 14) of the transporter toward the target (1). This provides a targe t coating apparatus with highly self regulating coating fluid flow characteristics despite the low viscosity of the coating fluid, while producing highly consistent and uniform target coatings.
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