Holder for electrically charging a substrate during coating

A stent holder for removeably holding a stent during a coating process wherein the stent holder comprises

• a stent mounting portion comprising at least two arms upon which the stent is mounted, the at least two arms defining a hollow space therebetween, and
• an electrically chargeable section separate from the stent mounting portion,
• wherein the arms form an elliptical portion configured to exert force on an inner surface of the stent,
• wherein the arms are coupled to the electrically chargeable section that electrically charges the stent during the coating process and at least a portion of the electrically chargeable section includes a dimension larger than an inner diameter of the stent so that the stent sits on the electrically chargeable section, and
• wherein when the elliptical portion exerts force on the inner surface of the stent, the arms diverge from a central axis of the stent holder, making at least one bend, and converge at the central axis of the stent holder, or the arms diverge from a central axis of the stent holder and arc to converge at the central axis of the stent holder, the arms touching one another both where the arms diverge and where the arms converge.