Patent ID: 8685052

Claim:
A medical device driven by a vacuum source, the device comprising: a handle having a linkage support element; a working end coupled to the handle, wherein the working end has an operable element and the operable element is coupled to a mechanism positioned in the handle, such that when the mechanism is driven by the vacuum source, movement of a drive shaft actuates the operable element; where the drive shaft is located in a chamber of the mechanism and moveable between a drive stroke and a return stroke; a shuttle body moveable between a forward and return positions, wherein movement between the forward and return positions alternates a fluid path between the chamber and vacuum source so that during application of vacuum from the vacuum source movement of the shuttle body causes the drive shaft to cycle between the drive stroke and the return stroke; and a linkage coupling the drive shaft to the shuttle body to assist in switching the shuttle body between the forward and return positions and preventing unstable flutter of the shuttle body between the forward and return positions, wherein the linkage is configured such that the linkage is supported by the linkage support element in a first position prior to use of the medical device and is unsupported by the linkage support element in a second position after use of the medical device.