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Devices and methods for cutting tissue

  • US 8,292,909 B1
  • Filed: 07/16/2012
  • Issued: 10/23/2012
  • Est. Priority Date: 06/30/2010
  • Status: Active Grant
First Claim
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1. A medical device driven by a vacuum source, the device comprising:

  • a working end having an operable element, the operable element coupled to a mechanism, 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 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 a 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 such that as the drive shaft approaches the end of the drive or return stroke the linkage transfers a force to the shuttle body to assist in switching between the forward and return positions and prevents unstable flutter of the shuttle body between the forward and return positions.

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