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Medical instrument

  • US 7,922,742 B2
  • Filed: 03/25/2008
  • Issued: 04/12/2011
  • Est. Priority Date: 08/30/2000
  • Status: Expired due to Fees
First Claim
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1. A hydraulically actuated end effector for an endoscopic medical instrument, the end effector comprising:

  • a first hydraulic actuator responsive to changes in hydraulic actuation pressure to effect a first selected action and a second hydraulic actuator responsive to changes in hydraulic actuation pressure to effect a second selected action, said first or second hydraulic actuator comprising an extensible balloon to effect the selected action; and

    a retraction member operably connected to the balloon and configured for movement by a biasing member in response to changes in hydraulic actuation pressure to move the balloon to a retracted position.

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