Patent ID: 8025621

Claim:
A medical device, comprising: a tube having a first end and a second end, the first end configured to engage an instrument tip; an inner shaft disposed in the tube; a shaft end connected to the inner shaft and configured to move lengthwise relative to the tube; a first abutment surface within the tube and configured to disengagingly abut a first shaft end stop of the shaft end upon lengthwise movement of the shaft end in a first direction; and a second abutment surface within the tube and configured to disengagingly abut a second shaft end stop of the shaft end generally opposite the first shaft end stop of the shaft end upon lengthwise movement of the shaft end in a direction opposite the first direction, wherein the shaft end is configured to slidably move along a length constrained by the abutment of the first shaft end stop against the first abutment surface and the second shaft end stop against the second abutment surface, and wherein at least one of the first abutment surface or the second abutment surface is positionally adjustable relative to the tube such that a range of longitudinal travel of the inner shaft is adjustable, wherein the device further comprises a yoke disposed within the instrument tip and including shaft threads configured to threadingly engage the inner shaft, wherein the tube includes threading at the first end of the tube configured to threadingly engage a back hub of the instrument tip, and wherein a first pitch of the shaft threads is different from a second pitch of the first end threading.