Medical device with adjustable inner shaft movement

A medical device, comprising:

• a tube having a first end configured to engage an instrument tip and a second end having internal threading;
• an inner shaft extending within the tube substantially from the second end to the first end;
• a shaft end connected to the inner shaft and configured to move lengthwise within the tube, the shaft end including a first surface aligned toward the first end of the tube and a second surface aligned toward the second end of the tube;
• a bearing stop fixedly disposed within the tube and configured to disengagingly abut the first surface of the shaft end;
• and
• a lock nut configured to abut the second surface of the shaft end and threadingly engaged with the internal threading of the tube such that the lock nut is positionally adjustable relative to the tube and such that a range of longitudinal travel of the inner shaft is adjustable,
• wherein the bearing stop includes a central recess along which the shaft end is movable,
• 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.

A method for operating a medical device, the method comprising:

• connecting a yoke of an instrument tip to a distal end of an inner shaft of a tube via first threading having a first pitch;
• connecting a back hub of the instrument tip to a distal end of the tube via second threading having a second pitch different from the first pitch of the first threading, the inner shaft generally slidably coaxially disposed in the tube and operably engaged with a tool of the instrument tip;
• adjusting a position of at least one of a first or second abutment surface relative to the tube;
• and
• limiting, via the adjusted at least one of the first and second abutment surfaces, a range of travel of the inner shaft between the first and second abutment surfaces.