This torque wrench is bidirectional, and is preset to apply adequate torque to the setscrew and will ratchet
when the setscrew is secure. The ratchet release mechanism prevents overtightening that could result in
device damage. To facilitate the loosening of tight extended setscrews, this wrench applies more torque in the
counterclockwise direction than in the clockwise direction.
NOTE:
As an additional safeguard, the tip of the torque wrench is designed to break off if used to overtighten
beyond preset torque levels. If this occurs, the broken tip must be extracted from the setscrew using forceps.
This torque wrench may also be used for loosening setscrews on other Boston Scienti
fi
c pulse generators
and lead accessories that have setscrews that tighten against a stop when fully retracted (these setscrews
typically have clear seal plugs). However, when retracting these setscrews, stop turning the torque wrench
when the setscrew has come in contact with the stop. The additional counterclockwise torque of this wrench
may cause these setscrews to become stuck if tightened against the stop.
Loosening Stuck Setscrews
Follow these steps to loosen stuck setscrews:
1.
From a perpendicular position, tilt the torque wrench to the side 20º to 30º from the vertical center axis of
the setscrew (Figure 8 on page 67).
2.
Rotate the wrench clockwise (for retracted setscrew) or counterclockwise (for extended setscrew) around
the axis three times, such that the handle of the wrench orbits the centerline of the screw (Figure 8 on
page 67). The torque wrench handle should not turn or twist during this rotation.
3.
As needed, you may attempt this up to four times with slightly more angle each time. If you cannot fully
loosen the setscrew, use the #2 torque wrench from Wrench Kit Model 6501.
4.
Once the setscrew has been freed, it may be extended or retracted as appropriate.
5.
Discard the torque wrench upon completion of this procedure.
66
