Pulsed lavage handpiece with improved handle

摘要

A suction and irrigation handpiece is disclosed having a trigger that cooperates with a locking mechanism to lock the trigger into one a plurality of preselected angular positions. The trigger has a plurality of grooves on an inner surface that removably couple with a tooth of the locking mechanism. The locking mechanism includes a shaft rotatably connected through the housing, a locking arm connected to the shaft, and the tooth at the far end of the shaft. The electrical connections between batteries and a motor in the handpiece also are arranged to facilitate manufacture and uniformly energize the pump at a preset position of the trigger. The handpiece thus has a first conductive lead connected between one pole of the battery and a contact port that is relatively far from the trigger pivot, and a second conductive lead is connected between one port of the motor and the contact port. These two leads form an open circuit at the contact port that may be closed by a conductor connected to the trigger. The other port of the motor is electrically connected to the other pole of the batteries.