Abstract: A medical instrument includes a drive train assembly that causes precise index movement of the medical instrument, based on an operator-selected indexing amount resulting from actuation of a pitch adjustment knob on the medical instrument. The drive train assembly also causes a stylet to move distally within the outer housing of the medical instrument, to thereby push a seed from an extended shuttle of a seed cartridge located within the medical instrument, to a distal end of a needle cannula that is coupled to a distal end of the medical instrument.

Abstract: A medical instrument includes a distal frame portion that accepts a needle cam. The needle cam has helical slots for accepting a collar, whereby the collar rides up and down the needle cam, to thereby cause the needle cam to rotate. Spin movement of the needle is caused by movement of the collar, to thereby achieve a proper seed implantation during a medical procedure by having the needle spin between seed implant locations.

Abstract: A medical instrument provides for precise indexing in order to implant seeds into seed implant locations within a patient. The medical instrument is affixed to a targeting fixture, and upon operator actuation of a trigger, is automatically indexed from one seed implant location to a next seed implant location.