Stylet insertion assembly for body implantable lead.

摘要

A body implantable lead comprises a lead portion (10) having a distal electrode end portion (12) and a proximal terminal end protion (13). End portion (12) comprises a helical tissue securing member (42) adapted to be screwed into ani- maltissue by the rotation ofstyiet (20) via slotted screwdriver end (62) and slot (64). The stylet (20) is rotated by a knob (74) secured to the proximal end of the stylet and in order for the operator to sense the depth of insertion of the tissue securing member (42) the knob (74) is formed with at least one longitudinal slot detentingly engaged by a pawl formed in the guide (76) to give a sensible indication each time a predetermined rotational increment has been traversed.