Patent ID: 6304785
Filing Date: 2001-10-16
Classification: A61B,A61N

Abstract:
An electrode insertion tool, comprising:a hollow handle having a rear end, and a front end which terminates in a reduced-diameter tubular extension in which is moveably positioned an injector, an electrode assembly to be inserted being fully receivable within the tubular extension adjacent the injector;spring means positioned within the handle between an adjustable and normally fixed plug and a moveable ring, and a trigger for holding the ring when the spring is compressed and actuable to release the ring;a cocking knob extending from and moveable within the rear end of the handle;an elongated connecting means extending within the handle and secured to the injector, moveable ring and cocking knob, whereby retraction of the knob retracts the injector and ring to compress the spring means;a damping means within the handle, and having a stationary part secured to the connecting means for applying a force approximating viscous damping to the connecting means, whereby release of the ring by actuation of the trigger causes high initial acceleration of the connecting means to drive the electrode out of the tubular extension for initial penetration of a tissue surface, followed by controlled velocity of the connecting means and electrode.