Patent ID: 8617142

Claim:
An indicator tool for use with an implanted valve unit having a plurality of performance settings, comprising: a housing with a readout window; an indicator wheel assembly capable of rotating within the housing on a spindle rotatably supported by the housing, and carrying indicia of performance settings sequentially viewable through the readout window; at least one magnet carried by the indicator wheel assembly to detect an actual setting of the implanted valve unit; a release mechanism which, when actuated by a user from a first position to a second position, enables the indicator wheel to rotate as the magnet is drawn toward the actual setting of the implanted valve unit; and a first gear carried by one of the release mechanism and the indicator wheel assembly and at least one catch, carried by the other of the release mechanism and the indicator wheel assembly, which drives the indicator wheel to display a single performance setting value through the readout window when the release mechanism returns to the first position.