Adjustment for hydrocephalus shunt valve

摘要

An implantable medical device is disclosed that includes a valve seat and a valve member movable with respect to the valve seat. An adjustment circuit assembly includes a resistive element that is coupled to the valve member and operable to position the valve member relative to the valve seat so as to alter the pressure setting in response to a current applied to the resistive element.

主权项

1. An adjustable shunt system, comprising:
an implantable flow control device, comprising:
a valve seat;a valve member interfacing with the seat to establish a pressure setting indicative of a pressure where fluid will flow through the valve seat;an adjustment circuit assembly including a resistive element coupled to the valve member and operable to adjust force on the valve member relative to the valve seat so as to alter the pressure setting in response to a current applied to the resistive element; anda reading circuit assembly including an antenna coil, a sensing coil and a member movable with respect to the sensing coil, the member configured to alter a resonant frequency of the reading circuit assembly as a function of a position of the member with respect to the sensing coil; and a tool, comprising:
an adjustment circuit operably couplable with the adjustment circuit assembly so as to generate an oscillating electromagnetic field so as to induce a current in the resistive element; anda reading circuit operatively couplable with the reading circuit assembly and configured to induce a current in the antenna coil to generate a signal indicative of the pressure setting.