Method and tools for implanted device
A method and toolset capable of remotely moving a rotor of an implanted device in a first arcuate direction and detecting a first limit of travel, moving the rotor in a second, opposite direction and detecting a second limit of travel without altering the current performance setting of the implanted device, comparing the first and second limits of travel with known values for a plurality of selectable performance settings, and indicating the current performance setting of the implanted device.
1. A valve unit capable of being implanted in a patient and having adjustable performance settings to regulate passage of a bodily fluid, comprising:
a casing defining a port for the bodily fluid;
a valve mechanism positioned at the port and including a movable valve member;
a rotor disposed at a first location in the casing and having an axle which rotates about an axis of rotation, the rotor is also movable along the axis of rotation from a constrained condition, in which the rotor is constrained to rotate in an arc of predetermined angular distance, to an unconstrained condition; and
a spring arm unit disposed at a second location in the casing having a cam follower arm in slidable contact with the rotor and having a resilient spring element applying a closing effect with the movable valve member at the port to establish a performance setting for the valve unit;
wherein sufficient rotation of the rotor alters the closing effect with which the valve member moves relative to the port, and thereby alters the performance setting of the valve unit;
the casing defines a plurality of lock stops and the rotor defines at least one tooth which is engagable with at least one lock stop when the rotor is in the constrained condition and which does not engage the lock stops when the rotor is in the unconstrained condition.
2. The valve unit of claim 1 wherein the valve member defines at least one port restricting element alignable with the port in a plurality of positions to control flow through the valve unit.
3. The valve unit of claim 1 wherein the valve member is integral with the resilient spring element and is slidable to progressively restrict the port to establish a plurality of flow control settings.
4. The valve unit of claim 1 wherein the rotor includes magnetically attractable elements.
5. The valve unit of claim 4 wherein the rotor includes at least two magnets as the magnetically attractable elements, each magnet having an axis of magnetization that is transverse to the axis of rotation.
6. The valve unit of claim 5 wherein the magnets are spaced on opposite sides of the rotor and each magnet has an axis of magnetization that is arranged to lie between forty-five degrees to ninety degrees relative to the axis of rotation.
7. The valve unit of claim 6 in combination with a setting adjuster tool positionable in proximity with the valve unit, exterior to the patient, and having magnets which have sufficient attractive strength with the magnetically attractable elements to lift the rotor from the constrained condition to the unconstrained condition to enable adjustment of the rotor from an actual setting to another setting.
8. The valve unit of claim 7 wherein the adjuster magnets have at least one axis of magnetization that is alignable substantially in parallel with the axis of rotation of the rotor.
9. The valve unit of claim 8 in combination with a setting indicator tool positionable in proximity with the valve unit, exterior to the patient, and capable of detecting an actual setting of the valve unit without altering the actual setting.
10. The valve unit of claim 9 wherein the indicator tool includes a gear and a wheel which rotates substantially freely in a detection condition when it is disengaged relative to the gear and which is driven to a discrete setting value by the gear in a locked condition.