External programmer for magnetically-adjustable cerebrospinal fluid shunt valve
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United States of America Patent
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-
Sep 20, 1988
Issued Date -
N/A
app pub date -
Oct 7, 1986
filing date -
Dec 8, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Adjusting the popping pressure of a surgically-implanted shunt valve of the type having one or more elements adapted to move under the influence of a magnetic field, by positioning an adjustment device in proximity to the implanted valve but external to the body, providing the adjustment device with a plurality of electromagnets, selectively energizing the electromagnets through a sequence of steps in which different ones of the electromagnets are energized at successive steps, selecting the sequence of energization and the orientation and strength of the electromagnets so that the elements in the implanted device are caused to move in response to the sequence of energization to thereby adjust the popping pressure.
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