External programmer for magnetically-adjustable cerebrospinal fl

Details External programmer for magnetically-adjustable cerebrospinal fl External programmer for magnetically-adjustable cerebrospinal fl

1986-10-07

1988-09-20

Jaworski, Francis

Surgery

Devices transferring fluids from within one area of body to...

With flow control means

2511292, 25112911, 128748, A61M 500

Patent

active

047722576

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.

REFERENCES:
patent: 3527220 (1970-09-01), Summers
patent: 4156422 (1979-05-01), Hildebrandt et al.
patent: 4323074 (1982-04-01), Nelms
patent: 4360007 (1982-11-01), Levy et al.
patent: 4443214 (1984-04-01), Marion
patent: 4540400 (1985-09-01), Hooven
patent: 4541429 (1985-09-01), Prosl et al.
Summers, George D. and Mathews, Ernest S., M.D., "A New Miniature Pump for the Treatment of Hydrocephalus", Medical Instrumentation, May/Jun. 1967, pp. 9-16.
Hakim, Salomon, "Hydraulic and Mechanical Mis-matching of Valve Shunts Used in the Treatment of Hydrocephalus: the Need for a Servo-valve Shunt", reprinted from Developmental Medicine and Child Neurology, vol. 15, No. 5, Oct. 1973, pp. 646-653.

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