Implantable pressure transducer

Details Implantable pressure transducer Implantable pressure transducer

1974-09-16

1976-05-25

Howell, Kyle L.

Surgery

Truss

Perineal

128 205E, 128 21A, 73398R, 73398C, 73410, A61B 502

Patent

active

039585581

ABSTRACT:
A wireless, surgically implantable pressure transducer for measuring pressure of fluid or tissue in a body chamber such as brain ventricle of a patient suffering hydrocephalus or a severe head injury. The transducer includes a coaxial variable capacitor electrically connected across an inductor to form a parallel resonant L-C circuit. Alternatively, a coaxially variable inductor may be connected across a capacitor to form the L-C circuit. A bellows is mechanically connected to the variable component to vary the value of capacitance or inductance and hence the resonant frequency of the L-C circuit in response to pressure changes of the fluid in which the bellows is immersed. The transducer is electromagnetically coupled to an external source of variable-frequency oscillatory energy such as a grid-dip oscillator which enables external detection of the transducer resonant frequency which is in turn indicative of the level of fluid pressure being sensed.

REFERENCES:
patent: 2958781 (1960-11-01), Marchal et al.
patent: 3034356 (1962-05-01), Bieganski et al.
patent: 3144017 (1964-08-01), Muth
patent: 3583387 (1971-06-01), Garner
patent: 3638496 (1972-02-01), King
patent: 3738356 (1973-06-01), Workman
Electronics , Mar. 22, 1963, pp. 58-60.

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