Wide band inductive transdermal power and data link

Details Wide band inductive transdermal power and data link Wide band inductive transdermal power and data link

1985-04-02

1987-07-14

Kamm, William E.

Surgery

Truss

Pad

128903, A61N 100

Patent

active

046795600

ABSTRACT:
The present invention utilizes a pair of coils, one beneath the skin and one outside the skin, each connected to a capacitor. The values of the capacitor and coil inductance are selected to provide a stagger-tuned link. That is, the values of the components are selected to place the pole of one filter above the operating frequency, and the pole of the other filter below the operating frequency of the link. The poles will move as the coupling coefficient changes, desensitizing the link to the coupling so that the coils can be misaligned in any manner with little effect on the output.
A fully active driver or class D amplifier is preferably utilized to effectively drive the link with a square wave signal. This signal can be modulated to convey data information to the implanted receiver coil beneath the skin.

REFERENCES:
patent: 3195540 (1965-07-01), Waller
patent: 3796221 (1974-03-01), Hagfors
patent: 4441210 (1984-04-01), Hochmair et al.

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