Electrode for implantation into the cochlea (II)

Details Electrode for implantation into the cochlea (II) Electrode for implantation into the cochlea (II)

1978-11-13

1981-08-18

Cohen, Lee S.

Surgery

Truss

Pad

179107R, A61N 104

Patent

active

042840856

ABSTRACT:
An electrode for implantation into the cochlea. The purpose is to establish electrical communication to the acoustic nerves of the human ear, substantially in the area of the cochlea containing the acoustic nerves pertaining to that part of the audible spectrum, which is relevant to the intelligibility of speech. The problem is, that an electrode inserted into the cochlea certainly has made it possible to bring the patient in such a condition that she or he could interpret electrical signals supplied through the electrode as being sound but not as being intelligible speech.
The invention provides an electrode, which has two conditions of curvature, the one of which is temporary and corresponds to the curvature in the middle of the particular turn of the cochlea and the other one of which is permanent and corresponds to the first position of the electrode in the cochlea in which position it obtains an optimum contact to the acoustic nerves. The electrode of the invention further contains elements for changing the condition of curvature from the temporary one to the permanent one, when the electrode has been inserted into the cochlea. The permanent condition of curvature is constituted by the electrode's natural condition of curvature whereas the temporary condition of curvature is established by means of a detachable or loosenable connection, which, until it is detached or loosened, maintains the temporary condition of curvature. A quick and reliable operation is made possible and the probability of obtaining a uniform communication over various frequency ranges along the cochlea is greatly increased.

REFERENCES:
patent: 3752939 (1973-08-01), Bartz
patent: 3890977 (1975-06-01), Wilson
Sonn et al., "A Prototype Flexible Microelectrode . . . ", Med. & Bio. Eng., Nov. 1974, pp. 778-790.

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