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DESCRIPTION JPS56105981

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DESCRIPTION JPS56105981
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side cross-sectional view showing the use of
the drive transducer of the present invention in a full implantable hearing aid. FIG. 2A, a side
cross-sectional view showing an embodiment of the drive transducer of the present invention.
Fig. 2B is the same (plan view). FIG. 3 is a perspective view showing the coupled state of the
driving transducer and the butt bone according to the present invention. 3A: pedestal, 3B:
element, 3C: joint.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive transducer
for use in a hearing aid intended for implantation in a living body. Currently, tympanoplasty
plastic surgery is widely used to improve hearing for the loss of middle ear conduction devices
due to otitis media and other diseases, and in most cases the patients with 9 severe otitis media
are not only sound transfer systems but also senses. The system is also impaired, and
tympanoplasty surgery alone can not be expected to improve hearing ability sufficiently, and in
fact, it requires a supplementary 1- ', /' hearing device even after surgery. In addition, there are
cases where the improvement of hearing in the high-pitched area is not remarkable by
tympanoplasty molding surgery, and also the use of a hearing aid after surgery has become a
reality. On the other hand, even though such a hearing aid is sufficiently useful in the sense of
compensating for the lack of auditory function, a disorder caused by the wearer's own sense of
indeterminacy or depression with the wearing of an earphone or [2] or noticeable There is still
unresolved envy about issues such as the consciousness of people. Furthermore, there are many
types of hearing impairments, and the problems with existing hearing aids are pointed out, such
as being difficult to match with the choice of hearing aids, because there are many types, and so
on. And, along with the long-term progress to ultra-miniaturization of electric circuits, the
development of ultra-small hearing aids that can be implanted in the body is underway. 2) This
implantable sleeve hearing device is basically composed of four elements of (1) microphone (2)
amplifier (3) battery (4) 1 driving transducer, and classified according to system. A method of
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sending a signal to a driving transducer by electromagnetic coupling by placing only a driving
stripe / line, a sensor inside a cow, and other elements 2- outside the body, or a microphone.
From a so-called semi-implant type such as a method of embedding an amplifier and a driving
transducer in a living body and placing only a battery out of the body to facilitate battery
exchange, a totally implanted type in which all four elements are implanted in a living body
Several methods are conceivable, but in any case this implantable hearing aid performs signaling
instead of one of the patients whose acoustic signals do not reach the inner ear efficiently
because of defects in the outer or middle ear. In some cases, the role of the transducer that
ultimately drives the inner ear lymph fluid is important, and this has an extremely significant
impact on the characteristics of the implant-type hearing aid. The present invention relates to
this drive transducer. By the way, as a site to drive the inner ear lymphatic fluid, a non-circular
window which is a stimulation port of the original inner ear is suitable, and one device utilizes a
rabbit bone remaining in the non-circular window. That is, by fixing one end of the drive
transducer of the two inventions to the hourglass-shaped wall near the non-circular window and
connecting the other end to the bone head of a 3-bone bone, the vibration stimulation generated
by the transducer is inner ear lymph fluid To tell.
The present invention relates to a driving transducer having an optimum structure for coupling
with the above-described buttock bone head, and one embodiment of the present invention will
be described with reference to the drawings. Figure J1 is a side cross sectional view showing the
use of the drive transducer in a full implantable hearing aid. The sound that has entered the
microphone 1 is converted into an electrical signal through a sound processing device 2
including an amplifier 9. It is transmitted to the driving transducer 3 to generate vibration. The
drive transducer 3 is fixed at one end and is connected at the other end to the stave bone 4. 5 is
an ear canal, 7 is a tympanic membrane, 8 is a middle ear cavity, and 9 is a ring (· Fig. 2A, Fig. 2B
are an 11111 plane view and a plan view of a driving transformer). The transducer 3 is
composed of 9 pedestals 3A, Niremets): 3B, and 31 pedestals 3A composed of the coupling
portion 3C, fixed to one end of the relief 4) 3B, and the drive transducer is shaped like an
hourglass near the non-circular window. Do not fix it on the wall. It is made of, for example,
apatite or the like material in consideration of bio-innocence or reliable bonding to the hourglassshaped wall. The pedestal 3A has its bottom surface fixed to the hourglass-shaped wall by an
appropriate means such as an adhesive. At this time, if the hourglass-shaped wall surface is
scraped into a hemispherical shape and the pedestal 3A is hemispherically shaped to conform to
the hemispherical portion, the nine pedestals 3A can be set at an arbitrary angle, and the
combined angle--portion 30 ' 61 ′ ′ ′ ′ ′ ′ ′ ′ ′ Easy to connect. It is fixed to the
hourglass-shaped wall by an appropriate means such as an adhesive. The element 3B is, for
example, a bending vibrator such as a piezoelectric bimorph-monolithic element. The
piezoelectric bimorph element is formed by sticking a pair of rectangular piezoelectric plates
polarized in the thickness direction so as to be polarized in opposite directions to each other. An
electrode is provided. Note that this nilemene 3B is joined with the other end of the soft
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biocompatible material which does not interfere with the bending vibration of the element 3B
itself, for example, the urethane resin 3C, and the other end of the nirel 3B. As shown in the
figure, the bending vibration of the lens element 3B is directly transmitted to the bone head 4A
of the acupuncture bone 4. The connecting portion 3C is a bio-binding material and in the shape
of a rigid material, for example, a stainless steel, which is in the form of a bent cone. B-shaped t7'1 painted coat is connected to bone head 4A'tgfi □ 1 □ +] through the annulus of stamen 4 4
In the case of connecting all the lines, the connecting portion 3C is to be pulled out by 8 lines
and 4 'ji 7 j. Fixation between the base 3A and the element 3B and fixation between the joint
portion 3C and the nilemene 3B are performed by an appropriate means such as an adhesive safe
to the living body in consideration of biocompatibility.
Also Riet line IO, also considering the biocompatibility. Silver wire coated with Teflon etc.,
stainless steel wire etc. are used. As described above, the present invention is a drive transformer
having a connecting portion in the form of a truncated cone whose tip is bent, and the
configuration is simplified to easily achieve vibration transmission to the hump bone, and the
connecting portion It is noted that the joint fixation with the rabbit bone is not released, which is
useful 6-.
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