Activity sensor for a heart pacemaker
First Claim
1. An activity sensor for use in a heart pacemaker having a housing with at least one flat wall, said activity sensor comprising:
- a flexural type piezoelement having oppositely polarized ceramic parts, each having first and second sides and contacted at both sides with electrodes, said ceramic parts being arranged side-by-side with said first sides facing said flat wall of said housing;
means for electrically connecting said electrodes on said first sides of said ceramic parts to one another;
means for securing said first sides in force-transmitting contact over entire area with said flat wall of said housing; and
said electrodes on said second sides electrically connected to at least first and second terminals so that said piezoelement generates an electrical voltage across said terminals as a measure of activity acting upon the piezoelement through said wall of said housing.
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Accused Products
Abstract
An activity sensor wherein a piezoelement of the flexural type is employed. The activity sensor avoids a depolarization even given great mechanical stresses and simplifies the contacting of such a sensor regardless of the surfaces to which it is applied. It is provided in accord with the invention that the piezoelement is composed of two individual or inter-related piezoceramic parts arranged side-by-side which are oppositely polarized and are provided with electrodes on both sides. On one side, the electrodes are electrically connected to one another and, on the other side, are connected to terminals.
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Citations
5 Claims
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1. An activity sensor for use in a heart pacemaker having a housing with at least one flat wall, said activity sensor comprising:
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a flexural type piezoelement having oppositely polarized ceramic parts, each having first and second sides and contacted at both sides with electrodes, said ceramic parts being arranged side-by-side with said first sides facing said flat wall of said housing; means for electrically connecting said electrodes on said first sides of said ceramic parts to one another; means for securing said first sides in force-transmitting contact over entire area with said flat wall of said housing; and said electrodes on said second sides electrically connected to at least first and second terminals so that said piezoelement generates an electrical voltage across said terminals as a measure of activity acting upon the piezoelement through said wall of said housing. - View Dependent Claims (2, 3, 4, 5)
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Specification