US4896068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Activity sensor for a heart pacemaker
Assignee: Pacesetter AB
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Filing: 1989-04-28
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Granted: 1990-01-23
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Expires: 2009-04-28
Abstract
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.
Inventors
- 👤 Kenth Nilsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:17
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/365; A61N1/36514; A61N1/36542; H; H10; H10N; H10N30/00; H10N30/30; H10N30/302
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
139 words
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.
Claim 2
Dependent Claim
139 words
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.
Claim 3
Dependent Claim
34 words
The activity sensor according to claim 1, wherein said piezoelement is composed of a single plate having first and second sides, said electrodes on said second side having at least one insulating gap therebetween.
Claim 4
Dependent Claim
25 words
The activity sensor according to claim 2, wherein the width of the gap is at least twice as great as the thickness of the plate.
Claim 5
Dependent Claim
14 words
The activity sensor according to claim 1, wherein said means for securing is glue.
Claim 6
Dependent Claim
30 words
The activity sensor according to claim 1, wherein the activity sensor has a predetermined flexural strength relative to said wall of said housing to which the activity sensor is secured.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-22 | 1993-07-24 | 1994-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-22 | 1997-07-24 | 1998-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-22 | 2001-07-24 | 2002-01-23 | $7700.00 | Window Closed / Lapsed |