Bending sensor for an implantable lead and a heart stimulator with a lead having such a sensor
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United States of America Patent
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Jul 8, 2003
Grant Date -
N/A
app pub date -
May 24, 2000
filing date -
Nov 24, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A sensor arrangement, and a heart stimulator employing such a sensor arrangement, identify bending of an electrode lead. A lead which is implantable in a patient is subjected to bending due to movement of the surrounding tissue, and the lead has a deformation sensor therein which emits an electrical signal dependent on the magnitude and orientation of the bending. The deformation sensor can be formed by two parallel channels extending from the tip of the lead within an insulating sleeve of the lead which encloses a conductor element. The channels are filled with an electrically conductive fluid and are connected at their opposite ends to a resistance measuring unit. Bending of the lead causes the resistance of the fluid to change, which is measured by the resistance measuring unit. The channels can be disposed asymmetrically relative to a longitudinal axis of the lead, so that orientation of the bending can also be identified by comparing signals from the respective channels to each other.
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