CPC A61N 1/36521 (2013.01) [A61B 5/0538 (2013.01); A61N 1/056 (2013.01); A61N 1/365 (2013.01); A61N 1/368 (2013.01); A61N 1/3684 (2013.01); A61N 1/36585 (2013.01); A61N 1/3752 (2013.01); A61N 1/37223 (2013.01); A61N 1/37235 (2013.01); A61N 1/37247 (2013.01); A61N 1/37252 (2013.01)] | 14 Claims |
1. Implantable medical device for stimulating a human or animal heart, comprising a housing, an analog-to-digital converter, a processor, a memory unit, a stimulation unit configured to stimulate the His bundle of a human or animal heart, and a detection unit configured to detect an electrical signal at the His bundle of the same heart, wherein the detection unit comprises an electrode having a first electrode pole and a second electrode pole,
wherein
the memory unit comprises a computer-readable program that causes the processor to perform the following steps when executed on the processor:
a) determining, by the detection unit, a first value of at least one parameter of a first measuring pulse generated by the stimulation unit, the first value measured between the first electrode pole and the housing;
b) determining, by the detection unit, a second value of the same at least one parameter of a second measuring pulse generated by the stimulation unit, the second value measured between the first electrode pole and the second electrode pole;
c) comparing the first value of the at least one parameter of the first measuring pulse to the second value of the at least one parameter of the second measuring pulse;
d) determining, based on the comparing of the preceding step, whether the first measuring pulse or the second measuring pulse enables a higher available level control range of the analog-to-digital converter;
e) measuring an impedance in a unipolar manner between the first electrode pole and the housing when the first measuring pulse enables a higher available level control range of the analog-to-digital converter than the second measuring pulse; and measuring an impedance in a bipolar manner between the first electrode pole and the second electrode pole when the second measuring pulse enables a higher available level control range of the analog-to-digital converter than the first measuring pulse.
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