Voltage independent measurement apparatus, system, and method
AssigneeCardiac Pacemakers, Inc.
InventorNicholas J. Stessman
Life of this patent
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Abstract
A cardiac rhythm management apparatus may include a monitored energy source, a reference energy source, and a measurement module. The monitored source provides an initial pacing amplitude voltage and a pacing droop voltage, while the reference source provides a substantially fixed reference voltage. The measurement module, coupled to the monitored source and the reference source, provides a measurement related to the lead impedance associated with the rhythm management apparatus that is substantially independent of the reference voltage. Thus, a system may include the apparatus coupled to a lead wire. An article may cause a machine to implement a method which operates to determine a ratio of the actual initial pacing amplitude voltage to the actual pacing droop voltage.
Claims27
An apparatus, comprising:
- a monitored energy source providing a first indication associated with an actual initial pacing voltage and a second indication associated with a actual pacing droop voltage;
- a reference energy source to provide a reference indication;
- and
- a measurement module coupled to the monitored energy source and the reference energy source, the measurement module to provide a third indication associated with a ratio of the first indication and the second indication, the ratio being substantially independent of the reference indication.
A system, comprising:
- an apparatus, including a monitored energy source providing a first indication associated with an actual initial pacing voltage and a second indication associated with an actual pacing droop voltage, a reference energy source to provide a reference indication value, and a measurement module coupled to the monitored energy source and the reference energy source, the measurement module to provide a third indication associated with a ratio of the first indication and the second indication, the ratio being substantially independent of the reference indication;
- and
- a lead wire electrically coupled to the measurement module.
A method, comprising:
- determining a first sum of an actual initial pacing voltage and a reference indication;
- determining a second sum of an actual pacing droop voltage and the reference indication;
- and
- determining a ratio of the first sum and the second sum which is substantially independent of the reference indication.
An article comprising a machine-accessible medium having associated data, wherein the data, when accessed, results in a machine performing:
- determining a first sum of an actual initial pacing voltage and a reference indication;
- determining a second sum of an actual pacing droop voltage and the reference indication;
- and
- determining a ratio of the first sum and the second sum which is substantially independent of the reference indication.
A method, comprising:
- determining an actual initial pacing voltage;
- determining an actual pacing droop voltage;
- and
- determining a ratio of the actual initial pacing voltage to the actual pacing droop voltage by balancing accumulated charges, wherein the ratio is substantially independent of a reference indication.
Dependencies are inferred from the claim text.