Voltage independent measurement apparatus, system, and method
First Claim
1. A cardiac measurement 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, wherein the measurement module comprises a sampler to sample a sum of the first indication and the reference indication and a converter coupled to the sampler, the converter to generate the third indication derived from the sum, and wherein the sampler and the converter are included in a successive approximation analog to digital converter.
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Accused Products
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.
7 Citations
16 Claims
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1. A cardiac measurement apparatus, comprising:
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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, wherein the measurement module comprises a sampler to sample a sum of the first indication and the reference indication and a converter coupled to the sampler, the converter to generate the third indication derived from the sum, and wherein the sampler and the converter are included in a successive approximation analog to digital converter. - View Dependent Claims (2)
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3. A cardiac measurement system, comprising:
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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; a lead wire electrically coupled to the measurement module; and an attenuator electrically coupled between the monitored energy source and the measurement module, wherein the attenuator is capable of attenuating a magnitude associated with the actual initial pacing voltage by a factor of K≦
1.0.
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4. A cardiac measurement method, comprising:
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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; determining a ratio of the first sum and the second sum which is substantially independent of the reference indication; and attenuating a value associated with the actual initial pacing voltage.
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5. A cardiac measurement apparatus, comprising:
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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; 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 successive approximation analog to digital converter to store the third indication derived from a sampled sum of the first indication and the reference indication. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A cardiac measurement method, comprising:
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determining a first sum of an actual initial pacing voltage and a reference indication; storing a sampled version of the first sum in a successive approximation analog-to-digital converter; 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. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification