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US 7,945,318 B2Granted
Peripheral impedance plethysmography electrode and system with detection of electrode spacing
AssigneeSmithmarks, Inc.
InventorsMichael Smith, Lloyd A. Marks
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Abstract
In a system and method for peripheral impedance plethysmography, an electrode for application to the patient's limb includes two outer current electrodes and two inner voltage electrodes. A distance between the two inner electrodes is automatically input into an analyzing device, either as a pre-stored value or as determined automatically from the electrode. Peripheral blood flow is calculated in accordance with that distance.
Claims17
A method for peripheral impedance plethysmography, the method comprising:
- (a) attaching an electrode to an extremity of a patient, the electrode comprising two outer current electrodes and two inner voltage electrodes;
- (b) applying an alternating current to the two outer current electrodes;
- (c) measuring a voltage in each of the two inner voltage electrodes induced by the alternating current;
- (d) automatically receiving, in a processing device, the voltage measured in step (c) and a value of a distance between the two inner voltage electrodes, wherein the value of the distance is automatically received in the processing device by automatically generating a signal representing the value of the distance and automatically receiving the signal into the processing device;
- and
- (e) calculating, in the processing device, a volume change in the extremity in accordance with the voltage measured in step (c) and the value of the distance received in step (d) such that a result of said calculating depends on the value of the distance.
3 more elements
Dependencies are inferred from the claim text.