Impedance Monitoring For Detecting Pulmonary Edema And Thoracic Congestion
First Claim
1. An implantable medical device comprising:
- a housing for the implantable device sized for implantation in a chest region of a patient and comprising a housing electrode;
a left ventricular lead port into which a proximal end of a lead is connectable, the lead having first and second conductors that are insulated from one another and that extend from the proximal end of the lead to corresponding first and second electrodes positioned near a distal end of the lead; and
an electrical impedance measurement circuit electrically connected to the left ventricular lead port and to the housing electrode, the circuit to inject current between the first lead electrode and the housing electrode, and to measure a voltage potential between the second lead electrode and the housing electrode, the voltage potential created by the current injection.
1 Assignment
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Accused Products
Abstract
An implantable medical device includes a housing for the implantable device that is sized for implantation in a chest region of a patient and includes a housing electrode. A left ventricular lead port is connectable to a proximal end of a lead having first and second insulated conductors that extend from the proximal end of the lead to corresponding first and second electrodes near a distal end of the lead. An electrical impedance measurement circuit is electrically connected to the left ventricular lead port and the housing electrode. The circuit may inject current between the first lead electrode and the housing electrode, and measure a voltage potential, created by the current injection, between the second lead electrode and the housing electrode. The ratio of the measured voltage to injected current may be used for assessing pulmonary edema. The lead electrodes may be located in a left ventricular coronary vein.
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Citations
2 Claims
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1. An implantable medical device comprising:
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a housing for the implantable device sized for implantation in a chest region of a patient and comprising a housing electrode; a left ventricular lead port into which a proximal end of a lead is connectable, the lead having first and second conductors that are insulated from one another and that extend from the proximal end of the lead to corresponding first and second electrodes positioned near a distal end of the lead; and an electrical impedance measurement circuit electrically connected to the left ventricular lead port and to the housing electrode, the circuit to inject current between the first lead electrode and the housing electrode, and to measure a voltage potential between the second lead electrode and the housing electrode, the voltage potential created by the current injection.
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2-28. -28. (canceled)
Specification