Lead-Carried Proximal Electrode for Quadripolar Impedance Monitoring
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Solution Overview
Problem
Existing implantable medical devices face increased cost and complexity in designing quadripolar transthoracic impedance monitoring systems due to the need for two electrically isolated electrodes on the device canister.
Innovation Solution
The solution involves forming at least one electrode on a lead proximate to the device canister, reducing the need for customized canister designs and simplifying the manufacturing process while maintaining quadripolar transthoracic impedance monitoring capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two electrically isolated electrodes are provided on the device canister for quadripolar measurement, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The electrode system is segmented into four separate electrodes distributed across the lead and canister, rather than requiring two electrodes on the canister. This allows the measurement function to be distributed across multiple components, reducing the complexity burden on any single component while maintaining the quadripolar measurement capability.
Solution Approach 2:
The lead is given multiple functions: it serves both as an electrical connection to the heart and as a carrier for measurement electrodes. By making the lead multi-functional, the canister does not need to carry all measurement electrodes, thereby reducing canister complexity while preserving measurement precision.
2Measurement precision
If two electrically isolated electrodes are provided on the device canister, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The measurement electrode system is segmented across different components (lead and canister), allowing standard manufacturing processes to be used for each component independently. This avoids the need for specialized canister manufacturing that would be required to integrate two electrically isolated electrodes into a single canister structure.
Solution Approach 2:
Instead of creating a specialized canister design with integrated electrodes, the patent uses a standardized lead design that can be manufactured using existing processes. The lead serves as a template or copy of a proven, manufacturable component rather than requiring a new canister design.
3Measurement precision
If two electrically isolated electrodes are provided on the device canister, then measurement precision is improved, but design complexity increases
Solution Approach 1:
The electrode system is segmented so that electrical isolation requirements are distributed rather than concentrated. The lead provides natural electrical isolation from the canister, and the measurement is performed across four electrodes rather than requiring two isolated electrodes on the canister, simplifying the isolation design.
Solution Approach 2:
The lead acts as an intermediary component that carries measurement electrodes without requiring direct electrical isolation within the canister. This mediator approach allows the measurement function to be achieved while avoiding the complex isolation requirements that would be necessary if both measurement electrodes were on the canister.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the expense and complexity of implementing quadripolar transthoracic impedance monitoring by utilizing a customized lead with an electrode, maintaining performance without the need for customizing the canister, thus lowering production costs and design intricacies.
Implementation Method 1
monitoring the voltage differential between pairs of spaced electrodes as current pulses are injected into leads connected to the electrodes
Implementation Method 2
a voltage differential may be measured between a tip electrode of the pacemaker and the conductive canister
Data Source
AI summary
An implantable medical device (IMD) provides quadripolar transthoracic impedance measurement capability by forming at least one of the two electrodes associated with the canister of the device on a lead proximate the canister.