Neurostimulation Lead Migration Detection via Tissue Impedance
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Solution Overview
Problem
Conventional neurostimulation systems lack effective methods to detect lead migration and provide accurate information about the relative positions of implanted leads, making reprogramming difficult and prone to trial and error.
Innovation Solution
The system measures artifactual tissue data such as tissue impedance and physiologically evoked potential data to detect lead migration, providing specific information about the magnitude and direction of movement, allowing for more precise reprogramming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional neurostimulation systems are used without migration detection, then the system structure remains simple, but the ability to detect lead migration and provide accurate position information is lost
Solution Approach 1:
The patent uses an intermediary measurement approach by introducing a separate measurement lead that does not provide therapy but specifically measures artifactual tissue data. This measurement lead acts as a mediator between the therapeutic leads and the detection system, enabling precise lead position detection without requiring the therapeutic leads themselves to perform measurement functions, thus maintaining a clear division of functions and manageable system complexity.
Solution Approach 2:
The patent replaces direct mechanical or visual inspection methods for lead positioning with an electrical field-based measurement system. By using artifactual tissue data measurements (impedance, evoked potentials) through the measurement lead, the system substitutes physical examination or imaging techniques with electrical field interactions, enabling non-invasive, continuous monitoring of lead positions through physiological responses.
2Loss of time
If trial and error reprogramming is used without migration detection, then the reprogramming process becomes time-consuming and inefficient, but adding detection capabilities increases device complexity
Solution Approach 1:
The system performs preliminary measurements of artifactual tissue data before reprogramming is needed. By continuously or periodically measuring impedance and evoked potentials through the measurement lead, the system establishes baseline data that indicates lead positions in advance. When migration is suspected, this pre-collected data is already available to guide reprogramming decisions, eliminating the need for time-consuming trial and error during the reprogramming session itself.
Solution Approach 2:
The patent implements a feedback mechanism where artifactual tissue data measurements provide continuous information about lead positions. The measurement lead constantly monitors tissue impedance and evoked potentials, and this feedback information is processed to determine lead migration status. This feedback loop enables clinicians to make informed reprogramming decisions based on objective data rather than guessing, significantly reducing reprogramming time and improving efficiency.
3Loss of information
If no lead position information is provided, then the system remains simple to operate, but the physician cannot accurately reprogram the system after migration
Solution Approach 1:
The patent extracts lead position information from the complex physiological signals by specifically measuring artifactual tissue data through the dedicated measurement lead. Instead of trying to extract position information from therapeutic stimulation data or requiring complex imaging, the system separates the measurement function into its own dedicated lead that extracts pure positional information through impedance and evoked potential measurements, leaving the therapeutic leads focused on their primary function.
Solution Approach 2:
The measurement lead performs multiple functions: it measures tissue impedance, records evoked potentials, and provides reference signals for determining lead positions. This single measurement lead serves as a multi-functional tool that collects various types of physiological data all related to lead positioning, eliminating the need for separate measurement systems for each type of data and simplifying the overall information gathering process.
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 provides a reliable indication of lead migration, reducing the difficulty in reprogramming by offering precise information about lead positions, thereby maintaining therapeutic effectiveness and simplifying the process.
Implementation Method 1
determine the relative positions of neurostimulation leads by measuring the impedance of tissue between each neurostimulation lead and an electrode that is located in spaced relation to the neurostimulation leads
Implementation Method 2
measures artifactual data about tissue in the vicinity of an implanted lead, such as a neurostimulation lead, to detect lead migration... Such artifactual tissue data includes tissue impedance data and physiologically evoked potential data
Data Source
AI summary
Apparatus and methods for detecting lead migration through the use of measured artifactual data about the tissue in the vicinity of the lead.