Switching Unit for Implantable Defibrillation Electrode Lead
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Solution Overview
Problem
Existing implantable defibrillation devices face challenges in reducing electrode lead diameter and stiffness due to the need for high-voltage insulation, limiting their flexibility and ease of use in various clinical applications.
Innovation Solution
Incorporating a switching unit that automatically switches sensing electrodes to the potential of the defibrillation electrode during high-voltage shock delivery, reducing the required insulation and allowing for a thinner, more flexible electrode lead design, which can be implemented within the defibrillation device or the electrode lead itself, utilizing components like varistors for automatic voltage-dependent switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating clearances are maintained for high voltage in electrode leads, then high voltage insulation is ensured, but electrode lead diameter cannot be reduced and flexibility is limited
Solution Approach 1:
The patent applies the dynamics principle by making the insulation requirement dynamic rather than static. A switching unit is introduced that dynamically changes the electrical potential of sensing electrodes to match the defibrillation electrode potential during high-voltage shock delivery. This dynamic potential equalization temporarily eliminates voltage differences, allowing insulation clearances to be reduced or eliminated in the lead design while maintaining reliability during critical operations.
Solution Approach 2:
The patent changes the electrical parameter (potential) of the sensing electrodes from a fixed state to a variable state. By using a switching unit that responds to high-voltage conditions, the potential of sensing electrodes is changed to match the defibrillation electrode potential during shock delivery. This parameter change allows the insulation requirements to be relaxed, enabling thinner and more flexible electrode leads while maintaining high-voltage insulation reliability when needed.
2Reliability
If insulating clearances are maintained for high voltage in electrode leads, then high voltage insulation is ensured, but electrode lead diameter cannot be reduced
Solution Approach 1:
The patent makes the insulation requirement dynamic by introducing a switching unit that equalizes potentials during high-voltage shock delivery. This dynamic approach allows the lead diameter to be reduced because the insulation clearance requirement is temporarily eliminated when the switching unit equalizes the potential of sensing electrodes with the defibrillation electrode, while still maintaining reliability during critical operations.
Solution Approach 2:
The patent changes the electrical potential parameter of sensing electrodes during high-voltage events, allowing the physical dimension (lead diameter) to be reduced. The switching unit modifies the potential parameter dynamically, enabling thinner leads that would otherwise require larger insulation clearances, thus resolving the contradiction between insulation reliability and lead diameter reduction.
3Ease of operation
If a switching unit is added to switch sensing electrodes to defibrillation electrode potential, then insulation requirements are reduced and lead flexibility improves, but device complexity increases
Solution Approach 1:
The patent applies the self-service principle by designing a switching unit that automatically responds to high-voltage conditions without requiring external control. The switching unit is configured to detect the high-voltage state and automatically equalize the potential of sensing electrodes with the defibrillation electrode potential. This self-activating mechanism reduces control complexity while achieving the goal of improved lead flexibility and reduced insulation requirements.
Solution Approach 2:
The switching unit acts as an intermediary component that mediates between the defibrillation electrode and sensing electrodes. It automatically activates under high-voltage conditions to equalize potentials, thereby reducing insulation requirements and improving lead flexibility. The intermediary switching unit simplifies the overall system by providing automatic protection and potential equalization without requiring complex external control mechanisms.
4Length of stationary object
If a switching unit is added to switch sensing electrodes to defibrillation electrode potential, then insulation requirements are reduced and lead diameter can be reduced, but device complexity increases
Solution Approach 1:
The switching unit is designed to automatically respond to high-voltage conditions and equalize potentials without external control, enabling lead diameter reduction while minimizing control complexity. This self-activating mechanism allows the use of thinner leads with reduced insulation requirements while avoiding the need for complex control systems.
Solution Approach 2:
The switching unit serves as an intermediary that automatically mediates potential differences during high-voltage events, enabling thinner lead design. By providing automatic potential equalization, it reduces insulation requirements and allows diameter reduction without requiring complex external control mechanisms, thus balancing the trade-off between lead thinning and device complexity.
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 enables the creation of electrode leads with reduced diameter and stiffness, enhancing the performance and versatility of implantable cardioverter-defibrillator (ICD) and cardiac resynchronization therapy-defibrillator (CRT-D) systems by minimizing insulation and allowing for more effective shock delivery.
Implementation Method 1
the switching unit comprises a varistor, such as a varistor composed of sintered ceramic of the SiC or ZnO type
Data Source
AI summary
An implantable defibrillation arrangement comprising a defibrillation device having a sensing component and a defibrillation component, and an electrode lead comprising a lead body, a plug, a sensing electrode for sensing cardiac action potentials with a first electrode supply lead, and a defibrillation electrode for transmitting shock pulses to cardiac tissue with a second electrode supply lead, wherein a switching unit is provided to switch the sensing electrode to the potential of the defibrillation electrode in response to the output of a defibrillation shock by the defibrillation component.