Implantable Medical Devices With Pocket Electrodes for Pulsed Field Ablation
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Solution Overview
Problem
Implantable medical devices face challenges with persistent infections due to bacteria and pathogens, as antimicrobial coatings lose effectiveness over time, and existing solutions are inadequate for long-term infection management.
Innovation Solution
An active implantable medical device with a pulsed-voltage generator and pocket electrodes creates high voltage gradients (1 kV/cm to 30 kV/cm) for pulsed field ablation, controlled by an electronic controller to target and kill infectious bacteria, while minimizing harm to healthy tissue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antimicrobial coatings are applied to implantable medical devices, then initial infection resistance is improved, but effectiveness is lost over time
Solution Approach 1:
The device delivers pulsed electric fields at specific intervals to maintain continuous infection protection. Rather than relying on a static coating that degrades over time, the system periodically activates high-voltage pulses through pocket electrodes to disrupt bacterial cell membranes and prevent biofilm formation, ensuring ongoing reliability without temporal degradation
Solution Approach 2:
The system changes the physical state and parameters of the treatment approach by applying high-voltage electric fields (1 kV/cm to 30 kV/cm) instead of chemical antimicrobial agents. This parameter change from chemical to physical mechanism provides durable infection control that does not degrade over time, resolving the effectiveness duration limitation of traditional coatings
2Reliability
If high voltage gradients are applied to kill bacteria, then infection treatment effectiveness is improved, but risk of harm to healthy tissue increases
Solution Approach 1:
The system applies high voltage gradients locally only to the pocket tissue surrounding the device where infection is present, rather than systemically or broadly. The pocket electrodes are positioned to concentrate the electric field precisely where needed, achieving effective bacterial killing while minimizing exposure and potential harm to distant healthy tissues through localized field application
Solution Approach 2:
The pulsed delivery of high-voltage gradients allows sufficient time for tissue recovery between pulses, reducing cumulative thermal and mechanical stress on healthy tissues. The periodic activation pattern enables effective infection treatment while allowing healthy tissue to return to baseline states between treatment pulses, minimizing harmful effects
3Duration of action of stationary object
If pulsed field ablation is used to treat infections, then long-term infection management is improved, but device complexity increases
Solution Approach 1:
The implantable medical device is enhanced with multi-functionality by integrating pocket electrodes and pulsed field ablation capability into existing device architectures. The same device serves both its primary function (e.g., pacing, defibrillation, sensing) and the additional function of infection management through pulsed electric field delivery, reducing overall system complexity compared to separate dedicated infection treatment devices
Solution Approach 2:
The system merges the infection treatment function with the existing implantable medical device structure by integrating pocket electrodes into the device housing. This combination consolidates multiple functions (primary device function plus infection management) into a single integrated system, avoiding the need for separate components and reducing overall device complexity while achieving long-term infection management
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
Effectively treats and manages infections by killing bacteria and promoting tissue healing through localized voltage gradients, providing a durable and patient-specific treatment option for implantable medical devices.
Implementation Method 1
an electrical circuit in an interior portion of the device box, the electrical circuit being electrically connected to the plurality of pocket electrodes to apply thereto voltage pulses producing thereat a voltage gradient of at least 1 kV/cm
Data Source
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AI summary
Active implantable medical device including a pulsed-voltage generator and a plurality of pocket electrodes for creating relatively high voltage gradients in the corresponding body pocket. In some examples, the voltage gradients are greater than approximately 3 kV/cm and are sufficient for killing infectious bacteria in the body pocket via pulsed field ablation. The active implantable medical device further includes an electronic controller that is wirelessly programmable to appropriately control various parameters of the pulsed-field-ablation procedure, e.g., in a patient- and infection-specific manner. Various examples of the disclosed active implantable medical device can beneficially be used to reduce the adverse effects of infections associated with implantable medical devices.