Leadless Pacemaker Electronics Housing Hermetic Seal Design
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Solution Overview
Problem
Conventional cardiac pacing systems face issues such as unsightly subcutaneous pulse generators, complex surgical procedures, lead breakage, and insulation damage due to repeated movement, which affect the reliability and aesthetics of pacemaker implantation.
Innovation Solution
A leadless pacemaker design featuring a self-contained, hermetically sealed housing with retaining features to secure an electronics package, eliminating the need for a separate metallic frame and reducing manufacturing complexity and cost, and allowing for direct implantation on or near the heart with integrated electrodes and power sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pulse generator is implanted subcutaneously, then cardiac pacing function is provided, but it creates a visible skin bulge that is unsightly and unpleasant for patients
Solution Approach 1:
The conventional pulse generator system is segmented into distributed components: the pulse generator electronics are integrated with the lead electrodes at the implant site, while the power source (battery) is implanted separately in the abdominal region. This segmentation eliminates the visible pectoral bulge while maintaining pacing functionality through wireless or wired communication between components.
Solution Approach 2:
The system transitions from a single-location implant (pectoral region) to a multi-location distributed architecture. The power source is relocated to the abdominal dimension, separate from the pacing electronics at the heart, distributing the system's physical footprint across different spatial dimensions to eliminate cosmetic concerns.
2Shape
If the pulse generator is placed sub-muscularly or in the abdomen, then the skin bulge issue is addressed, but the surgical procedure becomes more difficult and patient recovery is prolonged
Solution Approach 1:
The implantation procedure is segmented into separate stages: first implanting the lead electrodes and pacing electronics in the heart region, then separately implanting the power source in the abdomen. This segmentation allows each component to be implanted through optimized, less invasive approaches rather than requiring complex single-stage surgery for combined placement.
3Reliability
If conventional leads are used to connect the pulse generator to the heart, then cardiac pacing is achieved, but the leads are susceptible to breakage and insulation damage from repeated movement
Solution Approach 1:
The lead electrodes and pulse generator electronics are merged into an integrated assembly at the implant site. This integration eliminates the long external lead conductors that are vulnerable to mechanical stress, as the electrodes are directly connected to the electronics housing through short, protected internal connections within the sealed unit.
Solution Approach 2:
The vulnerable external lead body is extracted from the system by integrating the electrodes directly into the pulse generator housing. The electrodes are positioned through the housing wall or integrated into the housing structure itself, eliminating the need for long external conductors that traverse tissue and are susceptible to mechanical damage.
4Reliability
If a hermetic seal is provided for the electronics package, then protection from environmental damage is achieved, but manufacturing complexity increases
Solution Approach 1:
The hermetic seal is merged with the electronics package housing itself, forming an integrated sealed unit. The housing serves dual functions as both the structural container for electronics and the hermetic barrier, eliminating the need for separate sealing components and reducing manufacturing steps compared to assembling separate sealed chambers.
Data Source
AI summary
The present disclosure provides leadless pacemaker systems and methods. A leadless pacemaker includes a battery subassembly, a feedthrough subassembly, and an electronics subassembly coupled between the battery subassembly and the feedthrough subassembly, the electronics subassembly including an electronics package, and a housing configured to provide a hermetic seal and comprising a first retaining feature and a second retaining feature configured to secure the electronics package within the housing.