Leadless Pacing Device Extension for Biventricular Pacing
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Solution Overview
Problem
Current cardiac pacing systems, particularly leadless pacing devices, face challenges in providing effective biventricular pacing and sensing across multiple heart chambers without the need for external leads, which limits their ability to deliver comprehensive cardiac stimulation and monitoring.
Innovation Solution
The development of an implantable medical device (IMD) system with an extension that includes electrodes for sensing and stimulation, allowing for biventricular pacing by positioning electrodes within or proximate to different heart chambers, utilizing a tether and guidewire mechanism for precise placement, and a pusher for controlled housing positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a leadless pacing device is used, then the device complexity and risk of lead fracture are reduced, but the ability to provide biventricular pacing and sensing across multiple chambers is limited
Solution Approach 1:
The pacing device is divided into two separate components: a leadless IMD implanted in one chamber and a separate extension housing with electrodes implanted in another chamber. This segmentation allows each component to be optimized for its specific function while collectively achieving biventricular pacing capability without requiring traditional transvenous leads
Solution Approach 2:
A tether serves as an intermediary mechanism during the implantation process, allowing the extension housing to be delivered and positioned through the venous system alongside the IMD. The tether is temporarily used to guide and secure the extension in place during implantation, then removed after deployment, leaving the two components electrically connected but mechanically independent
2Adaptability or versatility
If an extension with multiple electrodes is added to the IMD, then biventricular pacing capability is achieved, but the device complexity increases
Solution Approach 1:
The extension housing with its electrodes is electrically merged with the IMD through conductive connections, allowing the IMD to control and sense through both its own electrodes and the extension's electrodes. This merging enables biventricular pacing functionality while maintaining a unified control system within the IMD
Solution Approach 2:
The extension housing serves multiple functions: it provides additional electrodes for biventricular pacing, acts as a delivery mechanism for itself during implantation, and can be positioned in different chambers depending on the patient's specific needs. This multi-functionality reduces the need for separate dedicated components
3Manufacturing precision
If a tether and guidewire mechanism is used for placement, then precise positioning is achieved, but the ease of operation during implantation is reduced
Solution Approach 1:
The tether is pre-threaded through the extension housing before implantation begins. This preliminary action ensures that the tether is already in place to guide and secure the extension, eliminating the need for complex manipulation during the critical positioning phase and streamlining the overall implantation procedure
Data Source
AI summary
In some examples, a system includes an implantable medical device configured for implantation in a chamber of the heart, an extension attached to the implantable medical device, the extension comprising a housing comprising at least one electrode, the housing defining a hole, and a tether comprising a first tether portion and a second tether portion and configured to be threaded through the hole. When the tether is threaded through the hole, the first tether portion and the second tether portion are on opposite sides of the hole. The tether may be used to implant the extension in a different chamber of the heart of the patient than the implantable medical device.