Implantable Atrial Electrode With Vena Cava Device Separation
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Solution Overview
Problem
Existing implantable medical devices face challenges in efficiently positioning electrodes within heart chambers while maintaining sufficient battery capacity and circuit complexity due to spatial constraints, particularly when positioned within the atrium.
Innovation Solution
A medical system comprising a device head with a fixation element and an electrode positioned within the atrium, connected to an implantable medical device in the vena cava via a flexible lead, allowing the device head to engage tissue and maintain proximity to the target site while the IMD remains in the vena cava, utilizing a delivery catheter for intravenous placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the implantable medical device is positioned within the atrium to enable direct electrode placement, then electrode positioning precision is improved, but the device size is constrained limiting battery capacity and circuit complexity
Solution Approach 1:
The system is divided into two separate components: a device head positioned within the atrium that contains the electrode for precise local stimulation, and a larger implantable medical device positioned in the vena cava that houses the battery and circuitry. The flexible lead connects these two segments, allowing each component to be optimized for its specific function without spatial constraints of the other.
2Device complexity
If the implantable medical device is made larger to increase battery capacity and circuit complexity, then device functionality is improved, but the device cannot be positioned within the atrium reducing positioning flexibility
Solution Approach 1:
The system separates the implantable medical device into two parts: a compact device head that can be positioned within the atrium and a larger main body that remains in the vena cava. This segmentation allows the device head to maintain positioning flexibility while the main body can accommodate larger battery and circuit components.
Solution Approach 2:
A flexible lead acts as an intermediary connection between the device head in the atrium and the main implantable medical device in the vena cava. This flexible lead transmits electrical signals and power while accommodating the spatial separation and movement between the two components.
3Reliability
If the device head is secured within the atrium using fixation elements, then electrode stability is improved, but the delivery and implantation process becomes more complex
Solution Approach 1:
The fixation elements are pre-integrated with the device head in a compressed or retracted state during manufacturing. During implantation through the delivery catheter, these fixation elements are held in a non-obtrusive position. Once the device head is positioned within the atrium, the fixation elements are deployed to engage with the atrial tissue, providing stable anchoring without complicating the initial delivery process.
Data Source
AI summary
A medical system including a device head configured to be positioned in an atrium of a heart, an implantable medical device configured to be positioned within a vena cava of the heart, and a lead extending from the device head to the implantable medical device. A fixation element coupled to the device head is configured to engage tissues within the atrium. The device head includes an electrode configured to deliver therapy and/or sensing signals to tissues within the atrium using stimulation signals received from processing circuitry within the implantable medical device. The medical system may include a delivery catheter configured to allow delivery of the device head to the atrium.