Subcutaneous Lead Fixation Structures for Secure Implant
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Solution Overview
Problem
Existing implantable defibrillator systems face challenges with transvenous lead placement and durability, as well as difficulties in electrode placement and removal, prompting the need for new subcutaneous lead designs and fixation methods to avoid these issues.
Innovation Solution
The development of subcutaneously implantable leads with various fixation structures, such as suture sleeves, Y-shaped fixation structures, and flexible arms, which can be anchored in subcutaneous tissue using sutures or other attachment features, allowing for secure implantation and potential for easier extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If transvenous leads are used for implantable defibrillators, then the invasive procedure is avoided compared to epicardial placement, but difficulties in electrode placement and lead durability occur
Solution Approach 1:
The patent introduces fixation structures (sutures, anchors, fixation members) as intermediary elements between the lead and the body tissue (veins, heart wall, or subcutaneous tissue). These fixation structures serve as mediators that securely attach the lead to stable anatomical structures, improving lead durability and placement reliability without requiring direct invasive attachment to the heart exterior.
2Ease of manufacture
If epicardial electrodes are attached to the exterior of the heart, then direct electrode placement is achieved, but invasive procedure and long-term attachment problems occur
Solution Approach 1:
The patent extracts the fixation function from the lead itself and implements it through separate, dedicated fixation structures (sutures, anchors, fixation members). This allows the lead to be a simpler component while the fixation structures handle the complex attachment task, reducing overall device complexity and making the attachment procedure more standardized and manageable.
3Reliability
If subcutaneous-only systems are used, then transvenous leads are avoided, but new fixation methods and designs are required
Solution Approach 1:
The patent segments the lead system into distinct functional components: the lead body, fixation structures (sutures, anchors, fixation members), and electrode elements. This segmentation allows each component to be optimized independently - the fixation structures can be designed specifically for subcutaneous tissue attachment without compromising the lead's electrical function, thereby achieving reliable subcutaneous implantation with manageable design complexity.
Data Source
AI summary
New and/or alternative designs for implantable leads that have fixation structures to keep leads at a desired location after implant. Fixation structure may take several forms that create distally located fixation for use primarily in subcutaneous implantation. Some examples include new and/or alternative methods of implanting such leads. Some examples also include fixation structures, such as a suture sleeve, that can be attached to a lead for fixation thereof. Some further examples show methods of implanting a subcutaneous lead, and others include methods of extracting implanted subcutaneous leads.