Implantable Medical Lead Fixation Elements Interior Surface
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Solution Overview
Problem
Existing medical lead systems face challenges in preventing migration after implantation, which can lead to reduced therapeutic efficacy and potential nerve damage due to inflammation or unintended damage from electrode displacement.
Innovation Solution
The implementation of an implantable medical elongated member with fixation elements on its interior surface, oriented to face inwardly away from the epidermis or scalp, minimizing stress points and ensuring the electrodes remain proximate to the target site, thereby reducing migration and maintaining effective therapy delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If fixation elements are added to the medical lead to prevent migration, then the stability and position of the lead is improved, but the risk of causing stress points and damage to the epidermis or scalp increases
Solution Approach 1:
The patent applies local quality by configuring fixation elements to be distributed about less than a full outer perimeter of the lead body, creating zones with and without fixation elements. This allows the lead to have anchoring capability in specific regions while leaving other regions smooth to prevent epidermal damage. The non-uniform distribution of fixation elements addresses both migration prevention and tissue protection needs in different locations.
Solution Approach 2:
The patent employs asymmetry by orienting the lead such that the exterior surface (facing the epidermis) has reduced or no fixation elements compared to the interior surface. This asymmetric configuration ensures that the side contacting sensitive tissue is smoother and less likely to cause stress points, while the opposite side provides sufficient anchoring to prevent migration.
2Object-affected harmful factors
If fixation elements are distributed about less than a full outer perimeter of the lead body, then the risk of epidermis damage is reduced, but the anchoring capability of the lead may be compromised
Solution Approach 1:
The patent concentrates fixation elements in specific angular distributions (e.g., 120 degrees or less of the full perimeter) rather than uniformly distributing them around the entire lead. This creates localized anchoring zones that provide sufficient holding power while leaving other zones free of fixation elements to prevent epidermal stress and damage.
3Stability of the object's composition
If the lead is secured at the target stimulation site to minimize migration, then the position stability is improved, but the complexity of the fixation mechanism increases
Solution Approach 1:
The patent inverts the conventional approach by making the lead body itself provide the fixation function through its surface configuration, rather than adding separate complex fixation mechanisms. The fixation elements are integrated into the lead body's outer surface, and the lead's orientation and implantation method are designed to utilize gravity and tissue interaction for stabilization, simplifying the overall system.
Data Source
AI summary
An implantable medical elongated member includes a first outer surface portion and a second outer surface portion extending around at least ten percent of an outer perimeter of the elongated member. A fixation element extends a distance from the first outer surface portion of the implantable medical elongated member. A longitudinally-extending section of the second outer surface portion proximate to a distal end of the elongated member is substantially devoid of any fixation elements that extend the distance from second outer surface portion.