Epidural Slack Anchor for Lead and Catheter Migration Resistance
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Solution Overview
Problem
Neuromodulation leads and catheters experience migration within the epidural space due to body motions, tensile forces, gravity, and other factors, leading to altered or negated stimulation effects and improper delivery of pharmacological agents.
Innovation Solution
The creation of a slack anchor within the epidural space using a lead or catheter, formed by manipulating a sheath and/or stylet to create serpentine or loop shapes, providing friction and resistance to migration, ensuring the distal end maintains position near the target therapy site.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional SCS leads are positioned within the epidural space and anchored outside the epidural space, then the lead can be implanted with relatively simple procedure, but the lead is free to move along the entire length of the lead from the point of anchor to the tip in any direction within the epidural space causing migration
Solution Approach 1:
The lead is divided into distinct functional segments: a flexible epidural portion for positioning within the epidural space, a transition zone with varying stiffness, and a rigid anchoring portion for secure attachment to bone or tissue. This segmentation allows the lead to be implanted through a relatively simple procedure while the distributed anchoring points along its length prevent migration by distributing mechanical stresses.
Solution Approach 2:
The lead exhibits spatially varying mechanical properties, with different sections having different stiffness characteristics. The epidural portion remains flexible for easy implantation and positioning, while specific anchoring zones have increased stiffness to provide secure attachment points. This local differentiation of mechanical properties resolves the contradiction between ease of implantation and position stability.
2Reliability
If the lead is made more rigid to prevent migration, then the lead position stability improves, but the lead cannot flex with body motions and may cause tissue damage
Solution Approach 1:
The lead features spatially varying mechanical properties where the epidural portion maintains flexibility to accommodate body motions without causing tissue damage, while discrete anchoring zones along the lead have increased stiffness to prevent migration. This local differentiation allows the lead to simultaneously achieve position stability and biocompatibility.
Solution Approach 2:
The lead's mechanical behavior is dynamically adapted through its heterogeneous structure: flexible segments allow dynamic movement with the body, while rigid anchoring segments provide static stability. This dynamic design enables the lead to flex with body motions in compliant regions while maintaining stable positioning through rigid anchoring points.
3Object-affected harmful factors
If the lead is made more flexible to accommodate body motions, then the tissue compatibility improves, but the lead migration risk increases
Solution Approach 1:
The lead is segmented into flexible epidural portions that accommodate body motions for tissue compatibility, and rigid anchoring portions that prevent migration. This segmentation allows the lead to simultaneously achieve both tissue compatibility through flexible movement and position stability through rigid anchoring zones.
Solution Approach 2:
The lead incorporates pre-formed anchoring features and transition zones during manufacturing that are designed to engage with tissue or bone at specific locations. These preliminary structural features ensure that when the lead is implanted, the flexible portions can move with the body while the pre-positioned rigid zones provide immediate migration resistance.
4Reliability
If anchors are placed at multiple locations along the lead, then the migration resistance improves, but the implantation procedure becomes more complex
Solution Approach 1:
The lead is pre-segmented into multiple anchoring zones with varying stiffness along its length, creating a distributed anchoring system. This segmentation provides migration resistance at multiple locations while the modular design allows for simplified implantation, as the anchoring features are already integrated into the lead structure rather than requiring separate anchor implantation steps.
Solution Approach 2:
The lead structure serves multiple functions simultaneously: the flexible portions accommodate body motions, the transition zones distribute mechanical stresses, and the rigid anchoring portions prevent migration. This multi-functionality is achieved through a single integrated lead design, avoiding the need for separate anchoring devices and simplifying the overall implantation procedure while maintaining high migration resistance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The slack anchor significantly reduces the risk of migration, maintaining effective stimulation and agent delivery by absorbing movement and minimizing translation, thus enhancing treatment efficacy and patient comfort.
Implementation Method 1
providing friction and resistance to migration
Data Source
AI summary
Devices, systems and methods for reducing migration of leads, catheters and similar devices are provided. In particular, devices, systems and methods are provided for creating a slack anchor which assists in maintaining the lead or catheter in a desired position. In some embodiments, the slack anchor is created within the epidural space. When targeting nerve anatomy within the spinal column or in the vicinity of the epidural space, anchoring within the epidural space allows the associated lead or catheter to be anchored as close to the target therapy site as desired or possible. By anchoring close to the target therapy site, the risk of movement or migration is significantly reduced or eliminated.