Nested Medical Device Anchoring Apparatus for Burr Hole Stability
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Solution Overview
Problem
Existing medical devices struggle to securely anchor elongate therapy delivery devices, such as electrical leads and catheters, within body portals like burr holes in the skull, which can lead to instability and ineffective therapy delivery for conditions like Parkinson's disease and dystonia.
Innovation Solution
An anchoring apparatus comprising a first part with an outer sidewall and opposing grip surfaces, and a second part with activation members that move the grip surfaces together to securely anchor the therapy delivery device, along with a base ring and cover to prevent rotation and ensure proper engagement with the body portal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing anchoring methods are used, then the device can be implanted, but the therapy delivery device becomes unstable and moves within the body portal
Solution Approach 1:
The anchoring apparatus is divided into multiple components: a base ring that anchors to the body portal, a lead anchor that secures the therapy delivery device, and a locking mechanism that connects them. This segmentation allows each component to perform its specific function optimally while maintaining overall stability without excessive complexity.
Solution Approach 2:
The base ring is first anchored to the body portal before the therapy delivery device is inserted. The grip surfaces are pre-positioned to engage the device, and the locking mechanism is prepared in advance to secure the assembly. This preliminary arrangement ensures stability is established before therapy delivery begins.
2Reliability
If the anchoring apparatus uses a larger profile to ensure secure anchoring, then stability improves, but the device size increases and may cause more tissue disruption
Solution Approach 1:
The lead anchor is nested within the base ring structure, and the therapy delivery device is nested within the lead anchor. This nested configuration allows multiple anchoring functions to be concentrated in a compact space, providing secure anchoring without a large overall profile that would increase tissue disruption.
Solution Approach 2:
The anchoring mechanism utilizes vertical stacking along the longitudinal axis rather than horizontal expansion. The base ring, lead anchor, and locking mechanism are arranged in layers, providing robust anchoring in the vertical dimension while maintaining a compact lateral profile that minimizes tissue disruption.
3Strength
If the grip surfaces are made larger to increase gripping force, then anchoring strength improves, but the device complexity and size increase
Solution Approach 1:
The grip surfaces feature localized high-friction zones and interlocking features concentrated at specific contact points with the therapy delivery device. Rather than uniformly increasing surface area, the design optimizes local properties (friction coefficient, geometric interlocking) at critical grip locations to maximize gripping force without adding overall device complexity.
Data Source
AI summary
Techniques, systems and apparatus for anchoring a therapy delivery device within a body portal are disclosed. An anchoring apparatus may comprise a first part comprising an outer sidewall and opposing grip surfaces. The outer sidewall may extend around a longitudinal axis of the apparatus to define an outer perimeter, at least a portion which may engage a surface of the body portal. A second part may comprise first and second activation members and a slot configured to receive the therapy delivery device. When the therapy delivery device is received in the slot and the second part is moved generally along the longitudinal axis, the first and second activation members may move the opposing grip surfaces toward one another to thereby anchor the therapy delivery device between the opposing grip surfaces.