Cranial Lead Fixation With Tool-Responsive Radial Compression

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Solution Overview

Problem

Existing lead fixation devices struggle to securely maintain the distal end of brain leads at the desired target location during and after implantation, particularly due to the flexible nature of the leads and the removal of stiffening elements like stylets and cannulas, leading to unintended displacement.

Innovation Solution

A lead fixation device with a skull attachment member and a flexible compression mechanism that transitions diameter upon tool insertion and removal, securing the lead in place through radial compression and expansion, preventing displacement during the implant procedure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the lead is made flexible to allow coiling and folding at the skull surface, then the lead can accommodate excess length and minimize tissue damage, but the lead becomes prone to displacement from the target location

Engineering Contradiction:

Improvelead flexibilityVSAvoidlead positioning stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The fixation device is installed on the lead before the stylet is removed, preemptively securing the lead in place. This preliminary action prevents the lead from displacing when the stylet is withdrawn, resolving the contradiction between maintaining lead flexibility and ensuring positioning stability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The fixation device acts as an intermediary element between the lead and the skull. It provides a stable anchoring point that counteracts the lead's natural tendency to move when flexible, allowing the lead to remain both flexible and securely positioned.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the lead is made stiff to maintain positioning during implantation, then the lead can be accurately placed at the target, but the lead cannot be coiled or folded at the skull surface

Engineering Contradiction:

Improvelead positioning accuracyVSAvoidlead flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The lead system is segmented into two parts: the implantation phase where stiffness is needed for accurate placement, and the post-implantation phase where flexibility is needed for coiling. The fixation device enables this segmentation by providing temporary rigidity during insertion, then allowing flexibility afterward.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The lead's mechanical properties are made dynamic rather than static. The lead transitions from a stiff state during implantation to a flexible state after fixation, allowing it to adapt to different functional requirements at different stages of the procedure.

Inventive Principle:

Principle #15Dynamics

3Ease of operation

If stylets and cannulas are removed after lead placement, then the implantation procedure can be completed, but the lead may be inadvertently displaced during subsequent steps

Engineering Contradiction:

Improveprocedure completionVSAvoidlead positioning stability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The fixation device is installed before the stylet and cannula are removed, creating a preliminary secure attachment that prevents displacement during the subsequent removal steps and other procedural operations.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The fixation device applies a preliminary counteracting force to prevent the harmful effect of lead displacement. By securing the lead in place before displacement can occur, it neutralizes the potential harm from subsequent manipulation during procedure completion.

Inventive Principle:

Principle #9Preliminary anti-action

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 device effectively secures the lead in place, reducing the likelihood of displacement from the target, even after removal of the stiffening elements, ensuring precise positioning and stability of the lead.

Implementation Method 1

The lead compression mechanism is configured to transition the diameter from a first size to a second size greater than the first size upon insertion of an implant tool through the passageway, and from the second size to the first size upon removal of the implant tool from the passageway

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Implementation Method 2

Methodology Applied

Scientific EffectRadial compression: Compression

Data Source

PatentUS12403303B2Lead fixation devices for securing a lead to a cranium

Publication Date: 2025.09.02 NEUROPACE INC

AI summary

A lead fixation device for securing a first portion of a lead relative to a hole formed through a skull includes a skull attachment member having an upper surface and a lower surface and a bore extending through and between the upper surface and the lower surface. The lead fixation device also includes a lead compression mechanism integral with the skull attachment member and aligned with the bore of the skull attachment member. The lead compression mechanism defines a passageway through the lead fixation device, which passageway is characterized by a diameter that is defined by the lead compression mechanism. The lead compression mechanism is configured to transition the diameter from a first size to a second size greater than the first size upon insertion of an implant tool through the passageway, and from the second size to the first size upon removal of the implant tool from the passageway.