Curved Spinal Cord Stimulation Paddle Lead Fixation
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Solution Overview
Problem
Current neurostimulation leads face challenges in energy efficiency and lead migration due to geometric constraints of the human anatomy, with percutaneous leads inefficiently broadcasting energy and lacking fixation, while traditional paddle leads are prone to rotation and CSF increase, reducing electrical efficiency.
Innovation Solution
A double curved flexible paddle assembly design with biocompatible polymer paddles, where one side compresses against the spinal column for fixation and the other side with embedded electrodes conforms to the dura mater, restricting CSF flow and improving directional control of electrical signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a percutaneous lead is used with a small cylindrical diameter and long slender length, then implantation with minimal tissue trauma is achieved, but energy efficiency deteriorates due to indiscriminate radial broadcasting of electrical energy all around the circumference
Solution Approach 1:
The paddle lead employs a curved surface instead of a flat planar surface, allowing the lead to conform to the curved anatomy of the spinal column. This curvature enables the lead to focus electrical energy more effectively on the targeted neurological tissue while maintaining ease of implantation through the curved configuration that naturally adapts to the spinal anatomy.
Solution Approach 2:
The lead design transitions from uniform radial broadcasting to localized energy emission. By configuring the paddle with electrodes on one side only and using a curved surface, the electrical energy is directed locally toward the spinal cord rather than being distributed uniformly in all directions, thereby improving energy efficiency while maintaining implantation ease.
2Loss of energy
If a traditional paddle lead with flat planar surfaces is used, then energy efficiency is improved compared to percutaneous leads, but adaptability deteriorates because the flat surfaces do not conform to curved surfaces of the spinal column
Solution Approach 1:
The paddle lead replaces flat planar surfaces with a curved surface that matches the curvature of the spinal column. This curved configuration allows the lead to conform to the anatomical shape, improving both energy efficiency through focused electrical emission and adaptability through natural anatomical alignment.
Solution Approach 2:
The lead design uses asymmetric electrode placement on one side of the curved paddle surface rather than symmetric placement on both sides. This asymmetric configuration, combined with the curved geometry, enables the lead to conform to the curved spinal anatomy while directing electrical energy efficiently toward the targeted tissue.
3Ease of manufacture
If a paddle lead without a fixation mechanism is used, then ease of manufacture is improved, but reliability deteriorates due to lead migration and rotation within the body
Solution Approach 1:
The curved surface of the paddle lead provides inherent mechanical interlocking with the curved anatomy of the spinal column. This curvature-based mechanical fit creates natural resistance to rotation and migration without requiring additional fixation components, thereby maintaining manufacturing simplicity while improving lead stability and reliability.
Data Source
AI summary
An improved electrical neurological stimulation paddle lead is described. The paddle lead comprises two flexible concave paddle bodies that are joined together at their opposing convex surfaces. The first paddle body contains a series of electrodes that are embedded on the concave surface that expand to fit the contours of the dura mater. The second paddle body consists of a concave surface that is pressed against the bone of the spinal column to act as a fixation mechanism to keep the paddle assembly in place.