Carbon Nanotube Pacemaker Leads for Fibrosis and Strength
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Solution Overview
Problem
Pacemakers face challenges with excessive fibrotic tissue growth on electrode lines, making removal difficult, and conductor materials have low mechanical strength due to small diameters and metal or alloy composition.
Innovation Solution
The use of carbon nanotube wires and films in pacemaker leads, combined with a shielding layer containing radioactive particles, enhances mechanical strength and prevents fibrotic tissue growth by distributing these particles within the carbon nanotube structure, improving conductivity and ease of removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If metal or alloy conductors with small diameter are used in electrode lines, then the pacemaker can be miniaturized and implanted easily, but the mechanical strength of the electrode line becomes low
Solution Approach 1:
The patent uses carbon nanotube composite materials to replace traditional metal conductors. The carbon nanotube structure provides both high mechanical strength and electrical conductivity, allowing the electrode line to maintain strength while being miniaturized. The composite nature of carbon nanotubes (graphene cylinders) provides superior strength-to-weight ratio compared to metal alloys.
2Reliability
If traditional metal electrode lines are used, then conductivity is adequate, but excessive fibrotic tissue growth occurs on the electrode line making removal difficult
Solution Approach 1:
The patent changes the material parameter from metal to carbon nanotube, which fundamentally alters the surface properties and biocompatibility characteristics. Carbon nanotubes exhibit different electrochemical properties and surface characteristics that reduce fibrotic tissue adhesion, allowing the electrode to maintain conductivity while enabling easier removal after therapy.
3Strength
If carbon nanotube wires are used to increase mechanical strength, then the electrode line becomes tougher, but the manufacturing complexity increases
Solution Approach 1:
The patent replaces traditional mechanical metal conductor fabrication with a chemical/physical approach using carbon nanotube assembly. Instead of mechanically drawing and alloying metals, the process uses chemical vapor deposition or solution-based assembly of carbon nanotubes, which can be done at lower temperatures and with simpler equipment, reducing manufacturing complexity despite the advanced material.
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 carbon nanotube-based electrode lines exhibit increased toughness and conductivity, allowing for easier removal after therapy and improved pacemaker efficiency by reducing fibrotic tissue growth and enhancing mechanical strength.
Implementation Method 1
The first conductor (242) is a carbon nanotube wire
Implementation Method 2
a shielding layer (246) which is made of a carbon nanotube structure having a number of radioactive particles distributed in the interspaces of the carbon nanotube structure or filled in hollow structures of carbon nanotubes
Implementation Method 3
An electrical pulse signal can be generated by the pulse generator (10) and transported to an organ or a tissue by the electrode line (20)
Data Source
AI summary
A pacemaker is provided. The pacemaker includes a pulse generator and an electrode line connecting with the pulse generator. The electrode line includes a conductor, an insulation layer and a shielding layer. The insulation layer is located on an outer surface of the conductor. The shielding layer is located on an outer surface of the first insulation layer. The shielding layer is a carbon nanotube structure having a plurality of radioactive particles therein.