MRI Compatible Lead Coil with Compressed Defibrillation Section
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Solution Overview
Problem
Implantable medical device leads experience peak tissue heating and voltage induction during MRI procedures due to RF energy absorption, posing safety risks to patients.
Innovation Solution
The design incorporates a lead with a coil section under longitudinal compression, maintained by couplings and cable conductor tension, which reduces peak MRI heating by ensuring circumferential contact between coil turns, allowing for efficient energy dissipation and minimizing heat concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the coil is under longitudinal compression to reduce peak MRI heating, then tissue heating is reduced, but the structural stability of the lead may be compromised
Solution Approach 1:
The coil is divided into multiple sections with different compression states. The proximal and distal sections are uncompressed to maintain structural stability, while the intermediate section is compressed to reduce MRI heating. This segmentation allows different parts of the coil to serve different functions simultaneously.
Solution Approach 2:
Different sections of the coil are given different mechanical properties through selective compression. The intermediate section is compressed to change its electrical characteristics for reducing heating, while the end sections remain uncompressed to maintain structural integrity and coil spacing.
2Object-affected harmful factors
If the coil section is compressed to disperse RF energy, then peak heating is reduced, but the electrical connection between coil turns may be affected
Solution Approach 1:
The coil is segmented into compressed and uncompressed regions. The compressed intermediate section disperses RF energy to reduce heating, while the uncompressed end sections maintain reliable electrical connections and proper coil spacing for stable performance.
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
This configuration significantly reduces peak heating along the coil, ensuring safer use of implantable medical devices during MRI procedures by dispersing induced RF energy effectively and preventing excessive tissue heating.
Implementation Method 1
Exposure to a magnetic field may also induce an undesired voltage on the lead
Implementation Method 2
This energy may be transferred through the lead to a conducting element in contact with the tissue, which may lead to elevated temperatures at the point of contact
Data Source
AI summary
Various embodiments concern leads having low peak MRI heating for improved MRI compatibility. Various leads include a lead body having at least one lumen, a proximal end configured to interface with an implantable medical device, and a distal end. Such leads can further include a conductor extending along at least a portion of the lead body within the at least one lumen and a defibrillation coil extending along an exterior portion of the lead body and in electrical connection with the conductor, wherein at least a section of the defibrillation coil is under longitudinal compression. The longitudinal compression can lower peak MRI heating along the defibrillation coil. The longitudinal compression may maintain circumferential contact between adjacent turns of the section of the defibrillation coil.