Biodegradable and Tissue-Growth Fixation for Implantable Devices
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Solution Overview
Problem
Current fixation devices for implantable medical devices, such as pacemakers and sensors, pose safety hazards due to their permanent nature, potential for erosion, thrombogenicity, and incompatibility with procedures like MRI, and require anti-thrombotic therapy, necessitating a solution for secure and safe anchoring within the body.
Innovation Solution
A dual fixation mechanism comprising a temporary biodegradable component to anchor the device initially and a chronic tissue growth-promoting component to ensure long-term anchoring, reducing the need for large stents and minimizing adverse effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a permanent fixation mechanism is used to anchor the IMD, then long-term securing is achieved, but safety hazards increase due to erosion, thrombogenicity, and incompatibility with MRI procedures
Solution Approach 1:
The fixation mechanism is divided into two distinct segments: a temporary fixation mechanism that provides initial anchoring and a chronic fixation mechanism that promotes long-term tissue integration. This segmentation allows each component to be optimized for its specific function, with the temporary mechanism being removable after serving its purpose, thereby eliminating long-term safety hazards while maintaining reliable initial securing.
Solution Approach 2:
The temporary fixation mechanism is designed as a disposable component that serves its anchoring function for a limited period post-implantation and is then removed. This disposable approach eliminates the long-term safety hazards associated with permanent fixation mechanisms (erosion, thrombogenicity, MRI incompatibility) while providing sufficient reliable securing during the critical initial period until tissue integration occurs.
2Strength
If a large fixation mechanism is used to ensure secure anchoring, then anchoring strength is improved, but the device footprint increases causing adverse effects on surrounding anatomy
Solution Approach 1:
The fixation system is segmented into temporary and chronic components, each with optimized dimensions for their specific function. The temporary fixation mechanism can be smaller and less invasive since it only needs to provide short-term anchoring, while the chronic mechanism leverages biological tissue growth to provide long-term securing without requiring a large initial footprint, thereby reducing adverse effects on surrounding anatomy.
Solution Approach 2:
The anchoring mechanism transitions from a mechanical parameter-based system (where anchoring strength depends on the size and structure of the fixation device) to a biological parameter-based system (where anchoring strength develops over time through tissue growth and integration). This parameter change allows for a smaller initial device footprint while achieving sufficient anchoring strength through the body's own tissue proliferation.
3Reliability
If a permanent fixation mechanism is used, then long-term anchoring is maintained, but anti-thrombotic therapy is required increasing treatment complexity
Solution Approach 1:
The temporary fixation mechanism is extracted from the long-term system, serving only its initial anchoring function before being removed. This extraction eliminates the need for permanent foreign materials that would require anti-thrombotic therapy, thereby reducing treatment complexity while maintaining reliable long-term anchoring through the chronic fixation mechanism that promotes natural tissue integration.
Solution Approach 2:
The temporary fixation mechanism is designed as a short-living component that is removed after serving its initial anchoring purpose. By eliminating permanent fixation materials, the need for ongoing anti-thrombotic therapy is removed, significantly reducing treatment complexity while the chronic fixation mechanism ensures reliable long-term anchoring through biological integration.
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 approach enhances safety, reduces the risk of complications, and promotes a more reliable and less invasive chronic fixation, eliminating the need for large fixation mechanisms that can cause adverse effects over time.
Implementation Method 1
The temporary fixation mechanism includes a biodegradable material and is configured to anchor the IMD within a blood vessel of a patient after implantation until the temporary fixation mechanism biodegrades
Implementation Method 2
The chronic fixation mechanism is configured to promote tissue growth that anchors the IMD within the blood vessel before the temporary fixation mechanism biodegrades
Data Source
AI summary
A fixation device configured to anchor an implantable medical device within a patient includes a temporary biodegradable fixation mechanism configured to secure the device after implantation until the temporary fixation mechanism biodegrades and a chronic fixation mechanism configured to promote tissue growth that secures the device to tissue of the patient before the temporary fixation mechanism biodegrades.