Medical Device Asperities for Tissue Integration
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Solution Overview
Problem
Conventional medical devices, such as vascular grafts and stent grafts, face challenges in promoting cell proliferation and ingrowth, leading to poor hemocompatibility and increased risk of occlusion, due to their inert surfaces that fail to integrate effectively with native tissue.
Innovation Solution
A method involving an apparatus with asperities that injures native tissue at desired anchoring locations to initiate an injury response, promoting cell proliferation and ingrowth, which includes using inflatable or self-expandable devices like balloons or stents with extracellular matrix materials like small intestine submucosa to enhance tissue integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If highly polished implantable medical device surfaces are used to ensure hemocompatibility, then device inertness and immune system compatibility are improved, but cell proliferation and ingrowth around the device deteriorate
Solution Approach 1:
The device surface is designed with locally differentiated properties: highly polished regions provide hemocompatibility and inertness, while roughened regions with asperities promote cell proliferation and ingrowth. This local quality variation allows the device to simultaneously achieve both hemocompatibility and effective cell integration at different locations on the same device surface.
Solution Approach 2:
The device surface is segmented into distinct functional zones: smooth hemocompatible regions and roughened cell-proliferation regions. This segmentation allows independent optimization of each region's properties, enabling the device to fulfill multiple conflicting requirements through spatial differentiation of surface characteristics.
2Productivity
If ECM protein coatings are applied to promote cell adhesion and integration, then cell proliferation and ingrowth are improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The roughened surface with asperities creates a passive physical structure that naturally promotes cell adhesion and proliferation through increased surface area and mechanical interlocking, eliminating the need for active ECM protein coatings. The surface morphology itself provides the biological functionality, simplifying the device design and manufacturing process.
Solution Approach 2:
The mechanical roughening process using asperities provides a cost-effective alternative to expensive ECM protein coatings. The asperities are permanently integrated into the device structure during manufacturing, eliminating ongoing costs associated with protein coating application and regulatory approval processes.
3Productivity
If tissue injury is induced to initiate injury response and promote cell proliferation, then cell ingrowth and tissue integration are improved, but device complexity and procedure complexity increase
Solution Approach 1:
The asperities are integrated directly into the device structure, merging the tissue injury function with the anchoring function. The same structural features that provide mechanical support and anchoring also create controlled tissue injury to initiate the healing response, eliminating the need for separate injury-inducing apparatus.
Solution Approach 2:
The asperities are pre-formed on the device surface during manufacturing, so that when the device is implanted, the tissue injury and cell proliferation promotion occur automatically as part of the implantation process itself, without requiring additional procedural steps or separate apparatus.
Data Source
AI summary
The present invention relates to methods of treating tissue of the human body, specially, methods of promoting cell proliferation and ingrowth around implantable medical devices. The methods include inserting an apparatus comprising asperities adapted to injure native tissue at a desired anchoring location, injuring the native tissue at the desired anchoring location with the apparatus to initiate an injury response in the native tissue to thereby promote cell proliferation and ingrowth; and implanting the medical device at the treatment location.