Ventricular Assist Implant Surface for Tissue Ingrowth Stability
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Solution Overview
Problem
Existing cardiac support devices face challenges in biocompatibility and stability due to immune responses and tissue integration issues, leading to potential rejection and impaired heart function.
Innovation Solution
A cardiac support device with a shell featuring a textured surface, either porous or rough, designed to promote the ingrowth of connective tissue, which enhances biocompatibility and stability by preventing macrophage recognition and promoting tissue encapsulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a smooth shell surface is used, then the device structure is simple and easy to manufacture, but tissue integration is poor and immune responses occur
Solution Approach 1:
The shell surface is designed with a porous structure having pore sizes between 1 μm to 1000 μm (particularly 10 μm to 500 μm, preferably 40 μm to 300 μm). This porous texture promotes tissue ingrowth by allowing connective tissue to penetrate and integrate with the implant surface, thereby improving tissue integration and biocompatibility while maintaining manufacturing feasibility through techniques like foam formation, sintering, or surface coating with porous materials.
Solution Approach 2:
The shell surface is modified locally by applying a porous or rough coating to specific regions, or by creating localized surface structures through surface modification techniques. This allows different regions of the shell to have different surface properties, with textured areas promoting tissue integration where needed while maintaining the overall structural integrity and manufacturability of the device.
2Reliability
If a porous or rough surface is applied to promote tissue ingrowth, then biocompatibility improves, but the manufacturing process becomes more complex
Solution Approach 1:
The shell is manufactured with an integrated porous structure from the beginning using techniques such as foam formation, sintering of particulate materials, or 3D printing with porous infill. This approach creates the tissue-promoting porous surface as part of the base material structure, avoiding the need for separate coating or modification steps, thereby maintaining ease of manufacture while achieving improved biocompatibility.
Solution Approach 2:
The shell is constructed from composite materials that inherently possess porous or textured surface characteristics. For example, using sintered metal powders, foam plastics, or composite structures with embedded porous layers. This integrates the surface texture functionality into the material selection itself, simplifying the overall manufacturing process while ensuring reliable tissue integration and biocompatibility.
3Ease of manufacture
If the shell surface is made smooth, then manufacturing is easier, but macrophage recognition increases leading to immune rejection
Solution Approach 1:
The shell surface is designed with a porous texture that prevents macrophage recognition and phagocytosis. The porous structure with pore sizes of 1 μm to 1000 μm creates a surface topology that interferes with macrophage attachment and recognition mechanisms, thereby reducing immune responses and preventing implant rejection while remaining manufacturable through standard porous material fabrication techniques.
Solution Approach 2:
The invention converts the potential harm of a smooth surface (which facilitates macrophage recognition and immune rejection) into a benefit by deliberately introducing a porous or rough texture. This texture, while adding manufacturing complexity, actually protects the implant by preventing macrophage recognition and promoting beneficial tissue integration, thereby turning a manufacturing challenge into an immune-protection solution.
4Reliability
If a textured surface is used to promote tissue encapsulation, then implant stability improves, but the device complexity increases
Solution Approach 1:
The shell incorporates a porous surface structure with controlled pore sizes (1 μm to 1000 μm, particularly 10 μm to 500 μm) that promotes tissue encapsulation and implant stability. The porous texture is integrated into the shell's base structure through manufacturing techniques like foam formation or sintering, avoiding the need for separate complex coating processes, thereby achieving improved stability while limiting device complexity.
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 textured surface facilitates successful tissue integration, improving the device's mechanical support and reducing immune reactions, ensuring optimal heart function and implant stability.
Implementation Method 1
The inner and outer surfaces of the shell have a textured surface that promotes the ingrowth of connective tissue. The texture that promotes tissue ingrowth can be porous and/or rough.
Implementation Method 2
The surface of the covering can be porous. The surface of the covering can include pores, the pores having a size of 1 μm to 1000 μm, particularly 10 μm to 500 μm.
Implementation Method 3
The surface of the casing can include a rough surface. The rough surface can have a roughness of 1 μm to 1000 μm, in particular 10 μm to 500 μm.
Data Source
Figure 1
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Figure 4a~4b
AI summary
The present invention relates to a ventricular assist device. Said ventricular assist device comprises an implant having a covering, said covering having a structured surface which promotes tissue ingrowth.