Implantable Interface Device Tissue Integration Layer
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Solution Overview
Problem
Implantable devices that breach the skin often fail due to inadequate skin attachment, leading to epidermal marsupialisation, avulsion, and infection, which complicates their longevity and effectiveness for vascular and body cavity access.
Innovation Solution
An interface device with a macroporous tissue integration layer and a crowning element designed for epidermal attachment, utilizing negative pressure to enhance tissue integration, and potentially including functionalized zones for improved attachment and resistance to marsupialisation, formed from biocompatible materials that can be flexible and biodegradable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If implantable devices breach the skin to access vascular and body cavities, then access to body cavities is achieved, but skin attachment fails leading to epidermal marsupialisation, avulsion, and infection
Solution Approach 1:
The device is divided into distinct functional zones: a crowning element for epidermal attachment, a tissue integration layer for dermal anchoring, and an access port for body cavity access. This segmentation allows each zone to perform its specific function optimally without compromising the others.
Solution Approach 2:
Different regions of the device have different properties tailored to their function: the crowning element has epidermal-attachment-promoting surface characteristics, the tissue integration layer has porous macroporous structure for tissue ingrowth, and the access port provides controlled access. This local differentiation resolves the contradiction by optimizing each region for its specific role.
2Duration of action of stationary object
If porosity is increased in skin-implanted devices to enhance tissue integration, then implantation longevity is improved, but dead spaces and non-connected pores increase which can lead to infection
Solution Approach 1:
The tissue integration layer uses macroporous material with controlled pore architecture that promotes tissue ingrowth while minimizing dead spaces. The porosity is optimized to allow tissue penetration and integration, enhancing longevity without creating infection-prone cavities.
Solution Approach 2:
The pore size, distribution, and connectivity parameters of the tissue integration layer are specifically controlled to achieve optimal tissue integration. The macroporous structure has interconnected pores that facilitate tissue ingrowth while avoiding isolated dead spaces where infection could develop.
3Strength
If a robust design is used to prevent avulsion and enhance structural integrity, then device stability is improved, but skin attachment failure and epidermal marsupialisation occur
Solution Approach 1:
The device separates the functions of epidermal attachment (crowning element) and structural stability (tissue integration layer). The crowning element is designed specifically for skin attachment with appropriate surface properties, while the tissue integration layer provides robust anchoring through tissue ingrowth into its macroporous structure.
Solution Approach 2:
The device combines different materials with complementary properties: the crowning element uses materials optimized for epidermal attachment, while the tissue integration layer uses macroporous biocompatible materials that promote tissue ingrowth and provide structural stability. This composite approach resolves the contradiction between attachment and stability.
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 device achieves a stable, infection-free interface that allows for long-term vascular and body cavity access, reducing avulsion forces and enhancing tissue integration, thereby improving the longevity and effectiveness of implantable devices.
Implementation Method 1
a tissue integration layer having a porous structure adapted for ingress of tissue to anchor the device when implanted; wherein the porous structure of the tissue integration layer is interconnected for tissue ingress during implantation
Implementation Method 2
Tissue integration into the porous structure of the tissue integration layer may be enhanced by application of a negative pressure to the device during implantation
Data Source
AI summary
An interface device for implantation in a subject includes a tissue integration layer and a crowning element. The tissue integration layer has a porous structure adapted for ingress of tissue to anchor the device when implanted. The crowning element is adapted for epidermal attachment when the device is implanted and is configured such that once implanted, part of the crowning element extends through the epidermis and is accessible from outside the subject's body. The porous structure of the tissue integration layer is interconnected for tissue ingress during implantation.