Conformable Medical Device Cover With Tissue-Integrating Fixation
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Solution Overview
Problem
Biologically inert materials used in implantable medical devices often cause the formation of thick fibrous capsules, leading to implant loosening and clinical failure, especially in soft tissues where mechanical fixation is limited.
Innovation Solution
A biocompatible attachment means with a biocompatible scaffold that encourages tissue infiltration and vascularization, forming a stable mechanical interlock through cellular-scaffold bio-adhesion, and gradually resorbs to be replaced by host tissue, reducing fibrous capsule formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If biologically inert materials are used in implantable medical devices, then biocompatibility is improved, but thick fibrous capsule formation occurs leading to implant loosening
Solution Approach 1:
The patent employs a porous biocompatible scaffold as the implantable medical device. The porous structure allows host tissue infiltration and vascularization into the device, creating a strong mechanical interlock that prevents implant loosening while maintaining biocompatibility. The porosity enables cellular penetration and tissue integration, directly addressing the fibrous capsule formation problem by allowing tissue to grow within the device structure rather than forming a capsule around it.
Solution Approach 2:
The patent utilizes composite materials combining biocompatible polymers with porous scaffold structures. This composite approach integrates the biocompatibility of inert materials with the mechanical fixation capabilities of porous structures, creating a device that both resists fibrous capsule formation and provides strong anchoring to host tissue.
2Strength
If mechanical fixation is used in soft tissue implants, then initial stability is improved, but tissue rejection and fibrous capsule formation increase
Solution Approach 1:
The porous scaffold structure provides mechanical fixation through tissue infiltration rather than external mechanical anchoring. The pores allow host tissue to grow into the device, creating internal mechanical interlocks that provide stability without requiring aggressive fixation methods that would trigger inflammatory responses and fibrous capsule formation.
Solution Approach 2:
The porous scaffold acts as an intermediary between the implantable device and host tissue. It facilitates gradual tissue integration and vascularization, mediating the interface between the foreign device and biological tissue in a way that minimizes inflammatory response while establishing strong mechanical fixation over time.
3Reliability
If fibrous capsule forms around implant, then biological encapsulation is improved, but implant loosening and clinical failure occur
Solution Approach 1:
The porous structure fundamentally changes the biological response from capsule formation to tissue infiltration. Instead of forming a dense fibrous capsule that isolates and loosens the implant, the porous scaffold allows tissue to penetrate and integrate within the device structure, providing stable long-term anchoring while maintaining biological encapsulation through tissue integration rather than fibrous isolation.
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
Enhances long-term clinical success by minimizing inflammatory response and fibrous capsule formation, providing a strong, stable mechanical implant-tissue fixation.
Implementation Method 1
each of the biocompatible filaments comprising a shape-memory material and configured to transform from an extended configuration to a reduced configuration when the cover is heated to a predetermined temperature
Implementation Method 2
encourages the soft tissue cells to infiltrate into the biocompatible scaffold and for vascularisation to occur within the biocompatible scaffold. Once the cells and vasculature have sufficiently infiltrated into the biocompatible scaffold, a cellular-scaffold bio-adhesion and mechanical interlock is achieved
Implementation Method 3
as the biocompatible scaffold gradually resorbs within the in vivo environment, the infiltrated soft tissue grows to replace the biocompatible scaffold
Data Source
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AI summary
An attachment device for connecting a medical device to biological tissue of a subjecf includes a biocompatible scaffold including photoactive crosslinking agent and a photoactive dye to facilitate crosslinking of the scaffold with biological tissue of a subject when light is directed onto the scaffold. A conformable cover for a medical device made from the biocompatible scaffold includes strain crystallised, filaments which change shape at a predetermined temperature to conform the cover to an outer shape of the medical device. The conformable cover can be attached to biological tissue.