Shape-Memory Polymer Matrix for Minimally Invasive Tissue Regeneration
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Solution Overview
Problem
Current polymeric matrices for tissue regeneration and drug delivery face challenges in achieving a homogeneous and reproducible composition, particularly in difficult-to-reach body sites, and are invasive, with limitations in cell permanence and systemic toxicity.
Innovation Solution
Development of a cellularized polymeric matrix with a unique, homogeneous, and reproducible composition using a PLA-PCL copolymer or physical mixture, electrospun and sterilized, which can be implanted minimally invasively and induced to change shape with thermal stimuli for targeted therapy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymeric matrices are used for tissue regeneration and drug delivery, then therapeutic effectiveness is improved, but invasiveness of surgical operations increases and difficulty in reaching difficult-to-reach body sites worsens
Solution Approach 1:
The polymeric matrix is divided into two functional components: a shape-memory polymeric support providing mechanical properties and shape control, and a cellularized component containing cells and/or drugs. This segmentation allows the matrix to be implanted minimally invasively in a compact form and then activated to deliver therapeutic agents at the target site
Solution Approach 2:
The polymeric matrix is pre-programmed with shape-memory properties and pre-cellularized with cells and/or drugs before implantation. The shape-memory effect is activated after implantation through temperature change, causing the matrix to transition from a compressed implantable form to an expanded therapeutic form, thereby delivering the therapeutic payload at the target site without requiring invasive surgery
2Adaptability or versatility
If polymeric matrices are implanted in difficult-to-reach body sites, then targeted therapy is improved, but composition homogeneity and reproducibility worsen
Solution Approach 1:
The invention uses a copolymer composition with controlled ratios of L-lactide (60-80 mol%) and ε-caprolactone (20-40 mol%), along with controlled glass transition temperature (30-45°C), to achieve both targeted therapy capability and reproducible composition. The shape-memory effect is triggered by physiological temperature changes, ensuring consistent behavior across different implantation sites
3Reliability
If cells are used for evaluating biocompatibility, then biocompatibility assessment is improved, but cell permanence and therapeutic action duration worsen
Solution Approach 1:
The invention merges the evaluation function and therapeutic function into a single integrated system. The same cells that are used to evaluate biocompatibility during development are incorporated into the final therapeutic product, serving both as biocompatibility indicators and as permanent therapeutic agents that provide long-lasting action at the implantation site
4Reliability
If polymeric matrices are used for drug delivery, then therapeutic effectiveness is improved, but systemic toxicity worsens
Solution Approach 1:
The polymeric matrix is designed to deliver cells and/or drugs locally at the implantation site through its shape-memory effect. The matrix transitions from a compressed state during implantation to an expanded state at the target site, releasing the therapeutic payload locally rather than systemically, thereby maintaining therapeutic effectiveness while minimizing systemic toxicity
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 engineered shape-memory polymer matrix allows for easier implantation, reduced healing time, and controlled drug delivery, ensuring long-lasting cell positioning and minimizing systemic toxicity, while maintaining cellular viability and therapeutic effectiveness.
Implementation Method 1
polymeric matrices capable of temporarily modifying their shape, following the application of an external stimulus
Implementation Method 2
The subsequent unrolling of the matrix, induced by an external stimulus, preferably thermal and of a physiological entity
Implementation Method 3
electrospun matrices based on polylactate-co-trimethylene carbonate
Implementation Method 4
The subsequent increase in temperature to values of 37° C. led to the recovery of the original tubular shape
Data Source
AI summary
The present invention consists of a method for the production of a shape-memory tissue through the use of polymeric matrices capable of temporarily modifying their shape, following the application of an external stimulus, and at the same time capable of supporting the vehiculation of cells and/or drugs.