Hollow Polymer Pellet Scaffold for Tissue Repair
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Solution Overview
Problem
Current scaffolds for tissue and bone repair face challenges such as poor vascularization, integration, and remodelling, leading to structural failures and inflammatory responses, while existing delivery systems struggle with porosity, strength, and controlled release of agents, especially in hard-to-reach or irregularly shaped tissue sites.
Innovation Solution
The development of hollow polymer pellets that interlink to form a solid scaffold with high porosity and compressive strength, allowing for controlled release of agents and improved cell loading, with the ability to set at different times and temperatures, enabling minimally invasive administration and tailored porosity for specific tissue types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If pre-formed water-insoluble matrices are used for scaffold implantation, then the scaffold can provide structural support, but the implantation requires invasive surgery and the scaffold must be precisely shaped to fit the cavity
Solution Approach 1:
The scaffold material undergoes a parameter change from solid pellets at room temperature to a molten state at body temperature (above glass transition temperature), enabling it to flow into the cavity and then solidify, eliminating the need for precise pre-shaping and reducing surgical invasiveness
Solution Approach 2:
The scaffold material transitions from a static solid form during storage to a dynamic flowable state during implantation, and then back to a static solid form after setting, allowing it to adapt to the cavity shape without requiring invasive shaping procedures
2Ease of operation
If hydrogels are used for scaffold delivery, then the scaffold can be delivered through a syringe without invasive surgery, but the hydrogel lacks large interconnected porous networks and has poor mechanical strength
Solution Approach 1:
The scaffold is formed from hollow polymer pellets that maintain their hollow structure during interlinking, creating large interconnected porous networks within the solidified scaffold that enable agent diffusion and cell infiltration while providing mechanical strength
Solution Approach 2:
The scaffold combines the flowable delivery properties of hydrogels with the mechanical strength and porosity of solid polymer structures by using interlinked hollow polymer pellets that solidify in situ, creating a composite structure with both delivery and structural capabilities
3Strength
If solid polymer pellets are used to form scaffold, then the scaffold can provide mechanical strength, but the pellets must be delivered in a flowable state requiring temperature control
Solution Approach 1:
The delivery system utilizes the glass transition temperature parameter change of the polymer pellets, storing them as solids at room temperature and transforming them to a molten flowable state at body temperature for injection, then allowing them to solidify again after implantation
Solution Approach 2:
The polymer pellets self-regulate their flowability through temperature change - they are flowable at body temperature during implantation and automatically solidify after cooling, eliminating the need for complex external temperature control mechanisms during delivery
4Quantity of substance
If scaffolds are designed with high porosity for agent release, then the agent diffusion is improved, but the mechanical strength and structural integrity are reduced
Solution Approach 1:
The hollow polymer pellets create inherent large pores within the scaffold structure that facilitate agent diffusion and cell infiltration while the interlinking of pellets provides the structural framework that maintains mechanical integrity despite the high porosity
Solution Approach 2:
The hollow structure of the pellets adds a three-dimensional porous architecture to the scaffold, creating channels for agent release in the internal dimension while the external pellet structure maintains the overall structural integrity
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 hollow polymer pellet scaffolds provide a high surface area for cell growth, controlled agent release, and enhanced mechanical strength, facilitating effective tissue repair and regeneration, particularly in challenging anatomical locations, while preventing degradation product buildup and maintaining cell viability under shear forces.
Implementation Method 1
The plurality of hollow polymer pellets are capable of interlinking and setting into a solid scaffold
Data Source
AI summary
The invention relates to a scaffold material composition for forming a solid tissue scaffold, the composition comprising a plurality of hollow polymer pellets, each pellet comprising an open hollow extending through the pellet, and wherein the plurality of hollow polymer pellets are capable of interlinking and setting into a solid scaffold. The invention further relates to associated compositions, uses, method of treatment and kits associated with such material.