Freeze-Dried Chitosan Implants for Tissue Repair
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Solution Overview
Problem
Current methods fail to provide stable, physiological, and active freeze-dried chitosan formulations that can be reconstituted in platelet-rich plasma (PRP) to form viable, non-retracting in situ gelling implants for tissue repair and therapeutic intra-articular injections, lacking mechanical stability and proper physiological properties.
Innovation Solution
Development of a freeze-dried polymer composition comprising chitosan with lyoprotectants and a clot activator, designed to reconstitute quickly and completely in PRP or blood, forming homogenous, mechanically stable, and viscous implants that inhibit clot retraction and maintain physiological properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If freeze-dried chitosan formulations are prepared without proper lyoprotectants and clot activators, then the formulation process is simpler, but the formulations lack mechanical stability and physiological properties upon reconstitution
Solution Approach 1:
The patent applies preliminary action by incorporating lyoprotectants and clot activators into the freeze-dried formulation before storage. The lyoprotectants are pre-added to protect chitosan structure during freeze-drying and ensure proper reconstitution, while clot activators are pre-incorporated to enable immediate clot formation upon contact with PRP or blood, eliminating the need for separate addition steps at the time of use.
Solution Approach 2:
The patent uses composite materials by combining chitosan with specific lyoprotectants (such as sugars, polyols, or amino acids) and clot activators (such as calcium salts or thrombin) in defined ratios. This composite formulation ensures both mechanical stability during storage and proper physiological function upon reconstitution, resolving the contradiction between formulation simplicity and reliability.
2Loss of time
If freeze-dried chitosan formulations are designed for rapid reconstitution, then the reconstitution time is reduced, but the mechanical stability and homogeneity of the resulting implant may be compromised
Solution Approach 1:
The patent applies porous materials by creating a highly porous freeze-dried cake structure through optimized freeze-drying parameters. This porous structure provides extensive surface area and interconnected channels that allow rapid water absorption and uniform distribution throughout the formulation, enabling quick reconstitution without compromising homogeneity. The porous structure also maintains mechanical integrity during the rapid reconstitution process.
3Stability of the object's composition
If the freeze-dried formulation contains high concentrations of lyoprotectants to ensure stability, then the storage stability is improved, but the physiological properties and viscosity of the reconstituted formulation may be affected
Solution Approach 1:
The patent applies parameter changes by carefully optimizing the concentration ranges of lyoprotectants and clot activators. The lyoprotectant concentrations are controlled within specific ranges (typically 1-10% w/v) to provide adequate protection during storage while ensuring that the reconstituted formulation maintains physiological viscosity and properties. The clot activator concentrations are similarly optimized to ensure rapid clot formation without causing excessive viscosity or deviating from physiological conditions.
4Volume of moving object
If the formulation is designed to inhibit clot retraction for tissue repair applications, then the implant volume is maintained, but the clot may become less mechanically stable
Solution Approach 1:
The patent applies local quality by creating a heterogeneous clot structure with different regional properties. The freeze-dried chitosan formulation creates localized regions that inhibit clot retraction through polymer-network formation and platelet activation, while maintaining overall clot stability through the distributed chitosan network. This local quality approach allows volume retention in critical regions while maintaining overall mechanical stability through the composite structure.
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 solution achieves rapid reconstitution, mechanical stability, and physiological compatibility, enabling effective tissue repair and intra-articular viscosupplementation without phase separation, ensuring optimal in vivo responses and prolonged implant residency.
Implementation Method 1
Freeze-dried scaffolds have been fabricated from pure chitosan
Implementation Method 2
designed to reconstitute quickly and completely in PRP or blood, forming homogenous, mechanically stable, and viscous implants that inhibit clot retraction
Implementation Method 3
forming homogenous, mechanically stable, and viscous implants that inhibit clot retraction
Data Source
AI summary
The present application relates to a freeze-dried polymer composition containing chitosan and at least one lyoprotectant, a process for preparing a freeze-dried composition containing chitosan and at least one lyoprotectant and the use of a reconstituted freeze-dried chitosan composition to prepare implants for tissue repair.