Cell Microsheet Injection via Stimulus-Responsive Polymer
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Solution Overview
Problem
Current treatments for locomotor disorders like osteoarthritis often require invasive surgical procedures for transplanting cartilage tissue, which can be burdensome for patients.
Innovation Solution
Development of a cell microsheet that can pass through thin injection needles, allowing for minimally invasive administration, formed from cultured cells, preferably derived from cartilage tissue or stem cells, and produced using stimulus-responsive polymers for detachment from cultureware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional cell sheet transplantation is used, then cartilage tissue can be transplanted effectively, but highly invasive surgical procedures with incision are required
Solution Approach 1:
The cell sheet is divided into multiple small cell microsheets, each with an area of 20 mm² or less, enabling them to pass through thin injection needles (18G or thinner) for minimally invasive administration while maintaining therapeutic effectiveness
Solution Approach 2:
The physical dimensions of the cell sheet are changed by reducing its area to 20 mm² or less, transforming it from a large sheet requiring surgical implantation to a small microsheet that can be injected through thin needles, thereby reducing invasiveness while preserving functionality
2Ease of operation
If cell sheets are made small enough to pass through thin needles, then minimally invasive treatment is enabled, but cell viability and therapeutic effectiveness may be compromised
Solution Approach 1:
A stimulus-responsive polymer is immobilized on the cultureware surface before cell cultivation, creating a controlled release mechanism that detaches cells as intact microsheets with preserved viability, preventing damage that would otherwise occur during mechanical manipulation
Solution Approach 2:
The stimulus-responsive polymer acts as an intermediary between the cultureware and cells, mediating the detachment process through stimulus response (such as temperature change) to release cells as intact microsheets without mechanical stress, thereby maintaining high cell viability
3Productivity
If cell sheets are cultivated and detached from cultureware, then transplantation is enabled, but conventional methods require complex surgical procedures
Solution Approach 1:
The cell microsheets are extracted from the cultureware as intact, ready-to-administer units through stimulus-responsive detachment, eliminating the need for complex surgical implantation procedures and enabling direct injection into the target site
Solution Approach 2:
The mechanical surgical implantation process is replaced by a chemical/stimulus-responsive detachment mechanism followed by simple injection, substituting complex mechanical surgical procedures with a simpler stimulus-driven release and injection system
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
Enables lowly invasive treatment for cartilage tissue repair with high cell viability, suitable for treating conditions such as arthritis and cartilage injuries, while maintaining therapeutic effectiveness comparable to conventional cell sheets.
Implementation Method 1
a stimulus-responsive polymer being immobilized on the surface of the cell cultureware
Data Source
AI summary
Cell microsheets are formed from a culture of cells. The cell microsheets has a size that can pass through an injection needle with a certain thickness. The cell microsheets can be produced on a surface of a cell cultureware. A stimulus-responsive polymer is immobilized on the surface having small divisions of the cell cultureware. The cell microsheets are suitable for minimally invasive treatment.