Tissue Transfer Device with Sacrificial Layer
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Solution Overview
Problem
In tissue engineering, bioprinted tissues are fragile during the initial maturation phase, making it challenging to transfer them without disrupting their structural integrity, especially when moving from one medium to another.
Innovation Solution
A transfer system that captures a sacrificial layer external to the tissue structure, allowing for controlled movement by a plunger and needle mechanism, which applies shear stresses to the sacrificial layer while minimizing compressive strain on the tissue, enabling the tissue to be transferred intact between media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the tissue structure is transferred directly without a sacrificial layer, then the transfer process is simpler, but the tissue structure is disrupted and structural integrity is lost
Solution Approach 1:
A sacrificial layer is introduced as an intermediary substance between the tissue structure and the transfer medium. This layer is deposited around the tissue, providing mechanical support during transfer operations. The sacrificial layer acts as a temporary scaffold that maintains tissue integrity during manipulation and can be removed after the transfer is complete, thus resolving the contradiction between transfer simplicity and tissue structural stability.
2Ease of operation
If shear stresses are applied to the tissue structure during transfer, then the transfer process is easier to control, but the tissue structure is damaged
Solution Approach 1:
The sacrificial layer serves as a mediator that absorbs and distributes shear stresses during the transfer process. Instead of applying shear forces directly to the fragile tissue structure, the sacrificial layer is manipulated, which indirectly moves the tissue while protecting it from damaging stresses. This resolves the contradiction by enabling operational control without directly compromising tissue strength.
Solution Approach 2:
The sacrificial layer functions as a flexible protective shell around the tissue structure. This thin film-like layer can deform and adapt to transfer operations while maintaining the structural integrity of the enclosed tissue. The flexible nature of the sacrificial layer allows for controlled manipulation without transmitting damaging forces to the tissue, thus resolving the contradiction between ease of operation and tissue strength preservation.
3Speed
If compressive or tensile stress is applied to the tissue structure, then the tissue can be moved, but the structural integrity is compromised
Solution Approach 1:
The sacrificial layer acts as a stress-distributing intermediary that enables the application of compressive or tensile forces during tissue transfer. By manipulating the sacrificial layer rather than the tissue directly, forces can be applied more gently and distributed across a larger area, reducing peak stresses on the tissue structure. This allows for controlled transfer at appropriate speeds while maintaining tissue integrity, resolving the contradiction between transfer speed and structural stability.
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
Preserves the structural integrity of the tissue during transfer by distributing shear forces on the sacrificial layer, allowing for successful relocation of the tissue from one medium to another without compromising its integrity.
Implementation Method 1
The tolerance for small amounts of compressive or tensile stress can be employed in the extraction process by capturing the sacrificial layer of the medium external to the structure. By doing so, the sacrificial layer may be subject to shear stresses, while the structure may experience a relatively small amount of transferred compressive strain.
Data Source
AI summary
A transfer device designed to extract an amorphous or semi-solid structure, tissue, or construct from supporting media while maintaining the spatial integrity/organizational architecture thereof. The transfer device can include a controller, an actuator assembly, a plunger, and a needle. The controller can move the transfer device and the plunger independently.