Laser Cell Printing on Ablated Intestinal Tissue Substrates
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Solution Overview
Problem
Conventional tissue engineering methods using intestinal tissue as a substrate for non-intestinal tissue-engineered transplants face challenges due to the absorptive and secretive nature of intestinal tissue, leading to compatibility issues.
Innovation Solution
A method and system utilizing laser ablation to remove unwanted layers from a receiver substrate and laser-induced forward transfer (LIFT) to deposit donor material, such as urothelial cells, onto the prepared substrate to create a transplantable tissue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If intestinal tissue is used as a substrate for non-intestinal tissue-engineered transplants, then the substrate is autologous and tolerated by the immune system, but the absorptive and secretive nature of intestinal tissue causes compatibility issues
Solution Approach 1:
The patent applies laser ablation to remove the epithelial layer from the intestinal tissue substrate, extracting the harmful absorptive and secretive components while preserving the underlying structural layer that provides immune tolerance. This selective removal eliminates the functional conflict between immune compatibility and tissue incompatibility.
Solution Approach 2:
The invention creates different functional zones within the substrate: the remaining structural layer maintains immune system tolerance, while the removed epithelial layer eliminates absorptive/secretive functions. Donor cells are then deposited only on the denuded areas, creating localized functional zones with appropriate properties for the target tissue.
2Manufacturing precision
If laser ablation is used to remove the epithelial layer, then the target layer is exposed for cell deposition, but the process requires precise control to avoid damage to underlying structures
Solution Approach 1:
The patent employs pulsed laser ablation rather than continuous irradiation. The periodic pulsing allows controlled removal of the epithelial layer with cooling intervals between pulses, preventing heat accumulation and damage to the underlying structural layer while achieving complete epithelial removal.
Solution Approach 2:
The invention carefully controls laser parameters including pulse duration, energy density, and wavelength to achieve selective ablation of the epithelial layer. By optimizing these parameters, the process removes the target layer precisely without transmitting excessive energy to damage deeper structures.
3Manufacturing precision
If laser-induced forward transfer is used to deposit donor cells, then precise placement is achieved, but the process requires alignment and scanning complexity
Solution Approach 1:
The patent combines the ablation and cell deposition processes into a single integrated LIFT operation. The same laser system that removes the epithelial layer also transfers the donor cells in sequence, eliminating the need for separate alignment systems and reducing overall device complexity while maintaining precision.
Solution Approach 2:
The invention uses continuous scanning of the laser beam across the substrate while simultaneously transferring donor cells. This continuous action maintains precise registration between the ablated areas and deposited cells without requiring repeated alignment operations, reducing complexity while preserving manufacturing precision.
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
This approach effectively prepares a biological substrate for transplantation by removing incompatible layers and depositing compatible cells, enhancing the suitability of intestinal tissue for applications like bladder augmentation cystoplasty.
Implementation Method 1
ablating or removing a portion of the receiver substrate via a first laser to expose a target layer of the receiver substrate
Implementation Method 2
irradiating the coating through the back surface of the donor substrate with one or more laser pulses produced by a second laser to transfer a portion of the donor material to the target layer
Data Source
AI summary
A method for cell printing is disclosed. The method includes generating a receiver substrate, ablating or removing a portion of the receiver substrate via a first laser to expose a target layer, generating a donor substrate containing a back surface and a front surface, applying a coating of donor material to the front surface. The method further includes aligning the front surface of the donor substrate to be parallel to and facing the receiver substrate, wherein the donor material is disposed adjacent to the target layer, and irradiating the coating through the back surface of the donor substrate with one or more laser pulses produced by a second laser to transfer a portion of the donor material to the target layer. A system for cell printing is also disclosed.