Self-Contained Mold for 3D Cellular Gel Culture and Transport
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Solution Overview
Problem
Current methods for creating 3D tissue surrogates for mechanobiology research face challenges such as high material waste, fragility of samples during early stages of cell culture, and difficulties in transport and extraction due to the need for petri dishes and bio-inert molds.
Innovation Solution
A self-contained mold system comprising a PTFE block, a PLA base, and a removable PTFE sheet coated with silicone grease, allowing for easier sample ejection and transport, reduced media usage, and adaptability to various geometries, made from bio-inert materials to prevent cell reaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional petri dish molds with silicone grease sealing are used, then the mold structure is simple and easy to manufacture, but the samples are fragile and difficult to extract during early cell culture stages
Solution Approach 1:
The mold is divided into separate components: a rigid base structure, a flexible membrane, and a removable lid. This segmentation allows the membrane to remain attached to the base while enabling easy sample extraction by removing the lid, solving the problem of fragile sample handling during early cell culture stages.
Solution Approach 2:
A flexible membrane acts as an intermediary between the rigid mold structure and the cell culture media. This membrane provides a protective interface that maintains structural integrity while allowing easy sample extraction, reducing sample damage during transport and handling.
2Reliability
If cell culture media is used to submerge molds in petri dishes, then cells receive adequate nutrients, but excessive media is wasted
Solution Approach 1:
The flexible membrane encapsulates the cell culture media and tissue surrogate, creating a self-contained system. This allows precise control over media volume, providing adequate nutrients to cells while minimizing media waste by eliminating the need for excessive submersion in a petri dish.
3Object-affected harmful factors
If bio-inert materials like PTFE are used for molds, then cell reactions are prevented, but sample transport and handling remain difficult
Solution Approach 1:
The flexible membrane made from bio-inert material provides both cell reaction prevention and improved handling. The flexibility of the membrane allows the sample to be easily extracted and transported without damage, while the bio-inert properties maintain cellular compatibility and prevent adverse reactions.
4Shape
If gels are cut into shapes after gelation, then specific geometries are achieved, but significant cell waste occurs
Solution Approach 1:
The mold cavity is pre-formed with the desired geometry before cell seeding. This preliminary action allows cells to be seeded directly into the final shape, eliminating the need for post-gelation cutting and significantly reducing cell waste while achieving precise geometric configurations.
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 mold system reduces sample damage during transport, conserves cell culture media, and allows for easier handling and adaptation to different geometries, enhancing the mechanical evaluation and stimulation of tissue surrogates.
Implementation Method 1
a removable sheet inserted between the block and the base... The sheet may be made from polytetrafluoroethylene (PTFE)... and may be coated with silicone grease prior to insertion of the sheet
Implementation Method 2
The liquid is often poured into a petri dish where the liquid will often stiffen and gelatinize over a period of a few days
Data Source
AI summary
A mold capable of preparing a cellular or acellular construct includes a block including a three-dimensional cavity for a sample, a base, and a removable sheet inserted between the block and the base. The sheet may be coated with silicone grease prior to insertion of the sheet between the block and the base. Mechanical constraints may be included at each end of the cavity to constrain cell driven contraction and to allow for gripping the sample after the sample is removed from the mold. The sample may be prepared by partially filling the cavity with gel, filling the remaining portion of the cavity with culture media, and allowing a three-dimensional sample to culture within the cavity for a time. The sample may be transported to a bioreactor and ejected from the mold by removing the sheet and applying pressure to the mechanical constraints.