In-Vitro Contractile Force Indicator Using Flexible Cantilever Posts
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Solution Overview
Problem
Conventional cell culture systems fail to replicate the three-dimensional interactions between cells and surrounding tissue, limiting the ability to measure contractile forces crucial for understanding tissue development and drug efficacy, as they do not mimic in vivo conditions where cells compact and contract.
Innovation Solution
A device using cantilever mechanics with a rigid and non-rigid post system, where cells or tissues exert force by flexing the non-rigid post, allowing real-time measurement of contractile forces within a hydrogel culture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional cell culture systems are used, then cell growth can be maintained, but the ability to measure contractile forces is lost due to lack of three-dimensional interactions
Solution Approach 1:
The device is segmented into distinct functional components: a mount structure, a rigid post for reference, a non-rigid post for force sensing, and a hydrogel culture medium. This segmentation allows each component to perform its specific function while enabling contractile force measurement through the relative movement between the rigid and non-rigid posts.
Solution Approach 2:
The non-rigid post acts as an intermediary element that transfers the contractile forces generated by cells in the hydrogel to a measurable displacement. The post flexes in response to cellular contraction, converting biological mechanical activity into a quantifiable physical signal without directly interfering with cell growth.
2Reliability
If three-dimensional cell culture is implemented to replicate in vivo conditions, then contractile force measurement becomes possible, but the device complexity increases
Solution Approach 1:
The device utilizes changes in the physical state of the non-rigid post (from straight to flexed) as cells generate contractile forces. By monitoring the positional parameter of the non-rigid post relative to the rigid post, the system translates three-dimensional cellular behavior into a measurable one-dimensional displacement that reflects in vivo-like contractile activity.
Solution Approach 2:
The culture system combines a rigid post (providing structural stability) with a non-rigid post (providing force sensitivity) within a hydrogel matrix. This composite structure allows simultaneous maintenance of three-dimensional cell culture conditions and measurement of contractile forces, replicating in vivo conditions while enabling reliable measurement.
3Ease of manufacture
If fixed rods and horizontal suspension are used, then device simplicity is maintained, but contractile force measurement capability is lost
Solution Approach 1:
Instead of fixing both posts rigidly or suspending them horizontally as in conventional designs, the invention inverts the approach by making one post rigid (for reference) and the other non-rigid (for sensing). The non-rigid post is allowed to flex vertically in response to cellular contraction, enabling force measurement while maintaining manufacturing simplicity.
Solution Approach 2:
The non-rigid post functions as a flexible element that can bend and deform under the influence of cellular contractile forces. This flexibility allows the post to respond to small forces generated by cells, converting them into measurable displacements, while the overall device structure remains simple and easy to manufacture.
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 non-destructive, real-time measurement of contractile forces exerted by cells or tissues, facilitating drug discovery and development by simulating in vivo conditions and providing insights into tissue health and strength over time.
Implementation Method 1
The device utilizes cantilever mechanics and a non-rigid post to enable the determination of the contractile force of cells and tissues
Implementation Method 2
The non-rigid post is sized to deflect based on forces exerted in the culture. The posts are disposed vertically within the cell culture or tissue medium. As the cells or tissues grow, they will constrict and flex the non-rigid post.
Data Source
AI summary
Devices and methods to measure cells and/or tissue's contractile force are disclosed. Included is a mount with rigid, and non-rigid posts sized to flex. Determined is force exerted by contractile cells and tissues in a multiwell plate. The device is designed to fit inside individual wells with posts directed downwards. Posts are attached to a 3D printed circular mount with tabs for depth within the well. The mount has a window for medium changes while the device is positioned inside the well. The cells are seeded within a hydrogel. As the hydrogel condenses, cells/tissue wrap around the post's outside pulling non-rigid post toward rigid post. Inverted light microscope is used to determine deflection of non-rigid post inside the multiwell plate. Movement of the non-rigid post is measured using an acrylic ruler on an underside of the multiwell plate. Contractile forces of cells/tissue are determined using cantilever mechanics.