PDMS Substrate for Deep-UV Live Cell Imaging
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Solution Overview
Problem
Conventional technologies have not utilized polydimethylsiloxane (PDMS)-based devices or substrates for deep-UV microscopy of live cells and tissues, despite their potential due to moderate to low optical absorption in the UV range, limiting their application in label-free imaging.
Innovation Solution
A live cell imaging system comprising a PDMS substrate with a cavity for holding samples, a UV light source, and a UV camera, where the UV light is transmitted through the PDMS substrate to capture images of live cells, enabling deep-UV microscopy without the need for labels or fixatives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional UV-transparent materials such as quartz or fused silica are used for deep-UV microscopy, then optical transmissivity is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent employs PDMS-based microfluidic devices as a cost-effective alternative to expensive conventional UV-transparent materials like quartz or fused silica. PDMS is significantly less expensive and can be readily manufactured in large quantities, making it suitable for deep-UV microscopy applications while maintaining adequate optical transmissivity in the UV range.
Solution Approach 2:
The patent changes the material parameter from conventional UV-transparent materials (quartz, fused silica) to PDMS, which has moderate to low optical absorption in the UV range. This parameter change enables cost-effective deep-UV microscopy while maintaining functional performance, resolving the contradiction between optical transmissivity and manufacturing cost.
2Ease of manufacture
If PDMS-based devices are used for deep-UV microscopy, then manufacturing cost is reduced, but optical absorption increases
Solution Approach 1:
The patent applies local quality by using PDMS specifically for the microfluidic device components where cost reduction is prioritized, while accepting its moderate to low optical absorption characteristics. The device design accommodates PDMS's optical properties by optimizing the imaging setup for deep-UV wavelengths, achieving a balance between manufacturing cost and optical performance.
Solution Approach 2:
The patent accepts the trade-off of increased optical absorption in PDMS compared to quartz, but compensates by using the low-cost PDMS material that can be readily manufactured in large quantities. The moderate to low optical absorption of PDMS in the UV range is sufficient for the intended applications, making the cost benefit outweigh the optical performance compromise.
3Ease of manufacture
If PDMS is used as substrate for UV microscopy, then ease of manufacture and low cost are improved, but application to live cell imaging has been neglected
Solution Approach 1:
The patent extends the versatility of PDMS-based devices by demonstrating their suitability for deep-UV microscopy of live cells and tissues. The device design incorporates features that enable multiple applications including label-free imaging, spectroscopy, and microscopy of various biological specimens, transforming PDMS from a generic microfluidic material to a specialized platform for deep-UV biological imaging.
Solution Approach 2:
The patent changes the application parameter space of PDMS devices from conventional visible light microscopy to deep-UV microscopy. By optimizing the device for UV wavelength transmission and incorporating appropriate imaging components, the patent expands PDMS applicability to include live cell imaging, tissue spectroscopy, and other deep-UV biological applications.
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 system effectively images live cells and tissues using UV light, demonstrating minimal absorption changes in PDMS with UV exposure, thus facilitating low-cost, label-free imaging suitable for medical and biological applications.
Implementation Method 1
PDMS has been widely used for manufacturing of microfluidic devices and flow channels used for study of various biological samples. Previous studies have reported a moderate to low optical absorption for PDMS under ultraviolet (i.e., UV-A, UV-B, and UV-C) illumination which makes the PDMS-based microfluidic devices and substrates favorable to use along with UV-microscopy for label-free imaging of cells and tissues.
Data Source
AI summary
An exemplary embodiment of the present disclosure provides a live cell imaging system, comprising a substrate, a UV light source, and a UV camera. The substrate can have a cavity configured to hold a sample. The sample can comprise one or more live cells. The substrate can be made, at least in part, out of polydimethylsiloxane (PDMS). The UV light source can be configured to direct UV light to the sample. The UV camera can be configured to take a UV image of the sample.