Photosensitive Polymers for Controlled Nitric Oxide Release
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Solution Overview
Problem
Current biomedical devices lack the ability to dynamically control nitric oxide (NO) release after implantation, which is crucial for preventing inflammatory responses and improving biocompatibility with tissues.
Innovation Solution
Development of photosensitive polymers that release NO in response to light intensity and wavelength, allowing for controlled and external on/off triggering of NO generation, and are designed to be used as coatings or components in medical devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If biomedical devices are implanted in the body, then they can perform medical functions, but they trigger foreign body responses and inflammatory reactions due to lack of biocompatibility
Solution Approach 1:
The patent applies preliminary action by incorporating photosensitive NO-donating moieties into the polymer structure before implantation. The device is pre-prepared with the capability to release nitric oxide, which will be activated later by light exposure. This preliminary incorporation of functional groups allows the device to immediately begin reducing foreign body responses once activated, rather than requiring post-implantation modification.
Solution Approach 2:
The patent utilizes parameter changes by controlling the release of nitric oxide through light-induced changes in the photosensitive moieties. By varying light parameters (wavelength, intensity, duration), the device can dynamically adjust NO release rates to match physiological needs, thereby optimizing biocompatibility and reducing inflammatory responses at different stages of implantation.
2Reliability
If NO is released continuously to prevent inflammatory responses, then biocompatibility improves, but loss of control over NO release timing and location occurs
Solution Approach 1:
The patent replaces mechanical or chemical trigger systems with an optical control system. Instead of using mechanical pressure, chemical reactions, or electrical stimuli to trigger NO release, the invention employs light as a non-invasive control mechanism. This substitution allows for precise spatial and temporal control of NO release without the complications associated with other triggering mechanisms, thereby maintaining both biocompatibility and operational control.
Solution Approach 2:
The patent introduces light as an intermediary between the operator and the NO release mechanism. The photosensitive moieties act as mediators that convert optical energy into chemical reactions leading to NO release. This intermediary system allows for indirect control of NO release, enabling precise timing and location control while keeping the device structure simple and biocompatible.
3Measurement precision
If photosensitive polymers are used to enable controlled NO release, then precision control improves, but device complexity increases
Solution Approach 1:
The patent merges the structural components of the polymer with the functional NO-donating moieties into a single integrated material system. Rather than using separate layers or components for structural support and NO release, the invention combines these functions into one photosensitive polymer material. This merging reduces the number of discrete components and simplifies the overall device architecture while maintaining precise control capabilities.
Solution Approach 2:
The patent applies universality by designing the photosensitive polymer to perform multiple functions simultaneously: providing structural support, enabling controlled NO release, and offering biocompatibility. The photosensitive moieties are incorporated into the polymer backbone or side chains, allowing the same material to serve as both the structural matrix and the active NO-donating component, thereby reducing device complexity.
4Adaptability or versatility
If NO release is activated after implantation, then dynamic control is achieved, but initial foreign body response cannot be prevented
Solution Approach 1:
The patent addresses the time delay issue by incorporating the photosensitive NO-donating moieties into the polymer structure during manufacturing, before implantation. This preliminary preparation ensures that the device is ready to release NO immediately upon light activation, eliminating any delay associated with post-implantation activation. The only delay is the time required for light delivery, which can be minimized by using flexible optical fibers or integrated light sources.
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 solution enables precise control over NO release, preventing foreign body responses and improving biocompatibility by selectively releasing NO into tissues, thereby enhancing the performance and longevity of medical devices.
Implementation Method 1
photosensitive polymers that release NO in response to light intensity and wavelength
Data Source
AI summary
The present invention provides stable, photosensitive polymers that release NO response to intensity and wavelength of light, methods of making such polymers and methods using such polymers.