Implantable Scaffold with Height-Referenced Geometric Landmarks
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Solution Overview
Problem
Current methods for testing biomaterials for implantation, such as those regulated by ISO 10993, require invasive procedures and large numbers of animal sacrifices, leading to high costs and ethical concerns due to the need for repeated surgical operations and histological analyses.
Innovation Solution
An implantable medical device is created using two-photon laser polymerization to form a three-dimensional matrix with reference means that allows for non-invasive, real-time observation of tissue growth and vascularization using a multiphoton fluorescence-excitation microscope, enabling objective and prolonged analysis without animal sacrifice.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional histological analysis methods are used to validate biomaterials according to ISO 10993 standards, then comprehensive tissue response data can be obtained, but large numbers of animals must be sacrificed and repeated invasive surgical operations are required
Solution Approach 1:
The patent applies preliminary action by implanting a reference scaffold with unique geometric features before the biomaterial testing begins. This reference scaffold remains in place throughout the observation period, enabling continuous non-invasive monitoring of tissue responses at the same location over time, thereby eliminating the need for repeated surgical operations and animal sacrifices while maintaining comprehensive data collection
Solution Approach 2:
The patent replaces the mechanical invasive histological analysis system with an optical imaging system. By using optical microscopy to visualize tissue responses through the reference scaffold, the method substitutes physical tissue extraction and mechanical sectioning with non-invasive light-based observation, thereby reducing animal suffering while preserving measurement precision
2Duration of action of stationary object
If window chambers are implanted to enable intravital microscopy observation, then real-time in-vivo observation of tissue responses is possible, but repeated invasive surgical operations are required and the temporal duration is limited
Solution Approach 1:
The reference scaffold is implanted preliminarily and remains in situ throughout the entire observation period, serving as a permanent landmark that enables continuous optical imaging without the need for repeated surgical access. This preliminary placement extends the observation duration indefinitely while eliminating subsequent invasive operations
Solution Approach 2:
The reference scaffold acts as an intermediary structure that facilitates optical imaging by providing a stable, identifiable reference frame within the tissue. This intermediary element enables long-term observation without requiring direct surgical access to the observation site, thereby extending duration while reducing surgical intervention
3Volume of stationary object
If scaffolds are positioned within window chambers to reduce observation surface area, then observable volume increases, but unique identification of spatial regions at successive intervals becomes difficult
Solution Approach 1:
The reference scaffold incorporates unique geometric features at different spatial locations and heights, creating local quality variations that serve as identifiable landmarks. These distinct local characteristics enable precise spatial identification and tracking of specific regions throughout the observation period, preventing loss of spatial information while maintaining increased observable volume
4Ease of operation
If two-photon laser polymerization is used to create the implantable device, then non-invasive real-time observation is enabled, but complex manufacturing process is required
Solution Approach 1:
The patent uses two-photon laser polymerization to fabricate the reference scaffold, replacing traditional mechanical manufacturing methods. This additive manufacturing approach enables precise control of the scaffold's geometric features and internal structure, creating optically transparent or fluorescent components that facilitate non-invasive observation while maintaining manufacturing feasibility through computer-controlled laser processing
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 solution reduces development costs and animal suffering by allowing non-invasive, real-time monitoring of tissue responses to biomaterials, minimizing the need for surgical operations and animal sacrifice, while providing precise spatial identification and quantitative analysis of inflammatory responses.
Implementation Method 1
implantable medical device for enabling identification of a level referenced to a reference level in an implantable medical device using a multiphoton fluorescence-excitation microscope
Implementation Method 2
said three-dimensional matrix comprises reference means designed to uniquely identify the height of each level from a pre-set reference, using a multiphoton fluorescence-excitation microscope
Data Source
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Figure 5a~5b
AI summary
An implantable medical device obtained by means of two- photon laser polymerisation of a resin to form a three-dimensional matrix, wherein: said three-dimensional matrix comprises a number of levels distributed in height; and said three-dimensional matrix comprises reference means designed to uniquely identify the height of each level from a pre-set reference, by means of a multiphoton fluorescence-excitation microscope; said implantable medical device being characterised in that said reference means comprise a solid having a cross section that varies with height.