pH-Responsive Diblock Copolymer for Tumor Imaging
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Solution Overview
Problem
Current intra-operative imaging technologies for tumors face challenges in real-time imaging during surgery due to hardware limitations and lack of specificity, leading to inaccurate tumor boundary determination and prolonged surgery times, with existing imaging agents having limitations in tumor specificity, safety, and clearance rates.
Innovation Solution
A functionalized diblock copolymer that is pH-responsive and degradable, allowing for targeted accumulation at tumor sites through the enhanced permeability and retention effect, emitting fluorescence under near-infrared light for precise tumor imaging and potentially enabling photodynamic therapy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional imaging technologies (X-ray, CT, MRI, ultrasound) are used for pre-operative tumor imaging diagnosis, then imaging capability is provided, but hardware requirements (volume, electromagnetic fields) limit real-time intra-operative imaging diagnosis
Solution Approach 1:
The patent replaces complex hardware-based imaging systems (X-ray, CT, MRI) with a chemical/biological solution: fluorescent imaging agents that emit light when excited by near-infrared laser. This substitution enables real-time imaging without bulky equipment, as the fluorescent signal can be detected with simple optical detectors during surgery.
Solution Approach 2:
The patent changes the imaging modality from hardware-intensive modalities to fluorescence-based optical imaging. By using near-infrared excited fluorescent agents, the system achieves real-time imaging with minimal hardware, transforming the imaging approach to one compatible with intra-operative conditions.
2Measurement precision
If intra-operative ultrasound imaging is used, then contact-based imaging is provided, but application in open tumor surgery is limited and false negatives/positives increase
Solution Approach 1:
The patent uses fluorescent agents that emit specific wavelengths of light (color change) when excited by near-infrared laser. This optical signal provides clear contrast between tumor and normal tissue, enabling precise boundary detection without the limitations of ultrasound contact requirements.
3Reliability
If MRI scanning before surgery with coordinate construction is used, then pre-operative imaging is provided, but tissue deformation or displacement affects navigation quality during surgery
Solution Approach 1:
The patent applies fluorescent imaging agents to the tumor tissue before surgery (pre-loading), so that the tumor is already marked with fluorescent signal. During surgery, real-time fluorescent imaging immediately guides the surgeon without needing to reconstruct coordinates or account for tissue deformation, as the fluorescent marker moves with the tissue.
4Measurement precision
If rapid frozen pathological examination is performed during surgery, then tumor spreading judgment is provided, but examination time takes 45 minutes to several hours
Solution Approach 1:
The patent replaces the complex pathological examination process (requiring tissue sectioning, staining, and microscopic analysis taking 45 minutes to hours) with a simple fluorescent imaging process. The fluorescent agent provides immediate visual feedback on tumor boundaries and metastatic spread during surgery, reducing examination time to seconds or minutes while maintaining diagnostic accuracy.
5Measurement precision
If existing imaging agents are used, then imaging capability is provided, but tumor specificity, safety, and clearance rates are limited
Solution Approach 1:
The patent uses composite fluorescent agents that combine near-infrared excited fluorophores with tumor-targeting moieties. This composite structure provides high tumor specificity through active targeting while the near-infrared excitation offers deep tissue penetration and minimal autofluorescence background, improving both specificity and safety compared to existing agents.
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 diblock copolymer achieves high specificity and safety for tumor imaging, reducing recurrence rates and prolonging patient survival by providing clear tumor boundaries and efficient imaging, with rapid degradation and clearance, addressing the limitations of existing imaging agents.
Implementation Method 1
allowing for targeted accumulation at tumor sites through the enhanced permeability and retention effect
Implementation Method 2
emitting fluorescence under near-infrared light for precise tumor imaging
Implementation Method 3
The diblock copolymer achieves high specificity and safety for tumor imaging, reducing recurrence rates and prolonging patient survival by providing clear tumor boundaries and efficient imaging, with rapid degradation and clearance
Data Source
AI summary
A functionalized diblock copolymer having the chemical structure shown in Formula III is provided. The functionalized diblock copolymer or polymer particles can be widely used in tumor imaging, tumor therapy and other fields. It not only has good safety, realizes faster and adjustable degradation and removal of polymers (by changing the structure and number of functional groups) under acidic conditions, but also has excellent specific and high-quality imaging effects at the target site, with high signal-to-noise ratio, clear boundaries, long half-life, etc., which solves the problem of fluorescence imaging technology in real-time intra-operative navigation, and thus has a good industrialization prospect.