Bioabsorbable Brachytherapy Microcapsules for Mammogram Interference
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Solution Overview
Problem
Current low-dose rate brachytherapy seeds used for prostate cancer are not optimally suited for breast cancer treatment, due to uncertainties in radiation dose delivery, seed migration, and interference with mammograms from radio-opaque markers, as well as cosmetic and toxicity concerns related to permanent metal implants.
Innovation Solution
A bioabsorbable brachytherapy device featuring microcapsules with radioactive and/or radio-opaque microspheres enclosed in a bioabsorbable support, designed to be absorbed by the body after delivering a therapeutic dose, reducing radiation exposure to healthy tissue and minimizing imaging interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If permanent metal implants with radio-opaque markers are used, then seed location can be identified in post-implant CT scans, but mammograms are confused by the markers creating shadows that look like local recurrence or hide actual recurrence
Solution Approach 1:
The patent removes the radio-opaque marker component from the brachytherapy seed design, extracting only the essential function of location identification while eliminating the harmful interference with mammograms. The seed is designed to be radiolucent in the mammographic energy range, allowing clear imaging without shadow artifacts.
Solution Approach 2:
The patent changes the material composition parameters of the seed capsule and internal components to be radiolucent in the mammographic energy range (20-40 keV), while maintaining appropriate attenuation properties for CT imaging at higher energies. This parameter change allows the seed to be visible for dosimetry verification on CT scans but invisible on mammograms.
2Use of energy by moving object
If traditional brachytherapy seeds are used, then radiation therapy can be delivered, but seed migration occurs and radiation dose delivery becomes uncertain
Solution Approach 1:
The patent employs a biodegradable polymer capsule that dynamically changes properties over time - initially providing structural integrity to prevent migration, then gradually degrading to allow natural body response. The degradation rate is engineered to match the radiation therapy treatment timeline, ensuring stability during treatment followed by controlled dissolution.
Solution Approach 2:
The patent uses composite material structures including biodegradable polymer capsules with specific mechanical and degradation properties, combined with radioactive source materials and radiolucent components. The composite design provides both immediate structural stability to prevent migration and controlled degradation for eventual elimination.
3Productivity
If low-dose rate brachytherapy is used, then a viable alternative to external beam radiation is provided, but permanent metal implants cause cosmetic concerns and potential toxicity
Solution Approach 1:
The patent changes the material composition from permanent metals to biodegradable polymers with controlled degradation rates. The polymer capsule is designed to maintain structural integrity during the treatment period, then gradually degrade and be absorbed by the body, eliminating cosmetic concerns and reducing long-term toxicity risks while maintaining treatment effectiveness.
Solution Approach 2:
The patent implements a temporary implant design where the brachytherapy seed capsule is intentionally designed to degrade and be discarded by the body's natural metabolic processes after completing its therapeutic function. The biodegradable polymer breaks down into biocompatible byproducts that are safely eliminated, avoiding permanent foreign body presence.
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 bioabsorbable device ensures precise radiation delivery to the tumor site while minimizing exposure to healthy tissue and cosmetic concerns, allowing for customizable treatment plans and reduced dosimetry uncertainties, thus addressing the limitations of traditional seed implants.
Implementation Method 1
a plurality of microcapsules on the support. Each of the plurality of microcapsules includes a plurality of microspheres and a bioabsorbable microcapsule wall that encloses the plurality of microspheres
Implementation Method 2
The plurality of microspheres includes radiation-emitting microspheres comprising a radioactive material
Data Source
AI summary
A brachytherapy device includes a bioabsorbable support and a plurality of microcapsules on the support. Each of the plurality of the microcapsules includes a plurality of microspheres and a bioabsorbable microcapsule wall that encloses the plurality of microspheres. The plurality of microspheres includes radiation-emitting microspheres comprising a radioactive material, radio-opaque microspheres comprising a radio-opaque material or a combination thereof.