Intraoperative Breast Brachytherapy Applicator with Dynamic Source Positioning
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Solution Overview
Problem
Current radiation therapy methods for intraoperative treatment of proliferative diseases, such as breast tumors, lack applicators suitable for open surgical fields, leading to inefficiencies and challenges in delivering precise radiation doses, especially when the resection cavity is eccentric relative to the tumor, and existing isotopic sources require costly and inconvenient setups.
Innovation Solution
A rigid, transparent-to-radiation cup applicator with a radiation-attenuating bottom and a tubular source guide, allowing for precise placement and manipulation of a miniature x-ray tube or isotope source within the cavity, enabling controlled radiation delivery and accommodating irregular cavity shapes through adjustable source positioning and shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional isotopic brachytherapy sources are used, then radiation treatment can be delivered, but the treatment requires costly and inconvenient setups with heavily shielded rooms and patient isolation
Solution Approach 1:
The patent replaces traditional isotopic radiation sources with a miniaturized electronic x-ray tube that generates x-rays on-demand. This substitution eliminates the need for heavy shielding, specialized facilities, and patient isolation protocols, as the electronic source can be precisely controlled and turned off when not in use, thereby resolving the contradiction between reliable radiation delivery and reduced facility complexity
Solution Approach 2:
The patent changes the fundamental parameter of the radiation source from isotopic (continuous emission) to electronic (controllable emission). The electronic x-ray tube allows precise control over radiation generation timing and intensity, transforming the treatment delivery mechanism to eliminate requirements for heavily shielded rooms and complex handling procedures
2Object-affected harmful factors
If the radiation source is spatially separated from the target tissue, then normal tissue exposure is reduced, but the precision of dose delivery to the resection cavity decreases
Solution Approach 1:
The patent employs a dynamic positioning system where the miniaturized radiation source can be moved along a source guide within the applicator cup. This dynamic adjustment allows the source to be positioned at optimal distances from the resection cavity wall, enabling precise dose delivery to target tissue while maintaining spatial separation to protect normal tissues, thus resolving the contradiction between protection and precision
3Adaptability or versatility
If a rigid cup applicator is used to fill the resection cavity, then the applicator can accommodate irregular cavity shapes, but the applicator structure becomes more complex
Solution Approach 1:
The patent divides the applicator into distinct functional segments: a rigid cup structure to define the treatment volume, a separate source guide mechanism for radiation delivery, and an independent positioning system. This segmentation allows the rigid cup to effectively accommodate irregular cavity shapes while keeping each component relatively simple and manageable, resolving the contradiction between adaptability and structural complexity
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
Facilitates efficient, precise, and cost-effective intraoperative radiation therapy by reducing radiation exposure to normal tissues, allowing treatment in various settings, including rural areas, and improving treatment duration and convenience.
Implementation Method 1
the bottom of which is optionally attenuating in order to shield the underlying tissues and organs from harmful radiation
Implementation Method 2
a rigid cup of predetermined shape, the sides of which are transparent to radiation and visible light
Data Source
AI summary
A device for administering brachytherapy to a patient includes a vessel that may be in the form of a hollow cylindrical cup, for fleshing into and substantially filling the open-ended cavity. The vessel has a closed outer end, which may be a removable cover, and a source guide penetrates the closed outer end so as to extend deep into the vessel, to receive a radiation source in the source guide. A manipulator can be connected to the radiation source, and also to the source guide, for allowing several different types of manipulation of the source orientation and position within the vessel during the brachytherapy procedure.