Rotating Shield Brachytherapy Catheter for Asymmetric Dose Delivery
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Solution Overview
Problem
Conventional brachytherapy techniques face limitations in delivering non-radially symmetric radiation doses, leading to suboptimal tumor dose conformity and increased toxicity to healthy tissues, particularly in prostate cancer treatment, where existing methods result in higher urinary and rectal complications.
Innovation Solution
The development of a shielded needle or catheter system with a rotational controller for interstitial rotating shield brachytherapy (I-RSBT) allows for non-radially symmetric dose distributions, reducing doses to sensitive normal tissues and enabling increased radiation to the tumor, thereby potentially reducing treatment sessions and complications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional brachytherapy delivers radially-symmetric dose distributions, then the treatment is simple to implement, but the tumor dose conformity is limited and healthy tissues receive excessive radiation
Solution Approach 1:
The patent applies asymmetry by using a rotating shield that blocks radiation in specific directions, transforming the radially-symmetric dose distribution into an asymmetric one. The shield creates a preferred emission direction that conforms to the tumor shape while sparing adjacent healthy tissues, directly resolving the contradiction between dose conformity and healthy tissue protection
Solution Approach 2:
The patent employs dynamics by implementing a rotating shield mechanism that can dynamically adjust the emission pattern during treatment. The shield rotates to deliver radiation from multiple angles, allowing the dose distribution to adapt to the three-dimensional tumor geometry and improve conformity while reducing exposure to surrounding healthy tissues
2Manufacturing precision
If interstitial needles are used to treat large tumors, then tumor coverage is improved, but the treatment becomes more invasive with increased complications
Solution Approach 1:
The patent applies universality by designing a system that can function both as an intracavitary applicator and deliver interstitial-like dose distributions through the rotating shield mechanism. This single device provides the tumor coverage benefits of interstitial needles without the invasiveness, as the rotating shield creates directional emission patterns that conform to complex tumor geometries from a less invasive position
3Manufacturing precision
If dynamic-shield RSBT uses layered shielding apparatus with independent rotation, then dose distribution is improved, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the shield into multiple independently rotatable layers, each capable of creating different emission patterns. This segmentation allows complex three-dimensional dose distributions to be constructed from simpler two-dimensional patterns, improving dose distribution quality while keeping each individual layer relatively simple in design
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 approach enables more effective cancer treatment with reduced toxicity, improving tumor control probability and patient outcomes by allowing for deliberate non-symmetric dose delivery, thus minimizing side effects and enhancing treatment efficiency.
Implementation Method 1
A radiation source travels inside each needle, depositing a radiation dose pattern inside the tumor
Implementation Method 2
High-dose-rate brachytherapy (HDR-BT) is a technique for treating cancerous tumors
Data Source
AI summary
Systems and methods for rotating shield brachytherapy. In an aspect, some of the systems and methods can be used to facilitate shield selection for use in rotating shield brachytherapy. In an aspect, the invention is a shielded needle or catheter system with a rotational controller for delivering radioisotope-based interstitial rotating shield brachytherapy (I-RSBT). In an aspect, the catheter system can utilize paddle-based RSBT. Further provided are methods and systems for helical RSBT.