Double-Balloon Brachytherapy Catheter with Segmented Radiation Tubes
Solution Overview
Problem
Existing balloon brachytherapy devices for cancer treatment have limitations in dose conformality and homogeneity due to fixed treatment catheter positions, leading to 'hot spots' and 'cold spots' in radiation distribution, which can result in suboptimal treatment outcomes.
Innovation Solution
A double-balloon brachytherapy catheter system with independently adjustable outer and inner balloons and segmented radiation tubes of varying hardness, allowing for precise positioning and angle adjustment of radiation tubes to optimize radiation delivery, reducing hot spots and cold spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If fixed treatment catheter positions are used in balloon brachytherapy devices, then device simplicity is maintained, but radiation dose conformality and homogeneity deteriorate, leading to hot spots and cold spots
Solution Approach 1:
The radiation tubes are made movable through the inner balloon inflation mechanism, allowing dynamic adjustment of catheter positions and angles. The inner balloon, when inflated, pushes the radiation tubes to desired positions, enabling conformal dose distribution while maintaining relatively simple device structure.
Solution Approach 2:
The system changes the physical state of the inner balloon from deflated to inflated, and controls the inflation volume to precisely position the radiation tubes. By varying the inner balloon volume, the radiation tube positions and angles can be adjusted to optimize dose conformality without complex mechanical positioning systems.
2Manufacturing precision
If radiation tubes are made flexible to allow positioning adjustment, then radiation dose homogeneity improves, but tube structural stability deteriorates
Solution Approach 1:
The radiation tubes have segmented hardness with different sections having different flexibility characteristics. The proximal segment is more flexible to allow positioning adjustment, while the distal segment maintaining radiation source stability is stiffer. This local differentiation enables both positioning flexibility and structural stability simultaneously.
Solution Approach 2:
The radiation tubes are divided into multiple segments with different hardness properties along their length. This segmentation allows different parts of the tube to have different mechanical properties - flexible near the balloon for positioning, and stable at the radiation source end for dose delivery consistency.
3Adaptability or versatility
If inner and outer balloons are independently adjustable, then radiation delivery optimization improves, but device control complexity increases
Solution Approach 1:
The outer balloon serves multiple functions: it provides the structural framework for catheter positioning, creates the treatment cavity, and works in conjunction with the inner balloon for precise radiation tube positioning. This multi-functionality reduces the need for separate positioning mechanisms, simplifying the overall control system.
Solution Approach 2:
The inner balloon is nested within the outer balloon, with the inner balloon providing fine-positioning control for radiation tubes while the outer balloon provides the overall structural framework. This nested arrangement allows independent adjustment of both balloons with coordinated action, optimizing radiation delivery without requiring complex integrated control.
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
Enhances radiation dose conformality and homogeneity by allowing for flexible placement of radiation tubes, improving treatment efficacy by maximizing the prescribed dose to target regions while minimizing exposure to critical structures.
Implementation Method 1
an inner-balloon that is selectively filled to an inner balloon size with a liquid substance or air via an inner-balloon-filler, wherein the inner-balloon is positioned inside the outer-balloon, and a plurality of radiation-tubes positioned in association with and moved into a corresponding radiation-delivery position by the inner-balloon
Implementation Method 2
the plurality of radiation-tubes being segmented into segments of differing hardness to selectively expand or contract a length of one or more of the segments to correspond to the radiation delivery position
Data Source
AI summary
A double-balloon brachytherapy catheter includes an outer-balloon that is filled with a liquid substance or air via an outer-balloon-filler. Further, an inner-balloon is filled with a liquid substance or air via an inner-balloon-filler, with the inner-balloon inserted inside the outer-balloon. Additionally, a plurality of radiation-tubes is positioned in association within the inner-balloon, such as to an outside border of the inner-balloon and within the outer-balloon. Each radiation-tube out of the plurality is segmented into segments of differing hardness. In addition, a vacuum-tube can be wrapped around an exterior of the outer-balloon, where the vacuum tube is used to remove fluids and air to create a void. Also, the plurality of radiation-tubes can be configured to run longitudinally along a central shaft of the double-balloon brachytherapy catheter.