Modular Brachytherapy Applicator Radial Expansion
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Solution Overview
Problem
Conventional brachytherapy applicators for gynecological treatments are often rigid, making them difficult to secure and position accurately, and they do not effectively accommodate variations in anatomy, leading to suboptimal radiation delivery and increased exposure to healthy tissues.
Innovation Solution
The development of modular brachytherapy applicators with a radially expandable support matrix, comprising compressible segments and a lumen scaffold, allows for customizable fitting to the patient's anatomy, enabling precise positioning and reduced exposure to normal tissues through 3D dose planning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional rigid brachytherapy applicators are used, then structural stability is maintained, but adaptability to anatomical variations deteriorates
Solution Approach 1:
The applicator is divided into multiple compressible segments that can be radially compressed during insertion and then expand to conform to the patient's anatomy. Each segment can independently adapt to local anatomical variations while maintaining overall structural integrity through the lumen scaffold.
Solution Approach 2:
The applicator transitions from a rigid static structure to a dynamic structure that can radially compress and expand. This dynamic behavior allows the applicator to adapt to different anatomical configurations while maintaining structural stability when needed.
2Ease of manufacture
If rigid applicators are used, then manufacturing simplicity is maintained, but ease of operation deteriorates
Solution Approach 1:
The applicator is constructed from multiple compressible segments connected by hinges, allowing simple manufacturing of individual components that assemble into a complex functional structure. This segmentation enables both ease of manufacture and improved operability.
Solution Approach 2:
The applicator incorporates flexible compressible segments that can be easily inserted and positioned within body cavities. These flexible components conform to anatomical surfaces, making the device easier to operate and position compared to rigid alternatives.
3Adaptability or versatility
If radially expandable modular design is implemented, then adaptability to anatomy is improved, but device complexity increases
Solution Approach 1:
The complex adaptability function is achieved through segmentation into standardized modular units. Each segment is relatively simple in design but the combination of segments creates the complex customizable fitting capability needed for different anatomies.
Solution Approach 2:
The compressible segments are nested within each other in a compact configuration during insertion, then expand outward to achieve the final anatomical fit. This nesting principle allows the complex expanded structure to be delivered through a simple insertion path.
4Ease of operation
If compressible segments with hinges are used, then ease of insertion is improved, but structural strength deteriorates
Solution Approach 1:
The applicator combines flexible compressible segments with a rigid lumen scaffold to create a composite structure. The flexible segments provide ease of insertion while the scaffold maintains structural strength and integrity throughout the device.
Solution Approach 2:
The structural strength is distributed across multiple segmented components rather than relying on a single rigid structure. The hinges connect segments in a way that maintains overall structural integrity while allowing compression for insertion.
Data Source
Figure 1A~1B
Figure 2A
Figure 2B~2E
AI summary
Described here are brachytherapy applicators that comprise a modular support matrix. The modular support matrix may define the arrangement of radiation source lumens within the brachytherapy applicator. The modular support matrix can be adjusted to position the radiation sources to obtain a certain dose and dose profile. A series of modular support matrices may be operably connected according to patient anatomy or dosing requirements. Systems and methods for using such modular brachytherapy applicators are also described.