Expandable Brachytherapy Apparatus for Seed Migration Control
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Solution Overview
Problem
Conventional LDR brachytherapy techniques face challenges such as seed migration, complexity in dose distribution calculations, and the need for individual seed manipulation, which can be time-consuming and require precise placement to ensure effective radiation delivery while minimizing exposure to healthy tissues.
Innovation Solution
A brachytherapy apparatus and method that includes an elongate body with expandable members capable of being deployed in a target tissue region, allowing for the secure placement and removal of radiation sources, enabling improved fixation and dose distribution with reduced seed migration and simplified implantation processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If LDR seeds are left indwelling and free floating within target tissue, then radiation delivery is simplified, but seed migration occurs compromising treatment precision
Solution Approach 1:
The apparatus transitions from a collapsed delivery configuration to an expanded treatment configuration after implantation. The expandable members are initially collapsed for easy insertion, then expanded to secure the radiation source in precise positions, resolving the contradiction between ease of delivery and placement precision.
2Manufacturing precision
If conventional LDR brachytherapy uses individual seed manipulation through needles, then precise seed placement is achieved, but the process becomes time-consuming and complex
Solution Approach 1:
The invention combines multiple seed delivery functions into a single integrated apparatus. Multiple radiation sources are delivered simultaneously through the expandable members rather than manipulating individual seeds separately, significantly reducing implantation time while maintaining precision through the structured expansion mechanism.
Solution Approach 2:
The apparatus is prepared with multiple radiation sources pre-positioned within the expandable members before implantation. This preliminary arrangement eliminates the need for time-consuming individual seed manipulation during the procedure, as all sources are deployed simultaneously upon expansion.
3Reliability
If LDR brachytherapy requires careful dose distribution calculations and seed mapping, then effective radiation delivery to target tissue is achieved, but the process becomes complex and requires significant clinical expertise
Solution Approach 1:
The target tissue volume is divided into multiple segments, with each expandable member responsible for delivering radiation to a specific segment. This segmentation simplifies dose distribution calculations compared to managing individual seeds throughout the entire volume, as each member's radiation contribution can be calculated independently based on its expanded position.
4Stability of the object's composition
If conventional brachytherapy uses fixed implantation configurations, then treatment stability is maintained, but the ability to adjust for individual patient anatomy is limited
Solution Approach 1:
The apparatus provides dynamic adaptability through its expandable members that can be positioned at various distances from the central axis and oriented to match the specific geometry of the target cavity. Once expanded and secured, the configuration remains stable for the duration of treatment, combining both adaptability and stability.
Solution Approach 2:
Each expandable member can be independently positioned to deliver radiation with locally optimized characteristics tailored to the specific anatomy of different regions of the target tissue. This allows customization for individual patient anatomy while maintaining overall treatment stability through the secured expanded configuration.
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 solution provides secure, repositionable, and removable radiation sources, enhancing the accuracy and efficiency of brachytherapy treatments by minimizing seed migration and simplifying the implantation process, thus improving the delivery of radiation to target tissues while protecting surrounding healthy tissues.
Implementation Method 1
the elongate members being movable from a collapsed configuration for introduction through a tissue tract to a target location, and an expanded configuration
Data Source
AI summary
Apparatus for delivering brachytherapy to a target tissue region includes an elongate body including a proximal end, a distal end sized for introduction into a tissue tract and carrying a plurality of elongate members including pathways for receiving a source of radiation. The elongate members are movable between collapsed and expanded configurations. During use, a tract is created through tissue, and the elongate body carrying the elongate members is advanced through the tract into a target location with the elongate members in the collapsed configuration. The elongate members are directed to the expanded configuration at the target location, and radiation is delivered to treat tissue at the target location, e.g., by introducing one or more radiation sources along the pathways.