Expandable Brachytherapy Apparatus Seed Migration Control
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Solution Overview
Problem
Conventional LDR brachytherapy techniques face challenges such as seed migration, lack of removability, and variability in seed placement accuracy, requiring complex dose distribution calculations and extensive implantation processes, which are time-consuming and limited by linear delivery methods.
Innovation Solution
An expandable brachytherapy apparatus with elongate members that can be collapsed for introduction through tissue tracts and expanded to a target location, allowing for secure placement and removal of radiation sources, along with a method for imaging and dose planning using marker devices to enhance accuracy and efficiency.
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 and placement accuracy deteriorates
Solution Approach 1:
The apparatus segments the seed delivery system into multiple elongate members that can be independently positioned and secured within the target tissue, allowing precise placement while maintaining operational simplicity
Solution Approach 2:
The apparatus performs preliminary action by pre-positioning and securing the radiation sources within the target tissue before radiation delivery begins, preventing migration during treatment while maintaining simple delivery procedures
2Loss of time
If LDR seeds are implanted for extended periods, then fewer healthcare facility visits are required, but seed removability and repositionability are lost
Solution Approach 1:
The apparatus employs dynamic securing mechanisms that allow the radiation sources to be firmly held during treatment but easily removed or repositioned when needed, providing adaptability throughout the treatment timeline
Solution Approach 2:
The apparatus introduces intermediary securing structures that temporarily hold the radiation sources in place during treatment, allowing for easy removal or repositioning by healthcare providers when treatment completion or adjustment is required
3Device complexity
If conventional linear needle delivery methods are used, then implantation procedure is simple, but ability to achieve desired therapy profiles requires numerous implants and complex dose distribution calculations
Solution Approach 1:
The apparatus transitions from linear needle delivery to multi-dimensional elongate member structures that can be positioned at various angles and orientations within the target tissue, achieving complex therapy profiles with fewer implants while maintaining procedural simplicity
Solution Approach 2:
The apparatus employs dynamic positioning capabilities where elongate members can be adjusted and repositioned during implantation to optimize radiation delivery patterns, reducing the number of implants needed while maintaining treatment efficiency
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. The apparatus may include features to prevent overexpansion of the elongate members and/or to facilitate rapid collapse of the elongate members.