Customized Gynecological Brachytherapy Applicator with Balloon Molding
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Solution Overview
Problem
Conventional brachytherapy applicators for vaginal cancer treatment are often painful to insert and fail to provide a good fit, leading to anisotropic treatment plans and potential damage to normal tissues due to their rigid, straight design and lack of customization.
Innovation Solution
A personalized, customized applicator is created by molding a semi-rigid or expandable form within the patient's vagina using materials like silicone rubber, which can undergo a reaction to form a stable shape, allowing for precise radiation delivery and adjustment to achieve uniform dose distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a rigid, straight applicator cylinder is used for vaginal cancer treatment, then the applicator can be manufactured with simple structure, but it causes pain on insertion and fails to provide a good fit
Solution Approach 1:
The applicator employs a balloon-expandable structure that transitions from a compressed state during insertion to an expanded state during treatment. The balloon portion can be inflated to expand against the vaginal wall, providing custom fit and comfort while maintaining treatment functionality.
Solution Approach 2:
The applicator utilizes material property changes, specifically the elastic deformation of the balloon portion when inflated. This parameter change allows the applicator to adapt to the patient's anatomy, providing a custom fit that reduces insertion pain while maintaining structural integrity for radiation delivery.
2Ease of manufacture
If a rigid, straight applicator cylinder is used, then manufacturing is simple, but it produces anisotropic treatment plans and fails to deliver uniform dose distribution
Solution Approach 1:
The balloon-expandable design allows the applicator to dynamically adapt to the patient's vaginal anatomy, creating a custom fit that enables isotropic radiation delivery. This dynamic adaptation ensures uniform dose distribution across the treatment target while maintaining manufacturing simplicity.
Solution Approach 2:
The applicator employs an asymmetric design where the balloon portion can be inflated to various degrees and shapes based on patient anatomy. This asymmetry allows the applicator to conform to irregular vaginal contours, enabling precise control over radiation dose distribution while keeping the base structure simple for manufacturing.
3Volume of moving object
If a large applicator is chosen to fit the vaginal cavity, then it can accommodate the treatment cavity, but it causes pain on insertion and fails to provide a good fit
Solution Approach 1:
The applicator uses a dynamic expandable balloon structure that allows gradual expansion during insertion. The balloon can be inflated in stages, progressively adapting to the vaginal cavity size, which reduces insertion pain while achieving a custom fit that large rigid applicators cannot provide.
Solution Approach 2:
The applicator utilizes changes in volume and shape parameters through balloon inflation. This allows the applicator to start small for comfortable insertion and then expand to the required size for treatment, eliminating the need for large rigid applicators that cause pain during insertion.
4Reliability
If conventional straight applicators are used, then the structure is simple and reliable, but anisotropic treatment plans are difficult to achieve
Solution Approach 1:
The balloon-expandable applicator maintains structural reliability during treatment while providing adaptability for various treatment plans. The inflated balloon creates a stable, custom-fitted cavity that can accommodate different radiation source positions and dosing configurations, enabling anisotropic treatment plans with confidence in applicator stability.
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 customized applicator ensures optimal radiation delivery with reduced discomfort and improved fit, enabling more effective and uniform treatment while minimizing damage to normal tissues.
Implementation Method 1
The filler material is preferably capable of undergoing a reaction in which, as examples, a change of state occurs, a foaming process takes place or in which a sufficient change in viscosity occurs such that the cast or molded-in-place applicator retains shape integrity
Implementation Method 2
In brachytherapy, the radiation source is generally placed within a surgically created or naturally occurring cavity in the body... a prescribed dose is selected by the therapist to be administered to a volume of tissue
Data Source
AI summary
A customized gynecological brachytherapy applicator is formed by placing a molded balloon, which is secured to a handle, into a vaginal cavity and then filling the mold balloon with a settable liquid material. The material may be an expanding foam or any other form of curable material that becomes solid, rigid or pliable, when set by chemical action, temperature change, oxidation, a curing means such as a light, or other curing regime. The mold balloon can be elastic or inelastic, depending on the degree to which the applicator is to conform its external surfaces to the vaginal contours. One or more lumina are provided in the set filler material to receive a radiation source, with additional lumina optionally provided for purposes such as drainage or administration of therapeutic agents. The applicator may be withdrawn and reinserted into the vagina during treatment, and selected tissues adjacent to the applicator are irradiated in accordance with a radiation prescription.