Intracavitary Brachytherapy Applicator with Inflatable Retraction
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Solution Overview
Problem
Current intracavitary brachytherapy applicators for cervical and uterine cancer treatment are cumbersome, painful, and often require anesthesia, with non-ideal geometry leading to radiation dosimetry issues that can result in unwanted morbidities and potential cancer recurrence due to inadequate bladder and rectum retraction.
Innovation Solution
An advanced intracavitary brachytherapy applicator system featuring a tandem with inflatable ovoids and retractors, integrated with an endoscope for precise placement, allowing for adjustable and minimally invasive implantation, reducing radiation exposure to critical structures by effectively retracting the bladder and rectum from the treatment site.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional FSD applicator is used for intracavitary brachytherapy, then radiation can be delivered to treat cervical and uterine cancers, but the procedure becomes tedious and time-consuming requiring complex assembly and anesthesia
Solution Approach 1:
The patent combines the tandem and ovoids into a pre-assembled unit that can be inserted as a single piece, eliminating the need for complex intra-procedural assembly of 8 separate components. This merging reduces procedural complexity while maintaining the radiation delivery capability for treating cervical and uterine cancers.
Solution Approach 2:
The tandem and ovoids are pre-assembled before patient insertion, allowing the complex configuration to be prepared in advance rather than during the procedure. This preliminary assembly reduces the time and complexity of the actual implantation procedure while ensuring proper geometric configuration for radiation dosimetry.
2Reliability
If traditional FSD applicator is used for intracavitary brachytherapy, then radiation delivery is possible, but the procedure is painful and lengthy requiring conscious sedation or anesthesia
Solution Approach 1:
The tandem and ovoids are pre-assembled into a compact unit before insertion, reducing the procedural time and patient discomfort. This preliminary preparation allows for faster insertion without requiring prolonged anesthesia or sedation, improving patient comfort while maintaining treatment efficacy.
Solution Approach 2:
The applicator is designed as a modular pre-assembled unit that can be inserted as one piece, simplifying the insertion process and reducing procedural time. This segmentation of the assembly process (pre-done outside patient) from the insertion process (done inside patient) reduces patient discomfort and procedural complexity.
3Reliability
If traditional FSD applicator is used for intracavitary brachytherapy, then radiation treatment can be administered, but inadequate bladder and rectum retraction leads to non-ideal geometry and high radiation doses to these organs
Solution Approach 1:
The patent introduces retractor balloons as intermediary devices that physically separate the bladder and rectum from the radiation source. These balloons act as mediators between the radiation-emitting applicator and the sensitive organs, pushing them away to create optimal geometric separation and reduce radiation dose to these organs while maintaining effective tumor treatment.
Solution Approach 2:
The retractor balloons are inflated to preemptively counteract the natural tendency of the bladder and rectum to be in close proximity to the radiation source. This preliminary anti-action prevents the harmful geometric configuration before radiation delivery begins, ensuring optimal dosimetry from the start of treatment.
4Reliability
If traditional FSD applicator requires 3 or 4 implants one week apart, then adequate tumor dose can be delivered, but the treatment duration is extended and patient burden increases
Solution Approach 1:
The pre-assembled tandem and ovoids unit enables more accurate and consistent radiation delivery in a single implantation, potentially reducing the need for multiple fractionated implants. This merging of the applicator components into a precise, pre-configured unit improves dosimetric accuracy that may allow for shorter treatment courses while maintaining tumor 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
The system simplifies and speeds up the implantation process, reduces patient discomfort and complications, provides improved radiation dosimetry, and optimizes tumor dose delivery while minimizing exposure to the bladder and rectum, thus enhancing treatment efficacy and patient recovery.
Implementation Method 1
first and second adjustably inflatable retractors adapted to be releasably coupled to the ovoid assembly
Implementation Method 2
The scientific principle behind this technology is that a highly radioactive source inside an afterloader passes through a transfer guide tube into an applicator implanted in the patient
Data Source
AI summary
Systems and methods are provided for treating cervical and/or uterine cancers in brachytherapy with an intracavitary brachytherapy applicator. The system comprises a tandem adapted for insertion into a cervix of a patient. An ovoid assembly comprises first and second inflatable ovoids and an ovoid support mechanism. The first and second inflatable ovoids are adapted for insertion within fornices of a patient. First and second retractors are adapted to be coupled to the ovoid assembly. The first retractor is adapted to be positioned to retract the bladder of a patient during treatment. The second retractor is adapted to be positioned to retract the rectum of a patient during treatment. The tandem and the first and second inflatable ovoids are adapted to be coupled to a radioactive source to deliver a radiation dose suitable for cancer treatment at a cancerous cervical treatment site in a patient.