Balloon Applicator for Minimally Invasive Lung Brachytherapy
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Solution Overview
Problem
Current minimally invasive lung surgery techniques face challenges in delivering effective adjuvant brachytherapy after tumor resection, particularly in accessing and treating peripheral lung tumors with limited instrument access and the need for precise radiation dosing to avoid normal tissue exposure.
Innovation Solution
The development of a balloon applicator system with a substantially rigid shaft for lung resection cavities and a flexible shaft for bronchial applications, allowing for inflation, suction, and precise positioning of a radiation source within the treatment area, enabling controlled delivery of radiation therapy without additional access points and minimizing normal tissue exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional rib spreading is used to provide access for instrumentation, then instrument access is improved, but patient pain increases and recovery time extends
Solution Approach 1:
The patent employs a flexible thoracoscopic shaft that can be introduced through a small incision in the rib cage without requiring rib spreading. The flexible nature of the shaft allows it to navigate the thoracic cavity while maintaining minimal invasive access, thereby reducing patient pain and recovery time while still providing adequate instrument access for brachytherapy application.
2Measurement precision
If a rigid applicator shaft is used for lung resection cavities, then positioning precision is improved, but device complexity increases
Solution Approach 1:
The applicator system is divided into separate functional components: a rigid applicator shaft for positioning and stabilization, a flexible bronchoscopic shaft for navigation and insertion, and a balloon catheter for radiation delivery. This segmentation allows each component to be optimized for its specific function while reducing overall device complexity through modular design.
Solution Approach 2:
The patent introduces a flexible intermediate shaft that acts as a mediator between the rigid applicator shaft and the bronchoscopic insertion site. This flexible shaft can be passed through the bronchus while the rigid shaft provides stable positioning, thereby achieving both precision and reduced complexity through functional separation.
3Reliability
If isotope sources are used for brachytherapy, then radiation delivery is improved, but safety requirements and facility needs increase
Solution Approach 1:
The patent replaces traditional isotope sources with a mechanically controlled x-ray tube system. The x-ray tube can be switched on and off at will, and its output can be modulated by controlling filament current and acceleration voltage. This mechanical/electrical control system eliminates the need for complex safety infrastructure required by isotope sources, while maintaining reliable radiation delivery for brachytherapy treatment.
4Measurement precision
If automated treatment planning is employed, then dose delivery accuracy is improved, but treatment time increases
Solution Approach 1:
The patent performs treatment planning calculations and radiation dose distribution simulations before the actual brachytherapy procedure. By pre-calculating the optimal radiation source positioning and dose delivery parameters based on patient anatomy and tumor location, the system achieves accurate dose delivery while minimizing intraoperative time spent on planning and setup.
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
This approach facilitates precise and safe delivery of brachytherapy, reducing the risk of disease recurrence and normal tissue exposure, making it feasible in various medical facilities with reduced capital and safety requirements.
Implementation Method 1
miniature electronic x-ray tubes which may be switched on and off at will, or which can be modulated with respect to either penetration depth (by controlling acceleration voltage of the x-ray tube) or dose intensity (by controlling filament current)
Implementation Method 2
Balloon applicators generally determine the interior shape of the target tissue (the resection cavity) and position the radiation source at a controlled distance from the tissue to be treated
Implementation Method 3
Because dose generally decreases exponentially with distance from the source, accurate dose delivery is complicated and automated treatment planning is generally employed
Data Source
AI summary
Brachytherapy treatment of a patient's lung tissue following resection is effected using a balloon applicator which is inserted, normally through the same opening used for the surgery, through the chest wall and into the cavity. The lung and chest openings are closed around the applicator and generally sealed around the applicator. A suction port is provided, in a suction circuit of the applicator, to withdraw fluid from the pleural cavity, at intervals as needed, to assure that the lung can be inflated. Different embodiments of suction circuits are disclosed. A bronchial applicator and method are also disclosed.