Rotating Shield Brachytherapy for Prostate Dose Shaping
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Solution Overview
Problem
Current prostate cancer treatments, such as robotic surgery, IMRT, and brachytherapy, have varying side effects, costs, and convenience levels, with long-term biochemical control rates inferior to conventional fractionation regimens, and there is a need for a treatment that maximizes tumor control while minimizing toxicity and inconvenience.
Innovation Solution
A rotating shield brachytherapy (RSBT) apparatus and method using a radiation source, applicator, and catheter drive assembly for precise, robotic-controlled delivery of radiation, enabling dose escalation or urethra sparing without increasing toxicity, through a helical motion and robotic positioning system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If single-shot HDR-BT is used for convenient outpatient treatment, then patient convenience and toxicity are improved, but long-term biochemical control is worsened
Solution Approach 1:
The patent employs dynamic rotation of the catheter assembly during radiation delivery, transforming the static conventional HDR-BT approach into a dynamic rotating shield brachytherapy system. This enables dose escalation to the prostate while dynamically sparing the urethra, achieving both improved biochemical control and maintained patient convenience through a single outpatient treatment
Solution Approach 2:
The invention adds a rotational dimension to the traditional linear brachytherapy approach. By rotating the catheter assembly around the prostate, the system creates three-dimensional dose distribution that escalates prostate dose while protecting surrounding structures, particularly the urethra, thereby improving biochemical control without compromising convenience
2Reliability
If dose escalation is applied to improve biochemical control, then tumor control is improved, but toxicity to surrounding structures is worsened
Solution Approach 1:
The rotating shield brachytherapy system applies local quality by delivering high radiation doses specifically to the prostate tissue while creating localized dose shadows that protect surrounding structures. The rotation mechanism enables different portions of the catheter to deliver dose to different prostate regions while sparing the urethra and other adjacent organs at each angular position
Solution Approach 2:
The rotating catheter assembly acts as an intermediary mechanism between the radiation source and the prostate tissue. By introducing this rotational intermediary, the system can modulate dose distribution in real-time, escalating prostate dose while using the rotating shields to block and redirect radiation away from sensitive surrounding structures
3Ease of operation
If conventional HDR-BT is used to deliver radiation, then treatment is convenient, but dosimetric optimization is limited
Solution Approach 1:
The system transforms conventional static HDR-BT into a dynamic rotating shield brachytherapy system. The catheter assembly rotates during radiation delivery, enabling real-time dosimetric optimization through computer-controlled angular positioning and rotation speed modulation, while maintaining single-shot outpatient convenience
Solution Approach 2:
The invention changes multiple parameters simultaneously: rotation speed, angular position, catheter insertion depth, and radiation source strength. These parameter variations enable precise dosimetric optimization tailored to each patient's anatomy and tumor characteristics, while the entire process remains contained within a single convenient outpatient treatment session
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
RSBT achieves significant dosimetric gains, including a 28% increase in prostate D90 dose and 22% reduction in urethra D10 dose compared to conventional HDR-BT, with feasible delivery times, potentially improving long-term biochemical control and reducing toxicity.
Implementation Method 1
A rotating shield brachytherapy (RSBT) apparatus and method using a radiation source, applicator, and catheter drive assembly for precise, robotic-controlled delivery of radiation
Implementation Method 2
The distal end portion of the catheter comprises at least one radiation shield
Data Source
AI summary
A rotating shield brachytherapy (RSBT) apparatus includes a radiation source, at least one applicator, a catheter, a catheter drive assembly, a robotic positioning system, and a connection system. The applicator(s) is configured to be inserted or implanted into a patient. A distal end portion of the catheter has at least one radiation shield and is configured to receive a wire-mounted radiation source. The catheter drive assembly causes helical motion of the catheter and engages the proximal end portion of the catheter to selectively rotate the catheter about a longitudinal axis. The robotic positioning system aligns the catheter drive assembly, in both position and angular orientation at a modifiable rate, with the applicator(s), or to any programmed point in space. The connection system couples the catheter drive assembly to the applicator(s), and further decouple the catheter drive from the applicator(s).