Radiation-Attenuating Polymer Patch for Breast Brachytherapy
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Solution Overview
Problem
In breast brachytherapy, a significant percentage of patients are disqualified from treatment due to the proximity of the surgical cavity to sensitive structures like skin or bone, resulting in excessive radiation dosage that could cause injury, as existing methods fail to effectively moderate radiation doses locally without compromising the therapeutic dosage to diseased tissue.
Innovation Solution
A flexible, polymer patch with radiation attenuating properties is placed inside the lumpectomy cavity in apposition to at-risk tissues, which can be biodegradable or non-biodegradable, to reduce radiation dosage and protect sensitive structures by either shielding or moderating the incident radiation, allowing for optimal delivery of therapeutic doses to diseased tissue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brachytherapy is delivered to treat diseased tissue margins, then therapeutic radiation dosage is achieved, but adjacent healthy structures receive excessive radiation causing injury
Solution Approach 1:
The patent applies local quality by placing radiation-attenuating material specifically at locations where adjacent healthy structures are at risk, rather than uniformly shielding the entire treatment field. This allows optimal radiation dosage to be delivered to diseased tissue margins while selectively protecting only the vulnerable adjacent structures from excessive radiation exposure.
Solution Approach 2:
The radiation-attenuating material serves as an intermediary element positioned between the radiation source and adjacent healthy structures. This intermediary selectively moderates the radiation dosage, allowing therapeutic levels to reach the target tissue while blocking excessive radiation from reaching sensitive adjacent structures that would otherwise be overdosed.
2Object-affected harmful factors
If radiation dosage is moderated to protect adjacent structures, then radiation injury is prevented, but therapeutic dosage to diseased tissue is reduced
Solution Approach 1:
The shielding material is strategically positioned only in regions where adjacent healthy structures require protection, rather than applying uniform shielding across the entire treatment field. This localized approach ensures that therapeutic radiation dosage is maintained in areas containing diseased tissue while selectively reducing radiation exposure only to vulnerable adjacent structures.
Solution Approach 2:
The patent employs partial shielding action by using radiation-attenuating material of specific thickness and composition that selectively moderates radiation dosage to protective levels for adjacent structures while allowing sufficient therapeutic dosage to penetrate to the diseased tissue margins. The shielding is applied partially, only where needed, rather than excessively blocking the entire radiation field.
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 patch significantly increases the number of patients eligible for breast brachytherapy by protecting adjacent tissues from excessive radiation, enabling the delivery of optimal prescribed doses to target tissues while safeguarding nearby structures, thus enhancing treatment accessibility and efficacy.
Implementation Method 1
A flexible, polymer patch with radiation attenuating properties is placed inside the lumpectomy cavity... to reduce radiation dosage and protect sensitive structures by either shielding or moderating the incident radiation
Data Source
AI summary
A flexible, relatively flat and thin patch, optionally made of biodegradable material, substantially attenuates ionizing radiation from normal but sensitive anatomy during radio-therapy, particularly breast brachytherapy. The patch is of such a thickness as to substantially attenuate radiation by distance or consists of a material that has been formulated with radio-attenuating filler or is of radio-attenuating material. An alternative version consists of a thin patch that is coated with radio-attenuating material.