Radioactive Bone Cement for Spinal Metastasis Treatment
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Solution Overview
Problem
Conventional treatments for spinal metastases, such as vertebroplasty and external beam radiation therapy, are invasive and inconvenient for patients, with external beam radiation therapy limiting the dose to tumors due to collateral damage to adjacent tissues like the spinal cord, requiring multiple treatment sessions and potentially leading to retreatment.
Innovation Solution
The use of radioactive bone cement, which is a matrix material infused with a radioisotope, is positioned near the tumor to deliver a targeted dose of radiation, with the activity concentration determined based on the distance from the tumor and the desired dose, allowing for a single procedure that combines structural reinforcement and radiation therapy, minimizing exposure to adjacent tissues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If external beam radiation therapy is used to treat spinal metastases, then radiation can be delivered to the vertebral body, but adjacent radiosensitive tissues such as the spinal cord and nerves are also irradiated, limiting the dose that can be safely delivered
Solution Approach 1:
The patent applies local quality by incorporating radioisotopes directly into the bone cement at the treatment site, creating a localized radiation source that delivers high doses to the tumor while minimizing exposure to adjacent healthy tissues. The radioisotope concentration is specifically tailored to the local treatment requirements rather than delivering uniform external radiation.
Solution Approach 2:
The bone cement acts as an intermediary carrier that delivers radioisotopes directly to the tumor site. Instead of using external beam radiation that passes through healthy tissue, the cement serves as a localized medium that contains and delivers radiation precisely where needed, mediating between the radiation source and the target tissue.
2Object-affected harmful factors
If external beam radiation therapy is fractionated into multiple treatment sessions to minimize collateral damage, then patient convenience deteriorates due to multiple visits and prolonged treatment time
Solution Approach 1:
The patent merges the radiation therapy function with the bone cement stabilization procedure into a single integrated treatment. The radioisotope-containing cement is injected during the vertebroplasty procedure, combining structural reinforcement and radiation delivery in one step, eliminating the need for separate multiple radiation therapy sessions.
Solution Approach 2:
The bone cement provides continuous localized radiation delivery as it remains in place at the treatment site, delivering therapeutic doses over time without requiring repeated patient visits. The radiation is delivered continuously from the implanted cement rather than in discrete external beam sessions.
3Productivity
If a single fraction of radiotherapy is delivered to maximize treatment effectiveness, then patients tend to require retreatment more often
Solution Approach 1:
The patent employs dynamic control of radiation delivery through the use of radioisotopes with specific half-lives that provide sustained radiation over time. The radiation dose is delivered dynamically as the radioisotope decays, providing continuous treatment effect rather than a static single fraction, which reduces the need for retreatment while maintaining high initial effectiveness.
Data Source
AI summary
A target tissue can be treated with a radioisotope. Some methods for treating a target tissue with a radioisotope include determining a distance between a target tissue and a surface of a matrix material to be positioned adjacent the target tissue and, based on the determined distance, determining an activity to be mixed with the matrix material to obtain a desired activity concentration. Some methods further include mixing the radioisotope with the matrix material. In some embodiments, the matrix material comprises bone cement, and the target tissue is a tumor in a bone. The radioisotope may be a beta-emitting radioisotope mixed in the cement at a concentration to form a radioactive cement.