Automated Heat Seal and Cut for Radioactive Cassette Ejection
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Solution Overview
Problem
Existing automated PET tracer synthesis systems require manual disconnection of the cassette from the extension line, leading to radiation exposure and contamination risks for operators, as well as inefficiencies in cassette replacement between runs.
Innovation Solution
The system employs heat sealing and cutting of thermoplastic tubing to automate the disconnection of the outlet line, allowing for hermetic sealing and safe removal of the cassette without manual intervention, reducing radiation exposure and contamination risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual disconnection of the cassette from the extension line is performed, then the operator can control the disconnection process, but radiation exposure and contamination risks increase
Solution Approach 1:
The system performs the disconnection operation automatically without requiring operator intervention. The heat sealing device seals the tubing at a predetermined position, and the cutting device cuts the sealed tubing, enabling the cassette to be ejected into the waste container autonomously. This eliminates manual disconnection steps and associated radiation exposure risks.
Solution Approach 2:
The manual mechanical disconnection process is replaced with an automated thermal and mechanical system. Heat sealing uses thermal energy to bond the tubing, and cutting uses mechanical or laser means to sever the sealed section, replacing the need for manual manipulation of connectors and valves in a radiation field.
2Loss of time
If the cassette is removed quickly in an automated fashion, then radiation exposure time is reduced, but the complexity of the automated ejection mechanism increases
Solution Approach 1:
The automated ejection mechanism is divided into distinct functional modules: a heat sealing device that applies thermal energy at a predetermined position, a cutting device that severs the sealed tubing, and an ejection mechanism that transfers the cassette to the waste container. This segmentation allows each component to perform its specific function independently, reducing overall system complexity.
Solution Approach 2:
The heat sealing device seals the tubing at a predetermined position before the cutting and ejection steps. This preliminary sealing action creates a controlled break point in the tubing, ensuring that the subsequent cutting and ejection processes occur in a predetermined, safe manner without requiring complex real-time control.
3Extent of automation
If heat sealing and cutting of thermoplastic tubing is implemented, then automated disconnection is achieved, but additional equipment and process steps are required
Solution Approach 1:
The heat sealing device changes the physical state of the thermoplastic tubing by applying thermal energy, transforming it from an unsealed state to a sealed state at the predetermined position. This parameter change (temperature) enables the subsequent cutting and automated disconnection without requiring complex mechanical sealing mechanisms.
Solution Approach 2:
Heat sealing acts as an intermediary step between the tubing and the cutting/ejection process. By first sealing the tubing at a controlled position, the system creates a stable structure that can be reliably cut and ejected, simplifying the overall automated disconnection mechanism compared to direct cutting or mechanical sealing approaches.
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 enables fully automated ejection of the cassette into a shielded container, minimizing operator exposure and potential contamination, and facilitates back-to-back runs by eliminating manual disconnection steps, thus enhancing safety and efficiency in PET tracer synthesis.
Implementation Method 1
heat sealing and cutting of thermoplastic tubing to automate the disconnection of the outlet line, allowing for hermetic sealing
Implementation Method 2
cutting the tubing where it is sealed in such a way that there is no risk of environmental contamination with radioactive material
Data Source
AI summary
The present invention relates to systems and methods to facilitate replacement between runs of a kit or cassette from an automated radiosynthesis device located in a hot cell. The method and apparatus of the invention enable automated disconnection of the outlet line by sealing the tubing hermetically by means of heat and by cutting the tubing where it is sealed in such a way that there is no risk of environmental contamination with radioactive material. The invention enables disconnection of the outlet line without manual intervention before opening the shielded enclosure.