Cryogenic Specimen Lifting Mechanism for Dewar Loading
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Solution Overview
Problem
Handling and loading of cryogenic specimens, such as whole cryoprotected human bodies, into Dewar vessels is challenging due to the need for rapid transfer while minimizing exposure to liquid nitrogen and ensuring precise control over the loading process.
Innovation Solution
A lifting system comprising an upper member with a handle and locking mechanism, and a lower member with an attachment point and backboard, designed to securely lift and position cryogenic specimens within Dewar vessels, allowing for controlled manipulation and reduced risk of exposure to liquid nitrogen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual handling of cryogenic specimens is used, then simplicity of operation is maintained, but safety and control during loading are insufficient
Solution Approach 1:
A lifting mechanism serves as an intermediary device between the operator and the cryogenic specimen. The mechanism includes a backboard that attaches to the specimen, vertical shafts for lifting, and a locking mechanism for securing the specimen in place. This intermediary system provides mechanical advantage and control while maintaining operational simplicity for the user.
2Loss of time
If rapid transfer of cryogenic specimens is performed, then exposure time to liquid nitrogen is reduced, but control over loading position is lost
Solution Approach 1:
The lifting mechanism incorporates dynamic control features including a locking mechanism that can secure the specimen at various positions during the loading process. The mechanism allows for controlled lowering and raising of the specimen, enabling the operator to pause and adjust positioning while still achieving rapid transfer compared to manual handling.
Solution Approach 2:
The handling system is segmented into distinct functional components: a backboard for attachment to the specimen, vertical shafts for lifting motion, and a locking mechanism for position control. This segmentation allows each component to perform its specific function efficiently, enabling both rapid transfer and precise control.
3Ease of operation
If heavy cryogenic specimens are handled manually, then equipment complexity is minimized, but operator safety and precision are compromised
Solution Approach 1:
The lifting mechanism uses vertical shafts and a locking mechanism that effectively counterbalance the weight of the cryogenic specimen. The backboard distributes the weight across the specimen, while the locking mechanism secures the load during lifting and positioning, making heavy specimens manageable with minimal operator effort.
Data Source
AI summary
A lifting mechanism for a placement of a cryogenic specimen in a cryogenic storage chamber or Dewar vessel, the lifting mechanism comprising and upper member and a lower member. The upper member may comprise a handle, an upper shaft coupled to the handle at a first end, and a locking mechanism. The lower member may comprise an attachment point and a backboard. The lower member may be coupled at a second end of the upper shaft. The backboard may be coupled to the attachment point by a lower shaft and configured to support the cryogenic specimen.