Vacuum Indicator Safety Mechanism for Bone Cement Mixing
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Solution Overview
Problem
Existing bone cement mixing devices lack a reliable mechanism to ensure that the bone cement components are mixed under a predetermined vacuum level, which is crucial for maintaining sterility and quality, and to prevent premature mixing.
Innovation Solution
A device with a vacuum indicator that restricts the movement of a safety mechanism until the predetermined vacuum level is reached, allowing safe contact between the bone cement components only when the vacuum indicator has moved to a specific position, indicating the vacuum level has been achieved.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vacuum indicator system is added to ensure proper vacuum level before mixing, then the reliability of the mixing process is improved, but the device complexity increases
Solution Approach 1:
The vacuum indicator piston is nested within the safety device housing, and the safety device itself is integrated into the container support structure. This nesting approach allows multiple functions (vacuum indication, safety restriction, container support) to be combined in a compact arrangement, improving reliability without proportionally increasing device complexity
Solution Approach 2:
The vacuum indicator system is merged with the safety device mechanism. The piston's movement directly controls the safety device's ability to restrict mixing, combining the vacuum monitoring function with the safety interlock function into a single integrated system that ensures proper vacuum level before allowing mixing
2Manufacturing precision
If a safety device with vacuum restriction is implemented, then the manufacturing precision of the mixing process is improved, but the ease of operation deteriorates
Solution Approach 1:
The vacuum indicator piston automatically responds to vacuum level changes within the mixing chamber, moving to the appropriate position (first or second position) based on whether the predetermined vacuum level is achieved. This self-actuating mechanism eliminates the need for manual vacuum level checking or complex control systems, maintaining ease of operation while ensuring precise mixing conditions
Solution Approach 2:
The piston provides visual feedback to the operator about the vacuum level status through its position (first position indicating insufficient vacuum, second position indicating adequate vacuum). This simple feedback mechanism guides the operator's actions without requiring complex instrumentation, balancing manufacturing precision with operational simplicity
3Loss of information
If a visual indicator system is added to show vacuum level, then the loss of information is reduced, but the device complexity increases
Solution Approach 1:
The piston's position serves as a visual indicator of vacuum level status. When the piston is in the first position, it indicates insufficient vacuum; when in the second position, it indicates adequate vacuum. This simple visual indication system provides clear information about vacuum level without requiring complex displays or electronics
Solution Approach 2:
The piston's position is a direct mechanical copy of the vacuum level state within the mixing chamber. The piston moves in response to pressure differential caused by vacuum level changes, creating a physical representation of the vacuum state that is easily observable, thus reducing information loss without adding complex monitoring systems
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
Ensures that bone cement components are mixed under the correct vacuum conditions, preventing air inclusion and ensuring sterility, while providing a visual indicator for surgical staff to confirm the vacuum level has been reached.
Implementation Method 1
The piston is movable between a first position and a second position in response to a pressure differential across the piston
Data Source
Figure 1
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AI summary
A device (10) for storing and mixing bone cement components. The device (10) includes a housing, a safety device (170), and a vacuum indicator (54). The housing defines a mixing chamber (24,36) configured to store a first bone cement component therein. In a first safety position, the safety device (170) prevents contact between the first bone cement component and a second bone cement component in the mixing chamber (24,36). In a second safety position, the safety device (170) permits contact between the first and second bone cement components in the mixing chamber (24,36). The vacuum indicator (54) restricts movement of the safety device (170) from the first safety position to the second safety position when in a first vacuum indicator position. The vacuum indicator (54) permits movement of the safety device (170) from the first safety position to the second safety position when in a second vacuum indicator position.