Bone Cement Piston Spring Wing Locking Mechanism
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Solution Overview
Problem
Existing mixing devices for bone cement require additional components for latching mechanisms, complicating assembly, production, and handling.
Innovation Solution
Integration of spring wings directly on the piston, which snap into place on the housing collar, providing a locking mechanism that secures the piston in a cover position and allows it to be moved forward with increased force for expelling the mixed material, eliminating the need for additional latching components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional components (locking ring) are used to secure the piston in cover position, then the piston can be securely locked, but the device complexity and assembly difficulty increase
Solution Approach 1:
The locking function is merged into the piston itself through integrally formed spring wings that are part of the piston structure. This eliminates the need for a separate locking ring or additional latching components, reducing device complexity while maintaining secure locking capability in the cover position.
Solution Approach 2:
The piston structure provides its own locking mechanism through the spring wings that automatically engage with the housing collar. The piston serves both as the mixing element and as its own locking device, eliminating the need for separate locking components.
2Reliability
If additional components (locking ring) are used for latching mechanism, then the piston can be securely locked, but the manufacturing complexity and assembly effort increase
Solution Approach 1:
The latching function is combined with the piston structure through integrally formed spring wings. This single-piece design eliminates the need for separate latching components, simplifying both manufacturing processes and assembly operations while ensuring reliable latching action.
Solution Approach 2:
The piston structure is self-latching through its own integrated spring wings that engage with the housing collar. This eliminates the need for separate latching mechanisms, reducing manufacturing steps and assembly complexity.
3Device complexity
If spring wings are integrally formed with the piston, then the number of components is reduced, but the force required to move the piston may increase
Solution Approach 1:
The spring wings are designed with elastic properties that allow them to flex and store energy during piston movement. This dynamic behavior enables the spring wings to engage securely in the cover position while still allowing the piston to be moved forward with controlled force when needed for material expulsion.
Solution Approach 2:
The spring wings are designed with specific geometric parameters (inclination angle, thickness, length) that optimize the balance between locking reliability and movability. The spring section with specific angle ranges (10°-60°) allows the wings to provide strong locking while remaining flexible enough to allow controlled movement during operation.
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
Simplifies assembly, production, and handling by reducing the number of required components and effort needed for latching, while ensuring secure locking and efficient material expulsion.
Implementation Method 1
the piston comprises a plurality of spring wings which can be snapped onto a collar of the housing and which release the piston when a force is exerted on it
Data Source
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AI summary
The invention relates to a mixing device (1) for bone cement with a piston (11) for ejecting the mixture, which also serves as a lid. The piston (11) has spring-loaded wings (15) for engaging with a collar (12) of the housing (2).