Bone Cement Cartridge Screw Press for Lower Manual Force
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Solution Overview
Problem
Existing bone cement discharge apparatuses struggle with high manual force requirements and complexity, particularly when handling larger quantities, leading to difficulty in operation and potential air inclusion due to manual mixing and measurement inaccuracies.
Innovation Solution
A simple apparatus with a threaded rod and adapter unit, featuring optimized thread dimensions and materials, reduces friction through a carefully designed external thread surface area, allowing for easy manual operation and efficient discharge of bone cement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If existing bone cement discharge apparatuses are used, then bone cement can be discharged, but high manual force is required and operation becomes difficult
Solution Approach 1:
The apparatus divides the discharge mechanism into separate functional components: a threaded rod for force application, an adapter unit for cartridge connection, and a discharge piston for cement ejection. This segmentation allows each component to be optimized independently, reducing the overall force required compared to integrated manual systems.
Solution Approach 2:
The threaded rod acts as an intermediary mechanism that converts rotational motion into linear motion with mechanical advantage. By using the thread geometry, a small rotational force applied to the handle generates a larger linear force on the discharge piston, significantly reducing the manual force needed compared to direct pushing mechanisms.
2Ease of operation
If existing discharge apparatuses are used, then bone cement discharge is possible, but the apparatus structure becomes complex
Solution Approach 1:
The adapter unit serves multiple functions: it connects to the cartridge, provides structural support, guides the threaded rod, and seals the cement chamber. This multi-functionality reduces the need for additional separate components, simplifying the overall apparatus structure while maintaining ease of operation.
Solution Approach 2:
The invention combines the connection mechanism and the discharge mechanism into a single integrated adapter unit that attaches to the cartridge. This merging of functions into one component reduces the number of separate parts and assembly steps compared to systems that separate the connection and discharge functions into different apparatuses.
3Ease of manufacture
If manual mixing is used, then bone cement can be prepared, but air bubbles are incorporated and mechanical properties are negatively influenced
Solution Approach 1:
The invention replaces manual mixing with a mechanical mixing mechanism consisting of rotating blades or paddles that mix the cement powder and monomer liquid within the cartridge. This mechanical mixing system eliminates the incorporation of air bubbles that occurs during manual spatula mixing, while still being simple to operate and prepare.
4Ease of manufacture
If manual mixing and measurement is used, then bone cement preparation is possible, but measurement accuracy and mixing adequacy are not ensured
Solution Approach 1:
The cartridge is pre-filled with the exact amount of bone cement powder and monomer liquid required for the procedure. This preliminary preparation ensures precise measurement and correct proportions without requiring manual measurement during surgery, while still allowing easy preparation and operation of the mixing mechanism.
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
The apparatus enables easy and efficient discharge of bone cement with reduced manual force, facilitating handling of larger quantities and minimizing air inclusion, suitable for surgical applications.
Implementation Method 1
The apparatus (10) comprises a threaded rod (20) with an external thread (22), a handle (24) for rotating the threaded rod (20), and an adapter unit (26) for mechanical connection to a cartridge (12) for bone cement, having a passage (27) with an internal thread (28) for the threaded rod (20)
Implementation Method 2
an outer surface of a thread of the external thread is at most 370 mm2
Data Source
AI summary
An apparatus for pressing out bone cement from a cartridge, to a use of the apparatus, and to a system for pressing out bone cement. An apparatus for pressing out bone cement from a cartridge comprises a threaded rod with an external thread, a handle for rotating the threaded rod, and an adapter unit for mechanically connecting to a cartridge for bone cement. The adapter unit has a passage with an internal thread for the threaded rod. An outer surface of a thread turn of the external thread is not more than 370 mm2.