Bone Cement Mixing Vessel with Sealed Cover and Conical Extraction
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Solution Overview
Problem
Existing devices for mixing bone cement are costly and inefficient, particularly when dealing with small quantities required for vertebroplasty and kyphoplasty, and often introduce air into the mixture during extraction.
Innovation Solution
A manual mixing vessel with a non-angular shape and a cover that seals airtight after mixing, using a conical extraction device to prevent air from entering during extraction, and a luer cone for minimizing exposure to monomer vapors, allowing for precise and cost-effective mixing and extraction of small quantities of bone cement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a motor-driven stirrer is used to mix bone cement, then mixing efficiency is improved, but air inclusions are introduced into the mixture
Solution Approach 1:
The patent replaces the motor-driven stirrer with manual stirring using a stirring rod. This substitution eliminates the high-speed rotation that causes air entrapment while still achieving adequate mixing for small quantities of bone cement.
Solution Approach 2:
The patent uses a non-angular mixing vessel shape that provides sufficient mixing action for small quantities without the excessive mechanical action that would trap air. The vessel geometry itself contributes to the mixing process.
2Object-generated harmful factors
If a suction pump is used to remove air during mixing, then air inclusions are reduced, but device complexity and cost increase
Solution Approach 1:
The patent extracts the air removal function from the mixing process by using a separate extraction syringe that withdraws air through the cover opening after mixing is complete, rather than attempting to remove air during the mixing process itself.
Solution Approach 2:
The cover is designed with a central opening that allows air to be evacuated before the extraction syringe is inserted. This preliminary air removal prevents air inclusions without requiring complex equipment during mixing.
3Quantity of substance
If a large mixing vessel is used, then substantial amounts of bone cement can be mixed, but the quantity required for vertebroplasty is excessive
Solution Approach 1:
The patent employs a disposable mixing vessel and cover system designed for single use with small quantities of bone cement. This eliminates the need for expensive, reusable equipment while providing adequate capacity for the required amount.
Solution Approach 2:
The mixing system is segmented into separate components (mixing vessel, cover, extraction syringe) that can be used independently for small quantities, rather than requiring a single large-scale system.
4Ease of operation
If air is allowed to enter the extraction syringe during extraction, then extraction is simpler, but air inclusions contaminate the bone cement
Solution Approach 1:
The cover acts as an intermediary between the mixing vessel and the external environment. It provides a sealed interface with a central opening that allows the extraction syringe to access the bone cement while preventing air from entering the syringe during extraction.
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 solution provides a cost-effective and efficient method for mixing and extracting small quantities of bone cement while preventing air from entering the mixture, ensuring accurate mixing ratios and minimizing exposure to monomer vapors, thus enhancing the safety and efficacy of bone cement use in vertebroplasty and kyphoplasty procedures.
Implementation Method 1
By this, air originally present between bone cement and cover is pressed out between the side walls of the vessel and cover as well as through the center opening
Implementation Method 2
Inserted in said extraction device are one extraction syringe, or several in succession, with which the mixed bone cement can be extracted by suction from the mixing vessel
Implementation Method 3
During the suction process, outer air pressure presses the cover downward in a manner corresponding to the quantity of bone cement extracted by suction
Data Source
AI summary
Device and method for mixing bone cement, for injection into vertebra in particular, comprising a mixing beaker (1), manual stirring rod (6) and a cover (2), which fits in said mixing beaker (1) with a perfect fit, and the lowermost point of which features an extraction hollow cone (3) in which an extraction syringe for extraction by suction of bone cement mixed in said mixing beaker (1) is provided.