Paste-Powder Bone Cement Injection System
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Solution Overview
Problem
Conventional polymer bone cements require mixing and waiting processes, leading to increased operating time, variability in application, and the need for complex and costly equipment, which complicates clinical procedures and increases medical expenses.
Innovation Solution
A paste-powder binary bone cement system that forms a viscous dough without waiting, allowing direct injection and minimizing air exposure, eliminating the need for vacuum mixers and high-pressure injectors, and reducing the complexity and cost of the application process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional powder-liquid bone cement is used, then the bone cement can be formed into a doughy mixture through mixing and waiting, but the operating time is increased and clinical procedures become complicated
Solution Approach 1:
The paste component is pre-prepared by dissolving polymer powder in liquid monomer before the surgical procedure. This preliminary action eliminates the need for on-site mixing and waiting, allowing the bone cement to be directly injected into the bone defect without increasing operating time while maintaining reliable fixation through controlled polymerization
2Reliability
If conventional powder-liquid bone cement mixing is used, then the bone cement forms a doughy mixture, but technical variability among doctors increases due to manual mixing differences
Solution Approach 1:
The manual mechanical mixing process is replaced by an automated injection system that delivers pre-mixed paste component and powder component in controlled ratios. This substitution eliminates technical variability among doctors while maintaining reliable bone cement fixation through consistent composition and controlled polymerization
3Reliability
If conventional bone cement injection is used, then vacuum mixers and high-pressure injectors are required, but device complexity and medical expenses increase
Solution Approach 1:
The complex vacuum mixing system and high-pressure injection equipment are extracted from the necessary components. The invention uses a simplified syringe-based delivery system where the paste component is pre-mixed and stored in a syringe, eliminating the need for vacuum mixers and high-pressure injectors while maintaining reliable bone cement injection
Solution Approach 2:
The invention replaces expensive, complex reusable equipment (vacuum mixers, high-pressure injectors) with simple, inexpensive disposable syringes. This substitution maintains reliable bone cement injection while significantly reducing device complexity and medical expenses
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 system reduces operating time, minimizes technical variability among doctors, facilitates easy injection, and decreases medical expenses by eliminating the requirement for additional instruments, while maintaining suitable viscosity and polymerization control for effective bone cement application.
Implementation Method 1
a paste component (Vs) prepared by preliminarily dissolving a first powdered composition in a liquid component
Implementation Method 2
exothermic radical polymerization starts. That is, the exothermic radical polymerization is performed by reacting benzoyl peroxide, which is a polymerization initiator included in the powder component, with methyl methacylate
Implementation Method 3
exothermic radical polymerization starts
Data Source
Figure 1~2
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Figure 5~6
AI summary
The present invention relates to a paste-powder binary bone cement used in arthroplasty or vertebroplasty, and, more particularly, to a paste-powder binary bone cement which can be directly used at a site to be treated without additionally waiting it to the site by dissolving predetermined chemically-unreactive powdered compositions in a liquid monomer to form paste having high viscosity and then mixing other powdered components with the paste in a minimum amount of air, and to an apparatus for injecting the same.