Bone Cement Mixing Syringe for High-Viscosity Injection
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Solution Overview
Problem
Existing devices for mixing and injecting bone cement are complex, bulky, and require multiple handling steps, leading to extended surgical times and inefficiency, especially when dealing with high-viscosity cements.
Innovation Solution
A combined mixing and injection device with a vessel, piston assembly, and mixing assembly, allowing for both components to be mixed and injected through a single device, featuring a threaded rod and mixing paddle for efficient handling of high-viscosity cements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate devices are used for mixing and injecting bone cement, then each device can be optimized for its specific function, but the overall device complexity increases and surgical time is extended
Solution Approach 1:
The patent combines mixing and injection functions into a single integrated device. The syringe body serves as both the mixing chamber and injection device, with a plunger that performs both mixing (when moved back and forth) and injection (when pushed forward). This eliminates the need for separate mixing devices and injection devices, reducing the number of handling steps while maintaining functional effectiveness.
Solution Approach 2:
The plunger is designed to perform multiple functions: it mixes the bone cement components by moving back and forth, and then injects the mixed cement by pushing forward. The syringe body also serves dual purposes as both mixing chamber and injection needle housing. This multi-functionality reduces the number of devices needed while maintaining operational reliability.
2Reliability
If multiple devices are used for mixing and injecting, then specific functions are optimized, but the surgical time and handling time increase significantly
Solution Approach 1:
By merging mixing and injection into one device, the patent eliminates the time required to set down one device and pick up another. The surgeon can continuously operate the single device from mixing through injection without interruption, significantly reducing surgical time while maintaining the functional performance needed for effective bone cement application.
Solution Approach 2:
The plunger enables continuous action: after mixing the components by moving back and forth, the same plunger can immediately push the mixed cement forward for injection without requiring device changeover. This continuity eliminates idle time between mixing and injection, keeping the useful action uninterrupted throughout the procedure.
3Ease of manufacture
If conventional mixing devices are used, then mixing can be performed, but they cannot effectively handle high-viscosity bone cement
Solution Approach 1:
The plunger is designed with specific local characteristics: a broad surface area that contacts the bone cement throughout the syringe chamber, enabling effective mixing of high-viscosity materials. The injection needle is also specifically designed with appropriate dimensions and geometry to handle and deliver the viscous cement effectively. These localized design features address the specific requirements for handling high-viscosity bone cement.
Solution Approach 2:
The device parameters (plunger surface area, syringe chamber geometry, needle dimensions) are specifically optimized to handle high-viscosity materials. The plunger's broad contact area and the needle's specific geometry create appropriate flow conditions that enable effective mixing and injection of bone cement with viscosity of at least 80 MPa·s, unlike conventional devices designed for lower viscosity materials.
4Ease of manufacture
If conventional injection devices are used, then injection can be performed, but they cannot effectively inject high-viscosity bone cement
Solution Approach 1:
The injection needle is designed with specific local characteristics including appropriate diameter, length, and geometry to handle high-viscosity bone cement. The needle's dimensions are optimized to create appropriate pressure and flow conditions that enable effective injection of materials with viscosity of at least 80 MPa·s, addressing the specific requirements for viscous material delivery.
Solution Approach 2:
By combining the mixing chamber and injection needle into a single integrated syringe device, the patent ensures that the transition from mixing to injection is seamless. The same device that mixes the high-viscosity cement is also optimized to inject it, eliminating transfer losses and maintaining the cement's integrity throughout the process.
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 device reduces surgical time, minimizes handling, and effectively injects high-viscosity bone cement, reducing the risk of leakage and anesthesia duration.
Implementation Method 1
a piston assembly comprising a threaded rod, a handle located at a first end of the threaded rod and a piston head located at a second end of the threaded rod, the threaded rod: cooperating with the tapped opening of the vessel, extending along the longitudinal axis of the vessel
Implementation Method 2
a mixing assembly comprising a rod, a handle located at a first end of the rod and a mixing paddle located at a second end of the rod, the rod of the mixing assembly extending into the longitudinal internal channel of the threaded rod and into the through-hole of the piston head of the piston assembly, the mixing paddle being arranged in the inner chamber of the vessel
Data Source
AI summary
A device to mix and inject a composition includes a vessel, a piston assembly, and a mixing assembly. The vessel delimits an inner chamber and has a tapped opening. The piston assembly includes a threaded rod, a handle and a piston head. The threaded rod cooperates with the tapped opening of the vessel and includes a longitudinal internal through-channel. The piston head is arranged in the inner chamber and includes a through-hole in the continuation of the longitudinal internal through-channel. The mixing assembly includes a rod, a handle and a mixing paddle. The rod extends into the longitudinal internal through-channel of the threaded rod and into the through-hole of the piston head. The mixing paddle is arranged in the inner chamber.