Bone Cement Paste Mixing With Piston-Driven Liquid Transfer
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Solution Overview
Problem
Existing devices for providing bone cement paste face challenges such as complex designs with many moving parts, difficulty in complete conveyance of monomer liquid into bone cement powder, and inefficient gas discharge, leading to incomplete mixing and increased user effort.
Innovation Solution
A device with a mixing unit and reservoir system that allows for the simple, rapid, and application-safe opening of ampoules using a deformable reservoir design, facilitating the introduction of monomer liquid into bone cement powder without mechanical mixing, and includes an outlet channel for gas discharge to enhance mass transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a container is substantially completely destroyed to open and convey monomer liquid, then the monomer liquid can be conveyed into bone cement powder, but the user effort increases and complete conveyance becomes difficult due to fragments
Solution Approach 1:
The device divides the interior space into proximal and distal parts separated by a discharge piston, allowing independent control of monomer liquid conveyance and bone cement powder discharge. This segmentation enables complete conveyance without destroying containers, as the piston can push liquid through the conduit means efficiently.
Solution Approach 2:
The discharge piston acts as an intermediary mechanism between the monomer liquid source and the bone cement powder. Instead of directly destroying containers to push liquid, the piston mediates the conveyance process through controlled movement, achieving complete liquid transfer with minimal user effort.
2Reliability
If mechanical mixing is used to mix monomer liquid with bone cement powder, then mixing is achieved, but the device complexity increases due to mixing rods and additional components
Solution Approach 1:
The invention extracts and removes the mechanical mixing components (mixing rods, stirrers) from the device. Instead of adding complex mixing mechanisms, the design relies on the natural flow of monomer liquid through the conduit means into the bone cement powder, achieving reliable mixing without extra components.
Solution Approach 2:
The system achieves self-mixing through the inherent flow dynamics. The monomer liquid automatically mixes with the bone cement powder as it flows through the conduit means, eliminating the need for external mechanical mixing devices and simplifying the overall structure.
3Reliability
If gas is not discharged efficiently from the interior space, then the mixing process is simple, but air inclusions increase and mixing becomes incomplete
Solution Approach 1:
The gas discharge function is merged with the existing conduit means structure. The outlet channel is integrated into the cartridge design, allowing gas to be discharged simultaneously with monomer liquid conveyance through the same structural pathway, achieving efficient gas removal without adding separate complex discharge systems.
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 ensures efficient, complete, and rapid mixing of bone cement components with minimal user effort, reducing the risk of air inclusions and simplifying the operation by minimizing the number of steps and components.
Implementation Method 1
a conveying piston axially movable in the interior space is arranged in the distal part of the interior space... conveying the monomer liquid from the distal part through the conduit means into the proximal part
Implementation Method 2
a discharge piston axially movable in the interior space is arranged in the interior space, which piston divides the interior space into a proximal part of the interior space and a distal part of the interior space
Implementation Method 3
a reservoir for a monomer liquid as a second starting component, which is connected or connectable in a fluid-conducting manner via an inlet channel to the distal part of the interior space for introducing the monomer liquid from the reservoir into the mixing unit
Implementation Method 4
the reservoir and the mixing unit are connected or connectable in a fluid-conducting manner via an outlet channel, via which a gas can be discharged from the interior space into the reservoir
Data Source
AI summary
A device for providing a bone cement paste from two starting components, comprising a mixing unit comprising a hollow cylindrical cartridge with an interior space, wherein a discharge piston axially movable in the interior space is arranged in the space, which piston divides the interior space into a proximal part of the interior space and a distal part of the interior space, wherein the proximal part and the distal part of the interior space are connected to one another in a fluid-conducting manner via a conduit means, wherein a bone cement powder is stored in the proximal part of the interior space as the first starting component, and wherein a conveying piston axially movable in the interior space is arranged in the distal part of the interior space, and a reservoir for a monomer liquid as a second starting component, which is connected or connectable in a fluid-conducting manner.