Dual-Chamber Syringe Reducing Extrusion Force for Viscous Fluids
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Solution Overview
Problem
Traditional syringes face challenges when injecting high viscosity materials, such as dermal fillers, due to increased extrusion force and length, leading to user discomfort and potential needle disengagement, which can affect patient safety.
Innovation Solution
A dual-chamber/dual-plunger syringe design that splits the fluid chamber into two or more chambers with separate plungers, reducing extrusion force by allowing each plunger to be locked in place as it dispenses its chamber's volume through a shared needle, minimizing the overall length and force required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the cross-sectional area of a traditional syringe is increased to accommodate significant volumes of material, then the volume capacity is improved, but the extrusion force required increases making it problematic for viscous fluids
Solution Approach 1:
The syringe is divided into multiple separate chambers (first chamber, second chamber, etc.), each with its own plunger. This segmentation allows each chamber to be operated independently with smaller cross-sectional areas, reducing the extrusion force required for each individual plunger while maintaining the total volume capacity of the syringe system.
2Volume of moving object
If the length of a traditional syringe is increased to accommodate significant volumes of material, then the volume capacity is improved, but the overall device length increases reducing user comfort and control
Solution Approach 1:
By dividing the syringe into multiple shorter chambers arranged side-by-side rather than end-to-end, the total volume capacity is maintained while the overall length of the device is reduced. Each chamber has its own plunger, allowing independent operation within a compact form factor that improves user comfort and control.
3Reliability
If a traditional syringe is used for high viscosity materials, then the injection function is achieved, but the extrusion force increases leading to potential needle disengagement and reduced patient safety
Solution Approach 1:
The segmentation into multiple chambers with individual plungers distributes the extrusion force requirements across multiple smaller actuators. Each plunger operates on a smaller cross-sectional area, generating lower extrusion forces that are sufficient for viscous materials without exceeding the threshold that could cause needle disengagement, thereby improving patient safety.
Solution Approach 2:
The locking mechanisms provide dynamic control during operation, allowing each plunger to be securely held in position during injection to prevent accidental movement or disengagement, while still allowing controlled movement when injection is intended. This dynamic control enhances reliability and patient safety.
Data Source
AI summary
A syringe is disclosed. The syringe may include a syringe body with a fluid chamber, the syringe body having a distal end and a proximal end, with an extrusion opening at the proximal end; a dividing wall disposed within the fluid chamber, defining a first fluid chamber and a second fluid chamber, the first fluid chamber and the second fluid chamber in communication with the extrusion opening; a first plunger disposed in a distal end of the first chamber, the first plunger including a first locking mechanism configured to prevent the first plunger from sliding away from the proximal end of the syringe body, when the first plunger is in a first initial position and the second plunger is being depressed; and a second plunger disposed in a distal end of the second chamber, the second plunger including a second locking mechanism configured to prevent the second plunger from sliding away from the proximal end of the syringe body when the second plunger is in a second initial position and the first plunger is being depressed.