Multi-Reservoir Injection Pump With Single Rotary Selection
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Solution Overview
Problem
Existing fluid injection devices face challenges with large volumes, high viscosities, bulkiness, contamination risks, complexity, and disposal issues, particularly when handling multiple fluids.
Innovation Solution
A compact fluid injection device with a single rotary actuator that selects reservoirs and actuates a peristaltic pump, using a central pin and rotary selector member to manage fluid flow, with reusable electronic modules and minimal material contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If injectors are designed to dispense large volumes or viscous fluids, then dispensing capability is improved, but device size and weight increase making it bulky
Solution Approach 1:
The device is divided into a reusable electronic module and a disposable module containing reservoirs and peristaltic pump. This segmentation allows the heavy disposable components to be replaced after use, reducing overall device weight for subsequent treatments while maintaining high-volume viscous fluid dispensing capability in the disposable module.
Solution Approach 2:
The peristaltic pump uses a flexible roller that dynamically compresses the tubing to propel viscous fluids. This dynamic compression mechanism enables effective dispensing of high-viscosity fluids without requiring heavy-duty static pumping components, thus maintaining compact device weight.
2Adaptability or versatility
If multiple reservoirs are included to dispense multiple fluids, then treatment versatility is improved, but device complexity and material contact points increase raising contamination risk
Solution Approach 1:
The complex multi-reservoir selection mechanism and peristaltic pump are extracted into a disposable module that is discarded after single use. This eliminates the contamination risk from repeated use while maintaining the versatility of multiple reservoirs for different fluids in each disposable module.
Solution Approach 2:
The entire disposable module containing multiple reservoirs, tubing, and pump is designed as a single-use component. This disposable approach eliminates contamination risks from material contact across multiple uses while maintaining multi-fluid versatility within each module, and reduces device complexity for the reusable portion.
3Reliability
If a complete device is disposed of after use, then contamination risk is reduced, but manufacturing cost and waste increase
Solution Approach 1:
The device is segmented into reusable electronic module and disposable module. The expensive electronic components are reused across multiple treatments, reducing per-unit manufacturing cost and waste, while the disposable module maintains contamination prevention by being discarded after single use.
Solution Approach 2:
The disposable module is discarded after use while the electronic module is recovered and reused. This approach prevents contamination by discarding the portion that contacts fluids, while recovering expensive electronic components to reduce overall manufacturing cost and environmental waste.
4Ease of operation
If fluid contacts numerous materials between reservoir and needle, then device functionality is improved, but contamination risk increases
Solution Approach 1:
All components that contact fluid (reservoirs, tubing, peristaltic pump roller) are integrated into a disposable module that is discarded after single use. This eliminates contamination risk from material contact while maintaining full fluid delivery functionality within the disposable module.
Solution Approach 2:
The fluid-contacting components are extracted into a separate disposable module that does not contact the reusable electronic module. This extraction maintains necessary fluid delivery functionality through dedicated tubing and pump mechanisms while eliminating cross-contamination risk between uses.
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
Enables efficient dispensing of large volumes and viscous fluids with reduced bulk, lower material contact, simplicity, and cost-effectiveness, allowing reuse and recycling of components.
Implementation Method 1
an injection needle for penetrating into said injection site so as to inject therein the contents of one or more reservoir(s); said device further comprising a single rotary actuator that, when it turns in a first direction of rotation, activates the selection of the reservoir(s) to be dispensed, and that, when it turns in the opposite direction, actuates a dispenser system, in particular a peristaltic pump
Data Source
AI summary
A fluid injection device having a body for coming into contact with an injection site (SI); at least two fluid reservoirs (210); and an injection needle (120) for penetrating into the injection site (SI) so as to inject therein the contents of one or more reservoir(s) (210); the device further has a single rotary actuator (130) that, when it turns in a first direction of rotation, activates the selection of the reservoir(s) (210) to be dispensed, and that, when it turns in the opposite direction, actuates a dispenser system, in particular a peristaltic pump (150).