Spring Metal Strip Injection Drive for Viscous Fluids
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Solution Overview
Problem
Existing automatic fluid product injection devices face challenges with large volumes and viscous fluids, and require complex mechanisms for multiple fluid combinations.
Innovation Solution
An automatic fluid product injection device featuring a power-supplied injection system with a spring-loaded metal strip, electric motor, and worm drive mechanism, allowing for efficient distribution of large volumes and viscosities, with reusable and disposable components for ease of manufacturing and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a traditional spring mechanism is used to drive the piston, then the device structure is simple, but it cannot handle large volumes and viscous fluids effectively
Solution Approach 1:
The patent replaces the traditional mechanical spring mechanism with an electric motor-driven system. The motor (23) unwinds a wound spring (3) to generate controlled mechanical force through a transmission mechanism, enabling precise control over injection speed and force to handle viscous fluids and large volumes effectively.
Solution Approach 2:
The patent changes the driving mechanism from a direct mechanical spring to an electrically-controlled system with variable parameters. The motor speed, winding tension, and transmission ratio can be adjusted to optimize injection parameters for different fluid viscosities and volumes, providing adaptability that a fixed mechanical spring cannot achieve.
2Adaptability or versatility
If multiple fluid products need to be combined in the same treatment, then the treatment versatility is improved, but the device complexity increases
Solution Approach 1:
The patent designs a universal injection system where a single motor (23) and control mechanism can drive multiple pistons (one per reservoir). Each reservoir can be independently controlled to inject different fluid products in sequence or simultaneously, providing multi-functionality without requiring separate injection mechanisms for each fluid product.
Solution Approach 2:
The patent segments the fluid storage into multiple independent reservoirs, each with its own piston, while using a shared drive mechanism. This segmentation allows different fluid products to be stored separately and injected in controlled sequences, maintaining versatility while reducing overall system complexity through component sharing.
3Manufacturing precision
If a reusable upper body with electric motor is used, then the injection control precision is improved, but the manufacturing cost increases
Solution Approach 1:
The patent uses a dynamic control system where the motor (23) can be activated at different stages and with different power levels to control the injection process precisely. The wound spring (3) provides progressive force as it unwinds, and the transmission mechanism translates this into controlled piston movement, achieving precision without requiring overly complex or expensive components.
Solution Approach 2:
The wound spring (3) serves dual purposes: it stores energy during the winding phase and provides the driving force during injection as it unwinds. This self-contained energy storage and release mechanism reduces the need for additional complex control systems, batteries, or high-power motors, thereby reducing manufacturing costs while maintaining control precision.
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 reliable and efficient injection of large volumes and viscous fluids, with adjustable injection speed and simultaneous or sequential distribution from multiple reservoirs, reducing manufacturing costs and simplifying device design.
Implementation Method 1
at least one elongated spring metal strip, each strip being wound onto a respective spool before actuation, and a drive mechanism for unwinding said at least one strip against a respective piston to carry out the injection
Implementation Method 2
said drive mechanism comprises an electric motor and a worm drive
Data Source
Figure 1
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AI summary
Automatic fluid product injection device comprising: – an upper body (1) comprising at least one injection system (3, 4, 5) controlled by power supply means (7) and triggered by user interface (100), such as at least one actuating button, and an insertion mechanism (8, 9) for the insertion of an injection needle (110), – a base body (2) intended to come into contact with a region that is to be injected, comprising at least one reservoir (6) of fluid product, each containing an injection piston (65) and a needle assembly (10) comprising said injection needle (110), in which said injection system comprises: – at least one elongate spring-metal strip (3), each strip being, prior to actuation, wound on to a respective reel (30), and – a drive mechanism (5) for unwinding said at least one strip (3) against a respective piston (65) in order to perform the injection, and for winding said strip (3) back up on said reel (30) after injection.