Motor-Driven Ramp Syringe for Needle-Free Intramuscular Injection
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Solution Overview
Problem
Existing fluid administration devices are cumbersome and not designed for needle-free intramuscular injection, making them difficult to carry and use for extended periods.
Innovation Solution
A self-filling syringe with a cylinder, piston, nonreturn valves, and a tensioning device using a motor-driven ramp and freewheel coupling to facilitate needle-free intramuscular administration, allowing for compact design and easy handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a traditional fluid administration device is designed to be lightweight for easy carrying, then portability is improved, but it becomes difficult to achieve needle-free intramuscular injection capability
Solution Approach 1:
The device is divided into distinct functional modules: a cylinder for fluid storage, a piston for fluid displacement, a tensioning device for piston actuation, and a nonreturn valve for one-way fluid flow control. This segmentation allows each component to be optimized independently, achieving needle-free injection capability while maintaining a compact, lightweight overall structure that can be carried in one hand.
Solution Approach 2:
The tensioning device pre-tensions the piston rod during the filling phase, storing mechanical energy that is subsequently released during the dispensing phase to propel the piston forward for needle-free injection. This preliminary action eliminates the need for heavy manual operation during injection, enabling lightweight design while maintaining injection capability.
2Ease of operation
If the device is designed with a tensioning device for needle-free injection, then injection capability is improved, but device complexity increases
Solution Approach 1:
The tensioning device automatically tensions the piston rod during the filling phase without requiring manual intervention. The motor-driven ramp mechanism self-regulates the piston position and tension, eliminating complex manual adjustment mechanisms and reducing overall device complexity while maintaining advanced injection capability.
Solution Approach 2:
The traditional complex mechanical injection mechanisms (needles, syringes, manual plungers) are replaced with a motor-driven tensioning device that uses electromagnetic actuation. This substitution simplifies the user interface and reduces mechanical complexity while enabling precise, needle-free intramuscular injection.
3Manufacturing precision
If nonreturn valves are used for one-way fluid flow control, then fluid administration precision is improved, but device complexity increases
Solution Approach 1:
The nonreturn valve functionality is integrated directly into the fluid path between the cylinder and the dispensing needle, eliminating the need for separate, complex valve assemblies. This merging of functions maintains precise one-way fluid control while minimizing additional components and overall device complexity.
4Ease of operation
If the device is designed for self-filling capability, then ease of use is improved, but device complexity increases
Solution Approach 1:
The device automatically fills the cylinder through the tensioning device's reverse operation, which creates negative pressure to draw fluid in through the nonreturn valve. This self-filling capability eliminates manual filling operations and complex filling mechanisms, reducing device complexity while improving ease of use.
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 lightweight, one-handed operation for extended periods with precise fluid administration, ensuring efficient filling and dispensing without needles, and includes control mechanisms for process verification.
Implementation Method 1
a nonreturn valve (which acts as an outlet valve) closing the open dispensing end
Implementation Method 2
The tensioning device can have a ramp which is rotatable by means of a motor and which has a ramp track extending along a helical line
Implementation Method 3
the coupling transmits the torque, which is provided by the motor, in the first rotation direction and, in the process, provides a freewheel counter to the first rotation direction
Data Source
AI summary
A device for administering a fluid can include a cylinder, a piston connected to a piston rod, and a tensioning device connected to the piston rod. The tensioning device includes a ramp which is rotatable via a motor, a ramp track, and a roller which is in contact with the ramp track and which is mounted rotatably in a driver. The driver can be connected to the piston rod via a joint. In a tensioning procedure, the ramp track is rotated such that the roller runs on the region of inclination as far as the second plateau and the piston is thereby moved to its rear end position. In a dispensing procedure, the ramp track is rotated until the roller runs over a transfer region and, on account of the tensioning, is accelerated toward the first plateau and, as a result, the piston is moved toward the an dispensing end.