Needleless Injection Device With Dual-Slider Recoil Cancellation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Needleless injection devices experience recoil momentum during the injection process, causing discomfort to the subject and others due to the transmission of kinetic energy.
Innovation Solution
A needleless injection device with a housing, first and second sliders, and a driving unit that controls the movement of the sliders to achieve a combined momentum of zero, using mechanisms such as momentum springs, electromagnets, voice coils, and hydraulic systems to counteract kinetic energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a single slider is used to drive the piston at high speed, then high injection pressure is achieved, but severe recoil motion and vibration occur causing discomfort
Solution Approach 1:
The single slider is divided into two separate sliders (first slider and second slider) that move in opposite directions. Each slider has reduced mass compared to the original single slider, and their momentum vectors are designed to cancel each other out, eliminating recoil while maintaining the necessary injection pressure through coordinated action on the piston.
Solution Approach 2:
The second slider acts as a counterweight to the first slider, with its motion specifically designed to generate momentum that opposes and cancels the momentum of the first slider. This counterbalancing approach eliminates the net recoil momentum that would otherwise be transmitted to the device and cause vibration and discomfort.
2Object-affected harmful factors
If slider mass is reduced to minimize recoil, then recoil momentum decreases, but kinetic energy available for high-pressure injection is reduced
Solution Approach 1:
The kinetic energy contributions of both sliders are combined through their coordinated motion. While each individual slider has reduced mass, the total kinetic energy delivered to the piston is the sum of both sliders' contributions, maintaining sufficient power for high-pressure injection while eliminating recoil through momentum cancellation.
Solution Approach 2:
The two sliders operate in a coordinated periodic manner, with their motions synchronized to achieve momentum cancellation at the appropriate moments while delivering cumulative kinetic energy to the piston during the injection phase, thereby maintaining injection power without generating harmful recoil.
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 minimizes recoil momentum, reducing discomfort to the subject and others by ensuring the combined momentum of the sliders is substantially zero, allowing for controlled and efficient liquid injection.
Implementation Method 1
a momentum spring between the first slider and the second slider
Implementation Method 2
a rotatable shaft comprising a curved surface comprising a symmetric groove, wherein the symmetric groove is configured to engage with the first and second rod, thereby moving the first and second rod along the axis when the rotatable shaft is rotated
Implementation Method 3
a gear motor configured to rotate the rotatable shaft
Implementation Method 4
the rotatable shaft further comprises sound-absorbing materials near the first nadir and the second nadir
Implementation Method 5
using mechanisms such as momentum springs, electromagnets, voice coils, and hydraulic systems to counteract kinetic energy
Implementation Method 6
using mechanisms such as momentum springs, electromagnets, voice coils, and hydraulic systems to counteract kinetic energy
Data Source
AI summary
The present disclosure provides a needleless injection device and methods to use the same. The needleless injection device comprises a first slider, a second slider, a driving unit to move the first and second sliders, and an ampoule injection tube. The driving unit controls the movement of the first and second sliders such that the value of the combined momentum of the first and second sliders is substantially zero, and the movement of the first and second slider injects the liquid from the ampoule injection tube into a subject.