Needleless Injector With Replaceable Nozzle And Stroke Adjuster
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Solution Overview
Problem
Existing needleless injectors lack the ability to easily adjust dosages and ensure nozzle replacement to prevent cross-contamination during mass injections, with existing solutions not providing a simple and effective mechanism for changing dosages or indicating used nozzles.
Innovation Solution
A needleless injector design featuring a barrel with a removable nozzle and plunger system, allowing for quick dosage adjustments via a stroke adjuster and incorporating a disposable nozzle with a resilient detent for audible indication of use, ensuring easy replacement and preventing cross-contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed nozzle is used in the injector, then the structure is simpler, but the nozzle cannot be easily replaced to prevent cross-contamination
Solution Approach 1:
The injector is divided into separable components: a reusable barrel assembly and a disposable nozzle assembly. The nozzle can be easily detached and replaced by removing it from the barrel, allowing prevention of cross-contamination without requiring complex replacement mechanisms. The nozzle includes a mounting portion that fits into the barrel with simple engagement features.
2Adaptability or versatility
If a single injector is used for multiple dosages, then the device is more versatile, but the dosage cannot be easily adjusted
Solution Approach 1:
The injector provides adjustable dosage capability through a stroke adjuster mechanism that allows the plunger stroke length to be varied. The stroke adjuster includes a movable component that can be positioned at different locations along the barrel, changing the distance the plunger travels and thus the dosage delivered. This dynamic adjustment feature allows a single injector to handle multiple dosages without requiring multiple specialized devices.
3Loss of information
If no indication mechanism is provided, then the device is simpler, but there is no way to indicate whether a nozzle has been used
Solution Approach 1:
The disposable nozzle includes a visual indicator feature such as a colored band or marker that changes appearance or position to indicate whether the nozzle has been used. Alternatively, the nozzle may include a mechanical indicator such as a tab or feature that is displaced or broken during use, providing clear visual feedback. This simple indication mechanism prevents loss of information about nozzle usage status without adding significant complexity to the device.
4Reliability
If a complex nozzle replacement system is used, then nozzle replacement is more reliable, but the replacement process is slower
Solution Approach 1:
The disposable nozzle is pre-assembled with its mounting portion and sealing elements in the correct configuration before use. This preliminary preparation allows the nozzle to be quickly attached to the barrel by simply aligning and engaging the pre-formed mounting features, eliminating the need for complex assembly operations during the replacement process. The pre-assembled design ensures reliable sealing and connection while maintaining fast replacement speed.
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 quick and efficient multiple injections with easy dosage adjustments and ensures nozzle replacement, preventing cross-contamination by providing a mechanism for audible indication of used nozzles, thus enhancing the safety and efficiency of the injection process.
Implementation Method 1
a resilient detent extending outwardly from an inner wall of said annular recess for extending into a notch in a front end of the holder sleeve when the nozzle is mounted on the holder
Implementation Method 2
a first valve for introducing fluid under pressure into said barrel alternately on one side of said piston to move the piston and plunger from the retracted to the extended position to discharge liquid through said holder and nozzle
Data Source
Figure 1~2
Figure 3~4
Figure 5~7
AI summary
A pistol-shaped needleless injector includes a readily replaceable barrel (36) in the front end thereof facilitating adjustment of the dosage administered using the injector. A disposable nozzle (98) mountable on a holder (97) extending outwardly from the front discharge end of the barrel (36) provides an indication that the nozzle (98) has been used and should be discarded.