Needleless Injector Wand Assembly for Confined Space Delivery
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Solution Overview
Problem
Existing needleless injectors are bulky and not suitable for use in confined areas, such as the mouth during dental procedures, and their large size can be intimidating for patients receiving injections in sensitive areas like the face or neck.
Innovation Solution
A compact needleless injector wand assembly with a tubular design, featuring a removable nozzle holder, a pneumatic control system, and a magnet assembly that allows for efficient and precise liquid delivery through a small orifice, enabling operation in confined spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a traditional pistol-shaped needleless injector is used, then injection function is achieved, but the device is bulky and not suitable for confined areas
Solution Approach 1:
The device is divided into a handheld wand portion and a separate fluid reservoir portion. The wand contains only the essential injection components (nozzle, valve, actuator) while the fluid reservoir is a separate component that can be attached or detached, allowing the operator to use only the compact wand portion in confined spaces like the oral cavity.
Solution Approach 2:
The fluid reservoir is positioned along the longitudinal axis of the wand rather than perpendicular to it, creating a linear, elongated configuration. This dimensional arrangement reduces the overall footprint and cross-sectional dimensions of the device, making it suitable for use in confined areas while maintaining adequate fluid capacity.
2Object-affected harmful factors
If a large pistol-shaped injector is used, then injection capability is provided, but it is intimidating for patients in sensitive areas
Solution Approach 1:
By separating the fluid reservoir from the injection wand, the intimidating pistol-shaped bulk is eliminated. The wand portion that contacts the patient is small and minimally invasive, while the larger fluid reservoir remains separate, reducing the psychological impact on patients receiving injections in sensitive areas.
3Ease of operation
If a compact wand design is used, then operability in confined spaces is improved, but device complexity increases
Solution Approach 1:
Multiple functions are integrated into the wand assembly: the valve mechanism, nozzle, actuator, and fluid delivery pathway are combined in a single compact unit. This merging of functions reduces the number of separate components the operator must handle, simplifying operation despite the sophisticated internal design.
Solution Approach 2:
The valve actuation mechanism uses a simple push-button actuator that triggers pneumatic or electronic valve operation, replacing complex mechanical linkages. This substitution reduces the mechanical complexity of the wand while maintaining precise control over fluid delivery.
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 compact design allows for effective and intimidating-free injections in confined areas, with the ability to deliver precise doses of medication, reducing fluid loss and facilitating easy handling and disposal of nozzles.
Implementation Method 1
a magnet assembly for retaining the piston in a rest position
Implementation Method 2
a trigger connected to a valve for admitting gas under pressure to drive the magnet assembly forwardly against the plunger
Data Source
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AI summary
A needleless injector syringe includes a tubular barrel containing a first chamber for receiving a liquid, a nozzle on a front end of the barrel, a piston which drives a plunger for discharging the liquid through the nozzle, a second chamber in which the piston slides, a third chamber in fluid communication with the second chamber for receiving gas from said second chamber during forward movement of the piston, and for carrying gas to the second chamber to cause the piston to retract, and a breach plug closing a rear end of the barrel for directing gas under pressure alternately against the rear end of the piston and to the third chamber for driving the piston between the discharge position and a retracted position.