Needleless Injection Device Pneumatic Actuation Noise Reduction
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Solution Overview
Problem
Conventional needleless pain-free injection devices face challenges in providing sufficient pressing force for rapid drug injection while minimizing noise, especially for sensitive subjects like infants and animals, as they often generate excessive noise or require inconvenient operation.
Innovation Solution
A needleless pain-free injection device featuring a valve body with a valve member and a liquefied gas container, where pneumatic pressure is used to drive a piston member through a gas passage forming mechanism, reducing noise and enhancing operational convenience by integrating a housing and utilizing a gas passage forming means to control communication between internal spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If pneumatic pressure is used to drive instantaneous injection, then injection speed is improved, but noise level increases
Solution Approach 1:
The injection process is divided into two distinct phases: a loading phase where the spring is compressed slowly without noise, and an injection phase where the spring is released to drive rapid injection. This segmentation allows the system to achieve high injection speed while avoiding noise generation during the compression stage, as the loading and injection operations occur at different times.
Solution Approach 2:
The device employs periodic action by separating the compression stroke (loading) from the injection stroke. The spring is compressed during a loading period, then released during an injection period. This periodic operation allows the system to accumulate energy quietly during loading and then release it rapidly during injection, achieving high speed without continuous noise.
2Speed
If spring elasticity is used to drive instantaneous injection, then injection speed is improved, but device complexity increases due to separate loading jig
Solution Approach 1:
The loading jig is merged with the syringe body, forming an integrated structure where the compression chamber and injection chamber are combined. This eliminates the need for separate loading and injection devices, reducing overall device complexity while maintaining the ability to achieve instantaneous injection through spring elasticity.
Solution Approach 2:
The syringe body is designed to perform multiple functions: it serves as both the compression chamber for loading the spring and the injection chamber for delivering the medication. The piston and spring mechanism are integrated into a single device that can both compress and inject, eliminating the need for separate specialized tools.
3Ease of operation
If compressed gas extrusion is used to drive injection, then ease of operation is improved, but noise level increases due to gas extrusion
Solution Approach 1:
The device uses pneumatic principles by employing a spring-loaded mechanism that stores mechanical energy during loading and releases it during injection. The spring acts as a pneumatic driver, providing the force needed for instantaneous injection without requiring external compressed gas sources that would generate noise during extrusion.
Solution Approach 2:
The spring is pre-compressed during a loading phase before the actual injection occurs. This preliminary action stores the necessary energy quietly, and then the stored energy is released during the injection phase to drive the piston rapidly. This separates the energy storage (quiet) from the energy release (fast but brief) phases.
4Force
If thick needle is used for injection, then injection force is improved, but pain level increases
Solution Approach 1:
The device replaces the traditional needle-mechanism with a needleless injection system that uses pneumatic pressure from a compressed spring to propel the medication through a small aperture. This substitution eliminates the mechanical penetration of a thick needle while maintaining sufficient injection force through the spring-driven pneumatic system.
Solution Approach 2:
The injection system changes the parameter of needle diameter to a very small aperture (about 0.1 mm) while compensating for the reduced cross-sectional area by increasing the velocity and pressure of the medication flow. The spring-loaded mechanism generates high-speed jet flow that can penetrate skin through a tiny opening without the pain associated with thick needle insertion.
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 effectively provides a sufficient pressing force for rapid injection while significantly reducing noise, making it suitable for sensitive subjects and improving usability in various medical and skin care applications.
Implementation Method 1
a liquefied gas container (300) detachably coupled to one end of the valve body (100) and configured to communicate with the internal space (101) of the valve body (100), with a nozzle part open, the nozzle part being formed at the other end of the liquefied gas container (300)
Implementation Method 2
a gas passage forming means for selectively establishing and blocking communication of the internal space (101) of the valve body (100) and the internal space (401) of the cylinder body (400) with outside
Implementation Method 3
the piston member moves forward and backward according to the filling of the internal spaces with gas discharged from the liquefied gas container (300)
Data Source
AI summary
A needleless pain-free injection device according to the present disclosure includes a valve body, a valve member provided in an internal space of the valve body and airtightly sliding along the valve body, a liquefied gas container communicating with the internal space of the valve body and detachably coupled, at one end thereof, to the valve body, an operating knob provided on the exposed end of the valve member, a cylinder body coupled to one side of the valve body and having an internal space, a piston member provided such that one end thereof slides in the internal space of the cylinder body and having a piston rod, an injection unit provided with an injection piston rod coupled to the piston rod, and a gas passage forming means for selectively establishing and blocking the communication of the valve body and the cylinder body with outside air.