Fixed-Quantity Liquid Medicine Injection Device with Ratchet Mechanism
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Solution Overview
Problem
Existing methods for delivering medicine to the skin surface, such as short needle penetration, are inconvenient and do not effectively address the need for efficient and easy self-administration, particularly for large areas like the face.
Innovation Solution
A device with a fixed-quantity moving module that includes a cap, pushing blocks, ratchet gears, and springs, allowing for a single-handed operation to inject a precise amount of liquid medicine by moving a piston in a syringe, enabling efficient delivery to various skin areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a needle of short length is used to penetrate into the skin tissue and deliver medicine, then the absorption rate is improved, but the convenience for self-injection is worsened
Solution Approach 1:
The device is divided into multiple functional modules: a syringe module for medicine delivery, a pushing module with ratchet mechanism for controlled piston movement, and a housing system for structural support. This segmentation allows each module to perform its specific function efficiently while maintaining overall system convenience for self-injection
Solution Approach 2:
The ratchet mechanism enables the pushing block to automatically advance the piston in fixed increments with each cap depression, without requiring manual manipulation of the piston or needle. The mechanism self-regulates the injection process, making it convenient for non-medical personnel to perform self-injection while ensuring reliable medicine delivery
2Manufacturing precision
If a device with ratchet gear and multiple pushing blocks is used to achieve fixed quantity injection, then the manufacturing precision is improved, but the device complexity is worsened
Solution Approach 1:
The device employs a dynamic ratchet mechanism where the pushing block can move freely in the downward direction but is prevented from moving upward by the ratchet teeth. This dynamic constraint system allows the piston to advance in precise fixed increments with each cap depression, ensuring accurate dosage control while maintaining relatively simple structural components that are easy to manufacture
Solution Approach 2:
The ratchet gear acts as an intermediary mechanism between the user's simple cap-depression action and the piston's precise linear movement. It translates the reciprocating motion of the cap into unidirectional, quantized piston advancement, achieving fixed quantity injection without requiring complex control systems or multiple sophisticated components
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 allows for convenient and efficient delivery of a fixed quantity of medicine with one-handed operation, maximizing user convenience and medicine delivery efficiency, even for non-medical staff outside a hospital setting.
Implementation Method 1
a first spring provided between the cap and the first pushing block
Implementation Method 2
a second spring provided between the first pushing block and the second pushing block
Implementation Method 3
The pushing bar may include a linear ratchet gear which is longitudinally formed on a side surface of the pushing bar, the first pushing block may include a first pawl engaging with the ratchet gear, and the linear ratchet gear and the first pawl may be configured to move the pushing bar downwards and limit an upward movement thereof
Data Source
AI summary
Provided is a device for injecting a fixed quantity of liquid medicine, to which a syringe may be mounted and which may inject the liquid medicine held in the syringe by a fixed quantity due to a user's pushing operation. The device for injecting the fixed quantity of liquid medicine is advantageous in that a user can operate the device with one hand to inject the fixed quantity of medicine into various areas, thus maximizing operability and convenience. Furthermore, the device is advantageous in that it is possible to maximize medicine delivery efficiency even when operated by a person who is not a medical staff not in a hospital but at home.