Wearable Automatic Injection Device With Spring-Driven Controlled Rate
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Solution Overview
Problem
Conventional automatic injection devices cause discomfort due to fast injection rates, leading to pain and burning sensations for patients, especially when administering large volumes or certain therapeutic agents like antibodies, and they often require aseptic assembly to maintain sterility.
Innovation Solution
A wearable automatic injection device that delivers therapeutic agents subcutaneously at slow, controlled rates without batteries, featuring a mechanical plunger actuation mechanism, a retraction trigger for automatic needle retraction, and a design that adheres to the skin or clothing, minimizing discomfort and eliminating the need for aseptic assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If conventional automatic injection devices are used to deliver therapeutic agents, then the injection can be administered automatically, but the injection rate is too fast causing pain and burning sensations
Solution Approach 1:
The device employs a spring-driven plunger mechanism with a controlled release system that dynamically adjusts the injection rate. The spring gradually propels the plunger forward, delivering the therapeutic agent at a slow, controlled rate rather than a sudden fast injection, thereby reducing pain and burning sensations while maintaining automatic delivery
Solution Approach 2:
The invention changes the key parameter of injection rate from fast to slow by modifying the mechanical delivery system. The spring-driven mechanism with controlled release alters the speed and timing of agent delivery, transforming the harmful fast injection into a tolerable slow injection while preserving automation
2Quantity of substance
If conventional automatic injection devices are used for large volume injections, then the therapeutic agent can be delivered, but the fast injection rate increases discomfort and pain
Solution Approach 1:
The spring-driven plunger mechanism is designed to gradually propel large volumes of therapeutic agent over an extended period. The controlled release system ensures that even large volumes are delivered at a slow, manageable rate, preventing the discomfort and pain associated with rapid large-volume injections
Solution Approach 2:
The device uses periodic or continuous gradual action through the spring mechanism to deliver large volumes of therapeutic agent. Rather than a single rapid injection, the spring-driven system provides sustained, controlled delivery over time, reducing discomfort while accommodating large volumes
3Productivity
If conventional automatic injection devices are used, then injection delivery can be achieved, but aseptic assembly is required to maintain sterility
Solution Approach 1:
The device is divided into sterile and non-sterile segments. The syringe, needle, and therapeutic agent container are designed as disposable sterile components that can be pre-packaged and sealed. The reusable housing and spring mechanism remain outside the sterile field, eliminating the need for aseptic assembly while maintaining injection delivery capability
Solution Approach 2:
The invention employs a disposable sterile cartridge containing the syringe, needle, and therapeutic agent. This single-use component is pre-sterilized and sealed, while the main device body is reusable. The disposable nature of the sterile components eliminates complex aseptic assembly requirements during manufacturing
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 provides a comfortable, controlled delivery of therapeutic agents, reducing pain and maintaining sterility, while being easy to use and manufacture, and can administer a therapeutically effective dose over a selected time period ranging from minutes to hours.
Implementation Method 1
a spring for propelling the plunger to eject the therapeutic agent from the vessel
Implementation Method 2
a viscous damping mechanism for regulating the movement of the spring and the plunger
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 1E~1F
AI summary
Exemplary embodiments provide wearable automatic injection devices for subcutaneously injecting a therapeutic agent into a patient's body at controlled rates, for example, in a single bolus. Exemplary embodiments provide methods for assembling wearable automatic injection devices for subcutaneously injecting a therapeutic agent into a patient's body at controlled rates. Exemplary embodiments provide methods for using wearable automatic injection devices for subcutaneously injecting a therapeutic agent into a patient's body at controlled rates.