Automatic Injection Device Motor-Driven Puncture Control
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Solution Overview
Problem
Current automatic injection devices cause pain and anxiety due to high-speed puncture by spring force, making it difficult to set precise conditions for puncture speed, depth, and infusion rate, and do not alleviate pain effectively during drug administration.
Innovation Solution
An automatic injection device with a first drive unit using a motor and motion converter for controlled puncture and a second drive unit for infusion, allowing adjustable puncture speed, depth, and infusion rate, and featuring a syringe holder and control unit for precise control of the syringe needle and plunger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If spring force is used to automatically press the syringe and pusher for high-speed puncture, then automatic injection is achieved, but pain and anxiety increase due to high-speed puncture
Solution Approach 1:
The drive mechanism is divided into two independent units: a first drive unit for puncture and a second drive unit for infusion. This segmentation allows each unit to be optimized for its specific function, with the first drive unit controlling puncture speed to minimize pain while the second drive unit handles infusion separately.
Solution Approach 2:
The traditional spring-based mechanical drive system is replaced with motor-driven systems. The first drive unit uses a motor and motion converter to provide controlled, adjustable-speed puncture, eliminating the uncontrolled high-speed puncture caused by spring force that causes pain and anxiety.
2Extent of automation
If spring force drives both puncture and infusion, then automatic injection is achieved, but precise control of puncture speed, depth, and infusion rate becomes difficult
Solution Approach 1:
The drive system is segmented into two independent drive units, each with its own control mechanisms. The first drive unit controls puncture parameters (speed, depth) while the second drive unit controls infusion rate, allowing precise independent adjustment of each parameter without interference from the other function.
Solution Approach 2:
The system incorporates adjustable and variable parameters through motor control. The motion converter in the first drive unit enables variable puncture speed, and the second drive unit enables adjustable infusion rates, providing dynamic control precision that a fixed spring system cannot achieve.
3Productivity
If high-speed puncture is performed to quickly complete injection, then productivity is improved, but pain and patient discomfort increase
Solution Approach 1:
The first drive unit employs a motor with motion converter that enables variable speed control during puncture. The system can optimize puncture speed based on patient needs and needle characteristics, achieving adequate injection productivity while maintaining speeds that minimize pain and discomfort, unlike fixed high-speed spring-driven systems.
Data Source
AI summary
A method for measuring an amount of pain involves positioning a needle adjacent a non-human animal which is under anesthesia, inserting the needle at a controlled puncture speed into skin of the non-human animal, and measuring a muscle action potential of a muscle portion of the non-human animal produced by the insertion of the needle. The muscle action potential is measured from insertion start, at which the insertion of the needle into the skin is started, to insertion stop, at which the insertion of the needle into the skin is stopped.