Medicine Injection Device Cartridge Driving Module Segmentation
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Solution Overview
Problem
Conventional medicine injection devices face issues with locking due to over-engagement during operation and difficulty in replacing medicine cartridges, which can lead to reduced lifespan and increased maintenance challenges.
Innovation Solution
A cartridge driving module with a motor, shaft, power transmission, pusher, and position maintaining unit, featuring threaded engagement and an elastic member, allows for secure pressure application to the medicine cartridge and easy return to a preset position for cartridge replacement, preventing locking and facilitating prolonged device lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the shaft and power transmission are screwed with each other to apply pressure to the medicine cartridge, then the pressure application is secure, but locking may occur due to over-engagement
Solution Approach 1:
The shaft is divided into two portions: a first portion with a circular cross section and a second portion with a threaded outer surface. The power transmission includes a first insertion portion with a threaded inner surface and a second insertion portion with a larger cross section. This segmentation allows the threaded engagement to occur only in the first portion, preventing over-engagement and locking while maintaining secure pressure application.
Solution Approach 2:
The threaded structure is applied locally only to the first portion of the shaft and the corresponding first insertion portion of the power transmission, rather than along the entire length. This localized threading ensures that the screw engagement provides sufficient pressure application strength without extending too far and causing locking issues.
2Ease of operation
If the power transmission moves back to its initial position for cartridge replacement, then the cartridge can be replaced easily, but the threaded engagement may cause difficulty in returning to preset position
Solution Approach 1:
The power transmission is segmented into a first insertion portion (threaded) and a second insertion portion (larger cross section, non-threaded). When the power transmission moves back, the second portion engages with the second insertion portion of the shaft, providing a smooth, non-threaded path that facilitates easy return to the initial position without the resistance of threaded engagement.
Solution Approach 2:
The system transitions between two dynamic states: during forward movement, the threaded engagement provides controlled pressure application; during backward movement, the non-threaded engagement allows free return to the initial position. This dynamic switching between engaged and disengaged states simplifies the cartridge replacement operation.
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 solution prevents locking due to inter-thread engagement, making it easier to replace medicine cartridges and prolonging the device's lifespan by ensuring secure and efficient operation.
Implementation Method 1
the elastic member wound around the first portion of the shaft and compressed by the power transmission to exert an elastic force to the power transmission
Implementation Method 2
A first thread may be formed on an outer surface of the shaft. The power transmission may include an insertion hole through which the shaft may be inserted. A second thread may be formed on an inner circumferential surface of the insertion hole. The first thread may be engaged with the second thread.
Data Source
AI summary
According to an embodiment, a cartridge driving module comprises a motor and a shaft extending along a rotational axis of the motor, a power transmission screwed to the shaft and moving forward when the shaft rotates in a forward direction and moving back when the shaft rotates in a backward direction, a pusher connected to the power transmission and exerting a pressure to a medicine cartridge containing a medicine when the power transmission moves forward, and a position maintaining unit exerting an external force to the power transmission in a direction along which the power transmission moves forward, when the power transmission moves back up to a predetermined stop position.