Syringe Dosage Adjuster With Locking Cylinder for Stable Dose Setting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional syringe dosage adjustment structures fail to maintain the set dosage amount reliably due to unintentional changes in the stopper's mounting position, leading to incorrect medication delivery.
Innovation Solution
A dosage adjuster for a syringe featuring a dosage setting part and a setting restriction part that allows switching between restricted and permissible states, using a rotatable and slidable operation cylinder to securely set and maintain the dosage amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the stopper is made movable to adjust dosage, then the dosage can be changed according to prescription, but the mounting position of the stopper may change unintentionally when the flange is strongly pressed
Solution Approach 1:
The stopper is designed with dynamic characteristics, allowing it to move forward when the plunger is pressed to deliver the dosage. The stopper can be positioned at different locations along the plunger to achieve different dosage amounts, providing adaptability while maintaining control through the pressing action
Solution Approach 2:
A receiving part is introduced as an intermediary component between the stopper and the plunger flange. This receiving part engages with the flange during pressing operations, mediating the force transmission and preventing direct contact that could cause unintentional stopper movement. The receiving part acts as a buffer that ensures reliable dosage delivery without compromising the stopper's positional stability
2Productivity
If the stopper is pressed forward to deliver dosage, then the medication can be administered, but the stopper mounting position changes leading to incorrect dosage
Solution Approach 1:
The receiving part serves as an intermediary that engages with the plunger flange during the dosage delivery process. It controls and guides the pressing action, ensuring that the stopper moves forward in a controlled manner to deliver the precise dosage amount without unintended position changes that would compromise accuracy
3Force
If the flange is strongly pressed to ensure dosage delivery, then the medication can be administered, but the stopper position changes unintentionally
Solution Approach 1:
The receiving part acts as a mediator between the pressing force applied to the flange and the stopper. It distributes and controls the force transmission, allowing sufficient pressing force to be applied for reliable dosage delivery while preventing excessive force from causing unintentional stopper position changes. This intermediary component protects the setting maintenance against force-induced position shifts
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Provided is a dosage adjuster for a syringe including: a dosage setting part configured to set the amount of dosage usable out of a liquid medicine filled in the syringe; and a setting restriction part configured to switch between a restricted state in which change in setting of the amount of dosage set by the dosage setting part is restricted and a permissible state in which the change in the setting of the amount of dosage by the dosage setting part is permissible.