Adjustable Plunger Dose Stop for Syringe
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Solution Overview
Problem
Users of existing syringes face difficulties in accurately measuring and drawing medication doses due to the need for continuous visual monitoring of scale markings, which can lead to errors in dosing.
Innovation Solution
An adjustable plunger dose stop mechanism is integrated into the syringe, allowing users to set a desired dose before drawing medication, with a mechanical stop limiting the plunger travel to ensure accurate dosing without relying on visual measurement of scale markings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If scale markings are used on the syringe for measuring dosage, then the syringe can measure the liquid medication volume, but the user must continuously visually monitor the scale markings which increases the complexity of operation and reduces dosing accuracy
Solution Approach 1:
The patent replaces the visual measurement system (scale markings requiring optical detection by the user) with a mechanical stop system. The collar with adjustable stop provides a tactile mechanical limit that physically prevents the plunger from moving beyond the desired dosage position, eliminating the need for continuous visual monitoring while maintaining measurement accuracy.
Solution Approach 2:
The collar acts as an intermediary mechanism between the user's dosage selection and the plunger movement. By adjusting the collar position, the user sets a mechanical boundary that automatically controls the plunger travel distance, serving as a mediator that translates rotational collar adjustment into linear plunger displacement limits without requiring direct visual measurement.
2Measurement precision
If the syringe includes scale markings for dose measurement, then dosage can be determined, but the scale markings are difficult to read which reduces measurement precision
Solution Approach 1:
The patent eliminates the problematic scale markings entirely and replaces them with a mechanical stop system. The collar provides a physical, tactile reference point that is easily detectable without visual acuity issues, replacing the optical measurement system with a mechanical one that is independent of reading difficulties.
3Measurement precision
If the syringe uses traditional scale markings, then the dosage can be measured, but the overall syringe length increases which affects the compactness of the device
Solution Approach 1:
The collar serves multiple functions: it provides the mechanical stop for dosage limiting, acts as an adjustable positioning mechanism, and eliminates the need for extensive scale markings. This multi-functionality allows the syringe to maintain dosage measurement capability while reducing overall length by removing the need for long-scale markings along the barrel.
Data Source
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AI summary
A syringe includes a body for receiving a liquid medicament and a collar rotatably disposed in or on the body. The collar is rotatable to set a desired dose. A plunger is movably disposed in the collar. The plunger is movable to draw in and dispense the liquid medicament. An end of the collar limits movement of the plunger such that an accurate dose is drawn.