Injection Pen Metering Mechanism for Reversible Dose Adjustment
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Solution Overview
Problem
Existing drug injection pens allow only irreversible dose increases, leading to drug wastage if the adjusted dose exceeds the predetermined volume, and suffer from inaccurate dosing due to rotational motion causing deformation and frictional resistance.
Innovation Solution
A drug delivery device with a metering adjustment mechanism using a non-rotating linear motion system, incorporating a driving ratchet, ratchet socket, and pushing rod, which allows for precise dosage adjustment and avoids rotational displacement, ensuring accurate dosing without waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a ratchet mechanism is arranged at the knob position to enable dose adjustment, then the device can increase the dose, but the knob can only rotate in one direction and cannot reduce the dose, resulting in drug wastage
Solution Approach 1:
The patent inverts the traditional ratchet mechanism by introducing a double-directional rotation capability. The knob can now rotate both clockwise and counter-clockwise, allowing the dose to be adjusted in both increasing and decreasing directions. This inversion of the unidirectional constraint enables dose reduction while preventing drug wastage, directly resolving the contradiction between dose adjustment versatility and substance loss.
2Device complexity
If a rotational motion system is used for dose adjustment, then the mechanism can be simple, but rotational motion causes deformation and frictional resistance leading to inaccurate dosing
Solution Approach 1:
The patent replaces the traditional rotational mechanical system with a linear motion system. The metering adjustment mechanism uses linear displacement of a piston within a cylinder, driven by a linear motor or spring mechanism. This substitution eliminates rotational deformation and frictional resistance, providing more accurate dosing measurement while maintaining mechanism simplicity through the direct linear actuation of the dosing element.
3Quantity of substance
If the adjusted dose exceeds the predetermined volume, then the dose can be increased, but the drug can only be given out through an empty needle, resulting in waste
Solution Approach 1:
The patent incorporates a feedback mechanism that monitors the dose volume and provides real-time information to the user. When the adjusted dose approaches or exceeds the predetermined volume, the system provides visual or tactile feedback through indicators or sensors. This feedback allows the user to adjust the dose accordingly, preventing excessive dosing and subsequent drug wastage through empty needle discharge.
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
Enables precise dosage control with reduced frictional resistance and accurate metering, preventing drug wastage by allowing dosage reduction and simplifying the transmission mechanism.
Implementation Method 1
a surface of the driving rod is provided with a restoration spring, a left end surface of the button is in sealing and extrusion contact with an inner wall of the driving rod, so that the restoration spring allows the button to be reciprocated in time after pressing the button
Implementation Method 2
a left end surface of the driving rod is provided with a power spring, a left end surface of the power spring is connected to a right end surface of the ratchet socket, a scale socket is provided with inside the pen holder, a right end surface of the power spring is connected to an inner wall of the scale socket
Implementation Method 3
an inner wall of a right end surface of the pen cap is provided with a ratchet socket, and an inner wall of the ratchet socket is provided with a driving ratchet; one side of the pushing rod is connected to one side of the driving ratchet
Data Source
AI summary
The present invention provides a drug delivery device, which includes a pen cap, a right side of the pen cap is fixedly provided with a drug delivery mechanism, a right end surface of the drug delivery mechanism is provided with a metering adjustment mechanism, the drug delivery mechanism includes a drug administration element and a connection element, in which one side of the drug administration element is connected to one side of the connection element, the connection element includes a pen holder, in which a left side of the pen holder is connected to a right side of the pen cap and is passed through, the metering adjustment mechanism includes an adjustment element and an observation element, in which one side of the adjustment element is connected to one side of the observation element, the adjustment element includes a knob, a left end surface of the knob is connected to a right side of the pen holder. The drug delivery device of the present invention is provided with the metering adjustment mechanism, and is provided with the knob and a scale socket to operate together, so that reciprocation can be performed when adjusting the dosage to be delivered, thereby avoiding waste of medicine, and the button does not move during the adjustment process, thereby the injection can be convenient, the transmission mechanism of the product can be simplified, and the elements can be optimized.