Medical Dosing Device with Spring-Loaded Force Control
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Solution Overview
Problem
Existing administration devices for intradermal and subcutaneous injections face challenges in maintaining a consistent needle insertion depth due to variations in operator pressing force, leading to inconsistent delivery of liquid medicine.
Innovation Solution
An administration device with a cartridge and needle assembly that includes a pressing force control member, such as a spring, to generate a reaction force and maintain a constant pressing force against the skin, ensuring consistent needle insertion depth during both insertion and medication delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a cylindrical or dome-shaped structure is added near the needle point to stabilize skin thickness, then skin thickness stability is improved, but needle insertion depth consistency deteriorates due to variations in operator pressing force
Solution Approach 1:
The patent changes the physical state of the pressing force control member from a rigid structure to an elastic member (spring) that can dynamically adjust its force output. This allows the system to compensate for variations in operator pressing force by utilizing the spring's elastic properties, thereby maintaining consistent needle insertion depth despite external force variations.
Solution Approach 2:
The pressing force control member acts as an intermediary between the operator's pressing force and the needle insertion mechanism. The spring absorbs and regulates the force transmission, converting variable operator input into consistent insertion depth through its elastic deformation characteristics.
2Ease of operation
If the case is pressed against the skin with varying force by the operator, then the device is easier to operate, but the needle insertion depth becomes inconsistent
Solution Approach 1:
The spring serves as a cushioning element that anticipates and absorbs force variations before they reach the needle insertion mechanism. By positioning the elastic member in the force transmission path beforehand, the system pre-compensates for operator force variations, ensuring consistent insertion depth regardless of pressing force magnitude.
Solution Approach 2:
The patent introduces dynamic characteristics to the force transmission system through the spring's elastic deformation. Instead of a rigid, static force transmission path, the system now adapts dynamically to varying operator inputs, automatically adjusting the force applied to the needle based on the spring's compression state.
3Reliability
If the needle and cartridge are integrated after use, then accidental needle reuse is prevented, but device complexity increases
Solution Approach 1:
The patent merges the needle and cartridge into a single integrated unit after use, eliminating the need for separate disposal procedures. This combining of components ensures that the needle cannot be reused independently from the cartridge, thereby preventing accidental reuse while maintaining relatively simple implementation through mechanical coupling.
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 device ensures a consistent needle insertion depth and prevents accidental needle reuse by integrating the needle and cartridge after use, providing a notification mechanism for completion of administration.
Implementation Method 1
a pressing force control member which intervenes between the cartridge and the case so as to generate a reaction force and controls a pressing force of the case against the skin
Data Source
AI summary
An administration device including a needle; a cartridge which is capable of storing a liquid medicine to be administered into a living body by the needle; a case which has an open or openable first end to be pressed against the skin, and in which the needle and the cartridge are stored in such a manner as to be movable toward the first end side, the needle being capable of moving to the outside of the first end in response to the movement of the needle toward the first end ide; and a pressing force control member which intervenes so as to generate a reactive force between the cartridge and the case and which controls a pressing force exerted on the skin by the case while the needle moves toward the first end side. In the process of piercing by the needle, a reactive force is continuously generated by the pressing force control member and the pressing force exerted on the skin by the case is controlled at a substantially constant level, whereby the piercing depth by the needle is kept substantially constant at the time of completion of the piercing by the needle; and in the process of discharging the liquid medicine stored in the cartridge through the needle for administration, the reactive force by the pressing force control member is generated continuously, whereby the piercing depth by the needle is kept substantially constant.