Angled Injection Button Mechanism for Stable Medical Administration
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Solution Overview
Problem
Conventional medical administration instruments for self-administration of insulin or hormone preparations face issues such as unstable administration states, increased pain due to deeper needle insertion, potential for needle insertion beyond intended depth, leakage or back-flow of drug solutions, and forgetfulness of air removal, leading to hazardous conditions.
Innovation Solution
The administration instrument features a non-parallel force transmission mechanism for the injection button, a skin touch portion with adjustable position and area, and an air removal announcement system, along with a needle attachment detection unit to prevent operation without the needle, ensuring stable and safe administration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the injection button is pressed in the same direction as needle insertion, then the administration operation is simple, but the needle is inserted deeper into the skin increasing pain and instability
Solution Approach 1:
The patent changes the direction of force application from parallel to perpendicular. The injection button is pressed perpendicular to the needle insertion direction, and the plunger is driven to move parallel to the needle through a gear mechanism. This dimensional change eliminates deeper needle insertion while maintaining effective drug delivery.
Solution Approach 2:
The patent introduces a gear mechanism as an intermediary between the injection button and the plunger. The gear converts the perpendicular pressing motion into parallel plunger movement, acting as a mediator that transforms the direction of force while maintaining the functional relationship between the button and plunger.
2Productivity
If the needle is attached immediately before administration, then the device is ready for use, but air removal may be forgotten leading to hazardous conditions
Solution Approach 1:
The patent performs air removal automatically during the needle attachment process itself. As the needle is being attached to the cartridge, the plunger automatically pushes out air bubbles through the needle. This preliminary action ensures air removal is completed before administration begins, eliminating the risk of forgotten air removal.
Solution Approach 2:
The system performs air removal automatically without requiring separate manual intervention. The mechanical coupling between needle attachment and plunger movement causes the air removal to happen self-service style during the normal attachment operation, reducing cognitive burden on the user.
3Ease of operation
If the injection button can be pressed without needle attachment, then the device is easy to operate, but drug solution leakage or back-flow may occur
Solution Approach 1:
The patent implements a mechanical interlock that prevents the injection button from being pressed unless the needle is properly attached to the cartridge. The plunger movement is mechanically coupled to the needle attachment state, creating a preliminary barrier that blocks harmful action (button pressing without needle attachment) before it can occur.
4Adaptability or versatility
If different needle types with varying lengths are used, then the device is versatile, but the needle insertion depth becomes unstable
Solution Approach 1:
By changing the force application direction to perpendicular, the patent eliminates the correlation between needle length and insertion depth variability. The perpendicular pressing mechanism drives the plunger in a controlled manner independent of needle length, stabilizing the effective insertion depth while maintaining compatibility with different needle types.
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 deeper needle insertion, stabilizes the administration process, reduces pain, prevents drug solution leakage, and ensures proper air removal awareness, thereby enhancing safety and reliability of self-administration.
Implementation Method 1
a depressing force transmission unit for transmitting an injection button depressing force to a plunger of a drug solution cartridge that contains the injection at an angle that is not parallel to a longitudinal direction of a needle
Data Source
AI summary
An administration instrument for medical use performs injection of a drug solution with stability and with great reliability. The administration instrument includes a needle that does not wobble, thereby alleviating physical and mental pain of the administration patient. The structure includes an injection button that is pressed at an angle that is not parallel to the needle with respect to a direction in which the needle is inserted into the skin. Thus, it is possible to prevent the force of pressing the injection button from being transmitted in a direction of insertion of the needle so that the needle is inserted deeper into the skin than the initial insertion of the needle, thereby achieving administration under a stable state.