Adhesive Passive Injector With Automatic Needle Securing
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Solution Overview
Problem
Existing injection devices face challenges with instability during translational injections, difficulty in maintaining needle stability and visibility of the plunger, and complexity in ensuring needle safety without causing patient discomfort or injury, especially for non-specialists and in self-injectors.
Innovation Solution
A passive safety injection device with adhesive means on its distal end for stabilization, allowing one-handed operation and automatic needle retraction upon withdrawal, using a simple mechanism that ensures needle safety without complex spring mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If adhesive means are added to stabilize the distal end, then stability during injection is improved, but device complexity increases
Solution Approach 1:
The device is divided into functional segments: a distal end with adhesive means for stabilization, a body housing the reservoir and needle, and a proximal end with control means. This segmentation allows the adhesive feature to be added to only the distal end without complicating the entire device structure.
Solution Approach 2:
Instead of using complex mechanical stabilization mechanisms, the patent inverts the approach by using adhesive means that passively stabilize the device through chemical bonding to the skin, eliminating the need for complex mechanical stabilization systems.
2Reliability
If automatic needle securing means are activated by adhesive withdrawal, then needle safety is improved, but device complexity increases
Solution Approach 1:
The needle securing means is pre-configured in a locked state during injection. When the adhesive is withdrawn, it automatically triggers the needle retraction and securing sequence, eliminating the need for complex active control systems while ensuring reliable needle safety.
Solution Approach 2:
The device performs needle retraction and securing automatically in response to adhesive withdrawal, making the system self-activating without requiring additional complex control mechanisms. The withdrawal action itself triggers the safety sequence.
3Ease of operation
If rotation-based injection is used, then ease of operation is improved, but visibility of plunger position deteriorates
Solution Approach 1:
The control means incorporates local visual indicators (such as windows or transparent portions) at specific locations where plunger position needs to be visible during rotation, allowing ease of rotational operation while maintaining visibility at critical points.
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 provides stable, one-handed injection with visible dosage control and automatic needle protection, reducing patient discomfort and manufacturing costs while preventing accidental needle sticks.
Implementation Method 1
the surface of the distal end (3a) of the body (3) being extended by adhesive means (27) capable of ensuring that this surface is held on the skin (4) of a patient
Data Source
AI summary
Disclosed is an injection device of the type including a cylindrical body enclosing a reservoir containing a product to be injected, which is slidably mounted in the body, which is open at one end on an injection needle and is closed at its other end by a plunger mounted movable in translation in the reservoir under the action of a plunger rod provided with a control member, the surface of the distal end of the body being coated with adhesive capable of ensuring that this surface is held on the skin of a patient. This device is characterized in that it includes a mechanism for securing the needle, the activation of which is ensured by the adhesive when a withdrawal effort is exerted on the injection device.