Injection Pen Cap Removal Using a Slidable Needle Shield Actuator
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Solution Overview
Problem
Existing injection devices require a pulling motion to remove the cap, which can be difficult for elderly or infirm users, and there is a need for a more accessible and controlled mechanism to ensure the needle shield is securely attached during transport and use.
Innovation Solution
An injection device with a slidable actuator that facilitates the removal of the needle shield by sliding motion, allowing for easier and controlled separation of the cap from the body, featuring a grip portion and elongate member to assist in the sliding mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cap is held onto the body with sufficient force to prevent accidental removal, then the needle is kept sterile and injury is prevented, but the pulling motion required to remove the cap becomes difficult for elderly or infirm patients
Solution Approach 1:
The patent introduces an actuator as an intermediary component between the user and the cap. The actuator includes a projection that engages with a recess in the cap, allowing the user to apply force to the actuator which then transmits this force to remove the cap. This intermediary mechanism amplifies the user's input force and provides a mechanical advantage, making cap removal easier for elderly or infirm patients while maintaining secure attachment during storage and transport.
2Stability of the object's composition
If the cap is securely attached to the body, then the needle shield remains in place during transport and storage, but the cap becomes difficult to remove when needed
Solution Approach 1:
The patent segments the cap removal function into two distinct parts: the cap itself which remains securely attached to the body, and the actuator which is separately engaged with the cap. The actuator includes a projection that fits into a recess in the cap, creating a detachable connection. This segmentation allows the cap to maintain stable attachment during transport while enabling easy removal through the actuator mechanism when needed.
Solution Approach 2:
The patent implements a dynamic system where the actuator can be moved relative to the body to engage and disengage from the cap. The actuator includes a projection that can be inserted into and removed from a recess in the cap. This dynamic engagement mechanism allows the system to transition between a stable state (cap attached) and a removable state (cap detached), providing both security during transport and ease of removal when needed.
Data Source
Figure 1A~1B
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AI summary
The present invention relates to an injection device. The injection device comprises a cap and a body for holding a syringe that has a needle at one end. The cap is removably attached to the body and has a needle shield to receive said needle. The injection device further comprises an actuator that is slidable relative to the body in the longitudinal direction of the body to urge the needle shield away from the body.