Drug Delivery Adaptor Bonding Structure for Torque and Pullout Resistance
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Solution Overview
Problem
Existing drug delivery devices face issues with adaptors that fail to provide adequate resistance to pullout force and torque, leading to potential disconnection, leakage, and safety risks during injection, especially when using viscous drugs or connectors with complex molding tools.
Innovation Solution
An adaptor with a mounting ring and annular space accommodating an adhesive layer, featuring protrusions that enhance torque and pullout resistance, allowing irreversible bonding to a regular longitudinal tip without additional attaching means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the adaptor is secured to the longitudinal tip by snap-fitting or friction force, then the device complexity is reduced, but the torque resistance and pullout resistance are insufficient
Solution Approach 1:
The patent applies preliminary action by creating an annular space between the mounting ring and the longitudinal tip before final assembly, which allows for the introduction of adhesive material that will subsequently bond the adaptor to the tip, providing enhanced torque and pullout resistance without complex attachment features
Solution Approach 2:
The patent uses adhesive as an intermediary substance between the adaptor's mounting ring and the longitudinal tip. This adhesive layer, introduced into the annular space, acts as a mediator that creates a strong bond resistant to torque and pullout forces, eliminating the need for mechanical attaching means
2Reliability
If additional attaching means are incorporated on the longitudinal tip, then the torque resistance is improved, but the manufacturing complexity increases and the tip becomes more sensitive to flaws
Solution Approach 1:
The patent extracts the attaching means from the longitudinal tip itself and relocates them to the adaptor's mounting ring. By providing the annular space and adhesive introduction features on the adaptor rather than modifying the tip, the solution avoids adding complexity to the tip manufacturing while still achieving enhanced torque resistance
Solution Approach 2:
The patent creates a simplified attachment system by copying the essential function of mechanical attaching means through an adhesive-based system. The mounting ring with its annular space design replicates the torque-resisting function of grooves or rings without requiring the complex molding tools or additional forming steps
3Reliability
If the adaptor is connected by screwing with a connector, then the connection security is improved, but significant pullout force and torque are applied that may cause disconnection
Solution Approach 1:
The patent applies beforehand cushioning by introducing an adhesive layer into the annular space between the mounting ring and the longitudinal tip before the connector is screwed on. This adhesive bond acts as a cushioning element that absorbs and distributes the pullout forces and torque generated during connector assembly and injection, preventing adaptor disconnection
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 adaptor provides superior resistance to torque and pullout forces, ensuring secure connection and simplifying manufacturing by eliminating the need for attaching means like grooves or rings, particularly for glass-made devices, thereby enhancing patient and medical safety by reducing the risk of leakage and needle stick injuries.
Implementation Method 1
an annular space is created between said inner surface of the mounting ring and said outer surface of the longitudinal tip, the annular space being further able to accommodate an adhesive layer in order to bond said adaptor to said longitudinal tip
Data Source
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AI summary
The present invention relates to adaptor (30) for a drug delivery device having a reservoir (12) and a longitudinal tip (20), the adaptor (30) comprising a distal part defining a connecting ring (31) intended to receive a connector, and a proximal part defining a mounting ring (33) having an inner surface (34), the mounting ring (33) being shaped and configured such that, when the adaptor (30) is mounted around the longitudinal tip (20) of the drug delivery device, at least one annular space (38) is created between said inner surface (34) of the mounting ring (33) and said outer surface (20a) of the longitudinal tip (20), said at least one annular space (38) being able to accommodate an adhesive layer (40) in order to bond said adaptor (30) to said longitudinal tip. The invention further relates to a drug delivery device comprising such an adaptor.