Medicament Cap Assembly With Cam-Driven Shield Gripping
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Solution Overview
Problem
Existing medicament delivery devices face difficulties in efficiently and easily assembling the delivery member shield with the cap assembly, particularly due to the design of the connector in WO2015110532 A1, which makes it challenging to insert the needle cover or rigid needle shield into the connector.
Innovation Solution
A cap assembly with a tubular body and a squeeze member featuring radial arms and a cam structure that allows for easy assembly by rotating the squeeze member relative to the cap, engaging and disengaging the radial arms from recesses to provide radial pressure on the delivery member shield, facilitating its insertion and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connector design from WO2015110532 A1 is used, then the needle cover and rigid needle shield can be secured together through barbs, but it becomes challenging to insert the needle cover or rigid needle shield into the connector
Solution Approach 1:
The radial arms are designed to be flexible and capable of dynamic movement between engaged and disengaged positions. During insertion, the arms flex outward to allow passage of the needle cover, then snap inward to engage with the barbs, providing both ease of insertion and secure retention
Solution Approach 2:
The radial arms change their positional parameter from an engaged state (pressing against the inner surface of the cap) to a disengaged state (allowing insertion), and finally to a locked state (securing the needle cover). This parameter change enables the transition between ease of operation and reliability
2Reliability
If the radial arms are pressed into the channel by the inner walls of the tubular body, then the cross-sectional area of the channel is reduced, but this makes assembly more difficult
Solution Approach 1:
The radial arms are pre-positioned in an engaged state during manufacturing, pressing against the channel walls to reduce cross-sectional area and secure the delivery member shield. The cam structure is designed to automatically maintain this gripping action without requiring additional assembly steps
Solution Approach 2:
The cam structure automatically controls the radial arms to engage and disengage based on the assembly process itself. As the squeeze member is axially displaced during assembly, the cam surface automatically causes the radial arms to move between engaged and disengaged positions, eliminating the need for separate manual operations
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 cap assembly simplifies the assembly process by allowing the delivery member shield to be easily mounted and removed from the medicament container, enhancing user convenience and efficiency.
Implementation Method 1
the tubular body has a cam structure provided inside the distal opening, and the squeeze member has a proximal end face configured to cooperate with the cam structure of the cap, whereby axial displacement of the squeeze member from a first position to a second position causes rotation of the squeeze member relative to the cap
Implementation Method 2
the radial arms are configured to disengage from the respective radial recess when the squeeze member is displaced from the first position to the second position and rotated, whereby the flexible radial arms are pressed into the channel by the inner walls of the tubular body, reducing a cross-sectional area of the channel
Data Source
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AI summary
A cap assembly for a medicament delivery device is disclosed. The cap assembly includes a cap configured to be mounted to a proximal end of the medicament delivery device, wherein the cap comprises a cam surface. The cap assembly further includes a squeezer comprising (i) a body defining a first longitudinally extending channel configured to receive a delivery member shield and (ii) a plurality of radial arms flexible in a radial direction. The cap assembly also includes a spinner comprising (i) a proximal end face configured to cooperate with the cam surface of the cap, (ii) a body defining a second longitudinally extending channel configured to receive the squeezer, and (iii) a plurality of holes in the body of the spinner configured to receive the plurality of radial arms of the squeezer.