Injection Device Cap Segmentation for Syringe Boot Removal
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Solution Overview
Problem
Existing injection devices face difficulties in removing the hermetically sealed boot from a syringe without applying excessive force, which can damage the syringe and boot, and require a mechanism to connect the cap to the boot such that removal of the cap from the device causes removal of the boot with minimal force on the syringe and boot.
Innovation Solution
A cap design featuring a first part with grip means and a second part with retention means that allows the grip means to move from a first position to a second position, preventing the boot from being removed from the syringe until the retention means is moved from a third to a fourth position, thereby reducing the force required to remove the boot and ensuring it is disconnected from the cap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cap is designed to connect to the boot such that removal of the cap removes the boot from the syringe, then the boot can be removed from the syringe, but the force required to remove the boot is an order of magnitude greater than the maximum insertion force that can be exerted on the syringe without causing damage
Solution Approach 1:
The cap is divided into two separate parts: a first part that connects to the boot and a second part that connects to the injection device. This segmentation allows the boot removal function to be separated from the high-force connection to the injection device, enabling the boot to be removed with minimal force applied to the syringe.
Solution Approach 2:
The first part of the cap acts as an intermediary component between the boot and the injection device. It provides a connection mechanism that allows the boot to be attached to and removed from the syringe without requiring high forces to be transmitted to the syringe body, thus protecting the syringe from damage.
2Ease of operation
If a substantial force is applied to remove the boot from the syringe, then the boot can be removed, but damage to the syringe and/or boot will occur
Solution Approach 1:
By segmenting the cap into two parts with different connection mechanisms, the design allows boot removal to occur through detachment of the first part from the boot, rather than through high-force removal from the syringe. This protects the syringe and boot from damage while still achieving boot removal.
Solution Approach 2:
The first part of the cap serves as a protective intermediary that absorbs the removal forces, preventing these forces from being transmitted to the syringe and boot. This intermediary component can be designed to fail or detach at controlled points, protecting the more valuable syringe and boot components.
3Reliability
If the grip means is held in the first position by retention means, then the boot remains connected to the syringe, but the grip means must be movable to allow boot removal when needed
Solution Approach 1:
The grip means is designed to be movable between a first position (where the boot is retained) and a second position (where the boot can be removed). This dynamic capability allows the cap to transition between retaining and releasing the boot, providing both secure retention when needed and easy removal when needed without requiring complex additional mechanisms.
Data Source
AI summary
An injection device 110 is described having a housing 112 and a cap 130. The injection device 110 houses a syringe 114 having a needle which is sealed by a boot 118. The cap 130 is arranged so that the boot 118 can be connected to the cap 130 while exerting a minimal force on the syringe, but cannot be removed from the cap 130 without applying a significantly greater force to the syringe. The housing 112 and cap 130 are arranged so that upon removal of the cap 130 from the housing 112, the boot 118 is removed from the syringe 114.