Syringe Cover Sliding Range for Needle Mounting
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Solution Overview
Problem
The existing pharmaceutical syringe units face difficulties in easily mounting and removing injection needles due to the design of the distal end cap and syringe cover, which requires complex operations through a small opening, making the process cumbersome and inefficient.
Innovation Solution
The pharmaceutical syringe unit is designed with a distal end cap having openings on both ends and a syringe cover that can slide forward and backward, incorporating a guide component and engagement components to facilitate easy mounting and removal of the injection needle by allowing a greater sliding range than the needle insertion and withdrawal positions, exposing the large-diameter part for easier handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the injection needle is mounted through the distal end opening of the distal end cap, then the needle can be secured to the syringe cover, but the mounting operation becomes difficult and cumbersome
Solution Approach 1:
The syringe cover is designed to slide dynamically within the distal end cap along guide components, transitioning between a retracted state (for storage) and an extended state (for needle mounting). This dynamic positioning allows the needle mounting component to move from an inaccessible interior position to an accessible exterior position, resolving the contradiction between secure mounting and ease of operation.
Solution Approach 2:
The guide components act as intermediaries that enable the syringe cover to move smoothly between positions. By providing a guided sliding path, these components facilitate the transition of the needle mounting component from the interior to exterior of the distal end cap, making the mounting operation easier while maintaining secure attachment during injection.
2Device complexity
If the syringe cover is fixed in position, then the structure is simpler, but the needle cannot be properly inserted and withdrawn
Solution Approach 1:
Instead of a fixed structure, the syringe cover is designed with sliding capability along guide components. This dynamic feature, while adding some structural elements, enables the necessary needle insertion and withdrawal operations by allowing the cover to extend and retract, thus resolving the contradiction between structural simplicity and operational capability.
Solution Approach 2:
The distal end cap is segmented into functional zones: guide components that enable movement, a needle mounting component that slides, and engagement components that secure the assembly. This segmentation allows each part to perform its specific function while maintaining overall structural coherence, balancing simplicity with operational requirements.
3Volume of moving object
If the sliding range of the syringe cover is limited to the needle insertion and withdrawal positions, then the structure is compact, but the needle mounting and removal operations are difficult
Solution Approach 1:
The syringe cover is designed to slide beyond the minimum required range for needle insertion and withdrawal. This excessive sliding range allows the needle mounting component to be fully exposed at the exterior of the distal end cap, providing ample access for mounting and removal operations while maintaining a relatively compact overall structure when retracted.
Solution Approach 2:
The sliding motion of the syringe cover utilizes the axial dimension of the distal end cap, creating a linear displacement that exposes the needle mounting component. This dimensional approach allows the system to achieve ease of operation through spatial repositioning rather than increasing the radial or lateral dimensions, maintaining compactness while improving accessibility.
Data Source
AI summary
A pharmaceutical syringe unit is configured to be mounted to a pharmaceutical injection device main body and hold a pharmaceutical-filled pharmaceutical syringe, in order to mount the pharmaceutical syringe to a pharmaceutical injection device, wherein a syringe cover is configured to slide forward and backward with respect to a distal end cap by operation of the pharmaceutical injection device main body, thereby allowing movement between a needle insertion position at which insertion of an injection needle into a target is to be completed, and a needle withdrawal position at which withdrawal of the injection needle from the target is to be completed, and a guide component is configured to guide the syringe cover over a range that is greater than a distance between the needle insertion position and the needle withdrawal position.