Syringe Cannula Removal Safety Device
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Solution Overview
Problem
Existing cannula removers pose a risk of user puncture during cannula removal from a syringe due to manual rotation mechanisms, which can lead to accidents.
Innovation Solution
A safety device comprising a tube and annular casing that rotates relative to each other, with a sliding fit and clamping mechanism to securely attach to a syringe, reducing the risk of puncture by ensuring a secure grip and controlled cannula separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a manual rotation mechanism is used to separate the cannula from the syringe, then the cannula can be removed, but the user risks puncturing themselves during operation
Solution Approach 1:
The patent introduces a protective cage as an intermediary component between the user and the sharp cannula. The cage captures and contains the cannula during the separation process, allowing the cannula to be removed from the syringe while preventing direct user contact with the sharp element. This mediator structure enables safe operation by decoupling the separation function from direct manual handling of the sharp component.
2Strength
If the cannula is firmly threaded on the syringe to ensure secure attachment, then the connection is strong, but the cannula becomes difficult to remove
Solution Approach 1:
The patent employs a dynamic separation mechanism where the protective cage rotates relative to the syringe body. This rotational motion transforms the static threaded connection into a dynamic separation process. The cage engages with the threaded cannula and, through rotation, systematically disengages the threads while containing the cannula, thereby enabling easy removal despite strong initial attachment.
Solution Approach 2:
The separation mechanism is divided into distinct functional segments: the protective cage that captures the cannula, the rotational drive mechanism that engages the threaded connection, and the release mechanism that enables separation. This segmentation allows the system to maintain strong attachment during use while providing a dedicated, easy-to-operate removal function through the rotational cage mechanism.
Data Source
Figure 1A
Figure 1B
Figure 2A~2F
AI summary
The present invention relates to a method for increasing the safety in conjunction with the removal of a cannula (KA) from a syringe, wherein the cannula (KA) is removed from the syringe (S) by a separation mechanism. The invention also relates to a device for increasing the safety in conjunction with the removal of a cannula (KA) from a syringe. The method according to the present invention is characterized by that a tube (1) and a casing (3) mounted on the tube (1) are placed on the outside of an injection body (SK) on the syringe (S), that a cannula (KA) is mounted on the injection body (SK), that the tube (1) and the casing (3) are shifted in the direction against the cannula (KA) so that the tube (1) surrounds the cannula (KA), that the tube (1) is clamped fast relative to the injection body (SK) by a mutual rotation of the tube (1) and the casing (3) relative to one another, that a relative shifting of the tube (1) and of the casing (3) takes place in the longitudinal direction of the tube (1) in order to cancel the clamping action between the tube (1) and the injection body (SK), that the injection body (SK) is shifted relative to the tube (1) so that the cannula (KA is exposed, and that the separation mechanism separates the cannula (KA) from the injection body (SK).