Vacuum Pressure Syringe Locking Assembly Without Plunger Rotation
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Solution Overview
Problem
Existing vacuum pressure syringes require cumbersome rotation of the plunger rod to lock and unlock, making them difficult to use in procedures like thrombectomies and angioplasty.
Innovation Solution
A syringe assembly with a syringe barrel and elongate plunger rod featuring plunger rod locking slots and a locking element that allows for locking without rotation, utilizing a pivotable locking tab, clip assembly, or slidable bracket to secure the plunger rod at various lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If locking fins on the plunger rod are used to lock the syringe, then the syringe can be locked after retracting to create sustained vacuum, but the plunger rod must be rotated which is cumbersome and difficult to accomplish
Solution Approach 1:
Instead of rotating the plunger rod to engage locking fins with the syringe barrel, the invention inverts the mechanism by making the locking element rotate to engage with locking slots on the plunger rod. This inversion eliminates the need to rotate the plunger rod itself, directly resolving the operational difficulty while maintaining reliable locking.
Solution Approach 2:
The invention introduces an intermediary locking element (such as a locking tab or clip) that mediates between the plunger rod and the syringe barrel. This locking element engages with locking slots on the plunger rod and features that engage with the syringe barrel, eliminating the need for direct rotation of the plunger rod while achieving reliable locking.
2Adaptability or versatility
If the plunger rod is rotated to lock in various positions, then varying amounts of fluid can be aspirated, but the operation becomes cumbersome and time-consuming
Solution Approach 1:
The invention inverts the locking mechanism so that the locking element rotates rather than the plunger rod. This allows rapid selection of different locking positions by rotating the locking element to engage different locking slots, significantly reducing the time required while maintaining adaptability to various aspiration volumes.
Solution Approach 2:
The locking slots are pre-positioned on the plunger rod at various locations corresponding to different aspiration volumes. The locking element is designed to engage these pre-positioned slots, allowing the user to quickly select the desired volume without time-consuming adjustments, as the locking positions are prepared in advance.
Data Source
AI summary
A syringe assembly comprises a syringe barrel having an open proximal end having a pair of gripping flanges and a distal end including a distal wall having a passageway therethrough in fluid communication with the chamber, the open proximal end including a peripheral flange. An elongate plunger rod is disposed within the syringe barrel, the elongate plunger rod comprising a distal end and a proximal end, the distal end including a stopper, the elongate plunger rod including a plurality of slots located between the distal end and the proximal end, and the elongate plunger rod extendible to a plurality of different locked lengths using a locking element mounted to the proximal end of the syringe barrel to engage the plurality of plunger rod locking slots to permit varying amounts of fluid to be aspirated into the syringe barrel without rotating the elongate plunger rod.