Syringe Adapter Assembly for Power Injector
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Solution Overview
Problem
Existing power injectors, such as the '031 injector, face limitations including the need for pressure jackets that restrict syringe types, complex and maintenance-prone ram-plunger connections, and difficulty in viewing contrast media for air bubbles, as well as misalignment issues during syringe installation.
Innovation Solution
A syringe adapter assembly with a front door and rear connector plate, featuring axially-extending threaded apertures and a syringe lock mechanism to securely engage and lock syringes, ensuring proper alignment and preventing rotation during use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a pressure jacket is used to secure the syringe, then the syringe is held firmly against injection pressure, but the types of syringes that can be used are limited and it is difficult to view the contrast media inside the syringe
Solution Approach 1:
The device separates the pressure jacket from the syringe securing mechanism. The pressure jacket remains as a separate component for pressure containment, while the syringe is secured directly to the injector body through a bayonet-style coupling mechanism, allowing different syringe types to be used without being constrained by the pressure jacket design
Solution Approach 2:
The syringe securing function is extracted from the pressure jacket assembly and implemented as a separate bayonet-style coupling mechanism on the injector body. This allows the syringe to be firmly held during injection while enabling the use of various syringe types and improving visibility of the contrast media
2Strength
If a pressure jacket with complex ram-plunger connection is used, then the syringe is securely held, but the connection requires periodic maintenance and is prone to repair needs
Solution Approach 1:
The complex ram-plunger connection within the pressure jacket is replaced by extracting the securing function and implementing a simple bayonet-style coupling mechanism. This new mechanism uses straightforward rotational engagement with minimal moving parts, dramatically reducing maintenance requirements while maintaining secure holding strength
Solution Approach 2:
The syringe and adapter assembly is designed as a disposable unit that is replaced after each use, eliminating the need for maintenance of the connection mechanism. The simple bayonet coupling allows for quick installation and removal without requiring service or repair
3Ease of operation
If the syringe is allowed to rotate during installation, then the installation process is more flexible, but the syringe may not be fully installed and becomes misaligned causing fluid spillage
Solution Approach 1:
The bayonet-style coupling mechanism incorporates preliminary alignment features such as guide surfaces and positioning ribs that automatically align the syringe with the injector body during the rotational installation process. This ensures proper alignment is achieved before final engagement, preventing misalignment and fluid spillage while maintaining operational flexibility
Data Source
AI summary
A syringe adapter assembly 10 for permitting a front loadable power injector 100 having a pressure jacket 106 with an open front end to attach syringes 70 that do not require pressure jackets for their intended purpose. The syringe adapter assembly comprises a main adapter body 12 having a central bore 28 therethrough, a lifting ring 60 secured within the main adapter body 12, a connector plate 50 for attaching the main adapter body to the door injector, and a drive ram extender 30 that attaches to the drive ram. Additionally, the ram extender 30 may have a ram tip cone 40 attached at its forward end. The connector plate 50 is inserted into a recess 112 in the rear side of the door, and attaches to the main adapter body 12 located on the front side of the door. The invention additionally or alternatively comprises both a syringe lock 120 that locks an installed syringe relative to the injector to prevent unwanted movement of the syringe, and a method of locking syringe relative to an injector.