Syringe Pair Assembly Segmented Fitting for Sterile Disconnection
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Solution Overview
Problem
Current syringe pair assemblies for biological fluids are difficult to handle efficiently in surgical settings, often leading to improper disconnection from fittings, potential exposure to ambient conditions, and compromised sterility, resulting in increased costs and time losses due to handling errors and accidental spillage of contents.
Innovation Solution
A syringe pair assembly featuring a fitting composed of two releasably connected parts with a pretension connection mechanism, an inner membrane for enhanced sterility, and a valve system to prevent spillage, allowing for clear detection of disconnection and easy handling while maintaining sterility during use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a spring-biased plastic retaining member is used to secure the barrel-holding frame to the fitting, then the assembly can be easily assembled, but the disconnection process becomes complex and error-prone requiring multiple steps
Solution Approach 1:
The fitting is divided into two separate parts: a first fitting part that remains attached to the dispensing system and a second fitting part that moves with the syringes. This segmentation allows the retaining member to simply pull the second part away from the first part, creating a clear, single-step disconnection action without complex spring mechanisms.
2Reliability
If the syringes are frictionally held by the fitting, then the connection is secure, but the disconnection may be incomplete leading to improper separation
Solution Approach 1:
The fitting connection is designed with both frictional engagement (radial dimension) and a retaining member engagement (axial dimension). The retaining member provides a positive mechanical latch that ensures complete separation when pulled, supplementing the frictional hold and preventing incomplete disconnection.
3Ease of operation
If the membrane is peeled apart to remove syringes from fitting, then the syringes can be accessed, but the syringe pair may be dropped compromising sterility
Solution Approach 1:
The fitting is segmented into two parts where the second part remains attached to the syringes when disconnected from the first part. This allows the syringes to be removed as a secure unit from the fitting without manual peeling operations, eliminating the risk of dropping and maintaining sterility.
4Reliability
If additional handling is required to disconnect syringes from fitting, then proper disconnection can be achieved, but time is lost in the therapeutic procedure
Solution Approach 1:
The retaining member is pre-positioned and engaged with the fitting during assembly. During disconnection, simply pulling the retaining member automatically triggers the separation mechanism, eliminating the need for multiple manual steps or twisting motions and reducing procedure time while maintaining reliable disconnection.
Data Source
Figure 1A~1C
Figure 2A~2E
Figure 3A~4B
AI summary
Syringe pair assembly for biological fluids. Each syringe comprises a barrel, a nozzle and a plunger. A barrel holding frame holds the barrels and a plunger holder holds the plungers. A fitting with tubing frictionally holds the nozzles and links the two nozzles to the tubing. An outer membrane encloses the syringes and has one end sealed over the fitting with tubing and another closed end deployed about the syringe plungers and adapted for allowing an operator to grasp and extend the plunger ends during filling of the syringes without exposure to ambient conditions. The fitting is formed by a first fitting part and a second fitting part which are releasably connected to each other by means of a connection member. The tubing and the one end of the outer membrane are attached to the first fitting part, while the second fitting part frictionally holds the nozzles of the two syringes. The assembly further comprises an inner membrane positioned within the outer membrane, said inner membrane enclosing the two syringes and having one end sealed to the second fitting part.