CVC Blood Drawing Assembly with Single Port
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Solution Overview
Problem
Current methods for drawing blood from a central venous catheter (CVC) involve multiple syringe changes, increasing the risk of contamination and blood waste, as each syringe detachment provides opportunities for bacterial or viral introduction and discards patient blood during the flushing process.
Innovation Solution
A disposable, non-rotatable CVC configuration with a singular removable port allows selective communication between the CVC hub and multiple syringes through a single attachment device, maintaining a closed system to reduce contamination risks and conserve blood by reusing 'waste' fluid and enabling blood sampling without repeated detachment from the CVC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple syringes are used to flush and draw blood from the CVC line, then the blood sampling function is achieved, but the risk of contamination increases due to repeated detachment and reattachment of syringes
Solution Approach 1:
The system divides the blood sampling process into distinct functional segments (flushing syringe, blood drawing syringe, saline syringe) that can be sequentially connected to the CVC hub through a single port, allowing each syringe to perform its specific function without requiring simultaneous manipulation of multiple syringes
Solution Approach 2:
A universal adapter or hub interface acts as an intermediary between the CVC line and multiple syringes, enabling different syringes to connect to the same port through a standardized interface, thereby reducing direct manipulation of the CVC hub itself
2Reliability
If the CVC line is flushed with saline before blood drawing, then the line is cleared of previous infusions, but patient blood is wasted during the flushing process
Solution Approach 1:
The system extracts only the necessary amount of blood for testing by using a separate blood drawing syringe after the flushing step, rather than discarding all fluid in the line, thereby conserving patient blood while still obtaining adequate sample volume
Solution Approach 2:
Instead of discarding the flushed blood mixed with saline, the system recovers usable blood samples from the flush mixture by drawing a specific volume into a blood collection syringe, thereby reducing blood waste while maintaining sample quality
3Reliability
If three separate syringes are used for flushing and blood drawing, then the CVC line is properly prepared and sampled, but the process time increases due to multiple detachment and reattachment steps
Solution Approach 1:
The CVC line is pre-flushed with saline before blood drawing begins, and the hub is pre-prepared with multiple syringe ports, allowing the blood sampling process to proceed without interruption or repeated detachment steps
Solution Approach 2:
The system maintains continuous connection to the CVC hub throughout the entire blood sampling process, allowing flushing and blood drawing to occur in sequence without breaking the sterile barrier or requiring repeated attachment/detachment cycles
Data Source
AI summary
A blood drawing assembly for use with a CVC hub includes a collection hub with a plurality of ports for the acceptance of a plurality of syringes. A CVC hub is coupled to the collection hub and routed internally within the collection hub to a syringe attachment device. The syringe attachment device is selectively moved to align with one of a plurality of syringes for the flushing of the CVC and the withdrawing of the blood. The assembly is used in non-sterile environments and is configured to be disposable after use. Fluids may be exchanged or passed through the collection hub and the syringes from the patient's body.