Retractable Needle Assembly for Extracorporeal Blood Sampling
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Solution Overview
Problem
Existing fluid sampling and infusion devices for extracorporeal blood treatment apparatuses often lead to clot formation due to internal stagnation areas and pose hazards from sharp needles, requiring safer and more versatile solutions that are compatible with various sampling or infusion sites.
Innovation Solution
A fluid sampling or infusion device with a protective body and needle assembly that moves between enclosed and protruding positions, allowing safe piercing and retraction, and is compatible with multiple site configurations, using a self-sealing septum and automated retraction mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If needleless sampling or infusion sites are used, then user safety is improved, but clot generation occurs due to internal stagnation areas
Solution Approach 1:
The invention extracts the needle from the sampling/infusion site structure and places it in a separate, movable protective body. The needle is no longer integrated into the sampling site but is instead a separate component that can be safely retracted into the protective body after use, eliminating the stagnation area problem while maintaining needle functionality.
Solution Approach 2:
The needle assembly is made dynamic by allowing it to move between a protruding position (for sampling/infusion) and a retracted position (for safety). The protective body can be actuated to automatically retract the needle, transforming a static, hazardous structure into a dynamic, safe system that adapts its state based on operational needs.
2Ease of operation
If sharp needles are used for sampling, then sampling function is achieved, but hazardous situations are created for the user
Solution Approach 1:
The protective body acts as an intermediary between the user and the sharp needle. It provides a safe interface that allows the needle to be handled during sampling while automatically retracting to protect the user afterward. The protective body mediates the interaction, enabling the sampling function while eliminating direct exposure to hazards.
Solution Approach 2:
The protective body is designed as a disposable component that is discarded after a single use. This eliminates the need for cleaning and reuse, ensuring that any potential contamination or hazard is contained within the disposable unit and does not pose a risk to the user or environment after the sampling procedure.
3Device complexity
If fixed sampling sites are used, then sampling is simplified, but adaptability to various site configurations is reduced
Solution Approach 1:
The protective body is designed with universal compatibility to work with various sampling and infusion site configurations. It can accommodate different site shapes, sizes, and locations on the patient's body, making it a multi-functional device that adapts to different clinical needs while maintaining operational simplicity.
Data Source
AI summary
A fluid sampling or infusion device for an extracorporeal blood treatment apparatus comprises: a protective body (29) having a first aperture (30) and a second aperture (31) and comprising a connecting device (28) configured to connect, optionally in removable manner, the protective body (29) to a sampling or infusion site (20) of the extracorporeal blood treatment apparatus (1); a needle assembly (33) comprising a first end (34) connected or connectable, optionally in removable manner, to a syringe (22) and a needle (35) protruding from a second end opposite the first end (34). The needle assembly (33) is movable inside the protective body (29) between a first position and a second position. In the first position the needle (35) is completely enclosed by the protective body (29) and in the second position the needle (35) protrudes from the second aperture (31) to pierce the sampling or infusion site (20).