Aspiration Syringe Segmented Support for One-Handed Cannulation
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Solution Overview
Problem
Traditional syringes lack support for clinicians to securely hold and create a vacuum during blood-vessel cannulation, making it difficult to receive tactile feedback upon successful vessel access.
Innovation Solution
An aspiration syringe with a thumb-support member and a syringe housing that includes a finger-support member with a flange, allowing for secure grip and vacuum creation with a single hand, facilitating needle insertion and fluid aspiration by sliding the syringe housing over the barrel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional syringes are used for blood-vessel cannulation, then the syringe can create a vacuum for tactile feedback, but the clinician lacks support to securely hold and operate the syringe with one hand
Solution Approach 1:
The syringe is segmented into distinct functional zones: a thumb-support member at the proximal end for thumb placement, a syringe housing with finger-support member for finger placement, and the barrel with plunger. This segmentation allows each part of the hand to have a dedicated support structure, enabling secure one-handed operation while maintaining vacuum creation capability for reliable tactile feedback during cannulation
Solution Approach 2:
The finger-support member with flange acts as an intermediary structure between the clinician's fingers and the syringe housing. This intermediary provides a stable interface that transfers and distributes the gripping force, enabling secure holding of the syringe during vacuum creation and needle insertion without compromising operational control
2Reliability
If the syringe housing is slid over the barrel to withdraw the plunger, then vacuum creation is achieved, but the structure becomes more complex
Solution Approach 1:
The syringe housing is designed to be slidable relative to the barrel, transforming the syringe from a static structure to a dynamic one. This dynamic configuration allows the housing to move proximally over the barrel during vacuum creation, withdrawing the plunger to generate negative pressure. The dynamic design achieves reliable vacuum creation while maintaining relatively simple construction through straightforward sliding motion rather than complex mechanisms
Solution Approach 2:
The syringe housing combines multiple functions: it serves as the structural body housing the plunger, provides the finger-support member for gripping, and acts as the sliding mechanism for vacuum creation. By merging these functions into a single integrated component, the design achieves reliable vacuum creation without adding separate complex mechanisms for each function
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables secure handling and effective vacuum creation, allowing for reliable tactile feedback and efficient cannulation and aspiration processes, improving the clinician's ability to establish blood-vessel access and draw fluids.
Implementation Method 1
draw a vacuum with the aspiration syringe while inserting the needle into the subcutaneous tissue of the patient
Implementation Method 2
the feedback resulting from a pressure differential upon release of the vacuum when a tip of a needle coupled to the syringe enters the blood vessel
Data Source
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AI summary
Aspiration syringes and methods thereof are disclosed. An exemplary aspiration syringe can include a barrel, a plunger disposed in the barrel, and an aspiration mechanism. The aspiration mechanism can include a thumb-support member coupled to a distal portion of the barrel and a syringe housing slidably disposed around the barrel. The syringe housing can include a proximal portion coupled to a proximal portion of the plunger and a distal portion terminating with a flange incorporated into a finger-support member. The aspiration mechanism can be configured for withdrawing the plunger from the barrel as the finger-support member is slid over the barrel toward the thumb-support member. An example method of the foregoing aspiration syringe can include a fluid-aspirating step including aspirating fluid from a fluid-containing space with a single hand over a medial portion of the syringe by squeezing together the finger-support member and the thumb-support member.