Palm-Held Syringe Grip Adapter for Precise Small-Volume Injection
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Solution Overview
Problem
Existing syringe grips for administering staining and contrast agents lack precision and control, particularly for small volume ejections, and often require complex muscle engagement that can lead to inaccuracies.
Innovation Solution
A syringe adapter with a palm-held design featuring a support base with a first end wall conforming to the palm and a second end wall with finger depressions, allowing thumb control for precise fluid ejection, and a twist-and-lock mechanism for secure syringe attachment, suitable for both left and right-handed users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If standard three-finger grip is used on syringe, then ability to push during infusion is improved, but accuracy for precise and small volumes deteriorates due to wrist engagement
Solution Approach 1:
The grip is segmented into two independent components: a stationary base that anchors to the syringe and a movable plunger interface. This allows the thumb to control plunger movement independently from the other fingers that stabilize the base, separating the pushing function from the stabilization function and eliminating wrist engagement interference.
Solution Approach 2:
The adapter acts as an intermediary device between the hand and the syringe plunger. It provides a mechanical interface where thumb pressure is translated into precise plunger movement, while the other fingers provide counter-pressure through the base, mediating the force application to achieve both ease of operation and measurement precision.
2Measurement precision
If thumb control mechanism is implemented, then ejection volume accuracy is improved, but device complexity increases
Solution Approach 1:
Complexity is localized to the interface between the thumb and plunger, where precise control is needed. The rest of the adapter structure maintains simple, symmetric geometry that is easy to manufacture. The base portion uses uniform thickness and simple circular features, concentrating the functional complexity only where it provides value.
Solution Approach 2:
The adapter introduces asymmetric features only where needed for function: the plunger interface is asymmetric to match the plunger rod geometry, while the overall adapter shape and base structure remain symmetric for ease of manufacturing. This selective asymmetry achieves precise control without proportionally increasing overall device complexity.
3Measurement precision
If palm-held design is used, then wrist movement is minimized improving accuracy, but ease of operation for left and right-handed users deteriorates
Solution Approach 1:
The adapter is designed with bilateral symmetry and ambidextrous features that allow it to function equally well for both left-handed and right-handed users. The base and finger placement areas are symmetric, and the plunger interface can be approached from either side, making the device universal across different user preferences while maintaining the palm-held accuracy advantage.
Data Source
AI summary
A hand grip adapter for a syringe formed from a body having a first end wall and a second end wall with a support base therebetween. The support base includes a centrally disposed receptacle for receipt of a syringe flange. The first end wall formed perpendicular to the support base having a curvature outer surface to conform to the palm of an individual's hand. The second end wall is formed parallel to the first end wall and includes four finger depressions wherein an individual can place their index, middle, ring, and little finger. At least one of the depressions includes a rim forming a circular opening for ease of grasping. The first side wall is configured to rest in the palm of an individual's hand and said second end wall is configured to receive the finger tips from the individual's hand with a syringe secured in the support base.