Thumb-Fastened Plunger Control for One-Handed Aspiration
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Solution Overview
Problem
Existing technologies face limitations in achieving precise and one-handed operation of plungers in medical and industrial devices, particularly in aspirating and injecting substances, lacking the necessary dexterity and control.
Innovation Solution
A ring is fastened to the user's thumb to secure the plunger, allowing for precise and one-handed retraction and advancement of the plunger, enhancing dexterity and control during medical procedures such as hypodermic injections and industrial operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional two-handed operation is used to achieve plunger control, then stability and control are improved, but operation speed and efficiency deteriorate due to requiring both hands
Solution Approach 1:
The device separates the plunger control function from the syringe body by adding a独立的环状装置 (independent ring device) that can be worn on the finger. This segmentation allows one hand to hold the syringe while the other hand's finger controls the plunger through the ring, resolving the contradiction between stability and efficiency.
Solution Approach 2:
The ring device acts as an intermediary between the finger and the plunger flange. It provides a mechanical connection that translates finger motion into precise plunger control, enabling one-handed operation while maintaining the stability previously achieved with two-handed control.
2Measurement precision
If conventional two-handed operation is used for plunger retraction, then precision is improved, but device complexity increases due to requiring coordination of both hands
Solution Approach 1:
The plunger control function is extracted from the main syringe body and placed on a separate wearable ring device. This extraction simplifies the operational complexity by allowing the plunger to be controlled independently through the ring, while maintaining precision through the mechanical connection design.
3Productivity
If one-handed operation is attempted without assistance, then operation speed is improved, but measurement precision deteriorates due to lack of stable control
Solution Approach 1:
The solution adds a spatial dimension by wearing the ring on the finger, creating a new degree of freedom for control. This allows the user to control the plunger through finger motion while the hand holds the syringe, achieving both speed and precision in one-handed operation.
Data Source
AI summary
An apparatus can aid usage of a plunger, for example helping a medical practitioner use a hypodermic syringe to inject dermal filler. The apparatus can fasten a thumb rest of a plunger of the syringe to a thumb of the practitioner and can support one-handed operation of the syringe. With the plunger so fastened, reverse thumb motion can retract the plunger for aspiration, and forward thumb motion can advance the plunger for injection. The apparatus can comprise a member extending at least partially around the practitioner's thumb. The member can comprise an aperture configured to retain the thumb rest between the thumb and the member, with a shaft of the plunger passing through the aperture.