Syringe Finger-Grip Device with Snap-Lock and Anti-Slip Relief
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Solution Overview
Problem
Existing finger-grip devices for medical syringes require careful placement and disconnection for plunger removal, complicating operations, especially in emergency situations, and involve complex industrial production processes.
Innovation Solution
A finger-grip device anchored to the flange of a syringe barrel with a secure 'final-click snap-lock' mechanism, providing an increased contact surface without obstructing plunger movement, featuring anti-slip high relief means and coaxial circular cavities that allow secure attachment without hindering plunger run.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a finger-grip device is anchored to the syringe barrel using penetration protuberances (US 2003/0220615), then the device provides secure anchoring and plunger stopping function, but the device structure becomes complex and difficult to manufacture
Solution Approach 1:
The finger-grip device is divided into two separate parts: a flange component that anchors to the syringe barrel, and a finger-grip component that provides the gripping surface. These parts are connected through a hinge mechanism, allowing them to move relative to each other. This segmentation simplifies the structure of each individual part while maintaining the secure anchoring function through the flange's engagement with the barrel flange.
Solution Approach 2:
The hinge connection between the flange and finger-grip components introduces dynamic movement capability. The finger-grip component can rotate relative to the flange, allowing it to adapt to different plunger positions and maintain effective gripping throughout the injection or withdrawal process, while the flange remains securely anchored.
2Device complexity
If a finger-grip device is designed as an integral part of the cylindrical barrel, then the device structure is simplified, but the contact surface for finger placement is insufficient
Solution Approach 1:
The finger-grip component extends the contact surface area by adding a dimensional element perpendicular to the barrel axis. The flared shape of the finger-grip component creates additional surface area for finger placement, allowing operators to securely grip the device during use without increasing the complexity of the overall structure.
3Ease of operation
If the finger-grip device is designed to stop the plunger during operation, then plunger control is improved, but the device complexity increases due to additional locking mechanisms
Solution Approach 1:
The stopping function is merged with the existing hinge connection between the flange and finger-grip components. The hinge mechanism serves dual purposes: it allows relative movement for gripping flexibility, and it provides a natural stopping point when the plunger reaches the desired position. This eliminates the need for separate locking mechanisms while maintaining effective plunger control.
4Reliability
If a finger-grip device with anti-slip means is added to the syringe, then the gripping stability is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Anti-slip features are applied locally to specific surfaces of the finger-grip component rather than throughout the entire device. The flared surface of the finger-grip component is designed with inherent geometric features that provide friction and grip stability. This localized approach improves gripping stability without requiring complex anti-slip materials or treatments across the entire device, thereby simplifying manufacturing.
Data Source
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AI summary
The present invention relates to a finger-grip device designed to be placed on the flange of a cylindrical barrel of a medical syringe or cartridge, increasing the contact surface with the fingers of the operator during the injection or withdrawal of fluids to or from a patient, characterised in that it does not stop or hinder the run of the plunger within the cylindrical barrel.