Oval Gasket Claws for Miniaturized Injection Head
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Solution Overview
Problem
Conventional injection devices have not been sufficiently miniaturized, limiting their compactness and versatility, especially for applications in smaller spaces such as CT examination rooms.
Innovation Solution
The design incorporates a gasket with oval cross-sectional shape and engaging claws that displace between widened and narrowed positions, allowing for a reduced syringe size and a miniaturized injection head by aligning engaging claws in the height and width directions uniformly, enabling efficient chemical solution injection while maintaining stability and preventing backflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional syringe design is used, then injection function is achieved, but injection device size cannot be sufficiently miniaturized
Solution Approach 1:
The gasket is designed with an oval cross-section instead of a circular one, creating asymmetric geometry where the longer dimension aligns with the height direction. This asymmetric shape allows optimized engagement claw positioning and reduces the overall injection head footprint while maintaining reliable engagement through the specially designed inclined hole inlets that guide the ram securely.
Solution Approach 2:
The engaging claws are arranged in both height and width directions with specific symmetry (two claws aligned in height direction have same shape/size, two claws aligned in width direction have same shape/size). This multi-dimensional arrangement optimizes space utilization and enables compact injection head design while ensuring stable engagement from multiple directions.
2Ease of operation
If engaging claws are designed with enlarged diameter inlet inclined away from perpendicular line, then ram insertion is facilitated, but manufacturing complexity increases
Solution Approach 1:
The hole inlets of the engaging claws are designed with specific geometric parameters: enlarged diameter at the inlet and inclined orientation away from the perpendicular line passing through the center. This parameter optimization facilitates smooth ram insertion by guiding the ram along the inclined surface while the specific angle and enlargement ratio are chosen to balance ease of insertion with manufacturability using standard molding or machining processes.
Data Source
AI summary
An injection system has: a gasket having multiple engaging claws, and a distal end portion having across-sectional shape in which a length in a height direction of the cross-sectional shape is longer than a length in a width direction; a ram engaged with the gasket; a cylinder into which the gasket is inserted; and an injection device configured to move the ram and injecting a chemical solution in the cylinder. Each of the engaging claws includes an inner surface which defines a hole having an inlet with an enlarged diameter and inclined in a direction away from a perpendicular line passing through a center of the hole. The engaging claws are displaced between a widened position and a narrowed position. Two engaging claws aligned in the height direction have the same shape and size, and two engaging claws aligned in the width direction have the same shape and size.