Rotating Spindle Syringe with Dual-Mode Dispensing
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Solution Overview
Problem
Existing rotating spindle syringes are either unsuitable for quick material dispensing or are expensive and not ergonomically designed for fine dosing.
Innovation Solution
A compact rotating spindle syringe design featuring a housing, outlet cannula, and plunger for intuitive operation, allowing for rapid material delivery by pressing the plunger and fine dosing by rotating a driver that acts on a piston, enabling one-handed operation with a rotary element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a traditional rotating spindle syringe design is used, then fine dosing can be achieved by turning a knurled wheel, but rapid material delivery becomes difficult or impossible
Solution Approach 1:
The syringe system dynamically switches between two operational modes: fine dosing mode where the rotary element engages the driver through threaded connection for precise control, and rapid delivery mode where the plunger is pushed directly against the piston for high-speed material ejection. This dynamic reconfiguration allows the system to adapt its mechanical interaction based on the required dispensing rate.
Solution Approach 2:
The syringe integrates multiple functions into a single device: the plunger serves both as a direct pushing mechanism for rapid delivery and as a component that can work in conjunction with the rotary element for fine dosing. The system universally handles both precision dispensing and high-volume ejection through its dual-mode operational capability.
2Measurement precision
If a separate piston and threaded cap mechanism are used for fine dosing, then precise control is achieved, but the device becomes expensive and loses the typical syringe form
Solution Approach 1:
The driver is integrated directly into the plunger assembly, merging the fine dosing mechanism with the main pushing component. The threaded connection between the rotary element and driver is incorporated within the existing syringe structure, eliminating the need for separate dosing mechanisms and maintaining a compact, unified syringe form.
Solution Approach 2:
The plunger serves dual purposes: it acts as the primary pushing mechanism for rapid material delivery and simultaneously works with the rotary element through the driver for fine dosing operations. This multi-functionality eliminates the need for separate specialized components, reducing overall device complexity while maintaining both precision and speed capabilities.
3Productivity
If the driver is in frictional engagement with the piston for direct pushing, then rapid material ejection is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The driver acts as an intermediary component between the plunger and the piston. Instead of requiring direct high-precision frictional engagement between the plunger and piston, the driver mediates the force transmission, allowing for more tolerant manufacturing specifications while still achieving rapid material ejection through the coordinated action of plunger and driver.
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
Ensures dual functionality for rapid and fine material delivery, with intuitive usability and optional pressure-activated dispensing, maintaining ergonomic design and cost-effectiveness.
Implementation Method 1
the rotary element has a correspondingly long internal thread which is in threaded engagement with a correspondingly shaped external thread of the driver
Implementation Method 2
Material can be pressed out of the outlet cannula quickly and easily by pressure on the plunger
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a rotary spindle syringe with a threaded rotary element (24) that engages in a threaded connection with a driver (40), wherein the driver (40) acts on a piston (16) and is mounted to be translationally movable relative to it, and the rotary spindle syringe (10) dispenses material both when the rotary element (24) is actuated and when pressure is applied to a hand rest (50) of the piston (16) or a plunger (62) of the piston (16).