Rotational Ejection Device for Precise Paste Dosing
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Solution Overview
Problem
Existing devices for ejecting liquid or pasty products, such as those used in medicine and dentistry, face challenges in precision control and hygiene, particularly in cosmetic surgery where small doses of thick or pasty substances like hyaluronic acid require significant ejection force, and current designs with toothed pusher cylinders are limited in precision and reliability.
Innovation Solution
A device featuring a threaded rod, bolt, and lever mechanism with a pawl and ratchet system that allows precise control of ejection through rotation, enabling controlled movement of the threaded rod for accurate dosing, combined with a non-return mechanism for hygiene and audible feedback for minimal dose indication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a toothed pusher cylinder with ratchet mechanism is used, then the device is simple and easy to operate, but the precision of dose control is insufficient for very small doses
Solution Approach 1:
The pusher cylinder is segmented into multiple sections, each with its own toothed rim. This segmentation allows for finer control of the pusher movement, enabling precise control of very small doses while maintaining the simplicity of the ratchet mechanism. The segmented design provides multiple engagement points for the pawl, increasing the resolution of dose control.
Solution Approach 2:
The invention introduces a dimensional change by adding a second toothed rim at a different axial position on the pusher cylinder. This second rim engages with a second pawl, creating a multi-dimensional control system that enhances dose precision without complicating the overall mechanism. The vertical arrangement of multiple toothed rims provides additional control dimension.
2Measurement precision
If the number of teeth on the pusher cylinder is increased, then the precision of dose control is improved, but the teeth become smaller with less hold, reducing reliability
Solution Approach 1:
Instead of having one long toothed rim with many small teeth, the invention segments the toothed structure into multiple separate toothed rims. Each rim has fewer, larger teeth that provide reliable engagement. The multiple rims distributed along the pusher cylinder's length collectively provide the necessary precision through their combined effect, while each individual tooth maintains sufficient size for reliable engagement.
Solution Approach 2:
The invention resolves the contradiction by transitioning from a single-dimensional continuous toothed surface to a multi-dimensional distributed arrangement of toothed rims. This spatial distribution allows the teeth to be larger and more reliable while still providing fine-grained control through the cumulative effect of multiple engagement points along the pusher's travel.
3Device complexity
If a conventional syringe with piston is used, then the structure is simple, but it is difficult to manipulate and control the ejection of precise doses
Solution Approach 1:
The invention replaces the conventional linear piston pushing mechanism with a rotational mechanism. The pusher cylinder rotates to advance the pusher, which is actuated by a pawl engaging with toothed rims. This mechanical substitution transforms the operation from linear pushing to rotational turning, significantly improving ease of manipulation and control while maintaining structural simplicity through the use of basic mechanical elements.
Solution Approach 2:
The invention introduces dynamic characteristics by making the pusher cylinder rotatable rather than fixed. The rotational motion of the pusher cylinder, controlled by the pawl-ratchet mechanism, provides smooth and controllable advancement of the pusher. This dynamic approach allows for precise control of the ejection process, making the device easier to manipulate compared to the static piston system.
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
The solution provides precise control over small doses, enhances hygiene, and is economical, making it suitable for applications requiring high precision like cosmetic surgery, while maintaining simplicity and reliability.
Implementation Method 1
a threaded rod (3), which is movable in translation so as to act on the product to be ejected, a bolt (5), which is mounted in engagement with the threaded rod in order to cause the latter to move in translation
Data Source
AI summary
The invention relates to a device for ejecting a liquid or paste product, including a body (2) having a recess (11) for receiving a product to be ejected, characterized in that it includes a threaded rod (3), which is translatably movable so as to act on the product to be ejected, a bolt (5), which is mounted so as to engage with the threaded rod (3) in order to cause same to translatably move, and a lever (1) acting on the bolt (5) by means of a control means for causing the rotation thereof.