Low-Pressure Tip for Reactive Liquid Dispensing
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Solution Overview
Problem
Existing methods for dispensing reactive liquids during surgical procedures often result in premature reaction due to high-pressure mixing, which reduces the beneficial characteristics of the liquids upon application.
Innovation Solution
A low-pressure tip for a cannula that isolates reactive liquids and gases until application, using a high-pressure chamber and gas flow channels to create a low-pressure zone for controlled dispensing, preventing premature reaction and maintaining the beneficial properties of the liquids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If reactive liquids are mixed with high pressure gas in a high pressure chamber to form sprayed droplets, then the liquids can be dispersed and dispensed effectively, but the reactive liquids prematurely activate or react, reducing their beneficial characteristics
Solution Approach 1:
The device segments the gas flow and liquid flow into separate pathways until the moment of dispensing. The gas flows through a gas passage while the liquid flows through a liquid passage, preventing premature mixing. The segmentation is maintained through separate nozzles that only converge at the point of application, ensuring reactive liquids remain isolated until needed.
Solution Approach 2:
The patent introduces an intermediary low-pressure zone between the high-pressure gas source and the reactive liquid. This low-pressure zone acts as a mediator that allows gas to accelerate liquid droplets without the gas itself being in direct high-pressure contact with the reactive liquid, thereby preventing premature activation while maintaining dispensing effectiveness.
2Speed
If high pressure gas is used to spray reactive liquids, then droplets can be formed and dispersed, but the high pressure causes premature reaction between the reactive liquids
Solution Approach 1:
The device segments the gas flow and liquid flow into separate pathways until the moment of dispensing. The gas flows through a gas passage while the liquid flows through a liquid passage, preventing premature mixing. The segmentation is maintained through separate nozzles that only converge at the point of application, ensuring reactive liquids remain isolated until needed.
Solution Approach 2:
The patent applies different pressure conditions to different parts of the system. High pressure is applied locally to the gas source for effective droplet formation, while the reactive liquid maintains low pressure throughout its pathway. This local quality differentiation allows high-speed dispersion where needed while preventing premature reaction in other areas.
3Reliability
If reactive liquids are isolated prior to discharge to preserve beneficial characteristics, then premature reaction is prevented, but effective dispersing and dispensing becomes more difficult
Solution Approach 1:
The patent introduces an intermediary low-pressure zone between the high-pressure gas source and the reactive liquid. This low-pressure zone acts as a mediator that allows gas to accelerate liquid droplets without the gas itself being in direct high-pressure contact with the reactive liquid, thereby preventing premature activation while maintaining dispensing effectiveness.
Solution Approach 2:
The device uses pneumatic principles where pressurized gas flows through a gas passage and interacts with reactive liquid in a controlled manner. The gas pressure is regulated to create a low-pressure zone that facilitates liquid droplet formation and ejection without causing premature reaction, combining pneumatic power with chemical safety.
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
Enables effective dispensing of reactive liquids as droplets during surgical procedures without premature reaction, ensuring the beneficial characteristics are preserved and fully realized at the application site.
Implementation Method 1
The first tube and the first aperture are adapted to dispense the liquid and the gas for creating a low pressure zone distal of the first tube in order to dispense droplets of the liquid
Data Source
AI summary
A device and method for dispensing a liquid with a gas includes an instrument having a cannula and a low-pressure tip. The low-pressure tip includes a tip housing that at least partially defines a high pressure chamber. A distal wall of the tip housing includes an aperture in fluid communication with the high pressure chamber. The low-pressure tip also includes a tube and a gas flow channel. The tube fluidly communicates liquid at a relatively low pressure from the cannula through the first aperture. The gas flow channel fluidly communicates gas from the cannula at a relatively high pressure and to the high pressure chamber for discharge from the aperture. The tube and aperture are adapted to dispense the liquid and the gas in order to create a low pressure zone distal of the tube to dispense droplets of the liquid.