Digital Fluid Mixing Control With Pressure Equalization Chambers
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Solution Overview
Problem
Existing surgical hand preparation methods, particularly the use of handrub formulations and water-antibacterial soap combinations, fail to consistently meet antisepsis requirements, leading to potential microbial infection risks due to inadequate sterilization and re-growth of flora on surgeons' hands during surgical procedures.
Innovation Solution
A digital control structure using discrete digital valves and pressure equalization cavities to precisely regulate the flow and mixing of fluids, ensuring equal pressures and controlled delivery of fluids at desired temperatures and flow rates, enhancing surgical hand preparation efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If handrub formulations are used for surgical hand preparation, then the procedure time is reduced and ease of operation is improved, but the reliability of sterilization deteriorates as they fail to consistently meet antisepsis requirements
Solution Approach 1:
The patent introduces an intermediary controlled fluid delivery system between the water source and the surgeon's hands. This system uses electronically controlled valves and pressure equalization cavities to precisely regulate the delivery of antimicrobial fluid, ensuring consistent application of effective concentrations without the variability of manual application methods.
Solution Approach 2:
The patent replaces manual mechanical application methods (handrub formulations applied by hand) with an electronically controlled fluid delivery system. This substitution uses electronic sensors, controllers, and motorized valves to automate and standardize the fluid application process, thereby improving sterilization reliability while maintaining ease of operation.
2Reliability
If prolonged agitation of skin under running water is performed, then sterilization effectiveness is improved, but the loss of time increases
Solution Approach 1:
The patent changes key parameters of the fluid delivery system including pressure (maintaining equal pressure at 0.05-2.0 psi), temperature (heating water to 104-113°F), and flow rate (controlling at 0.5-2.0 gallons per minute). These optimized parameters enable effective sterilization to be achieved in a shorter time period compared to traditional prolonged washing methods.
Solution Approach 2:
The patent implements continuous flow of temperature-controlled antimicrobial fluid through the surgical hand preparation system. The continuous delivery ensures constant exposure to effective concentrations without interruption, maintaining sterilization effectiveness while reducing total preparation time compared to intermittent or manual application methods.
3Manufacturing precision
If digitally controlled valves and pressure equalization cavities are used, then manufacturing precision of fluid delivery is improved, but device complexity increases
Solution Approach 1:
The patent segments the fluid delivery system into distinct functional modules: pressure equalization cavities for each fluid source, individual electronically controlled valves for each stream, and separate heating elements. This segmentation allows each component to be optimized independently for precision while managing overall system complexity through modular design.
Solution Approach 2:
The patent uses pressure equalization cavities to equalize pressure between different fluid sources before mixing. This equipotential approach simplifies the control logic by eliminating pressure differential complications, allowing the digital control system to focus on flow rate and temperature regulation rather than pressure balancing.
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 method ensures consistent and effective sterilization of surgeons' hands by maintaining equal fluid pressures and temperatures, reducing the risk of microbial transfer and re-growth, thereby improving surgical safety.
Implementation Method 1
A first pressure equalization cavity equalizes a pressure of the first water and a second pressure equalization cavity equalizes a pressure of the second water
Implementation Method 2
A heating element heats the mixed water to a desired temperature
Data Source
AI summary
A method and apparatus for controlling fluid flow by receive a first and second fluid into separate pressure equalization chambers that are isolated by diaphragms. The fluid are mixed by allowing them to flow over respective dams into a mixing chamber when their respective diaphragms are deformed. The pressure to the mixing chamber is equalized to ensure proper flow from each fluid stream.