Breath-Activated Nebulizer Fluidic Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional nebulizers face issues such as medication waste when not in use, difficulty in quantifying aerosol delivery, and movable parts that can stick together, requiring complex and costly actuation systems and precise manufacturing.
Innovation Solution
A nebulizer system with a stationary diverter and fluidic control system that uses a control gas to selectively actuate nebulization based on patient inhalation, reducing the need for negative pressure and minimizing moving parts, allowing for efficient and consistent medication delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a movable diverter is used to selectively nebulize medication in response to patient breath, then medication waste is reduced during non-inhalation periods, but the device complexity increases and moving parts may stick together requiring costly diaphragms and springs
Solution Approach 1:
The patent replaces the mechanical movable diverter system with a fluidic control system that uses gas flow dynamics to achieve the same selective nebulization function. The fluidic amplifier uses pressure differential created by patient inhalation to control gas flow paths, eliminating mechanical moving parts while maintaining breath-responsive operation.
Solution Approach 2:
The patent employs pneumatic principles through the fluidic amplifier that uses pressurized gas flows and pressure differentials to control the nebulization process. The system uses the patient's inhalation-induced negative pressure to modulate gas flow through the fluidic circuit, achieving actuation without mechanical components.
2Measurement precision
If a movable diverter with close tolerances is used for precise control of gas flow, then nebulization control is improved, but manufacturing precision requirements increase and design becomes more difficult
Solution Approach 1:
The patent eliminates the need for precision-machined movable diverters by replacing the mechanical positioning system with a fluidic control system. The fluidic amplifier uses flow dynamics and pressure differential to achieve precise gas flow control without requiring mechanical components to be positioned with tight tolerances.
Solution Approach 2:
The patent controls gas flow by changing fluid dynamic parameters (pressure, flow rate) rather than relying on precise mechanical positioning. The fluidic amplifier modulates flow based on pressure differential created during patient inhalation, achieving precise control through parameter modulation instead of mechanical adjustment.
3Ease of operation
If conventional continuous nebulization is used to ensure medication availability, then patient comfort is improved, but significant medication is wasted into the environment when the patient is not inhaling
Solution Approach 1:
The patent implements periodic (intermittent) nebulization that activates only during patient inhalation cycles. The fluidic control system responds to the periodic nature of breathing by triggering nebulization during inhalation phases and stopping during exhalation phases, thereby eliminating continuous medication waste while maintaining patient comfort.
Solution Approach 2:
The system uses the patient's own breath as feedback to control nebulization timing. The negative pressure generated during inhalation is detected by the fluidic amplifier, which automatically triggers the nebulization cycle, ensuring medication is delivered only when the patient is actively inhaling without requiring external control.
4Reliability
If a fluidic amplifier with multiple ports and control mechanisms is used to eliminate moving parts, then reliability is improved by preventing sticking, but the device complexity increases
Solution Approach 1:
The patent trades mechanical complexity for fluidic complexity, replacing a simple mechanical diverter with a more complex but mechanically-free fluidic amplifier system. The fluidic circuit uses gas flow paths, pressure differential, and port configuration to achieve control functions that would otherwise require mechanical components, thereby improving reliability by eliminating sticking issues.
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 system enables efficient and consistent medication delivery with reduced waste, improved patient comfort by minimizing resistance during inhalation, and simplifies the design and maintenance by eliminating the need for complex movable parts.
Implementation Method 1
a fluidic amplifier configured to control the delivery of the control gas to the control conduit based on inhalation by the patient
Implementation Method 2
when the pressurized gas passes over the reservoir or the orifice, a negative pressure is created in the vicinity of the outlet, causing the liquid medication to be drawn out of the reservoir and entrained into the stream of pressurized gas
Implementation Method 3
causing the liquid medication to be drawn out of the reservoir and entrained into the stream of pressurized gas
Implementation Method 4
The stream of pressurized gas with entrained liquid medication forms aerosol particles that are suspended within the nebulizer for inhalation by a patient
Data Source
AI summary
Various embodiments of a breath-activated nebulizer with fluidic control and related methods of using such a nebulizer are disclosed. The nebulizer may include a body comprising a reservoir for holding medication, a nozzle for emitting a jet of pressurized gas, and a fluid conduit in communication with the reservoir for delivery of the medication proximate the jet to produce an aerosol of medication. The nebulizer may also include a nebulizer outlet in communication with an interior of the body for delivery of the aerosol to a patient, a control conduit in fluid communication with the fluid conduit for delivery of a control gas to the fluid conduit to prevent the delivery of the medication proximate the jet, and a fluidic amplifier configured to control the delivery of the control gas to the control conduit.