Breath-Actuated Nebulizer with Movable Baffle
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Solution Overview
Problem
Conventional nebulizers waste medication by continuously aerosolizing drugs regardless of patient inhalation, leading to inaccurate dosing and potential exposure risks for caregivers and others, especially with expensive or toxic medications.
Innovation Solution
A breath-triggered gas jet nebulizer with a movable baffle that only nebulizes during inhalation, using a Venturi effect and a diaphragm to control the baffle's position over the Venturi jet, ensuring nebulization occurs only when the patient is inhaling and ceases when they exhale.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous aerosolization is used, then the device operates continuously and consistently, but medication is wasted and dosing becomes inaccurate
Solution Approach 1:
The nebulizer operates periodically based on patient breathing cycles rather than continuously. The breath-actuated mechanism triggers aerosolization only during inhalation phases, creating on-demand periodic operation that eliminates medication waste while maintaining therapeutic effectiveness.
Solution Approach 2:
The device uses the patient's own breathing action to trigger and control nebulization. The breath-actuated mechanism automatically activates aerosol generation during inhalation without requiring external control, making the system self-regulating based on patient needs.
2Reliability
If continuous aerosolization is used, then the Venturi operates continuously, but exposure risks increase for caregivers and others
Solution Approach 1:
Aerosol generation occurs only during patient inhalation cycles rather than continuously. This periodic operation dramatically reduces environmental exposure of medicated aerosol to caregivers and others while maintaining reliable drug delivery during actual breathing events.
Solution Approach 2:
The patient's breathing automatically controls aerosol generation timing. The breath-actuated mechanism ensures aerosol is produced only when the patient needs it, inherently limiting exposure risk without requiring external monitoring or control systems.
3Measurement precision
If a movable baffle is added to control nebulization timing, then dosing precision improves, but device complexity increases
Solution Approach 1:
The movable baffle acts as an intermediary element that controls aerosol flow timing. It is positioned by the patient's breath pressure to allow or block aerosol passage, providing precise dosing control through a simple mechanical intermediary rather than complex electronic control systems.
Solution Approach 2:
The device uses pneumatic pressure from the patient's breath to actuate the movable baffle. This pneumatic actuation mechanism provides precise timing control for dosing accuracy while avoiding complex mechanical or electronic actuation systems.
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
This design minimizes drug wastage and allows for precise dosing by synchronizing nebulization with the patient's breathing, reducing exposure risks and improving medication delivery efficiency.
Implementation Method 1
a jet of pressurized gas (air or other suitable gas, such as medical oxygen) is directed over an orifice on a capillary that is connected to a reservoir containing a drug in aqueous solution. The Venturi creates a localized low pressure zone that draws the drug solution out of the capillary orifice and into the air jet, where the liquid is atomized by a shearing effect
Implementation Method 2
Within the body is a shaft integrated with a baffle and diaphragm that moves horizontally in response to the breathing of a patient. When the patient is inhaling the diaphragm flexes shifting the baffle toward the patient and over the Venturi
Data Source
AI summary
A breath actuated nebulizer for administration of an inhaled medication to a patient is provided with a generally cylindrical body in a horizontal orientation to the patient. Within the body is a Venturi configured to nebulizer a liquid medication in a reservoir. Within the body is a shaft integrated with a baffle and diaphragm that slides horizontally in response to the breathing of a patient. During inhalation by the patient, the diaphragm flexes shifting the baffle over the Venturi, allowing nebulization to occur. When the patient exhales, the diaphragm flexes to a default position in which the baffle is distal to the Venturi, thereby stopping the nebulization. The diaphragm is biased to rest in this default position until the patient inhales again.