Ventilator Nebulizer Bypass Valve for Uninterrupted Inhalation Dosing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Challenges in administering nebulized drugs to patients on a mechanical ventilator include inefficient drug delivery, variability in delivery, interference from humidification, and interruptions in breathing due to nebulizer refilling or cleaning.
Innovation Solution
A ventilator circuit design that minimizes the influence of inhalation-exhalation ratio, bias flow, and humidification by using a breath-actuated nebulizer with a pressure sensor, allowing nebulization only during inspiration, and enabling nebulizer removal without interrupting breathing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If humidification is applied during nebulization, then breathing gases are properly humidified for the patient, but drug delivery efficiency decreases and dosing becomes unpredictable
Solution Approach 1:
The circuit is divided into separate functional segments: a humidification segment (humidifier on the expiratory limb) and a nebulization segment (nebulizer on the inspiratory limb). This segmentation allows humidification to occur independently from nebulization, eliminating the interference between these two processes while maintaining both functions simultaneously
Solution Approach 2:
The expiratory limb serves as an intermediary pathway that carries humidified gases from the patient's exhaled breath back to the humidifier, which then conditions these gases before they can be reused or vented. This intermediary system allows humidification without directly interfering with the nebulization process on the inspiratory limb
2Ease of repair
If the nebulizer is removed for refilling or cleaning, then maintenance tasks can be performed, but patient breathing is interrupted
Solution Approach 1:
The nebulizer is extracted as a separate, independently removable component from the main breathing circuit. It is positioned on the inspiratory limb with dedicated connections that allow it to be detached without affecting the expiratory limb or the patient's breathing pathway. This extraction enables maintenance of the nebulizer while the breathing circuit remains intact and functional
Solution Approach 2:
The circuit design incorporates dynamic connectivity where the nebulizer can be dynamically connected or disconnected from the inspiratory limb without requiring shutdown of the entire system. The breathing circuit adapts its configuration based on whether the nebulizer is attached, allowing seamless transition between operational and maintenance states
3Quantity of substance
If nebulization occurs continuously, then drug delivery is maintained, but drug loss increases and dosing precision decreases
Solution Approach 1:
Nebulization is implemented as a periodic, breath-synchronized process rather than continuous operation. The nebulizer activates only during specific phases of the breathing cycle (inspiration or expiration), delivering drug doses that are timed to coincide with patient breaths. This periodic action reduces overall drug consumption while maintaining effective dosing, as the drug is delivered only when the patient is breathing and can receive it
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
Enhances drug delivery to the lungs, reduces nebulizer interruptions, and maintains consistent dosing by ensuring nebulization occurs only during inhalation, thus improving patient care efficiency.
Implementation Method 1
a pressure sensor interposed between the nebulizer and the ventilator, wherein the pressure sensor controls a pressurized air supply to the nebulizer required for nebulization to occur, such that nebulization only occurs during a pressure increase on the inspiratory limb caused by an increase in air pressure from the ventilator to force an inhalation by the patient
Implementation Method 2
a nebulizer on the inspiratory limb interposed between a T-fitting and a three-way valve such that the nebulizer can be removed from the inspiratory limb without interrupting the flow of breathing gases to the patient
Data Source
AI summary
A ventilator circuit apparatus is provided for the administration of an aerosolized drug from a nebulizer through an endotracheal tube to a patient on a mechanical ventilator with humidification of the breathing gases. Means to disconnect the nebulizer without interrupting the airflow to the patient is provided, with a T-fitting and three-way valve in the ventilator circuit that permits the nebulizer to be bypassed by the airflow, allowing the nebulizer to be removed from the apparatus without interrupting the flow of breathing gases to the patient. In embodiment, the nebulizer is breath-enhanced jet nebulizer. In an embodiment, the jet nebulizer is breath-actuated, by the use of an air pressure sensor that toggles the flow of pressurized air to the nebulizer that drives the jet required for nebulization.