Dual-Path Oxygen Feed for Handheld Resuscitation Bags
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Solution Overview
Problem
Current bag valve mask systems waste a significant amount of oxygen by the time it reaches the patient due to dilution, necessitating a more efficient delivery system.
Innovation Solution
A resuscitation system with a check valve to block gas flow upstream and allow flow downstream, supplemented by a second gas inlet for oxygen on the patient side of the check valve, and safety release valves to manage pressure, along with a PEEP valve and biological filter to enhance oxygen delivery and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If oxygen is provided on the bag side of the one-way valve, then the system structure is simple, but oxygen is diluted and wasted by the time it reaches the patient
Solution Approach 1:
The system divides the gas flow path into two separate segments: (1) bag-side oxygen inlet for initial oxygen supply, and (2) patient-side second gas inlet for supplemental oxygen delivery downstream of the check valve. This segmentation allows oxygen to be delivered at two different locations, preventing dilution and waste while maintaining manageable system complexity through modular component arrangement.
Solution Approach 2:
A second gas inlet is introduced as an intermediary component downstream of the check valve and PEEP valve. This intermediary allows supplemental oxygen to be delivered directly into the breathing circuit near the patient, bypassing the dilution issue in the bag-side delivery system. The check valve and PEEP valve act as mediators that control the flow and pressure of oxygen from both inlets.
2Productivity
If pressure is increased to deliver more oxygen to the patient, then oxygen delivery efficiency improves, but risk of over-pressurization and lung damage increases
Solution Approach 1:
A check valve is installed downstream of the bag outlet to preliminarily control gas flow direction before oxygen reaches the patient. This ensures unidirectional flow and prevents backflow that could cause over-pressurization. Additionally, a PEEP valve is positioned upstream of the second gas inlet to preliminarily regulate pressure levels, allowing supplemental oxygen to be delivered at controlled pressure differentials.
Solution Approach 2:
The PEEP (Positive End Expiratory Pressure) valve provides continuous feedback control by automatically regulating pressure in the breathing circuit. When pressure exceeds the PEEP setting, the valve opens to release excess pressure, maintaining optimal pressure levels for oxygen delivery while preventing barotrauma to the patient's lungs.
3Reliability
If safety release valves are added to prevent over-pressurization, then patient safety improves, but device complexity increases
Solution Approach 1:
The check valve and PEEP valve are integrated into a unified valve assembly that combines multiple safety functions in one compact unit. The check valve prevents backflow while the PEEP valve regulates pressure, and both can be positioned upstream of the second gas inlet. This merging reduces the number of separate components and simplifies the overall system architecture while maintaining comprehensive safety functionality.
Solution Approach 2:
The valve assembly serves multiple functions simultaneously: (1) check valve function for unidirectional flow control, (2) PEEP function for pressure regulation, and (3) integration point for both oxygen inlets. This multi-functionality reduces the need for separate dedicated components for each safety function, thereby improving patient safety without proportionally increasing device complexity.
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 effectively delivers enriched oxygen to the patient while preventing over-pressurization and contamination, ensuring efficient ventilation and lung protection.
Implementation Method 1
a check valve operably connected to the gas outlet of the resuscitation bag and substantially blocking gas flow upstream of the valve and back into the back and only allowing gas flow downstream of the valve toward the patient
Implementation Method 2
a first safety release valve operably located downstream of the resuscitation bag and operable to release gas from the gas flow path at a predetermined pressure differential between the path and ambient air
Implementation Method 3
The biological filter prevents particles from the patient's exhaled breath from entering the atmospheric air
Data Source
AI summary
A resuscitation system including a hand held collapsible resuscitation bag having a bag body, an air inlet and an outlet couplable with a face mask. A first fluid path having a distal outlet within an airflow path near the bag outlet and a proximal end having a fitting connectable to an enhanced oxygen source and a second fluid path having a distal end within the airflow path located further upstream from the bag outlet than the first fluid path distal outlet, the second fluid path having a proximal end having a fitting connectable to an enhanced oxygen source. The first fluid path is defined within a first tube and the second fluid path is defined within a second tube.