Resuscitation Bag Gas Control Unit with Dual Flow Restrictions
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Solution Overview
Problem
Conventional resuscitation bag systems for cardiac arrest have limited autonomy due to high oxygen consumption, typically lasting less than 30 minutes with standard oxygen cylinders, which is insufficient for prolonged cardiac massages.
Innovation Solution
The resuscitation bag system incorporates a gas control unit with dual flow restriction means and a monitoring module to adjust oxygen flow rates, allowing for a high flow rate during initial denitrogenation and a low flow rate for sustained oxygen delivery, reducing overall oxygen consumption and extending autonomy without increasing cylinder size or weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high flow rate of oxygen (15 L/min) is delivered to ensure 100% oxygen concentration during cardiac resuscitation, then the oxygenation effectiveness is improved, but the oxygen cylinder autonomy is reduced to less than 30 minutes
Solution Approach 1:
The system dynamically switches between two flow rates (15 L/min and 0.5 L/min) based on operational phase. During initial denitrogenation, high flow rate is used to rapidly replace nitrogen with oxygen. During sustained resuscitation, low flow rate maintains oxygenation while conserving cylinder supply, extending autonomy from <30 minutes to >1 hour
Solution Approach 2:
The system implements periodic high-flow insufflations interspersed with low-flow periods. The gas control unit delivers 15 L/min during brief insufflation phases to flush nitrogen from airways, then reduces to 0.5 L/min for extended periods, creating a rhythmic pattern that maintains effectiveness while reducing overall consumption
2Weight of moving object
If a first rescuer carries a standard oxygen cylinder (D cylinder, 425 L, 4 kg) to the emergency place, then the portability is improved, but the autonomy is insufficient for prolonged cardiac massages (up to 1 hour or more)
Solution Approach 1:
The system changes the flow rate parameter from a constant 15 L/min to a variable parameter with two distinct levels (15 L/min and 0.5 L/min). This parameter change reduces the total oxygen volume consumed from 425 L to approximately 60 L or less over the course of resuscitation, allowing standard cylinders to provide sufficient autonomy without increasing weight
3Reliability
If oxygen flow is continuously set at 15 L/min to maintain 100% oxygen concentration, then the oxygen concentration reliability is improved, but the oxygen consumption increases dramatically
Solution Approach 1:
The monitoring module continuously detects oxygen concentration in the resuscitation bag and provides feedback to the gas control unit. When concentration drops below threshold during insufflation, the system increases flow to 15 L/min. When concentration is maintained during sustained phase, the system reduces flow to 0.5 L/min, creating a feedback-controlled system that maintains reliability while minimizing consumption
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 solution enables extended cardiac massage support for up to 1 hour or more with reduced oxygen usage, ensuring a consistent 100% oxygen concentration, thereby improving patient care during prolonged resuscitation efforts.
Implementation Method 1
the first conduct comprising first flow restriction means configured for limiting the gas flow to a first flow rate, and the second conduct comprising second flow restriction means configured for limiting the gas flow to a second flow rate
Data Source
AI summary
A resuscitation bag system (1) useable for resuscitating a person in cardiac arrest, and having a gas control unit (90) with a first valve (92) fluidly connected to a first (922) and to a second conduit (923), the first (922) and second conduits (923) being arranged in parallel and further fluidly connected to the first conduit element (56), the first conduit (922) having a first flow restriction (924) configured for limiting the gas flow to a first flowrate, and the second conduit (923) comprising second flow restriction (925) configured for limiting the gas flow to a second flowrate, with the second flowrate being less than the first flowrate.