Pressure safety device for bag valve mask
Inventors
Prabhudesai, Prathamesh P. • Shekhani, Haris • Tirdea, Iordache F. • Alam, Nadia • Bhowmick, Amrita • Gupta, Ananya • Meng, Liuyi
Assignees
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Publication Number
US-12017008-B2
Publication Date
2024-06-25
Expiration Date
Abstract
A pressure safety device is used with a bag valve mask (BVM) for preventing over-pressurization. The BVM includes a bag assembly having a bag connector for detachably mating to a mask connector on a patient mask. The pressure safety device has a housing with a bag port, a mask fitting, and a flow path from the bag port to the mask fitting. The bag port detachably connects to the bag connector on the BVM, and the mask fitting detachably connects to the mask connector on the BVM. The pressure safety device includes an automatic flow reduction valve located on the flow path in the housing and impedes flow when pressure on a bag connector side of the valve exceeds a maximum threshold value.
Core Innovation
The invention provides a pressure safety device (PSD) for a bag valve mask (BVM) having a bag assembly with a bag connector detachably mating to a mask connector on a patient mask. The PSD inserts between the bag connector and the patient mask connector and includes a housing with a bag port, a mask fitting, and a flow path from the bag port to the mask fitting.
The PSD is configured to impede breathing gas flow from the BVM to the breathing mask when a pressure or flow rate of the breathing gas entering the bag port exceeds a maximum threshold value. The PSD includes a deformable seal having an open position and a closed position, where the deformable seal deforms to fully block the flow path in response to the pressure or flow rate exceeding the maximum threshold value.
The invention further includes mechanical valve embodiments for the automatic flow reduction, including a deformable seal having an umbrella conical seal with a support plate and an associated duckbill one-way valve, and a spring-loaded valve with a seal plate. In addition, exhalation is handled using an arrangement that includes a one-way valve and fenestrations to vent diverted exhalation flow and enable PEEP adjustment.
Claims Coverage
The document includes two independent claims: one directed to a method for modifying a bag valve mask (BVM) by connecting a pressure safety device (PSD), and one directed to a BVM assembly with an automatic flow reduction valve. Both independent claims share the core inventive concept that a deformable-seal-based valve impedes or fully blocks inspiratory flow when pressure or flow rate on the bag side exceeds a maximum threshold value.
Psd between bag connector and mask connector with bag port-to-mask fitting flow path
Providing a pressure safety device (PSD) having a bag port and a mask fitting and a flow path from the bag port to the mask fitting, and connecting the bag port and the mask fitting of the PSD to the bag connector and the mask connector of the BVM, respectively.
Automatic flow reduction based on maximum threshold pressure or flow rate
The PSD is configured to impede breathing gas flow from the BVM to the breathing mask when a pressure or flow rate of the breathing gas entering the bag port of the PSD exceeds a maximum threshold value.
Deformable seal switching open and closed positions to fully block the flow path
The PSD comprises a deformable seal having an open position and a closed position, wherein the deformable seal is configured to deform to fully block the flow path in response to the pressure or flow rate exceeding the maximum threshold value.
Automatic flow reduction valve in manifold between compression bag and breathing mask
An automatic flow reduction valve located on a flow path in the manifold between the compression bag and the breathing mask, said automatic flow reduction valve being configured to impede flow when a flow rate or a pressure on the compression bag side of the automatic flow reduction valve exceeds a maximum threshold value.
Deformable seal of the automatic flow reduction valve blocks flow path upon exceeding the maximum threshold
The automatic flow reduction valve comprises a deformable seal having an open position and a closed position wherein the deformable seal is configured to deform to fully block the flow path in response to the pressure or flow rate exceeding the maximum threshold value.
Overall, the claim set covers a PSD for connecting between BVM connectors and a BVM assembly with a manifold-located automatic flow reduction valve. In both cases, a deformable seal transitions between open and closed positions to fully block the flow path when a maximum threshold pressure or flow rate is exceeded.
Stated Advantages
Reduces risks of over-pressurization and gastric insufflation by providing flow reduction when upstream bag-side pressure/flow exceeds a maximum threshold.
Documented Applications
Used as a pressure safety device (PSD) for a bag valve mask (BVM) by inserting between the BVM bag connector and patient mask connector to impede breathing gas flow when pressure or flow rate exceeds a maximum threshold.
Modified BVM breathing gas delivery in which inspiratory flow is reduced when the pressure or flow rate entering the bag port exceeds a maximum threshold to reduce over-pressurization and gastric insufflation risk.
Handles exhalation by venting diverted exhalation flow using a one-way valve and fenestrations and enabling PEEP adjustment.
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