Pressure safely 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-11628269-B2
Publication Date
2023-04-18
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
A pressure safety device is provided for use with a bag valve mask (BVM) having a bag assembly with a bag connector configured to detachably mate to a mask connector on a patient mask. The pressure safety device includes a housing having a bag port, a mask fitting, and a flow path from the bag port to the mask fitting, with the bag port and mask fitting configured to detachably connect to the BVM bag connector side and BVM mask connector side, respectively. The housing and flow path are configured so that an automatic flow reduction valve located in the flow path impedes flow when a pressure or flow rate on the bag connector side exceeds a maximum threshold value.
The automatic flow reduction valve comprises a deformable seal having an open position and a closed position. 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, with the deformable seal in an unstressed configuration in the open position and in a stressed configuration in the closed position. The deformable seal comprises a conical periphery configured to evert from the unstressed configuration to the stressed configuration in response to the pressure or flow rate exceeding the maximum threshold value.
In some embodiments, the pressure safety device further includes a one-way valve arrangement to prevent patient exhalation from returning to the BVM by diverting exhalation flow, and housing fenestrations configured to vent the diverted or blocked exhalation flow to the exterior. The automatic flow reduction valve is described as comprising an umbrella valve including a support plate with flow openings, where the deformable seal is coupled to the support plate and positioned above the flow openings in the open position to cover the flow openings in the closed position, thereby fully sealing the openings when the maximum threshold is exceeded.
Claims Coverage
The document includes four independent claims. Across these claims, the inventive subject matter is organized around maximum-threshold-triggered fully blocking of a flow path using a deformable seal that transitions between unstressed open and stressed closed configurations with a conical periphery that everts.
BVM pressure safety device with maximum-threshold flow blocking valve
A pressure safety device for use with a bag valve mask (BVM) comprising a housing having a bag port, a mask fitting, and a flow path from the bag port to the mask fitting, and an automatic flow reduction valve located in the flow path configured to impede flow when a pressure or flow rate on a bag connector side exceeds a maximum threshold value.
Deformable seal that everts conical periphery from open to fully block flow path
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, with an unstressed configuration in the open position and a stressed configuration in the closed position, and wherein the deformable seal comprises a conical periphery configured to evert from the unstressed configuration to the stressed configuration in response to the pressure or flow rate exceeding the maximum threshold value.
BVM modification by connecting PSD bag port and mask fitting to BVM connectors
A method for modifying a bag valve mask (BVM) including 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, wherein the PSD is configured to impede breathing gas flow from the BVM to the breathing mask when a pressure or flow rate entering the bag port exceeds a maximum threshold value.
Umbrella valve structure with conical evertable deformable seal over flow openings
The PSD comprises an umbrella valve including a support plate with flow openings therethrough, wherein the deformable seal is coupled to the support plate, wherein the deformable seal has a conical periphery and is positioned above the flow openings in the open position and covers the flow openings in the closed position, and wherein the conical periphery is configured to evert to fully seal the openings in response to the pressure or flow rate exceeding the maximum threshold value.
BVM assembly with automatic flow reduction valve in manifold flow path
A bag valve mask (BVM) assembly comprising a manifold, a compression bag attached to deliver a breathing gas to the manifold, a breathing mask attached to receive the breathing gas from the manifold, and an automatic flow reduction valve located on a flow path in the manifold between the compression bag and the breathing mask, configured to impede flow when a flow rate or a pressure on the compression bag side exceeds a maximum threshold value, wherein the valve comprises a deformable seal having an open position and a closed position configured to deform to fully block the flow path in response to exceeding the maximum threshold value, with an unstressed open configuration and a stressed closed configuration and a conical periphery configured to evert to fully block the flow path.
Gas delivery with fully blocking flow by deforming seal upon exceeding maximum threshold
A method for delivering a breathing gas to a patient comprising placing a breathing mask over the patient's mouth and/or nose, manually compressing a compression bag to deliver a flow of the breathing gas along a flow path to the breathing mask and to the patient, and fully blocking the flow of the breathing gas if a pressure or flow rate from the breathing bag resulting from manually compressing the compression bag exceeds a maximum threshold value, wherein fully blocking comprises deforming a deformable seal from an open position to a closed position to fully block the flow path in response to the pressure or flow rate exceeding the maximum threshold value, with an unstressed configuration in the open position and a stressed configuration in the closed position and an umbrella valve comprising a support plate with flow openings and a deformable seal coupled to the support plate with a conical periphery positioned above the flow openings in the open position and covering the flow openings in the closed position, with the conical periphery configured to evert to fully seal the openings upon exceeding the maximum threshold value.
Across the independent claims, the coverage centers on a PSD/BVM arrangement where an automatic flow reduction valve impedes flow when a pressure or flow rate exceeds a maximum threshold, and where a deformable seal transitions from an unstressed open position to a stressed closed position to fully block the flow path, implemented with a conical periphery that everts. Dependent aspects further recite umbrella valve structure with a support plate and flow openings, and include one-way valve diversion of exhalation flow with housing fenestrations for venting to the exterior.
Stated Advantages
Prevents or impedes over-limit breathing gas flow by blocking flow when pressure or flow rate exceeds a maximum threshold value.
Fully blocks the flow path using a deformable seal that transitions from an open position to a closed position in response to exceeding the maximum threshold value.
Diverts exhalation flow to prevent patient exhalation from returning to the BVM, with venting of diverted exhalation flow to the exterior.
Provides fully sealing of flow openings when the maximum threshold is exceeded via the conical periphery that everts.
Documented Applications
Use of a pressure safety device with a bag valve mask (BVM) by inserting the PSD between the BVM manifold/connector port and the breathing mask connector fitting, with the PSD impeding flow when bag-side pressure or peak flow exceeds a maximum threshold value.
Modifying a bag valve mask (BVM) by connecting a pressure safety device (PSD) with a bag port and a mask fitting and a flow path to the bag connector and mask connector of the BVM, such that the PSD impedes breathing gas flow to the breathing mask when the pressure or flow rate entering the bag port exceeds a maximum threshold value.
A bag valve mask (BVM) assembly with an automatic flow reduction valve located in the manifold between the compression bag and the breathing mask, configured to impede flow when the compression bag side pressure or flow rate exceeds a maximum threshold value.
Delivering breathing gas to a patient by placing a breathing mask over the patient's mouth and/or nose and manually compressing a compression bag, with fully blocking of the flow when pressure or flow rate resulting from manual compression exceeds a maximum threshold value.
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