Apparatus for extraction of at least one element from a cavity and a pressure limitation apparatus
Inventors
KOH, Chong Yong • Cheng, Kiat Jin
Assignees
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Publication Number
US-11097992-B2
Publication Date
2021-08-24
Expiration Date
Abstract
There is provided an apparatus for extraction of at least one object from a cavity. The apparatus includes a sleeve including an inflatable section configured to surround the at least one object during inflation; a handle configured to enable a user to hold the sleeve, the handle defining a holding edge of an opening at a first portion of the sleeve; and a handle-mount mounted to a peripheral area around the opening, the handle-mount being for attachment of a pump used for inflating the inflatable section. There is also provided a pressure limitation apparatus configured to operate with a birth assistance device when attached via a conduit.
Core Innovation
The disclosed invention relates to a pressure limitation apparatus configured to operate with a birth assistance device when attached via a conduit. The apparatus supplies either a positive pressure to inflate an inflatable section or a negative pressure to withdraw air from within a suction cup of the birth assistance device. The apparatus includes a central chamber for containing a gas and first and second check valves arranged to allow controlled gas flow into and out of the central chamber while preventing back flow.
The central chamber includes a first compressible portion and a second incompressible portion that remain in fluid communication. A ratio of the incompressible volume and the compressible volume defines a pressure of the air passing through the second check valve. This relationship is used to provide pressure limitation so that the pressure delivered to an inflatable section or the suction cup is limited based on the defined volume ratio.
The disclosed embodiments include configurations where the compressible portion is implemented in different ways while maintaining fluid communication, including an internal partition, an external restrictor, or a sub-chamber. Further embodiments add an air chamber arranged to receive or supply air through one of the check valves. The pressure limitation apparatus may be implemented with a bulb pump or an axial pump.
Claims Coverage
The partial content includes two independent claims. Each independent claim defines a pressure limitation apparatus using a central chamber with first and second check valves, where a defined ratio of incompressible volume and compressible volume sets the pressure passing through the second check valve.
Pressure limitation apparatus for positive pressure inflation
A pressure limitation apparatus configured to operate with a birth assistance device when attached via a conduit to supply a positive pressure to inflate an inflatable section, including a central chamber for containing a gas; a first check valve allowing air to pass into the central chamber and preventing back flow out; a second check valve allowing air to pass out and preventing back flow in; the central chamber includes a first compressible portion with a compressible volume and a second incompressible portion with an incompressible volume; the first compressible portion and the second incompressible portion remain in fluid communication; and a ratio of the incompressible volume and the compressible volume defines a pressure of the air passing through the second check valve.
Pressure limitation apparatus for negative pressure suction
A pressure limitation apparatus configured to operate with a birth assistance device when attached via a conduit to supply a negative pressure to withdraw air from within a suction cup, including a central chamber for containing a gas; a first check valve allowing air to pass into the central chamber and preventing back flow out; a second check valve allowing air to pass out of the central chamber and preventing back flow in; the central chamber includes a compressible portion having a compressible volume and an incompressible portion having an incompressible volume; the compressible portion and the incompressible portion remain in fluid communication; and a ratio of the incompressible volume and the compressible volume defines a pressure of the air passing through the second check valve.
Across both independent claims, pressure limitation is achieved by a central chamber split into compressible and incompressible portions that remain in fluid communication, with the pressure of air passing through the second check valve defined by a ratio of incompressible volume to compressible volume. The difference between the claims is whether the apparatus supplies positive pressure to inflate an inflatable section or negative pressure to withdraw air from a suction cup.
Stated Advantages
Not explicitly described in patent.
Documented Applications
Not explicitly described in patent.
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