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-11690650-B2
Publication Date
2023-07-04
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 disclosure relates to an improved Odon-type birth assistance extraction device comprising an inflatable section and a pump arrangement for applying pressure to the inflatable section. The birth assistance device is configured to be connected to a pump via a conduit, and the pump is provided as a pressure limited pump for operating with the birth assistance device when attached via the conduit.
A pressure limitation apparatus is described in which the pump includes a central chamber for receiving and containing a gas. The central chamber includes a compressible portion and an incompressible portion, and the compressible portion and incompressible portion remain in fluid communication. First and second check valves are provided so that one valve allows air to pass into the central chamber and prevents back flow out, while the other valve allows air to pass out of the central chamber and prevents back flow into the central chamber.
The ratio of the incompressible volume and the compressible volume defines a pressure of the air passing through the second check valve. Compressing the compressible portion of the central chamber causes air to flow into the inflatable section to inflate it with a pressure limited pump action. In this way, the apparatus enables limitation of excessive pressures during inflation and air withdrawal, without requiring user monitoring to achieve pressure limitation.
Claims Coverage
1 independent claim is provided. The claim defines a pressure limitation apparatus operating with a birth assistance device through a conduit, where a pressure limited pump with a central chamber split into compressible and incompressible portions uses check valves so the ratio of volumes defines the pressure applied to inflate the inflatable section.
Pressure limited pump defining pressure from compressible and incompressible volume ratio
A central chamber having a compressible portion and an incompressible portion in fluid communication, wherein a ratio of the incompressible volume and the compressible volume defines a pressure of the air passing through the second check valve.
First and second check valves preventing back flow
A first check valve allowing air to pass therethrough and into the central chamber and preventing back flow of air out of the central chamber, and a second check valve allowing air to pass therethrough and out of the central chamber and preventing back flow of air into the central chamber.
Inflating the inflatable section by compressing the compressible portion
Compressing the compressible portion of the central chamber such that air flows into the inflatable section of the birth assistance device to apply positive pressure and inflate the inflatable section.
The independent claim centers on a pressure limited pump whose central chamber includes compressible and incompressible portions connected in fluid communication and controlled by first and second check valves. By defining the pressure via the compressible and incompressible volume ratio, the claim inflates the inflatable section by compressing the compressible portion so air flows into the inflatable section.
Stated Advantages
Reduces device complexity by providing pressure limitation without user monitoring.
Limits excessive pressures during inflation and air withdrawal.
Documented Applications
Operating a pressure limitation apparatus configured to operate with a birth assistance device (Odon-type birth assistance extraction device) when attached via a conduit, including applying positive pressure to inflate an inflatable section.
Withdrawal of air associated with operation of the pressure limited pump with a birth assistance device.
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