发明名称 |
Gas mixing apparatus for a ventilator |
摘要 |
The gas mixing apparatus provides the components of a breathing gas for mixing at approximately ambient atmospheric pressure, and regulates the pressure of a selected gas to approximately ambient atmospheric pressure for mixing with air at ambient atmospheric pressure. The gas mixing apparatus includes a piston disposed within a pump chamber. A flow limiting inlet controls introduction of a first selected gas such as oxygen for mixing with a second selected gas such as air. The pressure of the first selected gas is limited to an acceptable maximum pressure, so that even if a valve for admitting the first selected gas for mixing at ambient pressure fails, breathing gas will not be provided at an excessive pressure. A demand valve is alternatively provided for reducing the pressure of the first selected gas supplied before mixing, but a pressure sensor is also provided downstream of the demand valve for detecting failure of the demand valve, to shut off the supply of the first selected gas to prevent overpressurization. |
申请公布号 |
US6116240(A) |
申请公布日期 |
2000.09.12 |
申请号 |
US19990277528 |
申请日期 |
1999.03.26 |
申请人 |
PURTIAN-BENNETT CORPORATION |
发明人 |
MERRICK, EDWIN B.;GEE, GLEN N.;O'MAHONY, JOHN;O'DEA, JOHN |
分类号 |
A61M16/00;A61M16/12;A61M16/20;(IPC1-7):A61M16/00;A62B7/00 |
主分类号 |
A61M16/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|