Pressure adjustment apparatus and method

An inflatable cuff system, comprising:

• a tube defining a lumen therein;
• a pump including a pump body that defines a variable volume therein, the pump body further defining a first aperture and a second aperture therethrough, such that the first aperture and the second aperture of the pump body are in fluid communication with the variable volume;
• a selector valve coupled to the pump and the tube, the selector valve defining a plurality of fluid channels therethrough, the selector valve including
• a first check valve disposed in a first fluid channel of the plurality of fluid channels, the first check valve being oriented to permit flow through the first fluid channel only in a first flow direction, the first flow direction being a flow direction out of the variable volume, and
• a third check valve disposed in a third fluid channel of the plurality of fluid channels, the third check valve being oriented to permit flow through the third fluid channel only in a second flow direction, the second flow direction being a flow direction into the variable volume;
• and
• an inflatable cuff in fluid communication with the pump via the selector valve and the lumen,
• wherein, when the selector valve is oriented in a first position relative to the pump, the first aperture of the pump body is in fluid communication with the first fluid channel of the selector valve, thereby permitting a flow from the variable volume of the pump into the inflatable cuff through the first fluid channel, and
• wherein, when the selector valve is oriented in a second position relative to the pump, the first aperture of the pump body is in fluid communication with the third fluid channel of the selector valve, thereby permitting a flow from the inflatable cuff into the variable volume of the pump through the third fluid channel.

A method of adjusting a pressure in a system, the system including a pump fluidly coupled to a chamber through a selector valve, the pump having a pump body that defines a variable volume therein, the pump body further defining a first aperture and a second aperture therethrough, the first aperture and the second aperture being in fluid communication with the variable volume, the method comprising:

• orienting the selector valve to a first position of a plurality of positions relative to the pump;
• flowing a first fluid from the variable volume into a first flow channel of the selector valve via a first check valve by decreasing a volume of the variable volume;
• and
• flowing a second fluid from a fluid source into a second flow channel of the selector valve via a second check valve by increasing the volume of the variable volume,
• wherein the second flow channel is separate from the first flow channel.