| 摘要 |
<p>This invention is a vacuum system and a method of operating a vacuum system (10). The system comprises a vacuum line (12), a pump (14), a pump motor (16), a pressure adjusting assembly (20), a pressure sensor (22), and a control means (24). The pump is connected to the vacuum line for drawing fluids therefrom, and the motor is connected to the pump to drive the pump. The pressure adjusting assembly is connected to the vacuum line for conducting fluid into that line at an adjustable rate. The pressure sensor is connected to the vacuum line to generate a pressure signal representing the pressure in the vacuun line. The control means receives the pressure signal and generates a system control signal that is used to adjust the pressure in the vacuum line. The specific manner in which the pressure in the vacuum line is adjusted depends on the value of that pressure, and in particular whether that pressure is in a first range or a second range. If the pressure in the vacuum line is in the first range, the pressure in the vacuum line is adjusted by varying the amount of fluid conducted into that line through the pressure adjusting assembly. If the pressure is within the second pressure range, the pressure in the fluid line is adjusted by varying the speed of the pump. The vacuum system is well suited for use during ophthalmic surgery to aspirate the surgical site.</p> |
