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A pressurized infusion device has a flexible band with first and second ends, a curved base, and a bag containing fluid. The bag is located between the flexible band and the curved base. The second end of the flexible band is coupled to a shaft. A motor is also coupled to the shaft. The motor is act

A pressurized infusion device has a flexible band with first and second ends, a curved base, and a bag containing fluid. The bag is located between the flexible band and the curved base. The second end of the flexible band is coupled to a shaft. A motor is also coupled to the shaft. The motor is actuated to turn the shaft and produce tension in the band thereby changing the fluid pressure in the bag.

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What is claimed is: 1. A pressurized infusion device for an ophthalmic surgical machine, the pressurized infusion device comprising: a flexible band having first and second ends; a curved base; a bag containing irrigating fluid, the bag located between the flexible band and the curved base; an irri

What is claimed is: 1. A pressurized infusion device for an ophthalmic surgical machine, the pressurized infusion device comprising: a flexible band having first and second ends; a curved base; a bag containing irrigating fluid, the bag located between the flexible band and the curved base; an irrigation line coupled to the bag; a pressure sensor for reading pressure in the irrigation line; a motor coupled to a shaft, the second end of the band coupled to the shaft; a spring coupled to the shaft, the spring providing a torque on the shaft; and a controller, the controller receiving an input from the irrigation pressure sensor to control the motor; wherein when the motor is actuated to turn the shaft, tension is produced in the band to change pressure in the bag. 2. The device of claim 1 wherein the motor is controlled to maintain fluid pressure in an eye during cataract surgery within a range of fluid pressures. 3. The device of claim 1 wherein the flexible band is made of a thin, non-stretching material. 4. The device of claim 1 further comprising: a clutch coupled to the motor to disengage the motor from the shaft. 5. The device of claim 1 wherein the first end of the flexible band is secured so that it is stationary relative to the curved base. 6. The device of claim 1 further comprising: a frame coupled to the curved base. 7. The device of claim 1 wherein the pressure sensor also reads pressure in the bag. 8. The device of claim 1 further comprising: a valve fluidly coupled to the irrigation line.