A three-function electric ICU bed typically offers adjustments for backrest elevation, leg elevation, and overall bed height, allowing for patient positioning and comfort. These functions are usually controlled by an electric motor, often with a remote control for ease of use. 

1. Backrest Elevation:

Allows for raising and lowering the head and upper body of the patient, which can be helpful for various activities like eating, reading, or breathing difficulties.

Can be adjusted to an angle of up to 85 degrees, providing comfortable positioning for the patient.

2. Leg Elevation:

Enables raising and lowering the patient's legs, which can be beneficial for improving circulation and reducing swelling.

Can be adjusted to an angle of up to 45 degrees, offering customized support.

3. Overall Bed Height Adjustment:

Allows the entire bed to be raised or lowered, making it easier for caregivers to attend to the patient and for the patient to transfer in and out of bed.

Provides a height range, typically from 0 to 260mm, to accommodate different patient needs and caregiver preferences.