Adjustable-size backboard for a mechanical cpr device

A mechanical cardio-pulmonary resuscitation (CPR) device, comprising:

• a compression mechanism configured to perform successive CPR compressions to a chest of a patient, the compression mechanism comprising a piston, and a driver coupled to the piston and configured to extend the piston toward the chest of the patient and to retract the piston away from the chest of the patient;
• support legs configured to support the chest compression mechanism at a distance from the chest of the patient;
• and
• an adjustable-size backboard configured to be placed underneath the patient,, the adjustable-size backboard comprising:
• a first connector structured to attach the adjustable-size backboard to a first leg of the support legs,
• a second connector structured to attach the adjustable-size backboard to a second leg of the support legs, and
• an adjustable elongated portion extending between the first connector and the second connector, the adjustable elongated portion including a first portion extending from the first connector and a second portion between the first connector and the second connector and structured to slide relative to the first portion.