A publicist for Randy Travis told TMZ that he has now been fitted with the "world's smallest heart pump," and has not had heart surgery.
The device is often inserted through a "standard catheterization procedure," where the doctor inserts the device into an artery in the arm, groin or neck and sends it to the heart.
The device is the same size as a coffee stirrer and is smaller than a pencil in diameter.
A ventricular assist device, according to the Mayo Clinic, is "an implantable mechanical pump that helps pump blood from the lower chambers of your heart (the ventricles) to the rest of your body."
A rep for Travis said the procedure is minimally invasive.
The country singer is still in critical condition.