 Image Number 4 for United States Patent #6113574.
Apparatus and methods for the power and computer assisted injection of local anesthetic into a patient in a virtually pain free manner, in which anesthetic pressure is automatically monitored as an input to the computer, in which the patient is able at any time to order the automatic reduction of anesthetic pressure and in which a simple single pole switch is the only control input to the computer required of the doctor administering the injection.
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