We refer to this as the ‘Volkswagen’ pump — thousands have been used successfully for self administration studies. The standard speed of the PHM-100 is 3.33 RPM but other motors are available and can be changed by the user. The PHM-100 pump is activated by a MED-PC® 28V output and turned on as long as the output is on. Thus the time on determines the dose. A safety stop switch disconnects power from the motor when the end of the syringe has been reached.
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