Feedback controlled drug delivery system

A method for sampling blood in an automated sampling system having a non-drug fluid port connected to a non-drug fluid source, a patient port adapted for providing non-drug fluid to the patient and, alternatively, drawing blood from the patient, the non-drug fluid port and the patient port being connected by a fluid pathway, a first valve operatively connected to the fluid pathway to selectively isolate the patient from the fluid pathway, a sample pathway selectively connectable to the fluid pathway via a second valve, and an analyzer connected to the sample pathway, the steps comprising:

• 1. filling the fluid pathway to the patient with non-drug fluid,
• 2. drawing the non-drug fluid away from the patient so as to draw the patient's blood into the fluid pathway;
• to a point past the sample pathway,
• 3. isolating the patient from the sample pathway by closing the first valve,
• 4. opening the second valve to permit blood to pass into the sample pathway, and
• 5. moving the blood through the sample pathway to the analyzer.

A feedback controlled drug delivery device for adjusting the quantity of a fluid delivered to a patient in response to analysis of a sample taken from the patient, comprising:

• a fluid pump receiving the fluid from a fluid source,
• a fluid line creating a fluid path between the fluid pump and the patient;
• an analyzer,
• a sample line connecting the fluid line to the analyzer, creating a sample path between the patient and the analyzer,
• a pressure means operatively associated with the analyzer for drawing the sample from the patient to the analyzer, and
• a controller communicating with the analyzer and controlling the fluid pump and the pressure means.

A feedback controlled drug delivery device for regulating the quantity of a fluid delivered to a patient by adjusting the volumetric flow from a controllable fluid source in response to analysis of a sample taken from the patient, comprising:

• a fluid tube creating a fluid path between the controllable fluid source and the patient,
• an analyzer operatively connected to a sample drawing function,
• a sample tube connecting the fluid tube to the analyzer,
• a controller communicating with the analyzer and controlling the controllable fluid source and the sample drawing function.

A feedback controlled drug delivery device, comprising:

• a controllable drug or non-drug fluid source for providing a fluid,
• an analyzer for accepting a patient sample,
• a fluid line invasively attached to a patient and connected to the controllable drug or non-drug fluid source and the analyzer,
• a controller communicating to the controllable drug or non-drug fluid source and the analyzer wherein fluid flows into the fluid line and alternately the patient sample flows out the fluid line.