Abstract: A turbulator for use in cooling computer systems is disclosed. The turbulator is disposed in a heat exchanger tube and is configured to force the fluid in a path with length more than twice the largest dimension of said heat exchanger tube. By increasing the path and thus the surface area of the heat exchanger in contact with the fluid, and by causing the fluid to swirl in the heat exchanger tube, the turbulator achieves a higher heat dissipation efficiency for the computer cooling system.

Abstract: A feedback controlled drug delivery system includes the automated sampling and analysis of a patient sample and dosing the patient based on the analysis. Automated sampling may be performed by direct analysis of the patient sample, such as for the measurement of a blood sample coagulation state or a glucose level. The drug delivery system includes a sample set that has a bidirectional patient tube that allows for delivery of the patient sample to an analyzer, and at another time, the infusion of a therapeutic drug. A controller receives a measurement from the analyzer, and based on that measurement, adjusts the delivery of the therapeutic fluid. The sample set has a quick--clear Leur fitting that allows for more effectively clearing a first fluid from a Leur fitting when starting a second fluid. The system also has a reagent cassette holder that protects, using a foam gasket, a reagent on a sample slide.