Abstract: The device to monitor distance between people measures a pre-defined distance between a first person and other persons, and alerts the user when the pre-defined distance has been breached or violated for more than a pre-determined time. Intended to protect a first human from the deleterious effects of radiation (nuclear) associated with a second human, but useful in other circumstances, the device is designed to detect the presence of a first person within a protective radius of one to two meters of a second person by pairing the combination of one heat sensor with one distance sensor. In the event the first person is within that radius for the predetermined time, the device will alert the user of that circumstance. Alert feedback mechanisms can include an acoustic audible signal, a visible signal, a vibratory signal, or phone notification.

Abstract: A fluid volumetric flow sensor has relaxed dimensional tolerances when compared to prior art devices of the type in which a swirl, imparted to the fluid by channels in a housing, causes a rotor to spin. The rate at which the rotor spins may be measured by allowing the rotor lobes to interrupt an optical beam generated by a clip-on opto-electric module. The swirl-inducing channels that cause rotor motion lead from an inlet chamber into a small volute chamber that is upstream of and separate from the rotor chamber. Fluid impinging on a thrust reverser at the downstream end of the rotor chamber provides a fluid support so that the rotor is entirely supported by flowing fluid at normal flow rates. The thrust reverser may be a bluff body formed on a tension shaft that is attached to and extends downstream from a wall of the volute chamber through an axial lumen in the rotor body.

Abstract: A removable U.V. light array assembly for use in a photoactivatable agent, patient treatment system wherein photoactivatable agents, in contact with patient blood cells, are irradiated extracorporeally and then returned to the patient.

Abstract: The invention is concerned with a hemodialysis technique employing a dialyzer having a blood flow compartment separated from a dialysate flow compartment by a semi-permeable membrane. According to the invention, this technique is improved by providing for the osmolarity of the dialysate to be increased as a function of time during at least a portion of the total treatment time, whereby dialysis disequilibrium syndrome problems can be alleviated.

Abstract: There is provided an inexpensive disposable temperature monitoring probe for use in a patient treatment system wherein photoactivatable agents, in contact with patient cells, are irradiated extracorporeally to photoactivate said agents and then returned to the patient.

Abstract: In a system for altering cells such as by irradiating said cells when in contact with a photoactivatable reagent useful for the extracorporeal treatment of a patient's blood, a three phase method for performing the operations in a safe and efficacious manner.

Abstract: A mechanism for aurally instructing a patient whose circulatory system is coupled to an infusion or exchanging machine and which includes a comparing means for discriminating between various malfunctions of the machine and reporting serially those of higher priority, with the objective of instituting a corrective feedback through specific directions to operator.