Abstract: Apparatuses and methods for measuring total blood volume with ultrasound are disclosed. In one embodiment, a system for monitoring a blood volume of a patient includes an ultrasound transmitter configured for emitting an ultrasound toward a target blood vessel of the patient; and an ultrasound receiver configured for receiving the ultrasound reflected from the target blood vessel of the patient. The system also includes, a controller configured for: determining an expanded state of the blood vessel based on the ultrasound reflected from the target blood vessel; determining a collapsed stated of the blood vessel based on the ultrasound reflected from the target blood vessel; and determining the blood volume of the patient based on the ratio of the collapsed stated and the expanded stated of the blood vessel.

Abstract: A thermally representative phantom mammalian manikin assembly is provided. The assembly can include a cover portion representative of mammalian tissue partially enclosing a thermal cavity having a thermally representative material therein. The cover portion can have an opening with a cap extending across the opening and configured to further enclose the thermal cavity. The cap can have an aperture extending therethrough to receive a device extending through the aperture and into the thermally representative material within the thermal cavity. The device can be a thermocouple configured to measure a temperature of the thermally representative material. In assemblies representing mammalian limbs, the assembly can further include a second thermal cavity representing an additional portion of the limb, e.g., thermally representative upper and lower leg cavities.

Abstract: Feedback-controlled pressure monitoring system for limb-stabilizing medical pressure splints are described herein. In one embodiment, a limb-stabilizing system, includes: a pressure splint; a pressure sensor operatively coupled with the pressure splint; a controller configured to receive a first signal from the pressure sensor and to send a second signal to a pump; and the pump operatively coupled to the pressure splint. The pump is configured to adjust a pressure of air inside the pressure splint based on the second signal received from the controller.

Abstract: A cooling tourniquet system (100) includes a cooling component (110) with a tourniquet (112) at a proximal end and a control component (130). The cooling component includes a cooling pad (120) configured to be wrapped about an extremity, and a cover (111) that wraps around the cooling pad. An inner surface of the cooling pad includes one or more sensors for detecting the temperature of the extremity. The tourniquet is configured to be applied to the extremity to stop blood flow distally from the tourniquet. The control component receives temperature data from the sensors, and controls the cooling pad based on the received data rapidly cooling the extremity at depth, without causing frostbite tissue damage. In one embodiment the control component circulates a chilled fluid with a time-varying temperature profile through passages in the cooling pad. In an embodiment the cover includes an air bladder that holds the cooling pad in contact against the extremity.