The Urine Transport System consists of an implanted catheter, urine collector, actuator assembly, and transport subsystem. Urine is collected, measured, and transferred downstream at hourly intervals to the Urine Analyzer located in the adapter section of the Biosatellite.

Catheter: The silastic urine catheter is implanted in the monkey bladder, exteriorized through the perineum, and mated to the urine transport system at the side of the couch. The catheter is designed to remain in place for thirty days.

Collector: The urine collector is essentially a container with a flexible diaphragm and a net capacity of 100 ml. The collector passively receives the urine produced by the animal. Once an hour, the collector is emptied by a peristaltic pump into the actuator assembly. The pump is started by an automatic signal.

Actuator Assembly: The actuator assembly delivers 10 ml volumes of urine downline to the Urine Analyzer with piston action, as long as urine is received from the peristaltic pump. If the final filling of the actuator is less than 10 ml, that urine remains in the actuator until the next hour pumping sequence is started. Spacecraft telemetry reports the number of hourly 10 ml "dumps" of the actuator to provide a measure of urine excretion rate. Each dump cycle is indicated by a corresponding telemetric voltage increase of 0.3 ± 0.075 V. Sixteen dumps increase the voltage in even increments from 0 to 4.5 V, after which the voltage recycles to zero. For any given hour there is an uncertainty of ± 10 ml; however, in any summation of consecutive hour values, the uncertainty always remains 10 ml for the the total summated period.

Transport Subsystem: The urine transport subsystem is constructed of nonpathogenic tubing totaling 4.8 m in length, a pressure-operated emergency valve and bag in case of downline block- age, a filter screen with capacity for the entire flight, the peristaltic pump, a solenoid valve, a series of quick disconnects between the capsule and adapter, and an evacuated titanium storage tank. A separate, smaller urine tank, light in weight and strong enough for evacuation, stores urine until it is analyzed by the Urine Analyzer. Tubing internal diameter ranges from 2.3 mm to 6.4 mm, and the dead space volume between the monkey and the analyzer is 105 ml.

Dimensions: Unknown

Weight: Unknown

Power: None

Collector Volume: 100 cc

Actuator Volume: 10 cc

Actuator Accuracy: ± 10 ml

Urine excretion rate, telemetered during the flight.

Urine Transfer/Measurement Unit: To supply sterile simulated urine to the transport and measurement assembly, and collect the effluent to determine functional integrity of the system.

•Pace, N., et al.: Biosatellite III Urine Analysis System Characteristics. Urine Excretion Rates of Calcium, Creatine, and Creatinine in the Test Monkeys and Flight Monkeys Used for NASA Biosatellite III. NASA CR-114425, 1971, pp. 9Ð15. (Limited to U.S. government employees and contractors.)

•Mains, R.C.: Report on Primate Restraint and Acceleration Protection System, Reentry Acceleration Data, and Flight Diet Composition for U.S. Biosatellite III Project. NASA Ames Research Center, February 1980.

•Biosatellite Project Historical Summary Report. J.W. Dyer, ed., NASA TM-X-72394, December 1969.

Biosatellite III