The Osborn - Bramson - Gerbode Rotating Disc Oxygenator has been designed and de- veloped by the San Francisco Institute of Medi- cal Sciences (located at San Francisco Stanford Hospital1 and is now the only type used for per- fusions by the Card&Vascular unit of the In- stitute. It has also been adopted by a number of cardiac surgeons in the United States and foreign countries.

At this printing (5-1-60). it has been used at San Francisco Hospital for 103 open-heart operations, with perfusions lasting up to three and one-half hours. With the useof this oxygen- ator, there has been almost no port-operative fever and no ill effects traceable to the heart- lung machine following any of these operations.

Model 1235

SPECIAL FEATURES 1. At the maximum recommended speed of rotation I1 20 RPM1 and perfusion rate (4% liters per minute) the Osborn- Bromron-Gerbode Oxygenator doer not produce foam, nor does it require the use of anti-foam compounds (now generally considered traumatic). 2. The ratio of oxygenating surface to priming volume is almost doubled when compared with best previous practice. 3. The Osborn-Bramson-Gerbode Oxygenator embodies heat transfer characteristics which, without additional blood contact surfaces or priming volume, allows perfusions to be combined with rapid cooling and m-warming of the circulating blood. 4. Cleaning techniques have been developed which greatly reduce the cleaning man-hours per perfusion. (The cleaning process is per- formed on the shaft-disc assembly (II a unit, without disassembling, by successive immersions in processing and rinsing tanks.)

A detailed description of the oxygenator, its design, performance, clinical use, cleaning and maintenance, will be found in the April 1960 issue of the Journal for Thomcic and Cardio-Vascular Surgery.

1341 SEVENTH STREET, BERKELEY 10, CALIFORNIA

Side View of Oxygenator

SPECIFICATIONS

1. Main cylinder and discs ore mode of stainless steel. 2. The end covers ore mode of transparent K&F plastic, reinforced with aluminum (the aluminum does not come into contact with the blood). 3. The blood inlets and outlets ore vertical, below the discs. 4. The blood outlet is provided with an anti-vortex baffle. 5. A jacket is provided for hot and cold water circulation to provide temperature control. 6. A two-stage rubber belt speed reducing drive with motor attached to the unit is provided so that the oxygenator can be freely suspended and continuously weighed for accurate volume control. A tachometer generotor is similar- ly mounted for shaft speed measurement. 7. Electric light bulbs ore mounted inside end covers to facilitate observation of blood levels. 8. A clip is provided at the output end of the oxygenator for a photo cell level sensing device if desired. 9. A separate cabinet housing the power supply for the motor and lamps is provided. guilt into this cabinet is an ad- justoble power transformer to regulate the speed of the motor driving the shaft. The cabinet also incorporates on its front panel a meter to indicate the speed of the shaft by measuring the voltage output of the tachometer gen- emtor.

The oxygenator may be set upon a table with one end, on which the motor and tachometer generator ore mounted, raised slightly higher to provide for proper flow of blood through the unit. As an alternate, the oxygenator may be suspended from Iwo beams on which ore mounted strain gouges. The output of the strain gauges is fed into on electronic instrument controlling the position of a motor-driven adjustable power transformer which in turn controls the speed of the motor of the blood pump to automaticolly regulate the blood flow so that constant blood volume is maintained in the oxygenator. This equipment is avail- able at extm charge.

Shaft and Disc Assembly with carrying case