GB1105001A - Blood treatment apparatus - Google Patents

Abstract

1,105,001. Blood oxygenator with integral heat exchanger. BENTLEY LABORATORIES. 26 May, 1966 [21 June, 1965], No. 23748/66. Heading A5R. Blood treatment apparatus comprises a casing of rigid, preferably translucent, synthetic plastics material in an upper chamber of which is an oxygenator having inlets for blood and oxygen and in a lower chamber of which is a heat exchange container having an inlet and an outlet for heating or cooling fluid. The container and the interior of the casing define between them a narrow blood flow passage in communication with the upper chamber and with a blood outlet at the bottom of the casing. The blood flow passage preferably is divided into a plurality of channels defined, for example, by grooves formed on the interior surface of the casing. As illustrated in Figure 2, a pair of mating plastics shells A and B are secured together, complementary cavities therein defining upper oxygenator chamber 10, lower heat exchange chamber 11, and central settling and debubbling chamber 12, which communicates with the oxygenator chamber by port 13 and with the heat exchange chamber by port 14, which may be formed as an elongated slot. Sealed to the front edge 18 of the casing, to close the oxygenator chamber, is the peripheral edge 21 of a plastics support plate 20 having a boss 19 on which is mounted plastics tube 22 forming a bubble chamber. The tube is surrounded by filtering material 30 having defoaming properties, for example coarse-knit mesh polypropylene impregnated with silicone anti-foaming agent. The tube is apertured at 23 to allow blood to pass to the filtering material, which is encased in a cover 31 of porous material, for example nylon fabric, secured by drawstring 32. The tube also includes a drain opening 23a and perforated baffles 28a inclined to the axis of the tube. Also mounted on the support plate are blood inlet connection 24, which may be Y-shaped and provided with sampling connection 28, and oxygen inlet connection 27 which leads to a plastics bubble tube 25 having a perforated side wall 26 and situated inside the tube forming the bubble chamber. The oxygenator chamber and debubbling chamber are in communication with a common gas discharge vent 36 by respective passages 35 and 37, which latter passage may include a plurality of connector fittings 38 to permit introduction of chemicals for treating the blood. The heat exchange container may be a cylindrical can 40 sealed at 42 into an opening in the wall of the casing and formed with a beaded rim which interlocks with ridge 41 provided inside the casing. Fluid, for example temperaturecontrolled water, enters the can by inlet 52 and leaves by tube 51 and outlet 50. Blood, which collects in sump passage 44 after passing through annular channels defined by grooves formed on the interior surface of the casing, leaves via outlet connection 55 which may be Y-shaped and provided with a thermometer or thermocouple tube 56. In' use, the casing preferably is supported from hanger holes 16 with the back edge 17 vertical, the level of blood preferably not falling below line 61.