SU397208A1 - DEVICE FOR MEASURING BLOOD LEVEL IN OXYGENATOR - Google Patents

Description

one

The invention relates to medical technology, and specifically to devices for measuring blood levels in an oxygenator.

Similar devices are known that contain corus, a glowing lamp and a photodiode mounted on a transparent, biologically inert blood-to-blood tube connected to an oxygenator but not told to the blood vessels.

However, the use of these devices does not exclude the possibility of a gas embolus. In addition, they do not desaturate the continuous receipt of information about blood level and high measurement accuracy.

In order to eliminate these drawbacks, the proposed device is equipped with two photocells located one above the other and above the photodiode, and the transparent tube is filled with a biologically inert liquid, for example, with colored olive oil.

FIG. 1 shows the proposed device, a general view; in fig. 2 is a section along A-A in FIG. one; in fig. 3 is a section along BB in FIG. one; in fig. 4 shows a section along the line Bb of FIG. 2

The device comprises a housing /, an upper 2 .11 lower 3 cover, a screw 4 and a guide 5 for setting the zero position of the device relative to the level of blood poured into the oxygenator, a bracket 6 for attaching the device to the oxygenator, photo cells 7, 8 and photodiode 9 placed in a presser the cover 10, the lamp 10, the guides 12 and 13, having 1, do not coincide with the windows 14 and 15 for passing through the light stream, and the windows 16 and 17 for visually monitoring the level of blood.

Transparent tubes 18 and 19, filled with a biologically inert fluid, are installed in guides 12 and 13, and are filled with tinted Provencal ma-scrapping. The tubes 18 and 19 are interconnected by a distributor 20 in the manner of communicating vessels. The distributor 20 through the tube 21. Connected with the oxygenator.

Photovoltaic cells 7 and 8 convert light energy that changes in conjunction with a change in the level of biologically inert fluid.

(and therefore the blood level in the oxygenator), into the electrical one. The window 14 is divided by a jumper 22, which also serves as the zero reference line for the levels of blood filled into the oxygenator.

The device works as follows.

Before filling the oxygenator with blood, tube 21 is clamped by a clamp, and tubes 18 and 19 are filled biologically inertly with liquid, and the electronic circuit is turned on.

Then the oxygenator is filled with blood and the tube 21 is released. The biologically inert liquid in tubes 18 and 19 occupies a certain level. If it turns out to be above or below jumper 22, then by turning screw 4 clockwise for length against it, the device is set so that the level of the liquid in tube 18 coincides with jumper 22. This will correspond to the zero shown (or the volume of blood in the system ). If the blood level in the oxygenator decreases, the biologically inert column will also drop in tube 18, causing the photocell illumination to increase, and an arrow on the scale of the electrical device connected to photo cells 7 and 8 will show a decrease in the volume of blood in the system. If the blood level drops to the minimum (critical), then the photodiode 9, not covered by a column of liquid in the tube 18,

1POD by the effect of the luminous flux of the dasT command to shut off the arterial pump.

Subject invention

A device for measuring the blood level in the oxygenator, comprising a housing, an incandescent lamp, and a photodiode mounted on a transparent one connected to the oxygenator

The principle of the communicating vessels of the tube, characterized in that, in order to reduce the risk of a gas embolism, to continuously obtain information about the level of blood and to improve the accuracy of the measurement, it is equipped

two photocells located one above the other and above the photodiode, and a transparent tube filled with a biologically inert liquid, such as tinted olive oil.

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