SU921571A1 - Diphragnatic oxygenerator - Google Patents

Description

(5) MEMBRANE OXYGENATOR

I

The invention relates to a medical technique, namely to blood oxygenators, and can be used for the purpose of oxygenation of human and animal blood, in particular, in cardiac surgery.

A membrane oxygenator is known, containing supporting plates with recesses and gas-permeable membranes located between the plates {11,

However, the presence in the known device of the blood distribution grid results in the need to increase the initial filling volume of the oxygenator.

The purpose of the invention is to reduce the blood volume of the initial filling of the oxygenator,.

The goal is achieved by the fact that in the membrane oxygenator containing support plates with recesses and gas-permeable membranes located between the plates, the recesses are located on the plane

Each support plate is uniform, in the central part of each recess there is a protrusion, the height of which is 0.6-0.8 of the depth of the recess, and the recesses on one side of the support plate correspond to flat parts on the other.

FIG. 1 shows a membrane oxygen generator, top view; in fig. 2 the same, side view; in fig. 3 support plate, top view; in fig. the same, side view; in fig. 5 shows the node I in FIG. A, on an enlarged scale; in fig. 6 — fragment of the support plate with recesses, on an enlarged scale; in fig. 7 is a section A-A in FIG. 6,

A membrane-type oxygenator is a set of diffusion elements 1 sandwiched between two ending plates 2 and 3i, with one of the ending plates 2 having fittings for input and output of blood and oxygen. Each

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The diffusion element consists of two support plates 5 and an envelope-chamber of gas-permeable membranes 6. On the working planes of the support plate, a series of recesses 7 and 8, for example cylindrical, with protrusions 9 and 10 on their bottom in the center, 0 , 6-0.8 are the depths of the recesses, with the centers of the recesses 7 on the upper side of the support plate shifted relative to the centers of the recesses 8 on the lower side of the support plate by an amount (da).

When assembling the oxygenator, the support plates are installed in such a way that in each diffusion element a flat part on the other corresponds to a recess on one plate. The distance between the centers in row B is 2 (da), the distance between the axes on which are located, the centers of adjacent recesses a is (da), and the diameter of recesses d is chosen so that each recess overlaps 7 one plate of segments 11 wide and depressions 8 of another plate. In addition to the recesses, continuous channels 12 for the passage of gas are applied to the working surfaces of the support plates, and the depth of the channels exceeds the depth of the recesses.

The oxygenator works as follows.

When blood enters the diffusion elements under the action of blood pressure, the diffusion membranes bend into the depressions of the supporting plates, the upper membrane (upper and lower sides being conventionally accepted) deflecting into depressions 8 with projections 10 on the lower side of the supporting plate, and the lower into depressions 7 on the upper side of the support plate 5, formed due to the fact that the centers of the recesses on the upper and lower sides of the support plates are offset relative to each other. The segments 11, formed by the mating depressions of the two support plates of the diffusion element, are blood collectors through which all the depressions communicate with each other. When blood moves through the diffusion element, its mixing occurs. Mixing occurs due to repeated transition of blood through segment 11 from one cavity to another. The effect of blood mixing is further enhanced by the presence in the recesses of the projections separating the blood flow in each recess. Since the height of the protrusions is 0.6-0.8 of the depth of the recess, there is no loss of the working area of the diffusion membrane.

The presence in the blood chamber of a diffusion element of multiple transitions for blood flow creates conditions for good mixing of blood without the use of a distribution grid.

The design of the proposed oxygenator provides a minimum filling volume with sufficient removal of oxygen and elimination of CO from the blood. Compared to the known oxygenator, the working pressure was reduced from 200 to 50 mmHg, the initial filling volume was reduced from AOO to 150 ml, the degree of hemolysis was reduced from 27 to 15 mg% for 2A hours of operation.

Claims (1)

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