SU29225A1 - Blood clotting device - Google Patents

Description

To correctly determine the rate of blood coagulation, it is necessary to create conditions that allow it to be determined at a constant temperature and under strictly defined conditions of contact between the blood sample under investigation and the surface of the vessel, tube, etc., in which it was determined. Existing instruments for this purpose, consisting of a double-walled vessel equipped with a thermometer and a capillary tube for blood, and methods for determining the rate of blood coagulation are deficient in either the first or the second relation.

The proposed device aims to create the possibility of extracting a portion (columns) of blood that are in the sequential stages of convolution, provided that each column of blood passes — from the moment of capillary ingestion to the moment of determining the degree of its coagulation — the same way; and ensure that the temperature of the capillary is constant both during the course of the determination and directly in the blood collection.

In FIG. 1 shows a vertical section of the device; FIG. 2 is another form of implementation.

The device consists of a thin-walled glass capillary / immersed in a glass cylindrical vessel 2, which is connected to tube 4, by which one way or another (sucking mouth through a rubber tube with a mouthpiece, syringe, lifting the tube previously immersed in a vessel of water etc.) a negative pressure is created in the vessel 2, equalizing when air enters through the capillary p /. The test blood is drawn into the capillary / in the indicated manner (by suction through tube 4) in several portions (columns) separated by columns of air. At certain intervals, the individual columns of blood are expelled (using the same suction manipulations) into a liquid previously poured into vessel 2. If a portion of blood enters this liquid in which the coagulation process has not reached any appreciable degree, then blood evenly distributed

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in liquid; the beginning of a noticeable coagulation corresponds to the discharge of blood from the capillary by small flakes; the end of coagulation is determined by the moment the whole blood coagulates.

To maintain a constant temperature indicated by the thermometer b, vessel 2 is made with double walls or placed in a vessel with water 5, the temperature of which is set at a certain height before the start of the experiment and kept at the same level until the end of it.

Thus, the capillary p / brought to a certain level of temperature before the start of the experiment is no longer removed from vessel 2 to the end of the experiment and does not undergo any significant temperature fluctuations either at the time of its filling with blood or during the subsequent production of the experiment. Each portion of blood entering fluid 5 makes a path of equal length equal to the length of the entire capillary.

In the vessel 2 it is possible to introduce two or more capillaries, in order to stop the access of air through non-operating

The capillaries can be a piece of wax, a sealing top opening of the capillary, an elastic plug 7, or a pad on the spring 8, pressed against it (Fig. 2).

The subject matter of the invention.

Claims (2)

1. An instrument for determining the coagulation of the blood consisting of a cylindrical glass vessel with double walls and a stopper through which a thermal system and capillaries are placed inside the vessel. blood, characterized by the use of a tube through tube inside the vessel 2-3 tube 4, which serves to dilute the air in the vessel in order to suck blood into the capillary tube and to suck out of the last individual portions of blood into the fluid 5 poured into the bottom of the vessel (Fig. 1). 2. The form of the device according to claim 1, characterized by using two or more capillaries for blood supplied, for the implementation of the possibility of using each of them separately, at the upper ends of elastic plugs 7 held by flat springs 8 (Fig. 2). V.