RU163805U1 - MICRO-TEST FOR THE TAKE-UP OF CAPILLARY BLOOD - Google Patents

Abstract

1. A microtube for taking capillary blood, containing a cylindrical body, on the lower end of which is mounted a removable locking cap with a closed upper end surface, and on the upper open end is a removable capillary installed in the hole of a removable locking cap, for fixing on the open end of the closure covers on the outer surface of the open end of the housing at a distance of the height of the locking cover is made an annular supporting flange, and in the upper end part of the locking covers an annular groove is made, interactions a blade is used to take capillary blood by gravity on the open end end of the microtube body; a blade is made to unlock and remove the closure covers on the outer surface of the upper open part of the body around the circle, convex teeth in the form of triangles interacting when unlocking the locking caps with the corresponding convex teeth of the locking caps, made around the circumference on their inner surface, and for fixing and on the open end of the closure cap body with the upper end surface closed on the convex teeth of the upper part of the microtube body and on the convex teeth of this closure cap, protrusions are made that interact when fixing the closure cap, characterized in that the bottom of the microtube is made at a height equal to the height of the closure cap + 0.5-1 mm, the edge thickness of the scapula for taking capillary blood by gravity is 0.3 mm, and the removable capillary is made with an outer diameter of 2.9 mm, the opening of the removable capillary is made with a diameter of 1.9 mm, while the peaks

Description

The patented utility model relates to laboratory glassware, in particular, to microtubes for collecting, analyzing and storing capillary blood for various volumes, with finely dispersed deposition of anticoagulant for biochemical, immunological and serological tests.

Microtubes for capillary blood sampling are widely used in modern clinical diagnostic laboratories, due to ease of use and cost-effectiveness. When filling a microtube with blood up to the mark, the anticoagulant sprayed onto the walls or the liquid solution is evenly mixed with the blood, providing a standard and constant ratio of blood and anticoagulant.

A known microtube for the placement of fluid samples (international application WO 2007/015160, B01L 3/14), comprising a housing having a wall forming a vessel, and a mounting rim made at least on part of the upper edge of the wall and having a contact surface, a cover, from one surface of which passes the mounting hook, and a loop connecting the cover to the body.

The fixing hook is adapted to interact with the contact surface of the fixing rim, and the wall of the housing is made of material that can be deformed by the pressure exerted by the user, thereby making it possible for the fixing hook to come out of interaction with the fixing rim when the lid is in the closed position, closing the vessel, and then ensuring that the lid is opened by means of a hinge.

The microtube further comprises a sealing skirt attached to the inside of the cap

The disadvantage of this microtube is the operational inconvenience of sampling, for example, capillary blood, since there is no capillary in the design of the microtube, and a profiled blade for gravity collection is not provided at the open end of the microtube body.

Among the disadvantages of the known microtubes should be attributed to low operational safety for medical personnel due to the unreliable sealing mechanism of the sample taken.

The sealing mechanism of the sample taken in the microtube body is implemented as a fastening hook that interacts with the fastening rim when the lid is in the closed position, closing the vessel, and then ensuring that the lid is opened by means of a loop. Such a design makes it possible to leak part of the sample taken, for example, capillary blood.

A known tube for collecting and storing a sample having a cylindrical body and a lid pivotally connected to the body by means of a jumper representing a single structure made of thin-walled transparent polymer material (RF patent No. 101381 for utility model, B01L 3/14).

The tube body on the open side is made with a shoulder for fixing the lid in the closed position, and on the other hand, is stepped, forming a step of a smaller diameter with respect to the cylindrical part of the body, visually separating the boundary of the required volume sufficient to accommodate the minimum amount of substance required for samples.

The cap of the tube is made with a locking tab for interaction with the bead of the housing and fixing the cap.

The disadvantage of the test tube according to the patent of the Russian Federation No. 101381 for the utility model is the large overall dimensions of the case and the operational inconvenience of sampling, for example, capillary blood, since the design of the test tube does not include a capillary or a spatula for taking blood by gravity.

It should be noted the lack of reliability of the mechanism for fixing the cap of the tube body in the closed position, which is implemented as a single collar. Such a design does not exclude the possibility of leakage of part of the sample, for example, capillary blood. The low reliability of the mechanism for fixing the lid of the microtube case leads, respectively, to the low operational safety of such a tube for medical personnel.

A microtube for capturing capillary blood is known from the prior art (Microvette® Capillary Blood Capturing Systems (Sarstedt, Germany), (found on the Internet: http://vyww.medinst.ru/SarstedtMicrovette.htm; http: //www.rts-engineering .ru / Med / Sarstedt / imgSarstedt / Ins20_1288.jpg).

The microtube for taking capillary blood (Microvette® (Sarstedt, Germany) contains a cylindrical body made in the form of two coaxially located structural elements. The outer case element is made in the form of a cylinder with open ends, and the inner case element is in the form of a cone-shaped sleeve with the applied a removable locking cap is mounted on the lower end of the outer cylinder, and a removable capillary with a locking cap is mounted on the upper open end of the inner cone-shaped sleeve. support lugs on the open end of the housing on its outer surface is made of an annular supporting flange, and in the upper closed end part of the closure covers there is a reciprocal annular groove interacting when fixing the closure covers with the walls of the open end part of the microtube body.

To unlock and remove the locking caps on the outer surface of the upper open part of the conical sleeve of the housing and on the inner surface of the locking caps are made convex teeth located around the circumference.

A design flaw in a micro-tube for taking capillary blood (Microvette® (Sarstedt, Germany) is:

- the structural complexity of the microtube body, made in the form of two coaxially arranged parts - a cylinder and a cone-shaped sleeve sealed at the bottom. This leads to the need to prepare 2 expensive molds for casting parts of the microtube body, and also complicates the operation of assembling the body in the production process, which ultimately leads to a higher cost of microtube production.

- the implementation of the housing of the microtube in the form of two coaxially arranged parts - the cylinder and the cone-shaped sleeve sealed at the bottom causes an increased consumption of polymer material, which leads to an increase in the cost of the microtube, and given the large volumes of microtube production, it causes large financial and economic losses for the manufacturer;

- insufficient visibility of the level of capillary blood in the microtube due to the presence of two additional interfaces for the optical beam between two coaxially located parts of the microtube body leads to errors in determining the volume of capillary blood in the cavity of the body and to errors in the analysis of the taken blood;

- operational inconvenience of taking capillary blood by gravity.

Any part of the open end end of the tube body (cone-shaped sleeve of the case) is used for gravity collection of blood, which does not have a profiled section in the form of a scapula that is convenient for taking capillary blood, which allows for quick and convenient for medical personnel directed flow of capillary blood into the cavity of the microtube body. In addition, the absence of a profiled section in the form of a scapula leads to the loss of versatility of a microtube, since it becomes impossible to use it without a capillary.

The disadvantages of the known microtubes include the implementation of the mechanism for unlocking and removing the locking caps in the form of triangular teeth. With this design, the unlocking and removal of the locking caps is carried out by moving one of the teeth (for example, the teeth of the locking cap) on the inclined surface of the opposed teeth of the conical sleeve of the microtube body. Thus, the contact friction of the teeth occurs along the entire inclined surface of the teeth, which requires significant effort to remove the locking cover, i.e. the operation of removing the locking cap is not always convenient and comfortable for medical personnel.

Known microtube for taking capillary blood (RF patent No. 114277 for utility model; B01L 3/00), the closest in its technical essence and adopted as a prototype of the patented utility model.

The microtube for taking capillary blood (patent of the Russian Federation No. 114277 for a utility model) contains a cylindrical body, on the lower end of which a removable closure cap with a closed upper end surface is mounted, and a removable capillary installed in the hole of a removable closure cap is mounted on its upper open end.

To fix the locking caps on the open end of the housing, an annular supporting flange is made on the outer surface of the open end of the housing, and an annular groove is made in the upper end part of the locking caps, which interacts when fixing the locking caps with the walls of the open end part of the microtube body.

To unlock and remove the locking caps on the inner surface of the locking caps around the circumference are convex teeth.

To take capillary blood by gravity, a scapula is made at the open end end of the microtube body, and a supporting shoulder is made on the outer surface of the open end of the body at a distance of the height of the closure cap.

To unlock and remove the locking caps on the outer surface of the upper open part of the housing, convex teeth are made interacting when the locking covers are unlocked with the corresponding teeth of the locking caps, and for fixing the locking cover on the open end of the housing with the upper end surface closed on the convex teeth of the upper housing microtubes and protrusions are made on the convex teeth of this closure lid, which interact when fixing the closure lid.

Convex teeth for unlocking and removing the locking covers are made on the outer surface of the housing in the form of triangles, and on removable locking covers in the form of smooth curved teeth.

The microtube is made of polypropylene. The lower closed part of the microtube body is in the form of a cylinder or a rounded shape.

Graduation was performed on the microtube body, indicating the volume of capillary blood in it.

The use of the microtube according to the patent of the Russian Federation No. 114277 in medical practice has revealed certain design and operational disadvantages of this microtube. So particular:

- it was found that when capillary blood is taken in volumes of 100-200 ml, it is visually difficult for medical personnel to control the volume of blood already taken, since the bottom of the microtube is made at an insufficient height and is closed by a removable locking cap. It should be noted that blood sampling in volumes of 100-200 ml is carried out most often in medical institutions. Quantitatively, this amounts to tens of thousands of procedures;

- when taking capillary blood by gravity using a scapula, there is a difficulty in entering capillary blood into the cavity of the microtube body, which is due to the not optimal thickness of the edge of the scapula, which “slows down” the movement of a blood drop to a certain extent;

- medical personnel also identified certain difficulties in blood collection using a capillary. The capillary dimensions used in practice do not ensure its high capillary properties, do not contribute to the rapid flow of blood into the cavity of the capillary, which accordingly lengthens the blood sampling procedure;

- it should be noted that the difficulties encountered in the blood sampling procedure using a scapula or capillary negatively affect the safety of using this microtube;

- in the process of automatic assembly of this microtube, it was found that the execution of convex teeth of curved shape and without chamfers on the locking caps (to unlock and remove) often leads to rejection of products due to “jamming” and deformation of the edges of the locking caps.

Patented utility model is aimed at solving the following technical problem:

- improvements in the design of microtubes;

- improving the operational convenience and safety of the capillary blood sampling procedure;

- increase the safety of its operation by medical personnel.

The solution of the technical problem is achieved by the implementation of microtubes in two design options as follows.

A microtube for taking capillary blood, similar to a microtube (RF patent No. 114277 for utility model), containing:

- a cylindrical body, on the lower end of which is mounted a removable locking cover with a closed upper end surface, and on the upper open end is a removable capillary installed in the hole of a removable locking cover,

- for fixing on the open end of the housing of the closure caps on the outer surface of the open end of the housing at a distance of the height of the closure cap, an annular support flange is made, and an annular groove is made in the upper end part of the closure covers interacting when fixing the closure covers with the walls of the open end part of the microtube enclosure,

- for taking capillary blood by gravity at the open end end of the microtube body, a scapula is made,

- to unlock and remove the locking caps on the outer surface of the upper open part of the housing circumferentially made convex teeth in the form of triangles interacting when unlocking the locking caps with the corresponding convex teeth of the locking caps made in a circle on their inner surface,

- and for fixing on the open end of the housing of the closure cap with a closed upper end surface on the convex teeth of the upper part of the microtube body and on the convex teeth of this closure cap, protrusions are made that interact when fixing the closure cap, according to the patented utility model:

- the bottom of the microtube is made at a height equal to the height of the closure cap + 0.5-1 mm, and the thickness of the edge of the scapula for taking capillary blood by gravity is 0.3 mm.

It is envisaged that the removable capillary is made with an outer diameter of 2.9 mm, the opening of the removable capillary is made with a diameter of 1.9 mm.

According to a utility model, for unlocking and removing the locking caps, the convex teeth of the locking caps are made in the form of triangular protrusions, the tops of which are chamfered at an angle of 45 °.

The microtube is made of polypropylene. the lower closed part of the microtube body is made in the form of a cylinder or a rounded shape, an anticoagulant is applied to the inner walls of the microtube body and in the capillary cavity, the capillary is sterile, a graduation is performed on the microtube body, indicating the volume of capillary blood in it.

The technical result of the developed microtube is that the patented utility model allows:

- significantly improve the design of the microtube, in particular, the casing in its bottom, a blade for blood sampling by gravity. To ensure the optimal rate of blood flow into the body cavity, the blade edge thickness is 0.3 mm;

- determine and implement the optimal capillary dimensions in the design. To increase the speed and reduce blood sampling time, the removable capillary is made with an outer diameter of 2.9 mm, and the opening of the removable capillary is made with a diameter of 1.9 mm;

- significantly increase the operational convenience and safety of the capillary blood sampling procedure; increase the safety of medical personnel;

- improve the accuracy of the results of the analysis of capillary blood during blood sampling with a volume of 100-200 ml due to a clear visual control of the blood level in the microtube, to ensure reliable results of the analysis of capillary blood;

- significantly reduce the percentage of defects in the automatic assembly of microtubes. The presence of chamfers at an angle of 45 ° on the tops of the triangular protrusions of the locking caps allows for the automatic assembly of microtubes to significantly reduce the rejection of products and to almost completely eliminate defects in the form of “jamming” and deformation of the edges of the locking caps.

It should be further noted that the patented utility model can significantly increase the operational usability of the patented microtube by medical personnel, because:

- the universality of the use of microtubes is ensured (with a capillary and using a profiled blade at the open end of the microtube body),

- maximum safety is ensured for both the patient and the medical staff working with blood from infection with dangerous infectious diseases such as AIDS, hepatitis, etc .;

- it is possible to produce capillaries in two implementations: non-sterile and sterilized, which allows to increase the degree of protection of the patient and medical personnel when taking capillary blood;

- achieved easier removal of the locking caps from the microtube, which reduces the aerosol effect to a minimum.

The essence of the utility model is illustrated by the description of a patented microtube for taking capillary blood and graphic materials on which are presented:

FIG. 1 (a, b, c) - a microtube with a capillary and two locking caps;

FIG. 2 (a, b) - microtube without capillary;

FIG. 3 (a, b, c) - locking cap 4, in which the capillary is installed;

FIG. 4 (a, b, c, d) - a microtube and elements of its body;

FIG. 5 (a, b, c) - locking cap 2 for closing a microtube with blood.

A patented microtube for taking capillary blood is made of polypropylene and contains (Fig. 1a, b, c) a cylindrical body 1. The cylindrical shape of the microtube body is optimal for applying risks (graduations) indicating the volume of capillary blood, a barcode or label (not shown in FIG.).

As noted, on case 1 of the microtube, risks are indicated indicating the volume of capillary blood in the microtube. The patented utility model is designed to store capillary blood until analysis in a volume of 100 to 1000 ml.

A removable locking cap 2 is mounted on the lower end of the housing 1 (Fig. 1), and a removable capillary 3 with a locking cap 4 is mounted on the upper open end.

To ensure accurate visual control of the volume of blood taken (this is especially important when taking blood volume of 100-200 ml), the bottom of the microtube is made at a height equal to the height of the closure cap 2 or closure cap 4 + 0.5-1 mm. It is significant that the execution of the bottom of the microtube at a height equal to the locking cap + 0.5-1 mm allows the use of this tube also for blood sampling and a larger volume.

The removable capillary 3 is made with an outer diameter of 2.9 mm, and the opening of the removable capillary 3 is made with a diameter of 1.9 mm, the wall thickness of the capillary is 0.5 mm. Accordingly (compared with the prototype) reduced the size of the holes for the capillary 3 in the locking cover 4.

Technical studies that were carried out by the applicant at the stage of development and testing of a patented microtube made it possible to establish that with a capillary diameter of 1.9 mm, its capillary properties significantly increase (almost 3-5 times), which allows to increase the speed and reduce blood sampling time and accordingly improve the operational convenience of the procedure.

The patented utility model provides for the possibility of producing capillaries 3 in two implementations: non-sterile and sterilized, which allows to increase the degree of protection of the patient and medical personnel when taking capillary blood.

A patented microtube provides for the use of a finely dispersed anticoagulant.

Fine anticoagulant can be applied:

- on the inner surface of the tube body 1 and is concentrated in the lower part of the tube body 1;

- on the inner surface of the capillary 3.

The size of the crystals of finely divided anticoagulant on the inner surface of the housing 1 of the tube and capillary 3 should not exceed 0.1 mm.

The total amount of anticoagulant should ensure the prevention of blood clots and platelet aggregation. Patented microtube provides the process of taking the exact volume of blood with an error of no more than ± 5%.

To ensure the convenience of operation of the microtube by medical personnel and to meet individual consumer needs, the utility model provides for the possibility of taking blood from a patient through a Zili capillary by gravity using a scapula 10.

The removable locking cap 2 is designed to be fixed on the open end end of the microtube and is made without a hole on the end surface, and the removable locking cap 4 (Fig. 3 (a, b, c) is designed to accommodate a capillary 3 and is made with a central hole on the end surface.

For fixing on the open end of the housing 1 of the locking caps 2 and 4 on the outer surface of the open end of the housing at a distance of the height of the locking cover, an annular supporting shoulder 5 is made (Fig. 1a), and an annular groove 6 is made in the upper closed end part of the locking covers 2 and 4 ( Fig. 3b), interacting when fixing the locking caps with the walls of the open end part of the microtube body 7 (Fig. 4b, c).

To unlock and remove the locking caps 2 and 4 on the outer surface of the upper open part of the housing 1 and on the inner surface of the locking caps 2 and 4, respectively, convex teeth 8 (Fig. 4c, d) and 9 (Fig. 3b) are arranged around the circumference.

To take capillary blood by gravity at the open end end 7 of the housing 1 of the microtube, a blade 10 is made (Fig. 2b; 4c, d).

It has been experimentally established that in order to ensure the optimal rate of entry (movement) of a blood drop into the cavity of the microtube body, the edge thickness of the scapula for gravity capture of capillary blood is 0.3 mm.

The blade edge thickness of less than 0.3 mm cannot be technologically obtained based on the physicomechanical properties of the polymer material.

With a blade edge thickness of more than 0.3 mm, capillary blood does not flow by gravity into the microtube cavity, but flows along the edge of the microtube body without flowing into the tube.

To unlock and remove the locking caps 2 and 4, the convex teeth 8 are made on the open end 7 of the housing 1 in the form of triangles 8 (Fig. 4c, d),

To unlock and remove the locking caps 2 and 4, the convex teeth 9 (Fig. 3b) of the locking caps 2 and 4 are made in the form of triangular protrusions, the tops of which are chamfered at an angle of 45 °.

The mechanism for unlocking and removing the locking caps 2 and 4, implemented in the patented utility model, makes them easy to open and minimizes the aerosol effect.

At the same time, the presence of chamfers at an angle of 45 ° on the tops of the triangular protrusions of the closure caps 2 and 4 allows for the automatic assembly of microtubes to significantly reduce the rejection of products and almost completely eliminate defects in the form of “jamming” and deformation of the edges of the closure caps 2 and 4.

As a result of technical studies, it was found that during automatic assembly of the patented microtube, the convex teeth of the top closure caps with a bevel at an angle of 45 ° provide reliable and stable “dressing” (fixation) of the closure caps on the microtube body. With other parameters without a chamfer, deformation and “firing” of the closure lid occur in approximately 5% of the manufactured microtubes.

To ensure reliable fixation of the removable locking caps 2 and 4 on the housing 1 of the microtube on the triangular teeth 8 in the upper open part 7 of the housing 1 of the tube protrusions 11 are made (Fig. 2a, b; 4b, c), and on the removable locking cap 2 (without hole ) and on the removable locking cover 4 between the teeth made protrusions 12 (Fig. 5B). When closing the tube with removable locking caps 2 or 4, a characteristic “click” is heard indicating the interaction of the protrusions 11 and 12 and ensuring the fixation of the locking caps 2 and 4 on the tube body 1.

For the convenience of placing the microtube on the laboratory bench, the lower closed part of the housing 1 is made in the form of a cylinder (Fig. 4b, c), or a rounded shape (Fig. 1b; 4a).

To facilitate the removal of the locking caps 2 and 4, convex protrusions are made on their outer surface around the circumference (Fig. 1a, c; 2a, b; 3a, c; 5a. C). The protrusions (not numbered in FIG.) Can be made vertical or inclined.

The expiration dates of microtubes and the series are indicated on each microtube.

Studies conducted by the applicant allow us to state that the patented design of the microtube provides the procedure for taking capillary blood from the patient and its storage without changing the parameters of the cellular composition of the blood for the time until the analysis. At the same time, the design of the microtube ensures maximum safety for both the patient and the medical staff working with blood from infection with dangerous infectious diseases such as AIDS, hepatitis, etc. Moreover, possible blood residues remain on the inner surface of the lid and do not come into contact with the operator’s fingers. The control of the sample volume is ensured by the presence of graduation, and the speed and ease of taking capillary blood is achieved.

The selection of capillary blood is carried out using a capillary 3 or by gravity using a scapula 10 as follows.

Capillary blood collection using a capillary 3.

With a scarifier, a puncture is applied to the fingertip (or in another place provided for blood sampling) and blood is drawn into the capillary 3, which is built into the closure cover 4. At the same time, the patient’s finger is held upright and a capillary is placed under a draining drop of blood 3. When a capillary sample is taken blood the best result is achieved with a horizontal or slightly inclined position of the microtube.

The sampling process is completed when capillary 3 is completely filled with capillary blood. To achieve an accurate dosage, air bubbles should be prevented from entering the capillary 3. By placing the microtube vertically, blood flows from the capillary 3 into the internal cavity of the housing 1 of the microtube.

After filling the cavity of the housing 1 with the required volume of capillary blood, the removable closure cover 4 with the used built-in capillary 3 is slightly turned, removed from the housing 1 and discarded.

Then, a removable locking cap 2 is removed from the lower end of the housing 1 and the microtube is tightly closed (until a corresponding click occurs) without having to turn the locking cap 2.

The resulting capillary blood sample is thoroughly mixed, gently shaking, but not shaking.

Blood collection by gravity.

To take capillary blood by gravity, a blade 10 is used, which is made on the open end end 7 of the housing 1 of the microtube (Fig. 2a, b; 4c, d).

Using a scarifier, a puncture is applied to the fingertip (or in another place provided for blood sampling) and blood is drawn into the cavity of the housing 1 of the microtube using the scapula 10. At the same time, the patient’s finger is held upright and a scapula 10 is placed under the draining drop of blood.

When taking a capillary blood sample, the best result is achieved with a horizontal or slightly inclined position of the microtube.

After filling the internal cavity of the housing 1 with the required volume of capillary blood, the closure cover 2 is removed from the lower end of the housing 1 and the microtube is tightly closed (until a corresponding click appears) without having to turn the closure cover 2.

The resulting capillary blood sample is thoroughly mixed, gently shaking, but not shaking.

The results of the experimental testing of the patented utility model, as well as the reviews of medical personnel and patients allow us to state that the patented microtube design provides:

- the execution of the procedure for taking capillary blood from a patient and its storage without changing the parameters of the cellular composition of the blood during the time until the analysis;

- maximum safety of both the patient and the medical staff working with blood from infection with dangerous infectious diseases such as AIDS, hepatitis, etc .;

- increased accuracy of the results of the analysis of capillary blood with a volume of 100-200 ml due to a clear visual control of the blood level in the microtube;

- obtaining reliable results of the analysis of capillary blood;

- increased usability of the patented microtube by medical personnel, since the patented utility model can be implemented both with a capillary and with a profiled blade at the open end of the microtube body, which allows medical personnel to choose the best microtube option;

- reliable fixation of the closure cap on the microtube body, which virtually eliminates the possibility of leakage of the capillary blood sample taken from the body cavity.

Claims (6)

1. A microtube for taking capillary blood, containing a cylindrical body, on the lower end of which is mounted a removable locking cap with a closed upper end surface, and on the upper open end is a removable capillary installed in the hole of a removable locking cap, for fixing on the open end of the closure covers on the outer surface of the open end of the housing at a distance of the height of the locking cover is made an annular supporting flange, and in the upper end part of the locking covers an annular groove is made, interactions a blade is used to take capillary blood by gravity on the open end end of the microtube body; a blade is made to unlock and remove the closure covers on the outer surface of the upper open part of the body around the circle, convex teeth in the form of triangles interacting when unlocking the locking caps with the corresponding convex teeth of the locking caps, made around the circumference on their inner surface, and for fixing and on the open end of the closure cap body with the upper end surface closed on the convex teeth of the upper part of the microtube body and on the convex teeth of this closure cap, protrusions are made that interact when fixing the closure cap, characterized in that the bottom of the microtube is made at a height equal to the height of the closure cap + 0.5-1 mm, the edge thickness of the scapula for taking capillary blood by gravity is 0.3 mm, and the removable capillary is made with an outer diameter of 2.9 mm, the opening of the removable capillary is made with a diameter of 1.9 mm, while the tops of the protrusions of the teeth of the locking caps are chamfered at an angle of 45 °. 2. The microtube according to claim 1, characterized in that the microtube is made of polypropylene. 3. The microtube according to claim 1, characterized in that the lower closed part of the housing of the microtube is in the form of a cylinder or a rounded shape. 4. The microtube according to claim 1, characterized in that the anticoagulant is applied to the inner walls of the microtube body and into the cavity of the capillary. 5. The microtube according to claim 1, characterized in that the capillary is sterile or non-sterile. 6. The microtube according to claim 1, characterized in that a graduation is performed on the microtube body indicating the volume of capillary blood contained in it.

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