Blood pressure measuring device

Abstract

This utility model relates to medicine, specifically to devices for non-invasive measurement of intravascular venous and arterial pressure, as well as tissue deformation under external compression. The blood pressure measuring device consists of two components connected by straps with textile fasteners. The first component is an inflatable latex rubber bladder enclosed in a non-elastic cover and connected via latex rubber tubes to a pressure gauge and an air inflation device. The second component is a junction of two identical components, consisting of two rectangular fabric layers stitched along the perimeter, with sections of textile fastener strap sewn onto identical sides, and a transparent polyvinyl chloride insert for a linear ultrasound scanner sensor, glued and sewn between the two identical fabric components.Moreover, on one side of the non-elastic cover of the first part, the textile fastener straps are symmetrically arranged, and on the opposite side of the non-elastic cover, the textile fastener straps are symmetrically arranged on one of the halves of that side. The technical result consists in achieving the ability to measure pressure in various areas of the patient's body. 7 fig.

Description

[0001] The utility model relates to medicine, namely to devices for non-invasive measurement of intravascular venous and arterial pressure, measurement of tissue deformation under external compression.

[0002] The prototype of the utility model is patent EP 1194071 B1 of 06.07.2020, which describes a method and apparatus for measuring blood pressure.

[0003] This device consists of a fabric cuff with an elastic inflatable reservoir, connected by rubber tubes to a pressure gauge and an inflation / deflation device. A transparent insert, made of a material permeable to waves or radiation from the recording device (ultrasound scanner), is located in the center of the inflatable reservoir. The cuff size, depending on the diameter of the limb being examined, is adjusted using a textile fastener.

[0004] The device described above has the following disadvantages: the location of the transparent insert for the linear ultrasound scanner sensor in the central part of the inflatable reservoir does not ensure adequate contact with the skin, since when air is pumped, the volume of the inflatable reservoir increases, including its thickness, while the thickness of the transparent insert remains unchanged, which will inevitably lead to an increase in the distance between it and the skin and, accordingly, to a complete or partial loss of contact, even in the presence of a sound-conducting contact medium; an increase in the volume of the inflatable cuff sections surrounding the transparent insert helps to reduce the stretching of the latter and weaken its pressure on the underlying tissues.Therefore, tissue deformation in the area of ​​the transparent insert will not correspond to the pressure exerted by the cuff, rendering measurement results unreliable. The fixed loop and hook fastening system limits the cuff's possible diameter, reducing the cuff's ability to securely fit and limiting its application on the extremities.

[0005] The technical problem is to expand the arsenal of technical means for measuring pressure in different parts of the patient's body.

[0006] The technical result consists in achieving the ability to measure pressure in various parts of the patient's body.

[0007] The device is made in the form of two separate parts.

[0008] The first component is a latex rubber bladder measuring 22 x 12 cm, connected via pipes made of the same material to a pressure gauge and a device for pumping / deflation of air. The bladder is enclosed in a non-elastic fabric cover measuring 31 x 13.5 cm, allowing it to expand freely to a pressure of 300 mmHg. A unique feature of the bladder cover is that on one side, 13 x 10.5 cm textile fastener straps are symmetrically located relative to the bladder. One of the straps contains "micro-loops," the other "micro-hooks." On the opposite side of the non-elastic cover, on one half, 6.5 x 10.5 cm textile fastener straps are symmetrically located in the same combination.

[0009] The second part is a combination of two identical fabric elements and a polyvinyl chloride (PVC) insert. These elements are composed of two layers of fabric, similar to that used to make the cover of the inflatable chamber, stitched along the perimeter, in a rectangular shape, measuring 26.5 x 13.5 cm. A piece of tape measuring 25.5 x 10.5 cm with "micro-hooks" is sewn onto one side of one of these elements, and a piece of textile fastener with "micro-loops" is sewn onto the same side of the other element, which is of the same size. A transparent PVC insert measuring 12 x 13.5 x 0.08 cm is glued and sewn between these fabric elements. When joined together, the elements form the second part of the device, measuring 62 x 13.5 cm.

[0010] The textile fastener straps of the first part, when connected to the textile fastener straps of the second part, produce the first version of the tonometer, with a cuff length ranging from 62 cm (approximately 20 cm in diameter) to 36 cm (up to 11.5 cm in diameter), which is accompanied by a reduction in the transparent insert to 4 x 13.5 cm (4 cm is the average length of the linear transducer of an ultrasound scanner). A tonometer with these cuff dimensions is suitable for examining objects of large and medium diameters.

[0011] When the fastener straps are connected to each other, the first part is transformed by folding it in half and fixing the halves together, which reduces the size of the first part to 15.5 × 13.5 cm. This leaves the fastener straps on the other side free, allowing the second part to be attached to them with fastener straps, resulting in a second version of the tonometer with a working surface length of 25 cm (approximately 8 cm in diameter) when the first part is transformed and the element retains a full-size transparent insert (8 × 13.5 cm) and up to 17 cm (approximately 5.4 cm in diameter) when leaving a minimal transparent insert (4 × 13.5 cm), which is convenient for examining objects of medium and small diameters. The additional fixation of the second part to each other provides additional strength to the cuff in this version of use.

[0012] Fig. 1 shows a front view of the first part of the tonometer, where there is an inflatable chamber made of latex rubber 1, a pressure gauge 2, an air inflation / deflation device 3, a fabric cover 4, a textile fastener tape on the front side of the first part 5, and a textile fastener tape on the back side of the first part 6.

[0013] Fig. 2 shows a view of the first part of the cuff from the back, where there is an inflatable chamber made of latex rubber 1, a pressure gauge 2, a device for pumping / deflating air 3, a fabric cover 4, a textile fastener tape on the front side of the first part 5, a textile fastener tape on the back side of the first part 6.

[0014] Fig. 3 shows the second part of the tonometer, where the fabric element (part) of the second part is 7, the polyvinyl chloride (PVC) transparent insert is 8, and the textile fastener tape of the second part is 9.

[0015] Fig. 4 shows the first variant of connecting the parts of the tonometer (study of objects of large and medium diameter), where the textile fastener tape is on the front side of the first part 5, the textile fastener tape is on the second part 9.

[0016] Fig. 5 shows a diagram of the use of the first variant of connecting the parts of the tonometer in combination with ultrasonic scanning (examination of objects of large and medium diameter), where the inflatable chamber made of latex rubber 1, the pressure gauge 2, the device for pumping / deflecting air 3, the fabric cover 4, the textile fastener tape on the front side of the first part 5, the textile fastener tape on the back side of the first part 6, the fabric element (part) of the part 7, the polyvinyl chloride (PVC), transparent insert 8, the textile fastener tape of the second part 9, the ultrasonic scanner sensor 10.

[0017] Fig. 6 shows a second variant of connecting the parts of a tonometer (study of objects of medium and small diameter), where the textile fastener tape is on the front side of the first part 5, the textile fastener tape is on the back side of the first part 6, and the textile fastener tape is on the second part 9.

[0018] Fig. 7 is a diagram of the use of the second variant of connecting the parts of the tonometer in combination with ultrasonic scanning (examination of objects of medium and small diameter), where the inflatable chamber made of latex rubber 1, the pressure gauge 2, the device for pumping / deflecting air 3, the fabric cover 4, the textile fastener tape on the front side of the first part 5, the textile fastener tape on the back side of the first part 6, the fabric element (part) of the part 7, the polyvinyl chloride (PVC), transparent insert 8, the textile fastener tape of the second part 9, the ultrasonic scanner sensor 10.

[0019] An example of making the device is as follows:

[0020] Making the first part:

[0021] - sewing textile fastener tapes onto the front and back blanks for the inflatable chamber cover (a dense, non-stretchable fabric is used);

[0022] - stitching the blanks together to form a cover with an opening through which a latex rubber chamber could be placed inside, connected by pipes to a pressure gauge and a device for pumping / bleeding air.

[0023] Making the second part:

[0024] - gluing the front and back blanks of the fabric elements (a dense, non-stretchable fabric is used) to the edges of the opposite sides of the PVC insert;

[0025] - stitching the blanks together with stitching the glued sections of the PVC insert;

[0026] - sewing textile fastener tapes onto the same surfaces of fabric elements.

[0027] Stages of applying the device to the limb:

[0028] - selection of “zone of interest”;

[0029] - application of a sound-conducting medium to the “zone of interest”;

[0030] - superimposing the second part of the tonometer on the “zone of interest” with the area of ​​the transparent PVC insert;

[0031] - evaluation of limb diameter using the second part;

[0032] - attaching the first part in its original or modified version (depending on the diameter of the limb);

[0033] - fixing the free sections of the textile fastener of the second part between themselves (if possible);

[0034] - measurement of pressure and other parameters in the “zone of interest”.

[0035] Description of clinical application of the device

[0036] Patient K., 59, presented with a diagnosis of a recurrent trophic ulcer of the medial surface of the lower right leg, post-thrombophlebitic changes in the deep veins of the right lower extremity (LE), secondary varicose veins of the saphenous veins of the right LE, and a condition following ligation of the perforating veins of the right leg. The diagnostic methods used could not provide accurate information on the collateral venous outflow pathways through the saphenous veins of the extremities. Therefore, a tonometer with a two-component cuff with a transparent insert was used. Its design allowed it to be applied to all areas of interest on the right leg and accurately measure occlusion pressure in each perforating vein, the trunk, and tributaries of the small and great saphenous veins in the immediate vicinity of the ulcer defect and in its projection, in both clinostasis and orthostasis.The obtained results allowed us to reliably identify areas of the venous bed with the most pronounced occlusive pressure, which resulted from the highest blood flow velocity in these vascular segments, and to obtain an accurate understanding of the main collateral outflow pathways. This, in turn, made it possible to exclude the maximum number of subcutaneous and perforating veins from the local blood flow in the ulcer defect area by performing endovascular laser coagulation and miniphlebectomy, without affecting the main collateral pathways. The result is the absence of ulcer recurrence over the 13 months following surgery to date, a progressive reduction in pigmentation in the projection of the epithelialized ulcer defect, and tissue edema in its projection.

[0037] This confirms the solution to the technical problem of expanding the range of technical means, which is confirmed by the technical result that allows solving the said problem, namely the creation of a new device for reliably measuring pressure on various parts of the body.

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