Acoustical method for measurement of arterial pressure and other physical parameters of blood and cardiovascular system

FIELD: medicine.

SUBSTANCE: acoustic sensor is placed. Continuous infrasound recording is performed with a wideband acoustic sensor. Arterial pressure is measured by a nonlinear relationship between pressure and artery diameter for longitudinal waves according to the Navier-Stokes equation. For this purpose, the acoustic pressure measurement is carried out evenly at a predetermined interval. The obtained values are processed by a digital filter with a finite-impulse response. After digital filtering, the resulting series of numbers form time series of pressure and acoustic pressure values. Further, the arterial pressure is calculated from the obtained time series according to the claimed formula.

EFFECT: device allows non-invasive and continuous measurement of arterial pressure by using a nonlinear relationship between pressure and artery diameter for longitudinal waves according to the Navier-Stokes equation.

5 dwg

 



 

Same patents:

FIELD: medicine.

SUBSTANCE: invention relates to means for carrying out visualisation-guided medical procedures. Method of processing X-ray image contains stages, at which: 2D X-ray image of anatomical area, which includes ultrasound probe, is received, ultrasound probe s detected on it, ultrasound probe is superposed with reference coordinate system, with taking into account evaluation of position and orientation of ultrasound probe relative to reference coordinate system. Superposition stage additionally contains stage, at which presented in digital form projection of 3D model of ultrasound probe is correlated with ultrasound probe detected on X-ray image, with obtaining evaluation of ultrasound probe position and orientation from correlated 3D model. Computer-readable carrier contains stored in it sets of instructions for system-processing unit for combination of ultrasound and X-ray images, which contains X-ray system of 2D X-ray image, ultrasound system, including ultrasound probe, processing unit and monitor for combined image presentation.

EFFECT: application of invention makes it possible to increase accuracy of position determination.

9 cl, 4 dwg

FIELD: medicine.

SUBSTANCE: nephrosonography is performed to determine a kidney volume (V pk, mm3). Child's height and age are specified and used to determine a reference kidney volume (V rk, mm3), to calculate a kidney volume coefficient (Kkv) by formula: , wherein Kkv is the kidney volume coefficient; V pk is the patient's kidney volume, mm3, and V rk is the reference kidney volume, mm3. In the unilateral ureteral obstruction, a healthy kidney volume coefficient (Khkv) and a obstruction kidney volume coefficient (Kokv) are calculated. If K hkv is more than 1.0, the absence of compensatory hypertrophy and hyperfunction is diagnosed; the morphofunctional kidney condition from the side of an obstructed ureter occurs to be noninvolved; the conservative treatment of the obstruction is preferred. If K hkv is more than 1.0 and less than 1.8, K okv is more than 1.0, compensatory hypertrophy and hyperfunction of the healthy kidney; the morphofunctional kidney condition from the side of the obstruction is depressed; a preserving surgery is chosen. Khkv between 1.8 or 2.0 and Kokv less than 1.0 enable diagnosing manifested compensatory hypertrophy and hyperfunction of the healthy kidney; kidney downsizing, functional depression are diagnosed from the side of the obstruction, and a nephrectomy is preferred.

EFFECT: method enables choosing the therapeutic approach to the ureteral obstruction in the children by detecting the clinical manifestations of the urinary outflow obstruction.

4 ex

FIELD: medicine.

SUBSTANCE: invention relates to medicine, namely to ultrasonic diagnostics, neurosurgery, vascular surgery and neurology. Colour duplex scanning in horizontal and vertical position of patient is performed. Pathological tortuosity is diagnosed in case of presence of deformation of main neck arteries with angle of tortuosity less than 60° in horizontal and vertical positions, turbulence of blood flow in area of tortuosity, more than 50% acceleration of systolic blood flow in area of deformation in comparison with proximal part of artery, reduction of blood flow rate more distally than tortuosity in comparison with proximal part of artery to tortuosity more than 20%.

EFFECT: method makes it possible to increase diagnostics accuracy due to change of hemodynamics under impact of change of patient's body position.

4 ex

FIELD: medicine.

SUBSTANCE: invention relates to medical equipment, namely to diagnostic ultrasound systems. Curved converter of high-intensity focused ultrasound (HIFU) contains curved piezoelectric matrix, which has opposite convex and concave surfaces, with concave surface being transmitting surface, and multitude of zones of acoustic transmission. Multitude of electrodes is located on surfaces of curved piezoelectric matrix. Curved adjustment layer, formed in monolithic, continuous way, is formed with required curvature of curves matrix of converters, and is attached to transmitting surface. Printed circuit board and back plate are located on side of matrix, opposite to adjustment layer, with back plate limiting air channel between printed circuit board and plate, and printed circuit board limits air channel between printed circuit board and matrix.

EFFECT: application of invention makes it possible to facilitate giving required shape to converter.

15 cl, 13 dwg

FIELD: medicine.

SUBSTANCE: neurovisualisation examination of brain is carried out, Cirs comorbidity index and Kaplan-Feinstein comorbidity index are determined, cochleovestibular syndrome, eye-moving impairments, type of diabetes mellitus are identified. Value of discriminate function (D) is calculated. If D value is higher than zero, diagnosed are consequences of ischemic brain stroke (IBS) with hyperhomocysteinemia (HH), if D is lower than zero, consequences of IBS without HH are diagnosed.

EFFECT: method makes it possible to increase reliability of diagnostics of IBS consequences, which is achieved due to complex analysis of said parameters.

2 ex

FIELD: medicine.

SUBSTANCE: inner angle (α) between back surfaces of an episternum and a mesosternum is preoperatively ultrasonically measured in a patient. A spiral oesophagomyotomy is performed. Tendons of the sternum legs of sternocleidomastoid muscles are dissected away from the episternum. A retrosternal tunnel is created. If α<165°, the episternum is dissected away at the level of a lower edge of the second rib. If α>165°, the episternum is dissected away at the level of a lower edge of the first rib. A colonic graft is delivered onto the neck through the retrosternal tunnel. An end-to-end anastomosis is applied between a cervical segment of the oesophagus and the colonic graft.

EFFECT: reducing invasiveness and postoperative complications by an individual approach to determining the episternum resection extent.

2 ex

FIELD: medicine.

SUBSTANCE: direct size between the most distant points of a presenting segment of the foetus head at the level of the sagittal plane, large transverse size of the foetus head between the most distant points of the parietal tubers, transverse size of the shoulders between the most distant points of the acromial processes and the anteroposterior size of the foetus chest at the level of VII thoracic vertebra and the base of the xiphoid process are determined. A probability coefficient of the foetus shoulder dystocia is calculated by a mathematic formula. Development of the foetus shoulder dystocia is made on the basis of the obtained coefficient value.

EFFECT: method makes it possible to predict the development of the foetus shoulder dystocia due to the evaluation of the significant ultrasonic indices in the foetus.

1 tbl, 4 ex

FIELD: medicine.

SUBSTANCE: ultrasonic examination of brachial artery is realised. During ultrasound examination lumen of brachial artery in systole and diastole is determined, reactive hyperaemia test and test with nitroglycerinum intake are performed. After that, values of lumen, obtained before performing test and after them, are compared. Presence of endothelial dysfunction is identified on the basis of degree of obtained data change. If value of brachial artery diameter after reactive hyperaemia test is less than 12% in systole and less than 13% in diastole, as well as after intake of nitroglycerinum, if value of brachial artery diameter in systole is less than 20% and less than 21% in diastole, endothelium dysfunction is diagnosed.

EFFECT: method provides detection of affection of vessel wall in said category of patients at the earliest stages.

2 ex

FIELD: medicine.

SUBSTANCE: predicting neonatal hypoglycaemia in an infant born by a woman suffering diabetes mellitus in the stages of at least 36 weeks of pregnancy is ensured by foetal ultrasonic scanning. A pancreatic gland (PG) is visualised in a cross-section of the foetal abdomen. Its maximum anterior-posterior dimension is measured at the body level, and if its dimension is more than 1.55 cm, the neonatal hypoglycaemia is predicted. In a particular case, the PG is visualised better if displaying the cross-section of the foetal abdomen at the level of a stomach and an intra-abdominal segment of an umbilical vein is followed by rocking and rotating an ultrasonic probe.

EFFECT: method enables improving the early postnatal adaptation, preventing the postnatal complications, incidence of disease and death caused by the hypoglycaemic conditions in the newborns born by the women suffering diabetes mellitus by correcting them timely due to the accurate prediction of developing neonatal hypoglycaemia starting from the stage of 36th week of pregnancy.

2 cl, 3 ex

FIELD: medicine.

SUBSTANCE: patient's serum asparagine aminotransferase (AST) is measured. That is combined with duplex scanning to measure a splenic vein diameter (SVD) and a body weight. The measured AST, SVD and body weight are used to calculate a fibrosis index by formula: FI=-6.31+0.19*AST-1.02*SVD+0.24*BW, wherein FI is the fibrosis index, -6.31 is a constant, 0.19-1.02 and 0.24 are the coefficients, AST is blood serum asparagine aminotransferase (Unit/l), SVD is the splenic vein diameter (mm), and BW is the patient's body weight (kg). The constant and coefficients in the presented formula are calculated by multiple regression method; a dependent variable is a liver density value according to ultrasonic elastography findings. If the derived fibrosis index is less than 6.3, the absence of fibrosis (stage F0) is stated. If the fibrosis falls within the range of 6.3 to 8.3, the first stage of fibrosis (F1) is diagnosed. The fibrosis index of 8.4 to 10.8 corresponds to the second stage of fibrosis (F2). The fibrosis index of 10.9 to 13.9 corresponds to the third stage of fibrosis (F3). If the fibrosis index is more than 13.9, hepatic cirrhosis (stage F4) is diagnosed.

EFFECT: technique provides the adequate differentiation of the fibrosis stages in the patients with chronic viral hepatitis by the complex assessment of biochemical, ultrasonic and antropometric parameters.

5 ex

FIELD: medicine.

SUBSTANCE: group of inventions relates to medicine. Respiration monitor contains first sensor, made with possibility of generating signal of monitoring of respiration-related movements, indicating respiration-connected movements; second sensor, made with possibility of generating signal of noise monitoring, indicating respiration-related noises; as well as signal synthesiser, made with possibility of synthesising signal of respiratory monitor based on the signal of monitoring of respiration-related movements and signal of monitoring of respiration-related noises. Sensor for application in respiration monitoring contains accelerometer and magnetometer, collectively determining single sensor, made with possibility of fixation to respiration-performing object in such a way as to travel as unit, responding to respiration-related movements of respiration-performing object.

EFFECT: group of inventions makes it possible to increase resistance to movements or change of position of object, subjected to monitoring.

15 cl, 3 dwg

FIELD: medicine.

SUBSTANCE: invention refers to medicine, and may be used for the prevention of haematogenous metastasis of gastrointestinal tumours. A sterile self-adhesive dressing 6×4 cm is placed with an adhesive side upwards under a hepatoduodenal ligament. A sterile silicone tube 1 metre long is laid with its one end on the dressing not less than 2 cm from the border, while the other end is coupled with an infusion pump syringe; the dressing is wrapped above the hepatoduodenal ligament thereby gluing the free borders together so that the tube is placed inside the dressing. An inspection, mobilisation and extraction of the tumour is accompanied by introducing a chemopreparation solution inside the dressing using the infusion pump. The dressing is exposed to ultrasound generated by an apparatus operating at 880 HZ, 0.4 Wt/m2 with mobilising the vessels and extracting the tumour.

EFFECT: method allows reducing a risk of metastasis.

1 ex

FIELD: medicine.

SUBSTANCE: invention relates to veterinary. Method includes auscultation of noises of blood vessels in pelvic cavity by means of device and computer analysis of obtained signal. Construction of amplitude-frequency characteristic of noises is performed. Obtained characteristic is compared with the standard. If peaks in zone of 200 Hz and 2000 Hz, which exceed main curve of amplitude-frequency characteristic by more than 4 dB, are present conclusion about presence of pregnancy is made.

EFFECT: method extends arsenal of methods for diagnosing pregnancy in cows.

1 tbl, 3 dwg

FIELD: medicine.

SUBSTANCE: invention relates to medicine, namely to dentistry and is intended for setting prosthetic upper plane in patients with damaged integrity of dentitions. Device represents device, including table, installed on post and base. Table is fixed to post via fixable horizontal hinge, providing possibility of sloping table with respect to post axis in vertical plane. Post is connected with base plate by means of fixable horizontal hinge to provide possibility of table rotation in horizontal plane around post axis. Plate is connected with base with possibility of fixed travel with respect to base in horizontal direction.

EFFECT: invention makes it possible to align clinically determinable prosthetic plane for further treatment of patient due to setting slope of occlusion table, on which model of upper jaw is located.

2 dwg

FIELD: medicine.

SUBSTANCE: invention relates to field of medical equipment and represents phonocardiological attachment to electrocardiograph. Attachment contains successively connected amplifier, unit of band filters and unit of analogue-to-digital converters. Attachment also includes control unit, core storage and matching amplifiers unit, whose outlets are attachment outlets. In addition, attachment is provided with measuring probe, consisting of metal case, inside which working and background microphones with inbuilt pre-amplifiers are located. Microphones are placed into sound locators and are connected via coupling capacitors with inlets of bridge circuit power supply diagonal, outlets of whose measuring diagonal are connected by means of screened cable with inlets of amplifier. Probe case is grounded via screening cable. Sound locators are made from sound-insulating material. Sound locator of working microphone is open from butt end side, and is closed from rear butt end side with layer of sound-insulating material. Sound locator of background microphone is closed from both butt end sides with layer of sound-insulating material.

EFFECT: application of the invention makes it possible to increase accuracy of registration of weak tones and noises of internal organs and vessels in humans.

4 dwg

FIELD: medicine.

SUBSTANCE: invention concerns medicine (functional diagnostics), particularly methods of auscultative body parameter reading, transfer and record for humans and laboratory animals (biological objects). Invention can be applied both in experimental environment and in exhaust operation of pressure chamber. Method of indirect auscultation involves data reading and transfer in the form of electric signals from mutated gas environment of sealed object (pressure chamber) to outer space by sealed inputs, hardware amplification, software amplification, noise filtering, graphic presentation and recording in PC files, and sound reproduction. Inside sealed object (pressure chamber) sound undergoes reading and primary amplification by microstethoscope cone, is further transferred to sealed high-sensotovity carbon microphone connected to it, where sound oscillation is converted into electric signal. This signal is transferred to outer space by two-core wire through sealed inputs of pressure chamber. Signals from external contacts of sealed inputs are transferred to power amplifier mounted outside the pressure chamber and further either to sound reproduction devices (head phones, acoustic dynamics) for immediate listening or to sound card of personal computer. Auscultation is performed directly by exhaust operators, maintenance medic monitors procedure implementation from outside of sealed object and controls actions over communication means.

EFFECT: accelerated diagnostics and treatment actions, simplified auscultation procedure.

2 dwg

FIELD: medicine.

SUBSTANCE: method and system analyse sounds generated, at least, in part of human cardiovascular system. N of converters, where N is an integer, are fixed on body surface within breast region. The i-th converter is fixed in position xi and generates initial signal P(xi, t), expressing compression waves in position xi, where i=1...N. Signals P (xi, t) are processed to shape filtered signals, wherein at least one component of signals P(xi, t), not generated by cardiovascular sounds, is removed. The filtered signals can be used for imaging of, at least, part of cardiovascular system.

EFFECT: higher accuracy of moving image analysis.

42 cl, 6 dwg, 2 ex

FIELD: medicine, surgery.

SUBSTANCE: it is necessary to cannulate portal vein and the inferior vena cava at the background of intact circulation under conditions of lateral squeezing out and connect with the help of two T-joints together and, also, with a cannula introduced into atrium dextrum, and the system for heparinization and control for the by-pass permeability. Moreover, the veins should be intersected being distally the areas of their cannulation after activating the system of temporary vascular shunting, and its functioning should be maintained in the course of the whole ahepatic period of the operation before final stage of vascular reconstruction. After that cannulas should be successively removed out of veins' lumen under condition of their lateral squeezing out. The innovation enables to decrease hemodynamic and thrombotic complications, exclude the syndrome of reperfusion and carry out local heparinization of by-pass system.

EFFECT: higher efficiency.

8 dwg, 1 ex

FIELD: medicine, diagnostics.

SUBSTANCE: the suggested method deals with stimulation of tympanic membrane fluctuations due to the action of sound impact with possibility to alter not the intensity only, but the frequency of sound impact, also, followed by irradiation of tympanic membrane with laser radiation, direction of reflected radiation into laser resonator, registration of altered power of laser radiation as electric signal, division of registered signal into spectral constituents, alteration in the intensity of sound impact till the stoppage of amplitude growth of spectral component having maximum value, the calculation of fluctuation amplitude of tympanic membrane ξalt due to applying the obtained spectral constituents of the signal. The innovation provides higher sensitivity of performed measurements at providing the chance to carry out measurements in vivo.

EFFECT: higher accuracy of measurement.

5 dwg

The invention relates to medical equipment and can be used both individually and in health centres, designed to work with future mothers during pregnancy

FIELD: medicine.

SUBSTANCE: group of inventions relates to medicine, namely to cardiology. A microphone signal, simultaneously passing through two band filters with fixed pass bands, is registered. The pass band of the first pulse-wave filter is set at 3-6 Hz. The pass band of the second filter of Korotkov′s tones is set at 40-120 Hz. Reliable Korotkov′s tones in the determination of systolic pressure are considered to be exceeding of a threshold value of the amplitude of the first filter output signal after the local maximum of the output signal of the first filter. The reliable Korotkov′s tones in the determination of diastolic pressure are considered to be exceeding the threshold value of the amplitude of the output signal of the second filter to the local maximum of the first filter output signal. The claimed method is realised due to the device, which includes an air pressure sensor in a cuff, a microphone, the first pulse-wave filter has the pass band of 3-4 Hz, the second filter of the Korotkov′s tones has the pass band of 40-120 Hz, a unit for the determination of maximal values of output signals of the filters, a unit for the selection of the threshold values of comparison of the output signals of the filters, a unit for the comparison of the output values of the output signals of the filters with the threshold values, a unit for the comparison of the moment when the threshold value of the output signal of the second filter is exceeded, with the moment of achieving the local maximum of the first filter.

EFFECT: group of inventions makes it possible to increase the reliability of measurements due to the reduction of the impact of external noise and interference, conditioned by the patient's physiological activity.

2 cl, 2 dwg

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