Defibrillator with safe discharge contour, containing h-shaped bridge electric scheme

FIELD: medicine.

SUBSTANCE: invention concerns medicine area, namely to area of urgent cardiological resuscitation. The heart defibrillator for treatment of the patient in case of cardiovascular activity termination by means of the shock blow provided with the dosed out diphasic electric discharge of high-voltage condenser through the H-shaped bridge circuitry, contains the high voltage commutator A, B, C or D in each of the branches. According to the invention each of opposite polarity phases of a diphasic shock blow is managed in two stages on time in such a manner that for each pair of the commutators concerning the given phase, the first of pair commutators is changed over in leading state and remains leading during all this phase whereas the second commutator of this pair is shorted with some time delay in relation to the first commutator throughout some operated duration for establishment of a current flow through a body of the patient during this phase, and the second phase is processed in the same way by means of other pair of commutators.

EFFECT: wide use of the defibrillation device.

13 cl, 6 dwg

 

The technical field

The invention relates to medicine and, more specifically, to the field of emergency cardiac resuscitation in case of stopping the activity of the cardiovascular system of the patient due to ventricular (ventricular) atrial or ventricular tachycardia, and an object of this invention is an external cardiac defibrillator.

Prior art

Urgent cardiac defibrillation has become widely known in recent years and is widely used.

Cardiac defibrillation is the only means of eliminating heart attacks resulting from ventricular fibrillation or ventricular tachycardia, which will inevitably lead to a fatal outcome if not eliminate them through defibrillation shock for a time not exceeding a few minutes.

Initially, about ten years ago, the use of defibrillators was limited and was only paramedics, because only they were competent to use such equipment and they only had this instrument.

Because this situation was not quite satisfactory considering the fact that really there is only a small chance that an emergency doctor can be months the e incident in a short time, in order to save the patient, first of all installation has been accepted for the use of the AED for professional rescuers, for example, professional firefighters, which is much more than emergency physicians, and which provide much broader coverage than it can do EMTs. The machines are widely used at the present time, the staff are defibrillators so-called semi-automatic type (DSA). The principle of operation of apparatus of this type is that such a device automatically detects the disorder of heart rhythm, which requires defibrillation, and makes recommendations to the rescuer to use the shock of the blow.

At a later stage, semi-automatic defibrillators type began to spread among wider sections of users up to ordinary people: these semi-automatic machines DS became known by the acronym D (English term "ubli ss Dfibrilltr"), i.e. apparatus for defibrillation, which can be used by ordinary people who have received at least a minimal education in the area of salvation.

The above-mentioned types of devices intended for defibrillation, namely, apparatus type DS or D assume, of course, the presence of a third is a ne, located in the immediate vicinity of the victim stops cardiovascular activity and has such a device.

Since this condition is unacceptable in cases where patients are prone to bouts of atrial fibrillation, which can occur at any time, was provided by implanting suitable for installation of an automatic defibrillator, which ensures the formation of shock shock if necessary. However, since the implantation of such a device is a severe and invasive surgery for the patient, had developed an alternative device intended for such patients are susceptible to recurring bouts of atrial and, if necessary, in anticipation of implantation of embedded defibrillator, which is an external automatic apparatus worn by the patient.

Such a device is described, for example, in the patent document EP 1064963 in which the disclosed apparatus is that the patient is constantly carries and which continuously monitors heart rhythm that person, with the apparatus in the event of the patient's ventricular fibrillation is able to automatically include defibrillation shock through electrodes placed on the chest of the patient.

Brief situ is a group of beings inventions

The technical task of the invention is the creation of different types of defibrillators, regardless of whether they are external for use by third persons representing medical or rescue services used in the hospital or outside, or they will be external and constantly carry with you patients, or they will be implanted, and the creation of defibrillators, which has the function of stimulating the heart rate, which are often classified in the category of defibrillators, which is unique.

The present invention relates to a heart defibrillator is intended for treatment of a patient in case of stop cardiovascular activity due to ventricular fibrillation or ventricular tachycardia by at least one biphasic defibrillation shock generated by waves with at least two phases of opposite polarity, i.e. the shock of the blow received by the bridge electric circuit H-shaped form containing two pairs of switches, high voltage, and the defibrillator is characterized by the fact that each of the opposite phases of a two-phase wave is controlled in two stages in time so that for each pair of switches, high voltage, suitable for the processes of this phase one of the switches that couple the first time became conductive and remains conductive during the entire phase, and the second switch of the high voltage of this pair, which is connected in series in the circuit, including the patient, was closed at the second stage, to ensure that during the second phase when an electric current passes through the patient's body.

Bridge electric circuit H-shaped form is composed of the four switches a, b, C and D, and shock can be used on the load, which is external to the apparatus through the pavement wiring diagram H-shaped. Each of the two switches a and b are connected on one side to the high voltage power capacitor CHT at the point Z, and, on the other hand, respectively, to the points X and Y that are intended for connection with the load, which is external to this unit. Each of the other two switches C and D is connected on the one hand, respectively, with points X and Y, are used for connection with an external load, on the other hand with the point W, which is connected with the mass and having a lower electric potential than the point Z. the Pair of switches a+b and b+C are used, respectively, to implement the first and second phases of each pulse defibrillation. The control circuit providing the em management for each phase of the operation of one of switches a or b thus, in order to ensure their individual switching for inclusion during the corresponding phase of two-phase wave. The control circuit provides control switches C and D, through which the switching from the original open state to a closed state, during which continues the successive phases of a biphasic wave, but only after closure of the switch a or b, respectively.

Brief description of drawings

The invention will be better understood from the following description of preferred and non-limiting examples of implementation, with reference to the accompanying drawings, in which

figure 1 depicts a schematic diagram of an electrical bridge H-shaped form, intended for the formation of a biphasic defibrillation pulse through the body of the patient using a defibrillator, according to the invention;

figure 2 depicts a more detailed electrical diagram of the circuit using electrical bridge H-shaped form, intended for the formation of a biphasic defibrillation pulse through the body of the patient using a defibrillator, according to the invention;

figure 3 depicts a timing diagram of the control of four bridge switches electric circuit H-shaped in that particular case, when both Podles is appropriate to ensure the phase is discontinuous or fractional, according to the invention;

figure 4 depicts a circuit diagram of an example implementation that uses the fifth switch, representing a transistor type IG whose function is to interrupt the high voltage supplied to the pavement wiring diagram H-shaped form, before and after the shock of the blow, according to the invention;

figure 5 depicts a simplified electrical circuit, limited only by the Central part of the circuit without balancing the electrical resistances representing the branch of reducing electrical interference from high-voltage electric charge of the capacitor, and a separating bridge circuit providing a control transistor type IG, according to the invention;

6 depicts chronographically diagram of the electric current passing through the body of the patient during shock shock defibrillation with intermittent pulses, according to the invention.

Description of the preferred embodiment variants of the invention

Figure 1 shows a high-voltage electrical capacitor CHT, which supplies electrical bridge circuit H-shaped, formed by four switches a, b, C and D, which can be controlled via four control lines, respectively. High electric voltage is tion, coming from the capacitor CHT, is applied to the upper point Z bridge electric circuit H-shaped with respect to the weight associated with the point W at the bottom of this bridge circuit H-shaped. Intermediate point between switches a and C indicated by the position X, and the intermediate point between switches b and D indicated by the position Y. At this point X and Y form a diagonal of the bridge electrical H-shaped form, which is oriented in the direction of the patient's body. In a more detailed electrical diagram shown in figure 2, are given by way of example, the four switches of the bridge electric circuit H-shaped form, namely, switches a, b, C and D, formed of four high-voltage semiconductor switching components with management or with the power on when the external signal, for example, bipolar transistors with an insulated control electrode, known in the art under the name IG that will be used later.

High-voltage electrical resistance of large magnitude RA, R, RC and RD (e.g., 40 MW) are connected in parallel between the collector and emitter of each transistor IG, respectively a, b, C and D, in order to have a well-defined electrical potential between the transistors IG open condition. It provides the, on the one hand, to ensure a more reliable and stable operation, and on the other hand, measuring the electrical stresses at junctions, to identify possible failures of transistors IG, in particular, a possible short circuit.

These electrical resistance is schematically presented in figure 4 is not attached to the scheme, as they are optional elements.

Consideration was also given to the use of electric leak resistance (internal resistance in a blocked state), private for each transistor IG, instead of the resistances RA, R, RC and RD used to balance the bridge circuitry. The principle of operation remains the same. It is enough to take into account the variance of the values of electrical resistance leakage transistors IG in the measurement process.

This version of the implementation is presented in figure 5. However, this resistance leakage is difficult to control the semiconductor devices, and it may vary as a function of temperature and electric voltage applied to the transistor.

For these reasons, in schemes 4 and 5 was provided instead of the electric resistances RA, R, RC and RD external dividing bridge circuit R-RN, which represents the Oh another preferred technical solution, identifying failures transistors IG.

In accordance with the invention the process of formation of two-phase shock shock can be represented as follows with reference to figure 1. The team received at the control input of the switch And moves it to the electrical conductivity. After some time interval of, for example, about 0.5 MS, the team goes to the switch D, which, in turn, also becomes conductive. The electric current flowing from the high-voltage capacitor CHT, is established through the body of the patient and the switches a and D in the direction of mass for a controlled period of time of, for example, of the order of 4 MS, which represents the first phase of the shock of impact. After the electric current is interrupted by switches a and D, followed by the second phase, since the switch means in a conductive state by a corresponding command received at its control input. By analogy with the first phase of the switch is driven with a certain delay with respect to the switch Century. Ie, for example, through a time of about 0.5 MS after translation into the state of conduction of the switch, there is a request to transfer into the state of conduction of the switch which becomes conductive. When this electricity is the current cue, coming from the condenser SNT is set back through the patient's body by means of switches b and C in the direction of the mass during the controlled period of time of, for example, of the order of 4 MS, which represents the second phase of the biphasic shock of the blow.

All types of commands and modulation commands for switches D and With the possibility of full and continuous conduction until the command to truncate change the form factor, which allows to measure the applied energy in accordance with pre-defined by law, or pulse modulation, or any other form of modulation.

A preferred method of implementing this process is to ensure stutter or separation of the two phases at a certain frequency, which is higher than the frequency of the mentioned sequential phases, i.e. on the frequency component, for example 5 kHz. While the process remains the same as the process described in the preceding manner, except that the commands for translation into the state of conduction of the switches D (first phase) and a switch (second phase) are not continuous, i.e. not applied throughout these phases, for example, at a high level, continuously, as in the above example, but are intermittent or fractional signal and the even signal, modulated in the range is the area between the high level and 0 volts. This way of functioning that is similar to the previous one, but more common, is illustrated in figure 3, which shows the timing diagram of control signals for the four switches:

the time T1 corresponds to the translation into the state of conduction of switch A;

the time T2 corresponds to a translation into a state of conduction of switch D pulsed manner;

the time T3 corresponds to the end state of conduction of switch D;

the time T4 corresponds to the end state of conduction of switch A;

- the point in time T5 corresponds to the translation into the state of conduction of the switch;

- the point in time T6 corresponds to the translation into the state of conduction of the switch With a pulsed manner;

- the point in time T7 corresponds to the end state of conduction of the switch;

- the point in time T8 corresponds to the end state of conduction of switch C.

As you can see from the behavior of the curves (6), obtained on the basis of control signals similar to the signals described above for figure 3 provided so shock to the patient is an intermittent or fractional two-phase pulse.

If a command for transfer into the state of conduction of the switches C and D were not interrupted, and was continuous, the obtained two-phase is nulls will contain a positive phase and a negative phase with a gradual decrease in amplitude, which corresponds to the classical two-phase pulse with exponential truncation and with a gradual decrease of the amplitude for each phase.

This switching method using a translation into a state of conductivity in two stages at the time of switching devices, such as transistors with an insulated control electrode type IG (2) for each of the two phases, ensures excellent reliability.

The transistor used for switching, operates mainly in two States, i.e. either in the open state or the closed state. The transition from the open state to the closed state is carried out by electronic transition, which usually should be as short as possible to avoid damage to the transistor.

Indeed, in the open state, no current (except for leakage current) does not pass through the transistor, but the voltage on the terminals (point Z and X for the transistor And or points Z and Y for the transistor) is maximum. In the closed state, the current which passes through the transistor is maximum, but the voltage at its terminals is close to zero. When this power and, accordingly, the energy dissipated by the transistor is relatively small as in the open state and the closed state.

Throughout the property the military phase switching (transition from open state to closed state, or Vice versa, the transistor passes through some intermediate period during which the current is gradually increased from zero to a maximum value, while the voltage goes from its maximum value to practically zero. In other words, the transistor passes through the phase when power and, accordingly, the dissipated energy can be substantial. If the intermediate phase lasts too long, the transistor may be destroyed due to excessive heat.

To ensure proper functioning and optimum reliability and durability of the transistor, it is necessary to limit the power of and, respectively, the energy dissipated by this transistor.

This limitation of power dissipation can be achieved in various ways.

The first of these methods is to minimize the duration of the above-mentioned intermediate phase. The second method consists in switching transistor in the absence of electric current. In the latter case, the duration of the switching no longer is a critical parameter.

The use of galvanically isolated commands to control the transistors a and b, to the extent that it should be simple enough to minimize the number of components and reduce the value of the electric consumption of the circuit, usually does not allow for fast switching transistors And or Century

Circuit transistors a or b before passing through the electric current which circulates in them only when the circuit transistors D or eliminates hazardous energy dissipation in the transistors a and b and to ensure their reliable operation.

This switching method and location allows, on the other hand, do not isolate mandatory for high voltage control electrode of transistors C and D type IG. These transistors are controlled in relation to the weight that allows you to easily switch them or continuously to provide two phases, which is a classic continuous truncated exponential curves, as in the first variant implementation of the invention, or in two phases, streaked in accordance with some law of termination, form factor or arbitrary modulation pulse, as in the second variant implementation of the invention, or according to any other form of modulation.

The control transistors C and D with respect to the weight also allows the use of relatively simple control circuit for fast switching, involving minimal energy loss and excellent reliability for transistors, the cat is who commute strong currents, unlike transistors a and B.

This type of scheme defibrillation using transistor type IG ensures patient safety.

Indeed, in the event of failure of one of the transistors of the type IG electric current may reach the patient's body before applying the shock of the blow. This electric current can be dangerous.

The existing state of the art provide reasonable security with respect to the patient in the case when using a circuit with semiconductor devices for forming the defibrillation shock through the body of a patient is disclosed, for example, in patent US 5824017. This patent discloses the use of a bridge electric circuit H-shaped semiconductor devices. The patient is separated from the bridge electric circuit H-shaped form using Electromechanical relay with two contacts. The relay contacts are always open condition and closed only at the exact moment when the shock must be made. Thus, there is a certain guarantee, according to which there is no danger for the patient outside when directly applied shock.

However, since such Electromechanical relays is relatively bulky and consumes a significant current, the representative tried to develop a reliable safety devices, designed to be able to exclude the use of electromagnetic relays, which are less reliable than the proposed solution.

Thus, specific preferred safety devices provided within this invention are the following devices.

The device comprises a fifth transistor type IG marked position E and is connected in series between a high voltage capacitor CHT and the bridge circuit N-shaped (see figure 4). The fifth transistor E type IG is continuously open until served mentioned shock, and is closed only during this electrical pulse. Thus, bridge electric circuit H-shape is completely cut off from the capacitor before the implementation of the shock of impact, thus preventing any risk of an electric current passing through the body of the patient, before and after the implementation of the mentioned shock of impact. Transistor E type IG is also equipped with a parallel electric resistance RS of a sufficiently large value (e.g., 40 MW), included between the collector and emitter to skip the small talk, providing the ability to verify the normal operation of this bridge elec the historical scheme H-shaped.

This fifth transistor E type IG also controlled using the circuit that supplies the control electrode of the transistor E through the circuit with galvanic isolation, and this circuit is powered using a floating power, as can be seen in figure 4.

To provide the possibility of continuous monitoring of the fact that the transistor type IG bridge electric circuit H-shaped forms are in satisfactory condition before applying the shock of impact, and to identify any failure of one of these transistors, for example, a short circuit, in accordance with the proposed invention provides a safety circuit, which provides a measure at any given time electric voltage at the point Z between the transistor E type IG and the bridge circuit H-shaped. Voltage must have a value in strictly defined limits. The magnitude of the voltage depends on the magnitude of the electrical resistances of the branches mentioned bridge circuit in a non-conductive state and is measured by dividing the bridge circuit, represented by the resistance R and RN in the right part of figure 5, defining between them measuring the output indicated by the position RL. The magnitude of the electric voltage also depends on the values of the electric with the privilege of RA, R, RC and RD in the case when these resistances have values selected to be relatively high (e.g., 40 MW), and are connected in parallel at each of the five transistors type IG. If for any reason one of the transistors of the type IG is in a state of short circuit due to the fact that it should be closed, this voltage will be reduced in a consistent manner that will be detected by this system will provide off this unit and will prevent its further use, to avoid any danger for the patient.

Another way, which can be used alternatively, or additionally, is (if we consider the example implementation presented in figure 2) in dimension and constant control, beyond the implementation period of the shock of impact, the potential difference between points X and Y diagonal electric bridge circuit H-shaped. Usually this potential difference is almost zero due to the symmetry of the scheme and the possible presence of the same electrical resistance of large magnitude, connected in parallel to the transistor type IG. If, on the contrary, one of these transistors IG suddenly appears, for example, a closed short-mentioned bridge circuit will be substantially out of balance, that Bud is t be expressed in a significant difference in electrical voltage between points X and Y. This measurement can be done either by differential measurement between points X and Y, or by introducing between the electrical resistances RC and RD large magnitude (e.g., 40 MW) and a lot of additional electrical resistance substantially smaller size (e.g., 10 kω) and create two voltage dividers, the outputs of which in relation to the mass will testify, in the case when a significant voltage, failure of one of the transistors of the type IG.

The implementation method is preferred in terms of transistor type IG, which must be isolated from the masses (A, b and E), because their management is carried out by mounting with galvanic isolation ISG through a variety of means, for example, optoelectronic means with photovoltaic and photovoltaic connector, with high-frequency transformer, a controllable high frequency pulses, or using any other suitable in this case and provides isolation mounting. Each of these is represented by a rectangle labeled ISG.

Another option is the implementation of the scheme is illustrated in figure 5. It is an additional branch of reducing electrical noise and disturbances from the high-voltage charge of the capacitor CHT. This ve is V passes from the point Z to the masses. It contains the diode DP, the resistance RP and the transistor F with an insulated control electrode, for example, transistor type IG, which is made conductive in the process of charging the high voltage capacitor CHT. Bridge circuit of the voltage divider formed by electric resistance RS and this branch is associated with a mass, allows, thanks to the resistance value RP (for example, 5 kω) to significantly reduce the amplitude of the electrical noise at the point Z, arising from the charge of the capacitor CHT through the voltage multiplier. Interference coming on the pavement wiring diagram H-shaped form, are, therefore, quite small.

Branch RP + DP also performs an additional function. It allows, for security reasons, to ensure the discharge of high voltage capacitor CHT, while making conductive the transistors E and F.

The function of the diode DP is to maintain the line Z at low, but not zero, the level of electric potential to reduce the leakage currents in the transistors of the type IG, while ensuring the proper functioning of the amplifier EDM and measurement of the impedance of the patient's body, as shown in figure 5 rectangle [mli.G + msur Z].

This allows smaller values for possible leaks in the direction of the patient's body.

Cardenas defibrillator for the treatment of the patient in the case of stopping his cardiovascular activity due to ventricular fibrillation or ventricular tachycardia by at least one biphasic defibrillation shock, provide electrical defibrillation pulse forming biphasic wave with at least one first phase and a second phase opposite polarities, while the defibrillator includes a high voltage capacitor discharge current which is designed to generate the shock of impact, resulting from the discharge of high voltage capacitor from the top point Z of the bridge circuit, and pavement H-shaped electric circuit containing the four switches A, B, C, D, ensuring the application of shock impact to external to the device load across the street H-shaped electric circuit, each of the two switches A and B is connected with one side to the high voltage capacitor at the upper point Z of the bridge circuit, and on the other hand to point X and Y diagonal of the bridge circuit, respectively, intended for connection to a load external to the apparatus, and each of the other two switches C and D is connected on one side to point X and Y, respectively, intended for connection to an external load, and on the other hand is attached to a point W of the ground, having an electric potential lower than the potential of the upper point Z, and a pair of switches, A+D and B+C are used respectively for forming the first and second the basics of each electrical pulse defibrillation, characterized in that it contains a control circuit that provides control for each phase one of the switches A or B in such a way as to ensure its individual enable for the corresponding phase of the biphasic waveform, and a control circuit that provides control switches C and D and the switch switches from the original open state to a closed state during each of the successive phases of the biphasic wave only after closure of the corresponding switch A or B, the control circuit providing the control switches A and B, which are connected to the high voltage capacitor and is made with the possibility of the closed state during the entire duration of the first and second phases, and a control circuit providing control the second switch of each pair of switches, i.e. switch D for the first phase and a switch for the second phase, the switches C and D are made with the possibility of the closed state during the entire duration of the first and second phases, the second switch is designed for serial link with the load, which is external to this apparatus, after he is open for a specified period of time at the beginning of the phase, and means in the closed state with respect to the accuracy of the e W ground for sequential circuit and open circuit throughout the remainder of this same phase for the occurrence of intermittent or fractional electric current through an external load.

2. A heart defibrillator according to claim 1, characterized in that the two successive phases with opposite polarities are intermittent or fractional frequency higher than the repetition rate of successive phases.

3. The defibrillator according to claim 1, characterized in that the switches D and C are controlled by the first and second phases using intermittent or fractional signal, during which the switches A and B, respectively, are closed for the respective phases, which ensures the generation of a pulse defibrillation intermittent or fractional type formed for each phase of the sequence of pulses separated by pauses and having an arbitrary shape factor or arbitrary modulation pulse.

4. The defibrillator according to claim 1, characterized in that the fifth safety switch E is included in the communication line, passing from the high-voltage capacitor CHT, to interrupt the electrical voltage applied to the pavement H-shaped wiring diagram before and after the shock of the blow.

5. The defibrillator according to claim 1, characterized in that the five switches are transistors type IGBT (integrated gate bipolar transistor insulated gate), each of these transistors has an electric resistance of large magnitude, respectively included between its collector and the th emitter.

6. The defibrillator according to claim 4, characterized in that it contains a means of measuring or checking electrical voltage at the fifth level of safety switch E at the upper point Z, which is the upper point of the bridge H-shaped electric circuit, charging the capacitor and before applying the shock of impact to determine, is not reduced if this voltage is below a specific value that will be considered as the possible presence of a defective component among the switches of the bridge H-shaped electric circuit.

7. The defibrillator according to claim 1, characterized in that it contains a detection means for detecting a possible lowering of the voltage at the upper point Z by measuring the voltage using a separating bridge circuit, i.e. the voltage between the two connected in series electrical resistances, which kasemset upper point Z.

8. The defibrillator according to any one of claims 1 or 2, characterized in that each of the three switches a, b and E, connected to the high voltage source, operated on an isolated gate electrode through the circuit with galvanic isolation.

9. The defibrillator of claim 8, wherein the control circuit with galvanic isolation is a system with an optical connector that provides electrical is th isolation.

10. The defibrillator of claim 8, wherein the control circuit with galvanic isolation is a system with high-frequency transformer providing electrical isolation.

11. The defibrillator according to claim 1, characterized in that it contains between the top point Z and point W grounding branch that contains a diode connected in series, a resistor and a transistor with an insulated control electrode, for example, a transistor-type IGBT, which goes into the conducting state of the charging process of the capacitor, and the bridge circuit of the voltage divider with the help of this branch between the top point Z and point W ground allows, thanks to the value of electric resistance at the terminals of the switch S and resistor, to significantly reduce the amplitude of the electrical noise at the upper point Z arising from the charge voltage of the capacitor through the voltage multiplier, and the specified the branch allows for the translation of the switches E and F (transistors) in the conducting state to provide a capacitor discharge.

12. The defibrillator according to claim 11, characterized in that it contains a diode to maintain a relatively low electric potential at the upper point Z.

13. The method of operation of the defibrillator, in particular defibrillator, as claimed in claims 1 to 12, comprising generating a biphasic defibrillation wave, is holding two phases of opposite polarities, through high-voltage capacitor and bridge H-shaped electric circuit containing four switch high voltage a, b, C, D one in each of the vertical branches, characterized in that control each phase of the biphasic defibrillation wave in two stages at the time, which is transferred to a conductive state of one of the switches within a given phase for each pair of switches A-D and b-C, while the other switch of the pair, which is placed in series in the circuit, including the load, which is external to this unit, after completing delay time to manage them on demand for any of the considered phase, the other switch is performed by the control circuit in accordance with a specified aspect ratio.



 

Same patents:

FIELD: medical engineering.

SUBSTANCE: device has means for producing defibrillation pulse having electric current source, capacitive electric energy storage, high voltage commutator, control unit and control system having patient electrophysical parameter control means and high voltage pulses control means and at least two therapeutic electrodes. The device also has means for compressing human body chest manufactured for instance as elastic cuff having a built-in ultrasonic radiator.

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FIELD: medicine.

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Defibrillator // 2049494

FIELD: medicine.

SUBSTANCE: method involves creating therapeutic circuit fixed on patient body, at least two working therapeutic electrodes, measuring and analyzing patient-dependent electrophysical parameters, charging capacitive storage and its later discharging to the working therapeutic electrodes controlled with control unit. Transmitting defibrillation impulse of given power in discharging is carried out in dosed manner first with the first portion W1 of given power dose with the second portion W2 being accumulated on inductive defibrillation power accumulator and then with the second portion W2 of given power dose. Ratio of the first portion W1 of given power dose to the second portion W2 of given power dose of defibrillation impulse is selected from the range of 0.01 to 150. Defibrillation impulse current intensity is selected only when emitting the first portion W1 of given power dose. Cardiodefibrillation impulse is built as bipolar Gurvich impulse. The given power quantity usable for charging the capacitive defibrillator storage is selected to be equal to a value from the range of 4-500 J, defibrillation impulse current intensity being selected from the range of 0.005 to 175 A and voltage equal to a value from 3 to 30000 V. Means has power supply source having unit for controlling charge level of the capacitive storage, unit for building defibrillation pulses, switchboards formed by controlled keys, at least two working therapeutic electrodes and diodes bypassing the controlled keys, resistive current transducer, analog-to-digital converter and control unit having required functional communications to the analog-to-digital converter and controlled keys. The resistive current transducer is in current feeding bus having minimum potential relative to measuring unit under operation having analog-to-digital converter in its structure.

EFFECT: enhanced effectiveness of usage; high safety of patient treatment procedure.

7 cl, 9 dwg

FIELD: medical engineering.

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EFFECT: high reliability in delivering defibrillation pulse at given address.

5 cl, 1 dwg

FIELD: medicine.

SUBSTANCE: invention concerns medicine area, namely to area of urgent cardiological resuscitation. The heart defibrillator for treatment of the patient in case of cardiovascular activity termination by means of the shock blow provided with the dosed out diphasic electric discharge of high-voltage condenser through the H-shaped bridge circuitry, contains the high voltage commutator A, B, C or D in each of the branches. According to the invention each of opposite polarity phases of a diphasic shock blow is managed in two stages on time in such a manner that for each pair of the commutators concerning the given phase, the first of pair commutators is changed over in leading state and remains leading during all this phase whereas the second commutator of this pair is shorted with some time delay in relation to the first commutator throughout some operated duration for establishment of a current flow through a body of the patient during this phase, and the second phase is processed in the same way by means of other pair of commutators.

EFFECT: wide use of the defibrillation device.

13 cl, 6 dwg

FIELD: physics.

SUBSTANCE: invention can be used for generating powerful bipolar and multiphase electric pulses. The method involves controlling series-connected single-type power cells containing electrical energy accumulators, and providing switching of positive and negative polarity of the connection of the energy accumulator to leads of the cell, and switching the electrical energy accumulator to leads of the cell, and having bypass diodes which provide flow of current through leads of the cell when electrical energy accumulators are disconnected from the leads of the cell. A signal from a current sensor is transmitted to the analogue input of a digital signal processor (DSP), from the digital outputs of which the power cells are controlled. Before completion of generation of a pulse, the digital signal processor periodically converts the signal from the current sensor, standardises it, calculates deviation from the current value stores in the digital signal processor of the pulse form and compares the deviation with four limiting values. Signals for controlling power cells are output from the outputs of the digital signal processor depending on the comparison results.

EFFECT: simplification of the method of generating pulses and reducing the number of circuit components.

7 dwg, 1 tbl

FIELD: medicine.

SUBSTANCE: group of inventions refers to medical engineering and is designed to restore normal rhythm and contractile function of heart. Automatic external defibrillator includes a pair of electrode plates; a controller connected to the electrode plates through the front-end circuit of ECG and running for analysis of ECG signals to determine whether ECT is recommended, high-voltage circuit connected to the electrode plates for carrying out biphasic defibrillation electric shock when ECT/treatment protocol storage device is recommended, which retains one or more of treatment protocols that include the protocol of single electroshock controlled by AED for carrying out a single biphasic electric defibrillation, followed by a period of cardio-pulmonary resuscitation (CPR); while the controller is connected to the treatment protocol storage device working to implement the protocol of single electric shock where the single electric shock protocol is the default protocol for AED. The second version of defibrillator also contains a battery connected to AED power circuit; user interface control elements the administrator works with to select either a single electric shock protocol, or protocol of repeated electric shocks through the resident piece of software in AED, without removal of battery or linking-up external hardware or software to the AED.

EFFECT: providing opportunities of time management of cardio-pulmonary resuscitation.

14 cl, 10 dwg

FIELD: electricity.

SUBSTANCE: bipolar signal shaping device includes electric energy accumulator, controlled electronic switches switching it and control diagram of the above switches. For shaping of positive and negative polarity signal the electric energy accumulator which is connected to circuit of in-series connected switches is installed. Each of switches is parallel connected to resistor. Control circuit of switches for changing the pulse shape controls the activation of electronic switches and circuit for shaping of bipolar signal. Bipolar signal shaping circuit consists of four switches in-series connected to electric energy accumulator and pulse shape change circuit so that when the first and the fourth switches close, current flows through load in the direction shaping positive polarity signal and when the second and the third switches close, current flows through load in the direction shaping negative polarity signal. Control signals of electronic switches are supplied from control diagram for shaping of bipolar signal.

EFFECT: simplifying and optimising electric circuit.

3 dwg

FIELD: medicine.

SUBSTANCE: invention refers to medical equipment, namely to apparatuses for emergency medical care. The apparatus comprises a piece of clothing, a control unit arranged thereon used to control at least one physiological function of the patient to state an emergency, and a therapeutic device arranged on the piece of clothing and operatively connected to the control unit for treating the patient. The therapeutic device is a respiratory therapeutic device applied to supply oxygen, an oxygen-containing gas mixture and/or at least one drug endotracheally, and comprises a perforating unit to perforate the patient's trachea below the larynx.

EFFECT: use of the invention provides extending the range of apparatuses for emergency medical care.

20 cl, 2 dwg

FIELD: medicine.

SUBSTANCE: invention relates to medical equipment, namely to system for carrying out CPR. Device of providing feedback in carrying out CPR contains sensor of compression, adapted for placement between rescuer's hands and victim's chest, module of control with feedback, connected with compression sensor, and programmed for registration of output data of compression, their analysis, identification of single compression cycles and comparison of single cycles of compression with multitude of evaluation criterions. Matrix of comparison is output on presentation device, and each element of matrix corresponds to comparison of one of single compression cycles with one of multitude of evaluation criteria. Method of feedback presentation includes stages of carrying out compression of victim's chest through sensor of compression, registration, analysis, identification and comparison of output data from compression sensor with multitude of evaluation in form of comparison matrix elements.

EFFECT: invention makes it possible to increase efficiency of improvement of technical methods in carrying out CPR.

19 cl, 6 dwg

FIELD: medicine.

SUBSTANCE: invention relates to medical equipment, in particular, to systems of ECG monitoring, which trace indications of ciliary arrhythmia (CA) in real time. System of ciliary arrhythmia monitoring contains source of electrocardiogram data, extractor of P-wave signs, extractor of interval R-R signs, CA classifier, reacting to P-wave sign and interval R-R sign, which classifies cardiac rhythm as that with CA or without CA, display, reacting to CA classifier for displaying CA classification, and user's input for regulation of balance sensitivity/specificity of identification of rhythm with CA, with user's input additionally containing selection of type of patient population for automatic adjustment of nominal working parameters of identification of rhythm with CA for selected type of patient population.

EFFECT: invention will make it possible to simplify adjustment of nominal working parameters Of CA monitoring system for selected type of patient population.

14 cl, 11 dwg

FIELD: medicine.

SUBSTANCE: invention refers to medical equipment. An external defibrillator for two-phase defibrillation waveform supply comprises a high-voltage circuit, which accommodates a condenser, as well as a pair of electrodes and a number of switches. The high-voltage circuit is presented to charge the condenser to supply the defibrillation pulse. The switches comprise an H-bridge, connected between the condenser and electrodes and can be connected to first and second phases of the two-phase defibrillation waveform to the electrodes. A second-phase tilt is adjustable. The controlled conduction path comprises the H-bridge switch and enables the controlled conduction path for the second phase of the two-phase waveform.

EFFECT: using the invention enables higher safety and effectiveness of defibrillation.

12 cl, 6 dwg

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