Bipolar signal shaping device

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

 

The invention relates to the field of medical equipment, namely, defibrillators, and may find application in medical facilities for intensive care, cardiac surgery, intensive care, emergency departments by ambulance and pre-hospital phases of care.

The defibrillator is designed to treat rhythm disorders of the heart using an electric pulse, and for registering and displaying on the monitor the bioelectric potentials of the heart. The device can be used for resuscitation measures and the planned restoration of the rhythm.

The defibrillator provides:

- formation of a bipolar therapeutically effective pulse minimal adverse effects;

- support for a given pulse shape at different resistances of the body of the patient (weight, volume of the thorax and so on);

- ECG with electrodes for defibrillation, and on a separate channel from the ECG electrodes.

Known design described in U.S. patent 6,097,982 (FIG.8 and FIG.9), which uses a unipolar shaper signal (FIG.8), composed of series-connected power cells with drives of electric energy (polar electric capacitors), managed switches (thyristor) and reverse diodes. To obtain the bipolar signal is Ala output unipolar shaper signal is connected to the bridge switching circuit (FIG.9), in the diagonal which turns on the load. Each arm of the bridge consists of a series of managed switches (IGBT) connected in parallel with resistors to equalize stresses in the open state of the keys.

The disadvantages of this scheme are: the necessity of using a large number of power switches, most of which is used exclusively for switching the polarity, and the need to use chains equalizing the voltage on the key elements of the open arms of the bridge. In addition, the scheme applied discrete powerful high-speed reverse diodes, increasing the cost of the product. High voltage bridge circuit for switching the polarity requires the inclusion in one bridge several series-connected electronic controlled switches, for equalizing voltages which when open shoulder resistors are used, through which flow currents whose value should be much higher leakage currents of electronic keys.

The closest analogue to the claimed invention, the set of essential features for a device of forming a bipolar signal, patent RU No. 2218659 C2, publication date 2003.07.27 containing cells connected in series to signal that includes electric drives is some energy and switching them managed electronic keys. Cell signal is made in the form of individual cells to form a signal of positive polarity and a separate cell for forming a signal of negative polarity. In each of the cells of both polarities in parallel to the findings of the respective cells included bypass e managed switch with inverse diode. When this bypass e managed switch with inverse diode of each cell to generate a signal of positive polarity is connected to the control circuit by the switching of negative polarity with the possibility of its circuit at the negative polarity of the generated signal, and a bypass e managed switch with inverse diode of each cell to generate a signal of negative polarity is connected to the control circuit switching the positive polarity with the possibility of its circuit with the positive polarity of the generated signal. The control circuit forming a signal of positive polarity controls the inclusion of e-managed key of each cell to generate a signal of positive polarity, the control circuit forming a signal of negative polarity controls the inclusion of e-managed key of each cell to generate a signal of negative polarity. The voltage e is ectronic keys control polarity switch does not exceed the voltage on the energy storage cell, and the necessity of balancing stress is absent. Because electronic keys that control the switching of polarity, contain integrated reverse diode, there is no need to use inverse discrete diodes.

Disadvantages closest analogue are not comfortable with the layout of the product dimensions and the significant mass of formation of the bipolar signal.

The task, which is aimed by the invention is the creation of a compact electric circuit device of forming a bipolar signal with a reduced size / weight parameters.

The technical result of the present invention is to simplify the electric circuit: positive and negative phase uses one energy storage unit.

The claimed technical result is achieved in that the device forming the bipolar signal that contains drives of electric power, switching its electronic controlled switches, and circuit control these keys,

- to signal positive and negative polarity is used one energy storage unit,

drive electric energy is connected with a chain of series-connected keys,

each of the serially connected keys included in parallel with the resistor

diagram of the control keys to change the shape of the pulse controls the inclusion of each of the electronic switches and circuit formation of the bipolar signal,

chain formation of the bipolar signal consists of four keys, connected in series with the energy storage unit and circuit changes the pulse shape,

- the closure of the first and fourth keys of the current through the load flows in the direction of forming the signal of positive polarity,

- the closure of the second and third keys, the current through the load flows in the direction of forming the signal of negative polarity,

signals on the management of electronic keys are received from a control circuit for forming a bipolar signal.

The device forming the bipolar signal defibrillator new set of elements and links between them allow for the comparison with the closest analogue to simplify the scheme, providing support for the standard pulse shape when the impedance changes and saving the formation of bipolar therapeutically effective pulse minimum damage.

The essence of the proposed technical solution is illustrated by drawings, where:

figure 1 shows at trojstvo the formation of the bipolar signal;

figure 2 shows the current path during the formation of the signal of positive polarity, when closed, the first and fourth keys switching the drive power;

figure 3 shows the current path during the formation of the signal of negative polarity, when closed the second and third keys switching the drive power.

The device forming the bipolar signal consists of a single drive (1) (1) electrical energy, switching its series-connected electronic controlled switches(2, 3, 4, 5, 6), the control circuit (7) (1, 2) these keys. Each of the electronic controlled switches(2, 3, 4, 5, 6) parallel with resistors(8, 9, 10, 11, 12) respectively. The control circuit (7) electronic keys to change the shape of the pulse controls the inclusion of each of the electronic keys(2, 3, 4, 5, 6) and chain formation of a bipolar signal. The chain formation of the bipolar signal consists of four electronic keys: the first (13) key, the second (14) key, the third (15) of the key, the fourth (16) key, connected in series with the drive (1) electrical energy and circuit changes the pulse shape. Keys (13, 14, 15, 16) connected in parallel with load resistor (17). Signals for controlling each of the electronic switches (13, 14, 15, 16) are received from a control circuit (18) for forming a bipolar signal.

Working at trojstvo as follows.

Drive (1) electric energy is charged to the required voltage, depending on a given energy in joules. After that, the voltage applied to the electronic controlled keys(2, 3, 4, 5, 6) to change the pulse shape. The circuit changes the pulse shape(7, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12) is designed to maintain a given pulse shape and energy in joules in patients with different resistance of the chest. This principle is implemented by changing the resistance in the discharge circuit through the elimination of circuit shunt resistors 8, 9, 10, 11, 12. Then the voltage applied to bipolar bridge, which consists of a first (13), second (14), third (15) and fourth (16) electronic keys. Initially, a positive phase impulse (figure 2): when the first circuit (13) and fourth (16) key current through the load 18 to the patient's body) occurs in the direction of forming the signal of positive polarity. Then the negative phase of the pulse (figure 3) on the load (17): when the second circuit (14) and third (15) of the keys, the current from the second (14) key via a load resistor (17) and the key (15) flows in the direction of forming the signal of negative polarity. The signals on the management of electronic keys are received from a control circuit for forming a bipolar signal 18.

The proposed solution allows the op is to imsirovic wiring diagram for the formation of bipolar therapeutically effective momentum and significantly reduce the overall dimensions and the cost of the product.

Currently, prototypes that have been successfully tested.

The device forming the bipolar signal that contains drives of electric power, switching its electronic controlled switches, and circuit control these keys, characterized in that for forming the positive signal and the negative polarity is used one energy storage unit, which is connected with a chain of series-connected keys, each of which is included in parallel with the resistor, and the circuit control keys to change the shape of the pulse controls the inclusion of each of the electronic switches and circuit formation of the bipolar signal, which consists of four keys, connected in series with the energy storage unit and circuit changes the pulse shape so that when the first and fourth circuit key current through the load flows in the direction of forming the signal of positive polarity, and when the circuit of the second and third keys, the current through the load flows in the direction of forming the signal of negative polarity, and the signals on the management of electronic keys are received from a control circuit for forming a bipolar signal.



 

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