Defibrillator

 

(57) Abstract:

The invention relates to medicine and can be used in devices for intensive care and electro-therapy, in particular in defibrillators. The technical result is to increase safety due to the blocking of the discharge if the electrical resistance of the patient is outside allowed for defibrillation, as well as improving the efficiency of therapeutic effects due to the formation of the bipolar pulse. For this purpose, in the device containing the source 1 power is connected parallel to the capacitor 2 and the diode 3, the first throttle 5 and the first key 7, and the master oscillator 13, the electrodes 16, 17 to connect the patient entered the second 8, the third 9 and fourth 10 keys, the source 11 of the reference voltage, the circuit 12 matches, the command device 4, the second throttle 6, the resistor 14. If the electrical resistance of the patient is outside permitted for defibrillation or in the event of a malfunction in the circuits of the electrodes from the output of the comparator 15 is supplied prohibiting signal to the command unit 4, the outputs of which do not appear signals enable keys 7, 8, 9, 10, the electrodes 16, 17 does not enter priborakh for resuscitation and electro-therapy, in particular defibrillators.

Also known defibrillator containing the device, generating the control signal by applying the defibrillation pulse, the capacitive storage device charge and device for charging a storage device. The device of the discharge pulse defibrillation connects the storage device in series with the patient to selectively supply trapezoidal pulse to the patient (1).

A disadvantage of the known device is the lack of lock discharge if the electrical resistance of the patient is outside allowed for defibrillation, as well as forming device of the unipolar pulse, reducing the effectiveness of therapeutic treatment.

The closest device to the same destination to the claimed invention by a combination of traits is defibrillator containing the power source, the capacitor, key, throttle, voltage sensor, current sensor, a multiplier, a comparator, an oscillator, a diode electrodes. In him the power of the defibrillation pulse is measured by the multiplier and compared with the specified value in the comparator, which controls the key pulse power control (2).otulana patient is outside, allowed for defibrillation, as well as the formation of these devices unipolar pulse, reducing the effectiveness of therapeutic treatment.

The technical result of the invention is to increase the device's security by creating the possibility of blocking the discharge and increasing the effectiveness of therapeutic effects due to the formation of a unit bipolar pulse defibrillation.

This is achieved by the defibrillator that contains the power source, is connected parallel to the capacitor and the diode, the anode of which is connected to the second output of the power source, the first inductor and the first key, and the master oscillator, the first output of which is connected with the control input of the comparator, the electrodes for connecting the patient entered the second, third, fourth, keys, reference voltage source, schema matching, the command device, a second inductor connected between the first power supply output and the input of the second key, the output of which is connected to the first electrode, and also to the input of the third key, the second comparator input and through a resistor to the first output of the circuit matches the second output of which is connected to the second electrode, and t is outinen with the first output command device control input of the second key, the output of the third key is connected with the second output power source and the output of the fourth key, the input of the first key through the inductor connected to the first output power source and the cathode of the diode, the control inputs of the first and third keys are connected with a second output command device, the first input of which is connected to the first power supply output, the second input to the comparator output and the third input to the second output of the master oscillator, the first output of which is connected with the control input schema matching, the input of which is connected to the output of the voltage reference.

The invention is illustrated by the following drawings:

in Fig. 1 shows a structural diagram of the inventive device;

in Fig. 2 diagram of the oscillator;

in Fig. 3 is a diagram of the comparator;

in Fig. 4 - scheme command device;

in Fig. 5 is a diagram of the coincidence.

The defibrillator contains the source 1 power supply, capacitor 2, diode 3, the command device 4, the first 5 and second 6 chokes, first 7, second 8, the third 9 and fourth 10 keys, the source 11 of the reference voltage, the circuit 12 matches oscillator 13, a resistor 14, a comparator 15, the electrodes 16 and 17. When the capacitor 2 and Technika 1 power the first output of the oscillator 13 is connected with the control input of the comparator 15, the second throttle 6 is included between the first output of the power supply 1 and power input of the second key 8, the output of which is connected to the first electrode 16 and the third input key 9, the first input of the comparator 15 and, through a resistor 14 to the first output of the circuit 12 matches, the second output of the circuit 12 matches is connected to the second electrode 17 and the second input of the comparator 15, the output of the first key 7 and the fourth input key 10, the input of the first key 7 through the first throttle 5 is connected to the first output of the source 1 power to the second output of which is connected to the outputs of the third 9 and fourth 10 keys, control inputs of the second 8 and the fourth 10 keys connected and connected to the first output command device 4, the control inputs of the first 7 and the third 9 keys are interconnected and a second output command device 4, the first input of which is connected to the first output of the power supply 1 power supply, a second input to the output of the comparator 15, and the third input to the second output of the oscillator 13, the first output of which is connected with the control input circuit 12 matches, the second input of which is connected to the output of the source 11 of the reference voltage.

Withania, the electrodes 16, 17 are connected to the patient. At the command of the operator (doctor) master oscillator 13 is supplied command defibrillation. This opens the circuit 12 matches and the output voltage of source 11, through resistor 14 is applied to the electrodes 16, 17 and to the inputs of the comparison of the comparator 15. The resistor 14 and the resistance of the patient form a voltage divider, with the inputs of the comparator 15, the voltage will be less than the specified, if the electrodes are shorted, or if the resistance of the patient is less than the allowed or greater than specified on the comparator, if the electrodes have a break, or resistance of the patient is greater than allowed. In all these cases, from the output of the comparator 15 is supplied prohibiting signal to the command unit 4, the outputs of which do not appear signals enable keys 7, 8, 9, 10, ensuring patient safety in the event of a malfunction in the circuits of the electrodes.

If the resistance of the patient is normal and does not have a short circuit, or open circuit in the circuits of the electrodes, the output of the comparator 15 is missing prohibiting signal, and a command device 4 generates a signal on the first output enable 8 second and fourth 10 keys. When this pulse is applied from the condenser 2 through the orifice 6 and alekou the capacitance of the capacitor 2 and the resistance of the patient. After reduction of the specified voltage to the value specified in the command device 4, the keys 8 and 10 are turned off, and the keys 7 and 9 are included, while the patient is pulse of reverse polarity with the voltage remaining on the capacitor 2.

Thus, the patient is served bipolar pulse, increases therapeutic effect.

To ensure the health of the device as keys 7, 8, 9, 10 can be used thyristors, for example-325-12,5 or power field-effect transistors, for example, MGY25N120D.

The generator 13 can be performed according to the scheme given in Fig. 2. It contains the trigger 18, for example (CTR), the button 19 is connected between the R and S inputs him direct access to the trigger 18 is the first generator output and inverted output of the trigger is connected to the input of one-shot 20 (for example, CRAG) whose output is the second output of the generator.

When the button is clicked by the operator at the outputs 1 and 2 generator sequentially formed a single pulse.

The comparator 15 may be performed according to the scheme given in Fig. 3. The comparator contains the thyristor 21 (for example,-325-12.5), source 22 to a reference voltage (for example, CREA), the transistor 23 (we CRUD), scheme 26 OR (for example, chip CLB), the diodes 27, 28 (for example, CDV), resistors 29 to 36, while the output of the circuit 26 OR the output of the comparator, the input of the transistor 23 - managing input of the comparator, one of the outputs of the source 22 and the input of the thyristor 21 is respectively the first and second inputs of the comparator.

In the absence of a signal at the control input of the thyristor 21 is closed, the input to the inputs 1 and 2 of the comparator 15 is fed to the amplifiers 24, 25, and therefore the comparator output signal is absent. The choice of the resistors 31, 34 sets the upper threshold level for comparison with the input signal.

When the presence of a signal at the control input of the thyristor 21 is opened and the amplifiers 24, 25 are pulses exceeding the input signal is above the upper threshold level (on the amplifier 24 and the pulse signal of insufficient amplitude of the input signal (power 25), which are combined circuit 26 OR and proceed to the exit. Resistors 35, 36 and diodes 27, 28 performs the function of protecting the input circuit 26 and logical OR load shall not be.

Command device 4 can be performed according to the scheme given in Fig. 4. It contains the schema 37 OR (for example, chip CLE), the output of which is with whom and 39, 40 connected in the circuit of the repeater and comparator, respectively (for example, chip UD) is connected to the input of one-shot 41 (for example, chip CRAG), triggers, 42, 43 (for example, chip KTM), circuit 44 (e.g., chip CLI), resistors 45, 46, 47, 48, capacitors 49, 50, and output circuit 44 are first and second outputs command device 4, the first input command device 4 through the resistor 45 is connected to the input of the key 38, the second input to the input of the trigger 42 and managing logon trigger 43, and the third input to the input circuit 37 OR.

When the presence of a signal on the second input command unit (CU) 4, KU blocked and, regardless of the signals at the inputs 1 and 3, does not generate control signals on outputs 1 and 2. In the absence of a signal on the second input and the presence of a signal on the third input KU, the key 38 is opened and the capacitor 49 is stored voltage coming from the voltage divider formed by resistors 45, 46. Repeater 39 provides storage of charge on the capacitor 49. Divider 47, 48 is the nominal voltage drop of the power source during the pulse defibrillation. The comparator 40 compares the set value with the current value, and then starts od which changes its state after the passage of this pulse on the opposite, opening the circuit 44 And to pass the next pulse of one-shot 41 on output 1. Following the one-shot pulse is generated similarly to the above, the capacitor 49 is charged to a voltage that will be present at the input 1 after the first defibrillation pulse. The key 38 is opened to charge the capacitor 49 to the second input circuit 37 OR. The trigger 42 holds KU from the generation of the signals on outputs 1 and 2 when signals on the second input.

Option circuit 12 matches shown in Fig. 5. It contains the thyristor 51 (for example,-325-12.5), which input is the first input circuit 12, the output of the second output of the circuit 12, and a control input connected to the series-connected resistors 52 and 53, a common point which is the control input circuit 12, and the second output resistor 53 to the first output of the circuit 12.

When the presence of a signal on the control input of the thyristor 51 is opened and passes a signal from input 1 to output 2 of the circuit 12.

Thus, the above data allow us to conclude that the proposed device can be implemented using the steps described in the application of funds. The advantage of it is that the device allows p is the electrical resistance of the patient is outside, allowed for defibrillation, as well as forming device bipolar pulse defibrillation.

Sources of information

1. U.S. patent N 4823796, class a 61 N 1/36, 25.04.89.

2. USSR author's certificate N 1470299, class A 61 N 1/39, 07.04.89.

Defibrillator, containing the power source, is connected parallel to the capacitor and the diode, the anode of which is connected to the second output of the power source, the first inductor and the first key, and the master oscillator, the first output of which is connected with the control input of the comparator, the electrodes for connection to the patient, characterized in that it introduced the second, third, fourth, keys, reference voltage source, schema matching, the command device, a second inductor connected between the first power supply output and the input of the second key, the output of which is connected to the first electrode, and also to the input of the third key, the second comparator input and through a resistor with the first output of the circuit matches the second output of which is connected to the second electrode and to the third input of the comparator, the output of the first key and the fourth input key, the control input of which is connected to the first output command device and control input W the od of the first key through the inductor connected to the first output power source and the cathode of the diode, the control inputs of the first and third keys are connected with a second output command device, the first input of which is connected to the first power supply output, the second input to the comparator output and the third input to the second output of the master oscillator, the first output of which is connected with the control input schema matching, the input of which is connected to the output of the voltage reference.

 

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