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 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, the first comparator 15, the electrodes 16 and 17, the second comparator 18. In the recruitment process energy takes into account the state of the comparator 18: if the resistance of the patient's body is in the zone of minimum values for defibrillation, the signal comparator 18 switches the source 1 power mode set low energies, which is equivalent to the restriction of the defibrillation signal to permissible limits. This allows to expand possibilities of use of the device for patients with the impedance of the body, close to the boundary values due to limitations of defibrillation energy to values safe for the patient. 3 Il.

The invention relates to medicine and can be used in devices for intensive care and electro terpisahkan supply control pulse defibrillation, 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 (see U.S. patent 4823796, class A 61 N 1/36, publ. 25.04.89).

A disadvantage of the known device is no blockage or restriction of the current defibrillation if the electrical resistance of the patient is outside allowed for defibrillation, as well as the formation of these devices 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 a defibrillator that contains the power source, a capacitor and a diode, two chokes, four key oscillator, voltage reference, the schema matching, the command device and the comparator (see RF patent 2153901, class A 61 N 1/39 declared 08.02.99, publ. 10.08.2000). It is blocking the issuance of bipolar pulse in the case of non-resistance of the patient's body to the value permitted for defibrillation.

Lack of project, if the electrical resistance of the patient close to the allowed values for defibrillation. This deficiency reduces the ability of emergency care for patients with low body resistance to passage of current defibrillation.

To eliminate the disadvantages of analogue and prototype in the defibrillator, containing a power source connected in parallel to its output capacitor and the diode, and the first power supply output is connected to the cathode of the diode, and the second anode, the first and second inductors, the first, second, third and fourth keys, a source of reference voltage, a command device, oscillator, schema matching and the first comparator, the electrodes for connection to the patient, and the inputs of the first and second keys are connected, respectively, through the first and second inductors to the first power supply output, the output of the second key is connected to the input of the third key, the first electrode, the first input of the first comparator through a resistor to the first output of the circuit matches the input of which is connected to the output of the reference voltage, the second output to the output of the first key input of the fourth key, the second input of the first comparator and the second electrode, the control inputs of the which is connected to the control inputs of the first and third keys, the outputs of the third and fourth keys are connected to the second power supply output, the first output of the master oscillator is connected to control inputs of schema matching and the first comparator, the first input command device is connected to the first power supply output, the second input with the second output of the master oscillator, and a third input from the output of the first comparator input a second comparator, a control input connected to the first output of the master oscillator, the first input with the first electrode for connection to the patient, the second input to the second electrode, and the output connected to the control input of the power supply.

The invention is illustrated by the following drawings:

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

in Fig.2 - scheme of the comparator;

Fig 3 - schematic diagram of the controlled power source.

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, the first comparator 15, the electrodes 16 and 17, the second comparator 18. When the capacitor 2 and the diode 3 to the power the first output of the oscillator 13 is connected to control inputs of the circuit 12 matches, Comparators 15 and 18, 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 inputs of the Comparators 15 and 18 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 to the second inputs of the Comparators 15 and 18, the output of the first key 7 and the fourth input key 10, the input of the first key 7 via the inductor 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 and the anode of the diode, 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 second output of the oscillator 13, and a third input to the output of the comparator 15. The first output of the comparator 15 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, and the output of comparator 18 is connected to the control input of the source 1 power.

In the recruitment process energy takes into account the state of the comparator 18: if the patient impedance is in the area of allowed values for defibrillation, the signal from the comparator 18 to the source 1 power is not supplied, and the capacitor 2 is charged to the power specified by the operator (doctor). If the resistance of the patient's body is in the zone of minimum values for defibrillation, the signal comparator 18 switches the source 1 power mode set low energies, which is equivalent to the restriction of the defibrillation signal to permissible limits. Thus, the defibrillation of the patient, but with the restriction of the energy of the impact, which ensures the safety of the patient with abnormal resistance value.

At the end of the set energy of the oscillator is started for the formation of the issuance of the defibrillation pulse. This opens the circuit 12 matches, and the output voltage at the inputs of the comparator 15, the voltage will be lower than the specified if the electrodes are shorted, or the resistance of the patient is less than allowed for defibrillation. If the electrodes have a break, or resistance of the patient is greater than allowed for defibrillation, the voltage at the inputs of the comparator 15 is longer than the specified time. 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 7-10, than protecting the patient from feeding him energy in the zone of resistance, is not allowed for defibrillation.

To ensure the health of the device as keys 7-10 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 the description of the patent of the Russian Federation 2153901 in Fig.2.

The comparator 15 may be performed according to the scheme shown there in Fig. 3.

Command device 4 can be performed according to the scheme shown there in Fig.4.

A variant of the scheme of 12 matches in the same Fig.5.

The comparator 18 can be performed according to the scheme given in Fig.2 of this application. It contains the thyristor 19 (for example,-325-s, operational amplifier 22 (for example, series CRUD), resistors 23 to 26, while the output of the operational amplifier 22 is the output of the comparator.

In the absence of a signal at the control input of the thyristor 19 is closed, so that the signal at the output of the comparator is missing. When the presence of a signal at the control input of the thyristor 19 is opened, the operational amplifier 22 switches the comparator and, in case, if the input 2 signal below reference (from the resistors 24, 26), at its output, and hence on the output of the comparator 18, is formed in the low voltage level.

Managed source 1 power supply can be performed according to the scheme given in Fig.3. The source contains a battery 27 (for example, GC-2 or 10RSH2), power transistor 28 (for example, CTA), resistors 29, 30, 31, an oscillator 32, a voltage controlled (for example, chip KRG), the keyboard 33 job energies (for example, buttons P2K or PCI), the step-up transformer 34, the rectifier diodes 35, 36 (for example, CDG), the capacitor 37.

In the absence of a signal at the control input of the source voltage from the keyboard 33 starts the generator 32 to the moment when this voltage will be equal to the voltage on the capacitor 37. Thus, the source 1 a is ptx2">

When the presence of a signal on the control input source 1 this signal blocks the input of the generator 32 from the keyboard 33, and outputs 1, 2 source of a signal that is proportional not specified from the keyboard 33, and a signal proportional to the signal at the control input.

Thus, the information presented 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 to increase the safety of the device while maintaining the lock mode of the discharge, when the patient impedance is outside of the values allowed for defibrillation, in expanding the possibilities for use of the device for patients with the impedance of the body, close to the boundary values due to limitations of defibrillation energy to values safe for the patient.

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

 

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