Automatic external defibrillator device

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.

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

5 cl, 1 dwg

 

The invention relates to medicine and can be used for resuscitation and electro-therapy patients.

Known defibrillator [1], containing a power source, a capacitor, a diode, a command device, the first and second inductors, the first, second, third and fourth keys, voltage reference, the schema matching oscillator, a resistor, a first comparator, therapeutic electrodes and the second comparator.

A disadvantage of the known device is the use of the comparator to set energy defibrillation pulse, because the small resistance of the patient's body, close to the boundary value doubles the error definition and, consequently, the patient has a real opportunity to get defibrillation pulse of twice the safe level.

The closest in technical essence and the achieved result is automatic external defibrillator [2], the construction of which was adopted as a prototype. The device prototype contains one storage capacitor having first and second electrodes, a charging circuit connected with the storage capacitor and is used to charge storage capacitor, the flow of energy that is connected with a storage capacitor, having a first output and the WTO the th output and selective electrical connection of the first and second electrodes of the storage capacitor with the first and second output output and a control circuit connected with the charging circuit and the flow of energy and executed, to perform a charge storage capacitor by the charging circuit to the specified level and, when the storage capacitor is charged, the control circuit power transmission for connecting the electrodes of the capacitor with the output pins.

The disadvantage of the prototype is that its design does not provide reproducible matching values selected by the impedance of the patient's body energy defibrillation pulse with energy defibrillating impulse, really affecting the patient's heart, for the weight / size of the continuum of real patients,

The present invention is the elimination of the possibility to make the patient defibrillation pulse beyond the upper limit of allowable values of energy without reducing the effectiveness of the actual kardioreanimatsionnoj procedure.

The technical result of the application of the present invention is the improved targeting of delivery is sent in the body of the patient defibrillation pulse.

This technical result is achieved by the fact that the automatic external defibrillator, containing the means of forming defibrillating pulse consisting of a source of electrical power, capacitive on what epithelia electric energy, high-voltage switch, control unit and control system, including control of electrical characteristics of patients and controls parameters of high-voltage pulses, and at least two of therapeutic electrode further comprises means for compressing the body in the region of his chest, has a built-in source of ultrasonic pulses.

It is advisable that the built-in source of ultrasonic pulses was performed in the form of an ultrasonic emitter.

It is desirable that as the ultrasonic transducer was used magnetostrictive or piezoelectric element.

It is important that the means of the compression body in the area of his chest was made in the form of an elastic cuffs.

Preferably, elastic cuff were provided by the channels for supplying high voltage pulses to therapy electrodes and passing through the interconnect system of control.

The above distinguishing features are necessary and sufficient to achieve the stated technical result. Studied by the author prior art has not been established known technical solutions containing characteristics equivalent to the distinctive characteristics of the present invention, which was a condition of the receipt of the (achievement) declared or similar technical result i.e. the result of the decision of the long-known problems (problems of atrial cardiac muscle) with concomitant achieving particularly good properties of object technology, which gives grounds to assert the compliance of the claimed new technical solutions to the criterion of "inventive step".

The drawing schematically shows a cross-section of the patient's body positioned with automatic external defibrillator.

The list of items

1. The means of forming defibrillating pulse

2. The source of electric power

3. Capacitive energy storage unit

4. High-voltage switch

5. The control unit

6. Control of electrical characteristics of the patient

7. The control parameters of high-voltage pulses

8. The first therapeutic electrode

9. The second therapeutic electrode

10. The body of the patient

11. Elastic cuff

12. Castle elastic cuffs

13. The generator of ultrasonic pulses

14. Ultrasonic emitter

15. Heart

Automatic external defibrillator contains a means of forming defibrillating pulse 1, consisting of a power supply 2, the capacitive energy storage unit 3, the high voltage switch 4, the control unit 5 and the control system, enabling the second means of control of electrical characteristics of the patient 6 and controls the parameters of high-voltage pulses 7, and at least two of therapeutic electrode 8 and 9, mounted on the body of patient 10. In addition, the structure of the device includes means for compressing the body in the region of his chest, for example, made in the form of an elastic cuff 11, is provided with a lock 12. The generator of ultrasonic pulses 13 is electrically connected to a built-in ultrasonic emitter 14, the solid angle of radiation which is directed in the region of the heart 15.

Automatic external defibrillator works as follows.

On the body of patient 10 in the chest with a force of 5-8 kg fix the elastic sleeve 11 by means of the lock elastic cuff 12. Before this operation, pre-on elastic cuff 11 from the side of the body of patient 10 sets the first 8 and second 9 therapeutic electrodes and ultrasonic emitter 14. When turning on the power supply 3 is started forming defibrillating pulse 1. In that case, if the control of electrical characteristics of the patient 6 automatically determines whether effects on heart 15 patient 10 defibrillation pulse, the control unit 5 calculates its parameters. Concurrently, the communication channel "And"made, for example, in the form of acceptance-transmission of the IR port, the control unit sets the mode RA is the notes of the generator of ultrasonic pulses 13, correlated with the parameters of the defibrillation pulse. After charging under the control power supply 5 capacitive energy storage unit 3 (essentially representing a high-voltage capacitor) defibrillation discharge is fed to therapeutic electrodes 8 and 9 due to the closure of the respective conductive channels in high-voltage switch 4. With a short time ahead of the ultrasonic emitter 14 with a generator of ultrasonic pulses 13 serves an ultrasonic pulse that is longer than the duration of 25-30% defibrillatory impulse. Parameters defibrillating pulse during its passage on therapeutic electrodes 8 and 9 is controlled by means of control means 7.

Thus, the possibility is almost aligned in time but spatially distinct impact on fibrillose heart 15 of the patient 10 and ultrasonic current (defibrillation) pulses allows considerably to reduce the energy of the latter at the expense of targeting the delivery of the latter to fibrillose cardiac muscle.

SOURCES of INFORMATION

1. RF patent № 2196616 from 23.07.2001,, MPK7A61N 1/39, "Defibrillator", the authors Vereshchagin A.M. and others

2. RF application No. 2001112772, publ. 20.02.2003,, MPK7A61N 1/39, "Device for holding the outer pacing and biphasic defibrillation",the authors Barsova L.A. and other

1. Automatic external defibrillator, characterized in that it contains at least two therapeutic electrode, the control system of the electro-physical characteristics of the patient and settings defibrillating pulse and means for compressing the patient's body, configured to secure it in the chest and has a built-in source of ultrasonic pulses.

2. Automatic external defibrillator according to claim 1, characterized in that the built-in source of ultrasonic pulses is made in the form of an ultrasonic emitter.

3. Automatic external defibrillator according to claim 2, characterized in that as an ultrasonic transducer using magnetostrictive or piezoelectric element.

4. Automatic external defibrillator according to claim 1, characterized in that the means of compression of the patient's body in the area of his chest made in the form of an elastic cuffs.

5. Automatic external defibrillator according to claim 4, characterized in that the elastic cuff provides channels for supplying high voltage pulses to therapy electrodes and passing through the interconnection of control systems.



 

Same patents:

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.

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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.

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