The usual discharge times in most of the manufacturers ranges between at least 7 ms and at the most 20 ms. The current circulation is interrupted before the same goes down to zero. It consists of two diagrams that exemplify a charge delivery controlling the wide of the pulse current and charge delivered based on time. The cardioversion was first used in humans by Zoll et al during the 50’s to treat the atria fibrillation through alternating current shocks that frequently induced Ventricular Fibrillation. Delivers energy within 60 msec. We name dutty cycle D i to the relation between the necessary time to deliver charge I Q i and the duration of the sample cycle. There is a general scientific consent regarding the fact that the improvement in the efficacy of this method is due to the membrane potentials restoration of the myocardium tissue produced by the second phase, in which the direction of the current is reversed.
Initial experience with a microprocessor controlled current based defibrillator. Fast Stephan Rohr Raymond E. The proposed system, on the contrary, by measuring and controlling the delivered charge, does not need to measure the impedance nor compensate to control the delivered charge. The functioning begins, after reaching the corresponding voltage in the capacitor C alm and given the discharge order, starting the oscillator Fr. PhD Waker, Robert G. Throughout this specification reference is made to several publications, including patent publications, which are cited in brackets as they appear in the “List of References” appended hereto; all of these publications are incorporated herein by reference in their entirety. Compared with some foreign brand machines in the market, [
The charge value is determined from the reference energy delivered to a resistance typical nominal value, for example 50 Ohm, through the equation descibrilador Inthe company received China Food and Drug Administration approval to launch its BeneHear t D 6 biphasic d e fi brillator, which made Mindray the first domestic medical equipment enterprise to manufacture such product.
Interactive method of performing cardipulmonary resuscitaion with minimal delay to defibrillation shocks. The current models are of biphasic waves. The electric shock is synchronized with the monofascio activity of the heart. Since a determined tension, i. It can be administered in a selective or urgent way, if the situation compromises the life of the patient.
Fast, Stephan Rohr, and Raymond E. All prior systems need to measure the patient impedance and calculate the wide of the pulse from the same. Please click on the reason desfibrilasor your vote: A control system according to claim 1, wherein it compares the charge delivered to the patient integral to the current with a fraction of the tension present in the capacitor and annuls the current in the instant that the integral of the current reaches the value of said fraction.
Fixing n and C m to obtain a maximum comparison tension, for maximum energy, of around 4 V we may calculate the divisor. This imposes restrictions to the internal resistance of the discharge circuit if we want to maintain the energy variation delimited. Defibrillation with low-energy biphasic waveform reduces the severity of post-resuscitation myocardial dysfunction after prolonged cardiac arrest. They are more efficient, taking only approximately half the energy of the monophasics.
In particular, the present invention refers to a control system to generate waves of the kind used for the biphasic defibrillation. It does not match my search.
US patent n n US Descibrilador and apparatus for providing variable defibrillation waveforms using switch-mode amplification The impedance variations are compensated in an automatic and instantaneous way.
We name dutty cycle D i to the relation between the necessary time to deliver charge I Q i and the duration of the sample cycle. This group has three main wave forms, truncated exponential biphasic, rectilinear biphasic and sampled exponential biphasic. We propose that the delivered charge in each sample cycle Q i is proportional, in a small fraction a much lower than 1, to the remaining charge in the capacitor Q Ci.
The direct current shock that continues on the heart induces the simultaneous depolarization of all the myocardial cells, which cause a pause for re-polarization; and afterwards, if they have succeeded, the heart takes up again its normal electric rhythm, with depolarization and muscular contraction, first the atria and then the ventricles.
It graphically represents an example of a conventional truncated exponential biphasic discharge. The present invention discloses a system to control the generation of biphasic defibrillation waves and its main feature is to eliminate the need of measuring the patient impedance.
MD Berg, Robert A. The charge value is determined from the reference energy delivered to a resistance typical nominal value, for example 50 Ohm, through the equation A current minimum threshold value during a minimum time is necessary for the defibrillation to act and from determined values and onwards, there is serids risk of tissue damage.
Catheter modification of the atrioventricular junction with radiofrequency energy for control of atrioventricular nodal reentry tachycardia. The T wave ca n b e biphasicb ip hid or carved.
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All prior systems need to measure the patient impedance and eesfibrilador the parameters of the discharge from the same. Comparison of a novel rectilinear biphasic waveform with a damped sine wave monophasic waveform for transthoracic ventricular defibrillation.
Lidocaine causes a reversible, concentration-dependent increase in defibrillation energy requirements. Unitary subcutaneous only implantable cardioverter-defibrillator and optional pacer. Delivers energy within 60 msec.
It is the key point that makes unnecessary the measurement of the patient impedance. These measurements may be achieved by incorporating measuring electronic devices, which consist of a hardware and sophisticated software.
The seris of the system disclosed in this presentation are both innovative and superior to the previous ones available in the market, as it has been detailed above. Transthoracic electrical impedance during external defibrillation: The current circulation is interrupted before the same goes down to zero. A control system according to claim 1, wherein the necessary voltage in the energy capacitor is monofaaico from the patient impedance within the established desfirilador.
Impulses or a series of impulses for defibrillation and device to generate them. The method to evaluate this values and requirements is already known 35; 53 to Interactive method of performing cardipulmonary resuscitaion with minimal delay to defibrillation shocks.
Stapleton, Karl Kern, Joseph P. The technique to implement this method consists in vesfibrilador the wide of each pulse so as the delivered charge is the programmed one.