摘要:
A defibrillator incorporates an analyser (2) arranged to receive signals from a patient's heart (such as from electrode pads (6) placed on the patient's chest). A charging circuit (4) enables the electrodes (6) to deliver a charge from the charging circuit to the patient. The analyser is arranged to compare one or more heart rhythm sequences from the patient with predetermined data relating to a heart rhythm and, depending on a result of an initial part of comparison, the analyser is arranged to activate starting of charging of the charging circuit, whilst comparison continues, in readiness for possible delivery of a shock to the patient.
摘要:
Methods and systems for defibrillation therapy involve delivering a pre-shock waveform to cause contraction of skeletal musculature in the patient's thorax before delivering a defibrillation waveform. A shock is delivered to the patient's heart during contraction of the skeletal musculature for a reduction in defibrillation threshold. The pre-shock waveform is sufficient in energy to cause one or both of deflation of the patient's lungs and muscle fiber shortening of the skeletal musculature. A delay interval may be initiated relative to delivery of the pre-shock waveform, wherein the defibrillation waveform is delivered following expiration of the delay interval. Motion of the patient's thorax and/or expiration of the patient's lungs may be detected, responsive to the pre-shock waveform. The defibrillation waveform may be delivered in coordination with the detected parameter, such as in relation to detection of a peak in the thoracic motion or minimum in transthoracic impedance.
摘要:
An external defibrillator for delivering a defibrillation waveform to a patient. The defibrillator includes chest electrodes for detecting at least one ECG signal on the patient and for delivering the defibrillation waveform to the patient, a defibrillation circuit for shaping and delivering the defibrillation waveform, a pulse sensor for detecting the presence of a cardiac pulse in the patient, wherein the pulse sensor has a pulse signal as its output, and memory and processing circuits for analyzing the pulse signal in conjunction with the ECG signal to determine whether the patient has a pulse.
摘要:
Miniature defibrillators and cardioverters detect abnormal heart rhythms and automatically apply electrical therapy to restore normal heart function. Critical to this function, aluminum-electrolytic capacitors store and deliver life-saving bursts of electric charge to the heart. This type of capacitor requires regular nullreformnull to preserve its charging efficiency over time. Because reform expends valuable battery energy, manufacturers developed wet-tantalum capacitors, which are generally understood not to require reform. Yet, the present inventors discovered through extensive study that wet-tantalum capacitors exhibit progressively worse charging efficiency over time. Accordingly, to address this problem, the inventors devised unique reform techniques for wet-tantalum capacitors. One exemplary technique entails charging wet-tantalum capacitors to a voltage equal to about 90% of their rated voltage and allowing the charge to dissipate through system leakage for a period of time, before discharging through a non-therapeutic load.
摘要:
A plurality of electrodes are adapted to be attached on a living body. An electric pulse is output through the electrodes as an electric stimulation to the living body. An analyzer is operable to detect a waveform of the electric pulse and to analyze a parameter of the waveform. A display displays the parameter together with one of the waveform and a model waveform which is an invariable waveform representative of the electric pulse.
摘要:
Devices, methods, and software implementing those methods for providing communicating external chest compression (ECC) devices and defibrillation (DF) devices, where the ECC and DF devices can be physically separate from each other. Both ECC and DF devices are able to operate autonomously, yet able to communicate with and cooperate with another device when present. Some ECC and DF devices are adapted to be physically and/or electrically coupled to each other. One ECC device includes a backboard, a chest compression member, a communication module, controller, and at least one sensor, electrode lead or electrode. One DF device includes a defibrillator module, a controller, and a communication module that can communicate with the ECC communication module. The communicating ECC and DF devices may deliver ECC, pacing, defibrillation, ventilation, and cooling therapies, and may deliver instructions to human assistants, in a coordinated and cooperative fashion.
摘要:
An apparatus configured to provide a defibrillation shock or pacing stimuli to a patient and methods for controlling the apparatus are provided. The method includes obtaining and analyzing physical parameters of the patient to determine whether the patient has a heart condition appropriately treated with a defibrillation shock or pacing stimuli, if the appropriate treatment is pacing stimuli, automatically determining a magnitude of the pacing stimuli and supplying the pacing stimuli to the patient at the magnitude and at a pacing rate.
摘要:
A dosage for electrotherapy delivered to a patient, such as a defibrillation pulse delivered by an external defibrillator, is selected based on an age-related classification, such as adult or child, and a measured electrical parameter, such as the transthoracic impedance, of the patient. For example, a nominal voltage level for an energy storage circuit may be determined based on a nominal dosage. The nominal voltage level may be adjusted by applying a function that relates voltage level adjustment to impedance to the measured impedance. The function may be selected based on the age-related classification of the patient. The dosage of the defibrillation pulse delivered based on the adjusted voltage level, i.e., the selected dosage, may have a substantially equivalent probability of success for the patient as the nominal dosage would provide for a reference patient with an average transthoracic impedance for the class of which the patient is a member.
摘要:
A device and method are presented for prolonging the atrial effective refractory period with pacing therapy. Such refractory period prolongation renders the atrial tissue less susceptible to the onset of atrial fibrillation. A particularly useful application is during the period after application of electrical therapy to the atria.to terminate an episode of atrial fibrillation.
摘要:
A defibrillation circuit generates a defibrillation pulse and includes a patient-parameter compensator that causes the pulse to have a predetermined characteristic regardless of the value of a patient parameter. For example, the circuit can generate defibrillation pulses that have a desired shape, decay rate, voltage level, current level, and/or energy level regardless of the patient impedance. Consequently, a defibrillator that includes the circuit is likely to be more effective than prior defibrillators in restoring normal heart rhythms to patients having an atypical value for a parameter such as impedance.