EP0299338A2
Expired / Lapsed
EP
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Defibrillator
Assignee: Nihon Kohden Corp
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Filing: 1988-07-05
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Granted: —
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Expires: 2008-07-05
Abstract
Abstract A defibrillator for applying a high voltage, with which a high-voltage capacitor circuit (2) is charged through electrodes (4) to a body of a patient. The high-voltage capacitor circuit (2) comprises metallized plastic film capacitors. A charge abnormality detecting circuit (5) is provided for detecting a dielectric breakdown of the capacitor circuit (2). A notifier (6) indicates any abnormality in response to a detection signal of the detecting circuit (5). A switch circuit (1a) inhibits, in response to the detection signal, further supply of high voltage from a high-voltage generating circuit (1).
Inventors
- 👤 Nobukazu Miyajima
- 👤 Akira Tanaka
- 👤 Masaru Shinoda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 10:26
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/38; A61N1/39; A61N1/3925; A61N1/3937; A61N1/3904; A61N1/3931
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
181 words
A defibrillator comprising: - a high-voltage generating circuit (1, 10, 21) ; - a high-voltage capacitor circuit (2, 11, 22, 40) which is adapted to be charged with a high voltage by the high-voltage generating circuit (1, 10, 21) and which consists of a metallized plastic film capacitor (11, 40); - an output circuit (3, 13, 23) which includes at least a switch (12) and is adapted to apply the high voltage to a paddle (4, 14, 24) to be mounted on a body of a patient; - a charge abnormality detecting circuit (5, 15-17, 25-27) for detecting a sharp increase in charge current and/or a sharp drop in charge voltage which are caused by a dielectric breakdown of the metallized plastic film capacitor (11, 40); - a notifying means (6, 18, 28) for notifying any abnormality in response to a detection signal of the detecting circuit (5, 15-17, 25-27); and - a switch circuit (1a, 19, 21a) for inhibiting the further supply of any high voltage from the high-voltage generating circuit (1, 10, 21) in response to the detection signal.
Claim 2
Dependent Claim
181 words
A defibrillator comprising: - a high-voltage generating circuit (1, 10, 21) ; - a high-voltage capacitor circuit (2, 11, 22, 40) which is adapted to be charged with a high voltage by the high-voltage generating circuit (1, 10, 21) and which consists of a metallized plastic film capacitor (11, 40); - an output circuit (3, 13, 23) which includes at least a switch (12) and is adapted to apply the high voltage to a paddle (4, 14, 24) to be mounted on a body of a patient; - a charge abnormality detecting circuit (5, 15-17, 25-27) for detecting a sharp increase in charge current and/or a sharp drop in charge voltage which are caused by a dielectric breakdown of the metallized plastic film capacitor (11, 40); - a notifying means (6, 18, 28) for notifying any abnormality in response to a detection signal of the detecting circuit (5, 15-17, 25-27); and - a switch circuit (1a, 19, 21a) for inhibiting the further supply of any high voltage from the high-voltage generating circuit (1, 10, 21) in response to the detection signal.
Claim 3
Dependent Claim
91 words
The defibrillator according to claim 1, wherein the charge abnormality detecting circuit (15-17) comprises - a voltage divider (15) for the high voltage supplied by the high-voltage capacitor circuit (10), - a peak holding circuit (16) to which a fraction voltage of the voltage divider (15) is input, and - a comparator (17) for comparing the fraction voltage with a predetermined voltage lower than the holding voltage of the peak holding circuit (16) and for generating an alarm and inhibiting signal when the present fraction voltage is below the predetermined voltage.
Claim 4
Dependent Claim
91 words
The defibrillator according to claim 1, wherein the charge abnormality detecting circuit (25-27) comprises - an A/D converter (26) for digitizing a fraction voltage of the high-voltage capacitor circuit (22) , - a memory (27) storing data of curves representing the normal charging and discharging operation of the high-voltage capacitor circuit (22), and - a CPU (25) for continuously comparing the digitized fraction voltage with the stored charging and discharging curves and for generating an alarm and inhibiting signal if the deviation exceeds values of normal operation by a predetermined amount.
Claim 5
Dependent Claim
152 words
The defibrillator according to any of claims 1 to 3, wherein the metallized plastic film capacitor comprises - a plurality of capacitor elements (11a, 41) each of which have metallized plastic films (31a, 31b) wound up and metallic contacts (42) provided on the end surfaces on both sides thereof and which are received in a common case (45), - a pair of capacitor terminals (11b, 47, 47a) which extend from the case (45) and which are connected to metallic contact portions (42) of the capacitor elements (11a, 41) provided on the end surfaces on both sides thereof, and - resistors (11c, 43) each of which have a resistance at least equal to the internal resistance of the respective capacitor elements (11a, 41) per se and which are connected to the metallic contact portions (42) that are provided on the end surfaces on at least one side of the capacitor elements (11a, 41).
Claim 6
Dependent Claim
50 words
The defibrillator according to claim 4, wherein the resistors (11c, 43) are connected each between one (11b, 47) of the pair of capacitor terminals (11b, 47, 47a) and each of the metallic contact portions (42) that are provided on the end surfaces on one side of the capacitor elements (11a,41).
Claim 7
Dependent Claim
35 words
The defibrillator according to claim 4 or 5, wherein the metallic contact portions that are provided on the end surfaces on one side of the capacitor elements are connected in sequence through the resistors (49).
References Cited (Backward Citations)
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