Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1996-04-30
1998-05-12
Ledynh, Bot L.
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
174143, 333182, 361330, H01G 435, H01G 438
Patent
active
057515395
ABSTRACT:
An improved ceramic feedthrough capacitor design which results in distinct advantages in EMI (electromagnetic interference) filtering and therapeutic waveform management for implantable defibrillators and pacemakers and the like. The invention provides ceramic capacitor electrode plate designs which provide both low impedance decoupling for EMI suppression, and, at the same time provide an isolated common ground point through a separate coupling capacitor for electrical isolation of the filtered circuit from the metal case (usually titanium) of the defibrillator or the like. Such an arrangement allows the defibrillator HV (high voltage) output pulse to the heart to be referenced lead to lead (including reverse polarity), or from either lead to a common floating ground point or to the titanium case. The primary application of the invention is directed to implantable defibrillators where the output pulse to the heart is typically high voltage (up to 750 volts) and of short duration (typically in the 10.times.10.sup.-3 seconds or 10 millisecond range). The invention is equally applicable to implantable pacemakers. The invention is particularly suited for a combination defibrillator (tachycardia) and pacemaker (bradycardia) unit where there are sense (heart monitoring), low voltage (pacing) and high voltage (defibrillator) output leads.
REFERENCES:
patent: 3235939 (1966-02-01), Rodriguez et al.
patent: 3538464 (1970-11-01), Walsh
patent: 4144509 (1979-03-01), Boutros
patent: 4148003 (1979-04-01), Colburn et al.
patent: 4152540 (1979-05-01), Duncan et al.
patent: 4424551 (1984-01-01), Stevenson et al.
patent: 5333095 (1994-07-01), Stevenson et al.
Ni Dick H.
Stevenson Robert A.
Ledynh Bot L.
Maxwell Laboratories Inc.
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