Abstract:
A novel electromagnetic interference (EMI) filter is designed to attenuate one or more specific frequencies in order to provide electromagnetic compatibility of an electronic device while in the presence of an electromagnetic emitter operating at the same or similar frequencies. The EMI filter of the present invention combines an EMI low pass filter with one or more “notch” EMI filters tuned to the specific frequencies of interest. When combined in this fashion, the notch EMI filter can effectively attenuate the electromagnetic field of a powerful low frequency emitter which is outside the effective attenuation frequency range of the low pass filter, which is itself effective at filtering a broad range of higher frequencies. In a preferred embodiment, the notch EMI filter capacitive element is integrated in a co-planar relationship with a ceramic feedthrough filter capacitor assembly. This combined notch and low pass filter arrangement is particularly effective in an implantable medical device such as a cardiac pacemaker or implantable cardioverter defibrillator (ICD) against passage of external interference signals, such as those caused by both digital cellular phones and electronic article surveillance systems operating at low frequencies.
Abstract:
An improved capacitor is provided particularly for use in electromagnetic interference (EMI) filter applications, for example, in an implantable medical device such as a heart pacemaker or defibrillator, to accommodate relatively high pulse currents. The capacitor comprises a plurality of active and ground electrode plates interleaved and embedded within a dielectric casing of ceramic or the like with each active and ground plate being defined by a closely spaced pair of conductive plate elements which significantly increase the total area of each electrode plate, and thereby correspondingly increase the current handling capacity of the capacitor.
Abstract:
An electromagnetic interference (EMI) filter capacitor assembly is provided for shielding and decoupling a conductive terminal pin or lead of the type used, for example, in an implantable medical device against passage of external interference signals. The EMI filter is constructed of relatively inexpensive ceramic chip capacitors which replace relatively expensive feedthrough capacitors as found in the prior art. The chip capacitors are mounted directly onto a hermetic feedthrough terminal in groups of two or more which vary in physical size, dielectric material and capacitance value so that they self-resonate at different frequencies. This "staggering" of resonant frequencies and direct installation at the hermetic terminal provides the EMI filter with sufficient broadband frequency attenuation. In one preferred form, multiple chip capacitor groupings are mounted onto a common base structure, with each capacitor grouping associated with a respective terminal pin. In another preferred form, a non-conductive substrate is provided with metalized circuit traces to better accommodate the mounting of the chip capacitors. Additionally, novel chip capacitor geometry/termination-metallization is provided which significantly reduces the internal inductance of the capacitor to improve its high frequency performance as an EMI filter.
Abstract:
An internally grounded ceramic feedthrough filter capacitor assembly provides for the shielding and decoupling of a conductive terminal pin or lead of the type used, for example, in an implantable medical device such as a cardiac pacemaker or cardioverter defibrillator against passage of external interference signals, such as those caused by digital cellular phones. The assembly includes a terminal pin subassembly having at least one terminal pin supported within a conductive ferrule by a hermetically sealed insulator structure. The ferrule is adapted for mounting onto a conductive substrate, such as a pacemaker housing, by welding or brazing to support the terminal pin subassembly for feedthrough passage to the housing interior. A ceramic feedthrough capacitor is mounted at an inboard side, with the capacitor electrode plate sets coupled respectively to a grounded lead and to the terminal pins(s) by conductive adhesive, soldering, brazing or the like. In preferred forms of the invention, multiple feedthrough filter capacitors are provided in a substantially coplanar array within a common base structure, with each capacitor in association with a respective terminal pin.
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.
Abstract:
FIG. 1 is a perspective view of a wine aerator stand embodying our new design; FIG. 2 is a front elevation view of the structure of FIG. 1; FIG. 3 is a rear elevation view of the structure of FIG. 1; FIG. 4 is a right side elevation view of the structure of FIG. 1; FIG. 5 is a left side elevation view of the structure of FIG. 1; FIG. 6 is a top plan view of the structure of FIG. 1; and, FIG. 7 is a bottom plan view of the structure of FIG. 1.
Abstract:
A hollow expansion chamber of the present invention is configured to temporarily contain an expansion of bubbles during an aeration process for aerating a liquid, where a chamber body of the expansion chamber has a rounded shape. When moving circumferentially downward along the chamber body starting from a maximum inside diameter, the rounded shape of a bottom portion has a first integral transition that is a tangential transition to a first frustoconical shape. Continuing moving circumferentially downward, the first frustoconical shape has a second integral transition to a cylindrical extension. The cylindrical extension at a distal end has a bottom opening configured to fit within an opened bottleneck. The first frustoconical shape has a minimum angle of 15 degrees relative to a horizontal plane. The second integral transition is a radial second integral transition having an inside surface radius of at least 0.25 inches.
Abstract:
A rigid frame is sealed in a waterproof manner to a pair of pants and/or waders, where the frame forms a frame aperture separating an outside from an inside of the pair of pants and/or waders. A rigid lid is pivotably connected to the frame and configured to engage the frame aperture. The rigid lid in an open position allows access through the frame aperture and the rigid lid in a closed position does not allow access through the frame aperture. A seal is disposed between the frame and the lid forming a waterproof closure of the frame aperture when the lid is in the closed position. A latch is pivotably connected to the frame and configured to retain the lid in the closed position. A spring is disposed between the latch and the frame, the spring biasing the latch to retain the lid in the closed position.
Abstract:
An aeration assembly for aerating liquids including wine and other alcoholic beverages includes an expansion chamber and an aerating device. The expansion chamber is configured to be in fluid communication with an inside of the uncorked and/or opened bottle when engaged by a bottom portion of the expansion chamber. The aerating device comprises a gas conduit having a proximal end in fluid communication with a distal end. The distal end is disposable below the bottom portion of the expansion chamber. A gas source is in fluid communication with the proximal end of the gas conduit. The expansion chamber is configured to temporarily contain an expansion of bubbles during an aeration process. The expansion chamber and aerating device are not permanently connected, wherein the aerating device can be fully removed from the expansion chamber before, during or after the aeration process.
Abstract:
A wine aerator includes a gas conduit having a proximal end in fluid communication with a distal end, wherein the gas conduit passes through a seal and wherein the distal end is configured to be insertable into an inside of an uncorked wine bottle. A gas source is connectable to the proximal end of the gas conduit and is in fluidic communication with the gas conduit, wherein the gas source comprises an air pump having an adjustable flow rate of at least 0.1 liters per minute up to a maximum of 20 liters per minute. A bubble-generating aeration element is disposed at the distal end of the gas conduit and in fluidic communication with the gas conduit. The bubble-generating aeration element comprises a porous material having an average pore size of at least 1 micron up to a maximum of 500 microns.