Patents Represented by Attorney John L. Rooney
  • Patent number: 4608322
    Abstract: A nonaqueous cell comprising an active metal anode, such as a lithium, sodium, potassium, calcium or alloys, a liquid cathode-electrolyte comprising a solute dissolved in a solvent which, in a preferred aspect, is an oxyhalide of an element of Group V or Group VI of the Periodic Table and wherein the surface of the anode contacting the cathode-electrolyte is coated with a polymeric film having ether linkages. In a preferred practice of the present invention, the anode is coated with polyethersulfone.
    Type: Grant
    Filed: September 28, 1984
    Date of Patent: August 26, 1986
    Assignee: Medtronic, Inc.
    Inventors: William G. Howard, David R. Berberick
  • Patent number: 4606118
    Abstract: A body implantable lead for the delivery of stimulation energy to a desired body site including a drug dispenser carried by the lead which retains a drug to be dispensed while allowing the dispensing of that drug at least adjacent the desired body stimulation site. The lead is provided with an electrode having a bore open to a drug storage chamber which contains an absorbent plug. The drug is loaded into the absorbent plug, prior to use, by soaking the electrode in a solution containing the drug.
    Type: Grant
    Filed: February 27, 1985
    Date of Patent: August 19, 1986
    Assignee: Medtronic, Inc.
    Inventors: Norbert H. Cannon, James E. Graf
  • Patent number: 4603696
    Abstract: A connection system for joining a medical electrical stimulator to its electrical stimulus delivery system features a first member having a row of more than two contact surfaces each spaced apart a given distance from the adjacent contact surfaces, and a second member having at least the same number of contacts in a row each spaced from the adjacent contact surface by a multiple of the spacing between the contact surfaces of the first member and each being connected to one of two electrical conductors so that electrical connections between the contact surfaces are varied as the two connector members are relatively moved along the rows.
    Type: Grant
    Filed: February 14, 1985
    Date of Patent: August 5, 1986
    Assignee: Medtronic, Inc.
    Inventors: Thomas E. Cross, Jr., Gerald J. Hults
  • Patent number: 4600495
    Abstract: An improved flow through ion sensing electrode and a method for producing it. The electrode is formed of bilumen plastic tubing using one lumen as the sample path and the other lumen as a sensing chamber. By permeating a portion of the tubing with an ion selective material, an ion selective membrane integral with the chamber wall is produced. A preferred embodiment also incorporates a reference electrode.
    Type: Grant
    Filed: August 15, 1985
    Date of Patent: July 15, 1986
    Assignee: Medtronic, Inc.
    Inventor: Eric J. Fogt
  • Patent number: 4596252
    Abstract: A pacemaker sense amplifier circuit exhibiting a very high common mode rejection ratio for detecting intracardiac electrogram signals is disclosed. The circuit includes a sampling capacitor which is differentially charged by the intracardiac signal. The voltage stored on the sampling capacitor is periodically applied to a high input impedance differential voltage amplifier which is referenced to the battery ground. The signal is smoothed and reconstructed by a bandpass filter, and is applied to a comparator to generate a logic level pulse indicative of the occurrence of a cardiac depolarization.
    Type: Grant
    Filed: May 6, 1985
    Date of Patent: June 24, 1986
    Assignee: Medtronic, Inc.
    Inventor: Gary E. Nelson
  • Patent number: 4595009
    Abstract: An implantable medical device to deliver cardioverting energy to cardiac tissue in synchrony with detected ventricular depolarizations having a low power sensing and control circuitry and high power cardioversion circuitry, sharing a common lead and interface circuitry. The lead possesses a superior vena cava electrode and ring and tip electrodes intended to be placed in the ventricle. A sense amplifier is connected across the ring and tip electrode, and the cardioversion energy is delivered across the superior vena cava electrode and the ventricular electrodes. A circuit for protecting the low voltage sense amplifier circuits from high voltage cardioversion output pulses includes a triac which is electrically shorted across the ring and tip electrodes and the input terminals of the sense amplifier during the delivery of the stimulating pulse.
    Type: Grant
    Filed: September 30, 1985
    Date of Patent: June 17, 1986
    Assignee: Medtronic, Inc.
    Inventor: Robert Leinders
  • Patent number: 4593053
    Abstract: Novel, hydrophilic, skin-compatible, pressure sensitive, solid, adhesive gel hydrogel composition comprising 25 to 50 weight percent polyvinyl pyrolidone (PVP) preferably having a molecular weight in the range of about 100,000 to 600,000, 2 to 5 weight percent polyvinyl alcohol (PVA) preferably having a molecular weight in the range of about 150,000 to 300,000, about 5 to about 40 weight percent humectant, about 3 to about 50 weight percent water, about 0 to about 50 weight percent of an ionic species. In a preferred aspect, the composition of the invention is utilized in an iontophoresis device to provide a hydrophilic gel matrix from which a drug is iontophoretically delivered.
    Type: Grant
    Filed: December 7, 1984
    Date of Patent: June 3, 1986
    Assignee: Medtronic, Inc.
    Inventors: Allan H. Jevne, Brett R. Vegoe, Carolann M. Holmblad, Patrick T. Cahalan
  • Patent number: 4593284
    Abstract: Real time analog and digital information are simultaneously transmitted from a transmitter circuit. In the disclosed embodiment, the analog signals are obtained from ECG apparatus and the digital signals are derived by a process or from analysis of the ECG signals. The system is implemented by summing the output signals from the FM oscillator and the FSK oscillator in an amplitude summing amplifier and transmitting the result in combined waveform, preferably over a phone line, although radio transmission may alternately be used as well as other types of transmission of the resulting signal.In the present invention, the analog signal is employed to frequency modulate a frequency modulated oscillator, and the digital information signal is used to obtain frequency shift keying of a FSK oscillator.
    Type: Grant
    Filed: March 14, 1984
    Date of Patent: June 3, 1986
    Assignee: Medtronic, Inc.
    Inventors: Mark J. Clifford, Robert H. Hock, Douglas M. Jagunich, Paul J. Robinson
  • Patent number: 4577633
    Abstract: A self-adapting demand pacemaker that recognizes the tachycardia from the intrinsic signals and initiates treatment in the following manner: First, the escape interval of the demand pacemaker is shortened to be identical to the cycle length of the tachycardia, then to overdrive the tachycardia the pacemaker escape interval is continuously shortened with each subsequent beat, for a predetermined number of beats, by a small programmable decrement. Thereafter, the escape interval is restored to its original value and protects against a potential bradycardia. It has to be emphasized that the pacemaker remains in demand mode all of the time; thus stimulation in a vulnerable zone is prevented and some of the hazards that accompany overdrive pacing are reduced.
    Type: Grant
    Filed: March 28, 1984
    Date of Patent: March 25, 1986
    Assignee: Medtronic, Inc.
    Inventors: Barouh V. Berkovits, Menashe B. Waxman, William J. Combs
  • Patent number: 4577642
    Abstract: A body implantable lead for the delivery of stimulation energy to a desired body site including a drug dispenser carried by the lead which retains a drug to be dispensed while allowing the dispensing of that drug at least adjacent the desired body stimulation site. The drug is retained in a cavity within the lead, in the form of a solid plug or a powder wherein the drug is compounded with an appropriate molecular sieve material. The drug is released only after the molecular sieves are activated by exposure to water. In those embodiments in which the molecular sieves take the form of a powder, the molecular sieves and drug may be conveniently loaded into the electrode, after manufacture and prior to implant.
    Type: Grant
    Filed: February 27, 1985
    Date of Patent: March 25, 1986
    Assignee: Medtronic, Inc.
    Inventor: Kenneth B. Stokes
  • Patent number: 4572605
    Abstract: An in-line connector assembly for use with electrode leads employing plural, coaxial, coiled conductors. The connector assembly includes a connector ring, a connector pin, and an insulating sleeve separating the connector ring and connector pin. The insulating sleeve is molded to the connector ring and connector pin, prior to attachment to the proximal end of a multiconductor lead.
    Type: Grant
    Filed: August 9, 1984
    Date of Patent: February 25, 1986
    Assignee: Medtronic, Inc.
    Inventor: Douglas N. Hess
  • Patent number: 4570637
    Abstract: An improved medical electrode is particularly adapted for transmitting DC currents. The electrode includes (1) an electrically conductive substrate electrically connected to a stud member and chemically inert with respect to the electrically and ionically conductive material, such as a gel, coupling the electrode to the skin of the user, and (2) a predetermined amount of an electrically-conductive material, preferably silver, disposed on the substrate in spaced relationship to the stud member and interfacing with the electrically and ionically conductive material.
    Type: Grant
    Filed: October 20, 1983
    Date of Patent: February 18, 1986
    Assignee: Andover Medical Incorporated
    Inventors: Robert L. Gomes, Joseph P. Maffione
  • Patent number: 4565666
    Abstract: A combination ion sensing and reference electrode and a method for producing it. The electrode is formed of bi-lumen plastic tubing using one lumen as sensing chamber and the other as a reference chamber. A portion of the sensing chamber extends distally relative to the reference chamber, and is permeated with an ion selective material by soaking that portion in a solution containing the ion selective material. The method of manufacture is thereby simplified and sealing of the chambers is improved.
    Type: Grant
    Filed: July 18, 1984
    Date of Patent: January 21, 1986
    Assignee: Medtronic, Inc.
    Inventors: Patrick T. Cahalan, Michelle A. Schwinghammer
  • Patent number: 4565665
    Abstract: An improved flow through ion sensing electrode and a method for producing it. The electrode is formed of bilumen plastic tubing using one lumen as the sample path and the other lumen as a sensing chamber. By permeating a portion of the tubing with an ion selective material, an ion selective membrane integral with the chamber wall is produced. A preferred embodiment also incorporates a reference electrode.
    Type: Grant
    Filed: August 3, 1983
    Date of Patent: January 21, 1986
    Assignee: Medtronic, Inc.
    Inventor: Eric J. Fogt
  • Patent number: 4558284
    Abstract: The frequency-modulated demodulator is provided in which the frequency-modulated signal as having a relatively narrow range of frequency modulation is demodulated by providing a pulse which corresponds to the positive half-wave cycles of the signal and then generating an extended duration pulse from the initiation of the first pulse produced to the second pulse produced in two consecutive cycles. In this manner every other cycle of the FM demodulated signal provides an output pulse which substantially corresponds to the duration of one cycle of the FM signal. A high frequency clock on the order of 1,000 times faster than the frequency of the extended duration signals is gated through for substantially the entire width of the extended pulse duration. The number of clock pulses that are gated through or counted to provide an indication of the frequency signal, a sampled basis corresponding to every other cycle of the FM signal.
    Type: Grant
    Filed: March 12, 1984
    Date of Patent: December 10, 1985
    Assignee: Medtronic, Inc.
    Inventor: Gary A. Zaidenweber
  • Patent number: D282968
    Type: Grant
    Filed: July 1, 1983
    Date of Patent: March 11, 1986
    Assignee: Medtronic, Inc.
    Inventor: Eugene A. Dickhudt
  • Patent number: RE32091
    Abstract: A dual channel neuromuscular stimulator. Pulses developed by a pulse generator are transmitted alternately on both channels to involuntarily contract muscles. The stimulator has variable on/off cycling capability to provide flexibility in meeting the stimulation needs of patients and has output current adjustments and other variable parameter settings to achieve optimum neuromuscular stimulation. To enhance patient comfort, the stimulation output of the stimulator can be slowly "ramped up" to its full stimulation power to allow the increase in stimulation to occur at various rates to accommodate the differing characteristics of different muscle groups. A jack is provided to permit the stimulation to be controlled by an external switch operated by a clinician to coordinate stimulation of various muscle groups with voluntary muscle contraction by the patient. The jack can also be connected to a heel operated switch to stimulate muscle groups to allow certain disabled persons to walk normally.
    Type: Grant
    Filed: October 24, 1983
    Date of Patent: March 11, 1986
    Assignee: Medtronic, Inc.
    Inventor: David J. Stanton
  • Patent number: H71
    Abstract: An iontrophoretic medical device has a first light of controlled brightness. Iontophoretic contact with skin is measured by current flow and a second light is illuminated in proportion to current flow. Generally, equivalent brightness of the two lights indicates successful iontophoretic contact.
    Type: Grant
    Filed: August 3, 1984
    Date of Patent: June 3, 1986
    Assignee: Medtronic, Inc.
    Inventors: Paul D. Sorenson, Gary A. Lattin
  • Patent number: RE32227
    Abstract: A body implantable lead having a two-piece stylet. An inner solid portion of the stylet enables a shape to be imparted to the stylet to allow proper maneuvering of the lead during implant. A second portion of the stylet is slideably located coaxially about the first portion. The second portion of the stylet permits the imposition of a torque at the distal end of the implantable lead by the turning of a knob fixedly attached to the proximal end of the second portion of the stylet. The second portion of the stylet is a helically wound coil. The two-piece stylet is inserted into the proximal end of the body implantable lead. The distal end of the body implantable lead is located in the position desired through the use of the solid inner first portion of the stylet in which a bend or other desired shape has been introduced. The body implantable lead is permanently attached to the muscle tissue by a fixation device activated through the torque supplied by the second portion of the stylet.
    Type: Grant
    Filed: April 16, 1985
    Date of Patent: August 19, 1986
    Assignee: Medtronic, Inc.
    Inventor: Robert G. Dutcher
  • Patent number: H150
    Abstract: An implantable fluid dispensing device has an accessory housing set into the biocompatible shape of its device canister. A shelf is set into the canister to accept the accessory housing which contains a filter, an externally accessible infusion septum, or other accessory. The function of accessories in the accessory housing is independently tested. After an accessory is selected to match the particular application, the accessory module is mounted on the canister.
    Type: Grant
    Filed: August 3, 1984
    Date of Patent: November 4, 1986
    Assignee: Medtronic, Inc.
    Inventors: Douglas O. Hankner, Larry A. Lundeen