Patents by Inventor David W. Newton

David W. Newton has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5522805
    Abstract: A monitor to provide substantially real-time estimates of fluid absorbed by a patient during an endoscopic surgical procedure. The monitor comprises means for weighing fluid administered to the patient intravenously, as well as that introduced through the endoscope for irrigation purposes. In addition, means are provided for weighing fluid recovered from the patient, the endoscope, and the surgical drapes. The total weight of fluid administered, reduced by subtracting the total weight of fluid recovered, comprises the calculated fluid absorbed. Through manual entries and/or switch settings, computing means maintain totals of fluid administered and fluid collected even as fluid sources are replaced and the fluid collector is emptied. Optional verticality compensation means and anti-rotation devices are included.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: June 4, 1996
    Assignee: Aquintel, Inc.
    Inventors: Thierry G. Vancaillie, Robert K. Mitchiner, David W. Newton
  • Patent number: 5312401
    Abstract: A safety shield for use in laparoscopic or like electrosurgical procedures where the shield surrounds the active electrode and extends from a trocar or the like to the field of view of the surgical procedure. The shield is connected to the return lead via a low impedance path which includes monitor circuitry for determining whether the shield current is associated with an abnormal condition.
    Type: Grant
    Filed: July 10, 1991
    Date of Patent: May 17, 1994
    Assignee: Electroscope, Inc.
    Inventors: David W. Newton, Roger C. Odell, Don R. Boyle
  • Patent number: 5172842
    Abstract: The magnetized punch of the tool breaks off the tang and holds the tang until the punch is withdrawn into an opening in a vacuum conduit. The tang is thereby removed from the punch and it becomes entrained in a vacuum flow, detected and accounted for before passing into a collection chamber.
    Type: Grant
    Filed: December 13, 1991
    Date of Patent: December 22, 1992
    Assignee: Emhart, Inc.
    Inventors: Donald P. Viscio, Peter C. Thomas, David W. Newton
  • Patent number: 5147379
    Abstract: An improved insertion instrument for a vena cava filter is provided and iudes a filter retainer attached to the catheter for preventing accidental ejection of the filter and for enabling retraction of the filter into the carrier body at any time prior to complete ejection; a directional control mechanism attached to the plunger housing for allowing a user to guide the filter retainer through a vascular network; and a simplified plunger locking mechanism on the plunger for preventing premature ejection of the filter.
    Type: Grant
    Filed: November 26, 1990
    Date of Patent: September 15, 1992
    Assignee: Louisiana State University and Agricultural and Mechanical College
    Inventors: Mehdy Sabbaghian, Tony Barfield, Patrick Schiele, David W. Newton, Gregory J. Lormand, Glen J. Schwartzberg
  • Patent number: 4827927
    Abstract: An electrosurgical generating system and method including an electrosurgical generator; and a handpiece including an active electrode connected to the electrosurgical generator for applying electrosurgical current from the generator to a patient, the handpiece having switches disposed thereat for changing the level of the output power delivered from said generator to said patient whereby the change may be effected from the sterile field of a surgical procedure. The above switches together with cut and coagulation mode switches disposed at the handpiece are so connected as to minimize the number of wires needed to connect the handpiece to the generator. Decoding circuitry for determining the status of the switches is also disclosed.
    Type: Grant
    Filed: December 26, 1984
    Date of Patent: May 9, 1989
    Assignee: Valleylab, Inc.
    Inventor: David W. Newton
  • Patent number: 4416277
    Abstract: A return electrode monitoring system for use with a patient return electrode adapted for contacting a patient, the return electrode having two, spaced apart conductors attached thereto for connecting the electrode to a generator of electrosurgical current which passes through the electrode, the system comprising means for applying a monitoring current through the conductors to the electrode; detecting means responsive to the monitoring current for producing a signal which is a function of the impedance between the two conductors, the detecting means including means for substantially eliminating any effect the electrosurgical current might have on the production of the signal when the generator is operational and the patient is in contact with the electrode; means for establishing a desired range having at least an upper limit for the impedance; and determining means responsive to the signal for determining whether the impedance is within the desired range.
    Type: Grant
    Filed: November 3, 1981
    Date of Patent: November 22, 1983
    Assignee: Valleylab, Inc.
    Inventors: David W. Newton, Frederic M. Hulett, III, Christopher Ovens
  • Patent number: 4416276
    Abstract: A return electrode monitoring system for use with a split patient return electrode having two, electrically isolated electrode elements adapted for contacting a patient, the system comprising means responsive to the impedance between the two electrode elements for producing a signal which is a function of the impedance; means for establishing a desired range having an upper limit and a lower limit for the impedance when the patient is in contact with the electrode elements; determining means responsive to the signal for determining whether the impedance is within the desired range; and adjusting means for adjusting the upper limit to adapt the system to the particular impedance of the patient in response to the particular impedance occurring within the desired range.
    Type: Grant
    Filed: October 26, 1981
    Date of Patent: November 22, 1983
    Assignee: Valleylab, Inc.
    Inventors: David W. Newton, William G. Paterson
  • Patent number: 4255088
    Abstract: An improved liquid pumping system wherein gas within the pump may be detected to indicate an error in desired flow rate or displaced volume. The system may be shut down if excessive gas is detected in the pump. Further, the flow rate may be corrected to the desired rate.
    Type: Grant
    Filed: June 14, 1979
    Date of Patent: March 10, 1981
    Assignee: Valleylab, Inc.
    Inventors: David W. Newton, John M. Gibilisco
  • Patent number: 4231372
    Abstract: A safety monitoring circuit for use in an electrosurgical unit is disclosed. The circuit is useful to indicate a fault in the return path between an RF source and a patient electrode in contact with a patient to prevent electrical burns to the patient that can occur due to improper patient contact with the patient electrode or a break in the return path. The circuit includes a current sensor connected in series in the return path to the RF source, which sensor provides an output indicative of the sensed current that is coupled through a DC amplifier to a comparator, the comparator providing an output only if a predetermined threshold is exceeded. When a comparator output is provided, a timer is triggered to energize, for a predetermined period of time, an alarm to indicate a sensed fault and/or actuate disabling circuitry to terminate application of electrical energy to the active electrode utilized in electrosurgery for cutting or coagulation.
    Type: Grant
    Filed: November 4, 1974
    Date of Patent: November 4, 1980
    Assignee: Valleylab, Inc.
    Inventor: David W. Newton
  • Patent number: 4094320
    Abstract: An improved electrosurgical safety circuit where the currents in the active and patient leads are monitored, the monitored currents being respectively rectified and then subtracted from one another. Whenever the active current exceeds the patient or return current by an amount corresponding to a dynamically variable threshold, an appropriate measure is taken such as the sounding of an alarm and/or the de-energization of the electrosurgical generator. The dynamic threshold varies in accordance with the level of the signal applied to the patient and compensates for leakage current through stray capacitance from the active lead to ground.The patient lead is substantially grounded at radio frequencies through a frequency sensitive network. The frequency sensitive network may include a capacitor, the value of which is such as to provide the foregoing frequency response.
    Type: Grant
    Filed: September 9, 1976
    Date of Patent: June 13, 1978
    Assignee: Valleylab, Inc.
    Inventors: David W. Newton, Frank A. Alford
  • Patent number: 3963030
    Abstract: A signal generating device and method for producing an RF output signal regulated in power and of decaying amplitude suitable for use in an electrosurgical generator for surgical coagulation purposes. The device includes a circuit tuned to a predetermined radio frequency suitable to prevent nerve stimulation and the tuned circuit has connected therewith an unregulated power supply with current through the tuned circuit being controlled by means of a solid state switching system. The tuned circuit includes an inductor initially charged to a predetermined energy level.
    Type: Grant
    Filed: November 1, 1974
    Date of Patent: June 15, 1976
    Assignee: Valleylab, Inc.
    Inventor: David W. Newton
  • Patent number: 3946738
    Abstract: Circuitry for cancelling leakage current is disclosed. The leakage cancelling circuit is utilized in conjunction wih the active or patient electrodes of an electrosurgical instrument used in electrosurgery. In electrosurgery, a radio frequency current is passed through a patient between an active electrode and a patient electrode with the active electrode determining the point where surgery is performed and the patient electrode being made surgically inactive by large patient contact area. Current leakage at the electrodes is caused by stray capacity to ground in an isolated system and excessive leakage from the active electrode to ground can cause surgery to be performed without a patient connection while excessive leakage from the patient electrode to ground can cause RF burns to the patient and perhaps to operating room personnel having contact with the patient.
    Type: Grant
    Filed: October 24, 1974
    Date of Patent: March 30, 1976
    Inventors: David W. Newton, John M. Adan