Patents Assigned to Novametrix Medical Systems Inc.
  • Patent number: 6648831
    Abstract: Apparatus and methods for non-invasively determining cardiac output using partial re-breathing techniques are disclosed in which the apparatus is constructed with an instantaneously adjustable deadspace for accommodating differences in breathing capacities of various patients. The apparatus is constructed of inexpensive elements, including a single two-way valve which renders the apparatus very simple to use and inexpensive so that the unit may be readily disposable. The method of the invention provides a novel means of estimating cardiac output based on alveolar CO2 values rather than end-tidal CO2 values as previously practiced. A program for calculating cardiac output is also disclosed.
    Type: Grant
    Filed: January 23, 2001
    Date of Patent: November 18, 2003
    Assignee: Novametrix Medical Systems, Inc.
    Inventors: Joseph A. Orr, Scott A. Kofoed, Dwayne Westenskow, Michael B. Jaffe
  • Patent number: 6306098
    Abstract: Apparatus and methods for non-invasively determining cardiac output using partial re-breathing techniques are disclosed in which the apparatus is constructed with an instantaneously adjustable deadspace for accommodating differences in breathing capacities of various patients. The apparatus is constructed of inexpensive elements, including a single two-way valve which renders the apparatus very simple to use and inexpensive so that the unit may be readily disposable. The method of the invention provides a novel means of estimating cardiac output based on alveolar CO2 values rather than end-tidal CO2 values as previously practiced. A program for calculating cardiac output is also disclosed.
    Type: Grant
    Filed: December 19, 1996
    Date of Patent: October 23, 2001
    Assignee: Novametrix Medical Systems Inc.
    Inventors: Joseph A. Orr, Scott A. Kofoed, Dwayne Westenskow, Michael B. Jaffe
  • Patent number: 6126610
    Abstract: A connector for connecting segments of one or more pneumatic tubes including a first member, a second member and a sealing element. The first member and second member are configured to interconnect with each other with the sealing element therebetween. The first member and second member each include at least one cooperating nipple which is insertable into a corresponding port formed through the sealing element. An airtight interference fit is formed between each port and the associated parts of the nipples inserted therein. The connector may also include a mechanism which identifies a type of sensor attached to one of the members to a monitor or other host device attached to the other member. Preferably, the connector also includes an alignment mechanism to ensure proper polarity of pluralities of tube segments associated with each of the first and second members. The connector may also include a keying structure for ensuring that only compatible devices are coupled thereby.
    Type: Grant
    Filed: November 3, 1997
    Date of Patent: October 3, 2000
    Assignee: Novametrix Medical Systems, Inc.
    Inventors: David R. Rich, John R. Nobile
  • Patent number: 5820550
    Abstract: An improved pulse oximeter apparatus and method for the measurement of oxygen saturation in the blood, which is faster and more accurate than conventional pulse oximeters. Improved speed and accuracy is attained by elimination of normalization and feedback circuitry and the use of analog to digital converting devices having a wide dynamic range along with a sophisticated computer analysis. The instant invention eliminates inaccuricies resulting from channel matching errors, and detects and eliminates aberrant input data.
    Type: Grant
    Filed: March 16, 1995
    Date of Patent: October 13, 1998
    Assignee: Novametrix Medical Systems Inc.
    Inventors: Michael John Ross Polson, Gregory Llewelyn Morris
  • Patent number: 5789660
    Abstract: An integrated airway adapter capable of monitoring CO.sub.2 concentration in real time, breath by breath using infrared absorption techniques and monitoring respiratory flow with differential pressure flowmeters under diverse inlet conditions through improved sensor configurations which minimize phase lag and dead space within the airway adapter.
    Type: Grant
    Filed: July 15, 1996
    Date of Patent: August 4, 1998
    Assignee: Novametrix Medical Systems, Inc.
    Inventors: Scott A. Kofoed, Joseph A. Orr, David R. Rich
  • Patent number: 5718225
    Abstract: A system and method are disclosed for supporting orotracheal tubing in the mouth and trachea of pediatric patient (e.g., infant) during prolonged intubation. In general, the system comprises an intraoral component and an extraoral component, each of unitary construction. The intraoral components includes a base portion and an alveolar ridge cushioning flap portion. The base portion has a longitudinal extent, a bore formed along the longitudinal extent for passage and support of a first selected portion of the endotracheal tubing, and a palate facing surface made of a soft resilient material for cushioning the palate of the infant during intubation. The extraoral component of the system includes a flexible lip cushioning flap portion and a tubing clasping portion. A centrally disposed hole is formed in the lip cushioning flap portion for releasable receipt of a projection extending from the alveolar ridge cushioning portion.
    Type: Grant
    Filed: August 18, 1995
    Date of Patent: February 17, 1998
    Assignee: Novametrix Medical Systems, Inc.
    Inventors: Nadarasa Visveshwara, Roy Oto
  • Patent number: 5616923
    Abstract: Gas analyzer systems which include: (1) a transducer for outputting a signal indicative of the concentration of a specified gas in a sample which may contain that gas, and (2) an airway adapter or cuvette with a flow passage for confining the sample to a particular path traversing the transducer. The cuvettes feature radiant energy transmitting windows which are flush mounted in apertures on opposite sides of the cuvette flow passage and are fabricated from a polymer such as biaxially oriented polypropylene which is malleable, yet resistant to wrinkling, warping, and other forms of distortion. Retainer rings keep the windows flat and distortion free with an accurately reproducible spacing between the windows.
    Type: Grant
    Filed: September 2, 1994
    Date of Patent: April 1, 1997
    Assignee: Novametrix Medical Systems Inc.
    Inventors: David R. Rich, Gerald R. Apperson, Lawrence L. Labuda, Leslie E. Mace
  • Patent number: 5443060
    Abstract: A system and method are disclosed for supporting orotracheal tubing in the mouth and trachea of pediatric patient (e.g., infant) during prolonged intubation. In general, the system comprises an intraoral component and an extraoral component, each of unitary construction. The intraoral components includes a base portion and an alveolar ridge cushioning flap portion. The base portion has a longitudinal extent, a bore formed along the longitudinal extent for passage and support of a first selected portion of the endotracheal tubing, and a palate facing surface made of a soft resilient material for cushioning the palate of the infant during intubation. The extraoral component of the system includes a flexible lip cushioning flap portion and a tubing clasping portion. A centrally disposed hole is formed in the lip cushioning flap portion for releasable receipt of a projection extending from the alveolar ridge cushioning portion.
    Type: Grant
    Filed: January 5, 1994
    Date of Patent: August 22, 1995
    Assignee: Novametrix Medical Systems, Inc.
    Inventors: Nadarasa Visveshwara, Roy Oto
  • Patent number: 5190038
    Abstract: An improved pulse oximeter for the measurement of oxygen saturation in the blood, which is faster and more accurate than conventional pulse oximeter. Improved speed and accuracy is attained by elimination of normalization and feedback circuitry and the use of analog to digital converting devices having a wide dynamic range along with a sophisticated computer analysis. The instant invention eliminates inaccurcies resulting from channel matching errors, and detects and eliminates aberrant input data.
    Type: Grant
    Filed: November 1, 1989
    Date of Patent: March 2, 1993
    Assignee: Novametrix Medical Systems, Inc.
    Inventors: Michael J. R. Polson, Gregory L. Morris
  • Patent number: 5170786
    Abstract: A probe system for removable attachment to a patient in which the probe containing light emitter and detector elements is separable from a fastener for securing the probe to the skin of a patient to enable the fastener to be discarded and the probe reused. Apertures in the fastener complementary to the probe housings enable secure stabilization of the probe system on the skin and maintain a fixed relationship between the light emitter and detector elements.
    Type: Grant
    Filed: December 16, 1991
    Date of Patent: December 15, 1992
    Assignee: Novametrix Medical Systems, Inc.
    Inventors: Simon W. H. Thomas, Herbert F. D'Alo
  • Patent number: 4932410
    Abstract: A transcutaneous sensor probe having dual sensing electrodes responsive to the effects of two different transcutaneous gases on an ion solution separated from the skin surface by a selectively permeable seal having respective regions overlying the corresponding electrodes. The permeable seal is mounted on a removable fixation ring which is indexed to ensure alignment between each region of the seal and its respective electrode when the fixation ring is connected to the electrode housing.
    Type: Grant
    Filed: October 18, 1988
    Date of Patent: June 12, 1990
    Assignee: Novametrix Medical Systems, Inc.
    Inventors: William J. Lacourciere, David R. Rich
  • Patent number: 4865038
    Abstract: A sensor appliance removably attachable to a living body for non-invasively producing signals indicative of a condition of the body and applying them to a monitoring or measuring device and method of making the appliance characterized by a small, highly flexible light weight substrate with surface mounted light emitting and photodetector components hermetically sealed in a flexible moisture resistant envelope. Provision is made for inclusion of a form sustaining spine to enhance positional stability.
    Type: Grant
    Filed: October 9, 1986
    Date of Patent: September 12, 1989
    Assignee: Novametrix Medical Systems, Inc.
    Inventors: David Rich, Simon Thomas
  • Patent number: 4759369
    Abstract: A pulse oximeter includes a capacitive d.c. blocking element to separate the time varying red and infra-red components of a light source transmitted through or reflected form the blood from the composite light signals. The magnitudes of the signal amplitudes are then digitized and converted for use as independent variables applied to a ROM based look-up table to determine blood oxygen saturation.
    Type: Grant
    Filed: July 7, 1986
    Date of Patent: July 26, 1988
    Assignee: Novametrix Medical Systems, Inc.
    Inventor: Andrew C. Taylor
  • Patent number: 4541901
    Abstract: The calibration of a polarographic oxygen sensor (20) at zero oxygen concentration is accomplished by providing an oxygen-free liquid environment at the sensor active surface. This is accomplished electrolytically by depleting a thin film of electrolyte (24) of oxygen to zero concentration with an oxygen-reducing cathode (6), and complementary anode (4), connected via a battery (10) and switch (12). The sensor (20) is placed into close proximity with the electrodes (4,6) and the oxygen in the electrolyte (24) reduced while its concentration is measured by the sensor (20). A low steady-state signal for the sensor provides the zero oxygen concentration calibration point.
    Type: Grant
    Filed: April 25, 1984
    Date of Patent: September 17, 1985
    Assignee: Novametrix Medical Systems, Inc.
    Inventors: Dawood Parker, David T. Delpy
  • Patent number: 4367735
    Abstract: An improved nasal cannula is made of a soft pliable material and has two hollow tubular prongs which are ribbed to prevent significant closure of the airways through the prongs upon bending of the prongs and a base adapted to receive a soft strip of foam-like material which can be attached to a skull cap for securing the prongs of the cannula in the nasal passages of a patient.
    Type: Grant
    Filed: December 31, 1979
    Date of Patent: January 11, 1983
    Assignee: Novametrix Medical Systems, Inc.
    Inventor: Carmelo Dali
  • Patent number: 4301807
    Abstract: An improved apparatus for non-invasive measurement of transcutaneous carbon dioxide pressure employs a skin engaging sensor including pH and reference electrodes and a temperature sensor. The temperature sensor produces an output signal voltage having a characteristic which can be the same as or the complement of the voltage-temperature characteristic of the deviation voltage component of the pH-reference electrode voltage attributable to temperature deviation effects on the sensor as well as on the skin. An error signal voltage produced at the output of the temperature sensor is combined with the voltage measured across the pH and reference electrodes to provide a corrected voltage having a magnitude indicative of transcutaneous carbon dioxide pressure at a predetermined reference temperature without need to heat the skin or electrode or otherwise control their temperatures.
    Type: Grant
    Filed: December 5, 1979
    Date of Patent: November 24, 1981
    Assignee: Novametrix Medical Systems, Inc.
    Inventor: Richard A. Mentelos
  • Patent number: 4291691
    Abstract: An adapter to be connected between a respirator and a patient artificial airway has an axial bore communicating between the respirator and artificial airway and one or more sloping bores communicating between the axial bore and the periphery of the adapter body to provide one or more respective access openings leading to the bore through which a suction catheter can be inserted. Means for sealing the access openings from the ambient environment when a suction catheter is not in use is provided by an access closure means which includes a member movable on the adapter body and an elastomeric sealing means which is compressed about each access opening to form an airtight seal when the access closure means is in a position to cover the access openings. Each access opening can accept a catheter for insertion through the axial bore and into the artificial airway when the access closure means is in a position to expose the access opening.
    Type: Grant
    Filed: October 30, 1978
    Date of Patent: September 29, 1981
    Assignee: Novametrix Medical Systems, Inc.
    Inventors: Luis A. Cabal, Carmelo Dali
  • Patent number: 4290431
    Abstract: An apparatus and method for measuring and monitoring blood oxygen content and local perfusion factor. A transcutaneous gas measurement probe is heated by application of an electric current to a semi-conductor device housed therein. The heat developed in a semi-conductor device heats the probe to a constant temperature under the control of a temperature monitoring and regulating circuit and the amount of power applied to the semi-conductor device is measured by multiplying the current conducted through the semiconductor device by the voltage across it to provide a measurement of local perfusion factor. An alerting device is provided to signal when blood oxygen content and local perfusion factor are outside a predetermined acceptable range.
    Type: Grant
    Filed: June 21, 1979
    Date of Patent: September 22, 1981
    Assignee: Novametrix Medical Systems, Inc.
    Inventors: Normand C. Herbert, Richard S. Burwen, Richard A. Mentelos
  • Patent number: 4280505
    Abstract: A fixation ring for a transcutaneous gas sensor probe adapted to be removably mounted on the probe with a bore in the ring communicating with the electrodes of the probe. The fixation ring includes a membrane mounted therein which is tensioned in cooperation with the probe when the fixation ring is attached to the probe at which time the membrane permits only gases to which it is permeable to pass through the bore in the fixation ring and into an ion solution in contact with the electrodes of the probe. A cap member removably mountable on the fixation ring is provided with a resilient disc for depressing the membrane to prevent excessive ion solution and any entrapped air from accumulating adjacent to the electrodes.
    Type: Grant
    Filed: June 20, 1979
    Date of Patent: July 28, 1981
    Assignee: Novametrix Medical Systems, Inc.
    Inventors: Carmelo Dali, David R. Rich