Patents Assigned to Searle Cardio-Pulmonary Systems Inc.
  • Patent number: 4047844
    Abstract: A blood pumping system has a pair of integral flexible bodies each provided with an inlet and an outlet and disposed in open top cavities in a housing. The cavities have extensions holding inlet valves and outlet valves for opening and closing the inlets and outlets. A flexible diaphragm overlies the cavities and their extensions and is secured by a cover providing separate chambers over the inlet valves, the outlet valves and the bodies. Solenoid air valves are selectively energized to supply and exhaust the chambers to operate the valves and bodies. Switches responsive to the full and empty positions of the bodies govern the energization of the solenoids through control circuitry including a voltage controlled oscillator, a device for changing the frequency of the oscillator in accordance with the time of operation of at least some of the switches, and a device for ensuring at least a minimum rate of operation of the switches.
    Type: Grant
    Filed: December 8, 1975
    Date of Patent: September 13, 1977
    Assignee: Searle Cardio-Pulmonary Systems Inc.
    Inventor: Thomas C. Robinson
  • Patent number: 3996010
    Abstract: A breathing gas analyzer, especially for pulmonary use, has a frame supporting a centrally mounted radiation or analyzing chamber of about 1 and one-half to 25 millimeters (0.06 to 1.0 inches) substantially uniform inside diameter, having a circular-cylindrical transparent wall with closed ends connected in an electrical circuit and providing an anode of brass or stainless steel and a cathode of tantalum and constituting a discharge tube. Leading from a patient's breathing tube is a conduit passing axially through the cathode, the conduit having an inside diameter of about 0.03 to 0.25 inches (0.7 to 6.4 millimeters). The chamber is subjected to subatmospheric pressure of about 0.2 to 10.0 torr through a duct from about one thirty-second to one-quarter inches (0.8 to 6.4 millimeters) inside diameter, passing through the anode to a vacuum pump. Arrayed equidistantly from the axis and around the chamber are one or more radiation detection devices positioned opposite the negative glow region of the discharge.
    Type: Grant
    Filed: March 25, 1976
    Date of Patent: December 7, 1976
    Assignee: Searle Cardio-Pulmonary Systems Inc.
    Inventor: Robert B. Fraser
  • Patent number: 3993050
    Abstract: A spirometer has a housing with a wall having an opening therein. A bag made up of a first, stiff sheet and a second, flexible sheet having an exhaust slit therein as well as an inlet tube is supported within the housing with the first sheet lying against the wall and with the inlet tube extending through the opening. A valve flap within the bag overlies the inlet tube and a valve bar in the housing is spring urged with a selected force to press the bag, between the slit and the tube, against the wall. A primary plate is hinged to the housing at its top to lie against the second sheet. A secondary plate is similarly hinged and is power controlled to be spaced from or to press against the primary plate through an intervening cushion. The position of the primary plate is indicated mechanically and also by electrical instrumentation.
    Type: Grant
    Filed: May 19, 1975
    Date of Patent: November 23, 1976
    Assignee: Searle Cardio-Pulmonary Systems Inc.
    Inventors: Thomas C. Robinson, Sotiris Kitrilakis
  • Patent number: 3985131
    Abstract: A volume ventilating respirator, especially for infant and pediatric use, has a pair of different size volume chambers with means for selecting one or the other for specific use. There is a selector affording a choice of several different ventilating modes including deep breaths at chosen periods or events. The operation is generally automatic with response to patient effort, if desired, and has some responses to manual signals; i.e. deep breath and inspiration. The operation is electric with pneumatic and electronic controls and logic and numerous event indicators and alarms.
    Type: Grant
    Filed: November 20, 1974
    Date of Patent: October 12, 1976
    Assignee: Searle Cardio-Pulmonary Systems Inc.
    Inventors: Keith E. Buck, Sotiris Kitrilakis, Thomas C. Robinson
  • Patent number: 3982095
    Abstract: A respiratory humidifier has a base with a thermally controlled heater therein effective to heat a first transfer surface on the top of the base. Removably pressed against the first transfer surface is a second transfer surface forming the bottom of a container into which liquid is admitted, close to the bottom, by a float valve to establish a liquid level. Gas is admitted to the container below the liquid level through an inlet tube and is released from the container above the liquid level through an outlet tube. A porous pad in the container is in the gas flow path between the inlet tube and the outlet tube to provide extended, wettable surface. A float blocks the entrance to the outlet tube when the liquid level rises unduly and a normally closed shunt passage between the inlet tube and the outlet tube opens by differential pressure when the entrance to the outlet tube is blocked.
    Type: Grant
    Filed: October 4, 1973
    Date of Patent: September 21, 1976
    Assignee: Searle Cardio-Pulmonary Systems Inc.
    Inventor: Thomas C. Robinson
  • Patent number: 3951607
    Abstract: A gas analyzer especially for pulmonary use has a frame supporting a centrally mounted radiation chamber of about 10 to 30 millimeters (0.4 to 1.2 inches) substantially uniform inside diameter, having a circular-cylindrical glass wall closed by molybdenum protected aluminum ends connected in an electrical circuit to constitute an anode and a cathode. Leading from a patient's breathing tube is a conduit passing through a regulating valve and axially through the cathode, the conduit having an inside diameter of about 0.060 inches. The chamber is subjected to subatmospheric pressure through a duct of from about one-eighth to one-quarter inches inside diameter, passing through the anode to a vacuum pump. Arrayed equidistantly from the axis and around the chamber are several radiation detection devices, each connected to a display device. There are individual filters interposed between the chamber and at least some of the detecting devices.
    Type: Grant
    Filed: November 29, 1974
    Date of Patent: April 20, 1976
    Assignee: Searle Cardio-Pulmonary Systems Inc.
    Inventor: Robert B. Fraser
  • Patent number: 3951143
    Abstract: A volume ventilator effective to give a patient successive inhalations and exhalations at timed intervals is responsive to the patient's effort to inhale and at selected times gives the patient a deep breath synchronized with the patient's effort to inhale.
    Type: Grant
    Filed: November 20, 1974
    Date of Patent: April 20, 1976
    Assignee: Searle Cardio-Pulmonary Systems Inc.
    Inventors: Sotiris Kitrilakis, Thomas C. Robinson