Constant flow and controlled ventilation, pressure responsive pulmotor

• US 5,097,424 A
• Filed: 03/18/1991
• Issued: 03/17/1992
• Est. Priority Date: 12/31/1986
• Status: Expired due to Fees

• Current Assignee: Elmed Genevri SRL
• Original Assignee: Elmed Genevri SRL
• Inventors: Moretti, Corrado, Ginevri, Giorgio
• Primary Examiner(s): Teska, Kevin J.
• Application Number:
  US07/672,000
• Time in Patent Office: 365 Days
• Field of Search: 364/413.01, 364/413.02, 364/413.03, 364/510, 364/550, 128/204.11, 128/204.14, 128/204.17, 128/204.23, 128/204.24, 128/204.25, 128/204.26, 128/716
• US Class Current: 128/204.23
• CPC Class Codes: A61M 16/0051 with alarm devices
• CPC Class Codes: A61M 16/024 including calculation means, e.g. using a processor
• CPC Class Codes: A61M 16/0808 Condensation traps
• CPC Class Codes: A61M 16/109 the humidifying liquid or the beneficial agent
• CPC Class Codes: A61M 16/12 by mixing different gases
• CPC Class Codes: A61M 2016/0027 pressure meter
• CPC Class Codes: A61M 2205/502 User interfaces, e.g. screens or keyboards
• CPC Class Codes: A61M 2205/581 by audible feedback
• CPC Class Codes: A61M 2230/06 Heartbeat rate only

Abstract

A constant flow and controlled-ventilation pulmotor responsive to the respiration pressure in the respiratory circuit of a patient in which the intervention of a processor causes visually observable information to be presented to the operator to allow immediate control of mechanical ventilation and the adaptation of same to the clinical requirements of the patient. First, second and third desired pressure, time and flow rate parameters are set by a control board. A maximum pressure-responsive valve is responsive to the first pressure, time, and flow rate parameters, a minimum pressure-responsive valve is responsive to the second pressure, time, and flow rate parameters, and a solenoid valve is responsive to third pressure, time, and flow rate parameters. A transducer continuously detects in real time the value of the instantaneous pressure in the respiratory circuit of the patent and supplies an electrical signal indicative thereof to the processor. The processor processes the signals from the transducer and the control board and respectively visualizes them on a video display as breathing waveforms and as numerals representative of the first, second, and third sets of parameters.

Claims

1. A constant flow and controlled-ventilation pulmotor for use with a patient having a respiratory circuit having an instantaneous pressure, the pulmotor being responsive to the instantaneous pressure in the respiratory circuit of the patient, the pulmotor comprising:

mixing means for proportioning amounts of air and oxygen in a desired ratio for an air and oxygen mixture, the mixture having a flow rate;

regulation means for receiving the air and oxygen mixture from said mixing means and regulating the flow rate of the mixture;

a ventilation conduit having first and second ends, said first end thereof being connected with said regulation means for supplying the air and oxygen mixture to said ventilation conduit;

a connector connected to said second end of said ventilation conduit;

a maximum pressure-responsive valve responsive to first pressure, time, and flow rate parameters, said maximum pressure-responsive valve being arranged on said ventilation conduit;

a minimum pressure-responsive valve responsive to second pressure, time and flow rate parameters;

an expiration conduit having first and second ends, said first end thereof being connected to said connector and said second end thereof being connected with said minimum pressure-responsive valve;

a pinchcock solenoid valve responsive to third pressure, time, and flow rate parameters, said pinchcock solenoid valve being arranged on said expiration conduit;

a transducer conduit having first and second ends, said first end thereof being connected to said connector;

transducer means connected to said second end of said transducer conduit for continuously detecting in real time a value of instantaneous respiration pressure of the patient and supplying an electrical signal indicative thereof;

control board means for setting the desired air to oxygen ratio of said mixing means and for setting desired values of the first, second, and third pressure, time, and flow rate parameters to which said maximum and minimum pressure-responsive valves and said pinchcock solenoid valve are respectively responsive, said control board means being connected to said mixing means, said regulation means, said minimum and maximum pressure-responsive valves, and said pinchcock solenoid valve, and said control board means generating signals representing the desired air to oxygen ratio of said mixing means and the desired first, second, and third pressure, time and flow rate parameters to which said maximum and minimum pressure-responsive valves and said pinchcock solenoid valve are respectively responsive;

electronic processor means for processing the signals from said transducer means for visualization on a video display means as a respiration waveform and for processing the signals from said control board means for visualization on the video display means as numerals; and

the video display means, for continuously visualizing in the form of respiration waveforms the signals from said transducer means and for continuously visualizing in the form of numerals the signals from said control board means, whereby a person operating said pulmotor can continuously monitor the respiration waveforms of the patient and modify as necessary the parameters set on said control board means in dependence on the respiration waveforms.

2. The pulmotor of claim 1, said control board means including:

first and second control means for controlling the proportion of oxygen in the air and oxygen mixture and for regulating the flow rate of the mixture;

third and fourth control means for setting minimum and maximum values of inhalation pressure and exhalation pressure, respectively, for regulating said minimum and maximum pressure-responsive valves and said solenoid valve;

fifth and sixth control means for setting inhalation and expiration times;

seventh and eighth control means for setting alarm values for maximum and minimum values of air pressure and oxygen pressure, respectively; and

a plurality of key means for activating and deactivating the respiration waveforms and the numerals on said video display means.