Life support simulation system simulating human physiological parameters

• US 6,273,728 B1
• Filed: 09/04/1997
• Issued: 08/14/2001
• Est. Priority Date: 09/04/1997
• Status: Expired due to Term

• Current Assignee: University of Florida (State University System of Florida)
• Original Assignee: University of Florida (State University System of Florida)
• Inventors: Ellis, Michael Franklin, Good, Michael Lowell, de Beer, Nicole Anna Marie, Euliano, Tammy Yachabach, McClure, Mark Woodson, Carovano, Ronald George Jr., Gravenstein, Joachim Stefan, Beneken, Joannes E. W., Azukas, James Bradley, van Meurs, Willem Lambertus, Lampotang, Samsun
• Primary Examiner(s): Rimell, Sam
• Application Number:
  US08/923,807
• Time in Patent Office: 1,440 Days
• Field of Search: 434/262, 434/266, 434/267, 434/268, 434/272
• US Class Current: 434/268
• CPC Class Codes: G09B 23/28 for medicine

Abstract

Method and apparatuses for simulating life support procedures in real-time using a mannequin. The apparatuses and methods are operable for a number of therapeutic interventions and provide for a number of appropriate simulated physiological and pharmacological responses. Included interventions are chest displacement, the application of gas pressure to the upper airway, inspiratory gas composition, administration of a fluid, or administration of intravenous drugs. These interventions provide a variety of appropriate responses (and misapplication of an intervention by a trainee provides a corresponding appropriate response).

Claims

1. A method for simulating life support procedures in real-time using a mannequin having at least an abdomen and a thorax, the method comprising:

a) sensing displacement of at least one of the thorax or the abdomen of the mannequin and generating a displacement signal corresponding to an extent of the displacement;

b) determining, using a model-driven simulator, a physiological blood flow corresponding to blood flow through a human heart in response to the displacement signal; and

c) actuating at least one output based on the determined physiological blood flow.

2. The method of claim 1, wherein the model-driven simulator comprises at least one of a mechanical model, a mathematical model, a combination of a mathematical model and a mechanical model.

3. The method of claim 2, wherein the model-driven simulator further comprises at least one of a time driven script, an event driven script, and a combination of a time driven script and an event driven script.

4. The method of claim 2, wherein determining the physiological blood flow further comprises accounting for elastic characteristics of at least one of a sternum, a rib-cage, a diaphragm, or an abdomen.

5. The method of claim 1, further comprising computing an intrathoracic pressure from the displacement signal, and wherein the computed intrathoracic pressure is used to determine the physiological blood flow.

6. The method of claim 5, further comprising supplying a lung volume and a simulated respiratory muscle pressure, wherein the intrathoracic pressure is computed from at least one of the displacement signal, the lung volume, and the simulated respiratory muscle pressure.

7. The method of claim 6, wherein the lung volume is simulated.

8. The method of claim 1, further comprising deriving, in response to the displacement signal, at least one physiological variable selected from the group comprising:

a simulated electrocardiogram, a simulated heart sound, a simulated cardiac output signal, a simulated gas pressure and flow in and out of a trachea of the mannequin, a simulated breath sound, a simulated end-tidal CO₂, a simulated oxyhemoglobin saturation, a simulated arterial gases, a simulated venous blood gases, a simulated skin color, a simulated thumb twitch, a simulated electroencephalogram, and a simulated eye sign.

9. The method of claim 1, further comprising determining, in response to the determined physiological blood flow, at least one physiological variable selected from the group comprising:

a simulated electrocardiogram, a simulated heart sound, a simulated cardiac output, a simulated end-tidal CO2, a simulated oxyhemoglobin saturation, a simulated arterial blood gas, a simulated venous blood gas, a simulated skin color, a simulated thumb twitch, a simulated electroencephalogram, and a simulated eye sign.

10. The method of claim 1, further comprising deriving, in response to the displacement signal, a simulated palpable pulse, wherein the simulated palable pulse is generated only if arterial pressure levels exceed a predetermined threshold.

11. The method of claim 10, wherein the simulated palpable pulse is at least one of a simulated carotid pulse, a simulated femoral pulse, and a simulated radial pulse.

12. The method of claim 1, further comprising deriving, in response to the determined physiological blood flow, a simulated intravascular blood pressure.

13. The method of claim 12, wherein the simulated intravascular blood pressure is at least one of the intravascular blood pressures selected from the group comprising:

simulated intrathoracic arterial, extrathoracic arterial, vessel rich, muscle, skin, fat, extrathoracic venous, intrathoracic venous, right atrial, right ventricular, pulmonary arterial, lung tissue, pulmonary venous, left atrial, and left ventricular blood pressures.

14. The method of claim 1, further comprising determining, in response to the determined physiological blood flow, a simulated palpable pulse, wherein the simulated palpable pulse is generated only if arterial pressure levels exceed a predetermined threshold.

15. The method of claim 14, wherein the simulated palpable pulse is at least one of a simulated carotid pulse, a simulated femoral pulse, and a simulated radial pulse.