High frequency ventilator and method
First Claim
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1. An apparatus for supporting full ventilation in an air breathing animal comprising:
- means for supplying a respirating gas to an animal at elevated pressure,a linear motor,a diaphragm driven by said linear motor, andcircuit means for producing a high frequency, variable frequency, variable amplitude signal for driving said linear motor to drive said diaphragm to generate a pressure wave in said gas which is polar relative to the static pressure in an airway of said animal, said pressure wave having a positively sloped portion forcing gas into said airway and a negatively sloped portion drawing gas out of said airway.
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Abstract
A high frequency ventilator which generates a high frequency pressure wave in a supply of ventilating gas for supporting ventilation in air breathing animals. The high frequency pressure wave causes the ventilating gas to be exchanged and to diffuse through the animal'"'"'s lungs fast enough to support ventilation without spontaneous breathing on the part of the animal and without the aid of a separate ventilator.
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Citations
56 Claims
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1. An apparatus for supporting full ventilation in an air breathing animal comprising:
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means for supplying a respirating gas to an animal at elevated pressure, a linear motor, a diaphragm driven by said linear motor, and circuit means for producing a high frequency, variable frequency, variable amplitude signal for driving said linear motor to drive said diaphragm to generate a pressure wave in said gas which is polar relative to the static pressure in an airway of said animal, said pressure wave having a positively sloped portion forcing gas into said airway and a negatively sloped portion drawing gas out of said airway. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for ventilating an air breathing animal comprising:
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a source of ventilating gas; means for connecting an air breathing animal to said source of ventilating gas having means therein for elevating the static pressure in said connecting means; and means in fluid connection with said connecting means for producing a high frequency pressure wave having a selected amplitude and frequency comprising a diaphragm in contact with said gas, a linear motor having an armature connected to said diaphragm, and circuit means including an oscillator and shaping circuitry for producing a high frequency polar output signal for driving said linear motor, said pressure wave producing means being operable to produce a pressure wave in said gas to force the gas in said connecting means into said animal and to draw the gas in said connecting means out of said animal. - View Dependent Claims (9, 10, 11, 12)
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13. An apparatus for supporting full ventilation in an air breathing animal comprising:
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means for producing a high frequency pressure wave in a respirating gas comprising a linear motor for driving a diaphragm, means for driving said linear motor with a square wave signal to produce a pressure wave in the respirating gas having a selected frequency and amplitude which is polar relative to a static airway pressure in an air breathing animal to be ventilated, and means for connecting said pressure wave producing means to the air breathing animal to be ventilated, said pressure wave being operable to draw respirating gas from the air breathing animal; and means for maintaining a positive static pressure in said connecting means. - View Dependent Claims (14, 15, 16, 17, 18)
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19. An apparatus for ventilation of an air breathing animal comprising:
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means for producing a substantially continuous flow of gas; means for producing a square pressure wave of selected frequency and amplitude in said flow of gas for alternately exerting positive and negative pressure on said flow of gas; and means for connecting said pressure wave producing means to an air breathing animal including an exhaust for restricting said flow of gas to the atmosphere thereby maintaining an elevated static pressure in said connecting means, said pressure wave producing means being operable to cause the exchange of gas between said flow of gas and said air breathing animal. - View Dependent Claims (20, 21, 22, 23, 24)
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25. An apparatus for supporting full ventilation of an air breathing animal comprising:
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a signal generator for producing a square wave with a selected frequency and period; an amplifier for selectively varying the amplitude of said square wave; a polar converter for converting said amplified square wave to a polar amplified square wave; an airway tube; a substantially continuous flow of respirating gas through said airway tube; a diaphragm in contact with the gas in said airway tube; a linear motor for driving said diaphragm to alternately exert pressure against the gas in said airway tube in one direction and then exert pressure against the gas in said airway tube in the opposite direction in response to said polar amplified square wave so that the gas in said flow of respirating gas is exchanged with the gas in the lungs of an animal to be ventilated; and an exhaust for allowing the escape of gas from said airway tube to the atmosphere. - View Dependent Claims (26)
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27. A method of ventilating an air breathing animal comprising the steps of:
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supplying a flow of respirating gas to an air breathing animal to be ventilated at an elevated positive pressure; generating a polar pressure wave of selected amplitude and frequency to effect the exchange of the gas in the flow of respirating gas with the gas in the animal; and exhausting the flow of respirating gas to the atmosphere to ventilate the animal without the need for spontaneous breathing or additional ventilating devices. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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- 39. The method of ventilating an air breathing animal comprising supplying a substantially continuous flow of gas to an animal to be ventilated at elevated static pressure and alternately forcing gas into the animal and drawing gas out of the animal with a high frequency pressure wave in the flow of gas having a selected amplitude and frequency, said pressure wave having positively and negatively sloped portions whereby carbon dioxide from said animal and oxygen in the flow of gas are exchanged to ventilate the animal without the need for spontaneous breathing or additional ventilating devices.
Specification