High-frequency fan ventilator

• US 5,611,335 A
• Filed: 06/06/1995
• Issued: 03/18/1997
• Est. Priority Date: 06/06/1995
• Status: Expired due to Fees

• Current Assignee: Imad R. Makhoul, Saleem N. Geriys
• Original Assignee: Imad R. Makhoul, Saleem N. Geriys
• Inventors: Makhoul, Imad R., Geriys, Saleem N.
• Primary Examiner(s): Lewis, Aaron J.
• Assistant Examiner(s): SRIVASTAVA, VIRENDRA KUMAR
• Application Number:
  US08/471,246
• Time in Patent Office: 651 Days
• Field of Search: 128/200.21, 128/202.13, 128/203.16, 128/203.24, 128/204.13, 128/204.14, 128/204.18, 128/204.24, 128/205.19, 128/204.21 , 128/204.22, 128/204.25, 128/205.23, 128/911
• US Class Current: 128/204.24
• CPC Class Codes: A61M 16/0066 Blowers or centrifugal pumps
• CPC Class Codes: A61M 16/0096 High frequency jet ventilation
• CPC Class Codes: A61M 16/024 including calculation means, e.g. using a processor
• CPC Class Codes: A61M 16/0841 for sampling
• CPC Class Codes: A61M 16/0858 Pressure sampling ports
• CPC Class Codes: A61M 16/161 with means for measuring the humidity
• CPC Class Codes: A61M 2205/3368 Temperature
• CPC Class Codes: Y10S 128/911 Unilimb inhalation-exhalation breathing tubes

Abstract

A high-frequency fan ventilator having a rotating fan fixed via its central shaft to the base of a ventilator chamber. The chamber has separate openings for incoming pressurized air/oxygen and other openings for expelling exhaled gas rich with carbon dioxide originating from the lungs. Using the high-frequency fan ventilator, gas exchange between the lungs and the atmosphere is achieved by rotation of the fan. This rotation creates a negative pressure zone around the fan'"'"'s center and leads to helical gas waves moving towards the fan'"'"'s center (away from the lungs), simulating expiration of gas from the lungs. The rotation of the fan'"'"'s arms also produces helical gas waves directed from the fan, to the periphery of the chamber and towards the lungs through the connector of the ventilation chamber and the endotracheal tube, which is inserted into the trachea, simulating inspiration of gas into the lungs. Adequate lung inflation is maintained by keeping a pre-set level of positive pressure within the system achieved by intermittent obstruction of the exhalation openings in the ventilation chamber'"'"'s wall. Monitoring devices are coupled to the chamber to monitor and measure the temperature, humidity and pressure within the chamber.

Claims

1. A ventilator, comprising:

a ventilation chamber having containment walls, a base and a ventilation port for directing gases to and from a patient;

a fan, disposed at the base of the ventilation chamber, the fan having a shaft for holding fan arms, the shaft of the fan having a lumen through the length thereof, the lumen connecting the inside of the ventilation chamber to outside air and providing a port for exhaled gases; and

a fan rotator, coupled to the fan, for rotating the fan at a selectable velocity, the rotation of the fan providing positive and negative helical waves for inspiration and expiration.

2. The ventilator of claim 1 wherein the positive helical waves in the peripheral portion of the chamber move away from the fan towards the ventilation port for active inspiration of gas to the lungs.

3. The ventilator of claim 1 wherein the negative helical waves move towards the center of the chamber from the ventilation port to the shaft of the fan for active expiration of gas from the lungs.

4. The ventilator of claim 1 wherein the chamber collects inspiration gases through inlet ports prior to inspiration and discharges expiration gases through exit ports after expiration.

5. The ventilator of claim 4 wherein the ventilation chamber mixes the inspiration gases prior to directing the ventilation gases out the ventilation port.

6. The ventilator of claim 1 wherein the chamber has a narrowing neck leading to the ventilation port for directing gas flow to and from the patient.

7. The ventilator of claim 1 wherein the base of the ventilation chamber having the rotating fan disposed thereto obstructs gas flow from the fan in the direction of this base.

8. The ventilator of claim 1 wherein the arms of the fan are perpendicular to the chamber'"'"'s base.

9. The ventilator of claim 1 wherein the number of arms for the fan and the dimensions of each arm are chosen to produce a predetermined amplitude for the helical waves generated by the fan.

10. The ventilator of claim 1 wherein the velocity of fan is variable.

11. The ventilator of claim 1 wherein the lumen of the fan'"'"'s shaft is capable of being selectably opened and closed.

12. The ventilator of claim 1 wherein the chamber further comprises a first set of apertures in the wall of the chamber for movement of gas from inside the chamber to outside the chamber to the outside air.

13. The ventilator of claim 12 wherein the size of the apertures are selectably and intermittently controlled to maintain a positive pressure in the ventilation chamber thereby sustaining lung inflation.

14. The ventilator of claim 1 wherein the chamber further comprises a second set of apertures in the wall of the chamber introducing gas enriched with pressurized air and oxygen into the ventilation chamber.

15. The ventilator of claim 1 wherein the chamber further comprises a pop-off valve which for preventing the pressure inside the ventilation chamber from exceeding a pre-set value.

16. The ventilator of claim 1 further comprising measurement and monitoring means, coupled to the chamber, for monitoring environmental characteristics inside the ventilation chamber.

17. The ventilator of claim 16 wherein the measuring and monitoring means further comprises display means for displaying the environmental characteristics inside the ventilation chamber.

18. The ventilator of claim 16 wherein the measurement and monitoring means is controlled by a computer.

19. The ventilator of claim 16 wherein the environmental characteristics monitored and measured are temperature, humidity and air pressure.

20. The ventilator of claim 1 wherein the chamber further comprises a water trap for draining fluid from the chamber.

22. The ventilator of claim 1 wherein the positive helical waves in the peripheral portion of the chamber move away from the fan towards the ventilation port for active inspiration of gas to the lungs.

23. The ventilator of claim 1 wherein the negative helical waves move towards the center of the chamber from the ventilation port to the shaft of the fan for active expiration of gas from the lungs.

21. A high-frequency fan ventilator, comprising:

a ventilation chamber having containment walls, a base and a ventilation port for directing gases to and from a patient;

a fan, disposed at the base of the ventilation chamber, the fan having a shaft for holding fan arms, the shaft of the fan having a lumen through the length thereof, the lumen connecting the inside of the ventilation chamber to outside air and providing a port for exhaled gases;

a variable, high-speed fan rotator, coupled to the fan, for rotating the fan at a selectable velocity, the rotation of the fan providing positive and negative helical waves for inspiration and expiration; and

measurement and monitoring means, coupled to the chamber, for monitoring environmental characteristics inside the ventilation chamber.

24. The ventilator of claim 21 wherein the chamber collects inspiration gases through inlet ports prior to inspiration and discharging expiration gases through a exit port after expiration.

25. The ventilator of claim 24 wherein the ventilation chamber mixes the inspiration gases prior to directing the ventilation gases out the ventilation port.

26. The ventilator of claim 21 wherein the chamber has a narrowing neck leading to the ventilation port for directing gas flow to and from the patient.

27. The ventilator of claim 21 wherein the base of the ventilation chamber having the rotating fan disposed thereto obstructs gas flow from the fan in the direction of this base to create the positive and negative helical waves.

28. The ventilator of claim 21 wherein the arms of the fan are perpendicular to the chamber'"'"'s base.

29. The ventilator of claim 21 wherein the number of arms for the fan and the dimensions of each arm are chosen to produce a predetermined amplitude for the helical waves generated by the fan.

30. The ventilator of claim 21 wherein the lumen is capable of being selectably opened and closed.

31. The ventilator of claim 21 wherein the chamber further comprises a first set of apertures in the wall of the chamber for movement of gas from inside the chamber to outside the chamber to the outside air.

32. The ventilator of claim 31 wherein the size of the apertures are selectably and intermittently controlled to maintain a positive pressure in the ventilation chamber thereby sustaining lung inflation.

33. The ventilator of claim 21 wherein the chamber further comprises a second set of apertures in the wall of the chamber introducing gas enriched with pressurized air and oxygen into the ventilation chamber.

34. The ventilator of claim 21 wherein the chamber further comprises a pop-off valve which for preventing the pressure inside the ventilation chamber from exceeding a pre-set value.

35. The ventilator of claim 21 wherein the measureing and monitoring means further comprises display means for displaying the environmental characteristics inside the ventilation chamber.

36. The ventilator of claim 21 wherein the measurement and monitoring means is controlled by a computer.

37. The ventilator of claim 21 wherein the environmental characteristics monitored and measured are temperature, humidity and air pressure.

38. The ventilator of claim 21 wherein the chamber further comprises a water trap for draining fluid from the chamber.