A double-ended variable speed blower for Continuous Positive Airway Pressure (CPAP) ventilation of patients includes two impellers in the gas flow path that cooperatively pressurize gas to desired pressure and flow characteristics. Thus, the double-ended blower can provide faster pressure response a
A double-ended variable speed blower for Continuous Positive Airway Pressure (CPAP) ventilation of patients includes two impellers in the gas flow path that cooperatively pressurize gas to desired pressure and flow characteristics. Thus, the double-ended blower can provide faster pressure response and desired flow characteristics over a narrower range of motor speeds, resulting in greater reliability and less acoustic noise.
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1. A CPAP/NIPPV apparatus for delivering breathable gas to a human patient including a double-ended blower comprising: a motor supporting first and second shaft ends extending from opposite ends of the motor;a first impeller attached to the first shaft end, the first impeller having a first air inta
1. A CPAP/NIPPV apparatus for delivering breathable gas to a human patient including a double-ended blower comprising: a motor supporting first and second shaft ends extending from opposite ends of the motor;a first impeller attached to the first shaft end, the first impeller having a first air intake and a first volute;a second impeller attached to the second shaft end, the second impeller having a second air intake and a second volute; anda casing to support and enclose the motor thereby enabling establishment of an air flow channel within the casing and surrounding the motor to guide air along an air path from the first impeller to the second impeller, wherein the air flow channel is constructed and arranged so that at least part of the air path between the first and second volutes is helical, said casing formed with an outlet downstream of the second impeller. 2. A CPAP/NIPPV apparatus as claimed in claim 1, wherein the casing includes first and second halves bisected along a plane parallel to an axis extending along said first and second shaft ends, said first and second halves being fastened to one another. 3. A CPAP/NIPPV apparatus as claimed in claim 1, further comprising a damping sleeve provided to the casing. 4. A CPAP/NIPPV apparatus as claimed in claim 3, wherein the damping sleeve includes separable first and second halves that define in part the air flow channel radially between the motor and the damping sleeve when combined. 5. A CPAP/NIPPV apparatus as claimed in claim 3, wherein the damping sleeve is made of at least one of silicone, foam, rubber and polyurethane. 6. A CPAP/NIPPV apparatus as claimed in claim 1, wherein the second air intake is positioned between the first and second impellers. 7. A CPAP/NIPPV apparatus as claimed in claim 1, wherein each impeller has scalloped edges. 8. A CPAP/NIPPV apparatus as claimed in claim 1, wherein the first impeller is configured for rotation within the first volute defined adjacent a first end of the casing. 9. A CPAP/NPPV apparatus as claimed in claim 8, wherein a first endcap and a portion of a motor stator of the motor define the first volute. 10. A CPAP/NIPPV apparatus as claimed in claim 1, further comprising a first endcap adjacent the first impeller and a second endcap adjacent the second impeller, wherein said air flow channel is defined between the first and second endcaps. 11. A CPAP/NIPPV apparatus as claimed in claim 10, wherein the first endcap includes the first air intake leading to the first impeller. 12. A CPAP/NIPPV apparatus as claimed in claim 4, wherein the casing includes an outlet to direct the gas along a path that is substantially tangential to the second impeller. 13. A CPAP/NIPPV apparatus as claimed in claim 1, wherein the second impeller is configured for rotation within the second volute defined adjacent a second end of the casing. 14. A CPAP/NIPPV apparatus as claimed in claim 13, wherein the second volute is defined between a contoured plate provided to a stator of the motor and an inside surface of a second end cap, the contoured plate including the second air intake. 15. A CPAP/NIPPV apparatus as claimed in claim 1, wherein the casing is made of aluminum. 16. A CPAP/NIPPV apparatus as claimed in claim 1, wherein the first and second shaft ends are provided as part of a common shaft. 17. A CPAP/NIPPV apparatus as claimed in claim 1, wherein both impellers are configured for rotation in the same direction. 18. A CPAP/NIPPV apparatus as claimed in claim 1, wherein the first and second impellers are configured for rotation in opposite directions. 19. A CPAP/NIPPV apparatus as claimed in claim 1, wherein the first and second impellers have blades configured to direct the air in a common direction. 20. A CPAP/NIPPV apparatus including a double-ended blower comprising: a motor supporting opposed first and second shaft ends;a first impeller provided to the first shaft end, the first impeller having a first air intake;a second impeller provided to the second shaft end, the second impeller having a second air intake; anda casing to support and enclose the motor thereby enabling establishment of an air path radially between the motor and the casing to guide air from the first impeller to the second impeller, wherein the air path includes a first path portion adjacent the first impeller with a spiral component, a second path portion between the first and second impellers with a helical component, and a third path portion adjacent the second impeller with a spiral component and a radial component, and wherein the CPAP/NIPPV apparatus is pre-set to deliver inspiratory positive airway pressure (IPAP) during the inspiratory phase of the patient's breathing cycle, and to deliver expiratory positive airway pressure (EPAP) during the expiration phase of the patient's respiratory cycle. 21. A CPAP/NIPPV apparatus as claimed in claim 20, wherein the first and second impellers have blades configured to direct the air in opposite directions. 22. A CPAP/NIPPV apparatus as claimed in claim 20, further comprising a patient interface. 23. A CPAP/NIPPV apparatus as claimed in claim 20, wherein the IPAP is greater than the EPAP. 24. A CPAP/NIPPV apparatus as claimed in claim 20, wherein the blower is configured to generate pressures in the range of about 4 cm H2O to 28 cm H2O at flow rates of up to of about 180 L/min as measured at the patient interface. 25. A Continuous Positive Airway Pressure/Noninvasive Positive Pressure Ventilation (CPAP/NIPPV) apparatus for treatment of a patient with a sleeping disorder, the apparatus including: a gas flow path between a gas inlet and a gas outlet;a motor;an impeller assembly, the impeller assembly including a shaft in communication with said motor for rotational motion about a first axis; andfirst and second impellers fixedly secured to said shaft;wherein said first and second impellers are placed in fluid communication with one another by said gas flow path such that both impellers are disposed between said gas inlet and said gas outlet to cooperatively pressurize gas flowing from said gas inlet to said gas outlet; andan elastomeric sleeve disposed around the first and second impellers and the motor and defining a portion of the gas path that extends radially between the motor and the elastomeric sleeve from the first impeller to the second impeller. 26. A CPAP/NIPPV apparatus of claim 25, wherein said first and second impellers are disposed at opposite ends, respectively, of said motor. 27. A CPAP/NIPPV apparatus as claimed in claim 25, wherein an internal surface of the elastomeric sleeve is formed adjacent a motor stator of the motor so as to define the gas path between the motor stator and the internal surface. 28. A CPAP/NIPPV apparatus as claimed in claim 25, further comprising a housing provided to and surrounding the sleeve. 29. A CPAP/NIPPV apparatus as claimed in claim 28, wherein the sleeve and/or housing comprises first and second halves. 30. A CPAP/NIPPV apparatus of claim 29, wherein the first and second halves of the sleeve are bisected in a plane parallel to the axis of the shaft. 31. A CPAP/NIPPV apparatus as claimed in claim 28, wherein the housing is made of aluminum. 32. A CPAP/NIPPV apparatus as claimed in claim 25, wherein the sleeve is made of silicone, foam, rubber and/or polyurethane. 33. A CPAP/NIPPV apparatus as claimed in claim 25, wherein the gas path is defined in part by a helical path from the first impeller to the second impeller. 34. A CPAP/NIPPV apparatus as claimed in claim 25, further comprising an endcap adjacent the first impeller, wherein the endcap includes an intake for the first impeller in the form of a central inlet aperture. 35. A CPAP/NIPPV apparatus as claimed in claim 34, wherein the endcap and a portion of a motor stator of the motor define a volute for the first impeller. 36. A CPAP/NIPPV apparatus as claimed in claim 25, further comprising a patient interface, such as a mask. 37. A CPAP/NIPPV apparatus as claimed in claim 25, wherein the CPAP/NIPPV apparatus is pre-set to deliver inspiratory positive airway pressure (IPAP) during the inspiratory phase of the patient's breathing cycle, and to delivery expiratory positive airway pressure (EPAP) during the expiration of the patient's respiratory cycle. 38. A CPAP/NIPPV apparatus as claimed in claim 37, wherein the IPAP is greater than the EPAP. 39. A CPAP/NIPPV apparatus as claimed in claim 25, wherein the blower is configured to generate pressures in the range of about 4 cm H2O to 28 cm H2O at flow rates of up to about 180 L/min as measured at a patient interface. 40. A CPAP/NIPPV apparatus as claimed in claim 25, wherein each impeller comprises scalloped edges. 41. A CPAP/NIPPV apparatus as claimed in claim 25, wherein said portion of the gas path that extends between the first and second impellers is at least partially helical. 42. A CPAP/NIPPV apparatus of claim 25, wherein sleeve extends from an inlet of the first impeller to an intake of the second impeller. 43. A CPAP/NIPPV apparatus for treatment of a patient with a sleeping disorder, including the blower as claimed in claim 1.
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