Humidifier with structure to prevent backflow of liquid through the humidifier inlet
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F23D-011/00
F23D-014/00
A61M-015/00
출원번호
US-0100783
(2011-05-04)
등록번호
US-RE44453
(2013-08-27)
우선권정보
AU-PR3117 (2001-02-16); AU-PR7288 (2001-08-27)
발명자
/ 주소
Virr, Alexander
Smith, Ian Malcolm
Lithgow, Perry David
Jones, Richard Llewelyn
Cheung, Andrew
출원인 / 주소
ResMed Limited
대리인 / 주소
Nixon & Vanderhye, PC
인용정보
피인용 횟수 :
27인용 특허 :
133
초록▼
A humidifier includes a base configured to retain a body of liquid therein, a top cover, and a seal disposed between the top cover and the base. At least a portion of the base is constructed of a heat conducting material. The top cover defines both an inlet and an outlet communicated with an interio
A humidifier includes a base configured to retain a body of liquid therein, a top cover, and a seal disposed between the top cover and the base. At least a portion of the base is constructed of a heat conducting material. The top cover defines both an inlet and an outlet communicated with an interior of the base. The inlet is configured to receive pressurized breathable gas and the outlet is configured to deliver the pressurized breathable gas with added humidity.
대표청구항▼
1. A humidifier assembly for a CPAP apparatus, comprising a humidifier including a base configured to retain a body of liquid therein, at least a portion of the base being constructed of a heat conducting material,a top cover, anda seal disposed between the top cover and the base; anda connecting st
1. A humidifier assembly for a CPAP apparatus, comprising a humidifier including a base configured to retain a body of liquid therein, at least a portion of the base being constructed of a heat conducting material,a top cover, anda seal disposed between the top cover and the base; anda connecting structure configured to connect between the CPAP apparatus and humidifier and allow communication of an outlet of the CPAP apparatus with thean inlet of the humidifier, the connecting structure including a housing providing a base portion to support the humidifier thereon, anda retaining mechanism configured to secure the connecting structure to the CPAP apparatus,wherein the base portion includes a heating element in contact with the heat conducting material of the base of the humidifier. 2. A humidifier assembly according to claim 1, wherein the top cover defines both an inlet and an outlet communicated with an interior of the base, the inlet configured to receive pressurized breathable gas and the outlet configured to deliver the pressurized breathable gas with added humidity. 3. A humidifier assembly according to claim 1, wherein the connecting structure includes a control knob to control a heat setting of the heating element. 4. A humidifier assembly according to claim 1, wherein the connecting structure includes contact elements that communicate with a power supply within the CPAP apparatus. 5. A humidifier assembly according to claim 1, wherein the connecting structure is configured to allow removable attachment of the CPAP apparatus to the humidifier. 6. A humidifier assembly according to claim 1, wherein the heat conducting material is a metallic material. 7. A CPAP apparatus including a humidifier assembly according to claim 1. 8. A humidifier assembly according to claim 1, wherein the inlet of the humidifier is provided in the base and an outlet of the humidifier is provided in the top cover. 9. A humidifier for humidifying a flow of breathable gas to be delivered to a patient, the humidifier comprising: a humidifier body configured to retain a body of liquid having a predetermined maximum volume, the humidifier body comprising:a first chamber having a first chamber inlet configured to receive the flow of breathable gas, anda second chamber in communication with the first chamber through a passage, the second chamber being structured to contain a predetermined maximum volume of liquid when the humidifier body is in a normal upright, operating position, the second chamber comprising a second chamber outlet configured to deliver the flow of breathable gas with added humidity,wherein the first chamber, the second chamber, and the passage are arranged such that when liquid is contained in the second chamber in the upright, normal operating position, the possibility of liquid flowing from the second chamber through the passage is reduced or prevented, and liquid that flows from the second chamber and through the passage is collected in the first chamber such that liquid is discouraged or prevented from spilling back from the first chamber inlet when the humidifier body is inadvertently rotated from the upright, normal operating position to a non-upright position. 10. A humidifier according to claim 9, wherein the humidifier body has a longitudinal axis extending in a direction from a rear side of the humidifier body to a front side of the humidifier body, and a transverse axis extending in a direction from a left side of the humidifier body to a right side of the humidifier body, and no liquid will flow out of the first chamber inlet when the humidifier body is rotated about 80°-110° around the longitudinal axis and/or transverse axis from the upright, normal operating position. 11. A humidifier according to claim 10, wherein the second chamber outlet is higher than the first chamber inlet in the upright, normal operating position. 12. A humidifier according to claim 11, wherein the second chamber has a larger volume than the first chamber. 13. A humidifier according to claim 12, wherein the passage is forward of and to the side of the first chamber inlet. 14. A humidifier according to claim 13, wherein the first chamber inlet is positioned on a transverse side of the humidifier body. 15. A humidifier according to claim 14, wherein the first chamber inlet is positioned on a rearward end of the transverse side of the humidifier body. 16. A humidifier according to claim 14, wherein the first chamber inlet is positioned on the left side of the humidifier body. 17. A humidifier according to claim 14, wherein a portion of the second chamber extends forward of the first chamber. 18. A humidifier according to claim 9, wherein the second chamber outlet is disposed above the passage from the first chamber to the second chamber. 19. A humidifier according to claim 9, wherein a level of the predetermined maximum volume of liquid is below the passage in the upright, normal operating position. 20. A humidifier according to claim 9, wherein the first chamber and the second chamber are releasably engagable with each other. 21. A humidifier according to claim 20, wherein when the first chamber and the second chamber are engaged with each other, mating portions of the first chamber and the second chamber provide a seal between the first chamber and the second chamber. 22. A humidifier according to claim 21, wherein the mating portions provide a releasable connection between the first chamber and the second chamber. 23. An apparatus for supplying breathable gas under pressure, comprising: a blower to generate a flow of pressurized breathable gas;the humidifier according to claim 9 structured to reduce risk of or prevent spillback of liquid from the humidifier to the blower;a connecting structure configured to connect between the blower and the humidifier and allow communication of an outlet of the blower with the first chamber inlet of the humidifier; andan air delivery conduit in communication with output from the humidifier. 24. An apparatus according to claim 23, further comprising: a patient interface connected to the air delivery conduit. 25. A humidifier assembly for a CPAP apparatus, comprising: a humidifier that defines a reservoir for a body of liquid, and a fluid passage between an inlet provided at a rear side of the humidifier and an outlet of the humidifier for exposure of a flow of breathable gas from the CPAP apparatus to the body of liquid, the humidifier comprisinga base configured to retain the body of liquid therein and including a heat conducting material, anda top cover that covers the base, the top cover including the outlet; anda connecting structure configured to connect between the CPAP apparatus and humidifier and allow communication of an outlet of the CPAP apparatus with the inlet of the humidifier, the connecting structure comprising a housing, the housing providing a generally horizontal, open receptacle within which the humidifier may be removably disposed by generally horizontally inserting the humidifier within and pulling it out of the receptacle, the housing comprising a base portion forming a lower surface of the receptacle and configured to support the humidifier thereon, a heating element positioned on the lower surface and in thermal contact with the heat conducting material of the base when the humidifier is disposed in the receptacle, and a retaining portion positioned adjacent the top cover of the humidifier and being spaced above the base portion, the retaining portion being configured to assist in retaining the humidifier in the generally horizontal receptacle. 26. A humidifier assembly according to claim 25, wherein the base and the top cover are detachably connected to each other. 27. A humidifier assembly according to claim 26, wherein the housing comprises an opening that communicates with the inlet when the humidifier is fully inserted into the generally horizontal receptacle. 28. A humidifier assembly according to claim 27, further comprising a retaining mechanism to secure the connecting structure to the CPAP apparatus. 29. A humidifier assembly according to claim 28, wherein the retaining mechanism comprises a resiliently biased locking member configured to releasably engage a projection of the CPAP apparatus. 30. A humidifier assembly according to claim 29, further comprising a release member coupled to the resiliently biased locking member to move the resiliently biased locking member out of engagement with the projection of the CPAP apparatus. 31. A humidifier assembly according to claim 30, wherein the release member is provided in the base portion of the housing. 32. A humidifier assembly according to claim 25, wherein the heat conducting material of the base of the humidifier is provided in an opening in a bottom wall of the base of the humidifier. 33. A humidifier assembly according to claim 31, wherein the heating element is upwardly biased into engagement with the heat conducting material. 34. A humidifier assembly according to claim 33, wherein the heating element is a resistance heater. 35. A humidifier assembly according to claim 34, further comprising a seal between the heat conducting material and the bottom wall. 36. A humidifier assembly according to claim 35, wherein the connecting structure includes contact elements that communicate with a power supply, a controller, and/or sensors within the CPAP apparatus. 37. The humidifier assembly according to claim 36, further comprising a resiliently biased member to facilitate connection and disconnection between the humidifier and the connecting structure, wherein the humidifier is removed from the connecting structure by upwardly moving the member to withdraw its lugs from recesses on the connecting structure and pulling the humidifier generally horizontally out of the receptacle. 38. A CPAP system, comprising: a CPAP apparatus wherein the CPAP apparatus includes a controller to control the heating element of the humidifier assembly; anda humidifier assembly according to claim 37. 39. The CPAP system according to claim 38, wherein the CPAP apparatus includes a controller to control the heating element of the humidifier assembly. 40. A humidifier, comprising: a humidification chamber having a reservoir configured to store a body of liquid having a maximum value, the humidification chamber defining a portion of a fluid passage, the fluid passage configured to direct a flow of breathable gas into exposure with the body of liquid to humidify the flow of breathable gas, the humidification chamber also having an inlet for the flow of breathable gas and an outlet for the humidified flow of breathable gas; anda backflow chamber forming another portion of the fluid passage and in fluid communication with the humidification chamber, the backflow chamber having an inlet to receive the flow of breathable gas and an outlet in fluid communication with the inlet of the humidification chamber,wherein the maximum volume of the body of liquid is contained entirely in the humidification chamber when the humidifier is in a normal, upright operating position, and a level of the maximum volume of the body of liquid is below the humidification chamber inlet and/or the backflow chamber inlet when the humidifier is in a non-upright position in which a portion of the body of liquid is transferrable along the fluid passage from the humidification chamber to the backflow chamber. 41. A humidifier according to claim 40, wherein the humidification chamber and the backflow chamber are constructed and arranged to be releasably connected to each other, and when the humidification chamber and backflow chamber are connected to each other, the outlet of the backflow chamber engages and is in fluid communication with the inlet of the humidification chamber. 42. A humidifier according to claim 41, wherein the humidifier comprises a base, a top cover removably connected to the base, and a seal between the base and the top cover. 43. A humidifier according to claim 42, wherein the top cover includes the outlet of the humidification chamber. 44. A humidifier according to claim 43, wherein the base includes a receptacle that forms part of the humidification chamber. 45. A humidifier according to claim 44, wherein the base is formed of a transparent material. 46. A humidifier according to claim 45, wherein the top cover is formed of a transparent material. 47. A humidifier according to claim 46, wherein the base comprises a heat conducting plate provided in an opening in the base. 48. A humidifier according to claim 47, wherein the heat conducting plate is formed of metal. 49. A humidifier according to claim 48, wherein the heat conducting plate is circular. 50. A humidifier according to claim 49, further comprising a seal between the heat conducting plate and the base. 51. A humidifier assembly, comprising: the humidifier according to claim 50; anda connecting structure configured to connect between the humidifier and a CPAP apparatus and allow communication of an outlet of the blower with the backflow chamber inlet of the humidifier, the connecting structure comprising a housing defining a generally horizontally extending receptacle configured to receive the humidifier. 52. A humidifier assembly according to claim 51, wherein the housing comprises a base portion configured to support the humidifier and a retaining portion configured to retain the humidifier in the housing. 53. A humidifier assembly according to claim 52, wherein the retaining portion is spaced above the base portion and is generally parallel with the base portion when the humidifier is retained in the housing. 54. A humidifier assembly according to claim 53, wherein the base portion comprises a heating element configured to engage the heat conducting plate of the humidifier when the humidifier is retained in the housing. 55. A humidifier assembly according to claim 54, wherein the heating element is resiliently biased into engagement with the heat conducting plate. 56. A humidifier assembly according to claim 55, wherein the heating element is a flat plate-like resistance heater. 57. A humidifier assembly according to claim 56, wherein the housing comprises contact elements configured to receive power from the CPAP apparatus. 58. A humidifier assembly according to claim 57, wherein the housing comprises resiliently biased locking members on a side thereof that are configured to engage the CPAP apparatus to secure the connecting structure to the CPAP apparatus. 59. A humidifier assembly according to claim 58, further comprising a release member configured to move the resiliently biased locking members out of their biased position to release the connecting structure from the CPAP apparatus. 60. A humidifier assembly according to claim 59, wherein the release member is provided in the base portion of the housing. 61. An apparatus for humidifying breathable gas, comprising: a CPAP apparatus configured to generate a flow of breathable gas; anda humidifier assembly according to claim 60 releasably connected to the CPAP apparatus to humidify the flow of breathable gas. 62. An apparatus according to claim 61, wherein the flow of breathable gas from the CPAP apparatus enters the backflow chamber through the inlet of the backflow chamber, travels through the backflow chamber, and enters the humidification chamber through the inlet of the humidification chamber. 63. A humidifier, comprising: a humidification chamber having a reservoir configured to store a body of liquid having a maximum volume, the humidification chamber defining a portion of a fluid passage, the fluid passage configured to direct a flow of breathable gas into exposure with the body of liquid to humidify the flow of breathable gas, the humidification chamber also having an inlet for the flow of breathable gas and an outlet for the humidified flow of breathable gas; anda backflow chamber forming another portion of the fluid passage and in fluid communication with the humidification chamber, the backflow chamber having an inlet to receive the flow of breathable gas and an outlet in fluid communication with the inlet of the humidification chamber,wherein the maximum volume of the body of liquid is contained entirely in the humidification chamber when the humidifier is in a normal, upright operating position, and the maximum volume of the body of liquid is retained in the humidification chamber or in the humidification chamber and the backflow chamber below the inlet of the backflow chamber in a non-upright position in which a portion of the body of liquid is transferrable along the fluid passage from the humidification chamber to the backflow chamber. 64. A humidifier according to claim 63, wherein the humidification chamber and the backflow chamber are constructed and arranged to be releasably connected to each other, and when the humidification chamber and backflow chamber are connected to each other, the outlet of the backflow chamber engages and is in fluid communication with the inlet of the humidification chamber. 65. A humidifier according to claim 64, wherein the humidifier comprises a base, a top cover removably connected to the base, and a seal between the base and the top cover. 66. A humidifier according to claim 65, wherein the top cover includes the outlet of the humidification chamber. 67. A humidifier according to claim 66, wherein the base includes a receptacle that forms part of the humidification chamber. 68. A humidifier according to claim 67, wherein the base is formed of a transparent material. 69. A humidifier according to claim 68, wherein the top cover is formed of a transparent material. 70. A humidifier according to claim 69, wherein the base comprises a heat conducting plate provided in an opening in the base. 71. A humidifier according to claim 70, wherein the heat conducting plate is formed of metal. 72. A humidifier according to claim 71, wherein the heat conducting plate is circular. 73. A humidifier according to claim 72, further comprising a seal between the heat conducting plate and the base. 74. A humidifier assembly, comprising: the humidifier according to claim 73; anda connecting structure configured to connect between the humidifier and a CPAP apparatus and allow communication of an outlet of the CPAP apparatus with the backflow chamber inlet of the humidifier, the connecting structure comprising a housing defining a generally horizontally extending receptacle configured to receive the humidifier. 75. A humidifier assembly according to claim 74, wherein the housing comprises a base portion configured to support the humidifier and a retaining portion configured to retain the humidifier in the housing. 76. A humidifier assembly according to claim 75, wherein the retaining portion is spaced above the base portion and is generally parallel with the base portion when the humidifier is retained in the housing. 77. A humidifier assembly according to claim 76, wherein the base portion comprises a heating element configured to engage the heat conducting plate of the humidifier when the humidifier is retained in the housing. 78. A humidifier assembly according to claim 77, wherein the heating element is resiliently biased into engagement with the heat conducting plate. 79. A humidifier assembly according to claim 78, wherein the heating element is a flat plate-like resistance heater. 80. A humidifier assembly according to claim 79, wherein the housing comprises contact elements configured to receive power from the CPAP apparatus. 81. A humidifier assembly according to claim 80, wherein the housing comprises resiliently biased locking members on a side thereof that are configured to engage the CPAP apparatus to secure the connecting structure to the CPAP apparatus. 82. A humidifier assembly according to claim 81, further comprising a release member configured to move the resiliently biased locking members out of their biased position to release the connecting structure from the CPAP apparatus. 83. A humidifier assembly according to claim 82, wherein the release member is provided in the base portion of the housing. 84. An apparatus for humidifying breathable gas, comprising: a CPAP apparatus configured to generate a flow of breathable gas; anda humidifier assembly according to claim 83 releasably connected to the CPAP apparatus to humidify the flow of breathable gas. 85. An apparatus according to claim 84, wherein the flow of breathable gas from the CPAP apparatus enters the backflow chamber through the inlet of the backflow chamber, travels through the backflow chamber, and enters the humidification chamber through the inlet of the humidification chamber. 86. A humidifier assembly for a CPAP apparatus, comprising: a humidifier including: a base configured to hold a volume of liquid therein, at least a portion of the base being constructed of a heat conducting material, a top cover, anda seal disposed between the top cover and the base; anda connecting structure configured to connect between the CPAP apparatus and the humidifier and allow communication of an outlet of the CPAP apparatus with an inlet of the humidifier, the connecting structure including: a housing providing a base portion to support the humidifier thereon, the base portion includes a heating element in contact with the heat conducting material of the base of the humidifier,wherein the humidifier assembly further comprises:first and second internal passages;the first passage extending from a first inlet, through the base of the humidifier configured to hold the volume of liquid, and to a common outlet;the second passage extending from a second inlet to the common outlet;the first passage being disposed so as to be exposed to a surface of said volume of liquid when held in the humidifier;the second passage being configured to be able to communicate with a pressure and/or sound sensing device arranged to obtain measurement signals of the flow of breathable gas; and,the second passage being isolated from a surface of a said volume of liquid when held in the humidifier so as to avoid degradation of the measurement signals. 87. A humidifier assembly according to claim 86, wherein the connecting structure includes a control knob to control a heat setting of the heating element. 88. A humidifier assembly according to claim 87, wherein the connecting structure includes contact elements to communicate with a controller within the CPAP apparatus. 89. A humidifier assembly according to claim 87, wherein the connecting structure includes contact elements to communicate with sensors within the CPAP apparatus. 90. A humidifier assembly according to claim 86, wherein the connecting structure is configured to allow removable attachment of the CPAP apparatus to the humidifier. 91. A humidifier assembly according to claim 90, wherein the first and second inlets are coaxial. 92. A humidifier assembly according to claim 91, wherein the second internal passage is communicated with the common outlet via at least one aperture formed in the common outlet. 93. A humidifier assembly according to claim 92, wherein the top cover and the base of the humidifier are held together by a retaining clip. 94. A humidifier assembly according to claim 93, wherein the top cover includes an internal wall structure to guide gas, the internal wall structure extending downwardly from a top wall of the top cover towards the base. 95. A humidifier assembly according to claim 94, wherein the housing of the connecting structure provides a generally horizontally extending receptacle within which the humidifier may be disposed. 96. A humidifier assembly according to claim 95, wherein the connecting structure includes a retaining portion configured to secure the humidifier in position. 97. A CPAP apparatus including a humidifier assembly according to claim 96. 98. A CPAP apparatus according to claim 97, further comprising a power supply to provide power to both the CPAP apparatus and the humidifier assembly when the CPAP apparatus is connected to the humidifier assembly.
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