Drug delivery articles utilizing electrical energy

• US 4,922,901 A
• Filed: 09/08/1988
• Issued: 05/08/1990
• Est. Priority Date: 09/08/1988
• Status: Expired due to Fees

• Current Assignee: R J Reynolds Tobacco Company (R. J. Reynolds Tobacco)
• Original Assignee: R J Reynolds Tobacco Company (R. J. Reynolds Tobacco)
• Inventors: Roberts, Donald L., Brooks, Johnny L., Simmons, Jerry S.
• Primary Examiner(s): Burr, Edgar S.
• Assistant Examiner(s): Asher, Kimberly L.
• Application Number:
  US07/241,641
• Time in Patent Office: 607 Days
• Field of Search: 128/202.21, 128/203.12, 128/203.13, 128/203.15, 128/203.17, 128/203.26, 128/203.27, 128/204.13, 128/200.14, 128/200.23 , 128/200.24, 128/204.17, 128/202.27
• US Class Current: 128/203.26
• CPC Class Codes: A24F 40/10 Devices using liquid inhalable precursors
• CPC Class Codes: A24F 40/42 Cartridges or containers for inhalable precursors
• CPC Class Codes: A61M 11/04 operated by the vapour pressure of the liquid to be sprayed or atomised air-humidification, e.g. "room humidifiers" F24F6/00
• CPC Class Codes: A61M 11/042 electrical
• CPC Class Codes: A61M 11/044 with electrodes immersed in the liquid
• CPC Class Codes: A61M 15/00 Inhalators drug delivery in endotracheal tubes A61M16/04
• CPC Class Codes: A61M 15/06 Inhaling appliances shaped like cigars, cigarettes or pipes
• CPC Class Codes: A61M 16/109 the humidifying liquid or the beneficial agent
• CPC Class Codes: A61M 2016/0024 with an on-off output signal, e.g. from a switch
• CPC Class Codes: A61M 2205/8206 battery-operated

Abstract

Drug delivery articles employ an electrical resistance heating element and an electrical power source to provide a dose of a drug in aerosol form. The articles advantageously comprise a disposable portion and a reusable controller. The disposable portion, normally includes a drug and an air permeable resistance heating element having a surface area greater than 1 m² /g, which usually carries an aerosol forming material. The reusable controller normally includes a puff-actuated current actuation means, a time-based current regulating means to control the temperature of the heating element, and a battery power supply.

Claims

1. A disposable portion of a drug delivery article containing a drug for use with a source of electrical power comprising:

(a) an electrical resistance heating element

having a surface area greater than 1 m² /g; and

(b) aerosol forming substance carried by the heating element prior to use.

2. The disposable article of claim 1, wherein the heating element has a surface area greater than 50 m² /g.

3. The disposable article of claim 1, wherein the heating element has a surface area greater than 250 m² /g.

4. The disposable article of claim 1, wherein the heating element has a surface area greater than 1,000 m² /g.

5. The disposable article of claim 1, 2, 3 or 4, wherein the heating element comprises a porous material and the aerosol forming substance comprises a liquid impregnated within the heating element.

6. The disposable article of claim 1, 2, 3 or 4, wherein the heating element is a fibrous material.

7. The disposable article of claim 1, 2, 3 or 4, wherein the heating element comprises a fibrous material and the aerosol forming substance comprises a liquid impregnated within the fibrous material.

8. The disposable article of claim 1, 2, 3 or 4, wherein the heating element comprises carbon fibers.

9. The disposable article of claim 1, 2, 3 or 4, wherein the heating element comprises carbon fibers and the aerosol forming substance comprises a liquid impregnating the carbon fibers.

10. The disposable article of claim 1, wherein the disposable article includes an air passageway at least partially therethrough, and the electrical resistance element comprises an air permeable heating element positioned in the passageway.

11. The disposable article of claim 10, wherein the heating element is positioned substantially perpendicularly to the longitudinal axis of the air passageway.

12. The disposable article of claim 10, wherein the heating element is disposed substantially across the passageway.

13. The disposable article of claim 10, wherein the heating element comprises a pad positioned across the air passageway.

14. The disposable article of claim 10, 11, 12 or 13, wherein the heating element has a surface area greater than 50 m² /g.

15. The disposable article of claim 10, 11, 12 or 13, wherein the heating element has a surface area greater than 1,000 m² /g.

16. The disposable article of claim 10, 11, 12 or 13, wherein the heating element comprises carbon fibers.

17. The disposable article of claim 1, 10, 11, 12 or 13, wherein the heating element is positioned adjacent one end of the article.

18. The disposable article of claim 17, wherein the heating element is adapted for connection to an external source of electrical power.

19. The disposable article of claim 1, 10, 11, 12 or 13, including means for connecting the heating element to an external source of electrical power.

20. The disposable article of claim 19, wherein the means for connecting the heating element to the external source of electrical power includes an air passageway.

21. The disposable article of claim 19, including an air outlet for delivering aerosol to the user, and wherein the air outlet and the means for connecting the heating element to the external source of eIectrical power are at opposIte ends of the disposable article.

22. The disposable article of claim 19, including an air outlet for delivering aerosol to the user and wherein the air outlet and the means for connecting the heating element to the external source of electrical power are at the same end of the disposable article.

23. The disposable article of claim 1, 2, 3, 4 or 10, wherein the aerosol forming substance includes a drug.

24. The disposable article of claim 1, 2, 3, 4 or 10, wherein the aerosol forming substance includes a drug and at least one polyhydric alcohol.

25. The disposable article of claim 1, 2, 3, 4 or 10, wherein the drug is carried by the heating element prior to use.

26. The disposable article of claim 1, 2, 3, 4, or 10, wherein the disposable article includes a mouth end, and the drug is located between the heating element and the mouth end of the article.

27. The disposable article of claim 10, 11, 12 or 13, wherein the aerosol forming substance is a liquid impregnated within the electrical resistance element.

28. The disposable article of claim 1, 10 or 13, in the form of a cartridge.

45. The disposable article of claim 1, 10, 29 or 32, wherein the article includes sufficient aerosol forming substance and drug to deliver at least 0.5 mg of wet total particulate matter on each puff, for at least 6 puffs, when the article is puffed under conditions of 2 second, 35 ml puffs, taken every 60 seconds.

46. The disposable article of claim 1, 10, 29 or 32, wherein the article includes sufficient aerosol forming substance and drug to deliver at least 0.8 mg of wet total particulate matter on each puff, for at least 6 puffs, when the article is puffed under conditions of 2 second, 35 ml puffs, taken every 60 seconds.

47. The disposable article of claim 1, 10, 29 or 32, wherein the aerosol forming substance comprises a liquid, and wherein the article includes sufficient aerosol forming substance and drug to deliver at least 0.5 mg of wet total particulate matter on each puff, for at least 6 puffs, when the article is puffed under conditions of 2 second, 35 ml puffs, taken every 60 seconds.

29. A disposable portion of a drug delivery article containing a drug for use with a source of electrical power comprising:

(a) an air passageway at least partially through the disposable portion;

(b) an air permeable electrical heating element located in the air passageway; and

(c) an aerosol forming substance.

30. The disposable article of claim 29, wherein the heating element is positioned substantially perpendicularly to the longitudinal axis of the air passageway.

31. The disposable article of claim 29, wherein the heating element substantially fills the cross sectional area of the air passageway.

32. The disposable article of claim 29, wherein the heating element comprises a pad positioned across the air passageway.

33. The disposable article of claim 29, 30, 31 or 32, wherein the aerosol forming substance is carried by the heating element prior to use.

34. The disposable article of claim 29, 30, 31 or 32, wherein the heating element comprises a fibrous mass.

35. The disposable article of claim 34, wherein the aerosol forming substance is a liquid carried by the fibrous mass.

36. The disposable article of claim 29, 30, 31 or 32, wherein the heating element comprises carbon fibers.

37. The disposable article of claim 36, wherein the aerosol forming substance is a liquid carried by the carbon fibers.

38. The disposable article of claim 29, 30, 31 or 32, wherein the heating element is adjacent one end of the article.

39. The disposable article of claim 38, wherein the heating element is adapted for connection to an external source of electrical power.

40. The disposable article of claim 38, including an air outlet for delivering aerosol to the user and wherein the heating element is adjacent the end remote from the air outlet.

41. The disposable article of claim 29, 30, 31 or 32, including an air outlet for delivering aerosol to the user and wherein the heating element is adjacent the air outlet.

42. The disposable article of claim 29, 30, 31 or 32, wherein the aerosol forming substance includes a drug.

43. The disposable article of claim 29, 30, 31 or 32, wherein the drug is carried by the heating element prior to use.

44. The disposable article of claim 29, 30, 31 or 32, wherein the drug is located between the heating element and the mouth end of the article.

48. A drug delivery article containing a drug for use with a source of electrical power comprising:

(a) an electrical resistance heating element having a surface area greater than 1 m² /g;

(b) aerosol forming substance carried by the heating element prior to use; and

(c) puff actuated control means for permitting current flow through the heating element during draw by the user.

49. The drug delivery article of claim 48, further including means for regulating current flow through the heating element during draw.

50. The drug delivery of claim 48 or 49, further comprising a source of electrical power.

51. The drug delivery article of claim 48 or 49, wherein the heating element comprises a porous material and the aerosol forming substance comprises a liquid impregnated within the heating element.

52. The drug delivery article of claim 48 or 49, wherein the heating element is a fibrous material.

53. The drug delivery article of claim 48 or 49, wherein the heating element comprises a fibrous material and the aerosol forming substance comprises a liquid impregnated within the heating element.

54. The drug delivery article of claim 48 or 49, wherein the heating element comprises carbon fibers.

55. The drug delivery article of claim 48 or 49, wherein the heating element comprises carbon fibers and the aerosol forming substance comprises a liquid impregnating the carbon fibers.

56. The drug delivery article of claim 48 or 49, wherein the heating element has a surface area greater than 50 m² /g.

57. The drug delivery article of claim 48 or 49, wherein the heating element has a surface area greater than 1,000 m² /g.

58. The drug delivery article of claim 48 or 49, wherein the drug is located between the heating element and the mouth end of the article.

59. The drug delivery article of claim 48 or 49, wherein the drug is carried by the heating element prior to use.

60. The drug delivery article of claim 48 or 49, wherein the aerosol forming substance includes a drug.

61. The drug delivery article of claim 48 or 49, wherein the aerosol forming substance includes at least one polyhydric alcohol.

62. The drug delivery article of claim 49, wherein the means for regulating current flow during draw comprises a timer.

63. The drug delivery article of claim 62, wherein the means for regulating current flow during draw further comprises a timer responsive switching means for enabling and disabling current flow to the resistance element during draw.

64. The drug delivery article of claim 49, 62 or 63, wherein the means for regulating current flow during draw includes a capacitor and means for charging and discharging the capacitor at a rate which approximates a rate at which the resistance element heats and cools.

65. The drug delivery article of claim 49, wherein the means for regulating current flow during draw comprises (i) means for permitting uninterrupted current flow through the resistance element for an initial time period during draw, and (ii) means for subsequently regulating current flow until draw is completed.

66. The drug delivery article of claim 65, wherein the means for subsequently regulating current flow comprises means for switching the current flow alternately off and on.

67. The drug delivery article of claim 66, wherein the means for switching the current flow off and on includes means for generating a preset switching cycle.

68. The drug delivery article of claim 67, wherein the means for generating the preset switching cycle includes a timer.

69. The drug delivery article of claim 68, wherein the timer generates a periodic digital wave form.

70. The drug delivery article of claim 49, wherein the means for regulating current flow comprises (i) timer means, activated by the puff control means, for generating a pulse train having a predetermined duty cycle, and (ii) timer responsive switching means for enabling and disabling current flow to the heating element in response to the pulse train from the timer means.

71. The drug delivery article of claim 49, wherein the means for regulating current flow during draw includes means for controlling the average current flow through the heating element during a portion of the draw.

72. The drug delivery article of claim 49, wherein the means for regulating current flow during draw includes (i) means for enabling uninterrupted passage of current through the heating element for a predetermined initial time period, and (ii) means for controlling the average current which passes through the heating element upon passage of the predetermined initial time.

73. The drug delivery article of claim 72, wherein the average current control means comprises (i) timer means for generating a pulse train having a predetermined duty cycle, and (ii) timer responsive switching means for enabling and disabling the current through the electrical heating element in response to the pulse train from the timer means, and wherein the enabling means for the initial time period comprises means for disabling the timer means during the initial time period and enabling the timer means upon passage of the initial time period.

74. The drug delivery article of claim 73, wherein the enabling means for the initial time period further comprises (i) comparator means for comparing a first voltage at a first input to a threshold voltage at a threshold input and generating an output signal when the first voltage is equal to the threshold voltage, the output signal enabling the timer means;

(ii) means for generating the threshold voltage at the threshold input; and

(iii) means for generating the threshold voltage at the first input upon passage of the initial time period.

75. The drug delivery article of claim 49, further comprising means for limiting the temperature of the heating element when a puff occurs before the heating element has cooled after a prior puff.

76. The drug delivery article of claim 49, wherein the puff actuated control means comprises means for sensing changes in air pressure within the article.

77. A drug delivery article containing a drug for use with a source of electrical power comprising:

(a) an electrical resistance heating element;

(b) aerosol forming substance;

(c) switch means for actuating and deactuating current flow through the heating element; and

(d) time based means for (i) permitting unrestricted current flow through the heating element for an initial predetermined time period upon current actuation, and (ii) means for subsequently regulating current flow until current deactuation.

78. The drug delivery article of claim 77, wherein the aerosol forming substance is carried by the heating element prior to use.

79. The drug delivery article of claim 78, wherein the heating element has a surface area greater than 1 m² /g.

80. The drug delivery article of claim 77, 78 or 79, further comprising a source of electrical power.

81. The drug delivery article of claim 77, 78 or 79, wherein the heating element comprises a porous material and the aerosol forming substance comprises a liquid impregnated within the heating element.

82. The drug delivery article of claim 77, 78 or 79, wherein the heating element is a fibrous material.

83. The drug delivery article of claim 77, 78 or 79, wherein the heating element comprises a fibrous material and the aerosol forming substance comprises a liquid impregnated within the heating element.

84. The drug delivery article of claim 77, 78 or 79, wherein the heating element comprises carbon fibers.

85. The drug delivery article of claim 77, 78 or 79, wherein the heating element comprises carbon fibers and the aerosol forming substance comprises a liquid impregnating the carbon fibers.

86. The drug delivery article of claim 77, 78 or 79, wherein the heating element has a surface area greater than 50 m² /g.

87. The drug delivery article of claim 77, 78 or 79, wherein the heating element has a surface area greater than 1,000 m² /g.

88. The drug delivery, article of claim 77, 78 or 79, wherein the drug is carried by the heating element prior to use.

89. The drug delivery article of claim 77, 78 or 79, wherein the aerosol forming substance includes a drug.

90. The drug delivery article of claim 77, 78 or 79, wherein the aerosol forming substance includes a drug and at least one polyhydric alcohol.

91. The drug delivery article of claim 77, 78 or 79, wherein the heating element carries sufficient aerosol forming substance and drug to deliver at least 0.5 mg of wet total particulate matter on each puff, for at least 6 puffs, when puffed under conditions of 2 second, 35 ml puffs, taken every 60 seconds.

92. The drug delivery article of claim 77, 78 or 79, wherein the means for subsequently regulating current flow until current deactivation includes means for controlling the average current flow through the heating element.

93. The drug delivery article of claim 77, 78 or 79, wherein the means for permitting current flow for the initial time period and for subsequently regulating current flow until current deactivation includes means for controlling the temperature range to which the heating element is heated during draw.

94. The drug delivery article of claim 77, 78 or 79, wherein the means for subsequently regulating current flow until current deactivation comprises a timer.

95. The drug delivery article of claim 77, 78 or 79, wherein the means for subsequently regulating current flow until current deactivation further comprises a timer responsive switching means for enabling and disabling current flow to the heating element.

96. The drug delivery article of claim 77, 78 or 79, wherein the means for permitting current flow for the initial time period comprises a comparator means.

97. The drug delivery article of claim 77, 78 or 79, wherein the means for permitting current flow for the initial time period includes a capacitor and means for charging and discharging the capacitor at a rate which approximates a rate at which the heating element heats and cools.

98. The drug delivery article of claim 77, 78 or 79, wherein the means for subsequently regulating current flow comprises means for switching the current flow alternately off and on.

99. The drug delivery article of claim 77, wherein the means for subsequently regulating current flow comprises a timer means for generating a periodic digital wave form having a preset duty cycle.

100. The drug delivery article of claim 77, wherein the means for subsequently regulating current flow until current deactivation comprises (i) timer means for generating a pulse train having a predetermined duty cycle, and (ii) time responsive switching means for enabling and disabling the current through the electrical heating element in response to the pulse train from the timer means, and wherein the means for permitting current flow for the initial time period comprises means for disabling the timer means during the initial time period and enabling the timer means upon passage of the initial time period.

101. The drug delivery article of claim 100, wherein the means for permitting current flow for the initial time period further comprises (i) comparator means for comparing a first voltage at a first input to a threshold voltage at a threshold input and generating an output signal when the first voltage is equal to the threshold voltage, the output signal enabling the timer means;

(ii) means for generating the threshold voltage at the threshold input; and

(iii) means for generating the threshold voltage at the first input upon passage of the initial time period.

102. The drug delivery article of claim 100 or 101, wherein the means for permitting current flow for the initial time period includes a capacitor and means for charging and discharging the capacitor at a rate which approximates a rate at which the heating element heats and cools.

103. The drug delivery article of claim 77, wherein the means for permitting current flow for the initial time period and for subsequently regulating current flow comprises (i) timer means, activated by the current actuation and deactuation means, for generating a pulse train having a predetermined duty cycle, and (ii) timer responsive switching means for enabling and disabling current flow to the heating element in response to the pulse train from the timer means.

104. A drug delivery article containing a drug for use with a source of electrical power comprising:

(a) an air passageway at least partially through the article;

(b) an air permeable electrical resistance heating element located in the air passageway;

(c) an aerosol forming substance;

(d) puff actuated control means for permitting current flow through the heating element during draw by the user; and

(e) a mouth end.

105. The drug delivery article of claim 104, wherein the aerosol forming substance is carried by the heating element.

106. The drug delivery article of claim 104, further comprising means for regulating current flow through the heating element during draw.

107. The drug delivery article of claim 106, wherein the aerosol forming substance is carried by the heating element.

108. The drug delivery article of claim 104, 105, 106 or 107, wherein the aerosol forming substance includes a drug.

109. The drug delivery article of claim 104, 105, 106 or 107, wherein the drug is carried by the heating element prior to use.

110. The drug delivery article of claim 104, 105, 106 or 107, wherein the drug is located between the heating element and the mouth end of the article.

111. The drug delivery article of claim 104, 105, 106 or 107, wherein the heating element is positioned substantially perpendicularly to the longitudinal axis of the air passageway.

112. The drug delivery article of claim 104, 105, 106 or 107, wherein the heating element substantially fills the cross sectional area of the air passageway.

113. The drug delivery article of claim 104, 105, 106 or 107, wherein the heating element comprises a pad positioned across the air passageway.

114. The drug delivery article of claim 104, 105, 106 or 107, wherein the aerosol forming substance is carried by the heating element prior to use.

115. The drug delivery article of claim 105 or 107, wherein the heating element comprises a fibrous mass.

116. The drug delivery article of claim 105 or 107, wherein the heating element comprises a fibrous mass and the aerosol forming substance is a liquid carried by the fibrous mass.

117. The drug delivery article of claim 105 or 107, wherein the heating element comprises carbon fibers.

118. The drug delivery article of claim 105 or 107, wherein the heating element comprises carbon fibers and the aerosol forming substance is a liquid carried by the carbon fibers.

119. The drug delivery article of claim 104, 105, 106 or 107, wherein the heating element is adjacent one end of the article.

120. The drug delivery article of claim 106, wherein the means for regulating current flow during draw comprises a timer.

121. The drug delivery article of claim 107, wherein the means for regulating current flow during draw comprises a timer.

122. The drug delivery article of claim 120, wherein the means for regulating current flow during draw further comprises a timer responsive switching means for enabling and disabling current flow to the heating element during draw.

123. The drug delivery article of claim 121, wherein the means for regulating current flow during draw further comprises a timer responsive switching means for enabling and disabling current flow to the heating element during draw.

124. The drug delivery article of claim 106, 107, 120 or 121, wherein the means for regulating current flow during draw includes a capacitor and means for charging and discharging the capacitor at a rate which approximates a rate at which the heating element heats and cools.

125. The drug delivery article of claim 106, wherein the means for regulating current flow during draw comprises (i) means for permitting uninterrupted current flow through the heating element for an initial time period during draw, and (ii) means for subsequently regulating current flow until draw is completed.

126. The drug delivery article of claim 125, wherein the means for subsequently regulating current flow comprises means for switching the current flow alternately off and on.

127. The drug delivery article of claim 126, wherein the means for switching the current flow off and on includes means for generating a preset switching cycle.

128. The drug delivery article of claim 127, wherein the means for generating the preset switching cycle includes a timer.

129. The drug delivery article of claim 128, wherein the timer generates a periodic digital wave form.

130. The drug delivery article of claim 106, wherein the means for regulating current flow comprises (i) timer means, activated by the puff control means, for generating a pulse train having a predetermined duty cycle, and (ii) timer responsive switching means for enabling and disabling current flow to the heating element in response to the pulse train from the timer means.

131. The drug delivery article of claim 106, wherein the means for regulating current flow during draw includes means for controlling the average current flow through the heating element during a portion of the draw.

132. The drug delivery article of claim 106, wherein the means for regulating current flow during draw includes (i) means for enabling unrestricted passage of current through the resistance element for a predetermined initial time period, and (ii) means for controlling the average current which passes through the resistance element upon passage of the predetermined initial time.

133. The drug delivery article of claim 132, wherein the average current control means comprises (i) timer means for generating a pulse train having a predetermined duty cycle, and (ii) timer responsive switching means for enabling and disabling the current through the electrical resistance element in response to the pulse train from the timer means, and wherein the enabling means for the initial time period comprises means for disabling the timer means during the initial time period and enabling the timer means upon passage of the initial time period.

134. The drug delivery article of claim 133, wherein the enabling means for the initial time period further comprises (i) comparator means for comparing a first voltage at a first input to a threshold voltage at a threshold input and generating an output signal when the first voltage is equal to the threshold voltage, the output signal enabling the timer means;

(ii) means for generating the threshold voltage at the threshold input; and

(iii) means for generating the threshold voltage at the first input upon passage of the initial time period.

135. The drug delivery article of claim 108, further comprising means for limiting the temperature of the heating element when a puff occurs before the heating element has cooled after a prior puff.

136. The drug delivery article of claim 105, wherein the puff actuated control means comprises means for sensing changes in air pressure within the article.