EP1472140A1 - Apparatus and method for sealing cavities - Google Patents

Apparatus and method for sealing cavities

Info

Publication number
EP1472140A1
EP1472140A1 EP02795750A EP02795750A EP1472140A1 EP 1472140 A1 EP1472140 A1 EP 1472140A1 EP 02795750 A EP02795750 A EP 02795750A EP 02795750 A EP02795750 A EP 02795750A EP 1472140 A1 EP1472140 A1 EP 1472140A1
Authority
EP
European Patent Office
Prior art keywords
layer
roller
pharmaceutical formulation
sealing
pharmaceutical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02795750A
Other languages
German (de)
French (fr)
Inventor
Carlos E. Schuler
William W. Alston
Dennis R. Rasmussen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nektar Therapeutics
Original Assignee
Nektar Therapeutics
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nektar Therapeutics filed Critical Nektar Therapeutics
Publication of EP1472140A1 publication Critical patent/EP1472140A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B7/00—Closing containers or receptacles after filling
    • B65B7/16—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons
    • B65B7/28—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons by applying separate preformed closures, e.g. lids, covers
    • B65B7/2842—Securing closures on containers
    • B65B7/2878—Securing closures on containers by heat-sealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/16—Applying or generating heat or pressure or combinations thereof by rotary members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B7/00—Closing containers or receptacles after filling
    • B65B7/16—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons
    • B65B7/162—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons by feeding web material to securing means
    • B65B7/164—Securing by heat-sealing

Definitions

  • a pharmaceutical formulation delivery technique involves the oral delivery of a pharmaceutical formulation in the form of a pill, capsule, or the like.
  • Inhaleable drug delivery where an aerosolized pharmaceutical formulation is orally or nasally inhaled by a patient to deliver the formulation to the patient's respiratory tract, has also proven to be an effective manner of delivery.
  • a pharmaceutical formulation is delivered deep within a patient's lungs where it may be absorbed into the blood stream.
  • Many types of inhalation devices exist including devices that aerosolize a dry powder.
  • the pharmaceutical formulation is often packaged in a container from which it may be made available to a user.
  • a dose or a portion of a dose may be stored between layers of a multi-layered package, conventionally referred to as a blister or blister pack.
  • a cavity is formed in a lower layer, the pharmaceutical formulation is deposited within the cavity, and an upper layer is scaled onto the lower layer, such as by heating and/or compressing the layers, to secure the pharmaceutical formulation within the cavity.
  • the cavity may be designed so that the user may gain access to the cavity by separating the layers, by pushing the pharmaceutical formulation through the top layer or through a weakened portion of the top layer, by puncturing one of the layers with an instrument, or the like.
  • an apparatus for sealing a first layer to a second layer, the second layer comprising one or more cavities adapted to contain a pharmaceutical formulation comprises a roller comprising a heating element; and a surface adapted to support the first and second layers, the surface being translatable relative to the roller; whereby the first layer may be heat sealed to the second layer when contacted by the roller to contain the pharmaceutical formulation within the one or more cavities.
  • an apparatus for sealing a first layer to a second layer, the second layer comprising one or more cavities adapted to contain a pharmaceutical formulation comprises a roller comprising a heating element; and a surface adapted to support the second layer, wherein at least a portion of the surface is substantially flat; whereby the first layer may be heat sealed to the second layer when contacted by the roller to contain the pharmaceutical formulation within the one or more cavities.
  • a method of sealing a package comprises providing a first layer and a second layer on a surface, the second layer comprising one or more cavities containing a pharmaceutical formulation; compressing the layers together with a heated roller; and translating the heated roller relative to the surface, whereby the first layer may be heat sealed to the second layer when contacted by the roller to contain the pharmaceutical formulation within the one or more cavities.
  • a pharmaceutical package is made by a process comprising providing a first layer and a second layer on a surface, the second layer comprising one or more cavities containing a pharmaceutical formulation; pressing the layers together with a heated roller; and translating the heated roller relative to the surface, whereby the first layer may be heat sealed to the second layer when contacted by the roller to contain the pharmaceutical formulation within the one or more cavities.
  • Figure 1 is a schematic perspective view of a sealing apparatus of the present invention
  • Figures 2A through 2C are schematic perspective views of the sealing apparatus of Figure 1 performing a sealing process
  • Figure 3A is a schematic sectional side view though line A-A of Figure 2B;
  • Figure 3B is a schematic sectional side view though line B-B of Figure 2C;
  • Figure 4 is a schematic sectional side view of a version of a multi- layered package that may be sealed with a sealing apparatus
  • Figure 5 is a schematic sectional side view of another version of a multi-layered package that may be sealed with a sealing apparatus
  • Figure 6A is a chart showing how temperature relates to position and contact portion in the sealing apparatus
  • Figure 6B is a schematic showing locations of temperature detection in a test multi-layered package
  • Figure 6C is a graph of the temperature at the locations shown in
  • Figures 7 A through 7D are graphs showing the temperature at locations shown in Figure 6B as a function of time when using the present sealing apparatus and when using a uniform heating sealing appartus;
  • Figure 8 a graph of an Instron test of the seal strength of a multi- layered package sealed with a sealing apparatus of the present invention with four sampled multi-layered packages sealed with a uniform heating process;
  • Figure 9 is a graph showing contours of the peak cavity temperatures as a function of roller temperature and contact time;
  • Figure 10 is a schematic perspective view of a version of a sealing apparatus of the present invention.
  • Figures 11A and 11B are schematic perspective views of versions of platforms of the sealing apparatus
  • Figure 12 is a schematic perspective view of another version of a sealing apparatus.
  • Figure 13 is a schematic perspective view of another version of a sealing apparatus.
  • the present invention relates to package sealing. Although the process is illustrated in the context of packaging a pharmaceutical formulation in a multi-layered package, the present invention can be used in other processes and should not be limited to the examples provided herein.
  • a sealing apparatus 100 according to the present invention is shown schematically in Figure 1.
  • the sealing apparatus comprises a platform 105 and a roller 110.
  • the platform 105 includes a surface 115 which supports an object that is to be sealed.
  • the roller 110 is translatable relative to the surface 115 so that the roller 110 may pass over at least a portion of the surface 115.
  • the roller 110 includes a roller surface 120 that rolls over at least a portion of the object on the surface 115.
  • the roller 110 includes a heating element 125 which is capable of heating the roller surface 120 to a desired temperature.
  • the heating element 125 may be positioned in the roller 110, as shown in Figure 1. Alternatively, the heating element 125 may be separated from but in communication with the roller 110 so as to be able to heat the roller surface 120.
  • the sealing apparatus 100 is adapted to seal a pharmaceutical formulation within a multi-layer package, such as a blister.
  • the sealing apparatus 100 may seal a plurality of layers to one another with the pharmaceutical formulation contained between the layers.
  • An exemplary sealing process is shown in Figures 2A through 2C.
  • a lower layer 130 of a multi- layered package is placed on the platform surface 115.
  • the lower layer 130 comprises a cavity 135 which may contain a pharmaceutical formulation.
  • the cavity 135 is positioned within a recess 140 in the surface 115 while a rim portion 145 rests on the surface 115.
  • the cavity 135 may be formed on the platform 105 and/or the pharmaceutical formulation may be inserted into the cavity 135 while the lower layer 130 is positioned on the surface 115.
  • a lower layer 130 with a preformed cavity 135 prefilled with the pharmaceutical formulation may be positioned onto the surface 115.
  • An upper layer 150 is then, or previously, positioned over the lower layer 130, as shown in Figure 2B.
  • FIGs 3A and 3B show cross-sectional views through lines A-A of Figure 2B and B-B of Figure 2C, respectively.
  • the lower layer 130 is positioned on the platform surface 110 with the cavity 135, which is filled with a pharmaceutical formulation, positioned within the recess 140.
  • the upper layer 150 is positioned over the lower layer 130.
  • the lower layer 130 is a sealing material that may cause a seal to be formed between the upper layer 150 and the lower layer 130 when heated and/or compressed.
  • the platform 105 is translated relative to the roller 110 in the direction shown by the arrow 160.
  • a seal 165 is formed between the layers, for example by being formed between the rim portion 145 of the lower layer 130 and the portion of the upper layer 150 which contacts the rim portion 145.
  • the recess 140 may be shaped to more closely resemble the contour of the cavity 135.
  • the roller 110 may apply compression between the upper layer 150 and the lower layer 130.
  • the separation distance, d, between the roller 110 and the platform surface 115 is less than the combined thickness of the lower layer 130 and the upper layer 150 so that the layers are compressed as they pass between the roller 110 and the surface 115.
  • the distance, d may be from about 0 % to about 100% of the combined thickness of the layers, more preferably from about 30% to about 98%, and most preferably from about 60% to about 95%.
  • the roller 110 may rest on the platform surface 115 and the mass of the roller 110 may serve to compress the layers together. Additionally, the roller 110 may be designed to rotate in the direction of the arrow 170.
  • an actuator such as a rotary motor, may be provided to cause the roller 110 to rotate. The motor may control the rotation of the roller 110 in accordance with the translation of the surface 115 relative to the roller 110. Alternatively, the motor may rotate the roller 110 to cause the translation.
  • the roller 110 freely rotates so that the translation of the surface 115 and the friction of the object and/or the platform causes the roller 110 to rotate.
  • gearing may be provided so that translation of the platform 105 causes rotation of the roller 110 or so that rotation of the roller 110 causes translation of the platform 105.
  • the surface velocity is substantially zero, relative to a grounded reference.
  • the roller 110 may comprise a heating element 125 to provide heat to the layers to facilitate the sealing process.
  • the heating element 125 may be positioned within the roller 110. The heating element 125 is adapted to heat the roller surface 120, primarily by conducting heat through the roller 110.
  • the heated surface 120 then contacts the layers as the layers are passed between the roller 110 and the platform 105. Accordingly, the roller surface 120 can be heated to a predetermined temperature which is determined to apply sufficient heat for a translation velocity to be used.
  • the heating element 125 may comprise a heat generating element, such as a cylindrical resistive heater cartridge, placed within a cylindrical hole that extends along the roller's axis of rotation.
  • the roller 110 may comprise a high heat conducting material, such as metal, in order to ensure a substantially uniform temperature profile across the roller surface 120.
  • the roller 110 may be of any suitable radius. Preferably, the radius of the roller is selected so that the rotation of the roller 110 during a sealing process is less than about 360 degrees, and more preferably less than about 270 degrees, for temperature stability.
  • the heating element is exterior to the roller 110.
  • the heating element may be positioned so that it transfers heat to the exterior surface of the roller surface 120, such as by convection and/or radiation.
  • the sealing material is positioned between the upper layer 150 and the lower layer 130 and comprises a material that can seal the upper layer 150 to the lower layer 130 when heat and/or compression is applied to the sandwiched layers.
  • the sealing material comprises a layer of heat activated sealer, such as lacquer, or polymethyl methacrylate (PMMA), or the like.
  • the heat activated sealer may be provided on the lower surface 175 of the upper layer 150. When heated to a sufficient temperature, such as at least about 140°C, and often at least about 160°C, the heat activated sealer changes state so that when cooled, the upper layer 150 is sealed to the lower layer 130.
  • the heat activated sealer may be provided on an upper surface of the lower layer 130 or may be a separate sheet positioned between the upper layer 150 and the lower layer 130.
  • the heat activated sealer may be the material of the upper layer 150 and/or the lower layer 130. In this version, sufficient heat may be applied to melt the material between the layers so that the layers may be fused to one another upon cooling.
  • the roller 110 may provide compression to the heat activated sealer during the sealing process to more evenly distribute the sealer and/or to help bond the upper layer 150 to the lower layer 130.
  • the sealing material may comprise an adhesive or bonding material that does not require heat to activate. Accordingly, in this version, the roller 110 may be used to compress the layers and improve the sealing of the layers.
  • the sealing apparatus 100 of the present invention provides for advantageous sealing of multi-layered packages.
  • the use of a roller 110 that is translatable relative to a platform surface 115 is advantageous over a flat compression and/or heating member that uniformly or substantially uniformly engages the upper layer 150.
  • the roller surface 120 contacts only a portion of the upper layer 150.
  • the contact portion, c is the portion of the upper layer 150 that contacts the roller surface 120.
  • This contact portion, c has a length that is less than the length of the upper layer 150. This shortened contact portion assures that a greater percentage of the surface is compressed, and the sealing material is more evenly distributed across the sealing area. As a result, the effects of material discontinuities or imperfections are minimized.
  • high temperatures can adversely affect some pharmaceutical formulations.
  • some pharmaceutical formulations undergo degradation when exposed to temperatures of about 100°C or greater, and others are at least partially altered when exposed to temperatures of about 80°C or greater.
  • High temperatures have been found to be particularly undesirable for powdered pharmaceutical formulations that are to be aerosolized in that the elevated temperature may lead to agglomerations and less than desirable aerosol performance and/or may lead to morphological degradation.
  • excessive heat can morphologically change other types of pharmaceutical formulations.
  • the sealing apparatus 100 may be used to seal a multi-layered package around a pharmaceutical formulation that is susceptible to degradation and/or reduced aerosol performance when exposed to excessive amounts of moisture.
  • the multi-layered package may comprise one or more layers that comp ⁇ se a moisture barrier material.
  • the moisture barrier material comprises one or more metals, such as aluminum, or the like and/or other moisture barrier matenals, such as polyamides, poly vinyl chlorides and the like.
  • the moisture barrier may be provided below and above the pharmaceutical formulation to provide additional moisture protection.
  • the multi-layered package 155 may comp ⁇ se a lower layer 130 comprising a metal containing layer 180 and an upper layer 150 comprising a metal containing layer 185.
  • the metal containing layers 180, 185 may be sufficiently thick to substantially prevent a significant amount of moisture from passing therethrough.
  • the metal containing layers 180, 185 may be from about 10 ⁇ m to about 100 ⁇ m, and more preferably from about 20 ⁇ m to about 80 ⁇ m.
  • the lower layer 130 and the upper layer 150 are sealed together by a layer of sealing mate ⁇ al, such as a layer of lacquer that may be from about 1 ⁇ m to about 20 ⁇ m.
  • a pharmaceutical formulation such as a pharmaceutical formulation in dry powder form 195 that may be aerosolized.
  • the pharmaceutical formulation may be in capsule, pill, elixir, or the like form.
  • the lower layer 130 and/or the upper layer 150 of the multi-layered package 155 may optionally include additional materials that serve to improve the sealing or moldabi ty of the layers.
  • Figure 5 shows a particular version of a multi-layered package 155 useful in providing a moisture barrier package for a pharmaceutical formulation.
  • the lower layer 130 comp ⁇ ses a first layer 200 comp ⁇ sing polyme ⁇ c mate ⁇ al, such as polyvinyl chlo ⁇ de, and having a thickness of about 60 ⁇ m, a second layer 205 comp ⁇ sing a polyamide, such as nylon, and having a thickness of about 25 ⁇ m, a third layer 210 comp ⁇ sing a metal, such as aluminum, and having a thickness of about 60 ⁇ m, and a fourth layer 215 comprising a polymeric material, such as polyvinyl chloride, and having a thickness of about 60 ⁇ m.
  • a first layer 200 comp ⁇ sing polyme ⁇ c mate ⁇ al such as polyvinyl chlo ⁇ de
  • a second layer 205 comp ⁇ sing a polyamide, such as nylon, and having a thickness of about 25 ⁇ m
  • a third layer 210 comp ⁇ sing a metal, such as aluminum, and having a thickness of about 60 ⁇ m
  • a fourth layer 215 comprising a poly
  • the upper layer 150 comprises a first layer 220 comprising a metal, such as aluminum, and having a thickness of about 25 ⁇ m, and a second layer 225 comprising a sealing material, such as lacquer, and having a thickness of about 6 ⁇ m.
  • the moisture protection provided by the packages of Figures 4 and 5 is improved by using the present sealing apparatus 100 to seal the upper layer 150 to the lower layer 130. It has been determined that with conventional sealing techniques, a pharmaceutical formulation within the cavity is sufficiently protected from moisture for from about 15 to about 20 days. However, with the present sealing apparatus 100, the moisture protection is significantly improved. Though the precise mechanism for the improvement is unknown, it is believed that one or more of the following contributes to the added moisture protection: 1) localized compression and rolling decreases the amount of entrapped air in the seal, 2) the effects of different coefficients of expansion is less pronounced, 3) improved reorientation of the polymeric materials under localized heat and pressure, and 4) partial combination of polymeric compression, flow and recovery provided by the roller leaves voids.
  • the use of a roller 110 comprising a heating element 125 localizes the application of heat to a particular portion along the length of the multi-layered package 155.
  • the temperature of the multi-layered package 155 is at a maximum at the contact portion, c, and is sharply reduced at the portions not directly in contact with the roller 110.
  • the contact portion may be from about 0.1 to about 1.0 inches, more preferably from about .05 to about 0.4 inches, more preferably from about 0.8 inches to about 0.20 inches, and most preferably about 0.12 inches.
  • the contact portion may be altered accordingly.
  • heat that is applied to the rim portion 145 of a multi-layered package is conducted 250 to the cavity 135 where it exposes the pharmaceutical formulation to heat.
  • This conduction of heat is particularly pronounced when one or more of the layers 130, 150 comprises a metal-containing layer.
  • the temperature during the sealing process was taken at four points on the multi-layered package 155: on the rim portion and spaced from the cavity 135, Tj; within the cavity 135 and in proximity to the rim portion 145, T 2 ; within the cavity 135 and below the level of a pharmaceutical formulation, T 3 ; and at the deepest portion of the cavity 135, T 4 .
  • the temperature of a roller 110 having a radius of about 2 inches was set to 180°C and the platform 105 and roller 110 were translated 160 at a velocity of about 0.8 inches/second to seal the multi-layered package shown in Figure 5 having a cavity with a length of about 0.45 inches and depth of about 0.1 inches
  • the resulting temperature curves at the four points during the sealing process are shown in Figure 6C.
  • Ti reaches a maximum of about 140°C when in contact with the roller 110, but the heat quickly dissipates as the roller 110 progresses beyond the point.
  • the local relatively high temperatures quickly diffuse throughout the layers to achieve an average temperature that is a reduced value.
  • the heat conducted to the cavity 135 is reduced, and the temperatures within the cavity, T 2 , T 3 , T , are held below about 65°C and do not significantly alter a pharmaceutical formulation within the cavity 135.
  • FIGs 7A through 7D This reduction in heating profiles is illustrated in Figures 7A through 7D which compare the temperatures during sealing using the localized heating provided by the present sealing apparatus 100 with the temperatures during sealing using an apparatus that uniformly heats the top of the multi-layered package 155.
  • the uniform heating process was carried out using a sealing plate heated to about 170°C that contacts the multi-layered package 155 for about 0.6 seconds.
  • the maximum temperature reached at Ti is significantly less using the process according to the present invention than the temperature at Ti using the uniform heating process, and the high temperatures are maintained for significantly less time using the present process.
  • the lower maximum temperature and the shortened time provide less heat for conduction to the cavity 135, and as a result the temperatures in the cavity 135 are reduced.
  • the temperature at T 2 for the uniform heating process is above 100°C for a significant duration of the sealing process. Temperatures about 100°C are damaging to some pharmaceutical formulations.
  • the cavity temperatures even deeper within the cavity approach or reach 100°C for the uniform heating process.
  • the localized heating using the process of the present invention results in cavity temperatures below about 65°C, thereby providing the ability to package pharmaceutical formulations that undergo heat damage at temperatures thereabove.
  • the heat damage to a pharmaceutical formulation within the cavity 135 can be further reduced by provided a space between the top of the pharmaceutical formulation and the upper layer 150. This prevents heat from passing directly from the upper layer 150 to the pharmaceutical formulation.
  • the quality of the sealing of the multi-layered package 155 is improved using the sealing apparatus 100 of the present invention.
  • Figure 8 shows a graph of an Instron test of the seal strength of a multi-layered package sealed according to the present process 270 with four sampled multi-layered packages sealed according to the uniform heating process described above.
  • the roller 110 in the present process was maintained at a lower temperature than the sealing plate of the uniform heating process and even though the maximum temperature reached along the rim portion 145 is lower with the present process, the strength of the seal is higher. Accordingly, with the present process, an improved seal is achieved while also preventing undesired alteration of a pharmaceutical formulation being packaged.
  • Figure 9 shows contours of the peak cavity temperatures as a function of roller temperature and contact time (the length of the contact portion, c, divided by the velocity of translation of the roller).
  • the peak cavity temperature is more affected by contact time than by roller temperature. Accordingly, assuming the contact time is held sufficiently low, very high roller temperatures may be employed without adversely heating the cavity 135.
  • Figure 9 demonstrates that the process is unexpectedly easy to control since contact time may be a more controllable variable than roller temperature.
  • a stage 300 is provided to support the platform 105 and the roller 110 and to provide for translation and/or rotation between the platform 105 and the roller 110.
  • the platform 105 is removably insertable onto a top surface 305 of the stage 300.
  • On the top surface is one or more indexing members 310 that receive the platform 105 to assure proper alignment of the platform 105 on the stage 300.
  • the stage 300 also comprises one or more guide rails 315.
  • the guide rails support a roller carrier 320 so that the roller carrier 230 may translate relative to the top surface 305 of the stage 300.
  • the roller carrier 320 comprises one or more roller supporting members 325. In the version shown, two roller supporting members 325 have a through hole 330 for rotatably receiving an extension 335 of the roller 310.
  • the roller carrier 320 may also comprise an opening 340 through which the bottom portion of the roller 110 may extend.
  • the size and thickness of the opening 340 is selected so that substantially only the contact area, c, portion of the roller surface 120 extends below side panels 345 of the roller carrier 320.
  • the side panels 345 serve as a heat shield to aid in localizing the application of heat to the contact area, c. Accordingly, when a multi-layer package is positioned on the surface 115 of the platform 105 and when the platform 105 is positioned on the stage 300, the roller surface 120 contacts the multi-layered package to seal the layers, as discussed above. This contact may be provided by positioning the roller 110 a predetermined distance above the top surface 305 of the stage 300 or above the surface 115 of the platform 105.
  • the contact may be provided by providing a mechanism, such as a spring, that biases the platform 105 toward the roller 110 or that biases the roller 110 toward the stage 300.
  • the spring may be sized and shaped to provide a predetermined amount of pressure to be applied to the package.
  • the amount of pressure may be controlled by selection of size and/or weight of the roller 110.
  • the platform 105 may be pivotably connected to the stage 300 so that the platform 105 may pivot about an axis parallel to its longitudinal axis. In this way, misalignment between the roller 110 and the platform 105 may be accommodated.
  • the roller 110 may be able to pivot.
  • the platform 105 may have a surface 115 having one or more recesses 140 therein.
  • a lower layer 130 having a formed cavity 135 may be positioned on the surface 115 so that the cavity 135 is positioned within the recess.
  • the recess may be used as a mold by which the cavity 135 may be formed, such as by cold forming.
  • a plurality of recesses 140 are provided in the platform, as shown in Figure 11 A.
  • the roller 110 is sufficiently wide to contact two or more multi-layered packages positioned on the platform 105.
  • an array of recesses 140 may be provided, as shown in Figure 1 IB. In this version, the translation of the roller 110 along the platform 105 extends a sufficient length to contact an array of multi-layered packages that are positioned on the platform 105.
  • the platform 105 may comprise an array of recesses, and the roller 110 may be adapted to only seal a portion of the array. The balance of the recesses may be sealed by one or more additional rollers or by the first roller making one or more additional passes across the array.
  • the platform 105 may be positionable on the stage 300 by a mechanism, such as a robotic mechanism, or may be positioned by hand. Alternatively, the platform 105 may be fixed to the stage 300, and the multi-layered package or an array of multi-layered packages may be positioned onto the platform 105 by a mechanism or by hand.
  • the surface 115 may be made of a material selected so that the roller 110 provides a predetermined amount of pressure on the multi-layered package.
  • the surface may be made of a material having a durometer of from about 10 to about 100.
  • the surface comprises a fluoroelastomer, such as Viton TM available from E.I. Dupont de Nemours, having a durometer of about 70.
  • VitonTM surface is also advantageous in that is offers excellent heat resistance.
  • the surface 115 may be substantially flat to provide ease in indexing and more precise control of the relative movements.
  • the relative rotation and/or translation of the roller 110 and the platform 105 may be controlled by a controller 350, as shown for example in Figures 12 and 13.
  • a rotary motor 360 is provided on a roller support member 325 in a manner where it may rotatably engage the roller 110, such as by receiving and engaging the extension 335.
  • the motor 360 may be cause rotation of the extension 335 and thereby cause rotation of the roller 110.
  • the controller 350 is in communication with the motor 360 and is adapted to control the operation of the roller 110, such as by causing the roller to rotate at a predetermined rotational velocity. In this way, the rotation of the roller 110 may drive the translation of the roller 110 relative to the platform 105 by causing the roller carrier 320 to slide along the guide rails 315.
  • the translation of the roller 110 may be provided by a motor 370 that forces the roller carrier 320 to slide along the guided rails 315, as shown in Figure 13.
  • a linear motor may be provided that acts directly on the roller carrier 320.
  • the motor 370 is a rotary motor that rotates a drive shaft 375 which in engages a projection 380 extending from the roller carrier 110 in a manner that translates rotation of the drive shaft 375 into translation of the projection 380, such as by providing teeth and grooves on respective members.
  • the roller 110 may be freely rotatable within the roller support 325 so that the translation of the roller carrier 320 and the resulting friction between the roller surface 120 and the multi-layered package causes the rotation of the roller 110.
  • the controller 350 may control the motor 370 of the version of Figure 13 in order to control the velocity of the translation.
  • both the rotation of the roller 110 and the translation of the roller 110 relative to the platform 105 may be controlled.
  • This version is advantageous in that there are reduced stresses applied to the components and/or to the package.
  • the roller 110 may be translated relative to the platform 105 by hand.
  • a variety of motors which are available in the commercial market are suitable for use.
  • the motors may include one or more of stepper motors, servo motors, pneumatic actuators, etc.
  • the motors may also provide input to the controller 350 by sensing the position of the roller 110 or the roller carrier 320 in order to provide added control to the process.
  • Such sensors can include encoded wheel transducers, potentiometers, etc. Hybrid or bidirectional transducers often pair input and output functions together.
  • a temperature sensor may be provided. The temperature sensor may be adapted to detect the temperature of the roller surface 120 or other surface. The temperature sensor may be in communication with the controller 350 and the controller may control the sealing process in accordance with the detected temperature.
  • the controller 350 may control the operation of the sealing apparatus 100 as discussed above. Although the controller 350 has been illustrated by way of an exemplary single controller device to simplify the description of present invention, it should be understood that the controller 350 may be a plurality of controller devices that may be connected to one another or a plurality of controller devices that may be connected to different components of the sealing apparatus 100. In one embodiment, the controller 350 comprises electronic hardware including electrical circuitry comprising integrated circuits that is suitable for operating or controlling the sealing apparatus 100. Generally, the controller 350 is adapted to accept data input, run algorithms, produce useful output signals, and may also be used to detect data signals from one or more sensors and other device components, and to monitor or control the process in the sealing apparatus 100. However, the controller 350 may merely perform one of these tasks.
  • the controller 350 may comprise one or more of (i) a computer comprising a central processor unit (CPU) which is interconnected to a memory system with peripheral control components, (ii) application specific integrated circuits (ASICs) that operate particular components of the sealing apparatus 100 or operate a particular process, and (iii) one or more controller interface boards along with suitable support circuitry.
  • Typical CPUs include the PowerPCTM, PentiumTM, and other such processors.
  • the ASICs are designed and preprogrammed for particular tasks, such as retrieval of data and other information from the sealing apparatus 100 and/or operation of particular device components.
  • Typical support circuitry includes for example, coprocessors, clock circuits, cache, power supplies and other well known components that are in communication with the CPU.
  • the CPU often operates in conjunction with a random access memory (RAM), a read-only memory (ROM) and other storage devices well known in the art.
  • RAM random access memory
  • ROM read-only memory
  • the RAM can be used to store the software implementation of the present invention during process implementation.
  • the programs and subroutines of the present invention are typically stored in mass storage devices and are recalled for temporary storage in RAM when being executed by the CPU.
  • the software implementation and computer program code product of the present invention may be stored in a memory device, such as an EPROM, and called into RAM during execution by the controller 350.
  • the computer program code may be written in conventional computer readable programming languages, such as for example, assembly language, C, C", Pascal, or native assembly. Suitable program code is entered into a single file, or multiple files, using a conventional text editor and stored or embodied in a computer-usable medium, such as a memory of the computer system. If the entered code text is in a high level language, the code is compiled to a compiler code which is linked with an object code of precompiled windows library routines. To execute the linked and compiled object code, the system user invokes the object code, causing the computer system to load the code in memory to perform the tasks identified in the computer program.
  • the controller 350 may comprise a microprocessor or
  • suitable microprocessors for use as a local microprocessor include the MC68HC711E9 by Motorola, the PIC16C74 by Microchip, and the 82930AX by Intel Corporation.
  • the microprocessor can include one microprocessor chip, multiple processors and/or co-processor chips, and/or digital signal processor (DSP) capability.
  • DSP digital signal processor
  • the sealing apparatus 100 is adapted to seal a dry powder pharmaceutical formulation with the cavity 135 of a multi-layered package.
  • the dry powder pharmaceutical formulation directly contacts the bottom layer 130 of the package, in which case it may be important to prevent the bottom layer 130 from reaching excessive temperatures.
  • a material such as a capsular container may be provided between the dry powder pharmaceutical formulation and the lower layer 130 of the package. In this case it may also be necessary to prevent excessive heat in the cavity because the heat may be conducted through the material and to the pharmaceutical formulation.
  • the cavity 135 may contain the pharmaceutical formulation in a form where it may be aerosolized for inhalation by the user.
  • the powder when in a powdered form, the powder may be initially stored in the sealed package, which is opened prior to aerosolization of the powder, as described in U.S. Patent 5,785,049, U.S. Patent 5,415,162, and U.S. Patent Application 09/583,312.
  • the powder may be contained in a capsule, as described in U.S. Patent 4,995,385, U.S. Patent 3,991,761, U.S. Patent 6,230,707, and PCT Publication WO 97/27892, the capsule being openable before, during, or after insertion of the capsule into an aerosolization device.
  • the powder may be aerosolized by an active element, such as compressed air, as described in US Patent 5,458,135, U.S. Patent 5,785,049, and U.S. Patent 6,257,233, or propellant, as described in US Patent Application 09/556,262, filed on April 24, 2000, and entitled "Aerosolization Apparatus and Methods", and in PCT Publication WO 00/72904.
  • the powder may be aerosolized in response to a user's inhalation, as described for example in the aforementioned US Patent Application 09/583,312 and U.S. Patent 4,995,385. All of the above references being incorporated herein by reference in their entireties.
  • the invention provides a system and method for aerosolizing a pharmaceutical formulation and delivering the pharmaceutical formulation to the lungs of the user.
  • the pharmaceutical formulation may comprise powdered medicaments, liquid solutions or suspensions, and the like, and may include an active agent.
  • the active agent described herein includes an agent, drug, compound, composition of matter or mixture thereof which provides some pharmacologic, often beneficial, effect. This includes foods, food supplements, nutrients, drugs, vaccines, vitamins, and other beneficial agents. As used herein, the terms further include any physiologically or pharmacologically active substance that produces a localized or systemic effect in a patient.
  • An active agent for incorporation in the pharmaceutical formulation described herein may be an inorganic or an organic compound, including, without limitation, drugs which act on: the peripheral nerves, adrenergic receptors, cholinergic receptors, the skeletal muscles, the cardiovascular system, smooth muscles, the blood circulatory system, synoptic sites, neuroeffector junctional sites, endocrine and hormone systems, the immunological system, the reproductive system, the skeletal system, autacoid systems, the alimentary and excretory systems, the histamine system, and the central nervous system.
  • drugs which act on: the peripheral nerves, adrenergic receptors, cholinergic receptors, the skeletal muscles, the cardiovascular system, smooth muscles, the blood circulatory system, synoptic sites, neuroeffector junctional sites, endocrine and hormone systems, the immunological system, the reproductive system, the skeletal system, autacoid systems, the alimentary and excretory systems, the histamine system, and the central nervous system.
  • Suitable active agents may be selected from, for example, hypnotics and sedatives, psychic energizers, tranquilizers, respiratory drugs, anticonvulsants, muscle relaxants, antiparkinson agents (dopamine antagnonists), analgesics, anti-inflammatories, antianxiety drugs (anxiolytics), appetite suppressants, antimigraine agents, muscle contractants, anti-infectives (antibiotics, antivirals, antifungals, vaccines) antiarthritics, antimalarials, antiemetics, anepileptics, bronchodilators, cytokines, growth factors, anti-cancer agents, antithrombotic agents, antihypertensives, cardiovascular drugs, antiarrhythmics, antioxicants, anti-asthma agents, hormonal agents including contraceptives, sympathomirnetics, diuretics, lipid regulating agents, antiandrogenic agents, antiparasitics, anticoagulants, neoplasties, an
  • the active agent may fall into one of a number of structural classes, including but not limited to small molecules, peptides, polypeptides, proteins, polysaccharides, steroids, proteins capable of eliciting physiological effects, nucleotides, oligonucleotides, polynucleotides, fats, electrolytes, and the like.
  • active agents suitable for use in this invention include but are not limited to one or more of calcitonin, erythropoietin (EPO), Factor VIII, Factor IX, ceredase, cerezyme, cyclosporin, granulocyte colony stimulating factor (GCSF), thrombopoietin (TPO), alpha- 1 proteinase inhibitor, elcatonin, granulocyte macrophage colony stimulating factor (GMCSF), growth hormone, human growth hormone (HGH), growth hormone releasing hormone (GHRH), heparin, low molecular weight heparin (LMWH), interferon alpha, interferon beta, interferon gamma, interleukin-1 receptor, interleukin-2, interleukin-1 receptor antagonist, interleukin-3, interleukin-4, interleukin-6, luteinizing hormone releasing hormone (LHRH), factor IX, insulin, pro-insulin, insulin analogues (e.g., mono-acyl,
  • Patent No. 5,922,675 which is incorporated herein by reference in its entirety
  • amylin, C-peptide, somatostatin, somatostatin analogs including octreotide, vasopressin, follicle stimulating hormone (FSH), insulin-like growth factor (IGF), insulintropin, macrophage colony stimulating factor (M-CSF), nerve growth factor (NGF), tissue growth factors, keratinocyte growth factor (KGF), glial growth factor (GGF), tumor necrosis factor (TNF), endothelial growth factors, parathyroid hormone (PTH), glucagon-like peptide thymosin alpha 1, Ilb/IIIa inhibitor, alpha-1 antitrypsin, phosphodiesterase (PDE) compounds, VLA-4 inhibitors, bisphosponates, respiratory syncytial virus antibody, cystic fibrosis transmembrane regulator (CFTR) gene, deoxyreibonuclease (Dnase), bacterici
  • Active agents for use in the invention further include nucleic acids, as bare nucleic acid molecules, vectors, associated viral particles, plasmid DNA or RNA or other nucleic acid constructions of a type suitable for transfection or transformation of cells, i.e., suitable for gene therapy including antisense.
  • an active agent may comprise live attenuated or killed viruses suitable for use as vaccines.
  • Other useful drugs include those listed within the Physician's Desk Reference (most recent edition).
  • the amount of active agent in the pharmaceutical formulation will be that amount necessary to deliver a therapeutically effective amount of the active agent per unit dose to achieve the desired result. In practice, this will vary widely depending upon the particular agent, its activity, the severity of the condition to be treated, the patient population, dosing requirements, and the desired therapeutic effect.
  • the composition will generally contain anywhere from about 1% by weight to about 99% by weight active agent, typically from about 2% to about 95% by weight active agent, and more typically from about 5% to 85% by weight active agent, and will also depend upon the relative amounts of additives contained in the composition.
  • compositions of the invention are particularly useful for active agents that are delivered in doses of from 0.001 mg/day to 100 mg/day, preferably in doses from 0.01 mg/day to 75 mg/day, and more preferably in doses from 0.10 mg/day to 50 mg/day. It is to be understood that more than one active agent may be incorporated into the formulations described herein and that the use of the term "agent" in no way excludes the use of two or more such agents.
  • the pharmaceutical formulation may comprise a pharmaceutically acceptable excipient or carrier which may be taken into the lungs with no significant adverse toxicological effects to the subject, and particularly to the lungs of the subject.
  • a pharmaceutical formulation may optionally include one or more pharmaceutical excipients which are suitable for pulmonary administration. These excipients, if present, are generally present in the composition in amounts ranging from about 0.01 % to about 95% percent by weight, preferably from about 0.5 to about 80%, and more preferably from about 1 to about 60% by weight.
  • excipients will, in part, serve to further improve the features of the active agent composition, for example by providing more efficient and reproducible delivery of the active agent, improving the handling characteristics of powders, such as flowability and consistency, and/or facilitating manufacturing and filling of unit dosage forms.
  • excipient materials can often function to further improve the physical and chemical stability of the active agent, minimize the residual moisture content and hinder moisture uptake, and to enhance particle size, degree of aggregation, particle surface properties, such as rugosity, ease of inhalation, and the targeting of particles to the lung.
  • One or more excipients may also be provided to serve as bulking agents when it is desired to reduce the concentration of active agent in the formulation.
  • compositions and additives useful in the present pharmaceutical formulation include but are not limited to amino acids, peptides, proteins, non-biological polymers, biological polymers, carbohydrates, such as sugars, derivatized sugars such as alditols, aldonic acids, esterified sugars, and sugar polymers, which may be present singly or in combination.
  • Suitable excipients are those provided in WO 96/32096, which is incorporated herein by reference in its entirety.
  • the excipient may have a glass transition temperatures (Tg) above about 35° C, preferably above about 40 °C, more preferably above 45° C, most preferably above about 55 °C.
  • Exemplary protein excipients include albumins such as human serum albumin (HSA), recombinant human albumin (rHA), gelatin, casein, hemoglobin, and the like.
  • Suitable amino acids (outside of the dileucyl-peptides of the invention), which may also function in a buffering capacity, include alanine, glycine, arginine, betaine, histidine, glutamic acid, aspartic acid, cysteine, lysine, leucine, isoleucine, valine, methionine, phenylalanine, aspartame, tyrosine, tryptophan, and the like.
  • Amino acids falling into this category include hydrophobic amino acids such as leucine, valine, isoleucine, tryptophan, alanine, methionine, phenylalanine, tyrosine, histidine, and proline.
  • Dispersibility- enhancing peptide excipients include dimers, trimers, tetramers, and pentamers comprising one or more hydrophobic amino acid components such as those described above.
  • Carbohydrate excipients suitable for use in the invention include, for example, monosaccharides such as fructose, maltose, galactose, glucose, D- mannose, sorbose, and the like; disaccharides, such as lactose, sucrose, trehalose, cellobiose, and the like; polysaccharides, such as raffinose, melezitose, maltodextrins, dextrans, starches, and the like; and alditols, such as mannitol, xylitol, maltitol, lactitol, xylitol sorbitol (glucitol), pyranosyl sorbitol, myoinositol and the like.
  • monosaccharides such as fructose, maltose, galactose, glucose, D- mannose, sorbose, and the like
  • disaccharides such as lac
  • the pharmaceutical formulation may also include a buffer or a pH adjusting agent, typically a salt prepared from an organic acid or base.
  • Representative buffers include organic acid salts of citric acid, ascorbic acid, gluconic acid, carbonic acid, tartaric acid, succinic acid, acetic acid, or phthalic acid, Tris, tromethamine hydrochloride, or phosphate buffers.
  • the pharmaceutical formulation may also include polymeric excipients/additives, e.g., polyvinylpyrrolidones, derivatized celluloses such as hydroxymethylcellulose, hydroxyethylcellulose, and hydroxypropylmethylcellulose, Ficolls (a polymeric sugar), hydroxyethylstarch, dextrates (e.g., cyclodextrins, such as 2-hydroxypropyl- ⁇ -cyclodextrin and sulfobutylether- ⁇ -cyclodextrin), polyethylene glycols, and pectin.
  • polymeric excipients/additives e.g., polyvinylpyrrolidones, derivatized celluloses such as hydroxymethylcellulose, hydroxyethylcellulose, and hydroxypropylmethylcellulose, Ficolls (a polymeric sugar), hydroxyethylstarch, dextrates (e.g., cyclodextrins, such as 2-hydroxyprop
  • the pharmaceutical formulation may further include flavoring agents, taste-masking agents, inorganic salts (for example sodium chloride), antimicrobial agents (for example benzalkonium chloride), sweeteners, antioxidants, antistatic agents, surfactants (for example polysorbates such as 'TWEEN 20" and "TWEEN 80"), sorbitan esters, lipids (for example phospholipids such as lecithin and other phosphatidylcholines, phosphatidylethanolamines), fatty acids and fatty esters, steroids (for example cholesterol), and chelating agents (for example EDTA, zinc and other such suitable cations).
  • inorganic salts for example sodium chloride
  • antimicrobial agents for example benzalkonium chloride
  • sweeteners for example polysorbates such as 'TWEEN 20" and "TWEEN 80”
  • surfactants for example polysorbates such as 'TWEEN 20" and "TWEEN 80”
  • sorbitan esters for example phospholipids such
  • compositions according to the invention are listed in “Remington: The Science & Practice of Pharmacy", 19 th ed., Williams & Williams, (1995), and in the “Physician's Desk Reference", 52 nd ed., Medical Economics, Montvale, NJ (1998), both of which are incorporated herein by reference in their entireties.
  • Mass median diameter is a measure of mean particle size, since the powders of the invention are generally polydisperse (i.e., consist of a range of particle sizes). MMD values as reported herein are determined by centrifugal sedimentation, although any number of commonly employed techniques can be used for measuring mean particle size.
  • Mass median aerodynamic diameter or “MMAD” is a measure of the aerodynamic size of a dispersed particle. The aerodynamic diameter is used to describe an aerosolized powder in terms of its settling behavior, and is the diameter of a unit density sphere having the same settling velocity, generally in air, as the particle. The aerodynamic diameter encompasses particle shape, density and physical size of a particle. As used herein, MMAD refers to the midpoint or median of the aerodynamic particle size distribution of an aerosolized powder determined by cascade impaction.
  • the powdered formulation for use in the present invention includes a dry powder having a particle size selected to permit penetration into the alveoli of the lungs, that is, preferably 10 ⁇ m mass median diameter (MMD), preferably less than 7.5 ⁇ m, and most preferably less than 5 ⁇ m, and usually being in the range of 0.1 ⁇ m to 5 ⁇ m in diameter.
  • the delivered dose efficiency (DDE) of these powders may be greater than 30%, more preferably greater than 40%, more preferably greater than 50% and most preferably greater than 60% and the aerosol particle size distribution is about 1.0 - 5.0 ⁇ m mass median aerodynamic diameter (MMAD), usually 1.5 - 4.5 ⁇ m MMAD and preferably 1.5 - 4.0 ⁇ m MMAD.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Medical Preparation Storing Or Oral Administration Devices (AREA)
  • Package Closures (AREA)
  • Closing Of Containers (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

An apparatus is provided for sealing a first layer (150) to a second layer (130), the second layer comprising one or more cavities (135) adapted to contain a pharmaceutical formulation. The apparatus comprises a roller (110) comprising a heating element (125), and a surface (1159) adapted to support the first and second layers, the surface being translatable relative to the roller. The first layer is heat sealed to the second layer when contacted by the roller to contain the pharmaceutical formulation within the one or more cavities.

Description

SEALING A PHARMACEUTICAL FORMULATION IN A PACKAGE
BACKGROUND
The need for effective therapeutic treatment of patients has resulted in the development of a variety of pharmaceutical formulation delivery techniques. One traditional technique involves the oral delivery of a pharmaceutical formulation in the form of a pill, capsule, or the like. Inhaleable drug delivery, where an aerosolized pharmaceutical formulation is orally or nasally inhaled by a patient to deliver the formulation to the patient's respiratory tract, has also proven to be an effective manner of delivery. In one inhalation technique, a pharmaceutical formulation is delivered deep within a patient's lungs where it may be absorbed into the blood stream. Many types of inhalation devices exist including devices that aerosolize a dry powder.
The pharmaceutical formulation is often packaged in a container from which it may be made available to a user. For example, a dose or a portion of a dose may be stored between layers of a multi-layered package, conventionally referred to as a blister or blister pack. Typically, a cavity is formed in a lower layer, the pharmaceutical formulation is deposited within the cavity, and an upper layer is scaled onto the lower layer, such as by heating and/or compressing the layers, to secure the pharmaceutical formulation within the cavity. The cavity may be designed so that the user may gain access to the cavity by separating the layers, by pushing the pharmaceutical formulation through the top layer or through a weakened portion of the top layer, by puncturing one of the layers with an instrument, or the like.
It is often difficult to effectively package some pharmaceutical formulations in conventional blister-type packages. For example, when heat sealing the layers of the package, the application of heat to seal the layers may also cause the temperature of the cavity to increase, thereby heating the pharmaceutical formulation in the cavity which may affect its properties. Additionally, conventional sealing techniques often do not form a sufficiently protective seal to prevent environmental degradation of the pharmaceutical formulation.
Therefore, it is desirable to be able to package a pharmaceutical formulation in a multi-layer package in an improved manner. It is further desirable to package a pharmaceutical formulation in a multi-layer package without substantially effecting the properties of the pharmaceutical formulation. It is still further desirable to improve the sealing of a multi-layer package to better protect a pharmaceutical formulation and/or to make the seal more consistent.
SUMMARY
The present invention satisfies these needs. In one aspect of the invention layers of a multi-layered package are sealed by a heated roller to provide an improved pharmaceutical package. In another aspect of the invention, an apparatus for sealing a first layer to a second layer, the second layer comprising one or more cavities adapted to contain a pharmaceutical formulation, comprises a roller comprising a heating element; and a surface adapted to support the first and second layers, the surface being translatable relative to the roller; whereby the first layer may be heat sealed to the second layer when contacted by the roller to contain the pharmaceutical formulation within the one or more cavities.
In another aspect of the invention, an apparatus for sealing a first layer to a second layer, the second layer comprising one or more cavities adapted to contain a pharmaceutical formulation, comprises a roller comprising a heating element; and a surface adapted to support the second layer, wherein at least a portion of the surface is substantially flat; whereby the first layer may be heat sealed to the second layer when contacted by the roller to contain the pharmaceutical formulation within the one or more cavities.
In another aspect of the invention, a method of sealing a package comprises providing a first layer and a second layer on a surface, the second layer comprising one or more cavities containing a pharmaceutical formulation; compressing the layers together with a heated roller; and translating the heated roller relative to the surface, whereby the first layer may be heat sealed to the second layer when contacted by the roller to contain the pharmaceutical formulation within the one or more cavities.
In another aspect of the invention, a pharmaceutical package is made by a process comprising providing a first layer and a second layer on a surface, the second layer comprising one or more cavities containing a pharmaceutical formulation; pressing the layers together with a heated roller; and translating the heated roller relative to the surface, whereby the first layer may be heat sealed to the second layer when contacted by the roller to contain the pharmaceutical formulation within the one or more cavities.
DRAWINGS
These features, aspects, and advantages of the present invention will become better understood with regard to the following description, appended claims, and accompanying drawings which illustrate exemplary features of the invention. However, it is to be understood that each of the features can be used in the invention in general, not merely in the context of the particular drawings, and the invention includes any combination of these features, where: Figure 1 is a schematic perspective view of a sealing apparatus of the present invention;
Figures 2A through 2C are schematic perspective views of the sealing apparatus of Figure 1 performing a sealing process;
Figure 3A is a schematic sectional side view though line A-A of Figure 2B;
Figure 3B is a schematic sectional side view though line B-B of Figure 2C;
Figure 4 is a schematic sectional side view of a version of a multi- layered package that may be sealed with a sealing apparatus; Figure 5 is a schematic sectional side view of another version of a multi-layered package that may be sealed with a sealing apparatus; Figure 6A is a chart showing how temperature relates to position and contact portion in the sealing apparatus;
Figure 6B is a schematic showing locations of temperature detection in a test multi-layered package; Figure 6C is a graph of the temperature at the locations shown in
Figure 6B as a function of time when using the present sealing apparatus;
Figures 7 A through 7D are graphs showing the temperature at locations shown in Figure 6B as a function of time when using the present sealing apparatus and when using a uniform heating sealing appartus; Figure 8 a graph of an Instron test of the seal strength of a multi- layered package sealed with a sealing apparatus of the present invention with four sampled multi-layered packages sealed with a uniform heating process;
Figure 9 is a graph showing contours of the peak cavity temperatures as a function of roller temperature and contact time; Figure 10 is a schematic perspective view of a version of a sealing apparatus of the present invention;
Figures 11A and 11B are schematic perspective views of versions of platforms of the sealing apparatus;
Figure 12 is a schematic perspective view of another version of a sealing apparatus; and
Figure 13 is a schematic perspective view of another version of a sealing apparatus.
DESCRIPTION
The present invention relates to package sealing. Although the process is illustrated in the context of packaging a pharmaceutical formulation in a multi-layered package, the present invention can be used in other processes and should not be limited to the examples provided herein. A sealing apparatus 100 according to the present invention is shown schematically in Figure 1. The sealing apparatus comprises a platform 105 and a roller 110. The platform 105 includes a surface 115 which supports an object that is to be sealed. The roller 110 is translatable relative to the surface 115 so that the roller 110 may pass over at least a portion of the surface 115. The roller 110 includes a roller surface 120 that rolls over at least a portion of the object on the surface 115. In one version, the roller 110 includes a heating element 125 which is capable of heating the roller surface 120 to a desired temperature. The heating element 125 may be positioned in the roller 110, as shown in Figure 1. Alternatively, the heating element 125 may be separated from but in communication with the roller 110 so as to be able to heat the roller surface 120. In one version, the sealing apparatus 100 is adapted to seal a pharmaceutical formulation within a multi-layer package, such as a blister. For example, the sealing apparatus 100 may seal a plurality of layers to one another with the pharmaceutical formulation contained between the layers. An exemplary sealing process is shown in Figures 2A through 2C. A lower layer 130 of a multi- layered package is placed on the platform surface 115. In the version shown, the lower layer 130 comprises a cavity 135 which may contain a pharmaceutical formulation. The cavity 135 is positioned within a recess 140 in the surface 115 while a rim portion 145 rests on the surface 115. The cavity 135 may be formed on the platform 105 and/or the pharmaceutical formulation may be inserted into the cavity 135 while the lower layer 130 is positioned on the surface 115. Alternatively, a lower layer 130 with a preformed cavity 135 prefilled with the pharmaceutical formulation may be positioned onto the surface 115. An upper layer 150 is then, or previously, positioned over the lower layer 130, as shown in Figure 2B. When the layers are positioned on the platform 105, the roller surface 120 is heated to a desired temperature, and the platform surface 115 is translated relative to the roller 110 to cause the roller 110 to pass over the layers. The heating and/or compression of the layers seals the layers to one another and secures the pharmaceutical formulation within the sealed multi-layered package 155.
The sealing process is further illustrated in Figures 3A and 3B, which show cross-sectional views through lines A-A of Figure 2B and B-B of Figure 2C, respectively. In Figure 3A, the lower layer 130 is positioned on the platform surface 110 with the cavity 135, which is filled with a pharmaceutical formulation, positioned within the recess 140. The upper layer 150 is positioned over the lower layer 130. Between the upper layer 150 the lower layer 130 is a sealing material that may cause a seal to be formed between the upper layer 150 and the lower layer 130 when heated and/or compressed. To seal the layers, the platform 105 is translated relative to the roller 110 in the direction shown by the arrow 160. As the layers pass between the roller 110 and the platform 105, a seal 165 is formed between the layers, for example by being formed between the rim portion 145 of the lower layer 130 and the portion of the upper layer 150 which contacts the rim portion 145. Alternatively to the configuration shown, the recess 140 may be shaped to more closely resemble the contour of the cavity 135. The roller 110 may apply compression between the upper layer 150 and the lower layer 130. For example, in one version, the separation distance, d, between the roller 110 and the platform surface 115 is less than the combined thickness of the lower layer 130 and the upper layer 150 so that the layers are compressed as they pass between the roller 110 and the surface 115. For example, the distance, d, may be from about 0 % to about 100% of the combined thickness of the layers, more preferably from about 30% to about 98%, and most preferably from about 60% to about 95%. In another version, the roller 110 may rest on the platform surface 115 and the mass of the roller 110 may serve to compress the layers together. Additionally, the roller 110 may be designed to rotate in the direction of the arrow 170. In one version, an actuator, such as a rotary motor, may be provided to cause the roller 110 to rotate. The motor may control the rotation of the roller 110 in accordance with the translation of the surface 115 relative to the roller 110. Alternatively, the motor may rotate the roller 110 to cause the translation. In another version, the roller 110 freely rotates so that the translation of the surface 115 and the friction of the object and/or the platform causes the roller 110 to rotate. In yet another version, gearing may be provided so that translation of the platform 105 causes rotation of the roller 110 or so that rotation of the roller 110 causes translation of the platform 105. In one particular version, the surface velocity is substantially zero, relative to a grounded reference. The roller 110 may comprise a heating element 125 to provide heat to the layers to facilitate the sealing process. For example, in the version shown in Figures 3A and 3B, the heating element 125 may be positioned within the roller 110. The heating element 125 is adapted to heat the roller surface 120, primarily by conducting heat through the roller 110. The heated surface 120 then contacts the layers as the layers are passed between the roller 110 and the platform 105. Accordingly, the roller surface 120 can be heated to a predetermined temperature which is determined to apply sufficient heat for a translation velocity to be used. The heating element 125 may comprise a heat generating element, such as a cylindrical resistive heater cartridge, placed within a cylindrical hole that extends along the roller's axis of rotation. The roller 110 may comprise a high heat conducting material, such as metal, in order to ensure a substantially uniform temperature profile across the roller surface 120. The roller 110 may be of any suitable radius. Preferably, the radius of the roller is selected so that the rotation of the roller 110 during a sealing process is less than about 360 degrees, and more preferably less than about 270 degrees, for temperature stability. In another version, the heating element is exterior to the roller 110. For example, the heating element may be positioned so that it transfers heat to the exterior surface of the roller surface 120, such as by convection and/or radiation.
The sealing material is positioned between the upper layer 150 and the lower layer 130 and comprises a material that can seal the upper layer 150 to the lower layer 130 when heat and/or compression is applied to the sandwiched layers. For example, in one version, the sealing material comprises a layer of heat activated sealer, such as lacquer, or polymethyl methacrylate (PMMA), or the like. The heat activated sealer may be provided on the lower surface 175 of the upper layer 150. When heated to a sufficient temperature, such as at least about 140°C, and often at least about 160°C, the heat activated sealer changes state so that when cooled, the upper layer 150 is sealed to the lower layer 130. Alternatively, the heat activated sealer may be provided on an upper surface of the lower layer 130 or may be a separate sheet positioned between the upper layer 150 and the lower layer 130. In another version, the heat activated sealer may be the material of the upper layer 150 and/or the lower layer 130. In this version, sufficient heat may be applied to melt the material between the layers so that the layers may be fused to one another upon cooling. The roller 110 may provide compression to the heat activated sealer during the sealing process to more evenly distribute the sealer and/or to help bond the upper layer 150 to the lower layer 130. Alternatively, the sealing material may comprise an adhesive or bonding material that does not require heat to activate. Accordingly, in this version, the roller 110 may be used to compress the layers and improve the sealing of the layers. It has been discovered that the sealing apparatus 100 of the present invention provides for advantageous sealing of multi-layered packages. For example, the use of a roller 110 that is translatable relative to a platform surface 115 is advantageous over a flat compression and/or heating member that uniformly or substantially uniformly engages the upper layer 150. As can be seen in Figure 3B, the roller surface 120 contacts only a portion of the upper layer 150. The contact portion, c, is the portion of the upper layer 150 that contacts the roller surface 120. This contact portion, c, has a length that is less than the length of the upper layer 150. This shortened contact portion assures that a greater percentage of the surface is compressed, and the sealing material is more evenly distributed across the sealing area. As a result, the effects of material discontinuities or imperfections are minimized.
Furthermore, it has been determined that high temperatures can adversely affect some pharmaceutical formulations. For example, some pharmaceutical formulations undergo degradation when exposed to temperatures of about 100°C or greater, and others are at least partially altered when exposed to temperatures of about 80°C or greater. High temperatures have been found to be particularly undesirable for powdered pharmaceutical formulations that are to be aerosolized in that the elevated temperature may lead to agglomerations and less than desirable aerosol performance and/or may lead to morphological degradation. In addition, excessive heat can morphologically change other types of pharmaceutical formulations. It has been discovered that localized heating of a portion of the layers to be sealed, such as by using a roller 110 comprising a heating element 125, unexpectedly lowers the temperature of the cavity 135 during the sealing process and thereby lowers the temperature experienced by a pharmaceutical formulation within the cavity 135 during the sealing process when compared to a uniform heating process. Additionally, it has been unexpectedly discovered that a higher sealing temperature can be used without significantly raising the temperature of the cavity 135 when using the present sealing apparatus 100.
In one version, the sealing apparatus 100 may be used to seal a multi-layered package around a pharmaceutical formulation that is susceptible to degradation and/or reduced aerosol performance when exposed to excessive amounts of moisture. For example, the multi-layered package may comprise one or more layers that compπse a moisture barrier material. The moisture barrier material comprises one or more metals, such as aluminum, or the like and/or other moisture barrier matenals, such as polyamides, poly vinyl chlorides and the like. The moisture barrier may be provided below and above the pharmaceutical formulation to provide additional moisture protection. For example, as shown in the version of Figure 4, the multi-layered package 155 may compπse a lower layer 130 comprising a metal containing layer 180 and an upper layer 150 comprising a metal containing layer 185. The metal containing layers 180, 185 may be sufficiently thick to substantially prevent a significant amount of moisture from passing therethrough. For example, the metal containing layers 180, 185 may be from about 10 μm to about 100 μm, and more preferably from about 20 μm to about 80 μm. The lower layer 130 and the upper layer 150 are sealed together by a layer of sealing mateπal, such as a layer of lacquer that may be from about 1 μm to about 20 μm. Within the cavity 135 is a pharmaceutical formulation, such as a pharmaceutical formulation in dry powder form 195 that may be aerosolized. Alternatively, the pharmaceutical formulation may be in capsule, pill, elixir, or the like form. The lower layer 130 and/or the upper layer 150 of the multi-layered package 155 may optionally include additional materials that serve to improve the sealing or moldabi ty of the layers. For example, Figure 5 shows a particular version of a multi-layered package 155 useful in providing a moisture barrier package for a pharmaceutical formulation. In this version, the lower layer 130 compπses a first layer 200 compπsing polymeπc mateπal, such as polyvinyl chloπde, and having a thickness of about 60 μm, a second layer 205 compπsing a polyamide, such as nylon, and having a thickness of about 25 μm, a third layer 210 compπsing a metal, such as aluminum, and having a thickness of about 60 μm, and a fourth layer 215 comprising a polymeric material, such as polyvinyl chloride, and having a thickness of about 60 μm. The upper layer 150 comprises a first layer 220 comprising a metal, such as aluminum, and having a thickness of about 25 μm, and a second layer 225 comprising a sealing material, such as lacquer, and having a thickness of about 6 μm.
The moisture protection provided by the packages of Figures 4 and 5 is improved by using the present sealing apparatus 100 to seal the upper layer 150 to the lower layer 130. It has been determined that with conventional sealing techniques, a pharmaceutical formulation within the cavity is sufficiently protected from moisture for from about 15 to about 20 days. However, with the present sealing apparatus 100, the moisture protection is significantly improved. Though the precise mechanism for the improvement is unknown, it is believed that one or more of the following contributes to the added moisture protection: 1) localized compression and rolling decreases the amount of entrapped air in the seal, 2) the effects of different coefficients of expansion is less pronounced, 3) improved reorientation of the polymeric materials under localized heat and pressure, and 4) partial combination of polymeric compression, flow and recovery provided by the roller leaves voids.
It has been further discovered that by using the present sealing apparatus 100, thermal degradation of a pharmaceutical formulation within a cavity 135 is reduced. As shown in Figure 6A, the use of a roller 110 comprising a heating element 125 localizes the application of heat to a particular portion along the length of the multi-layered package 155. The temperature of the multi-layered package 155 is at a maximum at the contact portion, c, and is sharply reduced at the portions not directly in contact with the roller 110. In one version, for a cavity that is from about 0.4 inches to about 0.5 inches in length, the contact portion may be from about 0.1 to about 1.0 inches, more preferably from about .05 to about 0.4 inches, more preferably from about 0.8 inches to about 0.20 inches, and most preferably about 0.12 inches. For different sized cavities, the contact portion may be altered accordingly. As shown in Figure 6B, heat that is applied to the rim portion 145 of a multi-layered package is conducted 250 to the cavity 135 where it exposes the pharmaceutical formulation to heat. This conduction of heat is particularly pronounced when one or more of the layers 130, 150 comprises a metal-containing layer. By providing localized heating with the sealing apparatus 100, the resulting conduction is reduced. During a test process, the temperature during the sealing process was taken at four points on the multi-layered package 155: on the rim portion and spaced from the cavity 135, Tj; within the cavity 135 and in proximity to the rim portion 145, T2; within the cavity 135 and below the level of a pharmaceutical formulation, T3; and at the deepest portion of the cavity 135, T4. The temperature of a roller 110 having a radius of about 2 inches was set to 180°C and the platform 105 and roller 110 were translated 160 at a velocity of about 0.8 inches/second to seal the multi-layered package shown in Figure 5 having a cavity with a length of about 0.45 inches and depth of about 0.1 inches The resulting temperature curves at the four points during the sealing process are shown in Figure 6C. As can be seen, Ti reaches a maximum of about 140°C when in contact with the roller 110, but the heat quickly dissipates as the roller 110 progresses beyond the point. The local relatively high temperatures quickly diffuse throughout the layers to achieve an average temperature that is a reduced value. As a result of the shortened heating period at points along the rim portion 145, the heat conducted to the cavity 135 is reduced, and the temperatures within the cavity, T2, T3, T , are held below about 65°C and do not significantly alter a pharmaceutical formulation within the cavity 135.
This reduction in heating profiles is illustrated in Figures 7A through 7D which compare the temperatures during sealing using the localized heating provided by the present sealing apparatus 100 with the temperatures during sealing using an apparatus that uniformly heats the top of the multi-layered package 155. The uniform heating process was carried out using a sealing plate heated to about 170°C that contacts the multi-layered package 155 for about 0.6 seconds. As can be seen in Figure 7 A, the maximum temperature reached at Ti is significantly less using the process according to the present invention than the temperature at Ti using the uniform heating process, and the high temperatures are maintained for significantly less time using the present process. The lower maximum temperature and the shortened time provide less heat for conduction to the cavity 135, and as a result the temperatures in the cavity 135 are reduced. For example, as shown in Figure 7B, the temperature at T2 for the uniform heating process is above 100°C for a significant duration of the sealing process. Temperatures about 100°C are damaging to some pharmaceutical formulations. As further shown in Figures 7C and 7D, the cavity temperatures even deeper within the cavity approach or reach 100°C for the uniform heating process. In contrast, the localized heating using the process of the present invention results in cavity temperatures below about 65°C, thereby providing the ability to package pharmaceutical formulations that undergo heat damage at temperatures thereabove. In addition, it has been determined that the heat damage to a pharmaceutical formulation within the cavity 135 can be further reduced by provided a space between the top of the pharmaceutical formulation and the upper layer 150. This prevents heat from passing directly from the upper layer 150 to the pharmaceutical formulation.
Unexpectedly, the quality of the sealing of the multi-layered package 155 is improved using the sealing apparatus 100 of the present invention. For example, as shown in Figure 8, which shows a graph of an Instron test of the seal strength of a multi-layered package sealed according to the present process 270 with four sampled multi-layered packages sealed according to the uniform heating process described above. Even though the roller 110 in the present process was maintained at a lower temperature than the sealing plate of the uniform heating process and even though the maximum temperature reached along the rim portion 145 is lower with the present process, the strength of the seal is higher. Accordingly, with the present process, an improved seal is achieved while also preventing undesired alteration of a pharmaceutical formulation being packaged. An additional unexpected result of the present invention is illustrated in Figure 9 which shows contours of the peak cavity temperatures as a function of roller temperature and contact time (the length of the contact portion, c, divided by the velocity of translation of the roller). As can be seen, the peak cavity temperature is more affected by contact time than by roller temperature. Accordingly, assuming the contact time is held sufficiently low, very high roller temperatures may be employed without adversely heating the cavity 135. Also, Figure 9 demonstrates that the process is unexpectedly easy to control since contact time may be a more controllable variable than roller temperature. A particular version of a sealing apparatus 100 is shown in Figure 10. In this version, a stage 300 is provided to support the platform 105 and the roller 110 and to provide for translation and/or rotation between the platform 105 and the roller 110. In this version, the platform 105 is removably insertable onto a top surface 305 of the stage 300. On the top surface is one or more indexing members 310 that receive the platform 105 to assure proper alignment of the platform 105 on the stage 300. The stage 300 also comprises one or more guide rails 315. The guide rails support a roller carrier 320 so that the roller carrier 230 may translate relative to the top surface 305 of the stage 300. The roller carrier 320 comprises one or more roller supporting members 325. In the version shown, two roller supporting members 325 have a through hole 330 for rotatably receiving an extension 335 of the roller 310. The roller carrier 320 may also comprise an opening 340 through which the bottom portion of the roller 110 may extend. In one version, the size and thickness of the opening 340 is selected so that substantially only the contact area, c, portion of the roller surface 120 extends below side panels 345 of the roller carrier 320. In this way, the side panels 345 serve as a heat shield to aid in localizing the application of heat to the contact area, c. Accordingly, when a multi-layer package is positioned on the surface 115 of the platform 105 and when the platform 105 is positioned on the stage 300, the roller surface 120 contacts the multi-layered package to seal the layers, as discussed above. This contact may be provided by positioning the roller 110 a predetermined distance above the top surface 305 of the stage 300 or above the surface 115 of the platform 105. Alternatively, the contact may be provided by providing a mechanism, such as a spring, that biases the platform 105 toward the roller 110 or that biases the roller 110 toward the stage 300. The spring may be sized and shaped to provide a predetermined amount of pressure to be applied to the package. Alternatively, the amount of pressure may be controlled by selection of size and/or weight of the roller 110. In another version, the platform 105 may be pivotably connected to the stage 300 so that the platform 105 may pivot about an axis parallel to its longitudinal axis. In this way, misalignment between the roller 110 and the platform 105 may be accommodated. Alternatively, the roller 110 may be able to pivot. The platform 105 may have a surface 115 having one or more recesses 140 therein. For example, in the version of Figure 10, a lower layer 130 having a formed cavity 135 may be positioned on the surface 115 so that the cavity 135 is positioned within the recess. Alternatively, the recess may be used as a mold by which the cavity 135 may be formed, such as by cold forming. In another version, a plurality of recesses 140 are provided in the platform, as shown in Figure 11 A. In this version, the roller 110 is sufficiently wide to contact two or more multi-layered packages positioned on the platform 105. In another version, an array of recesses 140 may be provided, as shown in Figure 1 IB. In this version, the translation of the roller 110 along the platform 105 extends a sufficient length to contact an array of multi-layered packages that are positioned on the platform 105. In another version, the platform 105 may comprise an array of recesses, and the roller 110 may be adapted to only seal a portion of the array. The balance of the recesses may be sealed by one or more additional rollers or by the first roller making one or more additional passes across the array. The platform 105 may be positionable on the stage 300 by a mechanism, such as a robotic mechanism, or may be positioned by hand. Alternatively, the platform 105 may be fixed to the stage 300, and the multi-layered package or an array of multi-layered packages may be positioned onto the platform 105 by a mechanism or by hand. The surface 115 may be made of a material selected so that the roller 110 provides a predetermined amount of pressure on the multi-layered package. For example, the surface may be made of a material having a durometer of from about 10 to about 100. In one version, the surface comprises a fluoroelastomer, such as Viton ™ available from E.I. Dupont de Nemours, having a durometer of about 70. The Viton™ surface is also advantageous in that is offers excellent heat resistance. In one version, the surface 115 may be substantially flat to provide ease in indexing and more precise control of the relative movements.
The relative rotation and/or translation of the roller 110 and the platform 105 may be controlled by a controller 350, as shown for example in Figures 12 and 13. In the version of Figure 12, a rotary motor 360 is provided on a roller support member 325 in a manner where it may rotatably engage the roller 110, such as by receiving and engaging the extension 335. The motor 360 may be cause rotation of the extension 335 and thereby cause rotation of the roller 110. The controller 350 is in communication with the motor 360 and is adapted to control the operation of the roller 110, such as by causing the roller to rotate at a predetermined rotational velocity. In this way, the rotation of the roller 110 may drive the translation of the roller 110 relative to the platform 105 by causing the roller carrier 320 to slide along the guide rails 315. In another version, the translation of the roller 110 may be provided by a motor 370 that forces the roller carrier 320 to slide along the guided rails 315, as shown in Figure 13. Alternatively, a linear motor may be provided that acts directly on the roller carrier 320. In the version shown, the motor 370 is a rotary motor that rotates a drive shaft 375 which in engages a projection 380 extending from the roller carrier 110 in a manner that translates rotation of the drive shaft 375 into translation of the projection 380, such as by providing teeth and grooves on respective members. In this version, the roller 110 may be freely rotatable within the roller support 325 so that the translation of the roller carrier 320 and the resulting friction between the roller surface 120 and the multi-layered package causes the rotation of the roller 110. The controller 350 may control the motor 370 of the version of Figure 13 in order to control the velocity of the translation. In another version, both the rotation of the roller 110 and the translation of the roller 110 relative to the platform 105 may be controlled. This version is advantageous in that there are reduced stresses applied to the components and/or to the package. Alternatively, the roller 110 may be translated relative to the platform 105 by hand. A variety of motors which are available in the commercial market are suitable for use. the motors may include one or more of stepper motors, servo motors, pneumatic actuators, etc. In addition, the motors may also provide input to the controller 350 by sensing the position of the roller 110 or the roller carrier 320 in order to provide added control to the process. Such sensors can include encoded wheel transducers, potentiometers, etc. Hybrid or bidirectional transducers often pair input and output functions together. In addition, a temperature sensor may be provided. The temperature sensor may be adapted to detect the temperature of the roller surface 120 or other surface. The temperature sensor may be in communication with the controller 350 and the controller may control the sealing process in accordance with the detected temperature.
The controller 350 may control the operation of the sealing apparatus 100 as discussed above. Although the controller 350 has been illustrated by way of an exemplary single controller device to simplify the description of present invention, it should be understood that the controller 350 may be a plurality of controller devices that may be connected to one another or a plurality of controller devices that may be connected to different components of the sealing apparatus 100. In one embodiment, the controller 350 comprises electronic hardware including electrical circuitry comprising integrated circuits that is suitable for operating or controlling the sealing apparatus 100. Generally, the controller 350 is adapted to accept data input, run algorithms, produce useful output signals, and may also be used to detect data signals from one or more sensors and other device components, and to monitor or control the process in the sealing apparatus 100. However, the controller 350 may merely perform one of these tasks. In one version, the controller 350 may comprise one or more of (i) a computer comprising a central processor unit (CPU) which is interconnected to a memory system with peripheral control components, (ii) application specific integrated circuits (ASICs) that operate particular components of the sealing apparatus 100 or operate a particular process, and (iii) one or more controller interface boards along with suitable support circuitry. Typical CPUs include the PowerPC™, Pentium™, and other such processors. The ASICs are designed and preprogrammed for particular tasks, such as retrieval of data and other information from the sealing apparatus 100 and/or operation of particular device components. Typical support circuitry includes for example, coprocessors, clock circuits, cache, power supplies and other well known components that are in communication with the CPU. For example, the CPU often operates in conjunction with a random access memory (RAM), a read-only memory (ROM) and other storage devices well known in the art. The RAM can be used to store the software implementation of the present invention during process implementation. The programs and subroutines of the present invention are typically stored in mass storage devices and are recalled for temporary storage in RAM when being executed by the CPU.
The software implementation and computer program code product of the present invention may be stored in a memory device, such as an EPROM, and called into RAM during execution by the controller 350. The computer program code may be written in conventional computer readable programming languages, such as for example, assembly language, C, C", Pascal, or native assembly. Suitable program code is entered into a single file, or multiple files, using a conventional text editor and stored or embodied in a computer-usable medium, such as a memory of the computer system. If the entered code text is in a high level language, the code is compiled to a compiler code which is linked with an object code of precompiled windows library routines. To execute the linked and compiled object code, the system user invokes the object code, causing the computer system to load the code in memory to perform the tasks identified in the computer program. In one version, the controller 350 may comprise a microprocessor or
ASIC of sufficiently small size and power consumption to be housed on or in the aerosolization device 100. For example, suitable microprocessors for use as a local microprocessor include the MC68HC711E9 by Motorola, the PIC16C74 by Microchip, and the 82930AX by Intel Corporation. The microprocessor can include one microprocessor chip, multiple processors and/or co-processor chips, and/or digital signal processor (DSP) capability.
In one version, the sealing apparatus 100 is adapted to seal a dry powder pharmaceutical formulation with the cavity 135 of a multi-layered package. In one particular version, at least a portion of the dry powder pharmaceutical formulation directly contacts the bottom layer 130 of the package, in which case it may be important to prevent the bottom layer 130 from reaching excessive temperatures. Alternatively, a material, such as a capsular container may be provided between the dry powder pharmaceutical formulation and the lower layer 130 of the package. In this case it may also be necessary to prevent excessive heat in the cavity because the heat may be conducted through the material and to the pharmaceutical formulation. The cavity 135 may contain the pharmaceutical formulation in a form where it may be aerosolized for inhalation by the user. For example, when in a powdered form, the powder may be initially stored in the sealed package, which is opened prior to aerosolization of the powder, as described in U.S. Patent 5,785,049, U.S. Patent 5,415,162, and U.S. Patent Application 09/583,312. Alternatively the powder may be contained in a capsule, as described in U.S. Patent 4,995,385, U.S. Patent 3,991,761, U.S. Patent 6,230,707, and PCT Publication WO 97/27892, the capsule being openable before, during, or after insertion of the capsule into an aerosolization device. In either the bulk, blister, capsule, or the like form, the powder may be aerosolized by an active element, such as compressed air, as described in US Patent 5,458,135, U.S. Patent 5,785,049, and U.S. Patent 6,257,233, or propellant, as described in US Patent Application 09/556,262, filed on April 24, 2000, and entitled "Aerosolization Apparatus and Methods", and in PCT Publication WO 00/72904. Alternatively the powder may be aerosolized in response to a user's inhalation, as described for example in the aforementioned US Patent Application 09/583,312 and U.S. Patent 4,995,385. All of the above references being incorporated herein by reference in their entireties.
In a preferred version, the invention provides a system and method for aerosolizing a pharmaceutical formulation and delivering the pharmaceutical formulation to the lungs of the user. The pharmaceutical formulation may comprise powdered medicaments, liquid solutions or suspensions, and the like, and may include an active agent.
The active agent described herein includes an agent, drug, compound, composition of matter or mixture thereof which provides some pharmacologic, often beneficial, effect. This includes foods, food supplements, nutrients, drugs, vaccines, vitamins, and other beneficial agents. As used herein, the terms further include any physiologically or pharmacologically active substance that produces a localized or systemic effect in a patient. An active agent for incorporation in the pharmaceutical formulation described herein may be an inorganic or an organic compound, including, without limitation, drugs which act on: the peripheral nerves, adrenergic receptors, cholinergic receptors, the skeletal muscles, the cardiovascular system, smooth muscles, the blood circulatory system, synoptic sites, neuroeffector junctional sites, endocrine and hormone systems, the immunological system, the reproductive system, the skeletal system, autacoid systems, the alimentary and excretory systems, the histamine system, and the central nervous system. Suitable active agents may be selected from, for example, hypnotics and sedatives, psychic energizers, tranquilizers, respiratory drugs, anticonvulsants, muscle relaxants, antiparkinson agents (dopamine antagnonists), analgesics, anti-inflammatories, antianxiety drugs (anxiolytics), appetite suppressants, antimigraine agents, muscle contractants, anti-infectives (antibiotics, antivirals, antifungals, vaccines) antiarthritics, antimalarials, antiemetics, anepileptics, bronchodilators, cytokines, growth factors, anti-cancer agents, antithrombotic agents, antihypertensives, cardiovascular drugs, antiarrhythmics, antioxicants, anti-asthma agents, hormonal agents including contraceptives, sympathomirnetics, diuretics, lipid regulating agents, antiandrogenic agents, antiparasitics, anticoagulants, neoplasties, antineoplastics, hypoglycemics, nutritional agents and supplements, growth supplements, antienteritis agents, vaccines, antibodies, diagnostic agents, and contrasting agents. The active agent, when administered by inhalation, may act locally or systemically.
The active agent may fall into one of a number of structural classes, including but not limited to small molecules, peptides, polypeptides, proteins, polysaccharides, steroids, proteins capable of eliciting physiological effects, nucleotides, oligonucleotides, polynucleotides, fats, electrolytes, and the like.
Examples of active agents suitable for use in this invention include but are not limited to one or more of calcitonin, erythropoietin (EPO), Factor VIII, Factor IX, ceredase, cerezyme, cyclosporin, granulocyte colony stimulating factor (GCSF), thrombopoietin (TPO), alpha- 1 proteinase inhibitor, elcatonin, granulocyte macrophage colony stimulating factor (GMCSF), growth hormone, human growth hormone (HGH), growth hormone releasing hormone (GHRH), heparin, low molecular weight heparin (LMWH), interferon alpha, interferon beta, interferon gamma, interleukin-1 receptor, interleukin-2, interleukin-1 receptor antagonist, interleukin-3, interleukin-4, interleukin-6, luteinizing hormone releasing hormone (LHRH), factor IX, insulin, pro-insulin, insulin analogues (e.g., mono-acylated insulin as described in U.S. Patent No. 5,922,675, which is incorporated herein by reference in its entirety), amylin, C-peptide, somatostatin, somatostatin analogs including octreotide, vasopressin, follicle stimulating hormone (FSH), insulin-like growth factor (IGF), insulintropin, macrophage colony stimulating factor (M-CSF), nerve growth factor (NGF), tissue growth factors, keratinocyte growth factor (KGF), glial growth factor (GGF), tumor necrosis factor (TNF), endothelial growth factors, parathyroid hormone (PTH), glucagon-like peptide thymosin alpha 1, Ilb/IIIa inhibitor, alpha-1 antitrypsin, phosphodiesterase (PDE) compounds, VLA-4 inhibitors, bisphosponates, respiratory syncytial virus antibody, cystic fibrosis transmembrane regulator (CFTR) gene, deoxyreibonuclease (Dnase), bactericidal/permeability increasing protein (BPI), anti-CMV antibody, 13-cis retinoic acid, macrolides such as erythromycin, oleandomycin, troleandomycin, roxithromycin, clarithromycin, davercin, azithromycin, flurithromycin, dirithromycin, josamycin, spiromycin, midecamycin, leucomycin, miocamycin, rokitamycin, andazithromycin, and swinolide A; fluoroquinolones such as ciprofloxacin, ofloxacin, levofloxacin, trovafloxacin, alatrofloxacin, moxifloxicin, norfloxacin, enoxacin, grepafloxacin, gatifloxacin, lomefloxacin, sparfloxacin, temafloxacin, pefloxacin, amifloxacin, fleroxacin, tosufloxacin, prulifloxacin, irloxacin, pazufloxacin, clinafloxacin, and sitafloxacin, aminoglycosides such as gentamicin, netilmicin, paramecin, tobramycin, amikacin, kanamycin, neomycin, and streptomycin, vancomycin, teicoplanin, rampolanin, mideplanin, colistin, daptomycin, gramicidin, colistimethate, polymixins such as polymixin B, capreomycin, bacitracin, penems; penicillins including penicllinase-sensitive agents like penicillin G, penicillin V, penicillinase-resistant agents like methicillin, oxacillin, cloxacillin, dicloxacillin, floxacillin, nafcillin; gram negative microorganism active agents like ampicillin, amoxicillin, and hetacillin, cillin, and galampicillin; antipseudomonal penicillins like carbenicillin, ticarcillin, azlocillin, mezlocillin, and piperacillin; cephalosporins like cefpodoxime, cefprozil, ceftbuten, ceftizoxime, ceftriaxone, cephalothin, cephapirin, cephalexin, cephradrine, cefoxitin, cefamandole, cefazolin, cephaloridine, cefaclor, cefadroxil, cephaloglycin, cefuroxime, ceforanide, cefotaxime, cefatrizine, cephacetrile, cefepime, cefixime, cefonicid, cefoperazone, cefotetan, cefmetazole, ceftazidime, loracarbef, and moxalactam, monobactams like aztreonam; and carbapenems such as imipenem, meropenem, pentamidine isethiouate, albuterol sulfate, lidocaine, metaproterenol sulfate, beclomethasone diprepionate, triamcinolone acetamide, budesonide acetonide, fluticasone, ipratropium bromide, flunisolide, cromolyn sodium, ergotamine tartrate and where applicable, analogues, agonists, antagonists, inhibitors, and pharmaceutically acceptable salt forms of the above. In reference to peptides and proteins, the invention is intended to encompass synthetic, native, glycosylated, unglycosylated, pegylated forms, and biologically active fragments and analogs thereof.
Active agents for use in the invention further include nucleic acids, as bare nucleic acid molecules, vectors, associated viral particles, plasmid DNA or RNA or other nucleic acid constructions of a type suitable for transfection or transformation of cells, i.e., suitable for gene therapy including antisense. Further, an active agent may comprise live attenuated or killed viruses suitable for use as vaccines. Other useful drugs include those listed within the Physician's Desk Reference (most recent edition).
The amount of active agent in the pharmaceutical formulation will be that amount necessary to deliver a therapeutically effective amount of the active agent per unit dose to achieve the desired result. In practice, this will vary widely depending upon the particular agent, its activity, the severity of the condition to be treated, the patient population, dosing requirements, and the desired therapeutic effect. The composition will generally contain anywhere from about 1% by weight to about 99% by weight active agent, typically from about 2% to about 95% by weight active agent, and more typically from about 5% to 85% by weight active agent, and will also depend upon the relative amounts of additives contained in the composition. The compositions of the invention are particularly useful for active agents that are delivered in doses of from 0.001 mg/day to 100 mg/day, preferably in doses from 0.01 mg/day to 75 mg/day, and more preferably in doses from 0.10 mg/day to 50 mg/day. It is to be understood that more than one active agent may be incorporated into the formulations described herein and that the use of the term "agent" in no way excludes the use of two or more such agents.
The pharmaceutical formulation may comprise a pharmaceutically acceptable excipient or carrier which may be taken into the lungs with no significant adverse toxicological effects to the subject, and particularly to the lungs of the subject. In addition to the active agent, a pharmaceutical formulation may optionally include one or more pharmaceutical excipients which are suitable for pulmonary administration. These excipients, if present, are generally present in the composition in amounts ranging from about 0.01 % to about 95% percent by weight, preferably from about 0.5 to about 80%, and more preferably from about 1 to about 60% by weight. Preferably, such excipients will, in part, serve to further improve the features of the active agent composition, for example by providing more efficient and reproducible delivery of the active agent, improving the handling characteristics of powders, such as flowability and consistency, and/or facilitating manufacturing and filling of unit dosage forms. In particular, excipient materials can often function to further improve the physical and chemical stability of the active agent, minimize the residual moisture content and hinder moisture uptake, and to enhance particle size, degree of aggregation, particle surface properties, such as rugosity, ease of inhalation, and the targeting of particles to the lung. One or more excipients may also be provided to serve as bulking agents when it is desired to reduce the concentration of active agent in the formulation.
Pharmaceutical excipients and additives useful in the present pharmaceutical formulation include but are not limited to amino acids, peptides, proteins, non-biological polymers, biological polymers, carbohydrates, such as sugars, derivatized sugars such as alditols, aldonic acids, esterified sugars, and sugar polymers, which may be present singly or in combination. Suitable excipients are those provided in WO 96/32096, which is incorporated herein by reference in its entirety. The excipient may have a glass transition temperatures (Tg) above about 35° C, preferably above about 40 °C, more preferably above 45° C, most preferably above about 55 °C.
Exemplary protein excipients include albumins such as human serum albumin (HSA), recombinant human albumin (rHA), gelatin, casein, hemoglobin, and the like. Suitable amino acids (outside of the dileucyl-peptides of the invention), which may also function in a buffering capacity, include alanine, glycine, arginine, betaine, histidine, glutamic acid, aspartic acid, cysteine, lysine, leucine, isoleucine, valine, methionine, phenylalanine, aspartame, tyrosine, tryptophan, and the like. Preferred are amino acids and polypeptides that function as dispersing agents. Amino acids falling into this category include hydrophobic amino acids such as leucine, valine, isoleucine, tryptophan, alanine, methionine, phenylalanine, tyrosine, histidine, and proline. Dispersibility- enhancing peptide excipients include dimers, trimers, tetramers, and pentamers comprising one or more hydrophobic amino acid components such as those described above.
Carbohydrate excipients suitable for use in the invention include, for example, monosaccharides such as fructose, maltose, galactose, glucose, D- mannose, sorbose, and the like; disaccharides, such as lactose, sucrose, trehalose, cellobiose, and the like; polysaccharides, such as raffinose, melezitose, maltodextrins, dextrans, starches, and the like; and alditols, such as mannitol, xylitol, maltitol, lactitol, xylitol sorbitol (glucitol), pyranosyl sorbitol, myoinositol and the like.
The pharmaceutical formulation may also include a buffer or a pH adjusting agent, typically a salt prepared from an organic acid or base.
Representative buffers include organic acid salts of citric acid, ascorbic acid, gluconic acid, carbonic acid, tartaric acid, succinic acid, acetic acid, or phthalic acid, Tris, tromethamine hydrochloride, or phosphate buffers.
The pharmaceutical formulation may also include polymeric excipients/additives, e.g., polyvinylpyrrolidones, derivatized celluloses such as hydroxymethylcellulose, hydroxyethylcellulose, and hydroxypropylmethylcellulose, Ficolls (a polymeric sugar), hydroxyethylstarch, dextrates (e.g., cyclodextrins, such as 2-hydroxypropyl-β-cyclodextrin and sulfobutylether-β-cyclodextrin), polyethylene glycols, and pectin. The pharmaceutical formulation may further include flavoring agents, taste-masking agents, inorganic salts (for example sodium chloride), antimicrobial agents (for example benzalkonium chloride), sweeteners, antioxidants, antistatic agents, surfactants (for example polysorbates such as 'TWEEN 20" and "TWEEN 80"), sorbitan esters, lipids (for example phospholipids such as lecithin and other phosphatidylcholines, phosphatidylethanolamines), fatty acids and fatty esters, steroids (for example cholesterol), and chelating agents (for example EDTA, zinc and other such suitable cations). Other pharmaceutical excipients and/or additives suitable for use in the compositions according to the invention are listed in "Remington: The Science & Practice of Pharmacy", 19th ed., Williams & Williams, (1995), and in the "Physician's Desk Reference", 52nd ed., Medical Economics, Montvale, NJ (1998), both of which are incorporated herein by reference in their entireties.
"Mass median diameter" or "MMD" is a measure of mean particle size, since the powders of the invention are generally polydisperse (i.e., consist of a range of particle sizes). MMD values as reported herein are determined by centrifugal sedimentation, although any number of commonly employed techniques can be used for measuring mean particle size. "Mass median aerodynamic diameter" or "MMAD" is a measure of the aerodynamic size of a dispersed particle. The aerodynamic diameter is used to describe an aerosolized powder in terms of its settling behavior, and is the diameter of a unit density sphere having the same settling velocity, generally in air, as the particle. The aerodynamic diameter encompasses particle shape, density and physical size of a particle. As used herein, MMAD refers to the midpoint or median of the aerodynamic particle size distribution of an aerosolized powder determined by cascade impaction.
In one version, the powdered formulation for use in the present invention includes a dry powder having a particle size selected to permit penetration into the alveoli of the lungs, that is, preferably 10 μm mass median diameter (MMD), preferably less than 7.5 μm, and most preferably less than 5 μm, and usually being in the range of 0.1 μm to 5 μm in diameter. The delivered dose efficiency (DDE) of these powders may be greater than 30%, more preferably greater than 40%, more preferably greater than 50% and most preferably greater than 60% and the aerosol particle size distribution is about 1.0 - 5.0 μm mass median aerodynamic diameter (MMAD), usually 1.5 - 4.5 μm MMAD and preferably 1.5 - 4.0 μm MMAD. These dry powders have a moisture content below about 10% by weight, usually below about 5% by weight, and preferably below about 3% by weight. Such powders are described in WO 95/24183, WO 96/32149, WO 99/16419, and WO 99/16422, all of which are all incorporated herein by reference in their entireties. Although the present invention has been described in considerable detail with regard to certain preferred versions thereof, other versions are possible, and alterations, permutations and equivalents of the version shown will become apparent to those skilled in the art upon a reading of the specification and study of the drawings. For example, the relative positions of the elements in the expedients for carrying out the relative movements may be changed. Also, the various features of the versions herein can be combined in various ways to provide additional versions of the present invention. Furthermore, certain terminology has been used for the purposes of descriptive clarity, and not to limit the present invention. For example, the use of the terms "upper" and "lower" may be reversed in the specification. Therefore, the appended claims should not be limited to the description of the preferred versions contained herein and should include all such alterations, permutations, and equivalents as fall within the true spirit and scope of the present invention.

Claims

What is claimed is:
1. An apparatus for sealing a first layer to a second layer, the second layer comprising one or more cavities adapted to contain a pharmaceutical formulation, the apparatus comprising: a roller comprising a heating element; and a surface adapted to support the first and second layers, the surface being translatable relative to the roller; whereby the first layer may be heat sealed to the second layer when contacted by the roller to contain the pharmaceutical formulation within the one or more cavities.
2. An apparatus according to claim 1 wherein at least a portion of the surface is substantially flat.
3. An apparatus according to claim 1 wherein the surface comprises one or more recesses adapted to contain the one or more cavities.
4. An apparatus for sealing a first layer to a second layer, the second layer comprising one or more cavities adapted to contain a pharmaceutical formulation, the apparatus comprising: a roller comprising a heating element; and a surface adapted to support the second layer, wherein at least a portion of the surface is substantially flat; whereby the first layer may be heat sealed to the second layer when contacted by the roller to contain the pharmaceutical formulation within the one or more cavities.
5. An apparatus according to claim 4 wherein the surface comprises one or more recesses adapted to contain the one or more cavities.
6. A method of sealing a package, the method comprising: providing a first layer and a second layer on a surface, the second layer comprising one or more cavities containing a pharmaceutical formulation; compressing the layers together with a heated roller; and translating the heated roller relative to the surface, whereby the first layer may be heat sealed to the second layer when contacted by the roller to contain the pharmaceutical formulation within the one or more cavities.
7. A method according to claim 6 wherein the surface is substantially flat.
8. A method according to claim 6 wherein the first layer comprises a metal.
9. A method according to claim 6 wherein the second layer comprises a metal.
10. A method according to claim 6 wherein the first layer and the second layer each comprise a metal.
11. A method according to claim 6 wherein the pharmaceutical formulation comprises a dry powder.
12. A method according to claim 6 wherein the pharmaceutical formulation comprises an aerosolizable dry powder.
13. A method according to claim 6 wherein the pharmaceutical formulation is within a capsule.
14. A method according to claim 6 wherein the pharmaceutical formulation comprises an aerosolizable dry powder within a capsule.
15. A pharmaceutical package made by a process comprising: providing a first layer and a second layer on a surface, the second layer comprising one or more cavities containing a pharmaceutical formulation; pressing the layers together with a heated roller; and translating the heated roller relative to the surface, whereby the first layer may be heat sealed to the second layer when contacted by the roller to contain the pharmaceutical formulation within the one or more cavities.
16. A pharmaceutical package according to claim 15 wherein the surface is substantially flat.
17. A pharmaceutical package according to claim 15 wherein the first layer comprises a metal.
18. A pharmaceutical package according to claim 15 wherein the second layer comprises a metal.
19. A pharmaceutical package according to claim 15 wherein the first layer and the second layer each comprise a metal.
20. A pharmaceutical package according to claim 15 wherein the pharmaceutical formulation comprises a dry powder.
21. A pharmaceutical package according to claim 15 wherein the pharmaceutical formulation comprises an aerosolizable dry powder.
22. A pharmaceutical package according to claim 15 wherein the pharmaceutical formulation is within a capsule.
23. A pharmaceutical package according to claim 15 wherein the pharmaceutical formulation comprises an aerosolizable dry powder within a capsule.
EP02795750A 2001-12-21 2002-11-20 Apparatus and method for sealing cavities Withdrawn EP1472140A1 (en)

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US34331001P 2001-12-21 2001-12-21
US343310P 2001-12-21
PCT/US2002/038922 WO2003057564A1 (en) 2001-12-21 2002-11-20 Apparatus and method for sealing cavities

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WO (1) WO2003057564A1 (en)

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US20050051453A1 (en) 2005-03-10
AU2002360491A1 (en) 2003-07-24
JP2005514273A (en) 2005-05-19
WO2003057564A8 (en) 2004-08-26

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