Anhydrous hydrogel composition and delivery system

Abstract

The present disclosure relates to anhydrous hydrogels useful as mucoadhesive (oral compositions) or as topical agents and may be used to deliver an active agent such as active pharmaceutical agents (API's), coagulants, fragrances, flavors, and other actives and excipients.

Claims

1. An anhydrous hydrogel product obtained by the process of combining from 5-30% by weight NaCMC with minimal residual water, 95-70% by weight anhydrous glycerin containing 0.5% or lower residual water, 0.1-30% by weight dehydrated active agent, and followed by the addition of an energy source.

2. An anhydrous hydrogel obtained by the process of combining wherein said anhydrous hydrogel comprises from 10-20% by weight NaCMC with minimal residual water, 90-80% by weight anhydrous glycerin containing 0.5% or lower residual water, 0.1-30% by weight dehydrated active agent, and followed by the addition of an energy source.

3. An anhydrous hydrogel obtained by the process of combining from 14-16% by weight NaCMC with minimal residual water, 86-84% by weight anhydrous glycerin containing 0.5% or lower residual water, 0.1-30% by weight dehydrated active agent, and followed by the addition of an energy source.

4. An anhydrous hydrogel product according to claim 1 wherein the energy source is heat or radiation.

5. An anhydrous hydrogel product according to claim 2 wherein the energy source is heat or radiation.

6. An anhydrous hydrogel product according to claim 3 wherein the energy source is heat or radiation.

Description

DETAILED DESCRIPTION OF THE PRESENT DISCLOSURE

(1) The manufacture of the anhydrous hydrogels may be achieved using a coating line with a heat tunnel, coating a mixture of glycerin (anhydrous) with NaCMC (anhydrous) to a desired thickness and passing the mixture through an oven (under suitable dry conditions so as to retain water free atmosphere) at 105 C. (min) for about 5 minutes (min) until mixture sets. The product may be extruded into molds or thin films. Active agents and additional components are either anhydrous or dehydrated before use. Subject mixture is treated to the same processing parameters as the coating line.

(2) Preferably the composition is extruded directly onto a substrate such as a backing layer or release liner, and then pressed. The thickness of the resulting hydrogel-containing film, for most purposes, will be in the range of about 0.20 mm to about 0.80 mm, more usually in the range of about 0.37 mm to about 0.47 mm.

(3) The hydrogel compositions of the present disclosure may be prepared by solution casting, by admixing the glycerin and CMC at a concentration typically in the range of about 35% to 60% w/w followed by the addition of heat or radiation. The resulting solution is cast onto a substrate such as a backing layer or release liner. Both admixture and casting are preferably carried out at as low temperature as permitted. The substrate coated with the hydrogel film is then baked at a temperature in the range of about 80 degree C. to about 100 degree C., optimally about 90 degree C., for time period in the range of about one to four hours, optimally about two hours.

(4) An active agent may be delivered to a body surface by simply placing a hydrogel composition of the present disclosure on a body surface in active agent-transmitting relation thereto. Alternatively, an active agent-containing hydrogel composition may be incorporated into a delivery system or patch. In manufacturing such systems, the hydrogel adhesive composition may be cast or extruded onto a backing layer or release liner and will serve as the skin-contacting face of the system and act as an active agent reservoir. Alternatively, the hydrogel composition may be used as an active agent reservoir within the interior of such a system, with a conventional skin contact adhesive laminated thereto to affix the system to a patient's body surface.

(5) Optional ingredients include anti-oxidants, colorants, flavourings and flavour enhancers, preservatives, salivary stimulating agents, cooling agents, co-solvents (including oils), emollients, bulking agents, anti-foaming agents, surfactants and taste-masking agents.

(6) Films in accordance with the present disclosure are typically prepared by evaporative drying of thin aqueous films coated onto a peelable backing support or paper. This may be done in a drying oven or tunnel, typically a combined coater dryer, or by freeze-drying or vacuuming.

(7) Solid formulations for oral administration may be formulated to be immediate and/or modified release. Modified release formulations include delayed-, sustained-, pulsed-, controlled-, targeted and programmed release.

(8) Suitable modified release formulations for the purposes of the present disclosure may be adapted from those described in U.S. Pat. No. 6,106,864. Details of other suitable release technologies such as high energy dispersions and osmotic and coated particles are to be found in Pharmaceutical Technology On-line, 25(2), 1-14, by Verma et al (2001). The use of chewing gum to achieve controlled release may be adapted from those described in WO 00/35298.

(9) Systems for the topical, transdermal or transmucosal administration of an active agent may comprise: a reservoir containing a therapeutically effective amount of an active agent; an adhesive means for maintaining the system in active agent transmitting relationship to a body surface; and a backing layer as described above, wherein a disposable release liner covers the otherwise exposed surface, protecting such surface during storage and prior to use (also as described above).

(10) The composition will contain a quantity of an active agent effective to provide the desired dosage or effect over a predetermined delivery period.

(11) The compositions of the present disclosure may also include a rate-controlling membrane on the body surface side of the drug reservoir. The materials used to form such a membrane are selected to limit the flux of one or more components contained in the drug formulation, and the membrane may be either microporous or dense. Representative materials useful for forming rate-controlling membranes include polyolefins such as polyethylene and polypropylene, polyamides, polyesters, ethylene-ethacrylate copolymer, ethylene-vinyl acetate copolymer, ethylene-vinyl methylacetate copolymer, ethylene-vinyl ethylacetate copolymer, ethylene-vinyl propylacetate copolymer, polyisoprene, polyacrylonitrile, ethylene-propylene copolymer, polysiloxane-polycarbonate block copolymer and the like.

(12) The compositions of the present disclosure may also serve to deliver an active agent using other routes of administration. For example, the compositions may be formulated with excipients, carriers and the like suitable for oral administration of an orally active drug. The compositions may also be used in buccal and sublingual drug delivery, insofar as the compositions can adhere well to moist surfaces within the mouth. In buccal and sublingual systems, hydrolyzable and/or bioerodible polymers may be incorporated into the compositions to facilitate gradual erosion throughout a drug delivery period. Still other types of formulations and drug delivery platforms may be prepared using the present compositions, including implants, rectally administrable compositions, vaginally administrable compositions, and the like.

Example 1

(13) Using methods analogous to those described above the following anhydrous formulations were prepared.

(14) TABLE-US-00001 Odor Control Description A B C Glycerin (99.7%) 78.0 77.0 78.0 Sodium CMC 10.0 9.8 9.8 Zinc Oxide 0.0 0.8 0.8 Magnesium Oxide 0.0 0.5 0.5 PEG-40 HCO 10.0 10.0 10.0 Undecylenic Acid 0.5 0.5 1.0 Methyl Ester Fragrance 1.5 1.5 0.0 Total 100.0 100.0 100.0

Example 2

(15) TABLE-US-00002 Dry Mouth Description A B C Glycerin (99.7%) 74.00 78.00 78.00 Sodium CMC 18.00 q.s. q.s. Coconut Oil (for example) 7.80 5.00 5.00 CoQ10 0.20 0.00 0.00 Flouride compound 0.00 0.25-1.00 0.25-1.00 Flavor trace trace trace Total 100.0 100.0 100.0

Example 3

(16) TABLE-US-00003 Food Thickener/Gravy Description A B C Glycerin 69.00 70.00 75.00 (99.7%) Sodium 20.00 20.00 20.00 CMC Anhydrous 6.00 5.00 5.00 Coconut Oil Dehydrated 5.00 0.00 0.00 Chicken Flavor Dehydrated 0.00 5.00 0.00 Beef Flavor Total 100.0 100.0 100.0

Example 4

(17) TABLE-US-00004 Denture Fixative Gel Film Description A B C D E Glycerin q.s. q.s. q.s. q.s. q.s. (99.7%) Sodium CMC 20.00 20.00 20.00 20.00 20.00 Ca(OH).sub.2 0.140-2.54 0.140-2.54 Mg(OH).sub.2 0.100-1.82 0.100-1.82 Zn(OH).sub.2 0.180-3.40 0.180-3.40 Trivalent trace 0.00-trace cmpd.* Total 100.00 100.00 100.00 100.00 100.00

Example 5

(18) TABLE-US-00005 API Description A C Glycerin (99.7%) 78.00 80.00 Sodium CMC 17.00 20.00 anhydrous Coconut Oil 5.00 0.00 (for example) API (e.g., etanercept) 0.001-5.00% 0.001-5.00% Flavor trace trace Total 100.0 100.0

Example 6

(19) TABLE-US-00006 Polymer-Polymer Complex Denture Adhesive Anhydrous Gel Description A B C D Glycerin (99.7%) q.s. q.s. q.s. q.s. Sodium CMC 20.00-50.00 20.00-50.00 20.00-50.00 20.00-50.00 Gantrez MS-955 (CaNa Salt) 1.00-30.00 Polyvinylpyrrolidinone (PVP) K90 (anhydrous) 1.00-20.00 Polyox 301(anhydrous) 1.00-15.00 Polyvinyl alcohol (PVOH) (anhydrous) 1.00-20.00 TOTAL 100.00 100.00 100.00 100.00

(20) An example of such a kit is a so-called blister pack. Blister packs are well known in the packaging industry and are being widely used for the packaging of pharmaceutical unit dosage forms (tablets, capsules, and the like). Blister packs generally consist of a sheet of relatively stiff material covered with a foil of a preferably transparent plastic material. During the packaging process recesses are formed in the plastic foil. The recesses have the size and shape of the tablets or capsules to be packed. Next, the tablets or capsules are placed in the recesses and the sheet of relatively stiff material is sealed against the plastic foil at the face of the foil which is opposite from the direction in which the recesses were formed. As a result, the tablets or capsules are sealed in the recesses between the plastic foil and the sheet. Preferably the strength of the sheet is such that the tablets or capsules can be removed from the blister pack by manually applying pressure on the recesses whereby an opening is formed in the sheet at the place of the recess. The tablet or capsule can then be removed via said opening.

(21) All publications, including but not limited to, issued patents, patent applications, and journal articles, cited in this application are each herein incorporated by reference in their entirety.

(22) Thus, while there have been shown, described and pointed out, fundamental novel features of the present disclosure as applied to the exemplary embodiments thereof, it will be understood that various omissions and substitutions and changes in the form and details of devices and methods illustrated, and in their operation, may be made by those skilled in the art without departing from the spirit or scope of the present disclosure. Moreover, it is expressly intended that all combinations of those elements and/or method steps, which perform substantially the same function in substantially the same way to achieve the same results, are within the scope of the present disclosure. Moreover, it should be recognized that structures and/or elements and/or method steps shown and/or described in connection with any disclosed form or embodiment of the present disclosure may be incorporated in any other disclosed or described or suggested form or embodiment as a general matter of design choice. It is the intention, therefore, to be limited only as indicated by the scope of the claims appended hereto.