| abstract |
An oral patch for treating toothaches and oral lesions, including mouth ulcers (canker sores/aphthous ulcers) with water soluble topical anesthetics such as dyclonine hydrochloride. In one embodiment, the patch is made by depositing blobs of wet mixture including anesthetic, muco-adhesive hydrocolloids such as collagen, and bingers onto flat sheets. The blobs on the sheets are then dried with air convection, causing the blobs to shrink in height, forming tapered discs with rounded edges. A coating is sprayed onto one side to prevent release of the anesthetic on that side. The base sheets serve as packaging and a lid sheet may be adhered to the base sheet, such as by heat sealing with a hot platen pressing both sheets against an anvil. The platen or the anvil (or both) has recesses that prevent the discs from being pressed during sealing. The sealed package is then cut to size, such as by die cutting. |