摘要:
For intrinsic dissolution testing, a drug pellet (i.e., the dissolution test sample) is retained within a cylindrical recess in a sample holder that is placed at the bottom of a dissolution vessel containing an appropriate dissolution medium with the sample holder oriented with the drug pellet facing up. During the testing cycle, the dissolution medium may be stirred, e.g., using a conventional USP 2 rotating paddle, while the sample holder (and drug pellet) remain stationary at the bottom of the vessel. The orientation of the drug pellet during testing (i.e., facing up) decreases the likelihood of retention of air bubbles formed at the surface of the drug pellet (which bubbles could otherwise decrease the effective dissolution rate), thereby providing more accurate and consistent intrinsic dissolution test results.
摘要:
Balanced pH, hyperosmotic, hypoosmotic, or isoosmotic gels are ideal vehicles for drug delivery. They are especially suited for topical body cavity or injection application of drugs or diagnostic agents; for drug or diagnostic agent delivery to the eye of a mammal; as protective corneal shields; or as ablatable corneal masks useful in laser reprofiling of the cornea. The compositions without the addition of a drug or diagnostic agent are useful as medical devices, for instance, in separating surgically or otherwise injured tissue as a means of preventing adhesions.
摘要:
Balanced pH, hyperosmotic, hypoosmotic, or isoosmotic gels are ideal vehicles for drug delivery. They are especially suited for topical body cavity or injection application of drugs or diagnostic agents; for drug or diagnostic agent delivery to the eye of a mammal; as protective corneal shields; or as ablatable corneal masks useful in laser reprofiling of the cornea. The compositions without the addition of a drug or diagnostic agent are useful as medical devices, for instance, in separating surgically or otherwise injured tissue as a means of preventing adhesions.
摘要:
Isotonic, iso-osmotic, pH balanced thermoreversible gels are ideal vehicles for drug delivery to a body cavity of a mammal. The osmolality in the gel state can be calculated by assuming that a polyoxyalkylene block copolymer or polyether present in said gel does not contribute to the osmolality in the gel state, although it does contribute to the osmolality in the liquid state.
摘要:
Balanced pH, thermo-irreversible polyoxyalkylene polymer and ionic polysaccharide gels are ideal materials for use as an ablatable mask or coating over the cornea of the eye of a mammal during excimer laser keratectomy. The depth and smoothness of the ablated corneal surface can be controlled by molding the desired surface curvature into the mask surface using a contact lens as a mold which is pressed onto the gel surface coating the cornea.