Gelatin-transglutaminase hemostatic dressings and sealants
An adhesive material for medical use comprising gelatin and a non-toxic cross-linking material such as transglutaminase. An optional embodiment of the invention includes dressings in which a layer of a transglutaminase is sandwiched between a first and second layer of gelatin. The hemostatic products are useful for the treatment of wounded tissue.
1. A hemostatic or sealing dressing which comprises:
(i) a first gelatin layer; (ii) a transglutaminase layer adjacent to said first gelatin layer; and (iii) a second gelatin layer adjacent to said transglutaminase layer, wherein the transglutaminase layer is coextensive or noncoextensive with the first gelatin layer and/or the second gelatin layer; wherein said first and second gelatin layers, and said transglutaminase layer together form a patch; and wherein said gelatin layers are dried before assembling said patch.
2. The dressing of claim 1 , further comprising before said first gelatin layer, (i) a resorbable or non-resorbable material layer as said backing layer; (ii) a first gelatin layer adjacent to said material layer.
3. The hemostatic or sealing dressing of claim 1 , wherein said backing is resorbable.
4. The hemostatic or sealing dressing of claim 1 , wherein said backing is non-absorbent.
5. The hemostatic or sealing dressing of claim 1 , wherein said transglutaminase layer is arranged as a single spot, an array of spots, a single line or a plurality of lines.
6. The hemostatic or sealing dressing of claim 1 , further comprising one or more of a suitable filler, a binding agent or a solubilizing agent.
7. The hemostatic or sealing dressing of claim 1 , wherein said filler comprises at least one of maltodextrin, hydrolyzed skim milk protein or any other protein substance, sodium chloride, safflower oil, trisodium phosphate, sodium caseinate or lactose, or a combination thereof.
8. The hemostatic or sealing dressing of claim 1 , further comprising a release layer for releasing the dressing from said backing layer.
9. A hemostatic or sealing dressing which comprises: (i) a first gelatin layer; (ii) a transglutaminase layer adjacent to said first gelatin layer; (iii) a second gelatin layer adjacent to said transglutaminase layer, wherein the transglutaminase layer is coextensive or noncoextensive with the first gelatin layer and/or the second gelatin layer; and (iv) a mechanical backing layer, wherein said backing layer comprises a silicone or plastic backing; wherein said backing layer, said first and second gelatin layers, and said transglutaminase layer together form a patch; and wherein said layers are sealed so as to prevent spreading of transglutaminase or gelatin outside of the dressing.
10. The hemostatic or sealing dressing of claim 3 , wherein said resorbable material is selected from the group consisting of fibrin, keratin, collagen, gelatin, alginates, chitin, cellulose, proteoglycans, glycolic acid polymers, lactic acid polymers, or glycolic acid/lactic acid co-polymers.
11. The hemostatic or sealing dressing according to claim 1 , wherein said transglutaminase layer is dried before said layers are assembled to form said patch.
12. The dressing of claim 11 , wherein said one or more of said gelatin or transglutaminase layers is lyophilized before said layers are assembled to form said patch.
13. The dressing of claim 1 , further comprising: (iv) a mechanical backing layer.
14. The dressing of claim 13 , wherein said mechanical backing layer comprises a mesh and wherein said patch is adapted such that upon crosslinking of said gelatin, said mesh adheres to a tissue to which said patch is applied.
15. The dressing of claim 1 , wherein said layers are sealed so as to prevent spreading of transglutaminase or gelatin outside of the dressing.
16. The dressing of claim 1 , wherein said gelatin layers are lyophilized before assembling said patch.
17. A hemostatic or sealing dressing which comprises: (i) a gelatin layer; and (ii) a transglutaminase layer adjacent to said gelatin layer; wherein the transglutaminase layer is coextensive or noncoextensive with the gelatin layer; wherein said gelatin layer, and said transglutaminase layer together form a patch; and wherein said gelatin layer is lyophilized before assembling said patch.
18. A hemostatic or sealing dressing which comprises: (i) a gelatin layer; and (ii) a transglutaminase layer adjacent to said gelatin layer; wherein the transglutaminase layer is coextensive or noncoextensive with the gelatin layer; and (iii) a mesh; wherein said gelatin layer, said transglutaminase layer and said mesh together form a patch, and wherein said patch is adapted such that said mesh is adapted to adhere to a tissue to which said patch is applied.