Debridement of bodily cavities using debridement fluids

• US 5,200,430 A
• Filed: 03/21/1991
• Issued: 04/06/1993
• Est. Priority Date: 03/21/1991
• Status: Expired due to Term

• Current Assignee: Escalon IP Holdings, Inc.
• Original Assignee: Escalon Ophthalmics Incorporated
• Inventors: Federman, Jay L.
• Primary Examiner(s): Waddell, Frederick E.
• Assistant Examiner(s): Fay, Zohreh A.
• Application Number:
  US07/672,972
• Time in Patent Office: 747 Days
• Field of Search: 424/5, 514/772
• US Class Current: 514/772
• CPC Class Codes: A61K 49/00 Preparations for testing in vivo
• CPC Class Codes: A61K 9/0026 Blood substitute; Oxygen transporting formulations; Plasma extender
• CPC Class Codes: A61K 9/0048 Eye, e.g. artificial tears

Abstract

Foreign substances may be removed from a mammalian body cavity containing an aqueous phase by injecting into the cavity a water-immiscible, optically clear, biocompatible debridement fluid to at least partially displace the aqueous phase, and removing the aqueous phase and the foreign substances. In addition, a method is provided for visualizing a transparent foreign substance in a mammalian body cavity using a water-immiscible, optically clear, biocompatible fluid having a refractive index different from that of water. The debridement fluid may also be used to reposition desirable substances, such as a lens in an ocular cavity, or to remove a secondary membrane from a cavity lining or structure. Preferably, a liquid heavier than water, such as a perfluorocarbon liquid, is used as the debridement fluid.

Claims

1. A method for removing foreign substances from a mammalian body cavity containing an aqueous phase comprising injecting into the cavity at a location near the lower portion of the cavity a water-immiscible, optically clear, biocompatible debridement fluid having a specific gravity greater than water in an amount sufficient to at least partially displace the aqueous phase, removing the aqueous phase and the foreign substances from the cavity at a location near the upper portion of the cavity and removing the debridement fluid.

2. The method according to claim 1, wherein the debridement fluid is injected in an amount sufficient to displace all of the aqueous phase.

3. The method according to claim 1, wherein the debridement fluid comprises perfluorocarbon liquid.

4. The method according to claim 3, wherein the perfluorocarbon liquid is selected from the group consisting of perfluoropentane, perfluorodimethylcyclobutane, perfluoromethylcyclopentane, perfluorohexane, perfluoromethylcyclohexane, perfluoroheptane, perfluorooctane, perfluoro-1,3-dimethylcyclohexane, perfluorodecalin, perfluoro-1-methyldecalin, perfluorotributylamine, perfluorododecahydrofluorene and perfluorotetra-decahydrophenanthrene.

5. The method according to claim 4, wherein the perfluorocarbon comprises perfluorooctane or perfluorodecalin.

6. The method according to claim 1, wherein the bodily cavity is the abdominal cavity, thoracic cavity, fallopian tube, uterine cavity, intraocular cavity, intra-articular cavity, central nervous system ventricular cavity or dural spaces.

7. The method according to claim 1, wherein the foreign substances comprise foreign cells, inflammatory cells, blood cells, tumor cells, tissue debris, sera, protein, bacteria, virus, fungi, vitreous, silicone oil or foreign bodies.

8. The method according to claim 3, further comprising perfusing the liquid perfluorocarbon with oxygen prior to injection into the cavity.

9. The method according to claim 8, further comprising repeatedly perfusing the perfluorocarbon liquid after injection into the cavity to maintain a predetermined oxygen concentration level.

10. A method for visualizing a transparent foreign substance or aqueous phase in a mammalian body cavity comprising injecting into the cavity a water-immiscible, optically clear, biocompatible fluid having a refractive index sufficiently different from the refractive index of the foreign substance or aqueous phase to cause visible refraction at the interface between the foreign substance or aqueous phase and the biocompatible fluid in an amount sufficient to at least partially surround the foreign substance, introducing visible light into the cavity and visualizing the foreign substance as an outline formed at the interface between the fluid and the transparent foreign substance or aqueous phase.

11. The method according to claim 10, wherein the fluid comprises perfluorocarbon liquid.

12. The method according to claim 11, wherein the perfluorocarbon liquid is selected from the group consisting of perfluoropentane, perfluorodimethylcyclobutane, perfluoromethylcyclopentane, perfluorohexane, perfluoromethylcyclohexane, perfluoroheptane, perfluorooctane, perfluoro-1,3-dimethylcyclohexane, perfluorodecalin, perfluoro-1-methyldecalin, perfluorotributylamine, perfluorododecahydrofluorene and perfluorotetradecahydrophenanthrene.

13. The method according to claim 10, wherein the biocompatible fluid has a refractive index at least 0.01more or less than water.

14. The method according to claim 10, wherein the body cavity is the abdominal cavity, thoracic cavity, fallopian tube, uterine cavity, intraocular cavity, intra-articular cavity, central nervous system ventricular cavity or dural spaces.

15. A method for removing foreign substances from tissue within a mammalian body cavity where the foreign substances form a layer which overlies the tissue, comprising injecting into the cavity a water-immiscible, biocompatible fluid, having a specific gravity greater than water and the tissue, in an amount sufficient to cover the tissue, and mechanically pulling the foreign substances away from the tissue.

16. The method according to claim 15, wherein the fluid comprises perfluorocarbon liquid.

17. The method according to claim 16, wherein the perfluorocarbon liquid is selected from the group consisting of perfluoropentane, perfluorodimethylcyclobutane, perfluoromethylcyclopentane, perfluorohexane, perfluoromethylcyclohexane, perfluoroheptane, perfluorooctane, perfluoro-1,3-dimethylcyclohexane, perfluorodecalin, perfluoro-1-methyldecalin, perfluorotributylamine, perfluorododecahydrofluorene and perfluorotetra-decahydrophenanthrene.

18. The method according to claim 15, wherein the tissue comprises the retina.

19. The method according to claim 15, wherein the foreign substances comprise a secondary membrane.