Nylon 10/0 (to sew the cornea)
For the “last chance” operation or cornea transplant, donor tissue is needed. Specifically, we are interested in tissue with a thickness of 500–600 microns for penetrating keratoplasty. Next you need to work with this film with your hands, sew with a thin nylon thread. Then, when the cornea grows together, remove the suture. No biodegradable materials — their decay products will begin to lysing and can cause inflammation, which will exclude a positive result of the operation. Moreover, the transplant is recommended to flash twice around the perimeter — this increases the chances of its correct and uniform fixation. The second layer of nylon is most often not removed at all, because as long as it does not interfere, we don’t touch it.
But let's start from the beginning. Specifically, from situations where a person may need this difficult for Russia operation, but quite familiar in Germany. It is of three types:
- PKP, that is, the removal of the entire cornea of the patient, for example, with a diameter of 7 to 8.5 mm and sewing on a new one.
- DALK, that is, corneal tissue transplantation with the exception of the Descemet's membrane and endothelium.
- DMEK, that is, the «installation» of only the layer of the Descemet's membrane and endothelial cells instead of the same layer in a patient.