Optimized Kalinnikov-Dinh technology for effective pre-Descemet's endothelial keratoplasty (PDEK) graft preparation and preservation.

We report an optimized Kalinnikov-Dinh technology for pre-Descemet's endothelial keratoplasty (PDEK) that involves the use of a ring fixator, base, 30G needle connected to a 5-ml syringe with a spring-loaded plunger, and storage media. Our method allows to minimize graft preparation failure and preserves the PDEK graft efficiently, by reducing complications associated with the formation of type 1 big bubbles, including bubble rupture, perforation of Descemet's membrane and endothelium, and formation of type 2 or mixed type of big bubbles, and may contribute to increasing the number of surgeons performing PDEK around the globe.

[Investigation of thermal and thermo-oxidative degradation of poly(ether ether ketone) by gas chromatography].

Poly (ether ether ketone)(PEEK) was synthesized via polycondensation of hydroquinone with 4, 4'-difluorobenzophenone at 320℃ for 5 h.Thermal and thermo-oxidative degradation of PEEK was studied over a wide range of temperatures.In an inert medium, decomposition of the polymer occurred in one stage, with the formation of a coke residue accounting for approximately 50% of the original polymer mass.