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Fyodorov Eye Microsurgery Complex, Moscow, Russia. Calibrated Vacuum Ring for Intrastromal Corneal Ring Segment Implantation in Different Types of Keratectasia K. Takchidi , B. Malyugin , S. Izmaylova , I. Latipov , S. Avramenko. - PowerPoint PPT Presentation
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Fyodorov Eye Microsurgery Complex, Moscow, Russia
Calibrated Vacuum Ring for Calibrated Vacuum Ring for Intrastromal Corneal Ring Segment Intrastromal Corneal Ring Segment Implantation in Different Types of Implantation in Different Types of
KeratectasiaKeratectasia
K. TakchidiK. Takchidi, , B. MalyuginB. Malyugin, , S. IzmaylovaS. Izmaylova, , I. LatipovI. Latipov, , S. AvramenkoS. Avramenko
Intracorneal ring segmentScientific Experimental Production Plant, Fyodorov Eye Microsurgery Complex, Russia
Arc lengthArc length – 1 – 16600ºº Cross-sectionCross-section – – hemispherehemisphere Inner diameterInner diameter – – 5.0 mm5.0 mm Outer diameterOuter diameter – 5 – 5..66 mm mm Thickness rangeThickness range – – 0.150.15 – –
0.45 mm0.45 mm MaterialMaterial - - PMMAPMMA
Classical Ferrara method
Post-opPost-op
““Leakage effect”Leakage effect”
Our method of implantation
Implantation of 1 segmentImplantation of 1 segment 80% of corneal thickness80% of corneal thickness Incision doesn’t depend on meridian (steep, flat)Incision doesn’t depend on meridian (steep, flat) ICRS should cover the most ectatic areaICRS should cover the most ectatic area
Implantation of 1 segmentImplantation of 1 segment 80% of corneal thickness80% of corneal thickness Incision doesn’t depend on meridian (steep, flat)Incision doesn’t depend on meridian (steep, flat) ICRS should cover the most ectatic areaICRS should cover the most ectatic area
Total: 65 patients (68 eyes)1st group – II stage keratoconus (40 eyes)2nd group – III stage keratoconus (18 eyes)3rd group – pellucid marginal degeneration (4 eyes)4th group – post-Lasik keratectasia (6 eyes)
mm ff ageage
11stst group group 2828 1212 2727±±77
22ndnd group group 1111 77 2929±±88
33rdrd group group 33 11 2929±±22
44thth group group 33 44 2424±±33
Calibrated Vacuum Ring (CVR)
UCVA and BCVA dynamic in 4 groups:
0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0,8
0,9
1
pre-op 1 mon post-op
6 mon post-op
1 year post-op
II stage KCIII stage KCPMDpost-LASIK
0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0,8
0,9
1
pre-op 1 mon post-op
6 mon post-op
1 year post-op
II stage KCIII stage KCPMDpost-LASIK
Pre-op 1 mon post-op
2 mon post-op
OCT Visante
Pachymetry dynamic
400
410
420
430
440
450
460
470
480
до операции 1 мес п/о 3 мес п/о 6 мес п/о
II stage KCIII stage KCPMDpost-LASIK
pre-op post-op
Confocal microscopy
pre-oppre-op post-oppost-op
Our resultsOur results::Our resultsOur results::
Single ICRS implantation into the area of Single ICRS implantation into the area of maximal corneal ectasia showed satisfactory maximal corneal ectasia showed satisfactory orthopedic and functional resultorthopedic and functional result
Best functional results gained patients with II Best functional results gained patients with II stage keratoconus and post-Lasik keratectasiastage keratoconus and post-Lasik keratectasia
Single ICRS implantation into the area of Single ICRS implantation into the area of maximal corneal ectasia showed satisfactory maximal corneal ectasia showed satisfactory orthopedic and functional resultorthopedic and functional result
Best functional results gained patients with II Best functional results gained patients with II stage keratoconus and post-Lasik keratectasiastage keratoconus and post-Lasik keratectasia
Our resultsOur results::
The use of new device – CVR helps to fix The use of new device – CVR helps to fix the eye properly, precisely mark corneal the eye properly, precisely mark corneal zones, ease tunnel formation and segment zones, ease tunnel formation and segment insertion that lead to reduction of insertion that lead to reduction of surgery durationsurgery duration
Final conclusion should be based on Final conclusion should be based on further observationfurther observation