- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT02173847
Laser Assisted Procedures in Penetrating Keratoplasty
Laser Assisted Procedures in Penetrating Keratoplasty: Femtosecond Laser Anvil-shaped Cuts and Laser Welding of the Surgical Wounds
Laser- assisted procedures in penetrating keratoplasty (PK) are proposed to improve the surgical outcomes: minimally invasive procedures, improved biomechanical stability of the transplanted flap, reduction of rejection risks, reduction of inflammation, reduction of infections risk, faster healing process.
In order to achieve these goals, two different lasers were used during PK surgery:
- a femtosecond laser to cut an anvil shaped profile
- a diode laser to weld the surgical wound
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
The femtosecond laser is used to cut an anvil-shaped laser incision used in PK. This design has the purpose to create a more structurally stable and predictable wound configuration with the aim of a faster recovery of vision and higher optical quality, compared with the conventional blade trephination and the most common laser-cut patterns. The "anvil" profile is designed as described in the followings. Donor and recipient corneal trephination are performed using a 150 kHz FS laser (iFS150TM, IntralaseTM FS Laser, Abbott Medical Optics -AMO, Santa Ana, CA, USA). As concerned iFS150 settings, we refer to the following technical parameters: in the donor graft, the outer and inner diameters of the ring lamellar cut at 350 µm in depth were set at 8.5 mm and 6.6 mm, respectively; the anterior-side cut started with an angle of 135° at a diameter of 7.7 mm, while the straight posterior side cut diameter was 6.7 mm. In the recipient eye, the diameters were designed to be 0.2 mm shorter (8.3 mm outer diameter, 6.4 mm inner diameter, 7.5 mm anterior side cut and 6.5 mm posterior side cut). After completion of the trephination, the corneal button was gently lifted from the host and the donor graft was secured in place on the recipient bed by means of 10-0 nylon cardinal sutures, which were removed after the final 16-running 10-0 nylon suture was completed. A similar FS-laser cut procedure producing a 0.2 mm-narrower corneal bed -diameter is performed on the patient's recipient eye. After completion of the trephination, the corneal button is lifted gently from the host and the donor graft is secured into place with 10-0 nylon cardinal sutures, that are removed as a running 10-0 nylon suture is placed.
The particular "anvil" shape of the graft provides a larger contact surface in between donor and recipient cornea, which enables an effective application of the diode laser welding technique of corneal wounds we have previously set up in cataract and PK applications (Menabuoni et al. 2007, Rossi et al. 2008). This laser-assisted suturing technique is based on the photothermal activation of the stromal collagen, providing an immediate sealing of the surgical wound and a good stabilization of the graft. Once the donor graft was sutured in its final position, diode laser welding was performed. A sterile saturated water solution of 10% w/v Indocyanine Green (ICG) (Pulsion Medical System AG, Munich, Germany) was prepared and applied to the walls of the surgical wound at the donor-recipient interface. A mild photothermal effect was induced by means of a near infrared diode laser (Mod. WELD 800, El.En., Calenzano, FI, Italy) that emitted at 810 nm. The laser light was delivered through a 300-micron core diameter optical fiber that was mounted on a handpiece and used "as a pencil" by the surgeon under a surgical microscope. In a slow, continuous/fluid motion, the surgeon moved the fiber tip along the wound edge at a distance of 1.5 mm from the external surface of the cornea. The power radiation emitted was a 60 mW continuous wave, which resulted in an 8 W/cm2 power density on the tissue surface. The laser welding treatment time was set at 130s.
Thanks two the combine laser assisted procedures, the possible reduction of suture materials allows a faster and improved the healing process, with minimal inflammation and reaction. Thus the combination of FS laser trephination with the diode laser welding technique may provide extremely precise, and minimally invasive surgical procedures in PK.
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
-
-
-
Prato, Italy, 59100
- U.O. Oculistica Nuovo Ospedale S. Stefano
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Corneal dystrophy
- keratoconus in its final stages
- post-herpetic leukoma
- corneal scar
Exclusion Criteria:
- systemic diseases
- previous corneal surgery
- glaucoma
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: N/A
- Interventional Model: Single Group Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Penetrating keratoplasty
Femtosecond laser sculptured anvil graft.
Diode laser welding of the flap in its final position.
12 months follow up study
|
Femtosecond laser sculptured anvil graft.
Laser welding of the flap in its final position.
12 months follow up study
A commercial femtosecond laser to cut a particular shaped graft
Low power, near infrared diode laser for welding the surgical wound
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Change in best spectacle-corrected distance visual acuity (CDVA)
Time Frame: 1 day, 7 days, 1 month, 3 months, 6 months, and 12 months after surgery
|
documentation of the visual acuity of patients
|
1 day, 7 days, 1 month, 3 months, 6 months, and 12 months after surgery
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Change in objective astigmatism and specular corneal topography
Time Frame: 1 day, 7 days, 1 month, 3 months, 6 months, and 12 months after surgery
|
Objective astigmatism and specular corneal topography were evaluated by using a topographer-pachymeter
|
1 day, 7 days, 1 month, 3 months, 6 months, and 12 months after surgery
|
Other Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Change in anterior segment optical coherence tomography
Time Frame: 1 day, 7 days, 1 month, 3 months, 6 months, and 12 months after surgery
|
All patients underwent anterior segment optical coherence tomography to evaluate wound alignment and suture configurations
|
1 day, 7 days, 1 month, 3 months, 6 months, and 12 months after surgery
|
Collaborators and Investigators
Sponsor
Collaborators
Investigators
- Principal Investigator: Luca Menabuoni, MD, Head of Corneal and Experimental Surgery at the Department of Ophthalmology
Publications and helpful links
General Publications
- Buzzonetti L, Capozzi P, Petrocelli G, Valente P, Petroni S, Menabuoni L, Rossi F, Pini R. Laser welding in penetrating keratoplasty and cataract surgery in pediatric patients: early results. J Cataract Refract Surg. 2013 Dec;39(12):1829-34. doi: 10.1016/j.jcrs.2013.05.046. Epub 2013 Oct 18.
- Rossi F, Matteini P, Ratto F, Menabuoni L, Lenzetti I, Pini R. Laser tissue welding in ophthalmic surgery. J Biophotonics. 2008 Sep;1(4):331-42. doi: 10.1002/jbio.200810028.
- Menabuoni L, Pini R, Rossi F, Lenzetti I, Yoo SH, Parel JM. Laser-assisted corneal welding in cataract surgery: retrospective study. J Cataract Refract Surg. 2007 Sep;33(9):1608-12. doi: 10.1016/j.jcrs.2007.04.013.
- Rossi F, Pini R, Menabuoni L. Experimental and model analysis on the temperature dynamics during diode laser welding of the cornea. J Biomed Opt. 2007 Jan-Feb;12(1):014031. doi: 10.1117/1.2437156.
- Rossi F, Pini R, Menabuoni L, Mencucci R, Menchini U, Ambrosini S, Vannelli G. Experimental study on the healing process following laser welding of the cornea. J Biomed Opt. 2005 Mar-Apr;10(2):024004. doi: 10.1117/1.1900703.
- Menabuoni L, Canovetti A, Rossi F, Malandrini A, Lenzetti I, Pini R. The 'anvil' profile in femtosecond laser-assisted penetrating keratoplasty. Acta Ophthalmol. 2013 Sep;91(6):e494-5. doi: 10.1111/aos.12144. Epub 2013 Apr 26. No abstract available.
- Matteini P, Rossi F, Menabuoni L, Pini R. Microscopic characterization of collagen modifications induced by low-temperature diode-laser welding of corneal tissue. Lasers Surg Med. 2007 Aug;39(7):597-604. doi: 10.1002/lsm.20532.
Study record dates
Study Major Dates
Study Start
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Estimate)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- MIL-PO-001
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
Clinical Trials on Corneal Opacity
-
University of California, IrvineWithdrawnCORNEAL OPACITY WITH POOR PROGNOSIS FOR CORNEAL TRANSPLANTUnited States
-
Omar SaidCompletedCorneal OpacityEgypt
-
Oregon Health and Science UniversityNational Eye Institute (NEI); National Institutes of Health (NIH)Completed
-
United States Naval Medical Center, San DiegoActive, not recruitingCorneal OpacityUnited States
-
Oregon Health and Science UniversityNational Eye Institute (NEI); National Institutes of Health (NIH)Terminated
-
Federal University of São PauloUnknownKeratitis | Corneal OpacityBrazil
-
Oregon Health and Science UniversityNational Eye Institute (NEI); National Institutes of Health (NIH)Terminated
-
Baskent UniversityCompleted
-
University of UtahCompletedCorneal Opacity | Intraocular PressureUnited States
-
University Hospital, Strasbourg, FranceTerminatedKeratitis | Pterygium | Corneal Perforation | Corneal Opacity Corneal ThinningFrance
Clinical Trials on Penetrating keratoplasty
-
Hospital Oftalmologico de SorocabaUnknown
-
The S.N. Fyodorov Eye Microsurgery State InstitutionCompleted
-
University Hospital FreiburgGerman Research FoundationCompleted
-
Oregon Health and Science UniversityNational Eye Institute (NEI); National Institutes of Health (NIH)Terminated
-
Zhongshan Ophthalmic Center, Sun Yat-sen UniversityRecruitingCorneal TransplantationChina
-
Centre hospitalier de l'Université de Montréal...Maisonneuve-Rosemont HospitalWithdrawnHigh-risk Corneal Transplantation | Corneal Blindess | Corneal Inflammation | Deep Anterior Lamellar Keratoplasty
-
Instituto de Oftalmología Fundación Conde de ValencianaCompletedKeratoconus
-
Ausio Pharmaceuticals, LLCCompletedBenign Prostatic HyperplasiaUnited States, India
-
Cornea Research Foundation of AmericaCompletedBullous Keratopathy | Fuchs' Endothelial Corneal Dystrophy | Iridocorneal Endothelial Syndrome | Posterior Polymorphous DystrophyUnited States
-
Aarhus University HospitalCompletedFuchs' Endothelial Corneal DystrophyDenmark