Multi-center Clinical Observation of FCVB in Guangdong Province

Study Overview
=================
Brief Summary
-----------------
This study provides further theoretical guidance for clinical application of FCVB through observing and collecting various indicators before and after surgical treatment of the FCVB in the real world.

Detailed Description
-----------------
Research purpose: Collect and analyze the medical data in clinical work, in order to provide further theoretical guidance for the clinical application of FCVB. Inclusion criteria: 1) Patients with severe retinal detachment, cannot be cured with existing vitreous substitutes, and are scheduled for FCVB implantation surgery; 2) Patients with silicone oil dependent eye, silicone oil emulsification, and chooses FCVB surgery; 3) Patients whose eyeball Atrophy, and strongly demand eye protection. Exclusion criteria: 1) Patients with positive urine pregnancy test; 2) Patients with FCVB removed and switched to other alternative treatments; 3) Patients the investigator consider are not suitable for this clinical trial. Endpoint Primary endpoint: Changes in corneal transverse diameter and ocular protrusion after 1 year of FCVB implantation. Secondary endpoints: visual acuity and intraocular pressure; local inflammatory response and complications evaluation; satisfaction investigated by questionnaire survey. Process Before surgery, collecting the patient's medical history and pre-operative related specialist examination data and subjective opinions of doctors on surgical indications. Recording the surgical procedure, intraoperative complications. After surgery (3 days, 1 week, 2 weeks, 4 weeks, 3 months, 6 months after surgery, 1 year and 1 year follow-up every year), using visual acuity chart, slit lamp microscope, ophthalmoscope, intraocular pressure, Hertel exophthalmometer, vernier caliper to observe the patient's visual acuity, local inflammatory reaction, intraocular pressure and eyeball atrophy changes. Efficacy evaluation Main indicators: the changes of corneal transverse diameter and ocular protrusion were observed 1 year after FCVB implantation. Secondary indicators: visual acuity and intraocular pressure; local inflammatory response and complications evaluation; satisfaction investigated through questionnaire survey. Safety evaluation Adverse events that occurred during all studies. Termination criteria During the clinical trial, the clinical trial shall be terminated in any of the following cases; (1) FCVB cannot be implanted (2) Subjects who fail to comply with the program requirements (including loss of follow-up) are subject to termination by the study physician; (3) a female patient who is intentionally pregnant or a female subject who has been confirmed to have been pregnant; (4) Participated in other clinical trials after participating in this clinical trial; (5) Adverse events or serious adverse events occurred during the trial and were unable to continue participating in the study; (6) The subject withdraws the informed consent or requests termination of the trial for some objective reason.

Official Title
-----------------
Multi-center Clinical Observation of FCVB in Guangdong Province

Conditions
-----------------
Retina Detachment, Eye Injuries, Eye Atrophy, Silicone Emulsion

Intervention / Treatment
-----------------
* Device: Foldable Capsular Vitreous Body (FCVB)


Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria: Patients with the diagnose that severe retinal detachment and cannot be cured with existing vitreous substitutes, or silicone oil dependent eye accompanied with silicone oil emulsification, or eyeball atrophy meanwhile patients strongly demand keeping eyeball. Patients agree to receive FCVB implantation surgery. Exclusion Criteria: Patients whose urine pregnancy test are positive. Patients whose FCVB have been removed and switched to other alternative treatments. Patients whom the investigator consider are not suitable for this clinical trial.

Ages Eligible for Study
-----------------
Minimum Age: 18 Years

Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
No

Study Plan
=================
How is the study designed?
-----------------

Arms and Interventions

| Intervention/Treatment |
| --- |
|Device: Foldable Capsular Vitreous Body (FCVB)|FCVB can be regarded as an artificial vitreous and consists of a thin vitreous-shaped capsule, a drain tube, and a valve. After foldable implantation into the eye, then silicone oil is injected into the capsule which inflated to support the retina. The capsular material of FCVB is silicone rubber. The capsule was fabricated a computer simulation of the human and rabbit vitreous cavities. The control of the intraocular pressure is achieved with adjusting the amount of injected medium through the tube-valve system. After the medium was injected into the capsule through the tube-valve system, the valve was subsequently fixed onto the sclera surface similar to the glaucoma valve.|

What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Corneal transverse diameter change | Determine the degree of eyeball atrophy through the change of transverse Diameter of the cornea | Corneal transverse diameter change from 1day before surgery to 1 year after surgery | 
| Ocular protrusion change | Determine the degree of eyeball atrophy through the ocular protrusion change | Ocular protrusion change from 1day before surgery to 1 year after surgery | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Visual acuity | Postoperative visual acuity | 3 days, 1 week, 2 weeks, 4 weeks, 3 months, 6 months after surgery, 1 year after surgery | 
| Intraocular pressure | Postoperative intraocular pressure | 3 days, 1 week, 2 weeks, 4 weeks, 3 months, 6 months after surgery, 1 year after surgery | 
| Local inflammatory response | Evaluation of postoperative complications | 3 days, 1 week, 2 weeks, 4 weeks, 3 months, 6 months after surgery, 1 year after surgery | 
| Patients satisfaction | Postoperative patients satisfaction | 3 days, 1 week, 2 weeks, 4 weeks, 3 months, 6 months after surgery, 1 year after surgery | 

 Terms related to the study
=================
Keywords Provided by Centre Hospitalier Valida
-----------------
eye atrophy, Foldable Capsular Vitreous Body, Retina detachment