- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT03204084
Assessment of Low-temperature Plasma Surgery System in Pterygium With Fibrin Glue and Conjunctival Autografts
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
About Plasma It's confirmed that there are 3 physical forms of material existence in human living environment. They are solids, liquids and gass. And any physical form can exist in different states due to the influence of environmental factors. Plasma is the fourth form of material existence. It's composed of ionized conductive gases, including six typical particles, which are electron, positive ion, negative ion, atom or molecule at excited state, atom or molecule at ground state, and photon. Plasma is composed of those positive and negative charged particles and neutral particles, and is a kind of quasi-neutrality gas with collective behavior. It's called plasma when the total negative electric charge equals to the total positive electric charge. 99% visible materials in universe may exist in plasma state, including fixed stars. Plasma can be natural or man-made. For example, the lighting during rainstorms is plasma phenomena, because the high voltage difference between cloud layer and ground makes the air ionized. And neon light and fluorescent lamp are from man-made plasma. The gases in light tube are ionized into plasma state.
About Plasma Low temperature plasma (LTP) Surgery System Low temperature plasma (LTP) Surgery System(made in Chengdu Mechan Electronic Technology Co.,Ltd), which avoids causing burn injuries to patients, has been introducing into minimally invasive surgery. The mechanism by which this equipment stops bleeding is to directly occupy the injury with the formed blood clots, and different from the mechanism of the common electrical hemostatic devices that cauterize the tissues around the bleeding to stem the blood flow. At the same the Plasma Low temperature plasma (LTP) Surgery System has a some biological effects, such as ablation of the organization, this ablation function is generally not penetrating, and only has effect on the contact surface,which can safely handle with the tissue wound and prevent the planting and recurrence.
Study Type
Enrollment (Actual)
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Sampling Method
Study Population
Description
Inclusion Criteria:
- all cases are primary pterygium,a follow-up period of more than 3 months after surgery
Exclusion Criteria:
- no immunorelated disease, ocular surface disease, glaucoma, or eyelid disease. Patients with recurrent pterygium were excluded from the study.
Study Plan
How is the study designed?
Design Details
Cohorts and Interventions
Group / Cohort |
Intervention / Treatment |
---|---|
the LTP group
Patients undergoing pterygium surgery with fibrin glue and conjunctival autografting and receiving Low-temperature Plasma Surgery System(LTP group),
|
In pterygium surgery with fibrin glue(FG) and conjunctival autograft we use Low-temperature Plasma Surgery System(LTP)do the ablation of tissue and hemostasis.
|
the control group
Patients undergoing pterygium surgery with fibrin glue and conjunctival autografting and receiving the conventional method using surgical micro knife and ophthalmic hemostasis(control group)
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
The changes of Best-corrected visual acuity (BCVA),
Time Frame: Before surgery,1-day, 1-week, 1-month, 3-month
|
Non-contact ocular pressure measuring instrument
|
Before surgery,1-day, 1-week, 1-month, 3-month
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
The changes of Patient's subjective discomfort evaluated in terms of the ocular symptom scores(OSS)
Time Frame: Before surgery,1-day, 1-week, 1-month, 3-month
|
OSS including five kinds of subjective sensory scale of foreign body sensation, burning sensation, visual fatigue, dryness and eye pain.
|
Before surgery,1-day, 1-week, 1-month, 3-month
|
conjunctival autograft inflammation
Time Frame: 1-day, 1-week
|
Inflammation Grade 0: No dilated corkscrew vessel in the graft Grade 1: 1 bright red, dilated corkscrew vessel crossing the graft-bed margin Grade 2: 2 bright red, dilated corkscrew vessels crossing the graft-bed margin Grade 3: three bright red, dilated corkscrew vessels crossing the graft-bed margin
|
1-day, 1-week
|
The changes of the ocular surface inflammation assessed by the Oculus Keratograph○R5M (Oculus Optikgerate GmbH, Wetzlar, Germany), with temporal conjunctival hyperaemia index(TCHI)
Time Frame: Before surgery, 1-week, 1-month, 3-month
|
the ocular surface inflammation assessed by the Oculus Keratograph○R5M (Oculus Optikgerate GmbH, Wetzlar, Germany)
|
Before surgery, 1-week, 1-month, 3-month
|
The postoperative complications were examined, including dehiscence, dislocation, sclera wound healing defects, granuloma and high intraocular pressure
Time Frame: 1-week, 1-month, 3-month
|
Digital slit-lamp photography was performed during each postoperative visit
|
1-week, 1-month, 3-month
|
The recurrence
Time Frame: 3-month
|
Digital slit-lamp photography was performed at 3-month
|
3-month
|
slit-lamp examination
Time Frame: Before surgery,1-week, 1-month
|
Corneal epithelium healing
|
Before surgery,1-week, 1-month
|
determination of intraocular pressure
Time Frame: Before surgery, 3-month
|
Non-contact tonometer
|
Before surgery, 3-month
|
The changes of Patient's subjective discomfort evaluated in terms of the visual analogue scale(VAS) by a questionnaire method
Time Frame: Before surgery,1-day, 1-week, 1-month, 3-month
|
Visual Simulation Scoring (VAS): The method is more sensitive and comparable.
The specific approach is: on the paper to draw a 10 cm horizontal line, one end of the horizontal line is 0, that painless; the other end is 10, that pain; the middle part of the different degrees of pain.
Let the patient according to self-feeling in the horizontal line on a mark, that the degree of pain
|
Before surgery,1-day, 1-week, 1-month, 3-month
|
The subconjunctival haemorrhage (SCH)
Time Frame: 1-day, 1-week
|
Subconjunctival haemorrhage
|
1-day, 1-week
|
graft stability according to scoring scale
Time Frame: 1-day, 1-week
|
Grade 0: None Grade 1: 25% of the size of the graft Grade 2: 50% of the size of the graft Grade 3: 75% of the size of the graft Grade 4: Haemorrhage involving the entire graft (no subconjunctival vessels visible Grade 4: >3 bright red, dilated corkscrew vessels crossing the graft-bed margin Graft stability Grade 0: All four sides of the graft margin are well apposed Grade 1: Gaping/displacement of one side of the graft-bed junction Grade 2: Gaping/displacement of two sides of the graft-bed junction Grade 3: Gaping/displacement of three sides of the graft-bed junction Grade 4: Graft completely displaced from the bed |
1-day, 1-week
|
Collaborators and Investigators
Study record dates
Study Major Dates
Study Start (ACTUAL)
Primary Completion (ACTUAL)
Study Completion (ACTUAL)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (ACTUAL)
Study Record Updates
Last Update Posted (ACTUAL)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- 2016011
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
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.
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