|
A CTR is a 270 degree open PMMA ring placed in the capsular bag during cataract surgery in cases with zonular instability or weakness
Aurolab manufactures 3 types of CTR, |
 |
| Product Features: |
| All types made from Clinical Quality UV absorbing PMMA, they are |
 |
Capsular tension rings (standard type) |
| |
|
For cases involving less than 4 clock hours (4 positions) of zonular dialysis, a standard CTR is suitable |
|
|
Cionni rings with single and double loop |
| |
|
For cases involving greater than 4 clock hours or progressive zonular damage |
|
|
Capsular tension segment |
| |
|
Partial ring used in cases that cannot be supported by CTR |
|
|
|
|
| Indications: |
|
Stabilization of the crystalline lens capsule in the presence of weak or absent zonules. |
|
Pseudoexfoliation (lead to lens capsular damage, most common in glaucoma) |
|
Prior trauma which leads to Zonulysis( damage of zonules) or capsular rupture |
|
Expected complications during phaco surgery. |
|
Situations in which sudden unfolding of a foldable IOL might cause zonular breakage or dislocation of the IOL. |
|
Repositioning of IOL decentration. |
|
Marfan syndrome (results in subluxated lens with weak zonules) |
|
|
| Capsular Tension Ring (CTR) |
 |
|
CTR is an open-ended, |
| |
|
flexible horseshoe-shaped polymethyl methacrylate (PMMA) filament |
|
with two eyelets at either end |
|
|
|
|
| Benefits: |
|
It is used in cases involving less than 4 clock hours of zonular dialysis. |
|
Ensures stable conditions during surgery |
|
Prevents capsular fibrosis |
|
| Models: |
|
| |
| Overall Diameter |
10.00 mm |
11.00 mm |
| Closed Diameter |
12.00 mm |
13.00 mm |
|
|
|
| |
|
|
| Cionni Rings |
 |
|
In cases of profound zonulysis (i.e., greater than 4 clock hours) or extensive progressive zonular dialysis, a standard CTR may not provide adequate centration and stability |
|
In these case, a modified CTR designed by Cionni adds a comma-shaped filament attached to the main ring with an additional eyelet that allows it to be sutured to the scleral wall without piercing the capsular bag |
|
The eyelet is offset anteriorly to allow it to sit outside the capsular bag |
|
A double eyelet configuration is available for cases requiring additional support |
|
|
| Cionni models: |
 |
|
Cionni with single right eyelet (CCR) |
|
Cionni with single left eyelet (CCL) |
|
Cionni with double right & left eyelet (CCLR) |
|
|
 |
| Model No |
CC10L, CC10R, CC10LR |
CC11L, CC11R, CC11LR |
|
 |
|
| |
| Overall Diameter |
12.00 mm |
13.00 mm |
| Closed Diameter |
10.00 mm |
11.00 mm |
|
|
|
| |
|
| Capsular Tension Segment |
 |
|
This is a zonular support device that provides support for in-the bag implantation. |
|
Its versatility enable early or late placement within the capsular bag. |
|
It can be used in cases that cannot be supported by CTRs. |
|
It is a partial ring with a fixation hook |
|
|
| Implantation |
|
CTR/ Cionni can be implanted manually or with the help of specially designed injector |
|
Requires presence of intact capsulorhexis and capsular bag. |
|
Can be implanted at any step after capsulorhexis, but early placement makes cortical removal more difficult and tedious. |
|
For these reasons, it is helpful to maintain multiple iris retractors at the capsulorhexis edge to stabilize the capsular bag during phacoemulsification and cortical removal |
|
After lens extraction, the iris retractors can be removed once the CTR has been safely implanted into the capsular bag prior to IOL insertion. |
|
| Advantages: |
|
Circular expansion of capsular bags |
|
Stablizes conditions during surgery |
|
Improves IOL centration |
|
Reduces risk of capsular fibrosis |
|
Resists capsular shrinkage |
|
|
| Top |
