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Catheter Technique

Treatment Description

The MOCA procedure (Mechanical Occlusion with Chemical Assistance), otherwise known as ClariVein® in the United States, uses a blunt-ended, rotating fiber that gently, but rapidly spins in the inside of veins, agitating the lining, while a chemical used to normally treat veins is then injected to assist in the closure of the abnormal vein.


Because ClariVein® works strictly inside the vein, there is no risk of nerve injury. Only local anesthesia is necessary. Patients experience a vibration sensation. It is performed through a tiny entry point -- no stitches or staples. The procedure is quick, performed while you are awake, in the office avoiding hospitalization, and you will be able to immediately walk and return to most activities with few limitations.

Procedure Description

The VNUS Closure Fast procedure is an outpatient procedure done either in a hospital or in a radiology clinic. The entire procedure is visualized under ultrasound.

There are no extensive preparations required prior to the procedure but one must:

Not to take aspirin about a week prior to the procedure.

Discuss with the physician when to stop any blood thinning or other medications.

Wait at least 1-2 weeks if there is evidence of any type of skin infection.


On the day of the procedure, you will be asked to lie down on a bed and the leg will be cleaned. The varicose vein in the thigh area will be identified from the knee to the groin. A small amount of a local anesthetic will be injected into the skin and a small needle will be placed in the varicose vein. Through this needle the VNUS Closure Fast electrode will be inserted and directed up to the groin.

When the catheter is in position, radiofrequency energy is applied to the vein and the catheter is gently withdrawn. The radiofrequency energy heats up the vein and causes it to collapse. This leads to eventual closure of the vein.

Following the procedure, a bandage is placed over the insertion site, and additional compression is provided to keep the area clean. One is encouraged to walk and resume all normal activities.
The Closure Fast technique only takes a few minutes. Current data indicate that individuals who have been treated with the VNUS closure Fast procedure have:

• Faster recovery.
• Minimal pain.
• Minimal bruising.
• Less pain.

The majority of individuals resume their normal activities in a day. After a week, the majority of individuals show improvement in their leg symptoms, the final cosmetic appearance takes a few months to appear.

The VNUS closure procedure