Texto com notícias do cornealring
  1. Which are the differences between Corneal Ring and the older ones (Ferrara ring/Keraring)?
  2. Which are the Corneal Ring advantages as compared to the older models?
  3. Has the Corneal Ring higher flattening power than the older rings?
  4. I am afraid of using new technologies. Does the Corneal Ring really work?
  5. What assures me that this new ring is good or even better than the older ones?
  6. I have the older instrumentarium to implant the Ferrara ring/Keraring devices. Am I supposed to change it for Corneal Ring implantation purposes?
  7. How does the surgical procedure change for the Corneal Ring implantation?
  8. Which are the advantages of the new Tunnel maker?
  9. May I insert the Corneal Ring using the Phentosecond Laser (Intralaser and others)?
  10. Why the Corneal Ring standard segment arch length measures 155 degrees? (different from the former triangular-shaped segments measuring 160 degrees)
  11. I have only one (01) segment of the former model (Keraring or Ferrara ring) stored and plan to insert two segments in my patient's eye. May I insert in the same eye one segment of the former model pairing with one Corneal Ring segment?
  12. How can I attend to a learning or improvement Course on the Corneal Ring implantation surgery?
  1. Which are the differences between Corneal Ring and the older ones (Ferrara ring/Keraring)?

    Corneal Ring is more round-shaped (with a fusiform cross-section) as compared to the triangular-shaped cross-section former rings. It also has a larger cross-section area, this increasing its effectiveness. The Corneal ring has a 4.7mm inner edge, compared to the Ferrara ring or Keraring 4.4mm inner edge. Back to top

  2. Which are the Corneal Ring advantages as compared to the older models??

    Less tissue distress over the ring. The Ferrara Ring and Keraring models have a triangular-shaped cross-section that concentrates all pressure from the segment on the ring sharp apex. Therefore, the cells of this region are negatively impacted by this concentrated pressure and experience difficulty to keep their physiological metabolism. This suffering area may extend up to the epithelium, which turns thinned and may disappear (deepithelization on the ring). These changes are easier noted in the presence of:
    1) a very thick segment;
    2) a superficially implanted segment.
    Fewer Glares. Corneal Ring has a 4.7mm inner diameter, compared to the 4.4mm for the Ferrara ring and Keraring devices. Back to top

  3. Has the Corneal Ring higher flattening power than the older rings?

    No. Corneal Ring was designed to provide the same flattening effect as that of the Ferrara ring/Keraring similar thickness models. Corneal Ring has a larger cross-section area than the former models, which increases its flattening power (the bigger the stromal lamellae deviation gained by a bigger mass volume implant, the bigger the corneal flattening will be). On the other side, the Corneal Ring has a larger diameter (4.7mm inner diameter, compared to the 4.4mm of the former models), which reduces its effect, under the Blavatskaia law. In conclusion, the increased effect gained by virtue of its mass volume increase is balanced by its larger diameter, thus keeping the flattening intensity, as compared to the traditional triangular-shaped model. Back to top

  4. I am afraid of using new technologies. Does the Corneal Ring really work?

    It is important to highlight that Corneal Ring does not represent the launching of a new concept in terms of keratoconus management. It represents the evolution of already tested products, which proved to be effective (Intacs, Ferrara Ring, Keraring). All human inventions deserve to be studied for improvement purposes. The New Corneal Ring device resulted from watching the existing available models and that represent the consensus among the ophthalmologists, to read:
    1) The complaint about the glare, or "Doctor, I can see the ring" is very common after a surgical procedure with the Ferrara Ring/Keraring devices. Does anybody disagree that it would be desirable to increase the older rings' 4.4 mm inner diameter? Well, the only action taken was to create a technology to produce a ring with a larger diameter without loosing its flattening effect.
    2) Deepithelization on the ring insertion site, either punctiform with a foreign body sensation, or extensive, is relatively common after surgeries with Intacs/Ferrara ring/Keraring devices. Does anybody disagree that to attenuate the "sharp edge" of the older segments by replacing the upper sharp end for a smoother and rounded one, thus reducing the tissue distress, would be desirable? Well, we changed the traditional models format and smoothed their profile! In conclusion, it is only a matter of improving the available technologies. Back to top

  5. What assures me that this new ring is good or even better than the older ones?

    As explained, the changes introduced to the older models, and which resulted in the Corneal Ring development, were nothing more than the necessary corrections to the project, visualized by worldwide ophthalmologists for the last 15 years. It is not a new management concept for the treatment of keratoconus, but else the improvement of the arsenal we already had. Visiontech is not a beginning company in this field. The company is regularly producing a traditional triangular-shaped cross-section ring for years, with exports to more than 30 countries. To illustrate the company potential, one should mention that more than 10,000 units of intrastromal segments were produced only in 2006! And building on that experience, Visiontech noted that the moment has come when it was essential to improve its product, as it has been gathering all the remarks, complaints and suggestions from ophthalmologists about the intrastromal ring. The company knew about the needs and technology to do it. There was no reason to remain in "sameness" if it had the possibility to do better. By analogy: When General Motors launches a new automobile model, does anybody question about its functioning? The answer is "No", as customers know that GM is not a beginner in the field and that, for sure, the new model uses all knowledge gained from older models produced in the past, added of all customer-based corrections. It would be unacceptable to launch a product encompassing defects already known from older models. Under the same reasoning, Corneal Ring was born with the Visiontech quality, reliability and worldwide experience stamps. Back to top

  6. I have the older instrumentarium to implant the Ferrara ring/Keraring devices. Am I supposed to change it for Cornealring implantation purposes?

    No. The only thing to do is a minor adjustment to your surgical procedure. The tunnel zone marker for the Ferrara Ring/Keraring prints an inner 4.4 mm and an outer 5.6 mm circumference at the cornea. Under the traditional procedure for these rings, the spatula has to insert precisely between these two circumferences to make the tunnel (see Figure below). For the Corneal Ring, the surgeon has to have in mind that this device has a slightly larger diameter, as compared to the old ones (Corneal Ring has a 4.7 mm inner diameter, compared to the 4.4 mm of the former triangular-shaped segments). Therefore, the spatula has to insert below the outer circumference marked on the cornea, moving away from the inner circumference (see Figure below). For better control of the spatula direction, it is recommended to hold the eye tight with a Kremer's forceps fixed at the periphery of the annulus conjunctivae. The specific instrumentarium for the Corneal Ring implantation is already available, thus avoiding adaptations to the surgical procedures. This instrumentarium was designed not only to increase the spatula diameter, but also to incorporate a number of improvements to the former models (please see: "What has changed in the tunnel maker?) Please call Visiontech for details on how to purchase this equipment. You may be free of charge when purchasing an established amount of these rings (Visiontech contacts are presented at: www.visiontech.com.br ). Back to top

  7. How does the surgical procedure change for the Cornealring implantation?

    The surgical procedure is the same one used for the Ferrara Ring or Keraring implants. Only those professionals lacking the Tunnel Maker and the Double Marker instruments specific for the Corneal Ring implantation are advised of the need to make a slightly larger diameter tunnel, as explained on item 6. Back to top

  8. Which are the advantages of the new Tunnel maker?

    Click here to know the advantages of the new tunnel maker.Back to top

  9. May I insert the Corneal Ring using the Phentosecond Laser (Intralaser and others)?

    Yes. To adjust the equipment, it is necessary to know the Corneal Ring both inner and outer diameters, to allow the making of the correct dimensioned tunnel. These measures are 4.7 mm and 5.9 mm, respectively. For the surgeon who plans a larger tunnel to ease implantation, it is recommended not to change the tunnel inner limit, which is 4.7 mm, but SLIGHTLY increase the outer limit to 6.0 mm. Summary: Intralase adjusts: inner diameter=4.7mm and outer diameter=6.0mm. Back to top

  10. Why the Corneal Ring standard segment arch length measures 155 degrees? (different from the former triangular-shaped segments measuring 160 degrees)

    The arch length reduction from 160 to 155 degrees for each segment is part of the improvement package of this new generation of intrastromal implants. This minor change does not significantly interfere with the ring efficiency, however, it represents a SUBSTANTIAL REDUCTION in the rate of extrusion complications, as the segment end is placed far from the incision site. For better clarification, in addition to the 155 degrees arch length Cornealring available today, Visiontech provides also both the 150 degrees Intacs segment and the 160 degrees Keraring/Ferrara ring segments. Back to top

  11. I have only one (01) segment of the former model (Keraring or Ferrara ring) stored and plan to insert two segments in my patient's eye. May I insert in the same eye one segment of the former model pairing with one Corneal Ring segment?

    The expected result in corneal curvature reduction will certainly be achieved. HOWEVER, WE DO NOT RECOMMEND a combination of different curvature segments, as the tension forces at the cornea may present an irregular distribution. And it is known that maximum uniformity of the corneal surface is key to its optical performance. Please call Visiontech to assess the possibility to substitute your old segment by a Corneal Ring segment. Back to top

  12. How can I attend to a learning or improvement Course on the Corneal Ring implantation surgery?

    Visiontech promotes several courses during the year, usually during congresses. The Course may also be attended on a private basis at your clinic/hospital, or you may visit the Visiontech plant. In this case, a course will be specially arranged for you. For more information, please call Visiontech at: +55 31 30843081 (Contact for international courses: Mr. Rodolfo Fajardo). Back to top

Logomarca da Visiontech Medical Optics   Av. Dep. Cristóvam Chiaradia, 518, Buritis, Belo Horizonte, MG - Brasil - 30575-815 - Telefax.: +55 (31) 3084-3081 - visiontech@visiontech.com.br