HFDS® was first presented by Prof. Bojan Pajic (Basel, Switzerland) in 1999. From a first study group (53 eyes) in 2002 there are now long-term results stretching over 72 months. From an average pre-operative value of 25.6 ± 2.3 mmHg the pressure reduced to 14.8 ± 1.7 mmHg.

These are results that, in contrast to methods like trabeculectomy or viscocanalostomy, are really very promising. In addition, HFDS® is attractive for the following reasons:

  • High success rate
  • Effective, lasting lowering of pressure
  • Very low complication rate
  • Particularly easy and fast intervention
  • No application of anti-metabolites or needling
  • Perfect in combination with cataract surgery
Surgery platforms
Glaucoma Procedure

How do I carry out an HFDS intervention?

Two paracenteses (1.2mm, clear corneal) are carried out in an arc of about 120°. The anterior chamber is filled with Healon GV. The abee® glaucoma tip is led in through the temporal paracentesis. The point of application (opposite irido-corneal angle, nasal) is observed with a 4-mirror prism. The abee® tip, starting from its internal tip, penetrates, by application of bipolar RF energy 1mm nasal through the trabecula network and the Schlemm's canal into the sclera, thereby forming a deep sclerotomy (pocket) of 0.15mm thickness and 0.3mm width. 6 such pockets are put in. The intervention lasts less than a few seconds per pocket and takes, e.g. in the case of a combined operation, hardly more than 3 minutes. HFDS® is therefore a minimally invasive method and highly suitable in combination with phaco. There is a learning curve, but in comparison with other methods it is very short.

Glaucoma Procedure
Glaucoma Procedure

How can the long-term effects be explained?

There is an outflow through the trabecular network into the Schlemm's canal and, in addition, via an uveoscleral and intra-scleral pathway without bleb formation. There is no fibroblast distribution, so there are no fibroblasts moving into the area of the pockets. The creation of the pockets with RF diathermia seems to prevent necrosis.

What equipment do I need?

The HFDS® function is optionally available with Oertli® surgery systems. Besides you need the abee® Glaucoma Tip (VE201751) and the diathermy handpiece (VE201712) to carry out the HFDS® procedure successfully.

Glaucoma Procedure
Glaucoma Procedure