Packaged in a pre-loaded configuration, the iStent is inserted through a small corneal incision made during cataract surgery and placed into Schlemm's canal, a circular channel
in the eye that collects aqueous humor and eventually delivers it into the bloodstream.
The highest velocities are achieved in the center of the channels, especially in the circular channel, where the velocity profile shows a maximum velocity of 4.
The highest shear stress corresponds to the one on the 'triangular' channel, while the smallest, corresponds to the circular channel.
In addition to the benefits of height gains and dismantling ease, the innovative design allows dust extraction to be provided by a continuous circular channel
on the spiral's outside circumference with a compressed air in-feed from the center channel.
This circular channel
was attached to a control gate and a discharge tank through another direct channel which was 5.
The working volume of the loading unit was simplified assuming it as a parallelepiped with a cross-section corresponding the size of moving plate in hydraulic loading unit (55x60 mm), and consisting of two 100 mm length chambers, separated by the diaphragm having a changeable diameter circular channel
(from 3 to 12 mm).
Figure 8 shows a cross-section cut of polystyrene taken near the end of the circular channel
To avoid discretization of the circular channel
along the circumference, which would require a lot of small triangular shell elements, and thus save a substantial amount of computer memory, the so-called line source (sink) approach first developed by Barone and Caulk  and further extended by Rezayat and Burton  for cooling channel simplification in three-dimensional parts was implemented.
Five different die channel geometries were used in this study; a square channel, a rectangular channel, a teardrop shaped channel, a circular channel
, and a rectangular manifold channel.
Approximately 930 m circular channel
, about 190 pcs.
Extrudate swell from the square channel approaches its limit much more rapidly with increasing surface tension than does that from the circular channel
This range includes: trenchless renovation of circular channels
with a diameter of dn 300 - 600 mm and channels eggshaped with dimensions 200/300 - 400/600 mm with a total approximate length l = 1641.