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Hessburg-Barron
Vacuum Trephine |
The original
Hessburg-Barron Vacuum Trephine was developed in collaboration with
Dr. Philip Hessburg, president of
the Detroit Institute of
Ophthalmology. The instrument is
fabricated from the highest
grade stainless steel and FDA-approved polymer materials.
It is delivered in a sterile transparent
plastic tray with a
hermetically-sealed Tyvek lid,
which is sealed inside an outer
hermetic pouch so that an
attending personnel can open the
pouch and transfer the sealed
tray onto a sterile field
without touching the tray. The operating
physician or gloved assistant
can then open the tray,
and place the trephine onto the
sterile field for use.
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The Hessburg-Barron Vacuum Trephine was
developed to be
self-contained, with no
need for auxiliary
vacuum equipment. It uses a simple
hand-operated syringe to
create a vacuum to hold
the
cornea against the
trephine during
trephination. This
causes the cornea to be
held in its natural
contour, thereby
producing a perpendicular
incision in the cornea
to provide an optimal
recipient opening for
donor tissue. As shown in the schematic on the right,
an inner ring and outer
ring form a vacuum
chamber when the unit is
placed on the cornea.
The blade is located only 0.07 mm
inside of the inner
ring, which allows for
secure support of the
cornea during
trephination.
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As with all BPI trephine
products, the blade of the
Hessburg-Barron Trephine is
fabricated from the hardest
stainless steel that is
available, and its manufacture
employs a proprietary,
multiple-stage honing of the
blade edge to give
unsurpassed sharpness. Some other manufacturers of vacuum
trephines construct their
instruments with thin
(0.1 mm thick) bent razor
blades that are not perfectly
circular, and are easily nicked
or chipped.
BPI uses a process that was
developed to yield quality
blades that are uniquely suited
for corneal surgery. The
blades in the BPI trephines are
perfectly circular and are
a durable 0.3 mm thick, which
yields blades that are less
subject to accidental damage
that might be caused by the
surgeon or assistant during
preparation for the operation.
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To facilitate optimal
location of the trephine
as it is positioned on
the patient's eye,
fine cross-hairs are
incorporated inside each trephine
blade. These help physicians to align
the trephine with the center of
the desired cut. The cross-hairs are
positioned in a way
such that they are as
close to the surface of
the cornea as possible
without contacting the
epithelium. |
The blade is mounted in a spoke
adapter that allows the
blade to be precisely lowered at
a rate of 0.25 mm per each
revolution.
If you have Adobe Flash
installed as a plug-in,
you can observe the
movement of the blade as
the spokes are rotated.
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The Hessburg-Barron Vacuum
Trephines come in 11
diameters, ranging from
6.0mm to
9.0mm. There is a
family of donor
cornea punches
that can be used in
conjunction with the
Hessburg-Barron Vacuum
Trephines, the punch
sizes being available in
0.25 mm- diameter
increments to provide
flexibility in matching
donor tissue with the
incision made by the
trephine.
The Hessburg-Barron
Vacuum Trephines are available
directly from
Barron Precision
Instruments or from
JedMed Instrument
Company in the U.S.
and Canada, and
Altomed Ltd in
Europe.
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Part # |
Diam. |
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21-8260 |
6.0 mm |
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21-8265 |
6.5 mm |
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21-8270 |
7.0 mm |
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21-8272 |
7.25 mm |
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21-8275 |
7.5 mm |
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21-8277 |
7.75 mm |
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21-8280 |
8.0 mm |
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21-8282 |
8.25 mm |
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21-8285 |
8.5 mm |
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21-8287 |
8.75 mm |
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21-8290 |
9.0mm |
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