The Original Micro
Prof. Dr. Robert D. Acland, University of Louisville,
Louisville. Ky. USA
What started as a laboratory instrument over thirty years ago,
has become the most popular micro clamp due to the many
advantages this clamp series has for its users:
■ light and compact design
■ extremely durable
■ corrosion resistant metallurgy
■ a unique gripping surface
■ smooth sliding bar action on all approximator clamps v clamp
profile with parallel sided jaws
■ choice of matte or black finish
Offering a range of 5 sizes, the
micro clamp series will meet the most exacting needs of small
vessel surgery in the diameter range from 0.4 to 5 mm.
clamps are precisely calibrated to exacting standards. All
undergo a rigorous QC testing procedure.
are 100% inspected prior to shipment.
clinical micro clamps are the gentlest and least traumatic of
all small vessel clamps.
The flat and non-serrated „Ultra-Grip“ surface of these clamps
ensures that the pressure is spread evenly over the entire area
of the vessel wall. Minimizing overpressure peaks, which may
lead to damage of the vessel interior.
Options Clamp size?
In choosing the correct clamp size for your application, please
refer to the section „Clamp Size and Clamp Pressure“ below.
"A" or "V" Pattern?
Throughout the series, the „V“ pattern is the all-purpose clamp,
commonly used on all veins, and almost all arteries. The „A“
pattern, available in all sizes, is designed for exceptionally
thick-walled vessels and slippery arteries. The slight incurve
of the tips of the „A“ pattern jaw provides extra security
Black or Plain Finish?
All clamps are now available in either a black or matte (dark
gray) finish. The black finish helps minimize eye fatigue, and
also helps avoid burned-out highlights in photography and on-screen.
finish features a dark gray, minimally reflective surface. The
selection of a black or matte finish clamp is matter of
Clamp Size and
When choosing the right size of clamp for your work, clamp
pressure is an important consideration. Clamp pressure is
determined by the closing force of the clamp (in grams), divided
by the area of the vessel wall that is compressed between the
jaws (in square millimeters). Thus, the smaller the area, the
higher the pressure is, inversely proportional to the vessel
Each size of clamp has its own different and carefully
calibrated closing force. Each clamp size is designed for a
of vessel diameters (Fig. 1).
Even on the largest, recommended diameter vessel (Fig. 2), each
size of clamp will withstand blood pressure within the vessel up
to 200 mm Hg, without leakage.
Despite the wide range of closing forces, the pressure exerted
by each clamp, big or small, remains consistent throughout the
series. Each size of clamp exerts a pressure of 5gm/mm2 when
used on the largest vessel in its range, and 15gm/mm2 when used
on the smallest vessel. Even at the higher range,
clinical micro clamps have the gentlest working pressure of any
small vessel clamp available.
The table (Fig. 2) summarizes the relationship between clamp
size, recommended vessel diameter and clamp pressure.
„Vessel diameter“ refers to the external diameter of the vessel
in its natural state of full dilation. There is a 50% overlap in
the recommended vessel diameter range, between each clamp size
and the next larger or smaller size. Thus, for every vessel
diameter, with the exception of those at the extreme ends of the
range, there will
always be two suitable clamps. Whenever a choice arises, the
smaller clamp should be selected to ensure a gentler, less
pressured handling of the vessel.
■ Marking shows the appropriate position of vessels
■ Border lines show the range of the vessel diameters - The
outer lines designate the maximum vessel diameter - The inner
lines designate the minimum vessel diameter
logo: The certainty that you are using authentic
Dimensions (in mm)
Single clamps Single
clamps are used in situations where space is at a premium and
you find it difficult to place an approximator clamp.
Generally you will use single clamps when you are working on
end-to-side anastomosis and you need safe haemostasis on the
Approximator clamps are the standard clamps for end-to-end
anastomosis or if the recipient vessel on an end-to-side
anastomosis is to be clamped and approximated. The ease with
which vessel ends may be positioned as well as the exceptional
access to the procedure site has made these clamps top sellers.
Care of Clamps
Micro clamps are prone to damage from the accumulation of blood
clotting in tight places. With proper care and cleaning, this
can be avoided. Blood should not be allowed to dry on the clamps
during surgery. For cleaning after surgery, we recommend
immersion for 30 minutes in hemolytic detergent (please also
note the section on „Decontamination“). When immersing the
clamps, hold them open for a moment to wet the inner surfaces.
Be sure to slide approximator clamps along the bar, back and
forth a few times, to clear the sliding units. After immersion,
rinse vigorously with a fine, high-pressure water jet to remove
any blood residue from spring interspaces, sliding units and
These clamps are generally used in labs or in instances where
there is no assistance available. The cleats on the frame are
used for belaying the suture material, ensuring perfect
positioning during an anastomosis.
Do not use a clamp on a vessel below the recommended diameter
range. Use of any clamp on a vessel too small will result in
unacceptably high pressure, and risk of vessel damage.
Clamps by Acland,
These handy clamps are recommended for use in places where
straight clamps either are difficult to apply, or obstruct sight
in the operative field.
Advantages of the single use clamps
■ Sterile, single use, disposable
■ atraumatic jaws
■ consistent and reliable closing pressure
■ designed for use on veins and arteries
■ light weight
■ blue finish provides excellent contrast in the field
■ eliminates cleaning and processing problems
sizes B-1, B-2, B-3
sizes HD-S, RD-S
sizes B-1, B-2, B-3
sizes HD-S, RD-S
lock, 15 cm
sizes B-1, B-2, B-3
70 x 45 mm
Ensures the safekeeping of your vessel clamps during the
procedure and cleaning.