klemmen vascular clampsWhat started as a laboratory tool fifty years ago, has become the most popular micro clamp due to the many advantages this clamp series has for its users:


Please choose from the following products:

  • Acland - Matte Finish
  • Acland - Black Finish
  • Acland, angulated - Matte Finish
  • Acland, angulated - Black Finish
  • Clamp Applying Forceps
  • Disposable Vascular Clamps, Single
  • Disposable Vascular Clamps, Double


Clamp Security

Precisely calibrated closing force, which is 100 % quality controlled and inspected, with a secure working grip surface, providing impressive security in use, against both slippage and leakage. S&T's clinical micro clamps are the gentiest and least traumatic of all small vessel clamps. Now all clamps of the "B" series are marked to advise the surgeon on vessel sizes.

Acland® is a registered trademark of S&T AG.


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. This helps you avoid over-pressure peaks, which may easily lead to trauma of the vessel interior.

Clamp size

In choosing the correct clamp size for your application, please refer to the section Clamp Size and Clamp Pressure.

«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 against slippage.


Black or Plane 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. The matte finish features a dark gray, minimally reflective surface. The selection of a black or matte finish clamp is a matter of preference.

Clamp Size and Clamp Pressure

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 size. Each size of clamp has its own different and carefully calibrated closing force. Each clamp size is designed for a specific range of vessel diameters.

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.


Even on the largest, recommended diameter vessel (Fig. below), 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, large or small, remains consistent throughout the series. Each size of clamp exerts a pressure of 5gm/mm 2 when used on the largest vessel in its range, and 15gm/mm 2 when used on the smallest vessel. Even at the higher range, S&T's clinical micro clamps have the gentlest working pressure of any small vessel clamp available.

'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 handling of the vessel. 

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 cleaning solution. 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 remove any accumulated debris from 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 suture cleats.

Applying the Clamps

RD and HD clamps are designed to be applied by hand. Their broad, corrugated gripping surfaces make this easy. The three smaller sizes, B-1, B-2, and B-3, are designed to be applied with the Meyer clamp applicator forceps. The forceps are direct acting. When the forceps are squeezed, the clamp opens. When held in the forceps, the clamp can be manipulated firmly in any plane without the danger of slipping or falling out. Clamp applicator forceps are available with or without a lock.

Prof. Dr. Viktor E. Meyer, University Hospital Zurich, Zurich, Switzerland

Important!Applying the three smaller sized B-clamps by hand may damage the calibration. Please use the clamp applying forceps for it.








Vessel Dilators


Vascular Clamps


Special Instruments


Instrument Sets



Tobelraastrasse 2
CH-8212 Neuhausen
Telephone: +41 52 672 7407
Fax: +41 52 672 7402

S&T Medical GmbH
Bachstrasse 3
D-79798 Jestetten

S&T AG and S&T Medical GmbH are
subsidiaries of Stille AB

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