The Dual Wire Myograph System - 420A is ideal for testing two vessels with diameters of 30 μm simultaneously - 3 mm, independently. The vessels are mounted as ring preparations by threading them over two parallel wires and securing the wires to two supports or “jaws.” One support is attached to a precision micrometer, allowing manual control of vessel circumference and stretch. The other support is attached to a force transducer for the measurement of force/tension development.
The base of the chamber contains glass windows allowing morphological observations or fluorescence measurements on an inverted microscope. Typically, the preparation is kept in the heated vessel chamber in a physiological salt solution at 37°C, bubbled with oxygen where the vessels remain viable for at least 12 hours
The preparation is mounted in a heated 10 ml acid-resistant stainless steel chamber, which can be covered with a lid with ports for rapid suction/draining, refilling, and bubbling of oxygen supply. Following mounting and equilibration, the passive length-tension relationship of the vessel is determined. During the actual experiment, the circumference of the vessel is kept constant. Compounds can be added directly to the chamber, and the vessel’s contractility and reactivity are measured under isometric conditions.
In the Dual Wire Myograph System - 420A, the chamber can be divided for independent testing of each vessel. The two vessels also can be mounted in a single chamber by removing the divider. This allows direct comparative studies of vessels from treated/untreated conditions or diseased vs. healthy patient samples, for example, by exposing the vessels to identical concentrations of drug or compound. It is thus possible to examine whether a given pathological state is associated with altered morphology or reactivity.
As an option, an electronic valve can be added to the system for easy control and emptying of the chamber. The Wire Interface with a touch screen makes it easy to set up and use.
Furthermore, the Wire Interface is compatible with the DMT Device En-abler allowing automatic recognition of supported devices by LabChart, use of multiple devices simultaneously, correct units and ranges in LabChart channels, and simultaneous recording of data into LabChartalongside a PowerLab. The DMT Device Enabler allows the Dual WireMyograph System - 420A to stream data directly into LabChart by ADInstruments.
*1 2-Years of warranty included in purchase