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The Dual Wire Myograph System allows you to examine vascular reactivity and functional responses on small isolated arteries. Model 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. The Wire Interface with a touchscreen makes it easy to set up and use. MyoDAQ acquisition software is used to collect data. The data analysis is unique in being able to add multiple data selections throughout the course of the experiment in single or numerous channels. Data can be exported via a selection of the trace or the entire data file for external charting or custom analysis. |
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Wire Myograph Chamber# Ring-mounted segments - 30µm to 3mm # Fine scale micrometer for accurate tension control # Force range ±200mN # Acid resistent stainless steel chamber # Optical base window for imaging |
Interface Unit
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Chamber:
Chamber volume (Min): Chamber(s): Chamber sharpe: Chamber material: Vessel size: Vessel normalization: Micrometer resolution: Mounting type: |
2.7 ml 2 Square Acid-resistant stainless steel >30 µm Manually 0.01 mm Jaws |
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Temparature:
Range: Resolution: Stability: Heating: |
15.0 to 50.0 °C 0.1 °C ±0.2 °C Yes |
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Transducer:
Output reading: Range: Frequency range: Resolution: Force calibration: |
mN ±200 mN 0-20 Hz 0.01 mN Yes |
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Output:
Data communication: Analogue output channels: Analogue output range: |
USB 2.0 4 ±2.5 V |
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Need To Have:
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Nice To Have:
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