Description and operation

The rat tail plethysmograph is a non-invasive blood pressure meter. It has monitoring software and data storage.

It has two independent cuffs, one of which is connected to the sensor - where it identifies beats and swelling (with a maximum pressure of 30 mmHg), and another to the throttle - where the flow of blood from the tail of the rat is stalled (with a maximum pressure of 300 mmHg).

When the experiment starts, the beating is stagnated to 300mmHg, and begins to empty slowly. During emptying, when the onset of the beating (or onset of swelling) occurs, the device indicates the systolic pressure, and upon completion of the swelling, indicates the diastolic pressure. After the process, the sleeves are emptied.

Operation and measurement

For a correct and measured measurement, several steps are required that must be strictly followed:

- Pre-heating of the mouse in maximum external temperature 42ºC for 30 minutes, equipment already with heater.
- The animal should be immobilized by means of a container appropriate to its size.
- Placing of the sleeves according to the thickness of the tail of the animal, and can not be too tight or loose. For greater reliability of the measurements, the cuff should be placed in the same caudal position, avoiding variations of the blood flow constant. With the cuff on the tip of the mouse's tail the equipment will not work due to lower blood circulation.
- Sensitivity preset (pre-test). View the beats via softare and adjust the gain. This way the user can get the heart rate and can see it through graphs.

Technical specifications

- Model: Tail plethysmograph v 1.2 - single channel.
- Type of animal: Mice and Mice (over 20 grams)
- Maximum measured pressure: 250mmHg.
- Minimum measured pressure: 60mmHg.
- Heart rate: 180 to 1000 beats per minute.
- Comes with USB Software for monitoring
- Equipment bivolt - 127/220 VAC