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The Equitainer Technology

Below is a brief explanation of the cooling process of the Equitainer I. For a schematic diagram of the sample and Equitainer components inside the Equitainer I, click here.

So just how does the Equitainer cool the semen sample at the optimum rate and maintain it at a final temperature for the best fertility outcomes? Well, this is where it starts to get a bit technical, so please bear with us!

The Equitainer technology works by a method called "thermal conduction," in which heat is transferred between two solid objects in contact with each other. (While the term "heat" may seem contradictory to what you might expect in a cooling system, it simply means that heat is removed from the sample, instead of coldness being sent into the sample.) Thus, when then Isothermalizer containing the sample is placed in contact with the Freezer Cans, heat is drawn out of both the Isothermalizer and the sample it contains. The x-ray shielding, which both lines the Isothermalizer wells and Isothermalizer bottom, assists in this heat transfer process. This is why it is crucial that there is direct contact between the sample and the Isothermalizer, and that both wells of the Isothermalizer are filled (this is also why the older model Equitainer requires the use of Ballast Bags).

However, unless this heat removal process is controlled, the sample will be cooled too quickly. This is where the Isothermalizer truly comes into play. The vinyl base of Isothermalizer acts as a "thermal impedance" that precisely controls the rate at which heat is removed from the sample. Without the use of a thermal impedance barrier, the sample may cool too quickly, resulting in "cold shock" to the sperm. Cold shock has been shown to dramatically reduce the viability and fertilizing capacity of equine sperm.

Note: Due to its differences in structure and components, the Clipper does not require use of a thermal impedance to achieve the proper cooling rate.

The insulating capacity of the Equitainer helps maintain the interior temperature, regardless of the external conditions. Also, since the design of the Equitainer keeps all contents in direct contact, its position during shipping does not affect the cooling rate. The Equitainer takes approximately 10 hours to reach its final internal temperature of 5ºC (42ºC). The length of time the final temperature is held depends on the Equitainer model - with the Equitainer I offering the longest sample maintenance.

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Schematic Diagram of the Inside of Equitainer when Loaded with Sample (tube style Isothermalizer)


Schematic Diagram of the Inside of Equitainer when Loaded with Sample (cup style Isothermalizer)