The cup body of these transducers
is molded of silicone. The vacuum line is made of silastic tubing 40 cm
long and terminates in a standard luer female hub. Under a light vacuum
the units pull down onto a blood vessel. The piezoelectric crystal is approximately
1 mm diameter and mounted at a 45-degree angle. The active surface faces
left as you stand at the lead side looking at the cup as it is applied
to the vessel. The crystal is encased in medical grade epoxy with an epoxy
Cup diameter: 26 mm
Vacuum: 0.8 mm silastic tubing, approx. 10 mm Hg vacuum required
Application: Used for monitoring aortic occlusions and for reactive
hyperemia. This size is meant for large animals such as horses, sheep,
cattle, large dogs etc.
Cup diameter: 7 mm
Vacuum: 0.8 mm silastic tubing, approx. 7 mm Hg vacuum required
Application: Used during surgery to determine patency of carotid
arteries and to record the reactive hyperemic response of the coronary
Cup diameter: 3 mm
Vacuum: 0.5 mm silastic tubing, approx. 3 mm Hg vacuum required
Application: This is the smallest, lightest vacuum probe available.
It is used on small animals to check for arterial patency or for determination
of the reactive curve. Typical applications include cat carotid and coronary
and rat carotid and coronary.