The use of oximetry in determining intestinal blood flow

A variable pressure spray apparatus is provided having a pressurizable fluid storage vessel connected to a pressurized gas cylinder. The spray apparatus is self contained and does not require an external power supply. A hand pulled support cart is adapted to support a removable tray that is capable of carrying the storage vessel and the pressurized cylinder. The combination of the cart and tray with the spray apparatus permits an operator to carry his equipment with him to previously inconvenient and inaccessible locations with regards to conventional spray equipment.