pulled off the fiber bundles a uniform coating of adhesive is applied to the fibers when the adhesive cures the fibers are bonded to one another the excess fiber on the distal end of the multiple sensor can be cut off as required for insertion into the arterial cannula however a small length of excess optical fiber at the insertion end is required to bond the fibers together without bonding the sensing elements or applying adhesive thereto each individual sensor in the bundle can be attached to a separate fiber optic measuring system choices of adhesive include polyurethane or silicone rubber adhesive for flexible bonding and epoxys such as tracon fda yellow pre cured for one to two hours if a more rigid bundle is required the multiple sensor can be made of any number of individual sensors if needed plain fiber can be substituted for a sensor thereby retaining the structural support the overall size of the multiple sensor is determined by the number of sensors required and the diameter of each sensor the multiple sensor bundle will become less flexible as more sensors or fibers are added also the number of individual sensors and or plain fibers will be limited by the diameter of the arterial cannula used the multiple sensor of the present invention is easily used by direct insertion into an arterial cannula multiple sensors can be made which will readily fit a radial arterial cannula advantages of the multiple sensor of the subject invention are many the sensor bundles have uniform cross section a precisely determined diameter determined by the ferrules used to form them and do not require an outer support sleeve the bundles are sturdy but can be made as flexible.