The Cox System of Pyrex Jones Tubes
More than 30 years ago, Lester T. Jones, M.D., of Portland, Oregon, established the superiority of Pyrex glass tubes over tubes of other materials for the conduction of tear fluid through a bed of scar tissue resulting from trauma or the congenital absence of tear ducts. Oculoplastic surgeons learned of these tubes at instructional courses at meetings of the American Academy of Ophthalmology from 1969 to the present.
In 1970 we began manufacturing and furnishing them in convenient sets with the instruments to insert them. At the Callahan Eye Foundation Hospital many such tubes have been surgically emplaced using the system. CW Cox, Jr, reported the first model of the Cox System for Jones Tubes in the American Journal of Ophthalmology, Vol. 72, page 931 (1971).
Many well-known Oculoplastic surgeons have worked with the Callahans: father and son, Dr. Thomas C. Naugle, Jr. (New Orleans), Dr. Bernice Z. Brown (Los Angeles), Dr. Orkin George Staiser (Albany, NY) to name a few. They and many others helped me to improve on the design of the tubes as well as the instruments. I must credit Dr. Alston Callahan with much of the success of The Cox System for Jones Tubes as he constantly challenged us to improve it.
The outside diameter of the standard Callahan/Cox tube (the Jones tube as modified) is 3 mm, and they are available in 1 mm increments from 10 to 31 mm in length. To prevent downward slippage, the standard flanges on top are 4.5 and 5.5 mm, but may be made in any flange diameter and length on special order.
Oculoplastic surgeons from all over the USA and several foreign countries use and recommend the Cox System for Jones Tubes. We take great pride in helping surgeons with their patients and have constantly improved the original design of Jones tubes and the instruments to emplace them.