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Reentrant Cannulation of the Small Intestine in Sheep: Cannula and Surgical Method^{1 ,2,}

Animal Research Institute, Agriculture Canada, Ottawa, Ontario, Canada K1A 0C6 and and Electrical Engineering Division, National Research Council, Ottawa, Ontario, Canada K1A 0R8

Abstract

The function, design and production of a reentrant cannula for the small intestine of sheep and the corresponding surgical procedure are described. The cannula is molded in one piece from polyvinylchloride plastisol. It consists of a curved intestinal tube joined to a stem with a external elliptical ring on the distal end and a perforated flange that encircles the stem above the intestinal tube. A circular perspex valve with two curved channels was made to fit into the interior of the cannula, making it capable of either a "maintenance" or a "collection" function. The cannula was inserted into the proximal duodenum and(or) terminal ileum of sheep via a 5 -cm incision on the antimesenteric side of the intestine. The intestine was attached to the cannula by a Dacron straight arterial graft. This reentrant cannulation method does not require an intestinal transection and a mesenteric incision under the transection. Therefore, little damage was done to the blood and nervous systems. The sheep were fed silages before and after surgery, and several collections of digesta were made. No blockage by digesta of either duodenal or ileal cannulas were observed.

¹ The cannula is commercially produced by the Ketchum Manufacturing Sales Ltd., 396 Berkley Avenue, Ottawa, Ontario, Canada K2A 2G6.

² The authors gratefully acknowledge the technical contribution of R. Wilke, M. Willems, D. Milne and D. Taylor in the construction of the molds. The assistance of M. K. Bryan, H. Mode, J. F. Shackleton and F. W. Fisher with surgery is also acknowledged. The authors also wish to thank Dr. R. S. Gowe, Director of the Animal Research Institute, for his encouragement and advice during this project.

An abstract of this work was presented at the Vth International Symposium on Ruminant Physiology, Clermont-Ferrand, September 3–7, 1979, and published in Ann. Rech. Vet. 10:288, 1979.

³ Contribution No. 913 from the Animal Research Institute.

⁴ Contribution No. NRC 18154 from the Electrical Eng. Div.