CATHETER HAVING DURABLE AND FLEXIBLE SEGMENTS

摘要

An epidural catheter is disclosed having a durable and a flexible segment joined together. The flexible segment is inserted into a patient with the use of a well-known needle which is removed by passing the needle over the outside of the catheter. The flexible segment is atraumatic to the surrounding tissue. The flexible segment includes a plastic tube surrounded by a wire coil for pushing the tube into a passageway of the tissue. The distal end of the plastic tube and wire coil are joined to prevent unwinding of the coil when extracted. The tightly coupled wire coil also permits the flexible portion to be easily inserted into the passageway of the tissue. The durable segment joined to the flexible segment includes a stainless steel tube with a flat wire coil surrounding a length of the tube. The stainless steel tube permits fluid at an elevated pressure to pass through the hollow passageway therein without rupturing. The flat wire coil prevents kinking of the semi-rigid stainless steel tube. When a fluid at an elevated pressure is received, the distal end of the flexible tube is closed to diffuse the fluid passing through the length of the catheter. Slits are provided laterally on the side of the plastic tube for emitting and diffusing the fluid through the wire coil. 16