A catheter or catheter sheath introducer, for insertion into a vessel of a patient. The catheter has a rigid housing at its proximal end. The housing has an annular valve for access to the lumen of catheter. The catheter further includes a flexible tube for insertion into the patient. Lastly, the...http://www.google.es/patents/US5807350?utm_source=gb-gplus-sharePatente US5807350 - Kink resistant catheter sheath introducer
