A catheter has an abutment member formed proximate the distal end thereof. The abutment member abuts a complimentary abutment surface formed upon an introducer so as to prevent collapsing of the catheter body during the insertion process. The abutment member preferably comprises an annular abutment shoulder,...http://www.google.es/patents/US5533988?utm_source=gb-gplus-sharePatente US5533988 - Over-the-needle catheter
