United States Patent [i9]
Thompson et al.
 IDENTIFICATION RING FOR CATHETER
 Inventors: Russell B. Thompson, Los Altos;
David McGee, Palo Alto, both of Calif.
 Assignee: EP Technologies, Inc., Sunnyvale, Calif.
 Appl. No.: 338,336
 Filed: Nov. 14,1994
 Int. CI.6 A61M 5/00
 U.S. CI 604/264; 604/95; 604/111;
 Field of Search 604/95, 280, 281,
604/282, 159, 264, 111, 189, 100, 283;
 References Cited
U.S. PATENT DOCUMENTS 5,199,950 4/1993 Schmitt et al 604/282 X
US005489275A [li] Patent Number: 5,489,275  Date of Patent: Feb. 6,1996
5,219,332 6/1993 Nelson et al 604/95
5,267,573 12/1993 Evans et al 604/95 X
5,273,535 12/1993 Edwards et al 604/95
Primary Examiner—John D. Yasko
Attorney, Agent, or Firm—Ryan, Maki & Hohenfeldt
A catheter assembly which has a distal end adapted for insertion into a living body and a proximal end adapted to remain external to said body or a cable for use in such an assembly includes a cylindrical surface on which are inscribed a plurality of markings. Each of the markings indicates one of the specific locations within the living body at which the distal end may be placed during insertion. The markings are positioned at spaced intervals around the circumference of the cylindrical surface. A sleeve is rotatably and/or axially movable around the cylindrical surface, the sleeve being provided with at least one window adapted to be moved into alignment with a selected one of the markings.
13 Claims, 4 Drawing Sheets