Sensor and guide wire assembly

(54) SENSOR AND GUIDE WIRE ASSEMBLY

(75) Inventors: Ola Hammarstrom, Lerdala; Per Benkowski, Uppsala; Par von Malmborg, Uppsala; Lars Tenerz,

Uppsala, all of (SE)

(73) Assignee: Radi Medical Systems AB, Uppsala (SE)

( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.

(21) Appl. No.: 09/662,925

(22) Filed: Sep. 15, 2000

Related U.S. Application Data

(62) Division of application No. 09/349,980, filed on Jul. 9,1999,

now Pat. No. 6,142,958. (60) Provisional application No. 60/113,810, filed on Dec. 23,

1998.

(51) Int. CI.7 A61B 5/00; A61M 25/00

(52) U.S. CI 600/585; 600/434

(58) Field of Search 600/433, 434,

600/435, 485, 486, 504, 505, 585, 561

(56) References Cited

U.S. PATENT DOCUMENTS

4,456,013 A 6/1984 De Rossi et al 128/675

4,722,348 A 2/1988 Ligtenberg et al 128/675

5,226,423 A * 7/1993 Tenerz et al 600/486

5,372,144 A * 12/1994 Mortier et al 600/585

5,404,887 A * 4/1995 Prather 600/585

5,490,323 A 2/1996 Thacker et al 607/122

5,517,989 A 5/1996 Frisbie et al 600/585

RE35,648 E 11/1997 Tenerz 128/673

5,715,827 A 2/1998 Corl et al 128/673

5,749,371 A 5/1998 Zadini et al 600/585

5,779,643 A 7/1998 Lum et al 600/462

5,931,819 A 8/1999 Fariabi 604/525

5,938,624 A 8/1999 Akerfeldt et al 600/585

5,967,976 A * 10/1999 Larsen et al 600/374

6,106,486 A * 8/2000 Tenerz et al 600/585

FOREIGN PATENT DOCUMENTS

EP 0 738 495 10/1996

EP 0 879 616 11/1998

WO 90/01294 2/1990

WO 97/00641 6/1996

WO 97/27802 1/1997

* cited by examiner

Primary Examiner—Robert L. Nasser

Assistant Examiner—Charles Marmor, II

(74) Attorney, Agent, or Firm—Foley & Lardner

(57) ABSTRACT

A sensor and guide wire assembly includes a core wire having a distal end, a proximal end, and a plurality of sections of different cross sections and thereby different flexibilities. At least one of the core wire sections has an enlarged portion with a sensor receptacle therein. The assembly also includes a tube that encloses the core wire over at least a fraction of its length such that the core wire extends out from a distal end of the tube. The tube is configured to enable the sensor and guide wire assembly to be inserted into an artery and to be passed to a measurement site inside a patient's body. The assembly further includes a sensor mounted in the sensor receptacle of the enlarged portion of the core wire. A first coil is arranged to enclose a first portion of the core wire extending out from the distal end of the tube, and the first coil is located nearer to the proximal end of the core wire than the sensor. A second coil is arranged to enclose a second portion of the core wire extending out from the distal end of the tube. The second coil is located nearer to the distal end of the core wire than the sensor.

10 Claims, 5 Drawing Sheets