EP0165742B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Catheter for use with nmr imaging systems
Assignee: Varian Inc
•
Filing: 1985-06-05
•
Granted: 1990-05-23
•
Expires: 2005-06-05
Abstract
No abstract record available.
Inventors
- 👤 Robert Smith Codrington
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 18:26
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/01; A61M25/0105; A61M25/0127; G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/285; A61B; A61B90/00; A61B90/39; A61B2090/3954; A61B2090/3958
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
63 words
A magnetic resonance imaging system for obtaining the spatial distribution of a selected magnetic parameter characterizing tissue constituents of a subject comprising a catheter (26) for insertion into said subject, said catheter (26) comprising means for controllably disturbing the magnetic field in the vicinity of a local portion of said catheter and thereby interacting with the remainder of said magnetic resonance imaging system.
Claim 2
Dependent Claim
63 words
A magnetic resonance imaging system for obtaining the spatial distribution of a selected magnetic parameter characterizing tissue constituents of a subject comprising a catheter (26) for insertion into said subject, said catheter (26) comprising means for controllably disturbing the magnetic field in the vicinity of a local portion of said catheter and thereby interacting with the remainder of said magnetic resonance imaging system.
Claim 3
Dependent Claim
103 words
A system as claimed in Claim 1, said catheter (26) comprising: a hollow sheath (30) comprising a flexible elongate insulator, said means for controllably disturbing comprising a pair of conductive strips (32,32') imbedded in said insulator and extending substantially the length thereof, the system further comprising conductive loop means (36) imbedded in said sheath (30) and disposed proximate to one end thereof, said loop (36) mutually connecting said conductive strips (32, 32'), and excitation means (28) for applying a selectable current through said conducting strips and thence through said loop (36) whereby a controllable dipole magnetic field is achieved in the vicinity thereof.
Claim 4
Independent Claim
67 words
A method of investigating the spatial relationship of a catheter within a body to organs within said body comprising: exciting a weak magnetic field atthe terminus of said catheter, and forming a magnetic resonance image of said volume whereby said magnetic resonance image is locally perturbed in the neighbourhood of said weak magnetic field and the location of said catheter in relation to said organs is determined.
Claim 5
Independent Claim
67 words
A method of investigating the spatial relationship of a catheter within a body to organs within said body comprising: exciting a weak magnetic field atthe terminus of said catheter, and forming a magnetic resonance image of said volume whereby said magnetic resonance image is locally perturbed in the neighbourhood of said weak magnetic field and the location of said catheter in relation to said organs is determined.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.