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US4079730A
Expired / Lapsed
US
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Apparatus for measuring externally of the human body magnetic susceptibility changes
Assignee: Leland Stanford Junior University
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Filing: 1976-06-21
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Granted: 1978-03-21
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Expires: 1996-06-21
Abstract
Abstract An apparatus for measuring externally of the human body magnetic susceptibility changes within the body particularly the human heart and interpreting these changes in order to quantify the flow of blood.
Inventors
- 👤 John P. Wikswo, Jr.
- 👤 William M. Fairbank
- 👤 James E. Opfer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:50
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/12; G01R33/16; A; A61; A61B; A61B5/00; A61B5/02; A61B5/026; A61B5/0265; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/842; Y10S505/843
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
89 words
Apparatus for measuring changes in the magnetic susceptibility of selected portions of a living body placed adjacent thereto comprising means providing a supercooled volume, a magnet disposed in said supercooled volume to generate a magnetic field which extends outside of said volume into said selected portions of the adjacent living body, a magnetometer disposed in said supercooled volume and adapted to measure changes in the magnetic field in said volume indicating changes in susceptibility of said adjacent body portions, and means for processing said signals to indicate said changes.
Claim 2
Dependent Claim
89 words
Apparatus for measuring changes in the magnetic susceptibility of selected portions of a living body placed adjacent thereto comprising means providing a supercooled volume, a magnet disposed in said supercooled volume to generate a magnetic field which extends outside of said volume into said selected portions of the adjacent living body, a magnetometer disposed in said supercooled volume and adapted to measure changes in the magnetic field in said volume indicating changes in susceptibility of said adjacent body portions, and means for processing said signals to indicate said changes.
Claim 3
Dependent Claim
15 words
Apparatus as in claim 1 wherein said means forming said supercooled volume comprises Dewar flasks.
Claim 4
Dependent Claim
15 words
Apparatus as in claim 1 wherein said magnetometer is a super conducting quantum interference device.
Claim 5
Dependent Claim
11 words
Apparatus as in claim 1 wherein said magnet is an electromagnet.
Claim 6
Dependent Claim
19 words
Apparatus as in claim 1 wherein said magnetometer is a gradient magnetometer positioned rigidly with respect to said magnet.
Claim 7
Dependent Claim
21 words
Apparatus as in claim 1 in which said magnetometer includes means for determining the magnitude and direction of the magnetic field.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-20 | 1981-09-19 | 1982-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-20 | 1985-09-19 | 1986-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-20 | 1989-09-19 | 1990-03-21 | $7700.00 | Window Closed / Lapsed |