Patent US3670715A successfully refreshed from Google Patents.
US3670715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for measuring the flow of blood
Assignee: US Philips Corp
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Filing: 1970-02-11
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Granted: 1972-06-20
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Expires: 1990-02-11
Abstract
Abstract a. The device according to the invention permits of measuring the flow of liquids which contain oxygen, especially blood flow. B. It comprises a pulsed neutron source which partly irradiates the liquid; the oxygen O16 of the liquid is converted into N16 which emits radiation. A detector measures the radioactivity of the liquid as a function of flow. C. The device can be used especially in medical diagnosis for measuring blood flow, for example cardiac output, arterial flow or the supply of blood to an organ.
Inventors
- 👤 Jean Robert Perilhou
- 👤 Michel Joseph Auphan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:24
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/704; G01F1/708; A; A61; A61B; A61B5/00; A61B5/02; A61B5/026; A61B5/0275; G01F1/7042; G01N; G01N23/00; G01N23/22; G01N23/221; G01N23/222; G01N2223/00; G01N2223/07; G01N2223/074; G01N2223/0745
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
109 words
A method for measuring the cardiac output of a heart in an animal body, comprising the steps of irradiating a substantially cylindrical portion of said body including the heart with a dose of neutrons at the instant ventricles of the heart are filled with blood, measuring gamma radiation level emitted by the irradiated portion of the body immediately after the irradiation in a shadow region with respect to the dose of neutrons, measuring gamma radiation level emitted by the irradiated portion of the body at the end of a contraction of the ventricles in said shadow region and determining the difference in the levels of the gamma radiation measurements.
Claim 2
Independent Claim
109 words
A method for measuring the cardiac output of a heart in an animal body, comprising the steps of irradiating a substantially cylindrical portion of said body including the heart with a dose of neutrons at the instant ventricles of the heart are filled with blood, measuring gamma radiation level emitted by the irradiated portion of the body immediately after the irradiation in a shadow region with respect to the dose of neutrons, measuring gamma radiation level emitted by the irradiated portion of the body at the end of a contraction of the ventricles in said shadow region and determining the difference in the levels of the gamma radiation measurements.
Claim 3
Independent Claim
82 words
A method for measuring the cardiac output of a heart in an animal body comprising the steps of irradiating a substantially cylindrical portion of said body including the heart with a dose of neutrons at the instant ventricles of the heart are filled with blood, and measuring the gamma radiation level emitted by a part of the body outside said irradiated portion at the end of a contraction of the ventricles in a shadow region with respect to the dose of neutrons.
Claim 4
Independent Claim
82 words
A method for measuring the cardiac output of a heart in an animal body comprising the steps of irradiating a substantially cylindrical portion of said body including the heart with a dose of neutrons at the instant ventricles of the heart are filled with blood, and measuring the gamma radiation level emitted by a part of the body outside said irradiated portion at the end of a contraction of the ventricles in a shadow region with respect to the dose of neutrons.
Claim 5
Independent Claim
99 words
A device for measuring the cardiac output in an animal body comprising a pulsed neutron source contained within a neutron absorbing envelope having an opening adapted to emit a substantially cylindrical beam of neutrons, a radiation detector to measure gamma radiation, screening means to prevent neutrons from said neutron source and gamma radiation from the region that has been irradiated by said beam of neutrons from reaching the radiation detector along a direct path, and absorbing means adapted to compensate for gamma radiation reduction in accordance with distance between the radiation detector and a point of gamma radiation emission.
Claim 6
Independent Claim
99 words
A device for measuring the cardiac output in an animal body comprising a pulsed neutron source contained within a neutron absorbing envelope having an opening adapted to emit a substantially cylindrical beam of neutrons, a radiation detector to measure gamma radiation, screening means to prevent neutrons from said neutron source and gamma radiation from the region that has been irradiated by said beam of neutrons from reaching the radiation detector along a direct path, and absorbing means adapted to compensate for gamma radiation reduction in accordance with distance between the radiation detector and a point of gamma radiation emission.
Claim 7
Dependent Claim
30 words
A device as claimed in claim 3, wherein the radiation detector is opposite the neutrons emitting opening and the screening means is located between said radiation detector and said opening.
Claim 8
Dependent Claim
32 words
A device as claimed in claim 3, wherein the radiation detector is located next to a lateral wall of said envelope and the screening means forms a part of said lateral wall.
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |