Patent US3900290A successfully refreshed from Google Patents.
US3900290A
Expired / Lapsed
US
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Method and apparatus for determining the degree of platelet aggregation in blood
Assignee: INT OCTROOI MIJ OCTROPA NL1973
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Filing: 1974-03-12
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Granted: 1975-08-19
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Expires: 1994-03-12
Abstract
Abstract The apparatus consists of a filter which allows blood cells to pass but precludes passage of aggregated platelets. A sample supply of blood is fed via the filter to a suction pump by tubing, and the pressure drop is measured across the filter.
Inventors
- 👤 Gerard Hornstra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:35
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/483; G01N33/487; G01N33/49; G01N33/4905
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
75 words
AN APPARATUS FOR DETERMINING THE DEGREE OF PLATELET AGGREGATION IN BLOOD COMPRISING, CONNECTED IN SERIES BY TUBING, SAMPLE SUPPLY MEANS FOR SUPPLY OF A SAMPLE OF BLOOD TO BE EXAMINED, A FILTER HAVING A PORE SIZE WHICH ALLOWS RED AND WHITE BLOOD CELLS TO PASS BUT PREVENTS PASSAGE OF AGGREGATED PLATELETS, A PUMP FOR DRAWING BLOOD FROM SAID SUPPLY AND THROUGH THE FILTER, AND PRESSURE MEASURING MEANS FOR MEASURING THE PRESURE DROP ACROSS THE FILTER.
Claim 2
Independent Claim
75 words
AN APPARATUS FOR DETERMINING THE DEGREE OF PLATELET AGGREGATION IN BLOOD COMPRISING, CONNECTED IN SERIES BY TUBING, SAMPLE SUPPLY MEANS FOR SUPPLY OF A SAMPLE OF BLOOD TO BE EXAMINED, A FILTER HAVING A PORE SIZE WHICH ALLOWS RED AND WHITE BLOOD CELLS TO PASS BUT PREVENTS PASSAGE OF AGGREGATED PLATELETS, A PUMP FOR DRAWING BLOOD FROM SAID SUPPLY AND THROUGH THE FILTER, AND PRESSURE MEASURING MEANS FOR MEASURING THE PRESURE DROP ACROSS THE FILTER.
Claim 3
Dependent Claim
40 words
An apparatus according to claim 1 comprising one additive substance supply means arranged for addition of additive substance to the blood sample prior to passage through the filter, and mixing means for mixing the additive substance with the blood sample.
Claim 4
Dependent Claim
24 words
An apparatus according to claim 1 in which the pump is mounted downstream of the filter and is arranged to operate at constant speed.
Claim 5
Dependent Claim
21 words
An apparatus according to claim 2 in which the mixing means and the filter are arranged as on integral replaceable unit.
Claim 6
Dependent Claim
16 words
An apparatus according to claim 1 in which the pump is mounted downstream of the filter.
Claim 7
Independent Claim
66 words
A method for determining the degree of platelet aggregation in blood comprising the steps of: providing a sample supply of blood to be examined, passing the sample of blood through a filter which allows red and white blood cells to pass but prevents passage of aggregated platelets, and measuring the pressure drop across said filter to indicate the degree of platelet aggregation in said blood sample.
Claim 8
Independent Claim
66 words
A method for determining the degree of platelet aggregation in blood comprising the steps of: providing a sample supply of blood to be examined, passing the sample of blood through a filter which allows red and white blood cells to pass but prevents passage of aggregated platelets, and measuring the pressure drop across said filter to indicate the degree of platelet aggregation in said blood sample.
Claim 9
Dependent Claim
17 words
The method in accordance with claim 6 wherein the sample of blood is drawn through said filter.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |