US4097238A
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US
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Method of analyzing blood plasma clotting
Assignee: Individual
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Filing: 1977-06-03
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Granted: 1978-06-27
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Expires: 1997-06-03
Abstract
Abstract Citrated platelet-rich blood plasma is added to Tc 99m macroaggregated albumin or Tc 99m human serum albumin microspheres and counted in a well scintillation counter to provide the preclot count. Calcium chloride is added to the combination to initiate the clotting process. An anticoagulant is added to the solution after the formation of a clot to terminate the clot reaction. The residual clot is washed in a normal saline solution. The washed clot is resuspended in a saline solution and is recounted in the well scintillation counter to provide the post-clot count and the clotting time.
Inventors
- 👤 Sheldon J. Ashley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:50
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/86
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
102 words
A method of analyzing blood plasma clotting, comprising the steps of citrating platelet-rich blood plasma; adding a Tc 99m tagged particulate to the plasma; counting the radioactivity of an aliquot of the citrated plasma with added particulate thereby providing the pre-clot count; adding calcium chloride solution to initiate the clotting process; adding an anticoagulant to the solution after the formation of a clot to terminate the clot reaction; washing the residual clot in a normal saline solution; resuspending the washed clot in a saline solution; and recounting the radioactivity of the resuspended clot to provide the post-clot count and the clotting time.
Claim 2
Independent Claim
102 words
A method of analyzing blood plasma clotting, comprising the steps of citrating platelet-rich blood plasma; adding a Tc 99m tagged particulate to the plasma; counting the radioactivity of an aliquot of the citrated plasma with added particulate thereby providing the pre-clot count; adding calcium chloride solution to initiate the clotting process; adding an anticoagulant to the solution after the formation of a clot to terminate the clot reaction; washing the residual clot in a normal saline solution; resuspending the washed clot in a saline solution; and recounting the radioactivity of the resuspended clot to provide the post-clot count and the clotting time.
Claim 3
Dependent Claim
16 words
A method as claimed in claim 1, wherein the particulate is Tc 99m human albumin microspheres.
Claim 4
Dependent Claim
15 words
A method as claimed in claim 1, wherein the particulate is Tc 99m macroaggregated albumin.
Claim 5
Dependent Claim
16 words
A method as claimed in claim 1, wherein the particulate is Tc 99m human serum albumin.
Claim 6
Independent Claim
199 words
A method of analyzing blood plasma clotting, comprising the steps of adding platelet-rich plasma to a radionuclide to form a solution; swirling the solution; incubating the swirled solution in a water bath at a predetermined temperature for a predetermined period of time; adding calcium chloride reagent to the swirled solution; gently tilting the solution periodically while it is in the bath; adding Heparin at a predetermined period of time after the adding of the calcium chloride reagent, slowly and with a minimum turbulence; permitting the solution to stand for a predetermined period of time to permit the total clot retraction and the settling of fibrin strands; counting the radioactivity of the retrieved clot for a predetermined period of time; removing the formed clot and any accumulated fibrin strands; washing the clot with copious amounts of additive free saline solution; resuspending the washed clot in additive free saline solution; counting the radioactivity of the residual clot in a saline solution; establishing a background level of the radioactive count of water; and determining the % uptake by utilizing the original solution as a standard and the residual clot as the unknown sample thereby to provide an indication of the clotting time.
Claim 7
Independent Claim
199 words
A method of analyzing blood plasma clotting, comprising the steps of adding platelet-rich plasma to a radionuclide to form a solution; swirling the solution; incubating the swirled solution in a water bath at a predetermined temperature for a predetermined period of time; adding calcium chloride reagent to the swirled solution; gently tilting the solution periodically while it is in the bath; adding Heparin at a predetermined period of time after the adding of the calcium chloride reagent, slowly and with a minimum turbulence; permitting the solution to stand for a predetermined period of time to permit the total clot retraction and the settling of fibrin strands; counting the radioactivity of the retrieved clot for a predetermined period of time; removing the formed clot and any accumulated fibrin strands; washing the clot with copious amounts of additive free saline solution; resuspending the washed clot in additive free saline solution; counting the radioactivity of the residual clot in a saline solution; establishing a background level of the radioactive count of water; and determining the % uptake by utilizing the original solution as a standard and the residual clot as the unknown sample thereby to provide an indication of the clotting time.
Claim 8
Dependent Claim
36 words
A method as claimed in claim 5, wherein 0.3 ml of platelet-rich plasma is added to 0.1 ml of radionuclide and the swirled solution is incubated in a water bath at 37° C for three minutes.
Claim 9
Dependent Claim
37 words
A method as claimed in claim 6, wherein 0.3 ml of calcium chloride is added to the swirled solution, the solution is gently tilted every 15 seconds and 0.3 ml of Heparin is added to the solution.
Claim 10
Dependent Claim
42 words
A method as claimed in claim 7, wherein the solution is permitted to stand for 10 minutes, the radionuclide uptake of the clot is counted for one minute and the additive free saline solution is 0.9% normal saline solution in 1% Heparin.
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) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |