US4130642A
Expired / Lapsed
US
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Method of separating blood cells components
Assignee: Terumo Corp
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Filing: 1977-10-28
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Granted: 1978-12-19
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Expires: 1997-10-28
Abstract
Abstract A method of separating blood cell components, characterized in that a blood cells suspension containing red cells and at least one of leucocytes and blood platelets is passed through a processing column packed with an Egyptian cotton which has been de-fatted and bleached, thereby allowing the blood cells components other than the red cells to be adsorbed substantially completely on the Egyptian cotton and permitting the red cells portion alone to be isolated.
Inventors
- 👤 Kiyomi Kikugawa
- 👤 Kyoko Minoshima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:39
CPC Classifications
B; B01; B01D; B01D15/00; A; A61; A61M; A61M1/00; A61M1/02; A61M1/0209; A61M1/0218; A61M1/0231; A61M2202/00; A61M2202/04; A61M2202/0413; A61M2202/0429; A61M2202/0439
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
65 words
A method of separating blood cells components, comprising the step of passing blood cells suspension containing red cells and at least one of leukocytes or blood platelets through a column packed with a de-fatted and bleached Egyptian cotton so as to allow the blood cells components other than red cells to be adsorbed on the Egyptian cotton and to isolate the red cells portion alone.
Claim 2
Independent Claim
65 words
A method of separating blood cells components, comprising the step of passing blood cells suspension containing red cells and at least one of leukocytes or blood platelets through a column packed with a de-fatted and bleached Egyptian cotton so as to allow the blood cells components other than red cells to be adsorbed on the Egyptian cotton and to isolate the red cells portion alone.
Claim 3
Dependent Claim
37 words
The method according to claim 1, wherein the Egyptian cotton has a fiber length of at least 26mm, an average fiber thickness of 13 to 19μ and the number of twistings per cm of 70 to 112.
Claim 4
Dependent Claim
28 words
The method according to claim 2, wherein the Egyptian cotton has an average fiber length of at least 35mm and an average fiber thickness of 13 to 16μ.
Claim 5
Dependent Claim
24 words
The method according to claim 1, wherein the Egyptian cotton is packed in the column at a bulk specific gravity of 0.1 to 0.4.
Claim 6
Dependent Claim
32 words
The method according to claim 1, wherein the Egyptian cotton is packed in the column at the rate of 5 to 20g per 200ml of the blood cells suspension to be processed.
Claim 7
Dependent Claim
25 words
The method according to claim 1, wherein the blood cells suspension brought into contact with the Egyptian cotton is maintained at 4° to 37° C.
Claim 8
Dependent Claim
18 words
The method according to claim 6, wherein the blood cells suspension is maintained at 4° to 10° C.
Claim 9
Dependent Claim
30 words
The method according to claim 1, wherein the blood cells suspension is selected from the group consisting of the whole blood subjected to an anticoagulation treatment and packed red cells.
Claim 10
Dependent Claim
37 words
The method according to claim 8, wherein physiological saline solution is added to the packed red cells to adjust the haematocrit value at 40 to 60 and, then, the packed red cells are passed through the column.
Claim 11
Dependent Claim
28 words
The method according to claim 1, wherein a gauge pressure of about 0.2kg/cm 2 is applied to the blood cells suspension for passing the suspension through the column.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-18 | 1982-06-19 | 1982-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-18 | 1986-06-19 | 1986-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-18 | 1990-06-19 | 1990-12-19 | $7700.00 | Window Closed / Lapsed |