US3898982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capillary tube for blood examination
Assignee: Jintan Terumo Co Ltd
•
Filing: 1973-09-27
•
Granted: 1975-08-12
•
Expires: 1993-09-27
Abstract
Abstract Capillary tubes of the double open-ended type used for blood collection and examination are provided over a portion of their internal surfaces with a dry coating of a reagent, e.g., a colorant for staining blood cells, a phagocytic substance for examining phagocytosis of leucocyte, etc. The blood introduction end of the tube is left uncoated to promote capillary action in blood sampling. The coating may include an anti-coagulant and several different reagents may be mixed in the coating or coated at intervals longitudinally of the tube.
Inventors
- 👤 Itsurou Katsuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:33
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/56; B01L3/561; A; A61; A61B; A61B5/00; A61B5/15; A61B5/150007; A61B5/150015; A61B5/150022; A61B5/150343; A61B5/150755
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
80 words
A tube for blood examination which comprises a double openended capillary tube having an inner diameter which allows the introduction of blood by capillary action through the inlet end of the tube, at least one reagent coating layer coated on a portion of the inner wall surface thereof and spaced apart from said inlet end, and an uncoated inner wall area for the introduction of blood, which runs from said inlet end to an edge of the reagent coating layer.
Claim 2
Dependent Claim
80 words
A tube for blood examination which comprises a double openended capillary tube having an inner diameter which allows the introduction of blood by capillary action through the inlet end of the tube, at least one reagent coating layer coated on a portion of the inner wall surface thereof and spaced apart from said inlet end, and an uncoated inner wall area for the introduction of blood, which runs from said inlet end to an edge of the reagent coating layer.
Claim 3
Dependent Claim
20 words
The tube of claim 1 wherein the length of said uncoated area is about l/3 the length of the tube.
Claim 4
Dependent Claim
22 words
The tube for blood examination according to claim 1 in which said reagent consists essentially of colorant for staining cells in blood.
Claim 5
Dependent Claim
25 words
The tube for blood examination according to claim 1 in which said reagent consists essentially of phagocytic foreign substance for examining the phagocytosis of leucocyte.
Claim 6
Dependent Claim
17 words
The tube for blood examination according to claim 3 in which said reagent coating includes an anticoagulant.
Claim 7
Dependent Claim
33 words
The tube for blood examination according to claim 1 in which said reagent coating layer comprises at least two kinds of reagent and each reagent is coated at intervals longitudinally of the tube.
Claim 8
Dependent Claim
24 words
The tube for blood examination according to claim 5 in which one kind of said reagent is culture medium and the other staining material.
Claim 9
Dependent Claim
103 words
A blood examining method comprising the steps of drawing by capillary action a prescribed amount of fluid containing blood cells, from one end portion of a double open ended capillary tube where no reagent is coated to an extent corresponding to the prescribed amount of the fluid to be introduced, into said capillary tube having a portion where at least one blood examination reagent-containing layer iS coated on the inner wall surface thereof, shaking the capillary tube to permit the reagent to be dissolved into the fluid, and blowing the fluid from the tube onto a substrate whereby an examination sample is prepared.
Claim 10
Dependent Claim
103 words
A blood examining method comprising the steps of drawing by capillary action a prescribed amount of fluid containing blood cells, from one end portion of a double open ended capillary tube where no reagent is coated to an extent corresponding to the prescribed amount of the fluid to be introduced, into said capillary tube having a portion where at least one blood examination reagent-containing layer iS coated on the inner wall surface thereof, shaking the capillary tube to permit the reagent to be dissolved into the fluid, and blowing the fluid from the tube onto a substrate whereby an examination sample is prepared.
Claim 11
Dependent Claim
58 words
The method of claim 8 wherein said layer coating portion of said inner wall surface consists of two separate parts, one part being a culture medium and the other part being a staining material, and said shaking step comprises first mixing the fluid with the culture medium and then mixing the fluid-culture medium mixture with the staining material.
References Cited (Backward Citations)
US2487077A
Cited
US2940448A
Cited
US3146163A
Cited
US3518804A
Cited
US3579303A
Cited
US3620676A
Cited
US3732079A
Cited
US3768978A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |