US4435507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and device for preparation of cell samples for cytological tests
Assignee: Individual
•
Filing: 1981-06-30
•
Granted: 1984-03-06
•
Expires: 2001-06-30
Abstract
Abstract Process for preparing cell samples for cytological tests of exfoliated cells, in which the cell sample is in the form of a slurry in a physiological solution, which is introduced into a first chamber (5) provided with a wall (2) with a large number of holes with a cross section of 10-100 μm and communicating with a second chamber (6). The solution is pressed under the influence of a pressure differential between the first (5) and the second (6) chamber through the wall (2) with holes. The material for the cell sample is taken from the solution in the second chamber (6) for smearing on a slide. A suitable device for carrying out the process is also described.
Inventors
- 👤 Bjorn G. Stenkvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:03
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/28; G01N1/40; G01N1/4077; G01N1/2813; Y; Y10; Y10T; Y10T436/00; Y10T436/10; Y10T436/25; Y10T436/25375
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
111 words
Process for preparation of cell samples for cytological tests of exfoliated cells, in which the cell sample is in the form of a slurry in solution, characterized in that the slurry is introduced into a first chamber provided with a wall with a large number of holes with a cross section of 10-100 μm and in communication with a second chamber, and that said solution under the influence of a pressure differential between the first and the second chambers is made to pass through the wall provided with holes one or more times, and that the material from the second chamber is used for the preparation of smears on a slide.
Claim 2
Dependent Claim
111 words
Process for preparation of cell samples for cytological tests of exfoliated cells, in which the cell sample is in the form of a slurry in solution, characterized in that the slurry is introduced into a first chamber provided with a wall with a large number of holes with a cross section of 10-100 μm and in communication with a second chamber, and that said solution under the influence of a pressure differential between the first and the second chambers is made to pass through the wall provided with holes one or more times, and that the material from the second chamber is used for the preparation of smears on a slide.
Claim 3
Dependent Claim
17 words
Process according to claim 1, characterized in that the cross section of the holes is 10-40 μm.
Claim 4
Dependent Claim
26 words
Process according to claim 1, characterized in that a pressure differential of 50-1000 kPa is used to press the slurry through the wall provided with holes.
Claim 5
Dependent Claim
27 words
Process according to claim 1, characterized in that the liquid is allowed to sediment in the second chamber and that smears are made from the sediment material.
Claim 6
Dependent Claim
30 words
Process according to claim 1, characterized in that the pressure differential is established by pressing a plunger into a cylindrical cavity, said cavity being in communication with the first chamber.
Claim 7
Dependent Claim
19 words
Process according to claim 1, characterized in that the slurry contains a cell dissociating agent and a fixing agent.
Claim 8
Dependent Claim
37 words
Process according to claim 6, characterized in that the cell dissociating agent consists of hyaluronidase, chymotrypsin or 1,4-mercapto-2,3-butane diol and the fixing agent of 50-95% ethanol and that the slurry contains a small amount of sodium hydroxide.
Claim 9
Dependent Claim
23 words
Process according to claim 1, characterized in that the slurry is made to pass through the wall by alternating pressure and suction effect.
References Cited (Backward Citations)
DE1034462B
Cited
DE1084886B
Cited
US3206128A
Cited
DE1617894C
Cited
US3779371A
Cited
SE401107B
Cited
US3870639A
Cited
DE2627416A1
Cited
DE2703326A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |