US4081356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fecalator, an apparatus and method for concentration of parasite eggs and larvae
Assignee: United States Department of Health and Human Services
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Filing: 1976-09-24
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Granted: 1978-03-28
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Expires: 1996-09-24
Abstract
Abstract A device and method for the concentration of parasite eggs and larvae consisting of separable upper and lower chambers connected by a mid-piece which incorporates a filter of stainless steel gauze. The sample is emulsified in the upper chamber and is filtered into the lower chamber. Ether is added through the upper chamber and the mid-piece and upper chamber are removed. The lower chamber is shaken and centrifuged, the mid-plug of debris is removed, and the tube is drained and swabbed clean leaving a small sediment containing the parasite eggs and larvae. The sediment is removed by extraction with Lugol's iodine or saline to dilute the sediment.
Inventors
- 👤 Willadene S. Zierdt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:27
CPC Classifications
A; A61; A61B; A61B10/00; A61B10/0038
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
138 words
A method of recovering parasitic eggs and larvae from a measured sample of feces which comprises: (a) softening and homogenizing said sample in a tube having an open end utilizing formaldehyde adding an oil-in-water surfactant with mechanical stirring agitation; (b) closing said open end with a filter means and a separation chamber; (c) agitating in a horizontal direction in said tube; (d) inverting and shaking said tube vertically to filter said sample through said filter into said separation chamber and adding ether to complete the filtration to produce a formalin-ether mixture with said sample; (e) reagitating the formalin-ether mixture and said sample; and (f) centifuging said mixture and sample to produce three layers, namely, (1) top layer containing ether, (2) intermediate layer containing fecal solids, and (3) bottom layer containing clear fluid and packed sediment with said eggs.
Claim 2
Independent Claim
138 words
A method of recovering parasitic eggs and larvae from a measured sample of feces which comprises: (a) softening and homogenizing said sample in a tube having an open end utilizing formaldehyde adding an oil-in-water surfactant with mechanical stirring agitation; (b) closing said open end with a filter means and a separation chamber; (c) agitating in a horizontal direction in said tube; (d) inverting and shaking said tube vertically to filter said sample through said filter into said separation chamber and adding ether to complete the filtration to produce a formalin-ether mixture with said sample; (e) reagitating the formalin-ether mixture and said sample; and (f) centifuging said mixture and sample to produce three layers, namely, (1) top layer containing ether, (2) intermediate layer containing fecal solids, and (3) bottom layer containing clear fluid and packed sediment with said eggs.
Claim 3
Dependent Claim
15 words
The method according to claim 1 wherein said surfactant comprises 20% Triton X-100 in water.
Claim 4
Independent Claim
119 words
An apparatus for recovering parasitic eggs and larvae from a fecal sample comprising: (a) cup for measuring a predetermined quantity of fecus; (b) an open ended tube adapted to sealingly receive said cup in one end thereof to form an emulsification chamber therewith; (c) filter means adapted to cover the other end of said tube to filter the contents, said filter means therefore further including a coaxial tube to provide for passage of gas driving filtration; (d) a tube forming a separating chamber adapted to fit over the open end of said emulsification chamber to receive the filtered contents thereof; and (e) annular collar means to releasably connect said emulsification and separating chambers to form a closed container therewith.
Claim 5
Independent Claim
119 words
An apparatus for recovering parasitic eggs and larvae from a fecal sample comprising: (a) cup for measuring a predetermined quantity of fecus; (b) an open ended tube adapted to sealingly receive said cup in one end thereof to form an emulsification chamber therewith; (c) filter means adapted to cover the other end of said tube to filter the contents, said filter means therefore further including a coaxial tube to provide for passage of gas driving filtration; (d) a tube forming a separating chamber adapted to fit over the open end of said emulsification chamber to receive the filtered contents thereof; and (e) annular collar means to releasably connect said emulsification and separating chambers to form a closed container therewith.
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) | 1981-03-27 | 1981-09-26 | 1982-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-27 | 1985-09-26 | 1986-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-27 | 1989-09-26 | 1990-03-28 | $7700.00 | Window Closed / Lapsed |