Patent US4340615A successfully refreshed from Google Patents.
US4340615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for analysis of absorbed gases
Assignee: Edwards High Vacuum International Ltd
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Filing: 1980-06-03
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Granted: 1982-07-20
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Expires: 2000-06-03
Abstract
Abstract A device in the form of a flexible intravascular probe for use in analyzing absorbed blood gases includes a gas-permeable membrane 10 comprising two layers in intimate contact and supporting each other. The permeability of the second layer 6 is significantly less than that of the first 5, and provides the desired permeability of the membrane 10 as a whole. The first layer 5 provides the desired mechanical compatibility and other properties of the membrane 10.
Inventors
- 👤 Brian Goodwin
- 👤 Peter Middleton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:25
CPC Classifications
B; B01; B01D; B01D63/00; B01D63/06; B01D63/068; A; A61; A61B; A61B5/00; A61B5/145; B01D19/00; B01D19/0031; B01D63/061; B01D67/00; B01D67/0081; B01D67/0088; G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/40
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
91 words
A method of manufacturing a device for use in the analysis of absorbed gases in liquids, comprising the steps of taking a flexible plastics material tube with an aperture in its wall; sheathing the exterior surface of at least that portion of the tube which includes said aperture with a layer of bio-compatible gas-permeable material; and coating the interior surface of that area of said sheathing layer which overlies said aperture with a thin layer of gas-permeable material, the permeability of which is significantly less than that of the sheathing layer.
Claim 2
Independent Claim
91 words
A method of manufacturing a device for use in the analysis of absorbed gases in liquids, comprising the steps of taking a flexible plastics material tube with an aperture in its wall; sheathing the exterior surface of at least that portion of the tube which includes said aperture with a layer of bio-compatible gas-permeable material; and coating the interior surface of that area of said sheathing layer which overlies said aperture with a thin layer of gas-permeable material, the permeability of which is significantly less than that of the sheathing layer.
Claim 3
Dependent Claim
23 words
A method as claimed in claim 1, in which the entire interior surface of the tube receives the coating of low permeability material.
Claim 4
Dependent Claim
19 words
A method as claimed in claim 1 or 2, in which the coating material is polyvinylidene chloride propolymer (PVDC).
Claim 5
Dependent Claim
18 words
A method as claimed in claim 1 or 2, in which the coating material is crystalling polytrifluorochloro-ethylene (kel-F).
References Cited (Backward Citations)
US3717525A
Cited
US3658053A
Cited
US3969548A
Cited
GB2003050A
Cited
US4230463A
Cited
US4243701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-19 | 1986-01-18 | 1986-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-19 | 1990-01-18 | 1990-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-19 | 1994-01-18 | 1994-07-20 | $7700.00 | Window Closed / Lapsed |