Patent US3940802A successfully refreshed from Google Patents.
US3940802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Medical appliance made of plastic
Assignee: Tanabe Pharma Corp
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Filing: 1975-01-24
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Granted: 1976-03-02
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Expires: 1995-01-24
Abstract
Abstract A medical appliance suitable for use in direct or indirect contact with blood, such as an artificial valve, artificial blood vessel, blood transfusion set, solution infusion set, or blood bag characterized by being composed of 100 parts by weight of polyvinyl chloride and as plasticizer 50 to 100 parts by weight of thermoplastic polyurethane of the polyester type, said polyurethane having a softening point of about 70 DEG C and giving no spot other than that of the origin at the same position loaded the test sample onto the plate in thin-layer chromatogram.
Inventors
- 👤 Eiji Sako
- 👤 Hisasi Sasamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:50
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/14; A61L27/26
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
76 words
A medical appliance suitable for use in direct or indirect contact with human blood, characterized by being fabricated from plasticized polyvinyl chloride comprising 100 parts by weight of polyvinyl chloride and 50 to 100 parts by weight of thermoplastic polyesterbased polyurethane used as plasticizer, said polyurethane having a softening point of about 70°C and giving in a thin-layer chromatogram no spot other than the one at the original position where a test sample has been loaded.
Claim 2
Dependent Claim
76 words
A medical appliance suitable for use in direct or indirect contact with human blood, characterized by being fabricated from plasticized polyvinyl chloride comprising 100 parts by weight of polyvinyl chloride and 50 to 100 parts by weight of thermoplastic polyesterbased polyurethane used as plasticizer, said polyurethane having a softening point of about 70°C and giving in a thin-layer chromatogram no spot other than the one at the original position where a test sample has been loaded.
Claim 3
Dependent Claim
22 words
A blood bag according to claim 1, wherein the amounts of the thermoplastic polyester-based polyurethane are 60 to 90 parts by weight.
Claim 4
Dependent Claim
22 words
An infusion set according to claim 1, wherein the amounts of the thermoplastic polyester-based polyurethane are 60 to 90 parts by weight.
Claim 5
Dependent Claim
22 words
An artificial valve according to claim 1, wherein the amounts of the thermoplastic polyester-based polyurethane are 50 to 70 parts by weight.
Claim 6
Dependent Claim
23 words
An artificial blood vessel according to claim 1, wherein the amounts of the thermoplastic polyesterbased polyurethane are 70 to 100 parts by weight.
Claim 7
Dependent Claim
60 words
A medical appliance according to claim 1, wherein the thermoplastic polyester-based polyurethane is composed of a straight chain polyester component derived from an aliphatic diol having at least 6 carbon atoms and an aliphatic dicarboxylic acid having at least 6 carbon atoms, said polyester having a hydroxyl number of 50 to 60, and an alkylene diisocyanate or polyoxyalkylene diisocyanate component.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |