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US 11,998,663 B2Granted
Polytetrafluoroethylene tube and medical tube using same
AssigneeJunkosha Inc.
InventorsMasamichi Takahashi, Ayumi Matsuda, Koichiro Yoshioka
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AssigneeJunkosha Inc.
InventorsMasamichi Takahashi, Ayumi Matsuda, Koichiro Yoshioka
Estimating the term…
The present invention provides a thin-walled PTFE tube with appropriate elongation, sufficient strength, and good uniformity during stretching and a medical tube with excellent flexibility and dimensional accuracy. The polytetrafluoroethylene tube according to the present invention is a polytetrafluoroethylene tube having a wall thickness of about 0.04 mm or less, wherein the wetting tension of either of or both outer and inner surfaces of the polytetrafluoroethylene tube is 46 mN/m or more, and in a stress-strain curve obtained by a tensile test performed under an atmosphere of 200° C., tensile stress at 20% strain σ20 (N/mm2) of the polytetrafluoroethylene tube and tensile stress at 50% strain σ50 (N/mm2) of the polytetrafluoroethylene tube satisfy 2.0≤0.1×σ20+0.3×σ50<5.5 (Inequality (1)).
A polytetrafluoroethylene tube having a wall thickness of about 0.04 mm or less, wherein a wetting tension of either of or both outer and inner surfaces of the polytetrafluoroethylene tube is 46 mN/m or more, and wherein in a stress-strain curve obtained by a tensile test performed under an atmosphere of 200° C., tensile stress at 20% strain σ20 (N/mm2) of the polytetrafluoroethylene tube and tensile stress at 50% strain σ50 (N/mm2) of the polytetrafluoroethylene tube satisfy Expression (1):
A polytetrafluoroethylene tube having a wall thickness of about 0.04 mm or less, wherein an inner diameter of the polytetrafluoroethylene tube is about 3.0 mm or less, and wherein in a stress-strain curve obtained by a tensile test performed under an atmosphere of 200° C., tensile stress at 20% strain σ20 (N/mm2) of the polytetrafluoroethylene tube and tensile stress at 50% strain σ50 (N/mm2) of the polytetrafluoroethylene tube satisfy Inequality (1):
A medical tube comprising a polytetrafluoroethylene liner prepared by processing a polytetrafluoroethylene tube, the polytetrafluoroethylene liner having a wall thickness of about 0.04 mm or less, wherein an inner diameter of the polytetrafluoroethylene liner is about 3.0 mm or less, and wherein in a stress-strain curve obtained by a tensile test performed under an atmosphere of 200° C., tensile stress at 20% strain σ′20 (N/mm2) of the polytetrafluoroethylene liner and tensile stress at 50% strain σ′50 (N/mm2) of the polytetrafluoroethylene liner satisfy Inequality (2):
Dependencies are inferred from the claim text.