# US 11,998,663 B2 · Polytetrafluoroethylene tube and medical tube using same

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- Number: US 11,998,663 B2
- Document ID: US11998663B2
- Status: Granted
- Kind: B2
- Application number: 18/222,174
- Filed: 2023-07-14
- Published: 2023-11-23
- Granted: 2024-06-04
- Earliest claimed: 2022-05-17
- Assignees: Junkosha Inc.
- Applicants: Junkosha Inc.
- Inventors: Masamichi Takahashi; Ayumi Matsuda; Koichiro Yoshioka
- Web page: https://patentgrep.com/patent/US11998663B2

## CPC

- A61L 29/06: obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- A61L 29/04: Macromolecular materials
- A61L 29/041: {obtained by reactions only involving carbon-to-carbon unsaturated bonds}
- A61L 29/14: Materials characterised by their function or physical properties {, e.g. lubricating compositions}
- A61M 25/00: Catheters; Hollow probes (dilators A61M29/00; {peritoneal catheters A61M1/285; tracheal tubes A61M16/04; for drainage A61M27/00; for uterus, vagina or rectum A61M31/00} ; for measuring or testing A61B; {materials for catheters A61L29/00})
- A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K)
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}

## Abstract

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)).

## Claims

### Claim 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):
2.0≤0.1×σ20+0.3×σ50<5.5. Expression (1)

### Claim 2 (depends on 1)

The polytetrafluoroethylene tube according to claim 1, wherein the polytetrafluoroethylene tube has a tensile strain at break of 200% or more in the tensile test performed under an atmosphere of 200° C.

### Claim 3 (depends on 1)

The polytetrafluoroethylene tube according to claim 1, wherein the tensile stress at 20% strain σ20 of the polytetrafluoroethylene tube in the tensile test performed under an atmosphere of 200° C. is 4.0 N/mm2 or more.

### Claim 4 (depends on 1)

A medical tube using the polytetrafluoroethylene tube according to claim 1.

### Claim 5

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): 2.0<0.1×σ20+0.3×σ50<5.5.

### Claim 6 (depends on 5)

The polytetrafluoroethylene tube according to claim 5, wherein the polytetrafluoroethylene tube has a tensile strain at break of 200% or more in the tensile test performed under an atmosphere of 200° C.

### Claim 7 (depends on 5)

The polytetrafluoroethylene tube according to claim 5, wherein the tensile stress at 20% strain σ20 of the polytetrafluoroethylene tube in the tensile test performed under an atmosphere of 200° C. is 4.0 N/mm2 or more.

### Claim 8 (depends on 5)

A medical tube using the polytetrafluoroethylene tube according to claim 5.

### Claim 9

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): 2.4<0.1×σ′20+0.3×σ′50<6.6.