Autoclavable, corrugated, respiratory care tubing

• US 4,000,341 A
• Filed: 05/23/1975
• Issued: 12/28/1976
• Est. Priority Date: 05/23/1975
• Status: Expired due to Term

• Current Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Original Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Inventors: Matson, Gale Wendell
• Primary Examiner(s): Dier, Philip
• Application Number:
  US05/580,195
• Time in Patent Office: 585 Days
• Field of Search: 428/36, 428/35, 428/182, 260/878 R, 260/878 B, 260/897 R, 260/876 R, 260/876 B, 138/119, 138/122, 138/129, 138/132, 138/DIG. 7, 138/121, 128/145.5-145.8, 128/185-188, 128/142
• US Class Current: 428/36.9
• CPC Class Codes: A61M 16/0875 Connecting tubes
• CPC Class Codes: A61M 2207/10 Device therefor
• CPC Class Codes: B29C 48/0018 combined with shaping by orienting, stretching or shrinking, e.g. film blowing B29C48/0017 takes precedence
• CPC Class Codes: B29C 48/09 Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
• CPC Class Codes: B29C 48/12 Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
• CPC Class Codes: B29C 48/13 Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
• CPC Class Codes: B29C 49/0005 characterised by the material
• CPC Class Codes: B29L 2023/003 having irregular or rough surfaces
• CPC Class Codes: C08L 23/02 not modified by chemical after-treatment
• CPC Class Codes: C08L 23/12 Polypropene
• CPC Class Codes: C08L 23/16 Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
• CPC Class Codes: C08L 2666/24 Graft or block copolymers according to groups C08L51/00, C08L53/00 or C08L55/02; Derivatives thereof
• CPC Class Codes: C08L 53/02 of vinyl-aromatic monomers and conjugated dienes
• CPC Class Codes: F16L 11/111 with homogeneous wall
• CPC Class Codes: Y10S 128/911 Unilimb inhalation-exhalation breathing tubes
• CPC Class Codes: Y10T 428/139 Open-ended, self-supporting conduit, cylinder, or tube-type article
• CPC Class Codes: Y10T 428/24694 Parallel corrugations

Abstract

Autoclavable, corrugated, respiratory care tubing comprising thermoplastic material which is aliphatic olefin polymer, aromatic olefin block polymer or mixtures thereof, the material being hydrolytically stable, having a flexular modulus according to A.S.T.M. D-790 of less than 1800 kg/cm², having a Shore A hardness according to A.S.T.M. D-2240 of from 45 to 92 and being substantially dimensionally stable in steam at temperatures of at least about 120° C.

Claims

1. Autoclavable corrugated, respiratory care tubing comprising thermoplastic material selected from the class consisting of aliphatic olefin polymer, aromatic olefin block polymer and mixtures thereof, said material being hydrolytically stable, having a flexular modulus according to A.S.T.M. D-790 of less than 1800 kg/cm², having a Shore A hardness according to A.S.T.M. D-2240 of from 45 to 92 and being substantially dimensionally stable in steam at temperatures of at least about 120°

C.

2. The tubing of claim 1 wherein the thermoplastic material is substantially dimensionally stable in steam at temperatures of at least about 135°

C.

3. The tubing of claim 2 wherein said thermoplastic material comprises polypropylene and ethylene-propylene polymer.

4. The tubing of claim 3 wherein said polypropylene is isotactic.

5. The tubing of claim 4 wherein said thermoplastic material includes another polyolefin.

6. The tubing of claim 5 wherein said other polyolefin comprises nonisotactic polypropylene.

7. The tubing of claim 2 wherein said thermoplastic material comprises hydrogenated aromatic olefin block polymer.

8. The tubing of claim 7 wherein said thermoplastic material comprises a mixture of aliphatic olefin polymer and hydrogenated styrene/isoprene/styrene block polymer.

9. The tubing of claim 8 wherein said aliphatic olefin polymer comprises polypropylene.

10. The tubing of claim 8 wherein said aliphatic olefin polymer comprises polypropylene and ethylene-propylene polymer.