EP0154423A1 - Wrapped radio opaque yarn - Google Patents

Wrapped radio opaque yarn Download PDF

Info

Publication number
EP0154423A1
EP0154423A1 EP85300891A EP85300891A EP0154423A1 EP 0154423 A1 EP0154423 A1 EP 0154423A1 EP 85300891 A EP85300891 A EP 85300891A EP 85300891 A EP85300891 A EP 85300891A EP 0154423 A1 EP0154423 A1 EP 0154423A1
Authority
EP
European Patent Office
Prior art keywords
yarn
radio opaque
fibre
opaque yarn
filled
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP85300891A
Other languages
German (de)
French (fr)
Other versions
EP0154423B1 (en
Inventor
Edmund Hugh Carus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vernon Carus Ltd
Original Assignee
Vernon Carus Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vernon Carus Ltd filed Critical Vernon Carus Ltd
Priority to AT85300891T priority Critical patent/ATE33997T1/en
Publication of EP0154423A1 publication Critical patent/EP0154423A1/en
Application granted granted Critical
Publication of EP0154423B1 publication Critical patent/EP0154423B1/en
Expired legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/44—Yarns or threads characterised by the purpose for which they are designed
    • D02G3/441—Yarns or threads with antistatic, conductive or radiation-shielding properties

Definitions

  • This invention relates to radio opaque yarn such as that used in the manufacture of surgical swabs and dressings.
  • Radio opaque fibres are disclosed in our European patent application No. 83304777.2. These fibres contain a high proportion of barium sulphate in order to provide the required degree of X-ray opacity. Such highly filled fibres tend to stretch due to fracture of the constituent filaments. Moreover the fractured filaments tend to run causing aggregations which may snarl-up during weaving.
  • a radio opaque yarn comprises a bundle of filled fibres containing not less than 54% w /w of barium sulphate, the bundle being bound with up to 20% w /w of substantially unfilled binding fibre.
  • Conventional wrapped yarns contain approximately 50% by weight of binding fibre.
  • the present invention employs a higher proportion of filled fibres. This is important in the production of radio opaque yarns to optimise the opacity of the product.
  • the unfilled, binding fibre may have a higher modulus and tensile strength than the filled fibres, increasing the strength and durability of the yarn. Furthermore the binding prevents running of any fractured filled fibres. This particularly facilitates narrow weaving or knitting where control of yarn tension is important.
  • the binding fibres may be monofilament or multifilament.
  • Preferred yarns in accordance with this invention comprise less than 5% w /w of binding fibre.
  • the binding fibre preferably has a diameter of about 0.05 of the diameter of the bundle of filled fibre.
  • the binding fibre may be wound at a preferred rate of 2 to 8 turns per cm, more preferably 4 to 6 turns per cm, most preferably 4 turns per cm. Yarn having less than 2 turns per cm of wrapping fibre tend to fragment during weaving, whereas yarn having more than 8 turns per cm is brittle and liable to break during cloth processing.
  • the binding fibre preferably comprises a polyester although alternative materials which form fibres having a high modulus and tensile strength may be employed.
  • the filled fibre preferably comprises polypropylene. Polyester fibres have also been found to be applicable. A maximum of 80% w /w of barium sulphate has been found to be appropriate although a maximum of 70% w /w may be preferred.
  • a coupling agent may be employed, for example an alkanoyl triisostearoyl titanate or other of the coupling agents disclosed in European patent application No. 83304777.2.
  • binding fibres may be employed although use of a single fibre is preferred because wrapping with a plurality of fibres has not been found to confer any additional advantages.
  • the binding fibre may be textured, bulked, crimped or otherwise treated both to impart extensibility to the yarn and to improve the ability of the yarn to withstand wet and dry fabric finishing operations.
  • a bundle of twenty filamens composed of polypropylene (melt flow index 12, 29.5% w /w), barium sulphate (particle size 0.5 ⁇ m, 70% w /w) and a coupling agent isopropyl triisostearoyl titanate (0.5% w /w) and a pigment (Cobalt Blue Med) having a weight of not less than 3000 decitex was wrapped with 4 turns per cm of a flat polyester fibre (24 filament, 74 decitex, no added lubricant).
  • the resultant yarn contained 68% w /w of barium sulphate and satisfied both the British Pharmacopea Index test (reference SDM XVII) and the U.S. pharmaceutical X-ray opacity requirements.
  • the yarn was found to have a minimum breaking load greater than 500 cN and a breaking extension not less than 100% but not greater than 300%. The yarn could be woven without difficulty.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Artificial Filaments (AREA)
  • Woven Fabrics (AREA)

Abstract

A radio opaque yarn comprises a bundle of filled polypropylene fibres containing 54% to 80% <w>/w of barium sulphate, the bundle being bound with up to 20% <w>/w of substantially unfilled polyester fibres.

Description

  • This invention relates to radio opaque yarn such as that used in the manufacture of surgical swabs and dressings.
  • Radio opaque fibres are disclosed in our European patent application No. 83304777.2. These fibres contain a high proportion of barium sulphate in order to provide the required degree of X-ray opacity. Such highly filled fibres tend to stretch due to fracture of the constituent filaments. Moreover the fractured filaments tend to run causing aggregations which may snarl-up during weaving.
  • According to the present invention a radio opaque yarn comprises a bundle of filled fibres containing not less than 54% w/w of barium sulphate, the bundle being bound with up to 20% w/w of substantially unfilled binding fibre.
  • Conventional wrapped yarns contain approximately 50% by weight of binding fibre. The present invention employs a higher proportion of filled fibres. This is important in the production of radio opaque yarns to optimise the opacity of the product. The unfilled, binding fibre may have a higher modulus and tensile strength than the filled fibres, increasing the strength and durability of the yarn. Furthermore the binding prevents running of any fractured filled fibres. This particularly facilitates narrow weaving or knitting where control of yarn tension is important. The binding fibres may be monofilament or multifilament.
  • Preferred yarns in accordance with this invention comprise less than 5% w/w of binding fibre.
  • The binding fibre preferably has a diameter of about 0.05 of the diameter of the bundle of filled fibre.
  • The binding fibre may be wound at a preferred rate of 2 to 8 turns per cm, more preferably 4 to 6 turns per cm, most preferably 4 turns per cm. Yarn having less than 2 turns per cm of wrapping fibre tend to fragment during weaving, whereas yarn having more than 8 turns per cm is brittle and liable to break during cloth processing.
  • The binding fibre preferably comprises a polyester although alternative materials which form fibres having a high modulus and tensile strength may be employed.
  • The filled fibre preferably comprises polypropylene. Polyester fibres have also been found to be applicable. A maximum of 80% w/w of barium sulphate has been found to be appropriate although a maximum of 70% w/w may be preferred. A coupling agent may be employed, for example an alkanoyl triisostearoyl titanate or other of the coupling agents disclosed in European patent application No. 83304777.2.
  • One to five binding fibres may be employed although use of a single fibre is preferred because wrapping with a plurality of fibres has not been found to confer any additional advantages. The binding fibre may be textured, bulked, crimped or otherwise treated both to impart extensibility to the yarn and to improve the ability of the yarn to withstand wet and dry fabric finishing operations.
  • The invention is further described by means of examples and not in any limitative sense.
  • A bundle of twenty filamens composed of polypropylene (melt flow index = 12, 29.5% w/w), barium sulphate (particle size 0.5µm, 70% w/w) and a coupling agent isopropyl triisostearoyl titanate (0.5% w/w) and a pigment (Cobalt Blue Med) having a weight of not less than 3000 decitex was wrapped with 4 turns per cm of a flat polyester fibre (24 filament, 74 decitex, no added lubricant). The resultant yarn contained 68% w/w of barium sulphate and satisfied both the British Pharmacopea Index test (reference SDM XVII) and the U.S. pharmaceutical X-ray opacity requirements. The yarn was found to have a minimum breaking load greater than 500 cN and a breaking extension not less than 100% but not greater than 300%. The yarn could be woven without difficulty.

Claims (10)

1. A radio Opaque yarn comprising a bundle of filled fibres containing not less than 54% w/w of barium sulphate,
characterised in that
the bundle being bound with up to 20% w/w of substantially unfilled fibre.
2. A radio opaque yarn as claimed in claim 1, characterised in that
the binding fibre comprises less than 5% w/w of the yarn.
3. A radio opaque yarn as claimed in any preceding claim characterised in that
the diameter of the binding fibre is 0.05 of the diameter of the bundle of filled fibres.
4. A radio opaque yarn as claimed in any preceding claim, characterised in that
the yarn comprises 2 to 8 turns per cm of binding fibre.
5. A radio opaque yarn as claimed in claim 4, characterised in that
the yarn comprises 4 to 6 turns per cm of binding fibre.
6. A radio opaque yarn as claimed in any preceding claim, characterised in that
the binding fibre comprises polyester.
7. A radio opaque yarn as claimed in any preceding claim characterised in that
the filled fibre comprises polypropylene or polyester.
8. A radio opaque yarn as claimed in claim 8, characterised in that
the filled fibre comprises 54% to 80% w/w of barium sulphate.
9. A radio opaque yarn as claimed in claim 8 characterised in that
the filled fibre comprises 54% to 70%w/w of barium sulphate.
10. A radio opaque yarn as claimed in any of claims 7 to 9
characterised in that
the yarn includes an alkanoyl triisostearoyl titanate coupling agent.
EP85300891A 1984-02-11 1985-02-11 Wrapped radio opaque yarn Expired EP0154423B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85300891T ATE33997T1 (en) 1984-02-11 1985-02-11 ROENTGENOSCOPIC CONTRASTING WRAPPING THREAD.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8403656 1984-02-11
GB848403656A GB8403656D0 (en) 1984-02-11 1984-02-11 Yarns

Publications (2)

Publication Number Publication Date
EP0154423A1 true EP0154423A1 (en) 1985-09-11
EP0154423B1 EP0154423B1 (en) 1988-05-04

Family

ID=10556475

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85300891A Expired EP0154423B1 (en) 1984-02-11 1985-02-11 Wrapped radio opaque yarn

Country Status (5)

Country Link
EP (1) EP0154423B1 (en)
AT (1) ATE33997T1 (en)
CA (1) CA1262815C (en)
DE (1) DE3562494D1 (en)
GB (2) GB8403656D0 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0304311A1 (en) * 1987-08-21 1989-02-22 The Wellcome Foundation Limited Complex of polyethylene glycol and tissue plasminogen activator

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8716243D0 (en) * 1987-07-10 1987-08-19 Courtaulds Plc Yarns
US6169045B1 (en) 1993-11-16 2001-01-02 Kimberly-Clark Worldwide, Inc. Nonwoven filter media
CN103741304A (en) * 2013-07-09 2014-04-23 浙江川本卫生材料有限公司 Medical X-ray detectable sewing thread

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1188629A (en) * 1957-11-22 1959-09-24 Vernon & Company Ltd Improvements made to surgical threads and dressings detectable by chi rays.
GB839718A (en) * 1957-11-19 1960-06-29 Robinson & Sons Ltd Improvements in surgical dressings
FR2125527A1 (en) * 1971-02-17 1972-09-29 Codman & Shurtleff

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB839718A (en) * 1957-11-19 1960-06-29 Robinson & Sons Ltd Improvements in surgical dressings
FR1188629A (en) * 1957-11-22 1959-09-24 Vernon & Company Ltd Improvements made to surgical threads and dressings detectable by chi rays.
FR2125527A1 (en) * 1971-02-17 1972-09-29 Codman & Shurtleff

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0304311A1 (en) * 1987-08-21 1989-02-22 The Wellcome Foundation Limited Complex of polyethylene glycol and tissue plasminogen activator

Also Published As

Publication number Publication date
GB2153867B (en) 1986-12-03
GB2153867A (en) 1985-08-29
CA1262815A (en) 1989-11-14
DE3562494D1 (en) 1988-06-09
GB8403656D0 (en) 1984-03-14
GB8430257D0 (en) 1985-01-09
EP0154423B1 (en) 1988-05-04
ATE33997T1 (en) 1988-05-15
CA1262815C (en) 1989-11-14

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