GB2340430B - Shape memory plastics articles and methods of processing same - Google Patents

Shape memory plastics articles and methods of processing same

Info

Publication number
GB2340430B
GB2340430B GB9812224A GB9812224A GB2340430B GB 2340430 B GB2340430 B GB 2340430B GB 9812224 A GB9812224 A GB 9812224A GB 9812224 A GB9812224 A GB 9812224A GB 2340430 B GB2340430 B GB 2340430B
Authority
GB
United Kingdom
Prior art keywords
sleeve
tube
sliding over
pressure
article
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.)
Expired - Lifetime
Application number
GB9812224A
Other versions
GB2340430A (en
GB9812224D0 (en
Inventor
Jonathan Anthony Lloyd
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.)
Dental Root Filling Products Ltd
Original Assignee
Dental Root Filling Products 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 Dental Root Filling Products Ltd filed Critical Dental Root Filling Products Ltd
Priority to GB9812224A priority Critical patent/GB2340430B/en
Publication of GB9812224D0 publication Critical patent/GB9812224D0/en
Publication of GB2340430A publication Critical patent/GB2340430A/en
Application granted granted Critical
Publication of GB2340430B publication Critical patent/GB2340430B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/06—Making preforms having internal stresses, e.g. plastic memory
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • 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
    • A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
    • A61L31/04—Macromolecular materials
    • A61L31/048—Macromolecular materials obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • 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
    • A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
    • A61L31/14—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/753—Medical equipment; Accessories therefor

Landscapes

  • Health & Medical Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Surgery (AREA)
  • Vascular Medicine (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials For Medical Uses (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Dental Preparations (AREA)

Abstract

An article, for example a dental point, formed of a hydrophilic plastics material is capable of undergoing controlled radial expansion (d<SB>1</SB> to d<SB>2</SB>) upon hydration by aqueous media including body fluids without appreciable axial expansion. The hydrophilic plastics material is pre-stressed by application of pressure to its unhydrated form at a temperature in the range 100 to 160{C. It is then cooled to 40{C or less before release of the applied pressure. After cooling, the material may be machined to shape. Alternatively, pre-stressing can be carried out after shaping. Preferably, the pressure is applied by extruding the material through a die which may be maintained at the same temperature as that of the polymeric material. The article may also be used in engineering to develop gaskets for underwater use or as a tube or sleeve for sealing ruptured pipes; in electrical applications as a sleeve for sliding over electrical connectors; in medicine as a tube for sliding over limbs to immobilise broken bones and in vascular therapy as a tube or sleeve for sliding over arteries or for insertion into blood vessels or other body passages and cavities for opening up constrictions.
GB9812224A 1998-06-05 1998-06-05 Shape memory plastics articles and methods of processing same Expired - Lifetime GB2340430B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9812224A GB2340430B (en) 1998-06-05 1998-06-05 Shape memory plastics articles and methods of processing same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9812224A GB2340430B (en) 1998-06-05 1998-06-05 Shape memory plastics articles and methods of processing same

Publications (3)

Publication Number Publication Date
GB9812224D0 GB9812224D0 (en) 1998-08-05
GB2340430A GB2340430A (en) 2000-02-23
GB2340430B true GB2340430B (en) 2000-09-06

Family

ID=10833328

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9812224A Expired - Lifetime GB2340430B (en) 1998-06-05 1998-06-05 Shape memory plastics articles and methods of processing same

Country Status (1)

Country Link
GB (1) GB2340430B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10021605A1 (en) * 2000-05-04 2001-11-08 Upmeyer Hans Juergen Dental filler, especially useful as root canal filler, contains additive(s) which expand when filler hardens
GB0309317D0 (en) * 2003-04-24 2003-06-04 Dental Root Filling Products L Composition
GB0415981D0 (en) * 2004-07-16 2004-08-18 Dental Root Filling Products L Composition

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1566552A (en) * 1976-09-28 1980-05-08 Highgate D J Swellable polymers
GB2139898A (en) * 1983-05-09 1984-11-21 Donald James Highgate Deformable polymeric compositions

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1566552A (en) * 1976-09-28 1980-05-08 Highgate D J Swellable polymers
GB2139898A (en) * 1983-05-09 1984-11-21 Donald James Highgate Deformable polymeric compositions

Also Published As

Publication number Publication date
GB2340430A (en) 2000-02-23
GB9812224D0 (en) 1998-08-05

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20160605

S28 Restoration of ceased patents (sect. 28/pat. act 1977)

Free format text: APPLICATION FILED

732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)

Free format text: REGISTERED BETWEEN 20171005 AND 20171011

S28 Restoration of ceased patents (sect. 28/pat. act 1977)

Free format text: RESTORATION ALLOWED

Effective date: 20171025

PE20 Patent expired after termination of 20 years

Expiry date: 20180604