WO1999065433A1 - Bande platree orthopedique et son procede d'obtention - Google Patents

Bande platree orthopedique et son procede d'obtention Download PDF

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Publication number
WO1999065433A1
WO1999065433A1 PCT/KR1999/000324 KR9900324W WO9965433A1 WO 1999065433 A1 WO1999065433 A1 WO 1999065433A1 KR 9900324 W KR9900324 W KR 9900324W WO 9965433 A1 WO9965433 A1 WO 9965433A1
Authority
WO
WIPO (PCT)
Prior art keywords
casting tape
substrate
fiber
resin
polyester
Prior art date
Application number
PCT/KR1999/000324
Other languages
English (en)
Inventor
Tae Hun Kim
Yil Woong Yi
Myoung Seok Koh
Chul Min Pai
Original Assignee
Samyang Corporation
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 Samyang Corporation filed Critical Samyang Corporation
Priority to JP2000554314A priority Critical patent/JP2002518094A/ja
Priority to AU43986/99A priority patent/AU4398699A/en
Priority to BR9911322-8A priority patent/BR9911322A/pt
Publication of WO1999065433A1 publication Critical patent/WO1999065433A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B21/00—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
    • D04B21/14—Fabrics characterised by the incorporation by knitting, in one or more thread, fleece, or fabric layers, of reinforcing, binding, or decorative threads; Fabrics incorporating small auxiliary elements, e.g. for decorative purposes
    • D04B21/18—Fabrics characterised by the incorporation by knitting, in one or more thread, fleece, or fabric layers, of reinforcing, binding, or decorative threads; Fabrics incorporating small auxiliary elements, e.g. for decorative purposes incorporating elastic threads
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/04—Plaster of Paris bandages; Other stiffening bandages
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2509/00—Medical; Hygiene
    • D10B2509/02—Bandages, dressings or absorbent pads
    • D10B2509/024—Stiffening bandages, e.g. with plaster of Paris

Definitions

  • the present invention relates to an orthopaedic casting tape and a method for preparing thereof. More particularly, the casting tape containing a substrate prepared by heat shrinkage of a warp knitted fabric comprising a polyester fiber in a chain stitch and in a weft in-lay, a stretch yarn connecting the chain stitches and an elastic fiber, is coated with water-curable polyurethane prepolymer resin.
  • the invention provides 1) better conformability body shape due to multi-axial extension, 2) less constriction to the patient's limbs, 3) sufficient crush strength compared to that of fiberglass cast though it has a thinner layer and 4) significantly reduced localization of coated resin during storage.
  • plaster of Paris There are various ways to immobilize a broken bone or dislocated joint at the site of fracture in the body using a casting material such as plaster of Paris.
  • the plaster of Paris has several disadvantages in that a) the kneading process requiring water for casting is cumbersome, b) the heavy weight of the cast due to its low strength-to-weight ratio brings inconvenience to the patients, c) plaster cast loses the crush strength when it is wet, d) the poor evaporation of water may induce itching and e) the accurate diagnosis cannot be achieved due to its poor transmission of X-ray.
  • U.S. Patent Nos. 3,241,501 and 3,881,473 disclose a casting tape formulated in such a manner that a sheet comprising a textile or knitted fabric is coated with a cast material that can be hardened by exposure to ultraviolet light. However, it requires using an ultraviolet lamp to cure the cast, and it takes a long time to complete the curing process.
  • U.S. Patent No. 3,932,526 discloses a method of fixation by curable reaction between epoxy resin and water.
  • U.S. Patent Nos. 4,131,114, 4,376,438, 4,411,262 and 4,502,479 disclose a method of immobilizing the body at the site of fracture with a synthetic casting tape that uses a sheet comprising fiberglass coated with polyurethane resin.
  • the casting tape is used by dipping it in water and then applying it to the site of fracture.
  • U.S. Patent No. 4,502,479 reportes that fiberglass and polyamide fiber having initial modulus of higher than 8x10 6 psi were suitable fibers for a synthetic casting tape, since the cast with the high modulus fibers shows improved crush strength.
  • the above patent discloses that a fabric knitted with fiberglass is the useful as a substrate of casting tape among various types of fibers.
  • Fiberglass casting tape has several disadvantages in that a) low flexibility brings inconformability to the fracture site, especially to curvatured site, b) harmful dusts of fiberglass, generated during the processes of knitting a substrate and removing the cast, give the risks of respiratory disease and cancer and c) environmental problems can be raised since casting tape is not completely burned up in the hospital incinerator. Accordingly, various efforts has been made to enhance the conformability of casting tape by incorporating other flexible fiber or replacing to other fibers.
  • U.S. Patent No. 4,668,563 discloses a substrate for the casting tape made with a combination of high modulus fibers (more than 8 x 10 6 psi, e.g. fiberglass or polyamide fiber) and elastic fibers (e.g. spandex or rubber).
  • high modulus fibers more than 8 x 10 6 psi, e.g. fiberglass or polyamide fiber
  • elastic fibers e.g. spandex or rubber
  • the shelf life of a product is determined by the retention period of elastic properties for elastic fibers.
  • the elasticity of the elastic fiber gradually decreases by lengthwise tension through long-time storage. Further, it may happen that casts are not conformable to the patient's body because elastic fiber in its substrate provides only lengthwise extension but widthwise extension is restricted by friction between neighboring fibers in configuration.
  • a high elastic recovery of casting tape may induce the constriction to the patient's body.
  • the invention also has various disadvantages by using fiberglass substrate as mentioned above.
  • U.S. Patent No. 5,027,804 discloses a substrate consisting polyester or polypropylene fibers having low heat-shrinkage combined with polyester or polyamide fibers having high heat-shrinkage.
  • U.S. Patent Nos. 5,256,134 and 5,382,466 disclose a substrate for an orthopedic splinting bandage wherein each individual wale contains stitches formed from elastic and inelastic yarns.
  • U.S. Patent No. 5,403,267 reports the substrate for splinting bandage comprising low modulus polypropylene and polyurethane fibers.
  • these inventions using nonfiberglass have several disadvantages in the low crush strength due to low modulus fiber and the increase of thickness of the substrate by using high denier yarns.
  • the objective of the present invention is to solve the above-mentioned problems of the prior arts by providing the casting tape wherein a substrate prepared by heat shrinkage of a warp knitted fabric comprising a polyester fiber in a chain stitch and in a weft in-lay, a stretch yarn connecting the chain stitches and an elastic fiber is coated with water-curable polyurethane prepolymer.
  • the invention provides 1) better conformability to the body shape due to multi-axial extension, 2) less constriction to the patient's limbs, 3) sufficient crush strength compared to that of fiberglass cast though it has a thinner layer and 4) significantly reduced localization of coated resin during storage.
  • Fig. 1 illustrates a 4-bar knitting configuration of substrate.
  • Fig. 2 illustrates a 3-bar knitting configuration of substrate.
  • chain stitch 2. zigzag pattern connecting chain stitches
  • the invention is therefore relates to a casting tape containing a substrate prepared by heat shrinkage of a warp knitted fabric comprising a polyester fiber, knitted in chain stitch and weft in-lay, a stretch yarn connecting the chain stitches and an elastic fiber, is coated with water-curable polyurethane prepolymer.
  • the invention comprises a method for preparing a casting tape, wherein substrate prepared by heat shrinkage process of a warp knitted fabric for 1 to 5 minutes at 60 ⁇ 140 ° C , is coated with 45 ⁇ 65 % by weight of the polyurethane prepolymer resin in the casting tape.
  • the invention is explained in more detail as set forth hereunder.
  • the invention relates to an orthopaedic casting tape and a method for preparing thereof. More particularly, the casting tape wherein a substrate prepared by heat shrinkage of a warp knitted fabric comprising a polyester fiber in a chain stitch and in a weft in-lay, a stretch yarn connecting the chain stitches to give multi-axial extensibility and an elastic fiber to give the lengthwise extensibility, is coated with water-curable polyurethane prepolymer.
  • the invention provides 1) better conformability to body shape due to multi- axial extension, 2) less constriction to the patient's limbs, 3) sufficient crush strength compared to that of fiberglass cast though it has a thinner layer and 4) significantly reduced localization of coated resin during storage.
  • the invention discloses the use of synthetic organic fibers instead of fiberglass in a substrate for a casting tape, therefore eliminating the harmful dusts of fiberglass generated during the manufacturing process and removal of the cast after use.
  • the removed cast can be easily burned in a hospital incinerator.
  • Major factors in screening synthetic organic fibers are moisture content, mechanical properties (initial modulus, tenacity, elongation), fiber density and denier.
  • the moisture incorporated in a fiber can be a factor of shortening the shelf life of the casting tape because of reaction with the isocyanate group of polyurethane prepolymer.
  • the present invention discloses to use fibers with 50 ⁇ 120 g/den of initial modulus which is higher than that of fibers for clothing, preferably 60 ⁇ 110 g/den and 2 - 10 g/den of tensile strength, preferably 5 - 8 g/den.
  • Density and denier of fibers determines the thickness and the weight per unit area of substrate.
  • it needs much more resin content than that of using fiberglass to maintain the crush strength of the cast due to their low modulus. Since, it is necessary to use the substrate with high resin holding property, fiber with appropriate density and denier should be used to obtain sufficient weight per unit area.
  • the thickness of substrate is an important factor on cast application and comfort of the patient. In general, 3 or 4 layers provide a strong nonweight- bearing cast and 5 to 8 layers are typically adequate for weight-bearing cast. However, when organic fiber is used, it needs additional 2 to 3 layers necessary for strength and causes uncomfortable to the patients.
  • the casting tape according to the present invention can be applied with the same layers as fiberglass cast since it has sufficient crush strength compared to that of the fiberglass.
  • the invention discloses that the substrate should have weight of 200 g/ irf, preferably higher than 220 g/ m ! . Therefore, the invention uses polyester which has higher density than that of polyolefin, selected from polyethylene terephthalate, poly(l,4-cyclohexanedimethyl) terephthalate and poly(ethyleneoxybenzoate) and more preferably polyethylene terephthalate.
  • Appropriate range of fiber denier is 200 ⁇ 1000 denier, preferably 300 ⁇ 600 denier.
  • stretch fiber connecting polyester chain stitches gives conformability to the body shape.
  • the stretch yarn is prepared by using thermoplastic property of organic fibers. Stretch yarn, prepared by eliminating one direction deformation after heat-set on the fibers, is characterized by spring structure with superior extensibility and recovery to deformation compared to non-stretch fibers.
  • Stuffing Box Method Fibers are forced into a stuffing-box or similar chamber, and the crimp heat-set in them. This imparts a saw-tooth crimp and gives the greatest bulk of all.
  • the stretch yarn is different from the elastic fiber, which has high extensibility and recovery by chemical structure.
  • widthwise extension of the substrates is determined by weft in-lay pattern.
  • the extensibility by these configurations is restricted by friction between neighboring fibers. Therefore, the invention provides the extensibility in lengthwise and diagonal as well as widthwise direction by connecting the chain stitches.
  • the connecting configuration between chain stitches is straight or zigzag pattern, preferably zigzag pattern. Therefore, the invention provides that the substrate has multi-axial extensibility and improved conformability by the connecting pattern of stretch yarn.
  • Stretch yarn used for the invention preferably includes false twist yarn or texturing yarn of polyester or nylon, more preferably includes polyester texturing yarn with 30 ⁇ 100 denier.
  • the zigzag connecting pattern imparts various directions of extension.
  • the conformability of a casting tape is expressed by extensibility in the lengthwise and widthwise direction of the substrate.
  • the extensibility is determined at a load of 680grams per inch of width, substrate which is connected by stretch yarn has extensibility of 10 ⁇ 30 % in lengthwise direction, 10 ⁇ 60 % in widthwise direction and 30 ⁇ 80 % in diagonal direction.
  • the casting tape using this have desirable crush strength when it has a weight ratio of ca. 6:4 (substrate vs. water-curable resin). Since resin content is relatively lower than that of substrate, localization of resin is minimal during long-time storage. However, while in case using organic fiber for a casting substrate, the desirable crush strength cannot be obtained until weight ratio between substrate and resin reaches 4:6. This amount of resin is more than that of a substrate so that it causes localization of resin because the substrate has not enough resin holding property. As a result, carbon dioxide generated by the reaction between resin and moisture could be stayed as bubble or foam on the localized surface of a cast, resulting in poor appearance.
  • Localization of resin is related to weight per unit area of substrate, uniformity of substrate density, resin-holding ability of fibers.
  • stretch yarn with high resin-holding ability connects chain stitches to maintain uniformity of substrate density and to reduce localization.
  • the substrate of the invention requires a weight per unit area of 200 ⁇ 300 g/ m ! , preferably 220 ⁇ 280 g/ m° to reduce the localization and maintain the crush strength compared to that of fiberglass cast.
  • the elastic fiber which is incorporated in warp direction is used to provide elasticity in a lengthwise direction to the substrate.
  • Preferred elastic fibers include polyester or polyurethane elastic fiber.
  • a covered or uncovered elastic fiber also can be employed.
  • the covering fiber includes cotton, nylon and polyester, preferably polyester fibers.
  • U.S. Patent No. 4,668,563 discloses that an extensibility of 40-200 % may be provided in the lengthwise direction by the addition of a natural rubber yarn or polyurethane elastic fiber (Spandex) in the lengthwise direction.
  • a natural rubber yarn or polyurethane elastic fiber has a high reversible elongation and recovery power, it imparts a pressure to the patients' body during application of the casting tape.
  • a natural rubber yarn gives more pressure than polyurethane elastic fiber because it is difficult to produce below 100 denier.
  • Polyester elastic fiber with 400 - 600 % of reversible elongation gives less constriction than polyurethane elastic fiber with 400 ⁇ 800 % of reversible elongation.
  • the power is defined as a force needed for stretching a substrate in a certain elongation ratio; in the case of a substrate for the casting tape, the power is expressed by a tensile strength per unit inch width at 10 % or 30 % of the elongation [unit: gram per unit inch width].
  • the power of a substrate of the invention is preferably lower than 150 gram per inch width at 10% elongation, more preferably lower than 50 gram per inch width.
  • the extensibility of the substrate is 20 - 80 %, preferably 30 - 70 % in lengthwise direction and 30 - 100 %, preferably 40 - 80 % in widthwise direction.
  • the invention discloses the casting tape which comprises a polyurethane elastic fiber of 30 -100 denier and 0.5 - 3 wt.% or a polyester elastic fiber of 50 - 100 denier and 0.5 - 4 wt.%.
  • the extensibility of the substrate increases but recovery force is too high to have power below 50 gram.
  • loss of elasticity by tension during long-time storage may occur.
  • the substrate with an appropriate extensibility and power is provided by heat shrinkage process.
  • Two kinds of manufacturing process are as follows : One is dry heat- shrinkage process and the other is drying after wet heat-shrinkage process.
  • dry heat-shrinkage process there are two methods of stuffer box and hot air chamber.
  • Wet heat-shrinkage process is a method to shrink in water by using steam or dyeing machine. Even though the shrinking effect is better than that of dry heat-shrinkage process, it requires another drying process and calendaring process because of widthwise shrinkage. According to the invention, dry heat-shrinkage process is more preferable. Dry heat- shrinkage process provides more than 10 % of shrinkage effect, improved extensibility with significantly reduced power. Above results can be obtained by following conditions; 60 - 140 ° C for 1 - 5 minutes.
  • the substrate is prepared by a Raschel or Tricot warp knitting machine.
  • the invention discloses a Raschel warp knitting machine using a 3-bar or 4-bar configuration with 6 - 28 needles per inch. Bar 1 in the knitting configuration executes a chain stitch, bar 2 connects the chain stitches, bar 3 lays in with chain stitch, bar 4 tucks in with chain stitch.
  • the desired substrate which has reduced power according to the present invention is prepared by heat shrinking process with knit fabric having above structure.
  • the density and openness of a substrate affects the resin holding property.
  • the density of a substrate is expressed by the number of courses per inch and the number of openness is the number of wales per inch multiplied by density.
  • the substrate of the invention has 16 - 22 course/ inch of density and
  • the curable prepolymer resin for the casting tape is prepared via the reaction between diisocyanate and polyol.
  • Any diisocyanate compound used for the invention may be selected from those in the literature (Polyurethanes: Chemistry and Technology II 453-607, pp. 609-659, Interscience Publishers). It is preferred to select an aromatic diisocyanate, e.g., phenylene 1,3-diisocyanate, phenylene 1,4- diisocyanate, a mixture of phenylene l,3-/l,4-diisocyanate, toluene 2,4- diisocyanate, toluene 2,6-diisocyanate, a mixture of toluene 2,4-/2,6- diisocyanate, diphenylmethane 2,4-diisocyanate, diphenylmethane 4,4- diisocyanate, a mixture of diphenylmethane 2,4-/ 2,6-diisocyanate, naphthalene 1,5-diisocyanate or diisocyanate polymer containing carbod
  • All of the polyols which have been generally used in the art for polyurethane prepolymer resins designed for the casting tapes can be applied to the invention.
  • the physical properties based on the chemical structures and a person having ordinary skill in the art can readily adjust amount of polyol used without undue experimentation.
  • the polyether homopolymer with a molecular weight in the range of about 200 ⁇ 30,000, preferably in the range of 300 - 20,000 or a combination of such copolymers is used, a high strength cast can be maintained.
  • the amount of hydrophilic polyol should be in the range of less than 50% of the total weight of polyol.
  • the hydrophilic polyol when contacted with water, attracts water to the prepolymer resin and maintains a high strength of the cast.
  • the prepolymer comprises diisocyanate and polyol in a molar ratio of 2: 1 ⁇ 15: 1. If the molar ratio of diisocyanate and polyol is less than about 2:1, the adhesiveness of the substrate is weakened; if it exceeds the molar ratio of about 15: 1, a prolonged period of time is required for curing.
  • the content of isocyanate in a prepolymer prepared via polymerization with the above molar ratio is preferably in the range of about 10 - 25% of the total weight of the prepolymer. Such a range is preferred in terms of curing time and adhesiveness.
  • one or more catalysts can be selected from the following groups, and they should be able to facilitate curing by the reaction with water: amines such as triethylamine, dimethylethanol amine, tetramethyl-l,3-buthane diamine, bis-2- dimethylaminoethyl ether, and triethylene diamine; morpholine-based derivative compounds such as N-methylmorpholine, N-ethylmorpholine, dimorpholinoethyether, dimorpholinodiethoxy ethane, bis(2,6- dimethylmorpholino)ethylether, morpholinoethyl-(2,6- dimethylmorpholinoethyl)ether, l-(2-morpholinoethoxy)-2-(2,6- dimethylmorpholinoethoxy)ethane; inorgaic materials such as sodium bicarbonate, sodium carbonate and calcium carbonate, which are insoluble in prepolymer but soluble in water.
  • amines such as triethylamine,
  • the amount of such catalyst to the total weight of prepolymer is in the range of about 0.5 - 15 wt.%, more preferably in the range of about 1 - 10 wt.%. If amount of such catalyst is below range, the curing may require a prolonged period of time. If it is above the range, the shelf life may be shortened because reaction occurs during storage.
  • antioxidant e.g., sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite, sodium metabisulfite
  • the casting tape of the invention is prepared in such a manner that a substrate is coated with a water curable resin under a relative humidity of less than about 5%. Considering the reactability between the prepolymer and moisture in the air, the casting tape, immediately after the coating process, is placed and sealed in an air-tight package. It is preferred that the amount of resin coated onto the substrate be in the range of about 45 - 65 wt. % to the total weight of the casting tape. The amount expressed by weight is about 160 - 560 g/ in', more preferably about 180 - 520 g/ n . If the amount of resin is below the range, crush strength is lowered. On the other hand, if it is above the range, the localization of the coated resin causes bubbles on the surface of the cast, resulting in poor appearance.
  • a knitted fabric substrate of 4-bar configuration was fabricated by a 12-gauge Raschel warp knitting machine. More specifically, bar 1 contained polyethylene terephthalate yarn of 350 denier with 47 ends executed chain stitch; bar 2 contained a polyester texturing yarn of 70 denier with 46 ends and performed connecting the chain stitches by zigzag pattern; bar 3 contained the same fiber of bar 1 to 0-0/3-3 patterns with 45 ends is weft in- lay; bar 4 contained a polyurethane elastic fiber.
  • KONIX PP-750 Korean polyol product
  • 50 g of KONIX PEG-400, 250 g of KONION PE-108 and a catalyst (bis(2,6- dimethylmorpholino) ethyl ether) were added to the mixture, and then the temperature was increased to 60 ° C .
  • the above mixture was reacted at 60 ° C for 2 hours and then cooled at room temperature under nitrogen atmosphere to obtain a polyurethane prepolymer resin.
  • the substrate was coated with the aforementioned prepolymer resin by using one-roll type coating machine and was packaged into a moisture-proof aluminum pouch.
  • the coated amount of resin was 58%.
  • a 10 m of heating section equipped with 10 free rollers was installed in heating room to perform heat-shrinking the knit fabric prepared in above comparative example 1.
  • the knit fabric passed the heating room, where inside temperature was controlled by circulating hot air, by wind-up roller from outside.
  • the coated amount of resin was 57% .
  • the substrate prepared in comparative example 2 was heat shrunken and coated by the same procedure of example 1.
  • the coated amount of resin was 59%.
  • a knit fabric of 3-bar configuration was fabricated by a 12-gauge Raschel warp knitting machine used in comparative example 1; however, the fabric was knitted without using a stretch yarn compared to the above comparative example 1. More specifically, bar 1 contained polyester yarn of 350 denier with 47 ends; bar 2 contained the same fiber of bar 1 in 0-0/3-3 patterns with 46 ends; Bar 3 contained polyester elastic fiber of 80 denier with 47 ends.
  • the substrate was coated with polyurethane prepolymer by the same procedure of comparative example 1. The coated amount of resin was 58%.
  • a knit fabric of 3-bar configuration was prepared by the same procedure of comparative example 3; bar 1 contained a fiberglass of 68 tex with 47 ends; bar 2 contained the same fiber of bar 1; bar 3 contained polyurethane elastic fiber of 70 denier with 47 ends.
  • the substrate so formulated, was 4 inches in width, 14 courses per inch in density and 220 g/ in' in weight.
  • the substrate was coated with resin by the same procedure of comparative example 1. The coated amount of resin was 42%.
  • a knit fabric of 3-bar configuration was prepared by the same procedure of comparative example 3; bar 1 contained polypropylene fiber of 1000 dtex with 47 ends; bar 2 contained the same fiber of bar 1 with 45 ends; bar 3 contained polyurethane elastic fiber of 70 denier with 47 ends.
  • the substrate so formulated, was 4 inches in width, 16 courses per inch in density and 205 g/ in' in weight.
  • the substrate was coated with resin by the same procedure of comparative example 1. The coated amount of resin was 59%.
  • a knit fabric of 3-bar configuration was prepared by the same procedure of comparative example 3; bar 1 contained polyester stretch yarn of 150 denier with 47 ends; bar 2 contained polyester 2-ply spun yarn with 45 ends; bar 3 contained polyurethane elastic fiber of 70 denier with 47 ends.
  • the substrate so formulated, was 4 inches in width, 15 courses per inch in density and 155 g/ n in weight.
  • the substrate was coated with resin by the same procedure of comparative example 1. The coated amount of resin was 60%.
  • a cylindrical ring comprising 6 layers of casting tape was formed by wrapping the roll around a padding-covered mandrel having a diameter of 5 cm. The ring stood for 24 hours to be cured, and the mandrel was removed from the ring. The ring was placed under a fixing device (Instron Model 4204), and by lowering the cross-head, a given force was recorded when the casting tape was pressed by 1 cm. The lowering rate of the cross-head was predetermined at 2.8 mm/min.
  • the Extensibility of the casting tape was determined as the percentage of elongation at 680 gram load per 1 inch of width.
  • the power was determined as the force needed for stretching the casting tape at 10 % elongation.
  • Equation 1 (2) Content of resin After opening the casting tape having 4 inches in width, it was immersed in a beaker containing 1000 ml of acetone for 3 hours to dissolve the resin coated onto the substrate. It was washed 3 times with acetone. The weight of the dried substrate was measured and calculated by following equation 1. Equation 1
  • the tape was left for a sufficient period of time. Then, the cured tape was cut into pieces of 5.0 cm of width. The pieces were weighed and the standard deviation of weight was calculated.
  • the invention relates to an orthopedic casting tape and a method for preparing thereof. More particularly, the casting tape of the invention is prepared in such a manner that a substrate prepared by heat shrinkage of a warp knitted fabric comprising a polyester fiber in a chain stitch and in a weft in-lay, a stretch yarn connecting the chain stitches and an elastic fiber, is coated with water-curable polyurethane prepolymer.
  • the invention provides 1) multi-axial extension and conformability to body shape, 2) less constriction to the patient's limbs, 3) sufficient crush strength compared to that of fiberglass cast and 4) significantly reduced localization of coated resin during storage.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Textile Engineering (AREA)
  • Materials For Medical Uses (AREA)

Abstract

L'invention concerne une bande plâtrée orthopédique et son procédé d'obtention. L'invention concerne plus particulièrement une bande plâtrée contenant un substrat obtenu par thermorétrécissement d'un tricot chaîne comprenant une fibre polyester en point de chaînette et en trame horizontale. Un fil élastique reliant les points de chaînette et la fibre élastique est enduit d'une résine prépolymère de polyuréthanne durcie à l'eau. En l'occurrence, l'invention assure 1) une meilleure conformité à la forme du corps grâce à l'extension multiaxiale, 2) un moindre étranglement des membres du patient, 3) une cohésion suffisante par rapport au plâtre renforcé à la fibre de verre malgré une couche plus fine et 4) une couche sensiblement réduite de résine enduite pendant le stockage.
PCT/KR1999/000324 1998-06-19 1999-06-19 Bande platree orthopedique et son procede d'obtention WO1999065433A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2000554314A JP2002518094A (ja) 1998-06-19 1999-06-19 整形外科用キャスティングテープ及びその製造方法
AU43986/99A AU4398699A (en) 1998-06-19 1999-06-19 Orthopaedic casting tape and a method for preparing thereof
BR9911322-8A BR9911322A (pt) 1998-06-19 1999-06-19 Fita de moldar ortopédica e método para preparar a mesma

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR19980023215 1998-06-19
KR1998/23215 1998-06-19

Publications (1)

Publication Number Publication Date
WO1999065433A1 true WO1999065433A1 (fr) 1999-12-23

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PCT/KR1999/000324 WO1999065433A1 (fr) 1998-06-19 1999-06-19 Bande platree orthopedique et son procede d'obtention

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JP (1) JP2002518094A (fr)
CN (1) CN1311650A (fr)
AU (1) AU4398699A (fr)
BR (1) BR9911322A (fr)
WO (1) WO1999065433A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002060499A1 (fr) * 2001-02-01 2002-08-08 Ebi, L.P. Platres orthopediques dotes d'une flexibilite regulee
US7181933B2 (en) 2004-08-27 2007-02-27 Milliken & Company Tape substrate and tape made therefrom
EP3009020A1 (fr) * 2014-10-17 2016-04-20 COFEMEL - Sociedade de Vestuário S.A. Article d'habillement et son procédé de production
US11690746B2 (en) 2004-04-02 2023-07-04 Applied Biokinetics Llc Pre-cut adhesive supports for anatomical support, pain reduction, or therapeutic treatment
US11753754B2 (en) 2018-08-21 2023-09-12 Owens Corning Intellectual Capital, Llc Multiaxial reinforcing fabric with a stitching yarn for improved fabric infusion
US11913148B2 (en) 2018-08-21 2024-02-27 Owens Corning Intellectual Capital, Llc Hybrid reinforcement fabric

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CN101411656B (zh) * 2008-11-15 2011-12-14 李新民 一种骨伤外固定装置的制作方法
CN102397133B (zh) * 2011-11-15 2015-06-03 大连壹灏医疗用品有限公司 医用聚氨酯高分子绷带

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WO1995011647A1 (fr) * 1993-10-25 1995-05-04 Minnesota Mining And Manufacturing Company Tissus compactes destines aux bandes orthopediques durcissables
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Cited By (10)

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WO2002060499A1 (fr) * 2001-02-01 2002-08-08 Ebi, L.P. Platres orthopediques dotes d'une flexibilite regulee
US6673727B2 (en) 2001-02-01 2004-01-06 Ebi, L.P. Orthopedic casts with controlled flexibility
US11690746B2 (en) 2004-04-02 2023-07-04 Applied Biokinetics Llc Pre-cut adhesive supports for anatomical support, pain reduction, or therapeutic treatment
US7181933B2 (en) 2004-08-27 2007-02-27 Milliken & Company Tape substrate and tape made therefrom
US7285505B2 (en) 2004-08-27 2007-10-23 Milliken & Company Tape having weft-insert warp knit fabric reinforcement
EP3009020A1 (fr) * 2014-10-17 2016-04-20 COFEMEL - Sociedade de Vestuário S.A. Article d'habillement et son procédé de production
US10463084B2 (en) 2014-10-17 2019-11-05 COFEMEL—Sociedade de Vestuário, S.A. Garment and manufacturing method
US11147321B2 (en) 2014-10-17 2021-10-19 COFEMEL—Sociedade de Vestuário, S.A. Garment and manufacturing method
US11753754B2 (en) 2018-08-21 2023-09-12 Owens Corning Intellectual Capital, Llc Multiaxial reinforcing fabric with a stitching yarn for improved fabric infusion
US11913148B2 (en) 2018-08-21 2024-02-27 Owens Corning Intellectual Capital, Llc Hybrid reinforcement fabric

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JP2002518094A (ja) 2002-06-25
CN1311650A (zh) 2001-09-05
AU4398699A (en) 2000-01-05

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