JP3345471B2 - Medical auxiliary materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a medical auxiliary material used for surgical treatment and the like, more specifically, to contract at a low temperature,
The present invention relates to a medical auxiliary material used as a cloth material for a cast, a bandage, a taping material, a base cloth for a compress material, and the like.

[0002]

2. Description of the Related Art Conventionally, in surgery, especially in orthopedic surgery,
Gypsum plaster casts are mainly used as casts used for treatment of fractures and correction of limbs. Gypsum plaster casts are obtained by mixing water with a composition of calcined gypsum and a melamine / formaldehyde resin, applying the semi-fluid to a limb or the like wound with a bandage, and curing. Although this plaster of Paris is effective for fixing and protecting the affected area, it has drawbacks that it must not be brought into contact with hot water when taking a bath, is heavy, and has skin irritation. In order to solve such a defect, a resin composition having plasticity at a temperature of 60 ° C. or more and having rigidity at normal temperature (for example, a vinyl resin having a glass transition point of less than 30 ° C. disclosed in JP-A-60-41969). A resin composition mainly composed of a polymer, a resin composition prepared by blending a polyisoprene disclosed in JP-A-60-203261 with a polymer obtained by grafting vinyl chloride to an ethylene-vinyl acetate copolymer or a polyester resin, etc. ) Or a resin composition that is cured by adding an additive such as water (for example,
Water-curable urethane-based resin compositions disclosed in JP-A-3-45263 and JP-A-3-69360)
Is impregnated with a cloth material for casting in a state before curing, and is mounted on an affected part and then cured, so that a plastic casting is proposed. This plastic cast has the advantage that it is possible to take a bath with the cast, and that it is light. But,
The resin impregnated Gibbs cloth material when curing wound to the body, since the Gibbs cloth material itself does not dimension change, inevitably cured resin at will by a gap, a gap condition between the body As a result, the affected part may not be sufficiently protected, or the cast may not fit the body and may be displaced from the affected part. In addition, bandages and taping materials may be loosened after being wound around the body, or a gap may be formed between the bandage and the body, so that the affected part may not be sufficiently protected.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional disadvantages. For example, when the present invention is used as a cloth material or a bandage for a plastic cast, it is necessary to secure the close contact with the body. The purpose is to obtain a medical auxiliary material that can be used.

[0004]

The medical auxiliary material of the present invention comprises a cold-shrinkable filament or a cold-shrinkable filament.
A nonwoven fabric obtained by entanglement of a knitted woven fabric with a fiber web and a nonwoven fabric is attached to the affected part, for example, by heating with a drier or the like, and adheres tightly to the affected part, shrinks at a low temperature, and can be easily performed. Gibbs, bandages, orthopedic parts such as limbs and fingers, taping materials, etc. that can be attached to the affected area, look good, do not irritate the skin when worn on the skin, and can be easily removed It provides medical auxiliary materials.

Since the medical auxiliary material of the present invention is made of a nonwoven fabric which contracts at a low temperature, the medical auxiliary material can be easily attached simply by attaching it to the affected part and heating it, which is extremely advantageous in surgical treatment. . For example, when using the medical auxiliary material of the present invention as a cloth material for casting, impregnating the resin before curing, winding it around the affected area and heating it with a drier or the like, by shrinking the low-temperature shrinkable filament,
Can be in close contact with the body. Thereafter, the resin is cured to form a cast tightly fixed to the body.

Further, since the medical auxiliary material of the present invention transmits X-rays, there is an advantage that an X-ray can be taken with the surgical medical auxiliary material attached. Further, the medical auxiliary material of the present invention has a practical effect that there is no danger of generating dust and the like, no irritation to the skin, and no unpleasant feeling when worn. Hereinafter, the present invention will be described in detail.

As the low-temperature shrinkable fiber, a low-temperature shrinkable filament or a low-temperature shrinkable staple fiber obtained by cutting a low-temperature shrinkable filament into a predetermined length can be used. As the low-temperature shrinkable filament, any filament may be used as long as it has a low-temperature shrinkability that shrinks at a low temperature of 45 to 70 ° C.
The following filaments disclosed in JP-A-6-1994 and JP-A-3-199417 are preferred. It is composed of a composition obtained by mixing 3 to 30% by weight of polycaprolactone with high-density polyethylene, (a) tensile strength is 4 g / d or more, (b) knot strength is 3 g / d or more, and (c) elongation at break is 5% or more. The main component is a filament or polyethylene.
1.5-7.0% by weight of carbon monoxide or modified polyethylene 2 copolymerized with other ethylenically unsaturated compounds
0-50% by weight, 3-30% by weight of polycaprolactone and 20-77% by weight of high-density polyethylene,
(a) Tensile strength of 3 g / d or more, (b) Knot strength of 2 g / d
d or more, and (c) a filament having a breaking elongation of 5% or more.

The high-density polyethylene used in the present invention generally has a density of 0.94 produced by a low-pressure method.
g / cm3 or more and a melt flow rate of 20 or less, preferably 2 or less are suitable. Polycaprolactone has a melting point of about 60 ° C. obtained by ring-opening polymerization of ξ-caprolactone, and has a molecular weight of 10,000 to 100,000.
Preferably, those having 20,000 to 50,000 are suitable. It is necessary that the compounding amount of polycaprolactone be 3 to 30% by weight. If the amount is less than 3% by weight, only filaments with insufficient low-temperature shrinkage can be obtained, while if it exceeds 30% by weight, high-strength filaments cannot be obtained, which is not practical.

The modified polyethylene used in the present invention is a photodegradable polyethylene containing ethylene as a main component and copolymerizing carbon monoxide or carbon monoxide with another ethylenically unsaturated compound. The ratio of carbon oxide is 1.
The content is 5 to 7.0% by weight, preferably 2.0 to 4.0% by weight. When the copolymerization ratio of carbon monoxide is less than 1.5% by weight, the photolysis rate is extremely low, while 7.0% by weight.
If it exceeds, the strength of the filament decreases and the photodisintegration speed becomes too high, and the strength is reduced in a short period of time. The photodecomposition rate can be adjusted by the copolymerization ratio of carbon monoxide, and the copolymerization ratio of carbon monoxide is appropriately selected according to the purpose of use of the filament. Examples of the ethylenically unsaturated compound used in the present invention include vinyl acetate, vinyl butyrate, (meth) acrylic acid, methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, and maleic acid.
Fumaric acid, acrylonitrile, acrylamide, vinyl methyl ether, vinyl phenyl ether, styrene,
Vinyl chloride, propylene, butene-1, hexene-1,
There are octene-1, decene-1, 4-methylbenthene-1 and the like, and vinyl acetate and ethyl acrylate are particularly preferred in view of spinnability and mechanical properties of the obtained filament, heat resistance, gloss and the like. . When an ethylenically unsaturated compound such as vinyl acetate or ethyl acrylate is copolymerized with carbon monoxide, photodecomposition after a certain period of time can be rapidly caused. When the ethylenically unsaturated compound is copolymerized, the copolymerization ratio is preferably from 1 to 20% by weight.

Further, a reaction temperature of 150 to 300.degree.
Under the condition of 2,000 atm, dilauroyl peroxide,
Dissolve a free radical generator such as tertiary butyl peroxide, tertiary butyl perisobutyrate, tertiary butyl peracetate or α, α'-azobisisobutyronitrile in an insoluble organic solvent such as benzene, kerosene or mineral oil The resulting mixture is injected into a reactor, and a method of copolymerizing ethylene with carbon monoxide and other ethylenically unsaturated compounds as needed, using a medium-to-low pressure method high-density polyethylene production apparatus, a reaction temperature of 50 to 300 ° C. Ethylene and carbon monoxide by a slurry method, a solution method, a gas phase method or the like in the presence of a coordination catalyst or a metal catalyst (such as a Ziegler type, a Natta type or a Phillips type) under a pressure of 0 to 200 atm. With other ethylene and carbon monoxide and other ethylene and carbon monoxide and, if necessary, other ethylenically unsaturated compounds. It can be produced by a method of polymerizing.

Each component is melt-mixed with an extruder to form chips, and then melt-spun. However, both may be supplied to a spinning apparatus and mixed and spun. The filament used in the present invention can be manufactured by the following method. First, a mixture of high-density polyethylene or the like and polycaprolactone at a predetermined ratio is subjected to melt spinning, and the melt spinning is preferably performed at a temperature of 230 to 300 ° C. At a spinning temperature of 230 ° C., melt extrusion is difficult, and when it exceeds 300 ° C., the polymer is decomposed, and it is difficult to obtain a high-strength filament. The melt-spun filament is water-cooled, after winding once, or continuously without winding, hot air or heated water,
It is stretched in a catalyst such as glycerin or silicone oil. The stretching conditions such as the stretching temperature and the stretching ratio are appropriately selected depending on the required performance of the target filament.
In general, it is appropriate to draw 10 to 17 times at or above the glass transition temperature of the undrawn filament, that is, at a temperature of about 60 to 110 ° C. The stretching is preferably performed in multiple stages of two or more stages, and it is difficult to stretch sufficiently in one-stage stretching, and it is difficult to obtain a high-strength filament. The drawn filament is then subjected to a relaxation treatment in an atmosphere at a temperature of 50 to 110 ° C. to produce a filament having desired properties. In this case, 1-5% is appropriate for the intense tempo. The thus obtained filament of the present invention has the above-mentioned excellent properties of high drawability, low-temperature shrinkage and microbial disintegration. The fineness of the filament of the present invention is appropriately selected depending on the application. Further, if necessary, additives such as an oxidation promoter and a pigment can be included.

The nonwoven fabric used in the present invention forms a web containing the above-mentioned low-temperature shrinkable filament or a low-temperature shrinkable fiber obtained by cutting the low-temperature shrinkable filament to a predetermined length. It is manufactured by applying an entanglement means such as a method or a stitch bonding method. Since it is desirable that the temperature at which the low-temperature shrinkable filament shrinks is not applied to the nonwoven fabric during the manufacturing process, a manufacturing process by entanglement is used as a fiber bonding process of the nonwoven fabric. Further, the composite nonwoven fabric used in the present invention is obtained by laminating a fabric obtained by aligning the above-mentioned low-temperature-shrinkable filaments or a woven or knitted fabric made from the low-temperature-shrinkable filaments with a fiber web. It is manufactured by applying an entanglement means such as a legal method, a needle punch method, or a stitch bond method. Known fibers such as polyester fiber, nylon fiber, polypropylene fiber, acrylic fiber, rayon fiber and wool can be used for the fiber web used for the composite nonwoven fabric. The low-temperature shrinkable filament or the knitted fabric using the low-temperature shrinkable filament and the fibrous web may be laminated one by one, but may be laminated in plural layers, for example, using a low-temperature shrinkable filament or a low-temperature shrinkable filament. A structure in which a knitted fabric is sandwiched between two fiber web layers may be used. The laminate is integrated by being entangled with the fibers by an entanglement means such as a needle punch or a water entanglement to form a composite nonwoven fabric.
When using the stitch bond method as the entanglement means,
Without producing the laminate, a low-temperature shrinkable filament may be stitched to a fiber web as a stitch yarn to form a composite nonwoven fabric. In addition, it is desirable that the low-temperature shrinkable filament is used in the longitudinal direction of the composite nonwoven fabric.For example, when using a low-temperature shrinkable filament that is aligned, the alignment direction and the longitudinal direction of the composite nonwoven fabric are matched. When the low-temperature shrinkable filament is used as a woven fabric or the like, it is preferable that only the warp yarn is formed of the low-temperature shrinkable filament and the longitudinal direction of the warp yarn matches the longitudinal direction of the composite nonwoven fabric. By doing so, the composite nonwoven fabric shrinks only in the longitudinal direction and the dimension in the width direction becomes constant. There is no fear that a gap is formed between the non-woven fabric wound around the non-woven fabric.

When the medical auxiliary material of the present invention is used, for example, as a cloth material for casting, the resin composition having plasticity at the above-mentioned temperature of 60 ° C. or more and rigidity at room temperature, or the addition of water or the like. By adding the agent,
After impregnating with a resin composition to be cross-linked and cured, and winding it around the affected area, the medical auxiliary material is shrunk by heating with a hand dryer or the like, and then left to return to room temperature, or an additive is added. Thereby, the resin composition can be cured to form a plastic cast. In particular, when a resin composition that crosslinks and cures is used,
Even if a high temperature is applied, the plastic cast does not need to be re-deformed. The resin composition may contain a conventionally known magnetic powder such as a magnetic ferrite powder or an anionic magnetic powder, or an anti-inflammatory agent such as methyl salicylate, menthol, camphor, or funnel extract. In addition, when using the medical auxiliary material comprising the composite nonwoven fabric of the present invention, besides impregnating the resin composition as a whole, the resin composition may be applied only to the low-temperature shrinkable filament or the knitted fabric comprising the low-temperature shrinkable filament. May be impregnated. In this case, in the manufacturing process of the composite nonwoven fabric, a low-temperature shrinkable filament or a knitted fabric made of a low-temperature shrinkable filament impregnated with a resin composition is laminated with a fiber web, and the laminate is entangled to form a composite. What is necessary is just to manufacture a nonwoven fabric. In particular, when the cast is not required to have strength or water resistance, only the medical auxiliary material may be wound around the affected part without heat impregnation and fixed by heat shrink treatment. The medical auxiliary material of the present invention can be used as a bandage, a taping material and the like in addition to the above-mentioned cloth material for casting. In these cases, it can be used by being wrapped around the body as it is and tightly fixed to the body by a heat shrink treatment. When the medical auxiliary material is subjected to a heat shrink treatment, the heat treatment temperature is preferably 45 to 70 ° C. at which the low-temperature shrinkable filament shrinks, and particularly preferably 5 to 70 ° C.
0-60 ° C is preferred.

[0014]

EXAMPLES Example 1 Polyester fiber 1 having a fineness of 3 denier and a fiber length of 51 mm
A multifilament (a polycaprolactone fiber PCL manufactured by Unitika Ltd.) composed of 12 low-temperature shrinkable filaments having a denier of 6 deniers was aligned and laminated on a fibrous web having a basis weight of 50 g / m ² of 00% and 25 per inch. . This laminate was subjected to a water entanglement treatment under the condition of a water pressure of 90 kg / cm ² , and then air-dried to obtain a medical auxiliary material composed of a composite nonwoven fabric in which fibers were entangled. The tensile strength and elongation before and after the contraction of this medical auxiliary material and the contraction rate were examined and are shown below. Strength before shrinkage Vertical: 12 kg / 5 cm width, Horizontal: 3 kg / 5 cm width Strength after shrinkage Vertical: 23 kg / 5 cm width, Horizontal: 8 kg / 5 cm width Elongation before shrinkage Vertical: 27%, W: 60% Elongation after shrinkage Vertical : 10%, Horizontal: 50% Shrinkage ratio Heated at 50 ° C for 10 seconds Vertical: 80%, Horizontal: 10% Heated at 60 ° C for 10 seconds Vertical: 90%, Horizontal: 10% Heated at 70 ° C for 10 seconds Vertical: 95% Horizontal: 10% This medical auxiliary material was cut into a bandage by cutting it to a width of 5 cm so that the filament was arranged in the longitudinal direction, and wound around the second joint of the middle finger of the right hand three times. Thereafter, when heated with a hair dryer to a temperature of about 55 ° C., the medical auxiliary material contracted in the longitudinal direction, and was closely fixed to the middle finger. After contraction, the joint was not easily bent and fixation was sufficient.

Example 2 A low-temperature shrinkable filament having a fineness of 500 denier (polycaprolactone fiber PCL manufactured by Unitika Ltd.) was used for the warp yarn, and a polyester monofilament having a fineness of 100 denier was used for the weft yarn. A woven fabric having a basis weight of 50 g / m ² at 10 yarns / inch is produced. The woven fabric and a fibrous web having a basis weight of 30 g / m ² composed of 100% polyester fiber having a denier of 3 denier and a fiber length of 51 mm are laminated so that the warp yarn of the woven fabric is arranged in the longitudinal direction of the composite nonwoven fabric, and the water pressure is 90 kg. A hydro-entanglement treatment was performed under the conditions of / cm ² to obtain a medical auxiliary material composed of a composite nonwoven fabric in which the constituent fibers of the fiber web were entangled with the woven fabric. The tensile strength and elongation before and after the contraction of this medical auxiliary material and the contraction rate were examined and are shown below. Strength before shrinkage Vertical: 39kg / 5cm width, Horizontal: 10
kg / 5cm width Strength after shrinkage Vertical: 61kg / 5cm width, Horizontal: 15
kg / 5cm width elongation before shrinkage vertical: 5%, horizontal: 10% elongation after shrinkage vertical: 2%, horizontal: 5% shrinkage ratio Heating at 50 ° C for 20 seconds vertical: 80%, horizontal: 10% at 60 ° C Heating for 20 seconds Vertical: 90%, Horizontal: 10% Heating at 70 ° C for 20 seconds Vertical: 95%, Horizontal: 10% This medical auxiliary material was cut into a bandage of 10 cm in width, and wrapped around the knee of the right leg three times. . Thereafter, when heated with a hair dryer to a temperature of about 55 ° C., the medical auxiliary material shrunk in the longitudinal direction, and was closely fixed to the knee. After shrinking, the knee was not easily bent and fixation was sufficient. The medical auxiliary material was cut into a bandage having a width of 10 cm, impregnated with a water-curable urethane resin composition, and wound around the right arm three times. Thereafter, when heated with a hair dryer so as to reach a temperature of about 55 ° C., the medical auxiliary material contracted in the longitudinal direction and adhered to the right arm. Next, water was added to cure the urethane resin composition to form a plastic cast. This plastic cast was durable and light, it was possible to take a bath with the cast on, and there was no unnecessary gap between the cast and the right arm. .

[0016]

Since the medical auxiliary material of the present invention has a low-temperature shrinkage property, it can be shrunk by applying heat while being attached to the body, so that it can be easily adhered and fixed so as to fit the shape of the body. It is possible to reliably protect the affected part and the like. Therefore, the medical auxiliary material of the present invention is suitable for a cloth material for casts, a bandage, a taping material, a base cloth for a poultice, and the like. It is good because it can produce a cast that suits the requirements.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A61L 15/00-15/07

Claims (4)

(57) [Claims] 1. A cold-shrinkable filament or cold-shrink
Woven fabric using conductive filament and fiber web
A medical auxiliary material comprising a composite nonwoven fabric. 2. The composite material according to claim 1, wherein the low-temperature shrinkable filament is a composite nonwoven fabric.
2. The method according to claim 1, wherein the first member is used in a longitudinal direction.
Medical auxiliary materials as described. 3. The low-temperature shrinkable filament is a high-density poly
3 to 30% by weight of polycaprolactone mixed with ethylene
(A) a tensile strength of 4 g / d or less
Above, (b) knot strength is 3 g / d or more and (c) cut elongation
2. The medical device according to claim 1, wherein
Secondary treatment materials. 4. The method according to claim 1, wherein the low-temperature shrinkable filament is a polyethylene.
1.5 to 7.0% by weight of carbon monoxide or
Is a copolymer of this and another ethylenically unsaturated compound.
Polyethylene 20-50% by weight, polycaprolactone
3 to 30% by weight and high density polyethylene 20 to 77 weight
%, (A) tensile strength of 3 g / d or more, (b)
Knot strength of 2 g / d or more and (c) elongation at break of 5% or more
The medical auxiliary material according to claim 1, wherein: