KR101882308B1

KR101882308B1 - Splint for orthopedics

Info

Publication number: KR101882308B1
Application number: KR1020160098440A
Authority: KR
Inventors: 배진우
Original assignee: 비엘테크 주식회사
Priority date: 2016-08-02
Filing date: 2016-08-02
Publication date: 2018-07-27
Also published as: WO2018026064A1; KR20180014952A

Abstract

One embodiment of the present invention is a splint made of a support layer coated with a hydraulically hardened resin, wherein the support layer is made of a mixed yarn comprising a polyester DTY (Draw Textured Yarn) and a polyester SDY (Spin Drawn Yarn) Wherein the support layer comprises an outer layer and an inner layer interposed between the outer layers, the outer layer being interconnected by the inner layer comprising a plurality of voids such that the support has an integral structure.

Description

{SPLINT FOR ORTHOPEDICS}

The present invention relates to an orthopedic splint having high strength.

Orthopedic splint is a device that is used to limit the mobility of the affected part when an emergency such as trauma or fracture of the body, fracture, sprains or sprains occurs, and to tighten the wound partially or wholly to stabilize the affected part .

Generally, splints form a three-layer structure including an endothelial layer, an outer sheath layer, and a support layer interposed therebetween. As the support layer, glass fiber or nonwoven fabric base material is most widely used.

In the case of a glass fiber fabric substrate, multiple layers, usually 8 layers of glass fiber fabric, are used in layers. The splint should be excellent in air permeability because it is fixed in contact with the skin for a certain period of time, and should have excellent elasticity because it must be cured in a desired shape according to the affected part. The glass fiber fabric is excellent in air permeability and stretchability and is suitable for application as a support layer of splint.

However, glass fiber fabrics are relatively expensive, have a difficulty in disposing of waste after use, have a risk of secondary injury due to sharp cut edges, and are at risk of causing skin allergy.

In addition, the nonwoven fabrics are less lightweight than the glass fibers, are less expensive, and are not dangerous at the time of cutting. However, since they have poor air permeability than glass fibers and have poor molding due to the volume of the nonwoven fabric itself, Is significantly lower than that of glass fibers.

Polyester fabrics have been proposed in order to overcome the problems of glass fiber and nonwoven fabrics. Actually, a product in which 7 to 8 layers of polyester fabrics are laminated has been developed. However, since the strength and cutability are poor, have. Therefore, development of a support layer material for improving the above problems is required.

Korean Patent Registration No. 0859879 (September 17, 2008)

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art, and it is an object of the present invention to provide an orthopedic splint that is excellent in cuttability and moldability, is easy to apply to the affected part, and has improved strength.

According to an aspect of the present invention, there is provided a splint made of a support layer coated with a hydraulically curable resin, wherein the support layer is made of a mixed yarn including a polyester DTY (Draw Textured Yarn) and a polyester SDY (Spin Drawn Yarn) Wherein the support layer comprises an outer layer and an inner layer interposed between the outer layers, the outer layer being interconnected by the inner layer comprising a plurality of voids such that the support has an integral structure.

In one embodiment, the hydroscopic resin may be a polyurethane prepolymer.

In one embodiment, the thickness of the mixed yarn may be less than 500 denier.

In one embodiment, the weight ratio of polyester DTY and polyester SDY in the blended yarn may be between 2: 1 and 1.5, respectively.

In one embodiment, the thickness of the support layer may be between 5 and 15 mm.

In one embodiment, the porosity of the support layer may be between 20 and 50% by volume.

The support layer of the orthopedic splint according to an embodiment of the present invention may be woven with blended yarn including two types of polyester having different functions to simultaneously realize durability, formability, and wearing convenience of the splint.

In addition, the outer layer of the support layer can be interconnected by an inner layer containing a plurality of voids, and can be integrally formed, that is, can be made in one layer, thereby remarkably improving moldability and adherence to the affected portion. It can be easily impregnated and has excellent strength.

It should be understood that the effects of the present invention are not limited to the effects described above, but include all effects that can be deduced from the description of the invention or the composition of the invention set forth in the claims.

FIG. 1 is a diagram illustrating the structure of a support layer according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "indirectly connected" . Also, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The support layer may include an outer layer and an inner layer, and the outer layer and the inner layer may be integrally woven into a mixed yarn, and the mixed yarn may include polyester DTY (Draw Textured Yarn) and polyester SDY (Spin Drawn Yarn) have.

Generally, the fiber yarn is subjected to a drawing process after the spinning process. The spinning process refers to pulling a thread through a hole that dissolves a polymer material that can make a fiber. Types of radiation include wet spinning, dry spinning, and melt spinning.

The wet spinning method is a method that is used when the polymer solvent does not volatilize rapidly or when the polymer is heated and is not melted but is decomposed into fibers. The spinning solution is sent into the coagulating solution through the spinneret and solidified by chemical reaction or dehydration. It is the oldest spinning method currently used and has a disadvantage of slow spinning speed compared to dry / melt spinning, followed by post-treatment such as washing, dehydrating and drying, but it can make many spinnerets. The wet spinning method is widely used for spinning acryl, rayon, polyvinyl alcohol (PVA), polyvinyl chloride (PVC), and the like.

The dry spinning method is a method in which a semisolid or polymer is dissolved in a volatile solvent to spin it in a liquid state. It is widely used in high-molecular-weight materials that are difficult to heat-melt and high-molecular-weight materials that are easily decomposed. As the solvent, it is preferable that boiling point such as acetone or carbon disulfide and the heat of vaporization are low. It has a higher spinning speed than wet spinning and is widely used for spinning polyurethane, polyvinyl acetate, and the like.

The melt spinning is a method in which the polymer is heated to a temperature of the melting point or higher and melted, and then extruded through a spinneret while cooling to obtain a fiber state. The melting temperature is preferably 300 ° C or less, the spinning speed is very fast, spinning can be performed at 500 to 1,500 m / min, and further high-speed spinning is possible. There is no need for a post-treatment such as spinning, drying, and the like, which is used more than the above-mentioned wet and dry spinning. Polyester, Nylon and so on.

In the stretching process, the fibers immediately after the spinning process are weak in strength due to insufficient uniformity of molecular arrangement, and are thermally and tensilely oriented (orientated) at room temperature, thereby tending to adjust the fiber direction to impart recognized strength and physical properties.

The kind of the fiber yarn can be divided according to the spinning speed, the stretching and the smearing process. The polyester DTY (Draw Textured Yarn) yarn is twisted (false twisted) while stretching the yarn to impart crimp or bulky to the surface of the yarn, have.

The polyester DTY yarn forms a spiral structure and can be adjusted in length, so that it is excellent in stretchability, and the polyester yarn swells due to the spiral structure to form a three-dimensional structure having a voluminous feel.

The polyester SDY (Spin Drawn Yarn) yarn is produced by a process in which a stretching process and a thermal process are concurrently performed in a spinning process, that is, polymerization, spinning, stretching, Of the circle. Polymerization, spinning, drawing, and winding are carried out at the same time, the polyester SDY yarn is thin and light, so that the adhesion and formability of the splint can be improved.

Therefore, the polyester DTY yarn can control the three-dimensional structure, that is, the formation of voids in the support layer due to the spiral structure, so that the impregnation amount of the hydrolyzable resin can be controlled. The polyester SDY yarn is thin and light, You can control sex.

Particularly, by adjusting the thickness of the mixed yarn to a predetermined range to weave the support layer, the formability of the splint can be improved finally, and the weight can be reduced to improve the wearing convenience. Specifically, the mixed yarn may have a thickness of 500 denier or less, preferably 300 denier to 500 denier. If the thickness of the yarn exceeds 500 denier, the yarn becomes thick and tainted, and cutability and formability may be deteriorated.

As used herein, the term " denier " is a unit of international standard used for indicating the thickness of long filaments, such as silk, in synthetic fibers, regenerated fibers, or natural fibers. When the length of the yarn is 9,000 m, 1 g, it is defined as 1 denier. For example, a 10 denier has a length of 9000 m, a yarn weight of 10 g, a 100 denier, a length of 9000 m, and a yarn weight of 100 g. The larger the denier value, the thicker the yarn, and the smaller the denier, the smaller the yarn.

The weight ratio of the polyester DTY and the polyester SDY in the mixed yarn may be 2: 1 to 1.5, respectively. If the mixing ratio of the polyester DTY yarn is low, the impregnation amount of the water-hardenable resin may be decreased to lower the strength of the splint. If the mixing ratio of the polyester DTY yarn is excessively high, polyester SDY yarn is relatively decreased, And the moldability may be lowered.

On the other hand, the support layer integrally woven by the polyester mixed yarn has a three-dimensional structure. FIG. 1 is a diagram illustrating the structure of a support layer according to an embodiment of the present invention. Referring to FIG. 1, the polyester mixed yarns constituting the support layer may include mutually parallel outer layers and outer layers interposed between the outer layers.

The yarns of the inner layer interconnecting the outer layers are irregularly arranged in a loose structure so that a space, that is, a gap, can be formed between the yarns, and a certain amount of the hydraulic resin is impregnated in the gap, Can be easily adjusted. In addition, since the two outer layers have a three-dimensional structure connected with the inner layer even though they are woven in one layer, it is possible to improve the wearing comfort by imparting the same cushioning feeling as in the case where the support layers are laminated in three or more layers.

The support layer of this structure can be woven by a lacquer machine. As the knitting machine of the warp knitting fabric, the lacquer machine uses yarn or filament yarn of various kinds of natural or artificial fibers as a knitting yarn, and weaves the fabric by combining other knitting structures on the basis of chain weaving. A warp knitted fabric is a fabric that is fed from the longitudinal direction to make a loop in the longitudinal direction.

The general weaving sequence of the warp knitted fabric is that the crochet with the various lace is inserted into the front loop, the new yarn is hooked on the crochet, and the yarn is taken out into the loop to make a new loop. When this process is repeated, chain stitch, Chain knit organization and this is the basic organization of warp knit fabrics. However, since the fabric can not be formed only by the basic structure, when the guide for supplying the knitting yarn is alternately shifted to the left and right when the new loop is made, the loops of the left and right are connected to each other so that the fabric can be woven.

The lacquer should be wound around a laselege by winding a knitting yarn to be supplied to a guide or a guide needle for supplying a knitting needle and a knitting yarn at the time of weaving, and the number and the needle of the beam and the guide need to be varied depending on the type of tissue of the warp knitting fabric Do. When the needle bed is one row, it is called one-row needle bed or single needle bed. The lacquer group in the monoclinic form is called a single raschel and the lacquer in a double row form is called a double raschel.

Since the support layer has a three-dimensional structure in which two outer layers are interconnected by an inner layer interposed therebetween by using mixed yarn, it is preferable that the support layer be woven with a double lath group of a double row rather than a single row lattice.

If the thickness of the support layer is less than 5 mm, the strength of the splint may be lowered because the amount of the water-hardenable resin to be impregnated is decreased. If the support layer is more than 15 mm, And adherence to the affected area may be lowered.

The porosity of the support layer may be 20 to 50% by volume. If the porosity of the support layer is less than 20 vol%, the impregnation amount of the water-hardenable resin may be reduced to lower the strength of the splint. If the porosity is more than 50 vol%, the water-hardenable resin may be excessively impregnated.

On the other hand, the supporting layer may be coated and / or impregnated with a water-curable resin. As described above, since the support layer includes an outer layer and an inner layer sandwiched between the outer layers, and the outer layer is interconnected by the inner layer including a plurality of voids, and the support has an integral structure, Can be introduced into the inner layer including a plurality of voids through the regular lattice structure formed in the outer layer of the support layer, and the structure of the inner layer is very irregular, unlike the outer layer, so that the introduced hydraulically hardened resin is prevented from flowing back to the outside .

The hydro hardening resin may be a polyurethane prepolymer, and since the polyurethane prepolymer has a very high strength after curing, it can be inserted into the endothelial layer and the sheath layer to press and fix the affected part.

Generally, polyurethane refers to a polymer produced by a reaction between a compound having a hydroxyl group (-OH) and a compound having an isocyanate group (-NCO). In the present invention, a polymer obtained by a polymerization reaction of a diisocyanate and a polyol mixture .

On the other hand, the term " prepolymer " as used herein means a polymer having a relatively low degree of polymerization, in which the polymerization reaction is stopped at a middle stage so as to facilitate the formation of the final polymer. The synthesis route through the prepolymer can be partially generated in the synthesis of the prepolymer to reduce the heat generation between the polymer syntheses and reduce the toxicity, thereby enhancing the environment friendliness and user's stability of use.

In the urethane bond, the isocyanate group is composed of a hard segment and the polyol group is composed of a soft segment. The higher the ratio of the stiffness structure, the higher the hardness and the greater the stiffness. The higher the ratio is, the lower the hardness and the soft rubber-like structure is formed, and the elongation can be improved due to the tangled structure of the soft structure. Therefore, the isocyanate group and the polyol group can be controlled at appropriate ratios according to the application and purpose to obtain desired properties.

The diisocyanate may be, but is not limited to, methylene diphenyl diisocyanate (MDI) or toluene diisocyanate (TDI).

The methylene diphenyl diisocyanate and the toluene diisocyanate are relatively superior in physical properties and processability to aliphatic diisocyanates such as hexamethylene diisocyanate (HMDI) or isophorone diisocyanate (IPDI) , The mutual cohesion energy is high, which is also excellent in heat resistance. In addition, the storage stability can be improved as compared with a polyurethane prepolymer made of p-phenylene diisocyanate (PPDI) or naphthalene diisocyanate (NDI) having a high melting point.

The polyol mixture may comprise a triol and a diol. Polyols are generally classified into polyether polyols and polyester polyols. The polyether-type polyol is excellent in flexibility, hydrolysis resistance and solvent resistance, and low in cost. On the other hand, the adhesion property to an adherend having low energy is relatively lower than that of the polyester-type polyol, and mechanical properties are insufficient.

The polyester-type polyol has an excellent adhesion property to an adherend having a low energy as compared with a polyether-type polyol, but has a disadvantage that it is low in solvent resistance and expensive, and can be selected and used as needed.

The triol may include a polyether triol block copolymer and a polypropylene glycol triol. Examples of the triol include polyether triol, acrylic triol, The same known triol may be included as needed.

The diol may be selected from the group consisting of polypropylene glycol, ethylene glycol, polyethylene glycol, and a mixture or block copolymer of two or more thereof, preferably polypropylene A mixture containing a glycol, an ethylene glycol, and a polyethylene glycol-polypropylene glycol-polyethylene glycol block copolymer, and may further include a known diol such as polytetramethylene glycol, if necessary.

Particularly, the polypropylene glycol is a substance having a hydroxyl group (-OH) at both terminals of the polypropylene chain, and can be used as a main polymerization raw material of the polyurethane together with polyethylene glycol. Since the polypropylene glycol is remarkably low in toxicity to polyethylene glycol, human health hazards can be reduced and environmental suitability can be improved.

The polyurethane prepolymer may also contain unreacted NCO groups. As used herein, the term " unreacted NCO group " refers to the unreacted, remaining isocyanate group in the polyurethane prepolymer following polymerization of the diisocyanate with the polyol mixture.

The storage stability of the polyurethane prepolymer may be lowered if the unreacted NCO group is less than 10%. If the content of the unreacted NCO group is more than 15% The risk of

Hereinafter, embodiments of the present invention will be described in detail.

Example One

The polyester polymer is melt extruded at 250 ° C in an extruder, spun through a nozzle, and then rolled to produce POY (Partially oriented yarn). The produced POY yarn was stretched in a combustor and subjected to a burning treatment to produce a 500 denier polyester DTY yarn.

The polyester polymer was melt extruded at 250 ° C in an extruder and spun through a nozzle, followed by stretching treatment in a combustor, heat-setting treatment, and then 500 denier polyester SDY yarn was produced.

100 g of the fabricated polyester DTY yarn and 50 g of polyester SDY yarn were weighed by a double lacquer machine into a support layer having a thickness of 10 mm and a porosity of 40% by volume. An orthopedic splint was prepared by inserting a woven base layer between the endothelial layer and the sheath layer.

Example 2

An orthopedic splint was prepared in the same manner as in Example 1, except that the support layer was woven with a mixed yarn of polyester having a denier of 300 denier.

Comparative Example One

An orthopedic splint was prepared in the same manner as in Example 1, except that the support layer was woven with only polyester DTY yarn.

Comparative Example 2

An orthopedic splint was prepared in the same manner as in Example 1 except that the support layer was woven only with polyester SDY yarn.

Comparative Example 3

An orthopedic splint was prepared in the same manner as in Example 1, except that the support layer was woven with a polyester blend yarn of 1000 denier.

Comparative Example 4

An orthopedic splint was prepared in the same manner as in Example 1, except that the thickness of the support layer was 2 mm.

Comparative Example 5

An orthopedic splint was prepared in the same manner as in Example 1, except that the thickness of the support layer was 25 mm.

Comparative Example 6

An orthopedic splint was prepared in the same manner as in Example 1 except that the porosity of the support layer was woven at 10% by volume.

Comparative Example 7

An orthopedic splint was prepared in the same manner as in Example 1, except that the porosity of the support layer was woven at 60% by volume.

Experimental Example : Performance evaluation of splint

division durability Hygroscopic Lightweight Formability Example 1 ◎ ◎ ◎ ◎ Example 2 ◎ ◎ ◎ ◎ Comparative Example 1 ○ △ × × Comparative Example 2 × × ○ △ Comparative Example 3 △ △ × × Comparative Example 4 × × ○ ○ Comparative Example 5 △ △ × × Comparative Example 6 × × △ △ Comparative Example 7 ○ ○ × × - Durability: The tensile strength of the product is measured and evaluated.
- Hygroscopicity: After immersing in water for 10 seconds, measure setting time of product
- Light weight: Comparison between thickness and weight between products
- Formability: When the product is applied to the affected part, the adhesion and ease of use are compared.

(Relative Evaluation Criteria: Excellent, Good, Fair, and Poor)

Referring to Table 1, it was found that the support layer was excellent in all performance evaluations (durability, hygroscopicity, lightweight, and moldability) when the polyester layer was woven using DTY and SDY mixed yarns (Examples 1 and 2). Particularly, it is expected that it will have excellent performance and effect when it is applied to a user 's affected area because it is excellent in moldability and durability which is the most important performance in a splint.

On the other hand, in the case where one type of polyester yarn was used (Comparative Examples 1 and 2), synergism due to mixing did not occur and durability was poor or moldability was poor. Further, in the case where the thickness of the polyester blended yarn was excessively large (Comparative Example 3), the support layer was thick and tired and the cuttability was deteriorated, resulting in poor lightness and moldability. Further, when the thickness of the support layer was too thin or the porosity was low (Comparative Examples 4 and 6), the water-hardenable resin was not impregnated sufficiently, and durability and hygroscopicity were poor.

On the contrary, when the thickness of the support layer was excessively large or the porosity was high (Comparative Examples 5 and 7), it became thicker than necessary, resulting in poor lightness and moldability.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

100: Support layer

Claims

A splint comprising a support layer coated with a hydraulically hardened resin,
Wherein the support layer is made of a mixed yarn including a polyester DTY (Draw Textured Yarn) and a polyester SDY (Spin Drawn Yarn)
Wherein the support layer comprises an outer layer and an inner layer interposed between the outer layers,
Wherein the outer layer is interconnected by the inner layer comprising a plurality of voids such that the support layer has an integral structure.

The method according to claim 1,
Wherein the hydrolyzable resin is a polyurethane prepolymer.

The method according to claim 1,
Wherein the mixed yarn has a thickness of 500 denier or less.

The method according to claim 1,
Wherein the weight ratio of the polyester DTY and the polyester SDY in the mixed yarn is 2: 1 to 1.5, respectively.

The method according to claim 1,
Wherein the thickness of the support layer is 5-15 mm.

The method according to claim 1,
Wherein the porosity of the support layer is 20 to 50% by volume.