KR100266962B1 - Orthopedic casting article - Google Patents

Abstract

The present invention discloses an orthopedic splint that can adhere well to wrinkles, such as elbows or heels, without wrinkles without skilled techniques. The splint for shaping according to the present invention comprises a flexible fabric supporter and a foam member layer bonded to at least one of the upper and lower surfaces of the fabric supporter and impregnated with a porous cell composition in the form of open cell pores. The urethane composition is a catalyst for promoting the curing reaction of the polyurethane prepolymer in the presence of water, based on the total weight of (a) the polyurethane prepolymer, which is the reaction product of the polyol compound and the polyisocyanate compound, and (b) the water-curable polyurethane composition. 0.5 to 2% by weight of the compound (c) It is characterized in that it comprises 0.005 to 1.0% by weight of a stabilizer for preventing premature curing reaction of the polyurethane prepolymer, based on the total weight of the water-curable polyurethane composition.

Description

Orthopedic castings {Orthopedic casting article}

The present invention relates to an orthopedic splint, and more particularly, to an orthopedic casting article which is excellent in adhesion to an adherend and convenient to be applied to a curved body part.

Traditional plaster bandages, made by impregnating fabrics with loosely woven fabrics such as gauze, are used in flexible supports such as fiberglass fabrics due to problems such as inconvenience in use. It is being replaced by an orthopedic splint made by impregnating a urethane composition.

That is, most currently available orthopedic splints are made by coating and / or impregnating a hydrocurable polyurethane resin on a support made of glass fiber fabrics, polyester fabrics, or other synthetic or natural fiber fabrics. For example, shaping splints using polyisocyanate prepolymers that react with water to cure to polyurethane are disclosed in US Pat. No. 4,411,262 and US Pat. No. 4,502,479. Generally, the polyisocyanate prepolymers are polymerized into polyurethane urea upon contact with water as a reaction product of isocyanate compounds and polyols. When the orthopedic splint is used in a patient, first, before applying to a specific surgical site of the patient's body, the orthopedic splint treated with the prepolymer is moistened with water, and then unnecessary excess water is removed and then applied to the surgical site. At this time, the practitioner applies the splint to the patient's surgical site with a gloveed hand. During this procedure, the splint surface becomes relatively smooth and then remains in a predetermined shape until hardened.

In the orthopedic splint, the support is difficult to be closely adhered to the shape of the body part because it is generally made by laminating a plurality of fabrics in order to achieve the desired strength and rigidity. Therefore, when the orthopedic splint is applied to a severely curved area such as an elbow, a heel, or the like, the orthopedic splint must be folded or wrinkled inevitably. However, when the orthopedic splint hardens in a state in which it is not closely adhered to according to the shape of the body part, the appearance is not beautiful from the aesthetic point of view, and the strength and stiffness are not sufficiently exerted, so the stability of the body part is not sufficiently secured. . In addition, the orthopedic splint requires a skilled technique to uniformly and well-fit the body.

Therefore, the technical problem to be achieved by the present invention, in order to solve the above problems can be well adhered even when applied to the bent areas such as elbows, heels, orthopedic splint that can be easily performed without skilled skills To provide.

In order to achieve the above object, the present invention is a flexible fabric support; And a foam member layer bonded to at least one of the upper and lower surfaces of the fabric support and having the open cell type pores impregnated with the hydrocurable polyurethane composition, wherein the hydrocurable polyurethane composition comprises (a) a polyol compound and a polyisocyanate compound. 0.5-2% by weight of a catalytic compound which promotes the curing reaction of the polyurethane prepolymer in the presence of water, based on the total weight of the polyurethane prepolymer, which is a reaction product, and (b) the water-curable polyurethane composition. Based on the total weight of the polyurethane composition, provides an orthopedic splint comprising a 0.005 to 1.0% by weight stabilizer for preventing premature curing reaction of the polyurethane prepolymer.

In the present invention, the foam member layer is preferably bonded to both the upper and lower surfaces of the fabric support.

In the present invention, the foam member layer has a thickness of 1 to 5mm, an apparent density of 0.01 to 0.05g / cm ³ is preferably made of a polyurethane material.

In the present invention, the weight of the water-curable polyurethane resin composition impregnated in the foam member layer is preferably 2 to 20 times the weight of the foam member layer.

In the present invention, the textile support is preferably at least one selected from the group consisting of glass fiber knitted fabrics, polyester fiber knitted fabrics, and cellulose fiber yarn knitted fabrics.

In the present invention, the catalyst compound of the above (b) is preferably diethylene triamine.

In the present invention, the stabilizer of (c) is preferably phosphoric acid (H ₃ PO ₄ ).

Hereinafter, the present invention will be described in more detail.

The orthopedic splint of the present invention includes a foam member layer bonded to at least one of the upper and lower surfaces of the flexible fabric support and the fabric support, preferably both of the upper and lower surfaces. The inside of the foam member layer has many pores in the form of an open cell, and in the pores, (a) a polyurethane prepolymer which is a reaction product of a polyol compound and a polyisocyanate compound, and (b) the polyurethane prepolymer in the presence of water. Catalyst compound for promoting the curing reaction of (c) A water-curable polyurethane resin composition containing a stabilizer for preventing premature curing reaction of the polyurethane prepolymer is impregnated. The content of the catalyst compound and the stabilizer is 0.5 to 2% by weight, 0.005 to 1.0% by weight, respectively, based on the total weight of the water-curable polyurethane composition.

In the present invention, the foam member layer is preferably bonded to both the upper and lower surfaces of the fabric support. Therefore, according to a preferred aspect of the present invention, in the splint for shaping of the present invention, the foam member is bonded to the upper and lower surfaces of a fabric support such as a glass fiber knitted fabric, so that the cross-sectional shape is sandwiched. The bonding is not particularly limited in the method, for example, by an adhesive method, sewing, or flame bonding with an adhesive.

The interior of the foam member layer is formed of many pores in the form of an open cell, wherein the "open cell" is a lot of fine pores are connected to each other through a fine hole can be impregnated with a sufficient amount of resin to produce a splint, and It refers to a porous structure that allows moisture and air to pass through to promote a reaction and prevent skin masceration to enable comfortable wearing. The foam member layer has a thickness of 1 to 5 mm, an apparent density of 0.01 to 0.05 g / cm ^3, and is made of polyester polyurethane foam or polyether polyurethane foam.

Preferably, the foam member layer has a thickness of 1 to 5 mm. If the thickness is less than 1 mm, a sufficient amount of the polyurethane resin composition is difficult to be impregnated, so that sufficient strength cannot be exhibited after curing. It is not preferable because the patient senses fever during curing of the resin because it does not adhere well to the affected area and the appearance is not good and the degree of isolation increases.

The water-curable polyurethane resin composition to be used in the present invention is a (a) polyurethane prepolymer (b) a catalytic compound for promoting the curing reaction of the polyurethane prepolymer (c) a stabilizer for preventing premature curing reaction of the polyurethane prepolymer Include.

The polyurethane prepolymer is a reaction product of a polyisocyanate with a polyol, and a hydrocurable isocyanate terminated polyurethane prepolymer having a ratio of an isocyanate group (NCO) in a polyisocyanate and a hydroxyl group (OH) in a polyol of about 2: 1 to about 3.5: 1 desirable. Examples of suitable polyol compounds include polyether polyols such as polyethylene glycol, polypropylene glycol, and polytetramethylene glycol, which are ring-opening polymers of alkylene oxides such as ethylene oxide, propylene oxide and tetrahydrofuran, and adipic acid and phthalic acid. And polyester-based polyols which are dehydration polycondensation products of dibasic acids and glycols such as ethylene glycol, propylene glycol and 1,4-butanediol.

 The said polyol compound can be used individually or in combination of 2 or more types as needed.

As the polyisocyanate compound reacting with the polyol compound, many kinds of known polyisocyanate compounds may be used without limitation. Examples of suitable polyisocyanates include 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, 1,4-phenyl Aromatic polyisocyanate compounds such as lene diisocyanate and the like and aliphatic polyisocyanate compounds such as hexamethylene diisocyanate. The said polyisocyanate compound can be used individually or in combination of 2 or more types as needed.

The polyurethane prepolymer used in the present invention may be obtained by reacting a mixture of the polyol compound and the polyisocyanate compound for 1 to 10 hours while stirring at a temperature of 30 to 120 ° C. In order for the terminal group of the polyurethane prepolymer to be an isocyanate group, the mixing ratio of the polyisocyanate compound and the polyol compound should be 1.2 to 10 moles, preferably 2.5 to 5 moles, for each mole of hydroxyl group of the polyol compound. do.

As the catalyst compound of (b), an amine compound, a morpholine compound, or the like may be used. As the amine compound catalyst, diethylene triamine, hexamethylene diamine, and the like, as the morpholine compound catalyst, dimorpholino diethyl ether, bis (2,6-dimethylmorpholino) diethyl ether, bis [2- (4 -Morpholino) propyl] ether, bis [2- {4- (2,6-dimethylmorpholino)} propyl] ether, and the like. In addition, a metal catalyst such as dibutyltindilaurate may be used. The amount of the catalyst compound in the hydrocurable polyurethane prepolymer composition is 0.1 to 3.0% by weight based on the total weight of the resin composition.

As a stabilizer for preventing premature curing reaction of the polyurethane prepolymer of (c), phosphoric acid (H ₃ PO ₄ ) is used in 0.005 ~ 1.0% by weight based on the total weight of the water-curable polyurethane composition.

The stabilizer acts to prevent premature curing reaction of the polyurethane prepolymer stored in the substantially absence of water, if the amount is less than 0.005% by weight can not obtain a stabilization effect, the amount of the stabilizer is 1.0% If it exceeds%, there is a problem that the curing reaction time of the polyurethane prepolymer is excessively long.

The water-curable polyurethane resin composition may be prepared by uniformly blending the components, namely (a) polyurethane prepolymer (b) catalyst compound and (c) stabilizer. The resin composition may also contain other known additives, namely antifoaming agents, antioxidants, UV absorbers, surfactants, colorants such as dyes or pigments, calcium carbonates to minimize foaming by carbon dioxide that occurs when the isocyanate groups and the moisture are cured. And fillers such as titanium dioxide, carbon black, and clay.

The viscosity of the polyurethane resin composition is 10,000 to 50,000 cps, preferably 20,000 to 50,000 cps at room temperature.

The strength and elasticity of the cured splint is determined by the amount of cured polyurethane resin composition and the thickness and number of the fabric support rather than the open cell foam member, among which the amount of cured polyurethane resin composition. That is, in the present invention, the strength and elasticity of the cured splint is mainly determined by the amount of the water-curable polyurethane resin composition impregnated in the foam member, which depends on the part of the body where the splint is to be used. It is preferable that it is -20 times. If the weight of the polyurethane resin composition is less than 2 times, the strength cannot be exhibited sufficiently, and if the weight of the polyurethane resin composition is more than 20 times, the orthopedic splint may be too heavy, and excessive heat of hardening may occur, causing burns to the patient.

For example, when used in the arm, the resin composition with respect to the weight of the foam member layer of 80 to 93g with respect to the weight of 7 to 20g of the foam member layer, and when used for the legs with respect to the weight of the foam member layer 5 to 10g 90 to 95 g of the resin composition when used for lumbar fixation, the resin composition 84 to 93 g for the foam member layer 7 to 16 g, and the resin composition 70 to 80 g for the foam member layer 20 to 30 g when used for the purpose of women's bra When used as a sports bottom, it is preferable to use in the ratio of 90-95 g of resin compositions with respect to 5-10 g of foam member layers.

In the present invention, the textile support is preferably at least one selected from the group consisting of glass fiber knitted fabrics, polyester fiber knitted fabrics, and cellulose fiber yarn knitted fabrics.

The fabric support used in the present invention is flexible and should have an elongation of at least about 10% in at least one direction. In addition, the fabric support must have a suitable thickness and porosity so that the surface is smooth and water and air can pass easily.

Orthopedic splints according to the present invention can be prepared by the following method. First, two pieces of foam members are cut into a desired shape, and then, the polyester knit fabric is cut into a suitable length between the two pieces and sewn with a sewing machine to be bonded. Subsequently, it is soaked for 5 to 10 seconds in a barrel containing the water-curable polyurethane resin composition and then taken out. Subsequently, the excess polyurethane resin composition is removed using a squeezer roller to adjust the amount of the resin composition impregnated in the foam member and the fabric support according to the application (depending on the body part applied). The splint for shaping with the resin composition impregnated in this way is stored in a container capable of blocking contact with air containing moisture.

Next, a brief description will be given of a method of using the shaping splint according to the present invention, for example, in a forearm.

First, the splint for shaping according to the present invention is taken out of the container and brought into contact with water to initiate the curing reaction of the resin, and the excess water is pressed and removed by hand, and then placed on the lower stomach wound with a stockinet or elastic bandage. Place the orthopedic splint as appropriate. Next, the splint is properly fixed when the resin is cured by appropriately trimming the orthopedic splint and winding elastic bandages or other fixing means around the splint and the lower circumference so that the splint is properly fixed.

Besides Habak, the orthopedic splint of the present invention can be applied to any part of the body. For example, the splint for shaping according to the present invention may be fixed to the upper arm, upper leg, or lower leg. On the other hand, the splint for shaping according to the present invention is removed from the container for blocking the air and placed in accordance with the site to be treated, and then cured by the procedure, in addition to hardening in advance in the appropriate shape on each part of the body manufactured in three-dimensional splint In one state, it can be trimmed to fit the size of the body part of the patient. According to the latter method, since the time required for the curing reaction of the polyurethane prepolymer can be omitted when performing the procedure to the patient there is an advantage that the procedure can be completed quickly. In addition, the orthopedic splint according to the present invention can also be used as lumbar support, women's bras, sports bands.

Hereinafter, the present invention will be described in more detail with reference to the following examples, which are intended to be illustrative only and the present invention is not limited thereto.

 Example 1

Hydrocurable polyurethane prepolymer compositions were prepared by the following method. That is, stirring 41 parts by weight of polypropylene glycol having an average molecular weight of 2,000 (Kumho Chemical, H-2000D) and 55 parts by weight of 4,4'-diphenylmethane diisocyanate (Dow Chemical, I-125MK) for 30 to 40 minutes After mixing, 0.5 parts by weight of phosphoric acid was added as a stabilizer. Subsequently, the mixture was reacted at 60 ° C. for 1 hour, and then heated to 80 to 85 ° C. for about 3 hours. Subsequently, 2.0 parts by weight of polyoxyethylene nonyl phenyl ether (BASF, F-108) as a nonionic surfactant, 0.1 part by weight of a silicone liquid (US AG, SAG-1000) as an antifoaming agent, and diethyl triamine as a curing catalyst. 1.0 parts by weight (Nitrol Europe, PC-CAT10) and 0.4 parts by weight of cyan green dye (Songwon Color, Blue-1000) were added and reacted for about 1 hour.

The viscosity of the water-curable resin composition thus obtained was 35,000 cps as measured by rotating a No. 4 rotor at a speed of 12 using a rotational viscometer at 25 ° C.

 Example 2

A forearm splint was prepared using the water-curable polyurethane resin composition prepared in Example 1 according to the following method. In other words, the thickness is 2.0mm, the apparent density is 0.024g / cm ³ , and the suitable shape so that the polyurethane foam member (customized by Seoul Sponge Co., Ltd.) which is 2.1kgf / cm ² in both the horizontal and the longitudinal direction is 2.1g. Foundation was cut. Between two pieces of foam members thus cut (that is, 110 g in total), a 0.25 mm thick polyester knitted fabric (Songwon Industry) was cut into suitable lengths, sandwiched about 40 g, and sewn with sewing material to complete the intermediate of the orthopedic splint.

Subsequently, after immersing the intermediate of the shaping splint in the barrel containing the resin composition of Example 1, the impregnation amount of the resin composition was adjusted to about 850 g by using a compression roller to complete the splinting material for Habakku shaping. Subsequently, after dipping the orthopedic splint in water at 21 to 24 ° C. three to four times, the water was sufficiently taken out and squeezed out. Subsequently, the orthopedic splint was placed on a good absorbent towel to press and remove the remaining water.

Subsequently, the orthopedic splint is properly positioned on the lower butt wound or unwound with an elastic bandage, fixed within 3 to 4 minutes to the shape of the patient's lower arm, and the trimmed splint is properly trimmed. Stretch bandages around wood and habak ensured proper fixing of the orthopedic cast as the resin cured. The procedure for Habakku splints was well adhered to the elbow without folding and was well ventilated, resulting in a satisfactory fit and appearance from 41 of 45 patients.

 Example 3

The polyurethane foam member of Example 2 was cut into a suitable shape such that it was about 30 g. Between two pieces of foam members thus cut (ie, 60 g in total), the polyester knitted fabric of Example 2 was cut to a suitable length, sandwiched about 40 g, and sewn with sewing material to complete the intermediate of the orthopedic splint.

Subsequently, the intermediate of the shaping splint is immersed in a barrel containing the resin composition of Example 1, and then adjusted to have an impregnation amount of the resin composition of about 900 g using a compression roller to complete the lower shaping splint according to the present invention. It was.

Subsequently, the procedure was performed on the lower leg of the patient in the same manner as in Example 2. The procedure for Habakku splints was well adhered to the heel without being folded and was well ventilated, resulting in a satisfactory fit and appearance from 40 of 45 patients.

As described above, the orthopedic splint according to the present invention is composed of a porous foam member having a major component of the support having excellent adhesion and form stability. That is, the orthopedic splint according to the present invention uses a foam member having a soft and flexible, so that it can be fixed in any form to the curved part because it is hardened in a state of being closely adhered to the shape of the procedure without wrinkles or folding. Therefore, by using the orthopedic splint according to the present invention, it is possible to maintain and fix the adherend in a desired form, and to be able to adhere well to wrinkled areas such as elbows or heels without wrinkles, and thus without skilled skills. It can be easily performed.

Claims (3)

Flexible fabric support; And Bonded to at least one side of the upper and lower surfaces of the fabric support, the thickness is 1 ~ 5mm, the apparent density is 0.01 ~ 0.05g / cm ³ and made of a polyurethane material, the water-curable polyurethane composition in the pores of the open cell form An impregnated foam member layer, The hydrocurable polyurethane composition is a curing reaction of the polyurethane prepolymer in the presence of water, based on the total weight of (a) a polyurethane prepolymer that is a reaction product of a polyol compound and a polyisocyanate compound, and (b) the hydrocurable polyurethane composition. 0.5 to 2% by weight of the catalyst compound for promoting the (c) and 0.005 to 1.0% by weight of a stabilizer for preventing premature curing reaction of the polyurethane prepolymer, based on the total weight of the water-curable polyurethane composition Orthopedic splint. The method of claim 1, wherein the foam member layer, Orthopedic splint, characterized in that bonded to both the upper and lower surfaces of the fabric support. The splint of claim 1, wherein the weight of the water-curable polyurethane resin composition impregnated in the foam member layer is 2 to 20 times the weight of the foam member layer.