WO2016006848A1 - Thermoplastic cast with excellent transformability and rigidity. - Google Patents

Abstract

The present invention relates to a thermoplastic cast which is reusable. The cast according to the present invention comprises: a structure (10) made of a polycaprolactone composite and having a net shape in which polygonal apertures are repeatedly formed; and an outer cover (20) attached to the external circumferential surface of the structure (10), wherein the melting point of the polycaprolactone composite forming the structure (10) is 50 to 80°C, and wherein the outer cover (20) is made of a rubber material or silicone having a shore D hardness of 2 to 35. Due to this configuration, the cast according to the present invention is, while structurally robust, simple in procedure and suitable for mass production.

Description

Highly deformable and rigid thermoplastic cast

The present invention relates to a thermoplastic cast having excellent deformability and rigidity. More specifically, the present invention relates to a thermoplastic cast having a deformability and rigidity. A thermoplastic cast having excellent rigidity.

In general, if a joint or limb is fractured or damaged, the damaged joint, limb or spine is fixed using a cast, cast, sprinter, or corrective tool (brace), etc., so that a smooth treatment can be performed. do.

Conventionally, in order to fix such damaged joints or limbs, casts are generally installed on the affected areas using bandages and plasters, but these plasters are not only heavy but also cannot be remolded once solidified and deteriorated when exposed to moisture. It is difficult for a patient to bathe or shower because it is damaged or damaged, and air is not easily passed to the part where the cast is installed.

For the same reason, casts have been recently developed that are not damaged even when bathed or showered, and that air is easily distributed. As an example, a cast disclosed in US Patent No. 6,673,029 may be used. As shown in FIGS. 1A and 1B, the cast is made of a mesh shape having a relatively large size of the eye 120, in which the material forming the mesh shape has sufficient strength to firmly support and protect the body part. The resin-impregnated fiberglass fiber 110 is laminated in 6-12 layers to form a plate shape, and then the plate-shaped material is cut to form an hexagonal mesh array of eyes. , Reticular) is not only difficult to laminate the resin impregnated fiberglass fiber 110 in multiple layers, but also as described above When the impregnated fiberglass fiber 110 is laminated in several layers, the surface of the fiber layer is not smooth due to the unevenness of the impregnation during the resin impregnation process, so that the cast 100 made of such a smooth surface is worn. Thereby, there is a disadvantage that the patient may feel uncomfortable.

In order to manufacture the cast 100 in the form of a reticular body, the patent first uses a fiberglass fiber 110 to make a cloth, and then cuts a diamond shape from the cloth to make an eye, thereby making the fiberglass fiber 110 ) Can be loosened, and in this case, the strength of the cast 100 may be weakened, and when the resin is impregnated in the loosened all-parts, this part becomes sharp and may irritate the user's skin.

Moreover, since the cast 100 is manufactured by impregnating with a water-curable resin, contact with water or moisture should be prevented in the manufacturing process, and thus, when the cast is manufactured, productivity is low because the cast 100 should be made in a closed space from which moisture or moisture is removed. Since the contact with moisture must be blocked even after manufacture, the manufactured cast must be sealed and stored.Therefore, there is a problem in manufacturing management and cost, and once it is cured, it cannot be used again. Even if it is necessary to modify 100, there is a problem that it is difficult to modify and reuse the cast 100.

In order to solve the problems of the above water-curable cast, a cast made of a thermoplastic network has been developed, and one example thereof includes the thermoplastic cast disclosed in US Patent Application Publication No. 2008-0154164.

The cast disclosed in U.S. Patent Application Publication No. 2008-0154164 discloses a plurality of casts therebetween by forming the sprint member 210 of the cast 200 into a mesh having an approximately diamond-shaped opening, as shown in FIGS. 2A and 2B. Four rhombus-shaped passages 220 are formed, wherein the material of the sprint member 210 is a polycaprolactone composite material that can be formed at a low temperature so as to have sufficient strength to firmly support and protect a body part. A material in which additives such as lignocellulosic is mixed is used for the formed base material, and the 'extension' in the longitudinal direction of the side is limited by such a structure and the used material, but it is easily stretched in a direction parallel to the directions of axis 1 and axis 3. The shape of the rhombus formed on the network according to the appearance of the body can be easily deformed (hereinafter, referred to as 'deformation'). It is distinguished from 'height', which means that the length of the mutation increases.)

However, the cast disclosed in the patent document is easy to deform, so that the procedure to the patient's body is relatively easy, but the entire cross section of the mesh-shaped sprint member 210 is formed by a polycaprolactone composite material to which lignocellulose is added. Therefore, the strength is relatively weak, and because of the softness of the material is not limited to the elongation in the longitudinal direction of the side is increased to some extent, in this case the thickness of the side is reduced, thereby weakening the cast strength There are disadvantages.

On the other hand, when using a cast made of such a material, first, an underlying padding or skin protector having a relatively small eye size is installed around the affected part to protect the skin of the patient. In the state where plasticity is maintained by heating a web-shaped cast having a relatively large eye size on the upper part of the pad, it is formed by surrounding the affected part and fixing it with a clip or the like. In the case where the lower pad is installed below the cast, If the ventilation is not smooth, and the lower pad gets wet due to the shower, the user may feel uncomfortable because moisture may remain on the lower pad for a long time.

In addition, when the lower pad is additionally installed in the lower part of the cast as described above, the lower pad may not be freely flown due to the contact between the upper cast and the lower pad, which may be uncomfortable. The lower pad should be replaced occasionally because it is shorter than the period. In this case, it is difficult and inconvenient to replace the lower pad by first melting the cast and then replacing the lower pad and forming the cast again.

Another example of a cast using a thermoplastic material is an orthopedic fixation material (cast) using the resin composition disclosed in Korean Patent Application Publication No. 10-2005-74734. The cast disclosed in this document includes polycaprolactone and thermoplastic polyurethane. And it is manufactured by injection molding using a material in which the filler is mixed at a specific ratio, the cast can be excessively elongated during the procedure because the cast is mainly made of polycaprolactone and polyurethane, which is relatively weak in strength. Not only can it be deformed after the procedure, but because the cast consists only of a polycaprolactone composite layer, the cast can be stretched excessively during the procedure, and the surface of the cast is hard to the patient's skin. Contact may cause discomfort.

Therefore, when the cast is applied to the patient's body part, the stretch in the longitudinal direction of the side can be limited, so that the strength of the cast can be maintained and the rhombus-shaped eye can be easily deformed according to the shape of the patient's body part. It is necessary to develop a cast made of a material which can be easily processed and prevents excessive deformation and can be mass-produced.

The present invention has been devised to solve the problems of the cast of the mesh shape made of a conventional thermoplastic material as described above, having sufficient strength and excellent deformability, and does not feel inconvenience for the user when worn, mass production The aim is to provide a thermoplastic cast with good deformability and rigidity.

An object of the present invention as described above is made of a polycaprolactone composite cast, the structure having a mesh shape by repeatedly opening the polygonal shape; The melting point of the polycaprolactone composite material constituting the structure, the outer surface of the structure consists of a rubber material or silicone having a Shore D hardness in the range of 2 ~ 35 range Is achieved.

At this time, the mesh-like structure is molded by injection molding or compression molding (press), it is preferable that the outer skin attached to the outer peripheral surface of the structure is molded by insert injection in which the injection molding is made with the structure installed in the mold.

In addition, the polycaprolactone composite constituting the structure preferably includes polycaprolactone having a molecular weight in the range of 20,000 to 80,000.

The polycaprolactone composite is preferably one or more synthetic resins of polyethylene, polypropylene, polybutene, polyurethane, and polyethylene phthalate by blending.

In addition, the polycaprolactone composite material is mixed with strength reinforcement made of glass fiber or carbon fiber, and the strength reinforcement material is more preferably mixed with 10 to 60% by weight based on the caprolactone composite.

And it is more preferable to add one or more nucleating agents of calcium carbonate, talc, sodium benzoate, MBS, DMBS and DEBS to the polycaprolactone composite.

The present invention improves breathability because the cast has a net shape.

In addition, the present invention is made of a polycaprolactone composite with reinforced structure, the soft outer shell wraps the structure to serve as a reinforcement and deformation limiting element for the structure to facilitate the cast procedure to the affected area Adequate strength is ensured.

In the present invention, since the material for forming the structure and the shell is made of a material suitable for injection molding, mass production by double injection is possible.

In addition, the present invention does not feel uncomfortable even when the cast (surface) is in contact with the skin of the patient because the outer shell made of a relatively soft material surrounds the outer peripheral surface of the rigid structure.

1A and 1B show an example of a conventional cast,

2a and 2b show another example of a conventional cast,

3 is a cross-sectional view showing the cross-sectional shape of the thermoplastic cast according to the present invention;

4 is an external view of a thermoplastic cast according to the present invention.

<Description of the code>

1: cast 10: structures

20: shell

Hereinafter, the configuration and operation of the present invention through the accompanying drawings showing a preferred embodiment in more detail.

The present invention relates to a composition of a thermoplastic cast used to wrap around, fix or correct a fracture site of a patient, the cast according to the present invention having a structure 10 and an outer circumferential surface of the structure 10 as shown in FIG. It consists of a shell 20 surrounding the structure, wherein the structure 10 is manufactured by injection molding or compression molding, the shell 20 is manufactured by injection molding.

Structure 10 has a net shape by the regular opening of the polygonal shape, wherein the cross section of the side forming the net shape has a rectangular shape that is relatively higher in height than the width to ensure sufficient rigidity against external force or impact Molded to have such a structure 10 is made of a polycaprolactone composite based on polycaprolactone (PCL, polycaprolactone).

Polycaprolactone is used as a main material of the polycaprolactone composite constituting the structure 10. The polycaprolactone used in the present invention is a kind of polyester produced by ring-opening polymerization of caprolactone, and is a crystalline polymer. It has a low melting point of ˜80 ° C.

In addition, the polycaprolactone (PCL) used in the present invention has a molecular weight in the range of 20,000 to 80,000, which is the mechanical properties (impact strength) as shown in Table 1 below when the molecular weight of polycaprolactone is less than 20,000 Since it is low, it cannot be expected to serve as a structure, and therefore, it is preferable to use one having a large molecular weight. However, when the molecular weight is larger than 80,000, the flexural strength and flowability become worse, which is unsuitable as a material for injection molding. will be.

In addition, the melting point of the polycaprolactone under the above conditions is in the range of about 50 ~ 80 ℃, whereby the cast on the affected area can be easily performed.

However, when the structure 10 is made of only polycaprolactone as described above, the mechanical properties, in particular, the tensile strength is so low that it is difficult to use as a cast for supporting the affected part, and accordingly, in the present invention, mechanical properties such as tensile strength A strength reinforcing material is added to the main material (polycaprolactone) to be improved, and as such strength reinforcing material, fiber reinforced glass fiber or carbon fiber is used.

The nucleating agent is added to the structure 10, and the nucleating agent raises the crystallization temperature of the crystalline polymer and accelerates the growth rate of the crystal without affecting the melting temperature. carbonate), DMBS (Di-p-methylbenzylidene sorbitol), DEBS (N, N'-Diphenyl-2,2'-Diselenodibenzoamide Di-p-ethylbenzylidene sorbitol), MBS (monobenzylidene sorbitol), talc (talc), sodium benzoate (Sodium Benzoate) and the like can be used.

When the cast is applied to the affected part of the patient, the cast is first put in hot water or heated by a heater to soften the cast, and then the cast is deformed according to the appearance of the body. In the case of manufacturing the cast using only (10), not only the structure 10 may be excessively stretched, but may also be uncomfortable when the surface of the structure 10 is hard to come into contact with the patient's skin.

Accordingly, the cast of the present invention has a structure in which the outer shell 20 is molded and attached to the outer circumferential surface of the structure 10, and the outer shell 20 wraps the molten structure 10 to prevent excessive elongation of the structure to form a net shape. A cushioning material that maintains the shape of the rectangular shape as it is, and at the same time prevents the thickness from being thinned, thereby reducing the strength, and also prevents the hard surface of the structure 10 from directly contacting the patient's skin. Function as.

In order for the outer shell 20 to have a function as described above, that is, the structure 10 is excessively elongated and consequently thin, resulting in a decrease in strength, the outer shell 20 must have an appropriate thickness and an appropriate strength. In order to function as it should have elasticity, for this purpose, the outer shell 20 is preferably made of a rubber material of the hardness Shore D 2 ~ 35 range, more preferably made of a rubber material of the Shore D 2 ~ 30 range.

Meanwhile, the cast according to the present invention is molded by injection molding to enable mass production, and then the outer shell 20 is also molded by injection molding, that is, by double injection, to cover the outer circumferential surface of the structure 10. do.

In order to manufacture the cast by double injection as described above, the material of the structure 10 and the outer shell 20 should have suitable physical properties. For this purpose, the inventors have investigated the proper physical properties through experiments, and in the following, Describe.

First, in relation to the function of the structure, the structure 10 is located inside the outer shell 20 and should be excellent in formability when heated to an appropriate temperature (about 70 ~ 80 ℃) to be installed in the affected part of the patient When installed in the affected part, it must have strength to be able to withstand external impact or external force, and also have good flowability in order to be suitable for manufacturing (injection molding).

Accordingly, the flow and mechanical strength of the polycaprolactone (PCL), which is the main body of the structure 10, were tested. The results as shown in Table 1 below were obtained.

Tensile strength in the test was measured by UTM (Universal Testing Machine) in accordance with ASTM D638 of the American Society for Testing and Materials (ASTM) measurement method, modulus was measured by UTM in accordance with ASTM D 790, impact strength is ASTM D256 Based on the Izod Notch impact strength was measured at room temperature (23 ℃). In addition, the melting point was measured by DSC (differential scanning calorimeter, differential scanning calorimeter) according to ASTM D3418 at a temperature of 10 ℃ / min at elevated temperature, melting index (MI, melting index) according to ASTM D 1238, melting temperature 130 ℃, The load was measured at 2.16kg, and the spiral flow was injected at a resin melting temperature of 130 ° C., injection pressure of 50%, and mold cooling temperature of 15 ° C. using a 90 ton injection molding machine to measure the length of the injection molded product.

The shrinkage ratio was injected under conditions of a resin melting temperature of 130 ° C., injection pressure of 50%, mold cooling temperature of 15 ° C., and cooling time of 130 seconds using a 90-ton injection molding machine. Then, the specimen was annealed in a constant temperature and humidity chamber for 48 hours, and then The value of (mold display length-specimen display length) ㆇ mold display length ㅧ 100 was calculated by measuring the marked length and the marked length in the injection molded product.

Molecular Weight			13,000	20,000	35,000	50,000	80,000	100,000
The tensile strength		kg f / ㎠	183	182	178	160	145	134
modulus		kg f / ㎠	6,330	6,141	5,267	4,887	4,315	3,892
Impact strength		kg f / ㎠	2	3	7	8	8	10
liquidity	Spiral flow	Cm	125	95	59	36	19	7
	MI	g / 10min	430	135	54	12	3	0.5
Melting point		℃	62	62	62	62	62	61

As can be seen from the above Table 1 (flow rate and mechanical strength test results by molecular weight of polycaprolactone), the melting point of polycaprolactone in the range of molecular weight of 13,000 ~ 100,000 is almost the same as 62 ℃, the higher the molecular weight impact Although the strength is improved, the flexural strength (modulus) and flowability (fluidity) are lowered, and sufficient strength is not secured enough to function as a structure to ensure the structural integrity of the cast.

In order to secure sufficient strength of the structure 10, the present inventors injection molded the structure by mixing a mixture of glass fiber (GF) and carbon fiber (carbon fiber, CF) to polycaprolactone having a molecular weight of 35,000 After molding by each, the strength and shrinkage of the structure 10 according to the mixing ratio of glass fiber and carbon fiber was measured, and the results are shown in Table 2 and Table 3 below.

GF mixing rate		weight%	0	10	20	30	50	60	70
The tensile strength		kg f / ㎠	175	312	345	378	395	412	395
modulus		kg f / ㎠	5,199	13,890	18,324	23,527	28,873	32,580	34,147
Impact strength		kg f / ㎠	6.8	11.2	13.5	14.2	14.3	13.7	7.6
Shrinkage		%	1.5	0.8	0.8	0.7	0.6	0.5	0.5
liquidity	Spiral flow	Cm	59	52	46	41	34	27	14
	MI	g / 10min	54	42	37	31	24	18	2

In Table 2 (mechanical strength test results according to the mixing ratio of glass fibers), the average length of the glass fiber was 4mm, and as the mixing ratio of glass fibers increases, mechanical properties such as tensile strength increase rapidly and shrinkage decreases. When the content of glass fiber exceeds 60% by weight, the mechanical properties are excellent, but the fluidity becomes poor, so it is suitable as the material for injection molding because smooth processing can be achieved by increasing the processing temperature by 10 ~ 20 ℃. Therefore, when about 10 to 60% by weight of glass fiber is included in the polycaprolactone (PCL), it can be seen that the mechanical strength and shrinkage rate required for the structure 10 are secured and the physical properties suitable for injection molding are secured. .

CF mixing rate		weight%	0	10	20	30	50	60	70
The tensile strength		kg f / ㎠	175	324	335	391	437	455	462
modulus		kg f / ㎠	5,199	15,524	20,127	27,598	33,251	37,748	39,320
Impact strength		kg f / ㎠	6.8	13.5	17.6	20.2	22.4	21.2	21.8
Shrinkage		%	1.5	0.7	0.6	0.6	0.5	0.5	0.5
liquidity	Spiral flow	Cm	59	53	48	45	36	28	17
	MI	g / 10min	54	45	38	33	25	21	6

Table 3 (mechanical strength test results of the structure according to the mixing ratio of carbon fibers) shows the change in the mechanical properties of the structure according to the mixing ratio in the case of mixing carbon fiber having an average length of 6mm to caprolactone (PCL) The results show that as the mixing ratio of carbon fiber increases, as in glass fiber, mechanical properties such as tensile strength increase rapidly and shrinkage decreases. In particular, when carbon fiber is used as a strength reinforcing material, glass having the same content It can be seen that the mechanical strength is increased by about 10% than when using the fiber.

In addition, when the content of carbon fiber in the structure 10 exceeds 60% by weight, the mechanical properties are excellent, but the fluidity is poor, so it is not suitable as a material for injection molding, and thus, about 10 to 60% by weight of carbon fiber is contained in the caprolactone composite. When included, the mechanical strength and shrinkage rate required for the structure are secured and the physical properties suitable for injection molding are secured.

And the cast material of the present invention may include a nucleating agent to promote the crystal growth rate of the crystalline polymer caprolactone, in the case of using such a nucleating agent melted structure raw material (polymer) in the mold during the actual injection molding operation When cooled, crystallization occurs from a high temperature, and as a result, the polymer solidifies quickly, so that the cooling time can be shortened and the molding time can be shortened. The present inventors have described the crystallization temperature and cooling time according to the type of nucleating agent. In order to investigate, the cross-sectional shape was 3 mm in width, using a polymer containing one kind of nucleating agent mixed with a polymer containing 30 wt% of polycaprolactone having a molecular weight of 35,000 and glass fiber having an average length of 4 mm while changing the type of nucleating agent. It is made of a rectangle of 4mm in height, and the molded shape is a net-shaped structure 10, and then the nucleus species The crystallization temperature, cooling time and fluidity were tested according to the test results. And talc were each mixed at a ratio of 1 wt% based on polycaprolactone, and sodium benzoate, MBS, DMBS and DEBS were mixed at a ratio of 0.1 wt% based on polycaprolactone, respectively.

In the experiment, the crystallization temperature was measured by differential scanning calorimeter (DSC) according to ASTM D3418, and the solidification time was a method of predicting the molding work time. The time until after work was possible was measured, and the time measurement was performed by five gypsum yarns who had cast treatment experience to test each specimen five times, and then calculated the average time.

In addition, the mold cooling time was measured using a 90-ton injection molding machine to measure the minimum cooling time after the specimen was removed from the mold after injection under conditions of a resin melting temperature of 130 ℃, injection pressure of 50%, and mold cooling temperature of 15 ℃. will be.

Item		unit	none	Calcium carbonate	Talc	Na-BZ	DEBS	MBS	DMBS
Melting point		℃	62	62	62	62	62	62	62
Crystallization temperature		℃	25	33	35	36	38	36	39
Mold Cooling Time		sec	115	75	74	65	63	68	61
Shrinkage		%	0.7	0.6	0.6	0.7	0.7	0.6	0.6
Solidification time			sec	210	165	160	152	147	154	153
liquidity	Spiral flow	Cm	57	55	54	55	57	56	56
	MI	g / 10min	51	57	50	50	48	58	45

In the above Table 4 (testing results of the structure according to the type of nucleating agent), the crystallization temperature is increased by 8 ° C compared to the case of using no nucleating agent, which significantly reduces the cooling time and the solidification time. In addition, the fluidity is maintained as it is, and also it can be seen that it is possible to improve the productivity by shortening the cycle time during product molding, thus solving the molding problem due to long cycle time.

The outer shell 20 attached by injection molding to the outer circumferential surface of the structure 10 should have an appropriate thickness and proper strength to prevent excessive deformation of the structure 10 as described above, and should also function as a cushioning material. do.

Accordingly, the present inventors, such as neoprene rubber, TPE (thermoplastic elastomer) rubber, SEBS (styrene ethylene butylene styrene) having various hardness on the outer circumferential surface of the mesh-like structure 10 to derive the shell material of the material having such a function As a result of molding and testing the outer shell material 20 made of rubber or silicon by double injection method, the difference in physical properties, whether neoprene rubber, TPE rubber, SEBS rubber or silicon is used as the outer shell material There was no significant difference, but there was a difference in the properties according to the hardness. However, when the hardness of neoprene rubber, TPE rubber, SEBS rubber or silicone is low, for example, when Shore D hardness is lower than 2, the structure is excessively deformed. If the hardness is greater than Shore D hardness 35, such as Shore D hardness 40 The function is excellent, but not only bad touch and deformability when in contact with the skin was confirmed that when the cast is applied to the affected part can not be easily deformed and installed according to the body's curvature, accordingly in the present invention 2 ~ Use rubber or silicone with a Shore D hardness in the 35 range.

On the other hand, polycaprolactone is expensive because it is an expensive polymer and a large molecular weight, and thus the inventors of the present invention, such as polyethylene (PE, polyethylene), polypropylene (PP, polypropylene), polybutene (PB, In order to understand the physical properties of polybutene), polyurethane (PU, polyurethane), and polyethylene terephthalate, the synthetic resins were blended with polycaprolactone, respectively. same. In this experiment, injection specimens were prepared using a polymer blended with 30 wt% of 4mm glass fiber and 20 wt% of synthetic resin in polycaprolactone having a molecular weight of 35,000 used in the experiments of Table 4 to measure physical properties and formability.

When blending each synthetic resin to polycaprolactone, polycaprolactone functions as a matrix, and the blended synthetic resin functions as a domain so that the content of synthetic resin (about 20% by weight relative to polycaprolactone) may be used. Each was adjusted so that the cast of the mesh structure could be deformed even when the heating temperature did not reach the melting point of the resin when the cast was heated to perform a cast on the affected part of the patient.

Synthetic resin	unit	none	PE	PP	PB	PU	PET
Processing temperature	℃	170	180	220	200	200	280
Cooling time	sec	115	120	170	160	160	290
The tensile strength	kg f / ㎠	385	368	374	357	376	379
modulus	kg f / ㎠	24,251	23,857	24,110	23,052	24,185	24,850
Impact strength	kg f / ㎠	13.7	14.2	12.6	13.0	14.1	13.5
Solidification time		sec	210	293	278	305	307	272

Experimental results, as can be seen in Table 5 (Test results of the physical properties of the composite resin blending), even if the polycaprolactone is blended with other synthetic resins in terms of mechanical properties such as tensile strength, modulus, impact strength No significant difference was found, and the processability of processing temperature and cooling time did not show a big difference according to the type of synthetic resin.However, in case of polyethylene phthalate (PET), the cooling time is long due to high processing temperature. It has been found to be useful when high strength is required due to excellent mechanical properties.

Therefore, polyethylene, polypropylene, and polybutene as polymers for forming the structure 10 are relatively lightweight and inexpensive, and polyurethane or polyethylene terephthalate is inexpensive, thus blending any one or more of the above synthetic resins. In the case of using polycaprolactone, it is possible to produce a cast that is light and inexpensive while maintaining mechanical properties.

On the other hand, the above described as manufacturing by the injection molding when manufacturing the outer shell 20 surrounding the outside of the structure 10, as described above, the outer shell 20 is not produced by the injection molding mixture of the binder and the rubber solution The outer shell 20 is formed by dipping and dipping the entire structure 10 in the reservoir, or a pair of sheets of rubber or silicon is placed up and down, and the structure 10 is interposed between these sheets. The outer shell 20 may be molded by fusion (sheet fusion) of the upper and lower sheets by ultrasonic welding or thermal fusion in the state where) is placed.

As described above, the present invention is made of a polycaprolactone composite having a reinforced structure of the cast skeleton, and the soft skin is wrapped around the structure to function as a reinforcement and deformation limiting factor for the structure to the affected part The cast procedure is easy and ensures the proper strength of the cast.

Claims (7)

1. In the cast to wrap and fix the body, such as the fracture site of the patient,

   The cast is made of a polycaprolactone composite, the structure having a net shape by repeatedly forming a polygonal opening; It consists of an outer shell 20 attached to the outer peripheral surface of the structure 10,

   The melting point of the polycaprolactone composite constituting the structure 10 has a range of 50 ~ 80 ℃,

   The shell 20 is cast, characterized in that made of rubber or silicon having a Shore D hardness in the range of 2 ~ 35.
2. The method according to claim 1,

   The polycaprolactone composite constituting the structure (10) is cast characterized in that it comprises a polycaprolactone in the range of 20,000 to 80,000 molecular weight.
3. The method according to claim 1,

   The mesh-shaped structure 10 is molded by injection molding or compression molding, and the shell 20 attached to the outer circumferential surface of the structure 10 is injection-molded with the structure 10 installed inside the mold. Cast formed by insert injection is made.
4. The method according to claim 1,

   The net-shaped structure (10) is molded by injection molding or compression molding, the outer casing (20) attached to the outer circumferential surface of the structure (10) is cast, characterized in that formed by heat fusion or dipping method.
5. The method according to claim 1,

   The polycaprolactone composite is cast, characterized in that any one or more synthetic resins of polyethylene, polypropylene, polybutene, polyurethane, polyethylene phthalate is added by blending.
6. The method according to claim 1 or 2,

   The polycaprolactone composite is a strength reinforcement made of glass fiber or carbon fiber is mixed, the strength reinforcement is cast characterized in that 10 to 60% by weight relative to the caprolactone composite.
7. The method according to any one of claims 1 to 5,

   The polycaprolactone composite is a cast, characterized in that at least one nucleating agent of calcium carbonate, talc, sodium benzoate, MBS, DMBS and DEBS is added.

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