JPH03202068A - Hardener for hydraulic cast - Google Patents

Abstract

PURPOSE:To safely and economically use the hardener for a hydraulic cast to freely harden from optional part without selecting the place of use and without polluting the periphery by constituting the hardener of a foamy material essentially consisting of water. CONSTITUTION:A liquid stabilizer for imparting the low-temp. stability of the soln. of the hardener and a penetrant for improving the penetration effect of the hardener to a base fabric are added to the hardener at need in addition to water, a foaming agent and a foam stabilizer as the components of the foamy material of the hardener. A basal winding material is wound on the lesion and the hydraulic cast formed by applying a water-active urethane prepolymer contg. the components to accelerate hardening on the fibrous base fabric having proper openings is wound thereon. The hardener sealed into a high pressure gas cylinder is ejected in the form of foam and this foam is taken on hand and is applied on the hydraulic cast. Since the hardener is applied and spread in the foam state on the cast, the dripping of water and the moistening of the under winding material during this time are obviated. The water which is the essential component of the hardener penetrates through the apertures of the cast on disappearance of the foam. The hardening is thus progressed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a hydraulic cast for forming casts used for fixing, supporting, and protecting orthopedic diseases such as fractures, sprains, dislocations, and corrections. Add hardener.

[Conventional technology]

Orthopedic diseases such as fractures, sprains, dislocations, and corrections are treated by keeping the affected area at rest by fixing, supporting, and protecting the upper and lower joints. To fix, support, and protect the affected area, wrap a lower wrapping material such as cotton wrapping, stocking net (cotton tube wrapping), or polyester nonwoven fabric around the area to be fixed, supported, and protected, and then wrap it over the lower wrapping material. Water is made by coating coarse woven or knitted fabrics made of natural fibers, semi-synthetic fibers, synthetic fibers, etc. with ingredients that harden by reacting with water, such as calcined gypsum, urethane resin, acrylic acid salts, etc., and forming them into sheets or rolls. The method used is to wrap a hard cast around it. In this method, the hydraulic cast is generally distributed in a sealed form in a water-resistant packaging material, which is opened at the time of use, soaked in a large amount of water, thoroughly absorbed, and then applied to the affected area. There is a problem in that during application, excess water adhering to the cast material falls off and wets the surrounding area, or wets the lower wrapping material wrapped to protect the affected area, causing discomfort to the patient. In addition, these hydraulic cast materials begin to react from the stage of contact with water,
It cures within 2 to 10 minutes, making it difficult to freely select the curing time. In other words, in general, if the water temperature is high, it will harden quickly, and if the water temperature is low, it will take too long to harden, so advanced operations are required, especially when the application area is small such as in the case of children. However, since it takes too long for the affected area to harden, it is necessary to take care to hold the affected area in a comfortable position during that time, and if the area is large, such as an adult's chest, it will harden midway if it is not wrapped quickly. The disadvantage is that the material becomes unusable.

In order to improve these points, we combined a urethane prepolymer that does not contain components that accelerate hardening applied to a coarse base fabric and a urethane prepolymer curing agent as a material that can be used without immersion in water. The applicant has proposed a hydraulic cast material for use in
However, in this cast material, the urethane prepolymer does not contain a curing component, so curing is slow, and the fool and the practitioner can maintain a comfortable position. In addition, when applying the hardening agent to the base fabric, there is a high possibility that excess hardening agent will come into contact with the practitioner's hands or the patient's skin, which may result in dermatitis. . On the other hand, it has the advantage that the curing speed can be selected by selecting the type of curing agent4, but the catalyst that is mixed in to adjust the curing speed has a high possibility of causing dermatitis, and the curing is uneven. It also has the disadvantage of becoming

[Problem to be solved by the invention]

The present invention is not affected by the size of the application area depending on the case to which it is applied, and can be cured freely from any part, and can be used anywhere, without polluting the surrounding area, safely and economically. The object of the present invention is to provide a usable curing agent for hydraulic casting.

[Means to solve the problem]

In order to achieve the above object, in the curing agent of the present invention,
The curing agent for hydraulic casting, in which a water-active urethane prepolymer containing a component that promotes curing is coated on a fibrous base fabric having openings, is composed of a foamy substance mainly composed of water.

In addition to water, the foam material may include a foaming agent and a foam safety agent.

The foam density of the foam material is advantageously chosen to be between 0.01 and 0.2 g/cm@3.

Preferably, the foam material can be used by combining water, a foaming agent, and a foam stabilizer in a high-pressure gas cylinder.

[Effect]

In the present invention, a hydraulic cast made of a fibrous base fabric with openings coated with a water-active urethane prepolymer is wrapped around the affected area, and then the curing agent is applied to the cast by hand or directly onto the cast. After application, it is spread evenly by hand, allowing the foam-like curing agent to penetrate into the cast and proceed with curing without causing excess moisture to drip.

〔Example〕

Next, examples of the present invention will be described.

Foaming agents are substances that have a foaming effect on water, which is the main component of curing agents, and mainly include higher fatty acid salts, higher alkyl sulfate ester salts, higher alkyl ether sulfate ester salts, alkylaryl sulfonates, carboxybetaine, and imidazolytes. Surfactants such as nium betaine, aminocarboxylic acid salts, alkylolamides, and alkylamine oxides can be used. These salts are mainly sodium salts, potassium salts,
They are amine salts and ammonium salts.

Specific examples of foaming agents include sodium laurate, potassium laurate, ammonium laurate, potassium octylate, sodium palmitate, potassium palmitate, ammonium palmitate, sodium lauryl sulfate, triethanolane lauryl sulfate, and polyester. Sodium oxyethylene lauryl sulfate, sodium polyoxyethylene lauryl ether sulfate, potassium polyoxyethylene lauryl ether sulfate, triethanolamine polyoxyethylene lauryl sulfate, ammonium dodecylbenzenesulfonate, coconut oil fatty acid amidopropyl betaine, 2-alkyl-N- Carboxymethyl-N-hydroxyethylimidazolinium betaine, 2-undecyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, sodium lauryl di(aminoethyl)glycine, coconut oil fatty acid jetanolamide, polyoxyethylene coconut Examples include oil fatty acid monoethanolamide, lauric acid jetanolamide, and lauryl dimethylamine oxide.

Foam stabilizers are substances that improve the stability of foam formed in water, which is the main component of hardeners, and include surfactants such as alkylolamides, polyoxyethylene dialkyl ethers, and polyoxyethylene dialkyl esters, and water-soluble polymers. can be used.

Specific examples of foam stabilizers include lauric acid jetanolamide, coconut oil fatty acid jetanolamide, polyoxyethylene coconut oil fatty acid monoethanolamide, polyoxyethylene dilauryl ether, polyoxyethylene distearate, polyvinyl alcohol, polyvinyl Examples include pyrrolidone, sodium alginate, carboxymethylcellulose, and sodium polyacrylate.

In addition to water, a foaming agent, and a foam stabilizer, the foam material includes a liquid stabilizer for imparting low-temperature stability to the hardening agent solution as needed, and a base fabric for the foamed hardening agent. Penetrants can be added to improve the penetration effect. As the liquid stabilizer, glycerin, ethylene glycol, diethylene glycol, propylene glycol, ethyl cellosolve, etc. are used, and as the penetrant, sodium dioctyl sulfosuccinate, polyoxyethylene alkyl ether, polyoxyethylene alkyl allyl ether, etc. are used. Ru.

The blending ratio of each component of the foam material is 10 to 50% foaming agent.
Preferably, the foam stabilizer is contained in a range of 1 to 0%, and the water is contained in a range of 39 to 90%.

The liquid stabilizer may be contained in an amount of 1 to 10%, preferably 2 to 5%, and the penetrant may be contained in an amount of 1% or less.

Each component of the foam material can be made into a foam by, for example, sealing it in a high-pressure gas cylinder together with an injection gas and injecting it, but the bubble density is 0.01 to 0.2 g/cd, preferably 0.02 to It is best to choose 0.1 g/cd. This bubble density is a value that is easy to handle when the curing agent is picked up or sprayed directly onto a hydraulic cast. If this density is too high, it will be in a state close to water. If you pick it up, it will groove and clean, staining the surrounding area and wetting the lower material. Also, if the density is too low, the volume used will be too large, and you will have to repeat the operation many times. Therefore, the above range is preferable.

Further, the curing agent of the present invention has a hardening agent of at least 10
It is preferable that the foam stays for at least 1 minute, preferably for at least 1 minute, and that the foam disappears within 5 minutes at the latest, preferably within 2 minutes after being applied to the cast. It is impossible to apply the hardening agent evenly to the hard cast, and if the defoaming time is longer than 5 minutes, the foam will not disappear even if you apply the hardening agent to the cast and rub it in by hand.
The above range is preferable because the entire amount of the curing agent used does not come into contact with the cast, slowing down the curing time, prolonging the drying of the cast, or filling the holes in the cast and impeding air permeability.

To explain one example of the method of using the curing agent of the present invention, first, a lower wrapping material is wrapped around the affected area, and on top of that, a water-active urethane prepolymer containing a component that accelerates curing is applied to a fibrous base fabric with moderate openings. Wrap the applied hydraulic cast around it. The curing agent of the present invention sealed in a high-pressure gas cylinder is squirted out to form a foam, which is then picked up and applied to the hydraulic cast.
Spread evenly over the cast using your hands. In this case, you can squirt the hardening agent directly onto the cast from a gas cylinder and then spread it by hand.The hardening agent is spread in the form of a foam over the cast, so there is no chance of moisture dripping or wetting the bottom material during that time. As the bubbles disappear, water, the main component of the curing agent, permeates through the openings in the cast, and the urethane prepolymer hardens from the outside toward the inside. At this time, the practitioner can manipulate the inner layer of the hydraulic cast to fit the delicate unevenness of the affected area while checking the hardening state.

Instead of applying the hardening agent to the entire surface of the hydraulic cast at once, it is also possible to apply the hardening agent to the areas that you want to harden quickly, and then fix, support, and protect that area while slowly curing the other areas.

Examples of the curing agent components of the present invention are shown below.

Okugami Potassium Laurate 30! (Foaming agent) Potassium octylate 10 (Foaming agent) Propylene glycol 5 (Liquid stability law) Sodium dioctyl sulfosuccinate 1 (Penetrating agent) Water
49 An aerosol container was prepared in which the above components were placed together with LPG. The foam density was 0.045 g/d, and the foam activity and defoaming time were 1 minute or more and 0.7 minutes, respectively.

Twist 1 Propylene glycol 2 (Liquid stability law) Water
83 An aerosol container was prepared in which the above components were placed together with LPG. The bubble density is 0
．． 03g/cii, its foam activity and defoaming time are each 1
It was more than 0.5 minutes.

Wataru Amidopropyl Betaine 5 (Kiseikai) Polyoxyethylene Distearate 5 (Foam Stabilizer) Water
70 An aerosol container was prepared in which the above components were placed together with LPG. The bubble density is 0
．． 10g/cm3, its foam activity and defoaming time are each 1
It was more than 1.5 minutes.

〔Effect of the invention〕

According to the present invention, since the hardening agent whose main component is water is foam-like, there is no need to prepare water in a container as in the past, and a special room (such as a cast room) is required for the treatment area. It is unnecessary and can be advantageously used for emergency purposes in places where there is no water, such as cars and airplanes.Furthermore, since it does not scatter or drip like water, it does not stain the surrounding area or clothes. The material will not get wet and cause discomfort to the patient.

By giving the curing agent an appropriate part activation time and defoaming time, it is possible to apply the minimum necessary amount of curing agent to the designated area of the hydraulic cast by hand while visually checking the shape retention properties during that time. The molding operation can be carried out using a molding method, making it possible to cast accurately and economically.Moreover, due to the effective contact between the hardening agent and the hydraulic cast, the curing reaction progresses evenly and uniformly, and the cast dries quickly.

The curing agent is mainly water-based and does not contain substances that can cause dermatitis, so it can be used safely.

Furthermore, when using the hardening agent of the present invention, the hydraulic cast itself does not need to be soaked in water and then rolled up as in the past, so the hardening reaction does not proceed during the rolling period, regardless of the size of the affected area. It is possible to wrap the area in a way that is most suitable for the shape and condition of the affected area, and unlike conventional hydraulic casts that are soaked in water and used, hardening starts from the inside, using the hardening agent of the present invention, the hardening agent starts to harden from the outside. As hardening progresses towards
The practitioner can fit the inside of the hydraulic cast to the delicate unevenness of the affected area while checking the hardening state.

Claims (1)

[Scope of Claims] 1) A curing agent for hydraulic casting in which a water-active urethane prepolymer containing a component that promotes curing is coated on a fibrous base fabric having openings, the curing agent mainly containing water. A curing agent for hydraulic casting characterized by being a foamy substance. 2) The curing agent for hydraulic casting according to claim 1, wherein the foam material comprises water, a foaming agent, and a foam stabilizer. 3) The foam density of the foam material is 0.01 to 0.2 g/cm^
3. The curing agent for hydraulic casting according to claim 1 or 2, characterized in that: 4) Claims 1 to 3, characterized in that a foamy substance consisting of water, a foaming agent, and a foam stabilizer is blended into a high-pressure gas cylinder.
A curing agent for hydraulic casting described in .