DE2823340A1 - ORTHOPEDIC BANDING AND ITS USE IN THE MAKING OF RIGID ORTHOPEDIC BANDING - Google Patents

Description

Orthopedic bandages and their use in manufacture of stiff orthopedic bandages

The invention relates to an orthopedic bandage, which means a polymer catalyzed by free radicals.} on sre- · aktiori hardens. The bandage contains a bandage-forming compound ("Cant forming composition") which is a solid, water-soluble vinylinonomer, such as diacetone acrylamide (DAA), N-isopropyl acryamide (N-IPA) or a mixture thereof, and at least one component of an improved redox catalyst system which capable of initiating the polymerization of the vinyl monomer and a copper-containing compound in combination comprises with a reducing agent. The bandage-forming mass is on a flexible carrier, for example onto a pseudo-leno-glass fiber fabric ("mock leno woven fiberglass") upset. The sanitary napkin preferably also contains a plasticizer, such as Ί, 2-ditert-glycol, to improve the fit au improve. Iron (II) sulfate, Sodium sulfite, oxalic acid or the like. Be present. As containing heads Compound copper (II) acetylacetonate is preferred.

8Ü98A9 / 091 2

The polymerization of the monomers mentioned can be initiated by applying the bond in the presence of the improved redox catalyst system is brought into contact with water, for example by dipping the sanitary napkin onto which the improved Redox catalyst system has been applied in tap water.

According to one embodiment of the invention, the bandage contains the improved redox catalyst system in combination with the monomer on the flexible carrier. This product shows excellent storage stability and can be sold as a one-component product. In contrast to conventional catalysts which are used to initiate the hardening of orthopedic bandages, the improved redox catalyst system of the invention allows a uniform curing rate, even if the curing is initiated agreements nr by tap water with different Veru.

Previously used to make surgical dressings, which was restraining and support of "body parts such as legs are _five arms, wrists, neck, and the like, is used. Almost exclusively on tissue or gauze applied plaster. Plaster is cheap, readily available and after In addition, practically all doctors, especially orthopedic surgeons, have been using plaster of paris for a long time and are very familiar with its application. Once a doctor has mastered the use of plaster of paris, he is reluctant to try other procedures using other media.

Nevertheless, plaster of paris has various disadvantages «It is relatively heavy and can be damaged if moistened with water. Further Plaster of paris is essentially opaque to X-rays, so that it is occasionally necessary to apply bandages

809849/0912 D? Jginal inspected

to remove, "for example, to achieve satisfactory healing detect a fracture.

The aforementioned difficulties with orthopedic bandages based on plaster of paris, for example, have been developing the bandage according to US Pat. No. 3,630,194. This bandage Hasse uses a mixture that forms a bandage that is soluble in water Monomers from the group DAA, Ν-ΓΡΑ and mixtures of which contains. These monomers are in the presence of water by means of a redox catalyst system, which is an oxidation component and containing a reducing agent, polymerizable. This bandage is made in a similar fashion to traditional plaster of paris bandages hardened by immersing the bandage in tap water. The advantage of this process is the initiation of polymerization that bandage donning personnel do not use new dressing techniques You have to learn how to do this with certain other sanitary napkins that use thermoplastic films or those that are curable Synthetic resins are applied in paste form, the case is "

Although the napkins of U.S. Patent 3,630,194 do in many ways are satisfactory, they have been found to have certain disadvantages. For example, it was found that the curing speed depending on the nature the tap water used to initiate the polymerization reaction varies. An investigation into this The phenomenon surprisingly led to the finding that the presence of various impurities in tap water, like copper, leads to the uneven hardening speeds.

When both the oxidation and the reduction components of the catalyst are introduced into the bond-forming mass and not one or both components of the tap water

809849/0912

can be added "in these conventional products no storage stability can be determined.

It has also been found that the napkin of U.S. Patent 3,630 does not have the desired initial strength (hereinafter "green strength" ¹ ), that is, it can take 1 hour to achieve acceptable strength at ambient temperature if the flexible backing does not made of fiberglass fabric or other material of low expansion and high original modulus.

As noted in various references, see U.S. Patents 3 787 272, 3 793 686, and 3 686 725 have fiberglass mesh certain properties that are undesirable for orthopedic bandages are. For example, due to the fragility of the fibers, it has a poor fit or adaptability.

The fabrics of U.S. Patents 3,787,272, 3,793,686, and 3,686 it is a knitted glass fiber fabric. Although these fabrics have an adequate fit, it does so Arrangement does not have adequate "green strength" with the bond-forming Mass of U.S. Patent 3,630,194. It is believed that Knitted glass fiber fabrics are not suitable for use with these mainly andbilical masses, as those given by polymerization are those given there Monomeric polymers contain a relatively low T value have what, in contrast to other conventional polymers that are used as plaster substitutes, such as Methyl acrylate polymers.

It was found to be a pseudo-leno fiberglass fabric ("mock leno woven fiberglass") can be used as a carrier due to its strength, fit and open weave can, wherein the aforementioned difficulties can be overcome.

809849/0912

It has been found, however, that it is desirable to maintain adjustability while wrapping the napkin around the To improve the limbs of the patient by adding a plasticizer to the monomer, such as 1,2-ditert.-glycol, for example Pinacol, incorporated.

As explained below, the addition of pinacol, the ^. particularly preferred plasticizers, the processing time of the orthopedic bandage according to the invention in an unexpected manner increased to allow more time to wrap the bandage around the patient's limbs.

According to the invention, a new orthopedic bandage is made available which comprises a bandage-forming mass with a redox catalyst system which has a copper-containing compound in combination with a reducing agent, and a monomer which is polymerizable by means of the redox catalyst system. The monomer is a water-soluble, solid, vinyl monomer, for example Dili, N-IPA or mixtures _; of that.

The orthopedic bandage is prepared before use by washing it with an aqueous medium, preferably with hot one Tap water, in the presence of a catalytic amount of the redox catalyst containing the copper-containing compound, is brought into contact, whereby the vinyl monomer is polymerized. The polymerization catalyst can be the aqueous Medium itself can be added. However, it can also be incorporated into the compound-forming mass. In the latter In this case, the bandage must be kept dry and excluded from contact with humidity. Since both that Copper salt and the reducing agent are required to initiate the polymerization reaction, a catalyst can

809849/0912

component excluded from the compound-forming compound and added to the water when the bandage is immersed will. This will reduce the sanitary napkin sensitivity to water or humid air.

Preferably, both catalyst components are the bond-forming Incorporated mass so that the orthopedic surgeon just put the bandage ~ "in Water needs to be immersed in order to initiate polymerization and to prepare the sanitary napkin for use. This simple one The process is essentially just a reworking of the process to be used for plaster of paris bandages. If not all of the catalyst is incorporated into the compound-forming mass, the orthopedic surgeon must add the missing catalyst component to the water in which the bandage is immersed, "add.

A bandage containing both catalyst components in the bond-forming monomer is known as a "one-pack system". The orthopedic surgeons prefer this packaging system for reasons of convenience. The packaging system of the invention As explained below, Binde has iin. comparison to the technically possible packaging systems of TJS-PS 3 630 194 · an improved storage stability.

Reducing agents for producing the redox catalyst system are known. Examples are iron (II) sulfate, sodium sulfite, Sodium dithionite, iron (II) chloride, sodium formaldehyde sulfoxylate, Oxalic acid, cobalt (II) chloride and hydrazine. All of these known reducing agents are suitable components for the redox catalyst system and can be used according to the invention.

The copper-containing compound acts as an oxidizing agent of the redox catalyst system. Preferably the copper-containing compound is only partially in water at room temperature soluble. Very soluble copper salts, such as sulphate

809849/091 2

and chloride, release such massive concentrations of copper ions in the water, " that the polymerization of the monomer proceeds quickly and the curing time of the bandage is difficult to control. Partially soluble copper-containing compounds, such as acetylacetonate, set just a sufficient amount Copper ions release so that the bandage has a reasonable working time (60 to 70 seconds). Very insoluble copper compounds, such as phosphate, do not release sufficient amounts of copper ions to initiate polymerization. Therefore, these compounds are not preferred when using tap water to initiate the Polymerization of the monomer is used.

For this reason, copper (II) acetylacetonate and copper salts are with similar solubility in water at room temperature are particularly preferred.

The copper salt can be 0.0005 to 5 percent by weight, preferably 0.0005 to 1 »0 percent by weight and in particular 0.01 to Make up 0.10 percent by weight of the napkin (either in the napkin or in the immersion water). The molar ratio of reducing agent to copper salt can vary from 100: 1 to 5: 1, in particular 50: 1.

The amount of the compound-forming mass can be 50 to 800 and insr, /

in particular 200 to 500 percent by weight, based on the flexible carrier. Of the total solids in the dressing By mass, the monomer can make up about 30 to 100 and in particular 50 to 80 percent by weight. The rest contains binders, fillers, comonomers (apart from the water-soluble, solid vinyl monomers), redox catalyst components (if they are incorporated into the compound-forming mass) and the like.

809849/0912

The bandages of the invention can be prepared 3 630 19 ² I in a similar manner as the binding of the US-PS, packaged and used. Materials for producing the binding according to the invention (with the exception of the redox catalyst system and the monomers, but including the flexible carrier, the comonomers, binders, fillers, regulators for the polymerization rate and the like) are also described in the aforementioned publication. Thus, with regard to these materials, the manufacturing process, the packaging and the use, reference is made to the cited publication. No buffer is required for the effect of the copper in the orthopedic bandage according to the invention. When using persulfate initiators large quantities of persulfates are required. Since persulfates break down into acidic products that are harmful to the skin, buffers are required. Since very little copper can be used in the napkins according to the invention, the pH of the moist napkin does not change. Sodium sulfite, the preferred reagent used with cupric acetylacetonate, acts as its own buffer.

In order to provide an orthopedic bandage which is optimally matched in terms of adaptability and structural stability and which after curing results in a high-strength, water-insensitive and radiolucent bandage, the flexible carrier preferably consists of a pseudo-leno fabric made of polymer fibers from low expansion and a high original modulus, for example made of glass fibers. Polymers with a high original modulus are understood to mean those with a modulus of more than 350,000 kg / cm (5,000,000 lbs./in. ² ), measured in accordance with ASTM 2256-75.

It should be noted that the pseudo-

809849/0912

Leno fabric, preferably in combination with the aforementioned redox catalyst system containing a copper compound is used. The use of the pseudo-leno fabric however, it is not limited to this. For example, the redox catalyst system described in US Pat. No. 3,630,194 can be used in conjunction with the pseudo leno fabric, with similar improvements in conformability and structural stability orthopedic bandages can be achieved. Pseudo leno fabrics are known and are broadly defined as fabrics in which groups of 3 or more warp or weft threads are intertwined so that the threads each Groups in a bundle can easily come together while being separated from the neighboring groups in that the last thread of a group and the first thread of the next group are intertwined in a directly opposite arrangement. Such an incision prevents two threads from reaching each other and an opening at this point Such fabrics can be made from glass fibers and are commercially available.

A minimum bundle of 3 warp and weft threads is required necessary for the pseudo-leno arrangement. Any number of additional Threads be present. Examples of different pseudo-leno arrangements are in the Handbook of Weaves, G.H. Gelsner, Dover Publications, Inc., New York.

A preferred arrangement has groups of 3 warp threads, around . to avoid that more than one adjacent glass fiber yarn forms the same interweaving pattern with the weft. The inextensible nature of glass fibers causes an or several adjacent warp yarns that are intertwined with the weft yarns "burst out" from the surface of the finished fabric .. This gives a bad appearance.

809849/0912

The pseudo-leno fabric structure is shown in FIGS. Fig. 1 shows a fabric in which the warp threads (1) and the weft threads (2) are arranged in groups of three. In the fabric of FIG. 4, the warp threads (1) and the Weft threads (2) each arranged in groups of four.

For the production of the bandages according to the invention, "IT The open texture is characteristic of every tissue. For example, the fabric has holes measuring 1.27 to 31.81 mm (0.05 to 0.15 in.) In the warp direction and 0.64 to 2.54 mm (0.025 to 0.10 in.) In the weft direction.

Dac fabrics can weigh from 170 to 340 g / m (5.0 to

ο 10.0 oz / sq.yard) and preferably from 203 to 220 g / m (6.0 to 6.5 oz. / Sq.yard). The yarn is what it is is a multi-ply yarn with a diameter of the monofilaments from 0.0038 to 0.0091 mm (0.00015 to 0.00036 in.) can vary. Preferably the diameter is about 0.0064 mm (0.00025 in.). The yarn can be 50 to 2500 single threads exhibit. Glass fibers suitable for making such a fabric are available from Owens, for example Corning Fiberglass Corporation and Pittsburgh Plate Glass, Fiber Glass Division. The tissue can be 20 to 30 Have chains per 1 in. And 10 to 18 picks per 1 in. The fabric can be twisted, for example Have 0.5 to 1.0 twists per 1 inch (2.54 cm). A certain twist in the yarn is desirable in order to facilitate weaving. A minimum twist compatible with the ease of processability is desirable in order to ensure the adaptability of the finished impregnated product. For this reason, 0.5 to 1.0 twists per 1 in. (2.54 cm) are preferred, although yarns of any convenient number of twists per 2.54 cm are also used can be. It can use commercial, multi-strand yarn as well as specially manufactured multi-strand yarn. total yarn to yarn sizes used by manufacturers for multi-thread

809849/091 2

Fiberglass yarn is not offered, used to achieve will. However, single yarns are preferably used, about a twist of folds that interferes with adaptability, to avoid.

Balanced fabric, (fabric with the same yarn size in warp and weft) is preferred in order to Strengthen the end product in both directions. However, it can also be any unbalanced arrangement be applied.

Other non-glass fiber yarns that have a similar high original modulus can also be used and have similar elongation properties. For example, Kevlar yarn, an aramid product from E. I. du Pont de Nemours (fiber in which the fiber-forming substance consists of a long-chain, synthetic polyamide, in which at least 85 percent of the amide bonds are bonded directly to the two aromatic rings). For cost reasons and because of because of its easy accessibility, glass fibers are preferred «

It has been found that it is advantageous to 630,194 · to undergo pseudo-leno fiberglass fabric before applying the bandage forming composition according to the method of US-PS 3 'to a heat treatment by firing in air at temperatures of 300 to 55O ⁰ C, to remove residual components that adhere to the fabric after its manufacture. For example, chain sizes and the like should be removed by the heat treatment. The fabric subjected to the heat treatment can then be impregnated with an aqueous solution of a silane, such as ^ -methacryloxypropyltrimethoxysilane, ^ -aminopropyltriethoxysilane or glycidoxypropyltrimethoxysilane, and then dried. The fabric obtained thus has a superficial silane layer which facilitates the bonding of the compound-forming mass to the fabric.

809849/0912

Vie in the TJS-PS 3 630 194 · described, additional Adhesives can be used to bond the bandage-forming mass to the tissue.

Thus, the preferred flexible carrier for producing the sanitary napkins according to the invention consists of glass fiber (regardless of this whether the particularly preferred pseudo leno fabric is used). Glass fibers are preferred because they add to the strength of the dressing, especially during the early on the activation of the following stage, i.e. glass fibers contribute to the "green strength" of the bandages formed from the bandages at. Glass fibers are very brittle fibers. Fabrics made from them are particularly known for their non-adaptability. The incorporation of a polyglycol, preferably a 1,2-di-tert-glycol, in Bandages using glass fibers make it adaptable and make winding easier without that the desired strength properties of the bandages based on fiberglass are impaired.

Corresponding 1,2-di-tert-glycols have the following general characteristics Formula on:

«Ι Λ

V \ IX

OH OH

in which R ₁ , R ^, r -m ^ r ^ each denote alkyl radicals, for example those having 1 to 5 carbon atoms.

A particularly preferred 1,2-di-tert-glycol is pinacol, where IL = E «= R_ = R. = CH, means. Pinacol also has the effect of

809849/0912

- 1ft ~

As explained below, a longer turnaround time, which means that "the orthopedic surgeon" has more time to make the dressing There is time left for the bandage to harden until it becomes difficult to swaddle. However, pinacol affects the overall curing time does not and does not cause a reduction in "green strength". The 1,2-ditert.-glycol should be in one concentration from 0.2 to 10 percent by weight and in particular from 0.5 to 2 percent by weight, based on the total weight of the coated Sanitary napkin can be incorporated to improve the adaptability of the sanitary napkin.

The examples illustrate the invention.

example 1

Production of a copper (II) acetylacetonate (CAA) containing Bandage

A fiberglass web is moved through a melt at a speed of 2.4 meters / min (8 ft / min), the 975 Parts of diacetone acrylamide, 20 parts of polyethylene oxide such as Carbowax 4000 from Union Carbide Corporation, New York, 43 parts Pinacol and 10 parts of a molecular sieve such as JA molecular sieve from Union Carbide Corporation, Linde Division, New Xork, contains. A catalyst mixture containing 136 parts of a premix (the premix contains 960 parts Parts of sodium sulfate and 40 parts of copper (II) acetylacetonate), 644 parts of sodium sulfite and 17 parts of a high molecular weight (molecular weight about 5,000,000) polyethylene oxide such as Polyox Coagulant Grade from Union Carbide Corporation, Chemicals and Plastics Division, New York, is made at a rate of 6 g / min sprinkled on before the melt solidifies. The impregnated fabric is then placed in pads of 2.7 meters (3 yard) cut length.

809849/0912

Bandages are applied by immersing the bandage in water for up to 5 seconds and wrapping it over the appropriate limb. The water temperature for immersion is 24 to 32 ⁰ C (75 ° to 90 ° F.).

Example 2

Preparation of a bandage containing potassium persulphate -

A glass fiber fabric is passed through a melt containing 975 parts of diacetone acrylamide, 20 parts of Carbowax 4000, 45 parts of Pinaccl and 10 parts of the ~ $ k molecular sieve at a speed of 2.4 meters / min (8 ft / min).

A catalyst mixture containing 775 parts of potassium persulfate, 740 parts of sodium sulfite and 326 parts of sodium carbonate is sprinkled onto the fabric at a rate of 7-5 g / min before the melt solidifies. The impregnated fabric is then cut into napkins that are 2.2 meters (3 yards) long. Bandages are applied by immersing the bandages in water for up to 5 seconds and wrapping them around the appropriate limb. The temperature of the immersion water is 24 to 32 ° C (75 to 90 ° P.)

Example 3 Manufacture of a bandage containing ammonium sulfate

A fiber filament artery is made at a speed of. 2.4 meters / min (8 ft / min) through a melt containing 975 parts of diacetone acrylamide, 20 parts of Carbowax 4000, 43 Parts of pinacol and 10 parts of the molecular sieve type 3A agitated. A catalyst mixture containing 7 ^ -0 parts of ammonium persulfate, 740 parts of sodium sulfite and 326 parts of sodium carbonate is added to the at a rate of 5> 3 g / min Tissue sprinkled on before the melt solidifies. The impregnated fabric is then placed in 2.7 meter (3 yard) napkins

809849/0912

cut up. Bandages are applied by immersing the bandage in water for up to 5 seconds and wrapping it over the appropriate limb. The temperature of the immersion water is 24 to 32 ° C (75 to 90 ° i ¹ ).

Example 4

Comparison of the aging of bandages with ammonium sulfate ~~ " and Eupfer (II) acetylacetonate, average processing time * of sanitary towels in seconds as a function of storage time

initiator
Storage temperature,
⁰ C Ammonium persulfate copper (II) acetyl
acetone
21.1 37.8 48 »9 21.1 37.8 48.9 - 49 49 78
no
values 64
73 63
68 Storage time, weeks 48 poly
meri
sated 85 73 75 O 49 64 70 52 1
2 58 no
values 66 51 3 60 43 4th no
values 68 poly-
meri- VJ) • 6th 7th

sated

68

* Under the sanitary napkin processing time is the time (seconds) from immersing the sanitary napkin in the water to the time when the person changing the diaper has the feeling that it is not possible to change the bandage without applying pressure, to understand. If the diaper does not need to apply pressure at any point, processing time is easy the time it takes to completely wrap the bandage increases

809849/0912

to understand. If the diaper does not apply pressure, the polymerizing monomer becomes too tough for the diaper The bandage can be easily wrapped.

The table above shows that the orthopedic bandages using Eupfer (II) acetylacetonate as the oxidation component of the redox catalyst system in the -. like ammonium sulfate, which is used as an oxidation component in the bindings of US Pat. No. 3,630,194, have an improved shelf life.

Example 5 Manufacture of bandages containing eupper phosphate

Glass fiber fabric is fed at a speed of 2.4 meters / min by a melt containing 975 parts of diacetone acrylamide, 20 parts of Carbowax WOO, 43 parts of pinacol and 10 parts JA type molecular sieve. moved * A catalyst mixture with a content of 106 parts of a premix (the premix contains 960 parts of sodium sulfite and 40 parts of copper phosphate), 694 parts of sodium sulfite and 20 parts of polyox (Coagulant Grade) is sprinkled onto the fabric at a rate of 4 g / min before the melt solidifies. That Impregnated fabric is then cut into 3 yard napkins.

By soaking 3 of these pads in water and swaddling no bandage can be made around a corresponding limb. The immersion water is clear, indicating that there is no polymerization has taken place. The subject of polymerization that has occurred is the immersion water through polymerized diacetone acrylamide clouded. Process for increasing the solubility of copper phosphate . and thus to harden the bandages are known, for example by changing the pH and the temperature of the

809849/0912

Immersion water regulates. However, when using less soluble copper salts, for example of the aforementioned phosphate, cause additional problems, so that massive water-soluble salts such as acetylacetonate are particularly preferred for the purposes of the invention.

Example 6 __

Clinical comparisons of sanitary napkins containing CAA and

Samples of the hardened dressing material of Examples 1 and 2 are placed on the backs of 2 groups of 25 adult test subjects applied and left there for 72 hours under a tightly fitting garment. The results this primary irritation test show that one of the 25 subjects shows a 1+ irritation reaction (mild erythema) in the bandage of Example 1. Thus it follows that the material according to the invention has only a slight primary irritant effect.

7 of the 25 test persons show a 1+ stimulus reaction with the bandage from Example 2. Thus, it follows that the bonding produced by the erfxndungsgemässen catalyst as compared to conventional napkins with ⁸ ^ I ^^ Oq - ⁵ catalyst are prepared, provides the surprising advantage of reduced irritation.

Example 7

Manufacture of a sanitary napkin using a pseudo-leno fiberglass fabric

A 6-leaf pseudo-leno glass fiber fabric which is modified by adding a warp yarn plain weave between groups of 3 chain ends in the pseudo-leno configuration is produced. This fabric is cleaned minute 4-5 by treatment at 548 ⁰ C (1000 ⁰ F)

8098A9 / 0912

and with an aqueous, 1.0 weight percent solution of ^ -Methaciryloxypropyltrimethoxysilane (Union Carbide A 174) "Treated. The silane is applied to the fabric by it is immersed in a solution of 20 ml of silane added to 2 liters of water. The tissue is 10 seconds immersed in the solution and after draining off the excess Solution air dried. A monomolecular silane layer on the glass fiber fabric is desirable. Therefore the weight of the glass fibers to be treated in the solution is not critical. The solution can be applied completely. The amount of melt absorbed by the fabric is 59 percent by weight, based on the fabric. Then will the compound-forming mass specified below is applied from a melt:

975 grams of diacetone acrylamide

20 g polyethylene oxide (Carbowax 4000, Union Carbide) 36.3 g glycerin
13.6g propylene glycol
25j3 g of carboxymethyl cellulose

The combined forming composition is heated to about 60 to 62 ⁰ C, which is sufficient for melting the mixture, without any degradation of the components is caused. Bindings measuring 6.35 x 229 cm (2 1/2 χ 90 in.) Are rolled and immersed in 500 ml of water containing the catalyst specified below at room temperature of about 24 ° C:

20 g ammonium persulfate. -.

20 g of sodium persulfite

14 g sodium hydrogen carbonate

The sanitary napkins are then placed on a 7 »5 cm (2 3/4 in.) Post. wrapped. The crust strength for the bandage flexing 1 1/2 cm after curing for 10 minutes at room temperature is given below:

809849/0912

Crust strength, (72.5) kK (Its) (62.5) 32.89 (57.5) 28.35 (86.0) 26.08 (82.5) 39.01 37.42

bandage

1
2

3 4th

The crust strength is measured using a testing device of John Chatillon and Sons, New York, model UTSMj with a measuring range of 0 "to 113.4 kg (0 to 250 lbs) and measured on a 1.13 kg (2.5 lbs) graduation. The test speed is 15 in. per minute. The values obtained are with the values of control fabrics Linen weave comparable. When evaluating the winding behavior when wrapping around an arm, it can be subjectively determined that the ρseudo-leno arrangement is compared to liberal glass fabric plain weave is superior in terms of adaptability and aesthetic properties.

Example 8

The sanitary napkin of Example 7 is wrapped on a forearm. Wrapping a

Limb, corresponds to wrapping around a conical shape. When wrapping a conical shape with a tape material there are gaps between the tape being wound and the previous layer, as the wrapping takes place from the larger to the smaller diameter of the conical shape.

Also occur when wrapping plaster bandages around limbs Gaps that can be eliminated by folding the material or tucking in the bandage. The light weight and the lack of resilience of cotton gauze in plaster of paris bandages, in combination with the great weight of plaster of paris, has one effect

809849/0912

Minimum of surface defects in this bandage folded over the surface.

When wrapping closed 3-layer glass fabric with linen weaves the gaps that appear inside the dressing must be folded over the subsequent layers and lead to considerable lump formation in these areas. This creates pressure points on the skin and can damage the skin to lead. The resilience of fiberglass fabric and the lack of monomer tackiness causes the gaps will remain on the surface of the final winding as the fabric will not remain folded. This leads to a bad one Texture of the surface.

When using sanitary napkins based on pseudo-leno fiberglass fabric it is not necessary to fold or wrap the bandage when changing. The open nature of the tissue allows sufficient deformation so that voids are removed immediately after they are formed can. No lumps are formed inside the dressing. The surface finish of the dressing is therefore acceptable.

Example 9 Manufacture; a sanitary napkin without plasticizers

A glass fiber fabric is moved at a speed of 9 »1 m / min (30 ft) through a melt containing 975 parts of diacetone acrylamide, 20 parts of Carbowax 4000, 30 parts of amorphous Silicon dioxide (Aerosil R-972) and 10 parts molecular sieve type 3A. emotional.

A mixture of 106 parts of a mixture of 24 parts Sodium sulfite and 1 part copper (II) acetylacetonate, 694 parts Sodium sulfite and 22 parts of Polyox are

809849/0912

speed of 11 g / min on the fabric coming out of the melt scattered.

After the melt has completely solidified on the fabric, the bandage is ready for use.

Example 10 Manufacture of a bandage containing trimethylolpropane

A fiberglass fabric is made at a speed of 9 min (30 ft / min) through a melt containing 975 parts of diacetone acrylamide, 20 parts of Carbowax 4000, 30 parts Aerosil B.-972, 43 parts of trimethylolpropane and 10 parts of molecular sieve Type JA- moved. The tissue coming from the melt is at a rate of 11 g / min with a mixture of 694 parts of sodium sulfite, 22 parts of Polyox (Coagulant Grade) and 106 parts of a mixture of 24 parts of I sodium sulfite and 1 part of copper (II) acetylacetonate sprinkled.

After the melt has completely solidified on the fabric, the bandage is ready for use.

It is noted that Aerosil R-972 prevented when added to the binder melting of the! Solids on the napkin at a storage temperature of 48.9 ⁰ C (120 ° F). Melting at this temperature occurs only when a plasticizer such as pinacol, trimethylolpropane and the like is used.

Example 11 *

Test of the bandages for their adaptability

The sanitary napkins of Examples 1, 9 and 10 are placed in an Instron test device brought to measure the ease with which the napkins can be bent. The sanitary napkins are horizontally across 2 rods 2.54 cm (1 in.) apart

809849/0912

tense. There is a third between the two bars Rod moving at a speed of 2.54 cm (1 in.) per minute moved downward towards the surface of the napkin. A force of 12.2 kg is required to apply the bandage to bend away 1.27 cm (1/2 in.)

Tabel

Influence of the plasticizer on the bending of the plasticized Tie. Required strength

Bending force,

Product according to
Examples Mr. Plasticizers 1 Pinacol 9 none 10 Trimethylol
propane*

12.2 43.0 17 * 2

* Trimethylolpropane is used as an example of a polyol that no ditert-glycol is used.

The lower the deflecting force, the better the napkin adapts to when wrapping. The bandage containing Pinacol only requires 12.2 kg for distraction, while a pad without plasticizer takes 43 kg. One using the best plasticizer identified (trim, .thylolpropane) requires. a Force of 17 kg. The 4.8 kg difference between sanitary napkins plasticized with pinacol and trimethylolpropane is considerably. Therefore, the pinacol bandage proves to be more flexible for the swaddling person.

809849/0912

Claims (24)

DIPL.-ING. HANS W. Ga OE NINO PATENTAWALT O Q O O O / Λ J / J 10-146 Jchnscn & Johnsen 501 George Street, New Brunswick, New Jersey, U.S.A. Orthopedic bandages and their use in the manufacture of "rigid orthopedic bandages" 1. Orthopedic bandage, which has a flexible carrier and an adhering bandage-forming mass, thereby gefcennz that the bandage-forming mass comprises a hedox catalyst system, which comprises a copper-containing compound in combination with a! Reducing agent, and a solid, water-soluble vinyl monomer, which means of the redox catalyst system is polymerizable, contains. 2. Bandage according to claim 1, characterized in that the monomer of diacetone acrylamide, BT isopropyl acrylamide or mixtures thereof. 809849/0912 -.- X SIKBERTSTH. * · 8000 itÜHCHKN β «· POB 8 ·· S40 · KlBIt: HHEINPATENT · TEL ·. (089) 4710 79 · TELEX 3-2263 » 3. Tie back. Claim 2, characterized in that that the monomer consists of diacetone acrylamide ". 4 ·. A bandage according to claim 1, characterized in that that the copper-containing compound of copper (II) acetylacetonate "consists. 5. A bandage according to claim 4, characterized in that the reducing agent consists of iron (II) sulfate,
Sodium sulfite, sodium dithionite, iron (II) chloride, sodium formaldehyde sulfoxylate, oxalic acid, cobalt (II) chloride or
Hydrazine consists. 6. Sanitary napkin according to claim 1, characterized in that the flexible carrier consists of a pseudo-leno fabric, which consists of a yarn with an original module
greater than 350,000 kg / cm (5,000,000 lbs./in.). 7. A bandage according to claim 6, characterized in that that the flexible carrier consists of fiberglass fabric. 8. The napkin according to claim 7 »characterized in that the woven fabric groups of 3 or more chains or weft threads are interwoven i which together such that the threads of each group easily come together in a bundle, while being separated from adjacent groups by that the last thread of a group and the first thread of the next group in directly opposite arrangement
are intertwined. 9. A bandage according to claim 8, characterized in that that the fabric has groups of 3 warp yarns. 809849/0912 10. A bandage according to claim 9, characterized in that the fabric consists of an open fabric with holes measuring 1.27 to 3 * 81 mm (0.05 to 0.15 in.) in the chain direction and 0.64 to 2.54 mm (0.025 to 0.10 in.) In the weft direction. 11. A bandage according to claim 10, characterized z shows that the yarn is a multi-filament yarn, the individual filaments of which have a diameter of 0.0038 to 0.0091 mm (0.00015 to 0.00036 in.) and that has 50 to 25OO filaments. 12. A bandage according to claim 11, characterized in that the fabric 20 to 30 chains per 2.54 cm (1 in.) And 10 to 18 shots per 2.54 cm (1 in.). 13. A bandage according to claim 12, characterized in that the yarn is 0.5 to 1.0 twists per 2.54 cm (1 in.) 14. A bandage according to claim 1, characterized in that it is 0.01 to 0.10 percent by weight the compound containing copper. 15. A bandage according to claim 1, characterized in that that the amount of the bandage-forming mass is 200 to 500 percent by weight, based on the flexible Carrier, and the monomer 50 to 80 percent by weight of the compound-forming mass. 16. A bandage according to claim 1, characterized in that the compound-forming mass is a 1,2-di-tert-glycol contains. 809849/0912 - Zj. _ 17 · Sanitary napkin according to claim 15 »marked thereby shows that the 1,2-di-tert-glycol is pinacol. 18. A bandage according to claim 17i, characterized in that that it contains 0.2 to 10 percent by weight pinacol. 19 · Use of the bandage according to claim 1 for the production of a rigid orthopedic bandage for parts of the body, characterized in that the flexible carrier on which a solid, water-soluble vinyl monomer, which is polymerizable in the presence of water by means of the Eedox catalyst system containing a copper compound is, adheres, with water in the presence of the copper compound-containing Eedox catalyst system in Bringing contact, wrapping the flexible carrier around the body part and allowing the monomer to polymerize « 20. Embodiment according to claim 19, characterized in that that the monomer consists of diacetone acrylamide, N-isopropyl acrylamide or mixtures thereof. 21. Embodiment according to claim 20, characterized in that that the copper-containing compound consists of copper (II) acetylacetonate. 22. Embodiment according to claim 21, characterized in that that the flexible carrier consists of fiberglass fabric. 23. Embodiment according to claim 22, dadurchgekennz calibrates that the bandage contains 0.01 to 0.10 percent by weight of copper (II) acetylacetonate and the amount of 809849/0912 bond-forming mass 2CXD Ms 500 percent by weight, based on the flexible support, and the monomer 50 bis 80 percent by weight of the compound-forming mass. 24. Orthopedic bandage which contains a flexible carrier with a bandage-forming compound adhering thereto, characterized in that the bandage-forming compound contains a redox catalyst system and a vinyl monomer which is polymerizable by means of the redox catalyst system, the vinyl monomer from diacetone acrylamide, N. Isopropyl acrylamide or mixtures thereof, and the flexible backing consists of a pseudu-leno fabric formed from a yarn whose original modulus is more than 350,000 kg / cm ² (5,000,000 lbs./in. ² ). 809849/0912