Using fine-distributed metal particles in material, skin patch and orthopaedic product

FIELD: medicine.

SUBSTANCE: invention refers to an orthopaedic product and an orthopaedic pad, particularly an amputation stump pad, a contact pad, a prosthesis cover, an orthesis cover, a prosthesis collar, a shoe sole or orthopaedic socks, i.e. polymer materials used in direct skin contact. The polymer material is applicable for direct skin contact and contains a fine-distributed silver as an antibacterial agent and is additionally provided with fine-dispersed particles of other metal. The metals of the group containing aluminium or aluminium alloy, magnesium, bronze, titanium and/or platinum are applicable.

EFFECT: invention enables concealing the discoloration when using the orthopaedic pad on the skin, and hence when using the orthopaedic product provided with this pad, also including for masking the discoloration in the pigmented or coloured polymer materials applicable in air or skin contact.

7 cl, 1 tbl

 

The invention relates to masking the color change material for use in air or in contact with the skin, in particular under the action of sweat, especially in the material, which itself is not a metal and should not have significant electrical conductivity and which is intended for use in direct contact with the skin of the user. The invention also includes methods of use of these materials in different overlays on the skin and strips, as well as in orthopedic products.

It is known that polymeric materials change color under the action of UV radiation, and also by various environmental influences such as contact with biological fluids and then when used in contact with skin. Especially the yellowing of white or light colored polymeric materials.

Yellowing and discoloration occurs, for example, in orthopedic pads, especially when they have a light or flesh color. The color change can give a polymer parts dirty and aesthetically unpleasant appearance, so the color change is necessary to avoid or mask.

Often try to hide the color change with a higher content of pigments. However, this causes, as a rule, the deterioration of mechanical properties of polymer parts, to the which strongly depends on the use of medical or orthopedic pads. Therefore it is impossible so to improve the content of pigments or pigments as fillers to help with this, it is possible to completely avoid the color change.

In the standard colors of colored polymer part, due to the absorption of light due to two effects - the desired effect of a color pigment and an undesirable color change, over time, become darker. In addition, masking this color change can be achieved only with the use of a suitable color, which detects the absorption spectrum, which would occur absorption changed color.

Therefore, an alternative, there is a need in the painted plastic parts for medical and orthopedic equipment. As for the medical and special orthopedic needs, necessary numerous polymeric parts that are in direct contact with the user's body. To the stated needs are also different gaskets, part of the orthosis, parts of artificial limbs and other prosthetic facilities.

Further, it is known that in materials add silver to give them antibacterial effect, particularly if the material is available for long and intensive contact with the skin. Adding silver is especially good to use for materials that contact irout with sweat, in order to prevent the formation of odors from the products of bacterial decomposition of sweat, or also in the medical field for dressing products and in the treatment of certain skin diseases such as atopic dermatitis.

It is known that, for example, textiles supply silver threads or containing silver plating. The surface coating can also be provided for refrigerators, kitchen furniture, technical details, which often relate to different people, such as switches or door handles, especially in hospitals. In the case of coatings we can talk about thin oil or polymer films. Also known antibacterial enamel coating and ceramics, as well as containing silver polymers for use in medical and orthopedic engineering.

Antibacterial action of silver is credited with silver ions, which are easily formed when skin contact with liquids skin and sweating. During use, the silver is partially oxidized. When used in contact with the skin is formed of black sulphide of silver, which often makes supplied by silver product unattractive. Therefore, equipped with silver textiles and polymers preferred grey, anthracite and black color, the application of which is not evident formed oxide or Sul the feed of silver. However, there are problems with light or flesh-colored rubber or polymeric coating, for example, in the field of orthopedic prostheses and other orthopedic support tools.

As the connecting means and the gasket between the stumps of limbs and in contact with them parts of prostheses used, for example, so-called liners, which are made from soft, stretchy polymers (plastics, Homo - or copolymers, polymer blends, rubber-like materials). Including in the sale are silicone liners and polyurethane liners. While silicone and polyurethane materials, including silicone and polyurethane polymer gels are transparent and only using pigments made of optically opaque or colored. Because of the large influence of sweat and, in General, biological fluids polymeric materials used in medical orthopedic area, quickly become unattractive that, in particular, is also highly water-resistant polymeric materials and polymeric gels. Against the inevitable changes color pigmented or dyed polymer materials still helped only the strong pigmentation and colouring in a suitable light areas absorbed in what I am. However, for technical reasons, the high content of dye and pigment additives is often undesirable, as it can clearly be worse physical and mechanical properties that are required for the desired action items. If these liners add silver fine way of mixing with the polymer material, these liners, despite the pigmentation, due to the impact of sweat quickly become unattractive. Against this helps only painting in grey, anthracite or black color, which is often undesirable.

At the heart of this invention lies task to avoid changing the color of dyed or pigmented polymer parts or better to mask or, in particular, for materials that are intended for use in direct contact with the skin of the user and as an antibacterial agent contained some finely distributed in the silver material, to ensure that the product over a long period of use remained optical virtually unchanged and attractive and at the same time without deterioration of the material properties.

This task is solved by the use of finely distributed metal particles according to claim 1 claims, as well as using the material according to claim 8 of the formula from which retene, pads on the skin according to item 13 of the claims and orthopedic products according to 14 of the claims.

In General, the invention describes a method of applying a finely distributed metal particles, in particular from the group consisting of aluminum, magnesium, zinc, bronze, titanium and/or platinum in the material, preferably polymeric material, which may contain silver as an antibacterial agent for masking discoloration or, respectively, the change in color of silver for use on air or in contact with skin.

Are preferred field of application as a patch on the skin or orthopedic pads.

Under "pillowtop pad" in this document see any used in orthopedic technique gasket including a gasket used for medical purposes. In case of such strips are talking primarily about the spacers in various forms, for example, can also be glued to the skin in order at some point in the body to provide a cushioning effect, of coatings for prostheses, the strips for braces, boots, dentures, inlays dentures, insoles for shoes, orthopedic boots and shoes in General and orthopedic polymer stockings.

The strip at least on one side may be to include atrina textile surface or coating on one or both sides.

Particularly preferably, the materials according to the invention for liners for stump or liners for the stump of the limb or prosthetic spacers in the form of inserts for the die. Liners for stumps provide depreciation at the transition between the stump and the anchorage of the prosthesis, in particular uppers denture, and consist primarily of polymers, elastic materials, which according to the invention additionally add metal particles and, optionally, silver. Further, the liners may be provided for connection to a prosthesis in the form of a rigid mounting, valve mounting, etc. Above facts known to specialists in this field and does not require more detailed description in this paper. Further, the liners on the one hand provide a textile surface or on two sides (i.e., either only to face the skin of the hand, or only with reversed from the skin side, or both sides) cover the floor. In the case of coatings it may be preferably about spraying a thin layer, such as CVD deposition. In the case of material for liners to stump it is preferably about homopolymer or copolymer materials or mixtures of several polymeric materials. Polymeric materials for liners are preferably elastic, Yes is it preferably the gel and depending on the applications have special mechanical properties.

Along with pads for the stump, especially suitable to be performed according to the method according to the invention, are the following orthopedic pads: orthopaedic contact pads General purpose coating for dentures, gaskets for orthoses, prostheses, the details of the orthopedic fixation devices, insoles for footwear or orthopedic polymer stockings, which are used similarly jerseys as pads to put on orthopedic support equipment or prosthetic devices.

In General, the invention also includes the use of orthopedic pads according to the invention in a composite orthopedic products or, respectively, for orthopedic products, orthopedic products, which are equipped with gaskets according to the invention.

In the case of metals, which are used in addition to silver or no silver, we can talk about metals in nanoscale, colloidal or powder form, the form of fine granules, plates or flakes, shavings or fibers. Common commercially available metal powder is also suitable for the present invention. The respective powders, for example, can also be used in jewelry or in lakokrasochn the th industry. In General, the particle sizes are in the range from 1 to 100 μm, in the case of a plate shape and nanoscale particles of at least the thickness of the particles is in the range from 0.1 ám.

According to the method according to the invention applied metal particles do not form iron oxides or sulfides, and the resulting metal coloring effect is almost not changed during use data obtained from materials of products. Unexpectedly it was found that, compared with pigments as the primary means against yellowing need a much smaller number of particles to achieve the effect of opacity than the required content of the pigment or colouring matter, and it is only 5 to 10%, in order to sufficiently achieve the masking color change, in particular changes in color of silver, in contact with skin of the user and then. It is preferable to use particles of aluminum or aluminum alloys. The coloration of polymeric materials at the same time the metal particles and the coloring or pigment particles allows for greater effect. Very nice optical effect also reach when using translucent pigments in combination with metal particles according to the invention.

Preferably the metal content, i.e. the proportion of metal particles to the total mass, and in the presence of silver, in addition to the silver content should be at least 0.01% wt., further, preferably at least 0.1% of the mass. and in particular at least 0.5% wt. Amount up to 1% of the mass. or, at most, 3% of the mass. enough to achieve the desired effect. Antibacterial containing silver materials (polymer and textile) applied silver amount is preferably from 0.01% by mass. up to a maximum of 0.1% of the mass.

A significant advantage of the invention in its application in polymer materials is that for staining requires fewer additives, if used pigments/dyes and metals than when using only pigments or dyes. If necessary, it is also possible to completely abandon the use of pigments and dyes.

Following an even more important advantage is that the additive metals in such small quantities practically no influence on the mechanical properties of the polymeric parts that, in particular, has implications for the gel and soft polymeric materials. For functional products, whose properties are determined by the material properties, the specified property is especially important. That polymer gaskets, which are used in medicine and orthopedic the technique, details of the orthosis, the details of the supporting devices and similar products must have certain elastic properties, strength, flexibility, etc. and, if necessary, also be anisotropic, and the filler should not affect these properties.

An additional advantage of this invention is that the polymeric material receives a silver or bronze tint and with this optical properties that are very attractive. This quality is especially pronounced when the simultaneous presence of colored pigments except black and white and translucent pigments.

In addition, it was found that the metallization, if necessary, in addition to silver, may cause the user a positive effect in relation to neuralgic pain and phantom pain. This effect can be explained by the capacitive effect of the applied metals.

In General, when applying the present invention in the products, which also contain silver, unexpected was that even with the moisture-permeable and able to swell the polymer and textile materials definitely not formed any local members. It is assumed that the elements that are in a range of voltages lower than silver, such as, for example, aluminum, reduces the formation of ions with the ribs, which should provide antibacterial action and thus this action makes minor. Elements in the row voltages above silver, can, on the contrary, too quickly oxidize and as a consequence to save silver. However, neither was found experimentally, does not occur. The concentration of silver and silver remained, when conducting a test on swelling containing silver materials. Thus, containing silver silicone gaskets that one week was in saline solution, not detected loss of silver and the conductive ability. Thus, there is no fear that the materials according to the invention will lose its effect when in contact with liquids leather or later. The above-mentioned advantages, respectively, do not confront any disadvantages additives other metals.

As the base material, which is optionally mixed with silver and an additional metal, which should act primarily as a metal dye, among other suitable polymers (natural or synthetic), that is, polymeric materials of all kinds, rubber, latex, gutta-percha) and textiles (natural fiber and nonwoven fabric of synthetic fiber and non-woven materials), and other mA the materials, they are metal and are preferably not electrically conductive or not conductive to a significant extent, for example, ceramics.

Especially suitable for use with polymeric materials are polymer or copolymer elastic materials, soft polymer materials or polymer gels.

Especially preferred is the material according to the invention, which is intended for use in direct contact with the skin of the user and contains a number of finely distributed in the material of silver as an antibacterial agent, along with silver the material contains a number of finely distributed in the material of a metal from the group consisting of aluminum, magnesium, zinc, bronze, titanium and platinum, separately or in combination, preferably aluminum or aluminum alloy.

In General, this invention also includes pads on the skin of the material according to the invention. Thus we can talk about any patch on the skin, which is also according to the prior art is equipped with a silver, in particular about the contact linings, coatings for prostheses, details of products, parts, support, textile lining, such as elastic bandages, pads for amputation stumps, tops prostheses, established the s for prostheses and the pads on the skin for insulation. Especially preferred is the use of the materials according to the invention for gaskets for amputation stump or, respectively, cover the skin in the form of strips for amputation stump.

Further, the invention includes a prosthetic device material according to the invention as a gasket or insulation material, in particular for orthopedic needs, and, further, includes the use of this material for mounting and supporting devices for the human body, orthoses and parts of the orthosis, molded boot tops, textile coatings and impregnations for textiles.

The following products should be produced from or with the use of the material according to the invention are insoles, upholstery for chairs, wheelchairs and beds, armrests, medical stockings and socks.

Hereinafter the invention is described in detail by means of examples that serve to illustrate and not limit the invention in its versatility.

The following formulations of the polymers was used as the base material. To the base material or the core material was added silver in the desired form and/or optionally at least one metal from the group consisting of aluminum, magnesium, zinc, titanium, platinum or bronze. Silver was added to all materials/samples in the form of commercially available additives with what uranium silver 1.6% wt., in the amount of 0.6% of the mass. with respect to the base material.

I. as the basis of material fit for use, for example:

1) silicones:

RTV silicone gels (two-component gels polyaddition), for example, Rhodia® 4411 or 4420, if necessary, mixed with from 1 to 15% of the mass. silicone fluids or silicone oil.

Suitable formulations for silicone materials are, in particular:

Rhodia® 4411 100:12

Rhodia® 4420 100:10

Rhodia® 4420 100:10 with 5% silicone fluid of 0.65 cSt (mm2/s)

Dow Corning Silastic® T2 100:10, with or without 10% Dow silicone oil 200 (350 cSt (mm2/s))

Wacker Elastosil® RTV 4644 100:10 or 15% of a silicone oil (Wacker AK 1000,

each, mixed optimally with from 0.05 to 0.15% of the mass. the Al powder.

2) Polyurethane:

Polyurethane from polyetherpolyols with aliphatic isocyanate 100:13; from 0.1 to 0.5% Coscat® catalyst, reducer viscosity BYK A 535; or Conathan 401 TU with TU 810 100:51,

each, mixed optimally with from 0.05 to 0.15% of the mass. the Al powder.

3) Block copolymers:

SEBS:

15-30% Kraton 1651G, from 60 to 75% of the honey. vaseline oil, 0-1% of antioxidant, 0-25% reducer viscosity (for example, washing the gasoline).

SEEPS:

10-20% Septon 4044, 70-80% honey. vaseline oil, 0-1% of antioxidant, 0-20% reducer viscosity (for example, the flushing gas),

each, mixed optimally with from 0.01 to 0.2% of the mass. the Al powder.

II. The following formulations of comparative ISM is rhenium effect pigments and metal powders on the mechanical properties. The results are presented in table 1.

(Base material with the addition of silver as above)

Formulation A: Rhodia 4411 100:12 (standard, without metal, without pigment)

Formulation B: Rhodia 4411 100:12 with 1% of the mass. colour pigment Elastosil FL

Formulation C: Rhodia 4411 100:12 with 3% of the mass. colour pigment Elastosil FL

Formulation D: Rhodia 4411 100:12 0.1% of the mass. the Al powder

Recipe A
(standard)
Recipe
(1% pigment)
Recipe
(3% pigment)
Formulation D
(0,1%
powder (Al)
Tensile strength (N/mm2)1,361,451,201,41
Ultimate elongation (%)522539480585
400% tension
(N/mm2)
0,85720,85780,90170,7184
Tear resistance (N/mm)7,12 7,466,907,86
Factor1,591,691,331,96

Consideration of the results of comparative tests:

Formulation B contains 1% of the mass. colour pigment that can be considered as the lowest necessary concentration for overlap (weak) resulting from silver grey shade. With a strong colour change which may occur upon contact with sulfur compounds, based on silver, the gasket requires a much greater concentration of the coloring matter, at least 3% (see formula (C). In both cases, formulations B and C, use the same color pigment gray. Visually set the opacity of 0.1% of the mass. aluminum powder in the sample formulations D approximately corresponded to 3% of the mass. colour pigment in the formulation C.

From the data given in the table, it is necessary that the metal powder is not strongly deteriorates the mechanical properties. Therefore, the use of metal powder from the viewpoint of optical properties, as well as other material properties can be considered very desirable.

All formulations you can use commercially available metal powders, the cat is that used in industry printing inks, or in the paint industry or electroplating.

All color effects and mechanical properties correspond to the same recipe, but without the silver content. From visually set the opacity should be reliable overlay color change of the polymer material due to contact with skin and, in particular, because of the sweat.

1. Orthopedic strip, in particular, the gasket for amputation stump, contact layer, a coating for a prosthesis, gasket orthoses, ankle prosthesis, insole for shoes or orthopedic stockings, with a polymeric material that contains silver as an antibacterial agent and in which the metal particles, in particular from the group comprising aluminum or aluminum alloy, magnesium, bronze, titanium and/or platinum, finely dispersed in order to hide the color change when using orthopedic pads on the skin.

2. The gasket according to claim 1, in which the specified element at least one side provided with a textile layer or with one or both of the parties has the floor.

3. The gasket according to claim 1, in which the metal particles to mask the color change are in the form of powder particles, thin shavings or fibers.

4. The gasket according to claim 1 in which the polymeric material comprises a polymer or copolymer of an elastic material, soft the CSOs polymer material or polymer gel.

5. The gasket according to claim 1, in which the metal in addition to silver is in the form of powder particles, thin shavings or fibers.

6. The gasket according to claim 1, in which the content of metal in addition to silver is at least 0.01 wt.%, preferably at least 0.1 wt.%, more preferably at least 0.5 wt.%.

7. Orthopedic products, orthopaedic gasket according to any one of preceding claims 1 to 6.



 

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13 cl, 2 dwg, 3 tbl, 10 ex

FIELD: chemistry.

SUBSTANCE: polymer composition contains low-molecular weight dimethylsiloxane rubber STKN as a base, a cold curing catalyst K-68, radio carbonyl iron P-10 as absorbing filler, additionally a solution of high-molecular weight rubber SKT in liquid polymethylsiloxane and tetraethoxysilane or derivatives thereof, as well as polyethylene polyamine as a curing rate controller. When producing the polymer composition, carbonyl iron is first bound with low-molecular weight rubber SKTN in a mixture with derivatives of tetraethoxysilane and liquid polymethylsiloxane (component A). The mixture (component A) is held for at least 24 hours. The rubber SKT is bound with another portion of the liquid polymethylsiloxane and tetraethoxysilane derivatives (component B) and also held for 24 hours. Component A and component B are mixed with each other immediately before adding the catalyst. The amount of catalyst K-68 or mixture thereof with polyethylene polyamine determines the overall rate of cure and controlled time of loss of fluidity of the composition.

EFFECT: obtaining a polymer composition with absorbent properties with small layer thickness, having sufficient strength and elasticity of the vulcanisate in a wide temperature range, shorter curing time and enabling control of the rate of cure.

2 cl, 4 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: invention relates to production of packaging materials (packaging walls and packaging articles) for food products and specifically relates to an oxygen-absorbing mixture used as an oxygen absorbent in food packaging, a composition containing a polymer resin and said oxygen-absorbing mixture and an article - packaging. The oxygen-absorbing mixture contains (I) an oxidisable metal component, (II) an electrolytic component selected from a group consisting of KCl and CaCl2, and (III) a non-electrolytic oxidising component. The mixture also contains a water-absorbing binding agent, e.g. zeolite, graphite, soot or clay. The composition used to make packaging articles contains a polymer resin, e.g. an olefin homo- or copolymer, polyamide (co)polymers, said oxygen-absorbing mixture and an optional additive selected from a group comprising UV absorbents, antioxidants and other light stabilisers. The packaging article is a film, a sheet or layered material.

EFFECT: invention increases oxygen absorption activity of packaging materials, eg films, the oxygen absorbent has excellent longevity.

14 cl, 2 tbl, 8 ex

FIELD: chemistry.

SUBSTANCE: invention relates to multilayer films, having an active oxygen barrier and can be used for packaging using an autoclave. The film contains at least one active oxygen barrier layer which contains a mixture of thermoplastic resin (A), transition metal salts (B) and an oxygen barrier polymer (C), and a layer which contains an iron-based oxygen-binding composition. The film has oxygen binding rate of at least approximately 0.01 cm3 oxygen per day per gram of the oxygen-binding composition.

EFFECT: invention enables to produce sealed packaging from a film with inside oxygen concentration of about 0% after 35 days of storage in relative humidity of 75% and temperature 75°C.

11 cl, 2 tbl, 14 ex

FIELD: chemistry.

SUBSTANCE: polyester composition contains a polyester polymer, having repeating alkylene arylate links, aluminium atoms and catalytically active titanium atoms. The polyester polymer has characteristic viscosity of at least 0.72 dl/g and residual content of acetaldehyde in polymer particles of 10 ppm or less. Aluminium atoms are residues of an aluminium compound of formula: Al[OR]a[OR']b[OR"]c[R'"]d, where R, R', R" denote an alkyl, aryl, acyl group or hydrogen, and R'" is an anionic group. The method of producing polyester polymers involves adding phosphorus atoms to molten polyester containing aluminium atoms and additional atoms of an alkali-earth metal or atoms of an alkali metal or residues of alkaline compounds, and catalytically active titanium atoms. Phosphorus atoms are added to the molten polyester before or after meeting conditions a), b), c), d), e) and f), given in the claim, but before the molten polyester solidifies.

EFFECT: improved method.

35 cl, 10 tbl, 6 ex

FIELD: process engineering.

SUBSTANCE: invention relates to powder metallurgy, namely, to thermoplastic powders for thermoplastic forming. Proposed material contains up to 40-70 vol.% of sintering powder metal or metal alloy (A), or mixes thereof, up to 30-60 vol.% of binder (B) consisting of 50-96 wt % of one or several homo- or copolymers of POM; 2-35 wt % of one or several polyolefins; 2-40 wt % of poly-1,3-dioxetane or poly-1,3-dioxiane, or mixes thereof. Note here that sum of wegith percentage of binder components makes 100% and 0-5 vol.% of dispersing agent (C). This material is produced by fusing component B at 150-220°C and adding component A, if required together with component C, into flow of component B melt at the same temperature, or by fusing component B and C in presence of component A at 150-220°C. Then, obtained material is formed, binder is removed in gaseous oxygen-containing atmosphere at 20-180°C for 0.1-24 h, heated to 250-600°C for 0.1-12 h and sintered.

EFFECT: higher strength.

10 cl, 3 tbl, 7 ex

FIELD: chemistry.

SUBSTANCE: elongated flexible modules have various applications, for instance, in bearing elements of lifting or cable devices, drive belts for mechanical devices such as, for instance, passenger conveyor or railings for passenger conveyors. Elongated bearing module in form of flat belt for transmission of tractive effort, combined for bearing load suspended by means of said bearing modules, includes: multitude of elongated elements, working for stretching, which support load in longitudinal direction along said elements, working for stretching; and envelope, transmitting tractive effort to multitude of elongated elements, which work for stretching, covering at least part of said multitude of elements, working for stretching, with envelope containing thermally plastic polymer material and melamine-based adhesion intensifier, added into thermally plastic polymer material, which improves adhesion between said multitude of elements, working for stretching, and envelope.

EFFECT: invention makes it possible to increase module strength due to increase of effort required for disconnection of material of envelope and elements.

11 cl, 7 dwg

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