JPS649864B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a medical material for trauma, and more particularly to a medical material for medical trauma that satisfies the contradictory requirements of coverage that completely protects the trauma and permeability that allows gas to escape from the trauma. Materials (materials like bandages)
Regarding.

The present invention provides a multi-layered dressing useful for the treatment of open injuries such as pressure sores. A problem associated with the treatment of certain types of injuries, particularly ulcerated skin wounds, is the need to protect the injury and substantially eliminate the odor of the gaseous bodies emanating from the traumatized area without interfering with their permeability. We are faced with the problem of having to resolve the conflicting requirements of both removal and provision of easy coverage.

The multi-layered bandage of the present invention includes at least three layers: a layer of material that has healing and absorbent properties in contact with the wound, a layer of deodorizing material, and a flexible outer layer that retains the bandage on the body surface.

Examples of bandages within the scope of the invention are shown in the accompanying drawings. 1 is an exploded perspective view of a multilayer bandage of the present invention; FIG. 2 is a perspective view of the bandage of FIG. 1 applied to a wound; FIG. 3 is an enlarged perspective view of one embodiment of layer B; 4 is an enlarged perspective view of another embodiment of the B layer, FIG. 5 is an enlarged perspective view of another embodiment of the B layer, and FIG. 6 is an enlarged perspective view of a multilayer bandage according to another embodiment of the present invention. It is an exploded perspective view.

The present invention is directed to multi-layer trauma medical materials or dressings. Such a medical material (or bandage) includes a layer of material that has a healing effect and absorbent properties in contact with the wound, a layer of deodorizing material and a flexible outer layer for retaining the entire medical material on the body surface. .

Each figure shows a layer of material with therapeutic and absorbent properties.
Shown as layers. Layer B is either formed into a complete shape as a layer 11 of homogeneous cohesive mass as shown in FIGS. 1 and 2, or as a homogeneous cohesive mass with a supporting coating 12 as shown in FIG. layer 1
1. A layer 11 of homogeneous cohesive mass with a polymer foam intermediate layer 13 with semi-open cells as a support and optionally an outer polymer coating 14 as shown in FIG. 4, or as shown in FIG. It can be formed as a foam layer 15, which has therapeutic and absorbent properties and may optionally have a support coating 16.

Layer B has a homogeneous mass or foam with curative and absorbent properties and a number of pores 20 opening through the optional support. The holes 20 may be formed as regular shapes or may be randomly provided. The ratio of the surface area of layer B to the surface area of the pores can vary from about 1 to 2:2 to 1, but is preferably about 1:1. The holes can be punched through the B layer or formed by a molding operation of the mold. The shape and size of the B layer is not critical and need not be specific. The shape of layer B is preferably circular in order to treat trauma in various parts of the human body, such as the elbow or heel, but is more preferably rectangular (including square) as shown in the drawings. The thickness of layer B can vary from about 1 to 4 mm, and the diameter of the pores from about 2 to 4 mm.

The layer 11 of homogeneous cohesive mass consists of a mixture of one or more water-soluble or water-swellable hydrocolloids and a natural or synthetic viscous substance that acts as a binder for the hydrocolloids. Hydrocolloids are present at about 30-70% by weight of the mass. Suitable hydrocolloids include pectin, gelatin, karaya gum, guar gum, locust bean gum, sodium carboxymethyl cellulose, etc.
20% by weight of one or more therapeutic hydrocolloid substances such as pectin, gelatin or karaya gum. Suitable viscous materials (binders) include natural rubber, silicone rubber, acrylonitrile rubber, polyurethane rubber or polyisobutylenes, such binders having a cohesive mass of about 30%
~70% by weight is present. Plasticizers, antioxidants or pharmacologically active substances (e.g. antibacterial agents) are included in the cohesive mass in an amount not exceeding about 5% by weight, and viscosity enhancers (e.g. fibrous cotton, finely ground Wood cellulose or microcrystalline cellulose) may be included in the cohesive mass in an amount not exceeding about 10% by weight. layer of homogeneous cohesive mass 11
This includes about 20% pectin, about 20% gelatin, and about 20% sodium carboxymethyl cellulose.
% and about 40% by weight polyisobutylene.

The support coating 12 shown in FIG. 3 is retained on the surface of the layer 11 of homogeneous cohesive mass that does not come into contact with the wound. Support coating 12 may be a thin sheet of polymer such as polyethylene, polypropylene, polyvinyl chloride, or the like.

As shown in FIG. 4, the cohesive mass layer 11 can also have a semi-open celled polymeric foam layer 13 held securely on the non-traumatic surface. The foam can be made from a variety of elastomeric materials such as polyester or polyether polyurethane foams, styrene-butadiene foams, or certain rubber-based foams. A preferred foam material is a flexible polyurethane foam having about 50 to 100 cells per linear inch. Semi-open cells refer to cells in which the percentage of open or burst cells is about 30-70%. An outer polymeric coating 14 made of a flexible elastomeric material such as flexible polyurethane, polyacrylate, polyethylene, etc.
can be reliably held in the foam layer 13. Instead of providing an outer coating 14, a foam layer 13
The seal can be sealed by flame treating or scorching the outer surface.

The layer 11 of homogeneous cohesive mass with healing and absorbent properties is disclosed in U.S. Pat.
It can be produced by the method disclosed in No. 4192785 (inventor: Chien et al.). For example, mixing the hydrocolloids and any optional ingredients (preferably in finely divided form) and gradually adding the mixture to the viscous material in a kneading mixer until a homogeneous mass is formed. A layer 11 of cohesive mass can be produced. The support coating 12 or the semi-open cell foam 13 and coating 14 are then firmly held and punched out to form the holes 20.
to form. Alternatively, the pores 20 can be formed by forming a homogeneous mixture of hydrocolloids and binder prior to setting.

The layer B of healing and absorbent material may also be a foam layer 15 as shown in FIG. The foam may be prepared by hot air drying or lyophilization of an aqueous foamed colloidal dispersion of one or more hydrocolloids such as pectin, gelatin, karaya gum, guar gum, locust bean gum, sodium carboxymethylcellulose, etc. I can do it. However, this colloidal dispersion contains at least about 20% by weight of pectin.
One or more therapeutic hydrocolloid substances such as gelatin and gum karaya. Such foams are disclosed in patents such as US Pat. No. 2,465,357, US Pat. No. 2,558,395 and US Pat. No. 3,767,784. Preferably, the foam is made from a mixture of gelatin, pectin and sodium carboxymethylcellulose. This preferred foam contains pectin and sodium carboxymethyl cellulose at about 10%
~50% by weight and about 20-80% by weight of gelatin, and the hydrocolloids are dry mixed in water to form a colloidal dispersion containing about 1-20% by weight of solids. Preferred foams can be produced by adding the dry mixture with stirring, foaming the resulting colloidal dispersion to increase its volume by about 10-60%, freezing, and then subjecting it to lyophilization.

An optional support coating 16, comprised of various polymeric materials such as polyethylene, polypropylene, polyvinyl chloride, etc., ensures that it remains on the surface of foam layer 15 free from trauma contact.

The layers of substances having a deodorizing effect are the first, second and sixth layers.
In the figure, it is shown as layer D. This deodorizing layer D is composed of an air-permeable fabric or nonwoven fabric that retains or is filled with a deodorizing substance. As a form of suitable material,
Expandable nonwoven sheets of synthetic polymeric materials (eg, polyurethane) may be mentioned that carry a large amount of activated carbon particles dispersed over a single major surface. Preferably, the activated carbon particles are bound to the upper surface of the D layer, ie the opposite surface away from the B layer, and the surface of the D layer in contact with the B layer is coated with an adhesive layer. Such materials are available commercially under the trade name Bondina. As a suitable other form of deodorizing material, British Patent No. 1301101
(Inventor: Beiley).

As shown in FIG. 6, an intermediate layer C can be present between the deodorizing layer D and the healing and absorbent layer B to be included in the medical material within the scope of the present invention. Intermediate layer C is a layer of material, such as a non-woven fabric, that is permeable to air but not permeable to liquid, and functions to prevent leakage of liquid discharged through layer B. However, the gaseous body released from the wound passes from the C layer to the D layer, and at that time the gaseous body is deodorized. Layer C can be coated on one or both sides with a microporous pressure sensitive adhesive.

The outer layer of the dressing of the present invention is shown as layer E in FIGS. 1, 2 and 6. This E-layer is a breathable flexible adhesive tape that allows air and gas permeation.
The E-layer consists of a porous fibrous nonwoven or polymeric support with a microporous pressure-sensitive adhesive layer on the bottom surface. The size of the E layer extends beyond the periphery of the B, D and C layers so that it can hold other dressing materials. The bandage material can be held on the human body surface by pasting silicon release paper, for example, on the bottom of the B layer and the protruding portion of the E layer. Examples of suitable materials for the E-layer include U.S. Pat.
No. 3121021 (inventor: Copeland)
and No. 3645835 (inventor: Hodgson). Alternatively, adhesive coatings using hydrocolloids containing pressure sensitive adhesives (as disclosed by Copeland) such as those disclosed in the Chien patent may be used. The E layer allows the gas deodorized in the D layer to pass through and diffuse into the atmosphere. The E layer also allows the bandage to be applied to the patient and to provide sufficient coverage of the wound surface to protect the wound.

The medical material of the present invention can be used on a patient by placing a bandage strip of its original size sufficiently covering the wound so that its B layer is in contact with the wound. On the lower surface part of the medical material of the present invention,
In short, the hydrocolloid-containing adhesive mass disclosed by Chien in U.S. Pat. No. 3,339,546 and Steinhardt in U.S. Pat. No. 3,029,187.
Wounds can be packed with hydrocolloid powder, karaya gum, or other therapeutic agents as disclosed by . This packing is shown in FIG. 2A. The medical material of the present invention can be replaced on a periodic basis to keep the wound covered until the treatment is complete.

[Brief explanation of drawings]

The drawings all relate to the bandage of the present invention, and Fig. 1 is an exploded perspective view of the bandage, Fig. 2 is a perspective view of a bandage applied to a wound, and Figs. 3, 4, and 5 are B of each bandage. Enlarged perspective view of layers, No. 6
The figure is an exploded perspective view of another bandage. B...Absorption layer, D...Deodorizing layer, E...Outer layer, 1
1... Cohesive mass, 12 and 16... Support coating, 13... Foam intermediate layer, 14... Outer coating,
15... Foam layer, 20... Hole, A... Packing, C... Intermediate layer.

Claims (1)

[Scope of Claims] 1. A layer of a material having healing and absorbing properties and having a large number of pores, a layer of a deodorizing material that permeates air, and a layer of a material for reliably retaining medical materials for trauma to the human body. It consists of a flexible outer layer that retains the adhesive covering and is permeable to air, the layer of healing and absorbent material being selected from pectin, gelatin, karaya gum, guar gum, locust bean gum and sodium carboxymethyl cellulose. about 30 to 70% by weight of one or more hydrocolloids, with at least about 20% by weight of the homogeneous mass being one or more healing hydrocolloids selected from gelatin, pectin and karaya gum. and an adhesive binder selected from natural rubber, silicone rubber, acrylonitrile rubber, polyurethane rubber and polyisobutylenes.
% by weight, or a foam of one or more hydrocolloids selected from pectin, gelatin, karaya gum, locust bean gum, guar gum, and sodium carboxymethyl cellulose (provided that the foam does not contain gelatin, pectin). and 1 selected from Karaya gum
1. A medical material for trauma, comprising at least about 20% by weight of one or more healing hydrocolloids. 2. A patent in which a layer of homogeneous mass is held by a thin flexible polymer coating glued to its surface not in contact with the wound, and holes are drilled through the homogeneous mass and the polymer coating. Claim 1
Medical materials listed in section. 3. A homogeneous mass layer securely retains a polymer foam layer with semi-open cells on its surface not in contact with the wound, the pores being a homogeneous mass layer and a polymer foam layer. The medical material according to claim 1, wherein the medical material is perforated through the material. 4. A patent in which a foam layer with semi-open cells securely retains a thin polymer coating on its outer surface, wherein pores are drilled through the layer of homogeneous mass, the polymer foam layer and the polymer coating. Medical material according to claim 3. 5. Medical material according to claim 1, wherein the homogeneous mass consists of about 20% by weight gelatin, about 20% by weight pectin, about 20% by weight sodium carboxymethylcellulose and about 40% by weight polyisobutylene. 6. The medical material of claim 1, wherein the foam contains about 10-50% by weight pectin, about 10-50% by weight sodium carboxymethyl cellulose and about 20-80% by weight gelatin. 7. The medical material of claim 1, wherein a thin polymer coating is held securely to the foam layer, and pores are drilled through the foam layer and the coating. 8. The medical material according to claim 1, wherein a layer of fibrous nonwoven fabric that is permeable to air but not permeable to liquid is included between the healing and absorbent layer and the deodorizing layer in the medical material. 9. The medical material according to claim 1, wherein the deodorizing layer is a foamable synthetic nonwoven material that holds a large number of activated carbon particles dispersed over the entire surface of the material. 10. The medical material according to claim 1, wherein the deodorant layer is carbon cloth. 11. The medical material according to claim 1, wherein the outer layer is a porous fibrous nonwoven support having a finely porous pressure-sensitive adhesive coating.