Anti-bacterial medical waterproof material and sheet made of the same
A waterproof material of a circular knitted fabric woven from a first yarn and a second yarn. The first yarn is a nylon filament containing ultra-micro silver ions and the second yarn is a polyester yarn. The fabric is made of approximately 20 to 40% of the first yarn and 60-80% of the second yarn. An antibacterial waterproof sheet has a multilayer construction for controlling bacterial growth, eliminating odor and resisting wear and includes a polyurethane film having an upper and lower side forming an innermost layer. A layer of polyurethane adhesive is disposed on each upper and lower side of the film. A layer of knitted material is disposed on each layer of adhesive forming opposed outer layers of the sheet. The knitted material is woven from the first yarn and a second yarn. The silver powder ions are 1 micron or less.
1. Field of the Invention
The present invention relates to an anti-bacterial waterproof material made of a circular knitted fabric woven with a nylon yarn containing an ultra-micro powder of silver effective in controlling the growth of various bacteria from the moisture associated with patient use, and more particularly, to a medical sheet made of the material of the present invention.
2. Description of the Related Art
As our society ages, the number of the bedridden elderly is increasing annually. Many of these patients require an additional medical waterproof sheet placed beneath their lower back on a bed or other support surface.
Typical waterproof sheets used in medical facilities, such as nursing homes and hospitals are placed in the center of a mattress of a bedridden patient to prevent sweat, bodily fluid and/or waste of the patient from penetrating the mattress or support.
At the core of these conventional waterproof sheets is a polyurethane film to which a fabric is attached. This polyurethane film blocks the moisture of the patient's fluids from penetrating into the mattress or support.
However, these conventional waterproof sheets do not eliminate odor, are not anti-bacterial and are not designed to control the growth of bacteria such as MRSA, staphylococcus aureus, pneumobacillus and E.coli bacteria. See Japanese Unexamined Patent Application 7-39564.
Thus, there is a need for a medical anti-bacterial waterproof material that can be used as a sheet or other item which can control bacterial growth and/or eliminate odor.
SUMMARY OF THE INVENTIONAn object of the present invention is to provide a waterproof material that can be made into a sheet or other product for medical use to eliminate odor and bacterial growth.
Another object of the present invention is to produce a low cost, easily assembled waterproof sheet of a circular knitted fabric woven with a nylon yarn containing an ultra-micro powder of silver ions to control bacterial growth and eliminate odor.
In accomplishing these and other objects of the present invention there is provided a waterproof material comprising a knitted fabric woven from a first yarn and a second yarn, the first yarn being a nylon filament containing ultra-micro silver ions and the second yarn being a polyester yarn. The fabric is made of approximately 20 to 40% of the first yarn and 60-80% of the second yarn.
In accomplishing these and other objects of the present invention there is provided an antibacterial waterproof sheet having a multilayer construction for controlling bacterial growth, eliminating odor and resisting wear, comprising a polyurethane film having an upper and lower side forming an innermost layer. A layer of polyurethane adhesive is disposed on each upper and lower side of the film. A layer of knitted material is disposed on each layer of adhesive forming opposed outer layers of the sheet. The knitted material is woven from a first yarn and a second yarn. The first yarn is a polyester yarn and the second yarn is a nylon filament containing ultra-micro silver ions.
These and other objects, features, aspects, and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiment relative to the accompanied drawings, in which:
BRIEF DESCRIPTION OF THE DRAWINGS
Referring to
The knitted fabric is woven, approximately 20% to 40%, with a first nylon yarn 10 having a length of 70D/24F to 140D/48F. Nylon yarn is desirable because of its hydrophilic properties, improving fluid absorption. Moreover, higher price and health concerns are limited by maximizing the content of the fabric to 20-40% nylon yarn. Use of a nylon yarn in excess of 40% can irritate or damage sensitive skin.
The yarn 10 is shown in
As shown in
The sheet is formed in a continuous motion, for example, by use of a pressure roller and pressure belt. Pressure within the range of 2.5 to 3.0 kg/m2, a heating temperature range of 75 to 85° C., and a speed of 0.9 to 1.0 m/min can be used to form the sheet.
A layer of fabric 20 is disposed on each side of film 18. Due to the multilayer construction, both sides of sheet 20 can be used for convenience, economy and practicality.
Accordingly, the waterproof sheet of the present invention has a multi-layer construction and enhanced resistance to bacterial growth, odor and wear from repeated washing and drying. In use, the sheet will prevent the moisture of sweat, bodily fluids or waste from infiltrating the mattress, futon or other support upon which it is placed.
The properties of the medical waterproof sheet of the present invention has been determined as follows:
-
- Water resistance: 1500 mm or more (JISL 1092)
- Water vapor permeability: 1,000 g/m2/24 hrs or more (JISL 1099)
- Full thickness: 0.5 to 0.75 mm (dial gauge)
- Full weight: 200 to 330 g/m2 (10 cm×10 cm conversion)
- Cleaning: sample sheet withstood 100 washings with water (no dry cleaning)
It should be appreciated that the waterproof sheet 20 of the present invention is not limited to medical applications, be can also be used in other environments and applications. Moreover, a pillow or mattress can be cover on its entire surface with the fabric of the present invention. Other contemplated uses and/or applications for the fabric and sheet of the present invention can include a cover for a stretcher, a pillowcase or protective cover for a carpet/rug to protect the same from moisture and stain.
The fabric and sheet of the present invention is especially effective in controlling the growth of various bacteria, including MRSA, staphylococcus aureus, pneumobacillus and E.coli bacteria. It also prevents odors associated with bacterial growth. Various anti-bacterial tests were conducted.
Note:
□: Required: □: Optional: —: Not applicable
Although the present invention has been described in relation to particular embodiments thereof, many other variations and modifications and other uses will become apparent to those skilled in the art. It is preferred therefore, that the present invention be limited not by the specific disclosure herein, but only by the appended claims.
Claims
1. A waterproof material comprising a knitted fabric woven from a first yarn and a second yarn, the first yarn being a nylon filament containing ultra-micro silver ions and the second yarn being a polyester yarn.
2. The material of claim 2, wherein the fabric is made of approximately 20 to 40% of the first yarn and 60-80% of the second yarn.
3. The material of claim 1, wherein the material has a gauge of 28 to 32 stitches.
4. An antibacterial waterproof sheet made of the material of claim 1.
5. The material of claim 1, wherein the silver powder ions are 1 micron or less.
6. An antibacterial waterproof sheet having a multilayer construction for controlling bacterial growth, eliminating odor and resisting wear, comprising:
- a polyurethane film having an upper and lower side forming an innermost layer;
- a layer of polyurethane adhesive disposed on each upper and lower side of the film; and
- a layer of knitted material disposed on each layer of adhesive forming opposed outer layers of the sheet, the knitted material being woven from a first yarn and a second yarn, the first yarn being a nylon filament containing ultra-micro silver ions and the second yarn being a polyester yarn.
7. The sheet of claim 6, wherein the material is made of approximately 20 to 40% of the first yarn and 60-80% of the second yarn.
8. The sheet of claim 7, wherein the material has a gauge of 28 to 32 weaves of fiber.
9. The sheet of claim 6, wherein the polyurethane film has a thickness of about 0.05 to 0.15 mm.
10. The sheet of claim 6, wherein the silver powder ions are 1 micron or less.
Type: Application
Filed: Mar 31, 2004
Publication Date: Jun 23, 2005
Inventors: Yoshimichi Taniguchi (Kasugai Prefecture), Yoshiari Kawada (Nakamuraku), Hiromi Ichiba (Esmond, RI)
Application Number: 10/813,675