DE10305142A1 - Surface treatment for door handles or telephones and the like, to kill or neutralize germs, uses silver or a silver alloy in nano particle dimensions together with a plastics or paint as the carrier - Google Patents

Abstract

To treat surfaces so that they kill or neutralize germs, metal particles of nano dimensions are suspended in a plastics (8) or a paint or a powder coating (7) to cover the surfaces. In a nano porous state the metal particles are used at a rate of 0.1-2.0 wt.% of the carrier and, in a nano dispersion, they are used as 0.01-0.1 wt.%. The treated surface can be a door handle as a metal tube (2) with a plastics grip dosed with metal (4), pushed over it with a nipple (3) to lock into a drilling (1). For removal, the nipple is drilled out over the recess (3b) by a hand drill. The door handle is labeled (6) as germ-free.

Description

According to the Robert Koch Institute in Berlin, more people die from infections acquired in hospitals than on the road.

This specific infection problem has been scary in recent years dimensions adopted because extremely dangerous Germs have developed resistance that is hardly or not at all fought with antibiotics can be.

In clinics and comparable facilities huge efforts made through hygienic measures to deal with this problem. One of the critical points in a chain of infection opportunities is the doorknob. Transfer here Patients, doctors, Nursing staff and visitors inevitably get their germs. comparable There are problems in retirement homes, hotels, medical practices, and public ones Toilets etc .; ultimately everywhere where strangers come together. But also in private areas the risk of becoming infected with resistant germs increases.

There are analogies in the problem also with telephone receivers, Toilet seats and utensils from the sanitary and medical sector clearly to determine. The main problem with these switching points is the fact that an inevitable contact with these preliminary or Facilities takes place when they are to be used.

The object of the invention is this Context in the surfaces to provide said switching points with germicidal properties, about germ transmission effectively interrupt at this point.

It is known that surfaces of Door handles, Telephone equipment, utensils from the sanitary and medical sector etc. are provided with substances whose properties are intended to kill germs. However, these substances have the disadvantage that they are either more or less toxic, the germicidal activity is too low or the required properties are not kept long enough can be.

To the disadvantages mentioned above To reduce considerably, nano-sized metal particles in particular are intended for this Silver particles are used.

Experience with nano-silver doped plastics show sufficient effectiveness with more than 600 different Germinate. The germs that cause major problems in the clinic, such as the methicillin resistant staphylococci MRSE and MRSA successfully killed.

With correct dosage, in even achieved a permanent effect in some areas of application because that Nano-silver represents a sufficient Ag ion depot in the polymer.

The anti-infective properties Several mechanisms of action are attributed to nanosilver: First, the silver ions that form block the metabolism the germs. Second, Ag ions put a stop code on the DNA of the Microbe and thus prevent their reproduction. The third effect is the fact that there is no on the effective surface Can form biofilm with a permanent source of germs.

The regulation of the ion release takes place via a complex control loop, resulting in a long-term germicidal effect becomes.

To have a satisfactory germicidal effect achieve is the correct dosage for the particular one used To determine plastic and the purpose, using the used dye and possibly other substances to be added for their tolerance to be taken into account with the Ag ions are.

The doorknob, telephone receiver etc. according to the invention provides a germicidal surface at least in the grip area (contact surface). The metal particles provided for this can, if the objects are made of plastic, be mixed directly with the material. Drawing 1 pos. ( 8th ).

To the material costs of the metal particles can reduce but also product cores e.g. by co - extrusion with doped Plastic coated.

Furthermore, coatings by paints or powder coatings ( 7 ) conceivable.

Another conceivable technology products or To provide parts of them with anti-infective substances brushing in of the metallic particles in the roughened surface. This Method is even possible with more or less any materials.

Assuming that the germicidal properties of the doped surfaces can have a long but not unlimited lifespan it may be useful to have the contact area of the facility interchangeable to design.

Representing this is in the drawing 1 as an embodiment a door handle shown.

The main body of the lever handle is a metal tube ( 2 ) on which the metal-doped plastic handle ( 4 ) is postponed. In the front area, the handle has a nipple ( 3 ) which, in the deferred set position, into the hole ( 1 ) no longer reversibly engages in the carrier tube. To ensure that the handle can be pushed open due to the nipple, the slot provided ( 5 ) spread.

This device prevents easy removal of the handle - an important criterion, especially in public facilities -. After Ab over the life of the germicidal properties of the surface, the nipple ( 3 ) about the deepening ( 3b ), drilled out using a hand drill.

It makes sense to point out the sterility of the door handle by direct reference ( 6 ).

Claims (13)

Surfaces with a germicidal effect are characterized in that metals whose properties can kill germs or render them ineffective are placed in surfaces of infection interfaces such as door handles and telephone receivers in order to interrupt the transmission of infection at this point. surfaces according to claim 1, characterized in that the metals from particles in colloidal form, in particular consist of relatively uniform nano-size. surfaces according to claim 2, characterized in that the metal used preferably made of silver or its alloys or one other suitable metal or a mixture of different Metals. surfaces according to claim 3, characterized in that the metallic particles used in a plastic, preferably introduced into its surface become. surfaces according to claim 3, characterized in that the particles as a coating in the form a paint as an active ingredient carrier to the surface be applied. surfaces according to the claims 3 or 4 characterized in that the metallic particles into the surface of any material can be brushed in surfaces according to one or more of claims 1 to 4, characterized in that the metallic particles with the help of another suitable Procedure to the surface be applied. surfaces according to one or more of claims 1 to 7, that the active ingredient silver is in a nano-porous state in a concentration from e.g. 0.1 - 2 % Ag in the active ingredient carrier is introduced. surfaces according to one or more of claims 1 to 7, that the active ingredient silver is in a nanodispersed state in a concentration from e.g. 0.01-0.1 % Ag in the active ingredient carrier is introduced. surfaces according to one or both of the claims 8 and 9 characterized in that the active ingredient mixed silver both in the nanopore and in the nanodisperse state in suitable conditions in the drug carrier be introduced. surfaces characterized in that the active ingredient metal or another suitable biocide on the active substance carrier as a matrix is chemically bound. surfaces according to the previous claims 1 to 11 characterized in that the relevant products for sterility by a direct written notice or a corresponding symbol is pointed out. surfaces Claim 12 characterized in that in the case of a lever handle a suitable device that prevents easy removal of the handle becomes.