# US 4,395,943 A · Interproximal toothbrush

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- Number: US 4,395,943 A
- Document ID: US4395943A
- Status: Granted
- Kind: A
- Application number: 06/304,034
- Filed: 1981-09-21
- Granted: 1983-08-02
- Earliest claimed: 1980-10-22
- Assignees: Esro AG
- Inventors: Paul Brandli
- Web page: https://patentgrep.com/patent/US4395943A

## CPC

- A46B 3/18: the bristles being fixed on or between belts or wires
- A46B 2200/1066: Toothbrush for cleaning the teeth or dentures (A61C17/16 takes precedence; bristles arrangements for toothbrushes A46B9/04)
- A46B: BRUSHES (handles not integral with brushware B25G)

## Abstract

A brush construction is disclosed which comprises one or more twisted wires having fixed filaments between turns of the wire or wires, the wire or wires having an electrically insulated, wear-resistant and elastic layer thereon. This prevents the wire from reacting with its surroundings, for example, producing a galvanic or electrical effect when used as a dental or oral cleansing brush.

## Claims

### Claim 1

An interproximal toothbrush for cleaning the interdental spaces between teeth comprising, one twisted double wire having an outer end portion for insertion into an interdental space with a plurality of fixed filaments positioned between turns of said one twisted double wire said filaments extending radially from said outer end portion in all directions, said twisted double wire having a covering layer of wear-resistant electrically insulating and soft elastic material formed of a continuous, coherent lacquered layer of plastic, said twisted double wire comprising two wire strands each with a diameter of about 0.3 mm, said plastic being cross-linked polyurethane, each of said wire strands being entirely enclosed by said layer of plastic material.

### Claim 2 (depends on 1)

A brush according to claim 1, wherein said fixed filaments increase in length from an end of said outer end portion of said one twisted double wire to form a tapered interdental brush.