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USA-Patentanmeldung 289265449 US vom 1997

"Flat composite fabric with memory-metal
and its applications"

Registered:
in Germany DE 195 29 500 C2,
in Europe EP 961 12 965.7 and
in the USA US 732,927-08

Priority 10.08.1995

Inventors and patent holders:
Dr. V. Prieb (Berlin, DE); H. Steckmann, (Graevenwiesbach, DE)

Abstract:

Object of the invention:
A flat composite fabric comprising a flat fabric and wires which are permanently incorporated therein and which are made of an alloy possessing shape memory properties (memory fabric) and its application in the medicine, aeronautic and space technology. A one of this application - massage device - is especially suitable for the fitness aims at home.


Manufacturing of the flat composite fabric:
Memory-metal wires are incorporated between two flat layers of a conventional elastic fabric in a sandwich configuration. This can be done by means of ultrasonic welding, for example. The memory wires are bent in a meandering configuration by means of a bending tool. These meanders are trained than to the two-way memory effect. The composite memory fabric can be manufactured in the form of a continuous dressing, bandage or sleeve. The transformation temperatures and the hysteresis width are variable depend on the alloy concentration such that the human body temperature lay under, within or above the hysteresis loop. The ends of meandering wires are electrical contacts and connected with an electrical current source.

Properties of the memory fabric:
The memory fabric is very soft at the room temperature and can be easy tensed. At the heating through the human body or by means of a current impulse the memory fabric contracts and press on the body. The compression force and compression deformation of the memory fabric can be optimize (between 50% and 250% inelastic deformation) depend on the meander shape parameters.


Applications:
  1. Passive compression bandages and support dressing:
    At this application the transformation temperature Ms is lower as the temperature on the human body surface (Ms<Tb~30?C). If the Af < Tb too, the bandage is heated through the body heat. If Ms<Tb, the bandage can be heated by means a one current impulse. In the both case the bandage made of the memory fabric contracts, remains in this state and exerts the compression on the body.

  2. Active massage devices as a gradient systems and pressure suits for pilots and astronauts:
    These devices (cuffs, sleeve, pressure suits made of the memory fabric with As>Tb) are provided for electrical contacts, power source and electronic control device for generating current impulses such that the contraction of the memory fabric takes place as a result of heating by means of time-controlled current impulses. The relaxation of memory fabric takes place at the cooling up to the body temperature during the current breaking. In this way continuously repeating pressure waves can be produced.

More:
Patent full script, english
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