Technimark, Inc.

Hermann J Frings

Franz Josef Hallmann

Albert Keusch

An axially-compressible coil carrier comprising first and second parallel, coaxial end rings, a plurality of carrier rings positioned between the first and second end rings, and a plurality of support struts arranged in rings, the rings of struts alternating with the carrier rings, and neighboring carrier rings being joined to each other by one of the rings of support struts. The carrier rings are parallel to and coaxial with each other and with the first and second end rings, and are separated by an inside distance of between about 5 mm and about 12 mm. The struts in each of the rings are divided into first and second groups. The struts in the first group are spaced equidistantly around the circumference, and are alternated with pairs of struts of the second group. The struts of the second group are generally parallel to their neighboring struts of the first group to form triads of parallel struts, the struts in each the triad being equidistantly spaced. The junctions of the outer surfaces and the side faces of the struts of the first group are uniformly inclined at an angle .alpha. of between about 11.degree. to about 30.degree. to a line on the outer cylindrical surface parallel to the longitudinal axis of the coil carrier. The side faces of the struts of the first group are uniformly inclined at an angle .beta. of between about 1.degree. and about 10.degree. to respective radii of the coil carrier. The struts on opposite sides of a carrier ring have opposite inclinations. Preferably, each of the struts has in the outer cylindrical surface a width between the side faces of between about 0.7 mm and about 3.0 mm; and each of the struts has an average extent between the inner and outer faces of about 4 mm to about 8 mm; and the number of struts in each the ring of struts is between 12 and 24.

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Alsdorf, Germany

Hermann J Frings