Small diameter cable
AssigneeFort Wayne Metals Research Products Corporation
InventorsRobert A. Mitchell, Mark S. Michael
Life of this patent
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Abstract
A wire cable construct including a plurality of strands each made of a plurality of wire filaments, the strands and wire filaments arranged in a 37×7 configuration of 37 strands of 7 wire filaments each, with the strands arranged in four layers including a first, central layer of a single strand, a second layer of six strands, a third layer of twelve strands and a fourth, outermost layer of eighteen strands. The cable may have a small diameter for use in medical device applications, and the strand and wire element configuration allows the cable to carry high axial loads, minimizes bending stress when the cable is routed around a tight turn such as a small pulley, and minimizes torsion in the cable due to axial loading.
Claims37
A wire cable comprising:
- 37 strands, each strand including at least 7 wire filaments, each of the wire filaments formed from a medical-grade material, the strands arranged in layers comprising:
- a first, central layer of a single strand;
- a second layer of six strands;
- a third layer of twelve strands;
- and
- a fourth, outermost layer of eighteen strands,
- the wire filaments each having a diameter between 0.005 mm and 0.143 mm, and the wire cable having an outermost diameter between 0.11 mm and 3.0 mm;
- and
- wherein a lay factor of each of the first through fourth layers is between 5 and 17.
A wire cable comprising:
- 37 strands, each strand including at least 7 wire filaments, each of the wire filaments formed from a medical-grade material, the strands arranged in layers comprising:
- a first, central layer of a single strand;
- a second layer of six strands;
- a third layer of twelve strands;
- and
- a fourth, outermost layer of eighteen strands,
- the wire filaments each having a diameter between 0.005 mm and 0.143 mm, and the wire cable having an outermost diameter between 0.11 mm and 3.0 mm;
- and
- wherein at least the third and fourth layers are wound in mutually opposite helical directions.
A medical device, comprising:
- at least one pulley having a root diameter;
- and
- a wire cable comprising:
- 37 strands, each strand including at least 7 wire filaments, the strands arranged in layers comprising:
- a first, central layer of a single strand;
- a second layer of six strands;
- a third layer of twelve strands;
- and
- a fourth, outermost layer of eighteen strands,
- the wire cable having an outermost diameter between 0.11 mm and 3 mm, and the root diameter being between 3 and 6 times the outermost diameter of the wire cable;
- and
- wherein a lay factor of each of the first through fourth layers is between 5 and 17.
A medical device, comprising:
- at least one pulley having a root diameter;
- and
- a wire cable comprising:
- 37 strands, each strand including at least 7 wire filaments, the strands arranged in layers comprising:
- a first, central layer of a single strand;
- a second layer of six strands;
- a third layer of twelve strands;
- and
- a fourth, outermost layer of eighteen strands,
- the wire cable having an outermost diameter between 0.11 mm and 3 mm, and the root diameter being between 3 and 6 times the outermost diameter of the wire cable;
- and
- wherein at least the third and fourth layers are wound in mutually opposite helical directions.
Dependencies are inferred from the claim text.