Wire-stranded hollow coil body, a medical equipment made therefrom and a method of making the same
AssigneeAsahi Intecc Co., Ltd.
InventorsTomihisa Kato, Kenji Miyata
Life of this patent
Estimating the term…
Abstract
A wire-stranded hollow coil body (1) has a multitude of coil line elements (2) stranded along a predetermined circular line to form a flexible wire tube having a central axial hollow portion (3), the flexible wire tube is stranded under a strand-turn resistant load and heat treated to remove a residual stress upon formation so as to provide a high rotation-following capability and a high straightness. Further, a method provides a way to strand the coil line elements (2) under a strand-turn resistant load while heat treating the coil line elements (2).
Claims14
A wire-stranded hollow coil body comprising a multitude of coil line elements stranded along a predetermined circular line to form a flexible linear tube having a central axial hollow portion, whereby said flexible linear tube is stranded under a strand-turn resistant load and heat treated to remove a residual stress upon formation so as to provide a high rotation-following capability and a high straightness.
A method of making a wire-stranded hollow coil body comprising a multitude of coil line elements stranded along a predetermined circular line to form a flexible linear tube having a central axial hollow portion,
- the method comprising steps of;
- clamping one end of a primary forming flexible linear tube by means of a rotationally active chuck, and arranging the other end of said primary forming flexible linear tube to be slidable in its lengthwise direction, and clamping said other end by a fixture chuck to impart a tensile force with said primary forming flexible linear tube;
- actuating said rotationally active chuck to strand said primary forming flexible linear tube, and concurrently or thereafter heat treating said primary forming flexible linear tube to remove a residual stress upon forming said coil line elements by electrically conducting between said rotationally active chuck and said fixture chuck.
A method of making a wire-stranded hollow coil body comprising a multitude of coil line elements stranded along a predetermined circular line to form a flexible linear tube having a central axial hollow portion,
- the method comprising steps of;
- clamping one end of a primary forming flexible linear tube by means of a rotationally active chuck, and clamping halfway middle portions of said primary forming flexible linear tube by means of middle clamp portions, and stranding said primary forming flexible linear tube in different strand turns depending on spans between said rotationally active chuck and each of said middle clamp portions.
A method of making a wire-stranded hollow coil body comprising a multitude of coil line elements stranded along a predetermined circular line to form a flexible linear tube having a central axial hollow portion,
- the method comprising steps of;
- concurrently or after stranding a primary forming flexible linear tube, accommodating lengthwisely divided sections of a primary forming flexible linear tube into heating devices, each of which has different heating condition depending on said lengthwisely divided sections, so as to heat treat said pluralistically divided sections individually to have residual stresses removed in different degrees.
Dependencies are inferred from the claim text.