Abstract: There is disclosed a system for recovering motor function after spinal cord injury, which has a mat having a first sheet made from a semi-conductive or insulating material and with a volume resistivity of less than 104 &OHgr;·cm and a second sheet made from a semi-conductive or insulating material, laminated on the first sheet and with a volume resistivity of 104 &OHgr;·cm or more; an electric power source; an electrical circuit to apply 25-800 VDC to the first sheet; and a control unit for the system. A person with spinal cord injury is made contact with the mat, so as to put his body in electrostatic field to be induced on the mat.

Abstract: By a sheath tube manufacturing apparatus comprising a wrapping section (20a) having a core (21a) for wrapping a single ribbon-like member (10a) having a predetermined width thereon, a member supply section (40a) for supplying the ribbon-like member at a predetermined angle, so that the ribbon-like member is wrapped spirally, with the end thereof overlapped, a rotation section (30a) for rotating the wrapping section (20a), a welding section (50a) for fusing and pressing the overlapped portion of the ribbon-like member wrapped around the wrapping section, and a member delivery section (60a) for pressing the fused overlapped portion and delivering it from the core, the single ribbon-like member having a predetermined width is wrapped spirally, with the end thereof overlapped, and this overlapped portion is welded to be formed in a cylindrical shape.

Abstract: A system for preventing and curing osteoporosis and obesity, which has a mat essentially consisting of a first sheet made from a semiconductive or insulating material and having a volume resistivity of less than 10.sup.4 .OMEGA..cm and a second sheet made from a semiconductive or insulating material, laminated on the first sheet and having a volume resistivity of 10.sup.4 .OMEGA..cm or more; an electric power source; an electrical circuit to apply DC voltage of 25-800 to the first sheet; and a control unit. A normal person or patient is made contact with the mat, so as to put his body in electrostatic field to be formed on the mat. In another embodiment, a third sheet of a material having a volume resistivity of more than 10.sup.12 .OMEGA..cm is used such that the first sheet is sandwiched between the third and second sheets.