| 摘要 |
A retractable screw-type stimulation or defibrillation intracardiac lead is disclosed. According to one embodiment, the lead comprises a flexible hollow sheath (12) having at its distal end a lead head (10) and a connector (66) at its proximal end. The connector comprises a pin (62) connected to a lead head electrode (18). The lead head comprises a tubular body (28), at least one electrode (18, 20) for stimulation or defibrillation, a moving element translationally and rotationally moving within the tubular body in a helical motion, an anchoring screw (24) axially moving with respect to the tubular body, and a deployment mechanism (22) to deploy the anchoring screw out of the tubular body (28). The lead is a co-radial type, and the moving element (26) secured to the anchoring screw is connected to the tubular body (28) by a helical guide (46) and a coupling finger (56) protruding between two successive turns of the helical guide (46) for transforming a rotary movement imparted to the lead body in a deployment or retraction movement of the moving element (26). The helical guide (46) is resiliently compressible, with a free end (52) with a flat area (54) facing a flange (38) in vis-à-vis, so as to pinch the coupling finger (56) and to perform the function of a clutch limiting the torque transmitted to the anchoring screw by the rotation of the lead body, even in case of continuation of this rotation. |
| 主权项 |
1. A lead, comprising:
at least one conductor; a sheath surrounding the at least one conductor and configured to rotate under a rotary force applied to a proximal end of the lead; a body coupled to a distal end of the sheath; a moving element contained within the body configured to move translationally along the body when the body is rotated by the rotary force; wherein the moving element comprises a flange extending radially from an axis of the moving element and a helical guide carried by the moving element; an anchoring screw having a proximal end and a distal end, wherein the proximal end of the anchoring screw is coupled to the moving element, and wherein the flange of the moving element acts on the anchoring screw to push the anchoring screw out a distal end of the body; a coupling finger, extending radially inward from the body and configured to interact with the helical guide to translationally move the moving element and push the anchoring screw out the distal end of the body; wherein an end portion of the helical guide is configured to engage with the coupling finger such that the helical guide and the body become engaged; and wherein when the helical guide and the body become engaged, the rotary force acting on the body is provided through the helical guide and the moving element to the anchoring screw, to impart rotary motion on the anchoring screw. |
