| 摘要 |
Delivery tools of interventional medical systems facilitate deployment of relatively compact implantable medical devices that include sensing extensions, for example, right ventricular cardiac pacing devices that include a sensing extension for atrial sensing. An entirety of such a device is contained within a delivery tool while a distal-most portion of the tool is navigated to a target implant site; the tool is configured to expose, out from a distal opening thereof, a distal portion of the device for initial deployment, after which sensing, via a sense electrode of the aforementioned sensing extension of the device, can be evaluated without withdrawing the tool from over the remainder of the device that includes the sensing extension. |
| 主权项 |
1. A delivery tool facilitating deployment of an implantable medical device, the device including an electronic controller, an hermetically sealed housing containing the controller, and a sensing extension coupled to the controller, the extension extending externally from a proximal end of the housing, the extension including a sense electrode, and the tool comprising:
a handle including a control member; an elongate inner member including a proximal end secured to the handle, a distal end, an inner conductive feature located in proximity to the distal end of the inner member, and a lumen extending proximally from an opening thereof that terminates the distal end of the inner member, the distal end of the inner member being configured to abut the proximal end of the device housing, and the lumen being sized to accommodate the extension of the device, when the distal end of the inner member abuts the proximal end of the device, such that the sense electrode interfaces with the inner conductive feature; and an elongate deployment tube including a proximal end coupled to the control member of the handle, a distal-most portion, a lumen extending from an opening thereof at the proximal end of the deployment tube to another opening thereof that terminates the distal-most portion at a distal end thereof, and an outer conductive feature located along, or in proximity to the distal-most portion, the inner member extending within the lumen of the deployment tube, an entirety of the deployment tube being longitudinally moveable with respect to the inner member by means of the control member of the handle, and the lumen of the deployment tube, along a length of the distal-most portion, being sized to contain the distal end of the inner member together with an entirety of the device housing; and wherein the inner conductive feature of the inner member is configured to provide a conductive pathway between the interfacing sense electrode of the sensing extension of the device and the outer conductive feature of the deployment tube, and the outer conductive feature of the deployment tube is configured to provide a conductive pathway between the inner conductive feature and a location outside the deployment tube, when the inner and outer conductive features are approximately aligned with one another via movement of the deployment tube with respect to the inner member. |
