Interventional medical systems, tools, and associated methods

摘要

A tool of an interventional medical systems system includes a core configured to be temporarily attached to the implantable medical device, as the tool deploys the device to expose a fixation member of the device for engagement with tissue at a target implant site; the core is then employed to verify adequate fixation of the deployed device via a tug test. An operator determines that the device is adequately fixed by the engaged fixation member, if a tug force that is applied to the core modifies the temporary attachment between the core and the device, to allow release of the device from the temporary attachment. A tether, which is fixedly attached to the core, may be employed to create the temporary attachment between the core and the device, or the temporary attachment may be created by a snap fit formed between the core and the attachment structure of the device.

主权项

1. An interventional medical system comprising an implantable device and a delivery tool facilitating deployment of the implantable device, the device including an attachment structure and a fixation member, the fixation member being configured to engage tissue at an implant site and thereby fix the device at the implant site; and the tool comprising an outer tube and a core, the outer tube comprising a distal-most portion sized to receive the device therein, the core extending within the outer tube, and the core comprising:
a distal member located within the distal-most portion of the outer tube, the distal member being configured to form a snap fit with the attachment structure of the device, the snap fit temporarily attaching the device to the tool; and wherein the snap fit of the distal member disengages to release the attached device, only when a tug force, applied to the core of the tool, is greater than or equal to a predetermined force, the predetermined force corresponding to a minimum adequate fixation force of the engaged fixation member fixing the device at the implant site.