Interventional medical systems, tools, and methods of use

Patent metadata

Field	Value
Publication number	US-2016015983-A1
Application number	US-201414518128-A
Country	US
Kind code	A1
Filing date	Oct 20, 2014
Priority date	Jul 17, 2014
Publication date	Jan 21, 2016
Grant date	—

Abstract

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.

First claim

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.

2 . The tool of claim 1 , wherein each of the inner and outer conductive features comprises one or more apertures providing conduction via fluid communication between the location outside the deployment tube and the sense electrode of the device extension, when the lumen of the inner member accommodates the extension and the distal end of the inner member abuts the proximal end of the device housing, and when the inner and outer conductive features are approximately aligned.

3 . The tool of claim 1 , wherein:
the inner conductive feature comprises an electrically conductive segment of the inner member, the segment of the inner member being in electrical contact with the sense electrode of the device extension, when the lumen of the inner member accommodates the extension and the distal end of the inner member abuts the proximal end of the device housing; and the outer conductive feature comprises an electrically conductive segment of the deployment tube, the segment of the deployment tube being in electrical contact with the segment of the inner member, when the inner and outer conductive features are approximately aligned.

4 . The tool of claim 3 , wherein the conductive segment of the inner member comprises a conductive material within a wall of the inner member; and the conductive segment of the deployment tube comprises a conductive material within a wall of the deployment tube.

5 . The tool of claim 3 , wherein the conductive segment of the inner member comprises a conductive insert joined to a wall of the inner member; and the conductive segment of the deployment tube comprises a conductive insert joined to the wall of the deployment tube.

6 . The tool of claim 1 , further comprising a snare member including an elongate shaft extending within the lumen of the inner member, and a loop coupled to a distal end of the shaft, the distal end of the shaft being located in proximity to the distal end of the inner member.

7 . An interventional medical system comprising:
an implantable medical device comprising 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; a delivery tool facilitating deployment of the device, 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.

8 . The system of claim 7 , wherein each of the inner and outer conductive features of the tool comprises one or more apertures providing conduction via fluid communication between the location outside the deployment tube and the sense electrode of the device extension, when the lumen of the inner member of the tool accommodates the extension and the distal end of the inner member abuts the proximal end of the device housing, and when the inner and outer conductive features are approximately aligned.

9 . The system of claim 7 , wherein:
the inner conductive feature of the tool comprises an electrically conductive segment of the inner member of the tool, the conductive segment of the inner member being in electrical contact with the sense electrode of the device extension, when the lumen of the inner member accommodates the extension and the distal end of the inner member abuts the proximal end of the device housing; and the outer conductive feature of the tool comprises an electrically co

Assignees

• Medtronic Inc

Inventors

• Sheldon Todd J
• Bonner Matthew D
• Hilpisch Kathryn
• Neafus Noelle C
• Wood Ronan

Classifications

• A61N1/37205

  Microstimulators, e.g. implantable through a cannula · CPC title

• A61B2017/00358

  Snares for grasping · CPC title

• A61B2090/0811

  for the position of a particular part of an instrument with respect to the rest of the instrument, e.g. position of the anvil of a stapling instrument · CPC title

• A61N2001/0585

  Coronary sinus electrodes · CPC title

• A61N1/0573

  chacterised by means penetrating the heart tissue, e.g. helix needle or hook · CPC title