INTERVENTIONAL MEDICAL DEVICE RETRIEVAL

• US 20170340316A1
• Filed: 05/25/2016
• Published: 11/30/2017
• Est. Priority Date: 05/25/2016
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Wood, Rnn, Golenberg, Lavie, McDonnell, Paula
• Granted Patent: US 10,542,964 B2
• Time in Patent Office: Days
• CPC Class Codes: A61B 17/00234 for minimally invasive surgery A61B17/0218, A61B17/0469, A61B17/12013, A61B17/1285, A61B17/29, A61B17/320016 take precedence
• CPC Class Codes: A61B 17/50 Instruments, other than pincettes or toothpicks, for removing foreign bodies from the human body locating otherwise A61B5/06; locating by radiation A61B6/00; removing calculi A61B17/22; from the eyes A61F9/00709
• CPC Class Codes: A61B 2017/00336 with a protective sleeve, e.g. retractable or slidable
• CPC Class Codes: A61B 2017/00358 Snares for grasping
• CPC Class Codes: A61B 2017/00862 elastic or resilient for sutures A61B2017/0618
• CPC Class Codes: A61B 2017/00951 adhesive
• CPC Class Codes: A61N 1/362 Heart stimulators heart defibrillators A61N1/39
• CPC Class Codes: A61N 1/37205 Microstimulators, e.g. implantable through a cannula
• CPC Class Codes: A61N 1/3756 Casings with electrodes thereon, e.g. leadless stimulators

Abstract

A system for retrieving an implanted medical device includes an outer tubular member and a contractible super-elastic net, which may be joined to an elongate shaft that extends in sliding engagement within the outer tubular member. When the net expands from a contracted condition the net defines a longitudinally extending tubular cavity. An open end of the cavity is sized to receive passage of a housing of the device therethrough; and the net, with the device housing contained therein, forms an interference fit within an inner diameter of the outer tubular member. But, an outer diameter of the net, in a fully expanded condition, is larger than the inner diameter.

Claims

1. A system for retrieving an implanted medical device, the device comprising an electronic controller, a hermetically sealed housing containing the controller and extending over a length from a proximal end thereof to a distal end thereof, and a fixation member mounted to the housing distal end for fixing the device to tissue at the implant site, and the system comprising an elongate outer tubular member including a longitudinally extending lumen, the lumen terminating in a distal-most opening that allows passage of the medical device therethrough, and an inner diameter of the lumen in proximity to the distal-most opening being sized to contain the medical device therein;

and wherein the system further comprises a retrieval assembly, the assembly comprising;

a contractible super-elastic net, the net defining a longitudinally extending tubular cavity when the net expands from a contracted condition thereof, the cavity extending between a closed end thereof and an open end thereof, the open end of the cavity being sized to receive passage of the device housing therethrough, and the net, when in a fully expanded condition, having an outer diameter larger than the inner diameter of the system outer tubular member in proximity to the distal-most opening;

an elongate shaft joined to the net in proximity to the closed end thereof; and

an elongate retention tube including a lumen, in which the shaft extends in sliding engagement, the retention tube extending within the lumen of the outer tubular member of the system and including a distal opening; and

wherein, the retention tube lumen is sized to hold the net in the contracted condition therein, when the shaft pulls the net into the lumen through the distal opening thereof; and

the net, with the device housing contained therein, forms an interference fit within the inner diameter of the system outer tubular member.

2. The system of claim 1, wherein the retrieval assembly further comprises a relatively tacky material lining at least an interior surface of the super-elastic net.

3. The system of claim 1, wherein the retrieval assembly super-elastic net comprises a plurality of super-elastic wires spaced apart from one another around the net cavity, each wire extending along a sinusoidal path.

4. The system of claim 3, wherein each wire of the plurality of super-elastic wires comprises a coating of a relatively tacky material.

5. The system of claim 1, wherein the retrieval assembly super-elastic net comprises a laser cut super-elastic tube.

6. The system of claim 1, wherein the outer diameter of the retrieval assembly super-elastic net tapers outward at the open end of the cavity.

7. A system for retrieving an implanted medical device, the device comprising an electronic controller, a hermetically sealed housing containing the controller and extending over a length from a proximal end thereof to a distal end thereof, and a fixation member mounted to the housing distal end for fixing the device to tissue at the implant site, and the system comprising an elongate outer tubular member including a longitudinally extending lumen, the lumen terminating in a distal-most opening that allows passage of the medical device therethrough, and an inner diameter of the lumen in proximity to the distal-most opening being sized to contain the medical device therein;

and wherein the system further comprises a retrieval assembly, the assembly comprising;

a contractible super-elastic net, the net defining a longitudinally extending tubular cavity when the net expands from a contracted condition thereof, the cavity extending between a closed end thereof and an open end thereof, the open end of the cavity being sized to receive passage of the device housing therethrough, and the net, when in a fully expanded condition, having an outer diameter larger than the inner diameter of the system outer tubular member in proximity to the distal-most opening;

a relatively tacky material lining at least an interior surface of the super-elastic net; and

an elongate shaft joined to the net in proximity to the closed end thereof, the shaft extending in sliding engagement within the lumen of the outer tubular member of the system; and

wherein the net, with the device housing contained therein, forms an interference fit within the inner diameter of the system outer tubular member.

8. The system of claim 7, wherein the retrieval assembly super-elastic net comprises a plurality of super-elastic wires spaced apart from one another around the net cavity, each wire extending along a sinusoidal path.

9. The system of claim 8, wherein the relatively tacky material of the retrieval assembly comprises a coating around each wire of the plurality of super-elastic wires.

10. The system of claim 7, wherein the retrieval assembly super-elastic net comprises a laser cut super-elastic tube.

11. The system of claim 7, wherein the outer diameter of the retrieval assembly super-elastic net tapers outward at the open end of the cavity.

12. A method for retrieving an implantable medical device from an implant site, the device comprising an electronic controller, a hermetically sealed housing containing the controller and extending over a length from a proximal end thereof to a distal end thereof, and a fixation member mounted to the housing distal end for fixing the device to tissue at the implant site, and the method comprising:

advancing a system to the implant site so that a distal-most opening of an outer tubular member of the system is located in proximity to the medical device;

advancing a super-elastic net out from the distal-most opening of the outer tubular member, so that the net expands and surrounds the housing of the device, the expanded net defining a longitudinally extending tubular cavity; and

applying a pull force to the expanded net while advancing the outer tubular member over the expanded net, thereby contracting the net around the housing of the device and drawing the device into the outer tubular member, through the distal-most opening thereof.