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1. (WO2017173166) EXTRACTION DEVICES CONFIGUED TO EXTRACT CHRONICALLY IMPLANTED MEDICAL DEVICES
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What is claimed is:

1. An extraction device for removing a previously implanted leadless cardiac pacemaker (LCP), the LCP including a retrieval feature disposed at a proximal end of the LCP, the extraction device having a proximal region and a distal region, the extraction device comprising:

a retrieval ca vity at the distal region of the extraction device that is sized to accommodate at least part of the LCP therein once the LCP is extracted;

a retrieval loop extendable beyond the retrieval cavity and manipulatable from the proximal region by an operator of the extraction device;

the retrieval loop is configured along an inside surface of the retrieval loop to cut through ingrowth tissue that extends over the LCP in order to expose the retrieval feature of the leadless cardiac pacemaker; and

the retrieval loop is further configured to grasp the exposed retrieval feature and pull the LCP into the retrieval cavity of the extraction device.

2. The extraction device of claim 1 , wherein the retrieval loop forms at least part of a loop with a first surface on an inner side of the loop and a second surface on an outer side of the loop, wherein the first surface is configured to cut tissue better than the second surface.

3. The extraction device of claim 2, wherein:

the first surface comprises an abrasive material and the second surface does not include the abrasive material: or

the first surface comprises a cutting edge and the second surface is smooth, the cutting edge optionally including a plurality of teeth.

4. The extraction device of any one of claims 1 to 3, wherein at least a portion of the inside surface of the retrieval loop is electrically exposed to conduct RF energy to cut through the ingrowth tissue.

5. The extraction device of any one of claims 1 to 4, further comprising an extendable funnel that is configured to be extended relative to the retrieval cavity.

6. The extraction device of claim 5, wherein the extendable funnel is configured to be rotatable and includes a cutting surface on an interior of the extendable funnel in order to cut through ingrowth tissue covering the retrieval feature of the LCP.

7. An extraction device for removing a previously implanted LCP, the implanted LCP including a retrieval feature disposed at a proximal end of the LCP, the extraction device having a proximal region and a distal region, the extraction device comprising:

a retrieval cavity at the distal region of the extraction device that is sized to accommodate at least part of the LCP therein once the LCP is extracted; and

an extractor member extendable beyond the retrieval cavity and configured to cut through ingrowth tissue that extends over the LCP in order to expose the retrieval feature of the LCP.

8. The extraction device of claim 7, wherein the extractor member comprises a hollow needle that is fluidly coupled with a fluid source in order to inject a fluid in a space between the implanted LCP and the ingrowth tissue; and optionally further comprises a preshaped cutting stylet that is extendable through the hollow needle in order to cut through the ingrowth tissue.

9. The extraction device of claim 7, wherein the extractor member comprises a deflectable probe that is configured to pierce and cut through the ingrowth tissue.

10. The extraction device of claim 7, wherein the extractor member comprises a grasping forceps configured to grasp and tear at the ingrowth tissue.

11. The extraction device of any one of claims 7 to 10, further comprising a retrieval loop that is extendable beyond the retrieval cavity and manipulatable from the proximal region by an operator of the extraction device, wherein the retrieval loop is manipulatable to grasp the retrieval feature of the implanted LCP and pull the implanted LCP into the retrieval cavity.

12. A retrieval loop for removing a previously implanted LCP, the retrieval loop comprising a first surface and an opposing second surface, wherein the first surface is configured to cut tissue better than the opposing second surface.

13. The retrieval loop of claim 12, wherein the retrieval loop forms at least part of a loop with the first surface on an inner side of the loop and the second surface on an outer side of the loop, wherein the first surface includes one or more cutting features and the second surface is free from cutting features.

14. The retrieval loop of claim 13, wherein;

the first surface comprises an abrasive material and the second surface does not include the abrasive material; or

the first surface comprises a cutting edge and the second surface is free from a cutting edge.

15. The retrieval loop of any one of claims 12 to 14, wherein at least a portion of the first surface is electrically exposed to conduct applied RF energy to the ingrowth tissue to cut through the ingrowth tissue, and the second surface is not electrical exposed so as to insulate surrounding tissue from the applied RF energy.