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The present disclosure pertains to medical devices, and methods for manufacturing and/or using medical devices. More particularly, the present disclosure pertains to leadless cardiac devices and methods, such as leadless pacing devices and methods, and delivery devices and methods for such leadless devices. BACKGROUND

A wide variety of medical devices have been developed for medical use, for example, cardiac use. Some of these devices include catheters, leads, pacemakers, and the like, and delivery devices and/or systems used for delivering such devices. These devices are manufactured by any one of a variety of different manufacturing methods and may be used according to any one of a variety of methods. Of the known medical devices, delivery systems, and methods, each has certain advantages and disadvantages. There is an ongoing need to provide alternative medical devices and delivery devices as well as alternative methods for manufacturing and using medical devices and delivery devices.

In a first example, a catheter system for carrying an implantable leadless pacing device may comprise a tubular member including a lumen extending from a proximal end to a distal end thereof, a tubular distal holding structure extending distally of the distal end of the tubular member and defining a cavity, a leadless pacing device located at least partially within the cavity and having a proximal electrode and a distal electrode, and an electrical barrier at an axial location between the proximal electrode and the distal electrode of the leadless pacing device. The electrical barrier inhibits electrical signals of the leadless pacing device from traveling within the tubular distal holding structure between the proximal electrode of the leadless pacing device and the distal electrode of the leadless pacing device.

Alternatively or additionally to any of the examples above, in another example, the catheter system may comprise an electrical port extending through the tubular distal holding structure at a location proximal of the proximal electrode of the leadless pacing device.

Alternatively or additionally to any of the examples above, in another example, the catheter system may comprise a hub secured to the tubular member and a body portion secured to the hub and extending distally from the hub, wherein the body portion at least partially defines the cavity.

Alternatively or additionally to any of the examples above, in another example, the electrical barrier is a ring filling a radial space between an outer surface of the leadless pacing device and an inner surface of the tubular distal holding structure.

Alternatively or additionally to any of the examples above, in another example, the electrical barrier comprises a non-conductive gel filler at least partially filling a radial space between an exterior surface of the leadless pacing device and an inner surface of the tubular distal holding structure.

Alternatively or additionally to any of the examples above, in another example, the electrical barrier has a first portion having a first tension or stiffness and a second portion having a second tension or stiffness different than the first tension or stiffness.

Alternatively or additionally to any of the examples above, in another example, the first tension or stiffness is less than the second tension or stiffness and the first portion flexes or deflects to allow a fluid to pass through the electrical barrier in response to applying a pressure greater than a threshold pressure to the first portion.

Alternatively or additionally to any of the examples above, in another example, the distal holding structure comprises a reduced diameter portion of the tubular distal holding structure circumferentially contacting the leadless pacing device to form the electrical barrier.

Alternatively or additionally to any of the examples above, in another example, the braid is made from nitinol and the reduced diameter portion is configured to change shape in response to a pressure greater than a threshold pressure being applied to a proximal side of the reduced diameter portion.

In another example, a catheter for carrying an implantable leadless pacing device may comprise a tubular member including a lumen extending from a proximal end to a distal end thereof, a tubular distal holding structure extending distally of the distal end of the tubular member and defining a cavity, an electrical port extending through a proximal portion of the tubular distal holding structure, and an electrical barrier at an axial location between the proximal portion and a distal portion of the tubular distal holding structure. The electrical barrier inhibits electrical signals from crossing the axial location of the electrical barrier when a leadless pacing device is received within the tubular distal holding structure.

Alternatively or additionally to any of the examples above, in another example, the electrical barrier is actuatable to allow a fluid to cross an axial location of the electrical barrier when a leadless pacing device is received within the tubular distal holding structure.

Alternatively or additionally to any of the examples above, in another example, the catheter may comprise a hub attached to and extending distally from the tubular member and a body portion attached to and extending distally from the hub, wherein the electrical port extends through one or more of the hub and the body portion to allow electrical signals to pass from interior the tubular distal holding structure to exterior the tubular distal holding structure.

In another example, a method of directing electrical signals from a leadless pacing device received in a tubular distal holding structure attached to a distal end of a tubular member comprises emitting electrical signals from a first electrode of a leadless pacing device received in a tubular distal holding structure of a delivery catheter, directing the emitted electrical signals exterior of the distal holding structure through electrical ports in the tubular distal holding structure at a location proximal of the first electrode of the leadless pacing device, and receiving the emitted electrical signal directed exterior of the distal holding structure at a second electrode of the leadless pacing device within the distal holding structure, wherein the second electrode of the leadless pacing device is located distal of the first electrode of the leadless pacing device.

Alternatively or additionally to any of the examples above, in another example, the method may comprise directing the emitted electrical signals through the electrical ports using an electrical barrier to inhibit signals from traveling within the tubular distal holding structure between the first electrode of the leadless pacing device and the second electrode of the leadless pacing device.

The above summary of some embodiments is not intended to describe each disclosed embodiment or every implementation of the present disclosure. The Figures, and Detailed Description, which follow, more particularly exemplify some of these embodiments. BRIEF DESCRIPTION OF THE DRAWINGS