Fixation for leadless cardiac devices

An implantable leadless pacing delivery system comprising:

• an implantable leadless pacing device comprising:
• a power source;
• circuitry operatively coupled to the power source, the circuitry configured to pace a patient's heart and/or sense electrical activity of the patient's heart;
• a housing at least partially enclosing the circuitry;
• a first electrode secured to and exposed exterior to the housing;
• a fixation mechanism secured relative to the housing, the fixation mechanism comprising a tine configured to move between an elongated delivery configuration and a curved deployed configuration and radially offset from the first electrode;
• and
• a catheter configured to deliver the implantable leadless pacing device to a target location, the catheter comprising:
• a distal holding section including a body and a distal tip, the body defining a cavity, the cavity configured to receive the implantable leadless pacing device,
• a retention feature disposed within the cavity, the retention feature configured to bias the tine into the elongated delivery configuration,
• wherein the retention feature comprises a first end affixed to an inner wall of the body at a position spaced apart proximally from the distal tip, the retention feature having a second free end configured to contact the tine.

An implantable leadless pacing device comprising:

• a power source;
• circuitry operatively coupled to the power source, the circuitry configured to pace a patient's heart and/or sense electrical activity of the patient's heart;
• a housing at least partially enclosing the circuitry;
• a first electrode secured to and offset from a central longitudinal axis of the housing, the first electrode exposed exterior to the housing and extending distal of the housing;
• and
• a fixation mechanism secured relative to the housing, the fixation mechanism consisting of a single tine configured to move between an elongated delivery configuration with a free end of the tine pointed distally and a curved deployed configuration and radially offset from the first electrode;
• wherein a proximal end of the single tine is affixed to the housing at a central longitudinal axis of the housing and the first electrode is diametrically spaced from the single tine;
• wherein when in the curved deployed configuration, the single tine is configured to curve away from the first electrode with the free end of the single tine located proximal of a distalmost extent of the single tine.