Implantable medical device fixation

An assembly comprising:

• an implantable medical device comprising:
• a plurality of electrodes;
• and
• circuitry configured to deliver cardiac pacing stimulation via the plurality of electrodes;
• and
• a set of fixation tines that are each deployable from a spring-loaded position to a hooked position, wherein each fixation tine of the set of fixations tines comprises a proximal end that is fixedly attached to a distal end of the implantable medical device in both the spring-loaded position and the hooked position,
• wherein each fixation tine of the set of fixation tines is positioned substantially equidistant from each other in a circular arrangement, wherein one of the electrodes is located at the distal end of the implantable medical device and is generally centered within the circular arrangement, wherein each fixation tine of the set of fixation tines extends from the implantable medical device at a longitudinal position that is proximal to the electrode, and
• wherein each fixation tine of the set of fixations tines comprises a super-elastic material and defines an oblong cross-section and is configured to have a column strength sufficient that a distal end of the tine penetrates cardiac tissue during deployment.

A kit comprising:

• an implantable medical device comprising:
• a plurality of electrodes;
• circuitry configured to deliver cardiac pacing stimulation via the plurality of electrodes;
• and
• a set of fixation tines that are each deployable from a spring-loaded position to a hooked position, wherein each fixation tine of the set of fixations tines comprises a proximal end that is fixedly attached to a distal end of the implantable medical device in both the spring-loaded position and the hooked position, wherein each fixation tine of the set of fixations tines comprises a super-elastic material and is configured to have a column strength sufficient that a distal end of the tine penetrates cardiac tissue during deployment;
• and
• a catheter forming a lumen sized to receive the implantable medical device and hold each fixation tine of the set of fixation tines in the spring-loaded position, wherein each fixation tine of the set of fixation tines is configured to be deployed from the spring-loaded position to the hooked position by releasing the fixation tine from the spring-loaded position and allowing the fixation tine to assume the hooked position, wherein the catheter includes an aperture to the lumen that is adjacent to the distal end of the catheter.