Disclosed herein is a system for delivering a leadless pacemaker having a housing with a proximal end. The system includes a guide catheter. The guide catheter includes a catheter shaft and a negative pressure attachment feature. The catheter shaft includes a distal end and a proximal end opposite the distal end. The negative pressure attachment feature is located at the distal end of the catheter shaft and configured to selectively negative pressure adhere with the housing of the leadless pacemaker.