The Observational Study will enroll a target of 198 subjects across two cohorts of 89 patients per cohort, with each cohort representing one catheter type. Retrospective patients previously treated with either a Hemo-Flow or Titan HD catheter will be enrolled. The primary endpoint of this study for all device families is insertion success. For the purposes of this data, a successful insertion will be defined as the successful initiation of vascular access device insertion, as determined by the investigator.
