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Segment Information
 3 Months Ended
Mar. 31, 2023
Segment Reporting [Abstract]  
Segment Information Segment Information
We have two reportable segments organized according to our products and services: Medical devices and Preservation services. The Medical Devices segment includes external revenues from product sales of aortic stent grafts, On-X, surgical sealants, and other product revenues. Aortic stent grafts include aortic arch stent grafts, abdominal stent grafts, and synthetic vascular grafts. Aortic arch stent grafts include our E-vita Open NEO, E-vita Open Plus, AMDS, NEXUS, and E-vita Thoracic 3G. Abdominal stent grafts include our E-xtra Design Engineering, E-nside, E-tegra, E-ventus BX, and E-liac products. Surgical sealants include BioGlue Surgical Adhesive products. The Preservation Services segment includes external services revenues from the preservation of cardiac and vascular tissues. There are no intersegment revenues.
The primary measure of segment performance, as viewed by our management, is segment gross margin or net external revenues less cost of products and preservation services. We do not segregate assets by segment, therefore, asset information is excluded from the segment disclosures below.
The following table summarizes revenues, cost of products and preservation services, and gross margins for our operating segments (in thousands):
Three Months Ended
March 31,
20232022
Revenues:
Medical devices$62,291 $57,542 
Preservation services20,938 19,671 
Total revenues83,229 77,213 
Cost of products and preservation services:
Medical devices19,533 17,408 
Preservation services9,969 9,086 
Total cost of products and preservation services29,502 26,494 
Gross margin:
Medical devices42,758 40,134 
Preservation services10,969 10,585 
Total gross margin$53,727 $50,719 
The following table summarizes net revenues by product and service (in thousands):
Three Months Ended
March 31,
20232022
Products:
Aortic stent grafts$26,150$25,506
On-X17,65614,371
Surgical sealants16,70315,681
Other1,7821,984
Total products62,29157,542
Preservation services 20,93819,671
Total revenues$83,229$77,213