Staple geometry and device dimensions

Keep clip length, staple height and staple-line length separate.

For a conventional vascular clip, the vessel diameter should lie between one-third and two-thirds of the clip length. This is a vascular-clip guide. The clip system sets its own vessel-size limits.

The TA size describes staple-line length. The cartridge number describes open staple leg height. With conventional TA/DST cartridges, green staples go from 4.8 mm open to 2.0 mm closed, and blue from 3.5 to 1.5 mm. Both place two staggered rows. White vascular staples go from 2.5 to 1.0 mm and place three rows.

LDS means ligate–divide–staple. Regular staples measure 5.79 mm wide × 5.23 mm tall, or about 6 × 5 mm, with a closure width of 5.33 mm. Wide staples measure 8.0 × 7.2 mm, or about 8 × 7 mm, with a closure width of 7.3 mm. The device places a staple on each side and divides the tissue between them.

The classic GIA/DST cutter places two staggered rows on either side of its blade: four rows in total. That count belongs to this pattern; newer three-row-per-side systems use a different layout.

For the Ethicon CDH25B circular stapler, the combined compressed tissue range is 1.0–2.5 mm. Tissue outside that window falls outside this device specification. This is the combined thickness of both layers after compression, not the open leg height. Other circular systems have different specifications.

References

Johnston & Tobias, Veterinary Surgery: Small Animal, 2nd ed., ch. 16, Figs. 16.11–16.14 and Table 16.5; Tobias 2007, Vet Surg 36:341–349, doi:10.1111/j.1532-950X.2007.00275.x; Medtronic TA/DST and GIA/DST specifications; Ethicon CDH25B product specifications.