He's just suturing at that point.
There are a number of materials that you can use, each with various pros/cons. Generally, they're split up into synthetic (e.g. poliglecaprone) and natural (e.g. silk) materials, either monofilament or polyfilament (i.e. lots of fibres twisted around each other). You could then further subdivide into absorbable and non-absorbable.
Pretty much every surgery will have suturing of some variety, perhaps with exception of superficial and minor operations.