Study on the blood flow characteristics of venous needle retention with different super-hydrophobic surface structures

Abstract

A venous retention needle, as an implanted device, is very likely to cause thrombosis. In view of the thrombosis phenomenon caused by retention needles, this paper compares the influence of different superhydrophobic surface retentions on blood flow. Compared with other superhydrophobic bulges, the fluid velocity of the four-prism bulge is the highest (0.08 m/s), and the vorticity and shear force of the hemispherical bulge are higher. A large number of vortices can inhibit thrombosis better. The tire vortices generated in the superhydrophobic convex grooves are important vortices to inhibit thrombosis. The enhancement and development of the tire vortex weakens the resistance near the wall of the needle and reduces the probability of platelet aggregation. The superhydrophobic surface structure studied in this paper can not only provide guidance for the design of venous retention needles with better performance but also provide corresponding technical support for the development of human implantation devices.

Keywords: Blood; Computational fluid dynamics; Super-hydrophobic surface; Vein retention needle.

Fig. 1

Model of vein retention needle flow field

Fig. 2

Simulated grid model

Fig. 3

Grid independence verification

Fig. 4

a After 90 min of contact with freshly prepared platelet-rich plasma, the two kinds superhydrophobic surface was observed by scanning electron microscopy; b enlargement of one structure on the left side; c enlarged view of the other on the right side [21]

Fig. 5

Velocity flow diagram of stranded needle surface (mm/s)

Fig. 6

Distribution of vorticity on the wall of needle

Fig. 7

Distribution of vortex core in needle

Fig. 8

Flow diagram of some areas on the surface near the bulge