Spread of fluid: Role of tip configurations in needles

• Published in: Skin research and technology Vol. 24; no. 2; pp. 235 - 241
• Main Authors: Gomes, S., Drakidis, A., Silva, P., Lenau, T. A.
• Format: Journal Article
• Language: English
• Published: England John Wiley & Sons, Inc 01.05.2018
• Subjects: Channels; Configurations; fluid distribution; hypodermic needle; Hypodermic needles; multi‐channel needles; Needles; Plastic foam; Polymers; tip configurations; Tips; tip configurations; multi-channel needles; fluid distribution; hypodermic needle
• ISSN: 0909-752X; 1600-0846
• DOI: 10.1111/srt.12419

Background/purpose During the injection of a fluid in a tissue model, the fluid might be affected by the needle tip configuration and the number of channels. Thus, the objective of the present work is to observe the influence of different needle tips and number of channels on the spread of a fluid. Methods Fluid distribution data were obtained after injecting 0.3 mL of fluid into a foamed polymer model with a velocity of 2 mm/s. The spread area and the depth were determined for 3 different types of hypodermic needles: Single channel needles with bevel tip and blunt tip and a needle with conical tip and 3 internal channels. Results The bevel tip provides a higher spread in the direction where the bevel points and reaches larger depths than the other two needles. The spread for the blunt tip and the polymer needle is equally distributed on both sides of the needle. The largest horizontal area around the tip is achieved by the 3‐channel needle. Conclusion The tip configuration and number of channels have an influence on the distribution of fluid. The bevelled needle directs the fluid and reaches larger depths compared with the 3‐channel needle that gets more horizontal spread.