Abstract
Post-injection abscesses, unfortunately, still occur in the practice of veterinary medicine, which indicates the unresolved problem of the use of medicinal solutions to accompany both surgical intervention and postoperative therapy. Depending on the presence, nature and severity of defects in injection needles, they cause various damage to biological tissues when they are punctured. In the article, the authors describe the influence of the surface microstructure of various injection needles on the nature of tissue repair at the injection site. Established microdefects in disposable injection needles for disposable syringes of different volumes (bending of its needle tips and much more) can increase the traumatism of animal tissues during injections. This implies higher requirements in the production of disposable injection needles, which should be minimally traumatic to biological tissues, as well as to quality control of their manufacture (checking for sharpness and the presence or absence of burrs when viewed with more than 2.5-fold magnification). The issue of possible clogging of tissues at the injection site with dust microparticles, which are formed when disposable syringes and injection needles are removed from sterile packages made of uncoated medical paper and transparent film, is also considered. Dust microparticles could most likely be formed in the process of damage to that part of the package, which is made of uncoated medical paper (paper is more structured than film).