Ma introducer sheaths, omwe amadziwikanso kuti guiding sheaths, ndi zida zachipatala zomwe zimagwiritsidwa ntchito m'njira zosiyanasiyana kuti zithandizire kutsogolera ndikuyambitsa zida kapena zida zina m'thupi.Nthawi zambiri amapangidwa ndi zinthu zosinthika monga polyethylene kapena polyurethane.Ma sheaths oyambira amagwiritsidwa ntchito kwambiri pazamtima, radiology, ndi opaleshoni ya mitsempha.Amagwiritsidwa ntchito kuthandizira kuyika ma catheter, ma waya, kapena zida zina kudzera m'mitsempha yamagazi kapena zibowo zina zathupi.Ma sheaths amapereka njira yosalala ya zida, zomwe zimapangitsa kuti zikhale zosavuta komanso zotetezeka kulowetsamo.Ma sheaths oyambitsa amabwera mosiyanasiyana ndi makonzedwe kuti agwirizane ndi njira zosiyanasiyana zachipatala ndi zosowa zenizeni za wodwalayo.Nthawi zambiri amapangidwa ndi dilator pansonga kuti athandize kukulitsa chotengera kapena minofu panthawi yolowetsa.Ndikofunikira kuzindikira kuti kugwiritsa ntchito ma introducer sheaths ndi njira yachipatala yomwe iyenera kuchitidwa ndi akatswiri ophunzitsidwa bwino zachipatala.
