Inyundo y'umutekano, izwi kandi nk'inyundo yo kubaho, ni imfashanyo yo guhunga yashyizwe mu bice bifunze. Ubusanzwe yashyizwe mumodoka nibindi bice bifunze ahantu byoroshye kuboneka. Iyo imodoka nibindi bice bifunze bigaragara nkumuriro cyangwa kugwa mumazi nibindi byihutirwa, urashobora gukuramo byoroshye no kumenagura ibirahuri byimiryango nimiryango kugirango uhunge neza.
Ahanini ikoreshwa ryubuzima burokora inyundo conical tip, bitewe nisonga ryahantu ho guhurira ni nto cyane, iyo rero inyundo imennye ikirahure, aho ihurira ryumuvuduko wikirahure ni nini cyane (ibyo bikaba bisa nkibihame y'umusumari), kandi kugirango ikirahuri cyimodoka mumwanya nimbaraga nini yo hanze kandi gitange akajagari gato. Kubirahuri bituje, akantu gato ko kumeneka bivuze ko igice cyose cyikirahure cyo gukwirakwiza imbere imbere cyangiritse, bityo bikabyara ibice bitabarika bisa na cobweb mumwanya muto, muriki gihe mugihe inyundo yamenaguye buhoro buhoro inshuro nke kugirango ikureho ibice by'ikirahure.
Igice cyo hagati cyikirahure cyarakomeye nicyo gikomeye, kandi impande nu mpande nintege nke. Inzira nziza yo kubikora ni ugukoresha inyundo yumutekano kugirango ukande impande nu mfuruka yikirahure, cyane cyane hagati-igice kinini cyuruhande hejuru yikirahure.
Niba imodoka yigenga ifite inyundo yumutekano, igomba kubikwa muburyo bworoshye.