FIELD: medical engineering; instruments for ophthalmological surgical operations. SUBSTANCE: cystotom comprises handle and unward bent conically shaped knife with cutting portion at its end, sharpened on both sides and with sharp point. Novelty resides in that cutting portion comprises additional cutting member arranged on inner side of bent knife's tip. Additional cutting member is made in the form of pyramid truncated from its base on side of sharp point at an angle of 30 deg while side opposed point is cutting edge. To carry out surgical operation on posterior capsule of eye's crystalline lens using proposed instrument suffice it to make single puncture in eyeball wall. EFFECT: reduced traumatism during surgical operations. 4 dwg
