Tissue cutting dilator

The invention relates to a tissue cutting dilator. The tissue cutting dilator may include an elongate dilator body, a dilator tip, a plurality of retractable blades, and a cap. The dilator body may include a plurality of longitudinal guide slots along a distal portion of the dilator body. The dilator tip may be formed in a distal portion of the dilator body or coupled to a distal end of the dilator body. The dilator tip may include a plurality of blade slots. A blade may be disposed in the dilator body. The blade may be configured to extend through the blade slot in a ready-to-expand state of the dilator to cut tissue around the insertion site when inserted into the insertion site. The cover may be slidably disposed over the dilator body. The cover may cover the dilator tip at least in a ready-to-dilate state of the dilator. 本申请涉及组织切割扩张器。组织切割扩张器可包括细长扩张器主体、扩张器尖端、多个可缩回刀片和盖。扩张器主体可包括多个沿着扩张器主体的远侧部分的纵向引导狭槽。扩张器尖端可形成于扩张器主体的远侧部分中或联接至扩张器主体的远端。扩张器尖端可包括多个刀片狭槽。刀片可布置在扩张器主体中。刀片可配置为在扩张器的准备扩张状态下延伸穿过刀片狭槽，以在插入到插入部位时切割插入部位周围的组织。