Vertebral body expander

Abstract

The invention relates to a vertebral body expander. The vertebral body expander comprises an expander main body and an inner core, a plurality of annular convex parts can be arranged on a retaining part of the inner core, the multiple protruding parts are arranged in the axial direction of the inner core. Two annular inner convex parts are arranged on an inner hole of the sliding part of the expander main body; the sliding part can unidirectionally slide relative to the retaining part, so that a bracket part of the expander main body deviates relative to the axis of the expander main body, andthe expander main body is propped open; the two annular inner convex parts are arranged on the inner hole of the sliding part, so that the retaining effect can be guaranteed, and the axial length ofthe sliding part does not need to be increased additionally; a plurality of small protrusions and a plurality of small pits are arranged on the straight edges of the annular inward-protruding portionof the expander body and the annular protruding portion of the inner core respectively, the small protrusions are right embedded into the small pits, the annular protruding portion abuts against the straight edge of the annular inward-protruding portion, stability is improved, and the retaining effect is further improved.

Description

technical field [0001] The invention relates to the field of medical instruments, in particular to a vertebral body expander. Background technique [0002] Percutaneous vertebroplasty / percutaneous kyphoplasty is a common and mature minimally invasive spinal surgery. The treatment method is to inject bone cement into the vertebral body to increase the strength and stability of the vertebral body. Some patients with severe vertebral body collapse need to use expandable implants such as balloons or dilators to expand the collapsed vertebral body to form a cavity that can be filled with bone cement. [0003] In order to prevent the expansion of the dilator from shrinking and affecting the surgical effect, the existing vertebral body dilator is provided with a relative barbed tooth structure between the dilator body and the inner core. Although this barbed tooth structure can ensure a certain anti-retraction effect, However, due to processing and assembly precision problems, the...

AI Technical Summary

Problems solved by technology

[0003] In order to prevent the expansion of the dilator from shrinking and affecting the surgical effect, the existing vertebral body dilator is equipped with a relative barbed tooth structure between the dilator body and the inner core. Although this barbed tooth structure can guarantee a certain anti-retraction effect, However, due to processing and assembly precision problems, the inverted tooth structure sometimes cannot guarantee the anti-retraction effect

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