Patent · US Active

Rod system for gradual dynamic spinal fixation

US8992577B2 · kind B2 · utility

2Cited by

6References

16Claims

0Family size

Assignee

TONGJI UNIVERSITY · CN

Inventors

Liming Cheng · Shanghai, CN
Yan Yu · Shanghai, CN
Zhili Zeng · Shanghai, CN
Wei Xu · Putuo District, CN
Yongwei Jia · Shanghai, CN
Lie Qian · Shanghai, CN
Rui Zhu · Beijing, CN
Jianjie Wang · Shanghai, CN
Zhourui Wu · Shanghai, CN

Key dates

Filing date	Mar 13, 2014
Grant date	Mar 31, 2015
Priority date	—
Expiry date	Mar 19, 2034

Classification

Technology area (CPC A)Human Necessities
CPC primaryA61B2017/00004
WIPO fieldMedical technology
WIPO sectorInstruments

Abstract

A rod system includes two rods each with a head and a shaft, two elastic members each fitted around one shaft against one head, and a case defining a first inner portion, a second inner portion, and a third inner portion in communication with the first and the second inner portions. A first rod with a first elastic member is seated in the first inner portion so the first elastic member abuts the bottom of first inner portion and the first head protrudes into the third inner portion. A second rod and a second elastic member is seated in the second portion so the second elastic member abuts the bottom of the second inner portion and the second head protrudes into the third inner portion and abuts the first head.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.