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1. (WO2001030249) METHOD AND APPARATUS FOR RATCHETING ADJUSTMENT OF BONE SEGMENTS

Pub. No.:    WO/2001/030249    International Application No.:    PCT/CH2000/000538
Publication Date: Fri May 04 01:59:59 CEST 2001 International Filing Date: Wed Oct 04 01:59:59 CEST 2000
IPC: A61B 17/00
A61B 17/66
A61B 17/80
Applicants: SYNTHES AG CHUR
SYNTHES (U.S.A.)
HAAG, Rene
Inventors: HAAG, Rene
Title: METHOD AND APPARATUS FOR RATCHETING ADJUSTMENT OF BONE SEGMENTS
Abstract:
A method and system for incremental adjustment of bone segments (20, 25) is provided. The apparatus includes a low-profile ratchet assembly (5) which may be subcutaneously implanted, and an adjustment assembly which may be inserted percutaneously for releasable engagement with the adjustment assembly. The ratchet assembly (5) includes a first piece having a tongue (33) which ratcheting serrations (35), and a second piece having a cavity to receive the tongue (33) and also including ratcheting pawls (70) to engage the serrations (35). The adjustment assembly may be threaded to engage a bore on the ratchet assembly (5). Alternatively, the adjustment assembly may have a sleeve (72, 91) which hooks onto the ratchet assembly and a plunger. Bio-absorbable materials may be used.