Document Detail

Use of a screw-syringe injector for cement delivery during kyphoplasty: technical report.
MedLine Citation:
PMID:  12925255     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: Percutaneous kyphoplasty is postulated to have several advantages over percutaneous vertebroplasty for the treatment of vertebral compression fractures and is gaining increased popularity. However, cement delivery with the KyphX kit (Kyphon, Inc., Santa Clara, CA), the only commercially available device for percutaneous kyphoplasty, is relatively problematic. This kit uses a series of "bone filler device" (BFD) tubes. Each BFD must be loaded manually with cement, which is then injected into the kyphoplasty cavity by manually depressing an inner stylet. The high profile of the BFD cannulas and their stylets requires frequent repositioning of the image intensifier tube and table. Because each accommodates only a small volume, the BFDs must be exchanged frequently. This delivery method also places the operator's hands directly in the field of radiation. We sought to overcome these limitations. METHODS: Dissatisfied with the shortcomings of the BFDs, we substituted the EZflow screw-syringe injector (Parallax Medical, Mountain View, CA) we use to deliver cement during conventional percutaneous vertebroplasty. This amalgam of the KyphX kit and the screw-syringe injector has been used for kyphoplasty treatment of 26 thoracolumbar compression fractures in 17 patients. RESULTS: The screw-syringe injector allows controlled volumetric delivery of large boluses of high-viscosity cement without having to refill the reservoir. It minimizes radiation exposure and does not require repositioning of the x-ray tubes. It may theoretically allow decompression should cement extrusion occur. Also, it delivers cement to the interstices of bony trabeculae outside the kyphoplasty cavity, thus combining the mechanical benefits of percutaneous kyphoplasty and percutaneous vertebroplasty. CONCLUSION: The use of a screw-syringe injector has several merits over the customary means of cement delivery during kyphoplasty.
Arun Paul Amar; Donald W Larsen; George P Teitelbaum
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Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  Neurosurgery     Volume:  53     ISSN:  0148-396X     ISO Abbreviation:  Neurosurgery     Publication Date:  2003 Aug 
Date Detail:
Created Date:  2003-08-19     Completed Date:  2003-09-17     Revised Date:  2005-11-16    
Medline Journal Info:
Nlm Unique ID:  7802914     Medline TA:  Neurosurgery     Country:  United States    
Other Details:
Languages:  eng     Pagination:  380-2; discussion 383     Citation Subset:  IM    
Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA.
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MeSH Terms
Bone Cements / therapeutic use*
Bone Screws*
Fracture Fixation, Internal / methods*
Lumbar Vertebrae / injuries*,  radiography,  surgery*
Spinal Cord Compression / etiology*,  radiography,  surgery*
Spinal Fractures / complications*,  radiography,  surgery*
Thoracic Vertebrae / injuries*,  radiography,  surgery*
Reg. No./Substance:
0/Bone Cements

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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