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Microscopic analysis of three different spinal needle tips after experimental subarachnoid puncture
R Puolakka1, L C Andersson, P H Rosenberg
1Department of Anaesthesiology, Helsinki University Central Hospital, Töölö Hospital, Finland.
Regional Anesthesia and Pain Medicine
|April 4, 2000
Summary
Microscopic analysis of spinal needles revealed that cutting Quincke-type needles caused more tissue damage during lumbar puncture than non-cutting designs. Modified Sprotte and Whitacre needles showed less tissue attachment, indicating a lower risk of foreign material introduction.
Area of Science:
- Neurosurgery
- Anesthesiology
- Medical Device Analysis
Background:
- Spinal needle tip design influences subarachnoid space contamination risk.
- Previous studies highlight the vulnerability of cutting-tip needles.
Purpose of the Study:
- Compare microscopic tissue damage between non-cutting pencil-point spinal needles (modified Sprotte, modified Whitacre) and a cutting Quincke-type needle.
- Assess the potential for foreign material introduction into the subarachnoid space.
Main Methods:
- Microscopic and fluorescence analysis of 27-gauge spinal needles (modified Quincke, Sprotte, Whitacre) after insertion into cadaveric lumbar interspaces (L2-5).
- Cadavers were prepared with fluorescein to visualize tissue particles.
- Needle tips were examined post-puncture, and cytocentrifuged smears were analyzed.
Main Results:
- Minimal needle tip damage observed (1 modified Quincke, 1 modified Whitacre).
- Visible fluorescent tissue particles were more frequent on modified Quincke needles (56%) than Sprotte (37%) or Whitacre (37%) needles.
- Cytocentrifugation revealed the most significant epithelioid cell and muscle fiber clusters with the Quincke needle, fewer with Whitacre, and minimal findings with Sprotte.
Conclusions:
- Tissue coring is a common occurrence during lumbar puncture.
- Cutting Quincke-type spinal needles demonstrate the most prominent tissue attachments, suggesting a higher risk of introducing foreign material into the subarachnoid space compared to non-cutting designs.