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Resistance to fluid flow through two spinal needles
1Department of Anaesthesia, Leeds General Infirmary.
Anaesthesia
|September 1, 1990
Summary
A new 120mm spinal needle shows threefold higher resistance than a 90mm needle, potentially due to a smaller internal diameter. This increased resistance may hinder identification of the subarachnoid space during anesthesia procedures.
Area of Science:
- Anesthesiology
- Medical Device Engineering
Background:
- Subarachnoid anesthesia requires precise needle placement.
- New medical devices are continually developed to improve anesthetic procedures.
Purpose of the Study:
- To evaluate the flow resistance of a new 120 mm, 26-gauge spinal needle.
- To compare its resistance characteristics with a standard 90 mm, 26-gauge needle.
Main Methods:
- Flow resistance was measured using a pressure monitor infusion pump.
- Resistance was compared between the 120 mm and 90 mm needles.
Main Results:
- The 120 mm needle exhibited a threefold increase in resistance compared to the 90 mm needle.
- This increased resistance is likely due to a reduced internal diameter, not solely length.
Conclusions:
- The new 120 mm spinal needle presents significantly higher flow resistance.
- This may impede the identification of the subarachnoid space via cerebrospinal fluid backflow.