151. Resistance to fluid flow through two spinal needles
- Author
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P. J. Toomey
- Subjects
business.industry ,Anesthesia, Spinal ,Anesthesiology and Pain Medicine ,medicine.anatomical_structure ,Cerebrospinal fluid ,Spinal needles ,Needles ,Regional anesthesia ,Anesthesia ,Pressure ,Fluid dynamics ,medicine ,Infusion pump ,Subarachnoid space ,Rheology ,business ,Biomedical engineering ,Backflow - Abstract
A new needle, 120 mm long and 26 gauge in diameter, has been introduced for subarachnoid anaesthesia. The resistance to flow through the needle was measured using a pressure monitor infusion pump and compared with the resistance to flow through a 90-mm 26-gauge needle; there was a threefold increase in resistance in the 120-mm needle compared to the 90-mm needle, which could not be explained by the difference in length alone and must reflect a decrease in the internal diameter of the long needle. This results in difficulty in identifying the subarachnoid space by backflow of cerebrospinal fluid. more...
- Published
- 1990
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