Cannula position detection

Details Cannula position detection Cannula position detection

1993-09-17

1995-06-13

Rosenbaum, C. Fred

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604 67, 128DIG13, A61M 3100

Patent

active

054237432

ABSTRACT:
Bidirectional flow patterns are induced in a fluid supply line and the reverse flow resistance and the forward flow resistance are measured and compared. A measure of the resistance to flow is made by normalizing a sum of the entire pressure response about a pressure baseline according to the volume of fluid in the bidirectional flow pattern. In the event that the cannula is positioned near or against the vessel wall, the resulting relatively large negative pressure response can indicate the positional irregularity. In one embodiment, a time period of zero flow is included between the positive and negative flow volumes to permit the system to stabilize.

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T. S. Harris and W. W. von Maltzahn, "Infusion Line Model for the Detection of Infiltration, Extravasation, and other Fluid Flow Faults," IEEE Transactions On Biomedical Engineering, vol. 40, No. 2, Feb. 1993, pp. 154-162.

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