Surgery – Truss – Pad
Patent
1988-09-13
1990-03-06
Hanley, John C.
Surgery
Truss
Pad
128737, 600 13, 324219, 324239, A61B 612
Patent
active
049056980
ABSTRACT:
A method and apparatus (10) for determining accurately the location of the tip (14) of a catheter (16) inside biological tissue is disclosed including a locator (34) having a coil (38) wound axially on a core (36) and a detector (12) in the form of a coil (28) wound on a core (24) removably positionable within catheter (16) adjacent the tip (14). A controller (20) generates AC current to coil (38) to produce an electromagnetic field and compares it with the output voltage developed in coil ( b 28) when the locator (34) comes within close physical proximity to detecetor (12). Locator (34) includes an amber LED indicator (42) which is energized when the locator (34) is behind the detector (12) and the monitored output voltage is in phase with the generated alternating current and includes a red LED indicator (44) which is energized when the locator (34) is beyond the detector (12) and the monitored output voltage is 180.degree. out of phase with the generated alternating current. The controller (20) includes a beeper (48) which provides an audible indicator when energization changes between the indicators (42, 44).
REFERENCES:
patent: 3622784 (1972-11-01), Del Guercio
patent: 3659588 (1972-05-01), Kahn et al.
patent: 4416289 (1983-11-01), Bresler
patent: 4431005 (1984-02-01), McCormick
patent: 4432369 (1984-02-01), Halvorsen
patent: 4445501 (1984-05-01), Bresler
patent: 4572198 (1986-02-01), Codrington
Ferragamo Michael C.
Kay Donald A.
Shapiro Alan R.
Strohl, Jr. Clair L.
Whipple Gary R.
Hanley John C.
Pharmacia Deltec Inc.
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