GB994400A - Apparatus for detecting and localizing extraneous objects of electrically conductingor magnetically permeable material in human or animal tissue - Google Patents

Apparatus for detecting and localizing extraneous objects of electrically conductingor magnetically permeable material in human or animal tissue

Info

Publication number
GB994400A
GB994400A GB2777163A GB2777163A GB994400A GB 994400 A GB994400 A GB 994400A GB 2777163 A GB2777163 A GB 2777163A GB 2777163 A GB2777163 A GB 2777163A GB 994400 A GB994400 A GB 994400A
Authority
GB
United Kingdom
Prior art keywords
frequency
output
oscillator
apparatus
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2777163A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bang & Olufsen Produktionssels
Bang & Olufsen Produktionsselskab AS
Original Assignee
Bang & Olufsen Produktionssels
Bang & Olufsen Produktionsselskab AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DK313462A priority Critical patent/DK103580C/en
Priority to DK111663 priority
Application filed by Bang & Olufsen Produktionssels, Bang & Olufsen Produktionsselskab AS filed Critical Bang & Olufsen Produktionssels
Publication of GB994400A publication Critical patent/GB994400A/en
Application status is Expired legal-status Critical

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS
    • G01V3/00Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/15Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for use during transport, e.g. by a person, vehicle or boat
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/06Devices, other than using radiation, for detecting or locating foreign bodies ; determining position of probes within or on the body of the patient

Abstract

994,400. Locating foreign bodies. BANG & OLUFSEN PRODUKTIONSSELSKAB A.S. July 12, 1963 [July 13, 1962; March 11, 1963], No. 27771/63. Heading A5R. [Also in Division G1] Apparatus for detecting metallic objects in human or animal tissue comprises two electrical oscillators, a controlling coil for one of the oscillators being mounted in a feeler member, and automatic frequency control means, having a large time delay, which tends to keep the frequency of the other oscillator at a predetermined spacing from the first. An oscillator 2 is coupled with the search coil 1 and its output is passed through a frequency multiplier 3 and filter 4 to a mixing circuit 7 which also receives the output from an oscillator 5 through a filter 6. The beat frequency, which is preferably of the order of 400 c/s., is passed through a volume control 8 and amplifier 9 to an earpiece 10, so that if the search coil 1 is brought near to a metallic object the frequency of oscillator 2 is changed and the resultant change of output tone is apparent in the earpiece 10. In order to prevent the apparatus being influenced by large masses of metal in the vicinity of the patient, part of the output is passed through an amplifier 11 and counting device 12, 13, 14 to an automatic frequency control 15 which changes the frequency of oscillator 5 in such a way as to tend to maintain the original output tone constant. However, it does so with appreciable time delay so that although it corrects for large static metal masses, whereby they have no effect on the operation of the equipment, it does not influence the change in output tone resulting from the comparatively rapid movement of the search coil 1 in the vicinity of metal to be located. If the output frequency becomes so high that the circuit 12, 13, 14 cannot follow it, it passes through a high-pass filter 16 to actuate a relay 17 which applies to the A.F.C. circuit 15 a voltage of sufficient magnitude to restore the output to a frequency which the circuit 12, 13, 14 can accommodate.
GB2777163A 1962-07-13 1963-07-12 Apparatus for detecting and localizing extraneous objects of electrically conductingor magnetically permeable material in human or animal tissue Expired GB994400A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DK313462A DK103580C (en) 1962-07-13 1962-07-13 An apparatus for search and localization of foreign bodies of electrically or magnetically conductive material in the human or animal tissues.
DK111663 1963-03-11

Publications (1)

Publication Number Publication Date
GB994400A true GB994400A (en) 1965-06-10

Family

ID=26065257

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2777163A Expired GB994400A (en) 1962-07-13 1963-07-12 Apparatus for detecting and localizing extraneous objects of electrically conductingor magnetically permeable material in human or animal tissue

Country Status (1)

Country Link
GB (1) GB994400A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3211003A1 (en) * 1982-03-25 1983-10-13 Stefan Dr Kunke Method and apparatus for determining the position of a probe
EP0153021A1 (en) * 1984-01-23 1985-08-28 Ortho Pharmaceutical (Canada) Ltd Intrauterine device detection and removal system
WO1986002539A1 (en) * 1984-11-01 1986-05-09 Pekka Johannes Nyberg Device for localizing metal objects in a human or animal body
US4727866A (en) * 1984-01-23 1988-03-01 Ortho Pharmaceutical (Canada) Ltd. Intrauterine device detection and removal system
WO1990000030A1 (en) * 1988-07-01 1990-01-11 Koch Elektronik + Apparatebau Ag Measurement probe for locating metallic objects in the human or animal body
WO1998005255A1 (en) * 1996-08-02 1998-02-12 Kettner Karl Ulrich Device for protecting vessels during surgical interventions
EP1434062A2 (en) * 2002-12-27 2004-06-30 Firma Ing. Klaus Ebinger Method for detecting metal objects and metal detector

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3211003A1 (en) * 1982-03-25 1983-10-13 Stefan Dr Kunke Method and apparatus for determining the position of a probe
EP0153021A1 (en) * 1984-01-23 1985-08-28 Ortho Pharmaceutical (Canada) Ltd Intrauterine device detection and removal system
US4572162A (en) * 1984-01-23 1986-02-25 Ortho Pharmaceutical (Canada) Ltd. Method for the detection, location and extraction of an intrauterine device
US4727866A (en) * 1984-01-23 1988-03-01 Ortho Pharmaceutical (Canada) Ltd. Intrauterine device detection and removal system
WO1986002539A1 (en) * 1984-11-01 1986-05-09 Pekka Johannes Nyberg Device for localizing metal objects in a human or animal body
WO1990000030A1 (en) * 1988-07-01 1990-01-11 Koch Elektronik + Apparatebau Ag Measurement probe for locating metallic objects in the human or animal body
WO1998005255A1 (en) * 1996-08-02 1998-02-12 Kettner Karl Ulrich Device for protecting vessels during surgical interventions
EP1434062A2 (en) * 2002-12-27 2004-06-30 Firma Ing. Klaus Ebinger Method for detecting metal objects and metal detector
EP1434062A3 (en) * 2002-12-27 2005-06-15 Firma Ing. Klaus Ebinger Method for detecting metal objects and metal detector

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