Patent US2238292A successfully refreshed from Google Patents.
Patent EP0590178A1 successfully refreshed from Google Patents.
EP0590178A1
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EP
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Magnetic field detector
Assignee: Pacesetter AB
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Filing: 1992-09-29
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Granted: —
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Expires: 2012-09-29
Abstract
Abstract A magnetic field detector, particularly for implantable medical apparatuses, comprises a coil (2) mounted at the free end of a resilient member (18) fixed at its opposite end portion, and a detecting device (20; 40, 42, 44, 46; 48, 50, 52; 54, 56) for detecting, as a measure of the magnetic field, the movement of the coil when fed with an electric current from a controllable current source (8). The resilient member is bent to form at least two shanks interconnected at one end. The coil is mounted at the free end of one of the shanks and the resilient member is fixed at the free end portion of the other shank.
Inventors
- 👤 Christer Ekwall
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 09:14
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; G01R33/038; A; A61; A61B; A61B5/00; A61B5/06; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/365; A61N1/36514; A61N1/36542
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
117 words
A magnetic field detector, particularly for implantable medical apparatuses, comprising a coil (2) mounted at the free end of a resilient member (18) fixed at its opposite end portion, and a detecting device (20; 40, 42, 44, 46; 48, 50, 52; 54, 56) for detecting, as a measure of the magnetic field, the movement of the coil when fed with an electric current from a controllable current source (8), characterized in that said resilient member (18) is bent to form at least two shanks interconnected at one end, said coil (2) being mounted at the free end of one of the shanks and said resilient member being fixed at the free end portion of the other shank.
Claim 2
Dependent Claim
46 words
The detector according to claim 1, characterized in that a piezoelectric element (20) is applied to the resilient member (18) over the bend (22, 24) to give an electric signal representative of the bending of the member and thus of the movement of the coil (2).
Claim 3
Dependent Claim
56 words
The detector according to claim 2, characterized in that said resilient member (18) is bent into a U-shape and in that said coil (2) is mounted inside the U-shaped member at the free end of one of the shanks of the U-shape, said U-shaped member being fixed at the free end portion of its other shank.
Claim 4
Dependent Claim
41 words
The detector according to claim 2 and 3, characterized in that said piezoelectric element is formed as a sheet (20) of piezoelectric material applied to the outer side of the U-shaped member (18) over its bends (22, 24) and its web.
Claim 5
Dependent Claim
46 words
The detector according to claim 1 or 3, characterized in that said detecting device comprises a light source (42) directing a light beam towards a reflector (40) fixed to the coil (2) and means (46) for recording the movement of the reflected light beam (Fig. 6).
Claim 6
Dependent Claim
61 words
The detector according to claim 1 or 3, characterized in that said detecting device comprises a monochromatic light source (48) directing a light beam towards a reflector (40) fixed to the coil (2) and means (52) for recording the interference pattern (50) produced by incoming and reflected light to determine the movement of the coil from the interference pattern (Fig. 7).
Claim 7
Dependent Claim
43 words
The detector according to claim 1 or 3, characterized in that said detecting device comprises a variable capacitance device having one stationary condenser plate (54; 58) and one condenser plate (56) coupled to the coil (2) for moving together with it (Fig. 8).
Claim 8
Dependent Claim
26 words
The detector according to any one of the claims 1 - 7, characterized in that the current source (8) is supplying current pulses to the coil.
Claim 9
Dependent Claim
28 words
The detector according to claim 8, characterized in that the current pulses are square pulses supplied by the current source to the coil (2) through a capacitor (10).
Claim 10
Dependent Claim
43 words
The detector according to claim 9, characterized in that the capacitance value of the capacitor (10) is selected such that the electrical resonance frequency obtained together with the inductance of the coil (2) agrees with the mechanical resonance frequency for the mounted coil.
Claim 11
Dependent Claim
35 words
The detector according to any one of the claims 8 - 10, characterized in that the current source (8) is supplying an adjustable DC current to the coil (2) in addition to the current pulses.
Claim 12
Dependent Claim
22 words
The detector according to any one of the claims 1 - 11, characterized in that the coil (2) has a ferrite core.
References Cited (Backward Citations)
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