Pancake annunciator
First Claim
1. An annunciator for a medical device encapsulated within a casing and implantable in the body of a patient comprising:
- a magnetically permeable stationary ring member including an integral inwardly projecting peripheral flange having first and second opposed sides;
a first electrically conductive coil mounted on the peripheral flange adjacent the first side;
a second electrically conductive coil mounted on the peripheral flange adjacent the second side;
an oscillating member encompassed by the stationary ring member including a planar magnet member having first and second opposed surfaces of opposite polarity and first and second planar pole pieces mounted to the first and second surfaces, respectively, in a sandwich-like construction, the oscillating member having a longitudinal axis and being movable along the axis between a first extreme position whereat the first pole piece is proximate the peripheral flange and a second extreme position whereat the second pole piece is proximate the peripheral flange; and
axially compliant spider means extending between the oscillating member at the longitudinal axis and the ring member for biasing the oscillating member toward a neutral position intermediate the first and second extreme positions;
whereby cyclic energization of the first and second electrically conductive coils with an electrical current generates a cyclically alternating magnetic field which interacts with the magnetic field of the oscillating member to cause the oscillating member to oscillate between the first and second extreme positions.
1 Assignment
0 Petitions
Accused Products
Abstract
An annunciator for an implantable medical device encapsulated within a casing comprises a magnetically permeable stationary ring member including an integral inwardly projecting peripheral flange having opposed sides on which electrically conductive coils are mounted. An oscillating member encompassed by the stationary ring member includes a planar magnet member having opposed surfaces of opposite polarity and planar pole pieces are mounted to the first and second surfaces, respectively, in a sandwich-like construction. The oscillating member is movable along a longitudinal axis between extreme positions whereat the first pole piece, then the second pole piece is proximate the ring flange. Cyclic energization of the electrically conductive coils generates a cyclically alternating magnetic field, which interacts with the magnetic field of the oscillating member causing its oscillation between the first and second extreme positions. In another embodiment, the casing includes opposed walls and the first and second pole pieces impact against the opposed walls when the oscillating member reaches the first and second extreme positions, respectively. In another embodiment, opposed spider members have a central portion fixed to their respective polar pieces and a plurality of radially extending legs have terminal ends fixed, respectively, to the ring member at peripherally spaced locations, the spider members being axially compliant and biasing the oscillating member toward a neutral position and being substantially non-compliant transversely of the longitudinal axis for centering the oscillating member relative to the ring member throughout travel thereof between the first and second extreme positions.
24 Citations
15 Claims
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1. An annunciator for a medical device encapsulated within a casing and implantable in the body of a patient comprising:
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a magnetically permeable stationary ring member including an integral inwardly projecting peripheral flange having first and second opposed sides; a first electrically conductive coil mounted on the peripheral flange adjacent the first side; a second electrically conductive coil mounted on the peripheral flange adjacent the second side; an oscillating member encompassed by the stationary ring member including a planar magnet member having first and second opposed surfaces of opposite polarity and first and second planar pole pieces mounted to the first and second surfaces, respectively, in a sandwich-like construction, the oscillating member having a longitudinal axis and being movable along the axis between a first extreme position whereat the first pole piece is proximate the peripheral flange and a second extreme position whereat the second pole piece is proximate the peripheral flange; and axially compliant spider means extending between the oscillating member at the longitudinal axis and the ring member for biasing the oscillating member toward a neutral position intermediate the first and second extreme positions; whereby cyclic energization of the first and second electrically conductive coils with an electrical current generates a cyclically alternating magnetic field which interacts with the magnetic field of the oscillating member to cause the oscillating member to oscillate between the first and second extreme positions. - View Dependent Claims (2, 3, 4)
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5. In combination with a medical device encapsulated within a casing and implantable in the body of a patient, an annunciator comprising:
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a magnetically permeable stationary ring member fixed to the casing including an integral radially inwardly projecting peripheral flange having first and second opposed sides; a first electrically conductive coil mounted on the peripheral flange adjacent the first side; a second electrically conductive coil mounted on the peripheral flange adjacent the second side; an oscillating member encompassed by the stationary ring member including a planar magnet member having first and second opposed surfaces of opposite polarity and first and second planar pole pieces mounted to the first and second surfaces, respectively, in a sandwich-like construction, the oscillating member having a longitudinal axis and being movable along the axis between a first extreme position whereat the first pole piece is proximate the peripheral flange and a second extreme position whereat the second pole piece is proximate the peripheral flange; and axially compliant spider means extending between the oscillating member at the longitudinal axis and the ring member for biasing the oscillating member toward a neutral position intermediate the first and second extreme positions; whereby cyclic energization of the first and second electrically conductive coils with an electrical current generates a cyclically alternating magnetic field which interacts with the magnetic field of the oscillating member to cause the oscillating member to oscillate between the first and second extreme positions. - View Dependent Claims (6, 7, 8, 9)
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10. An activity sensor for a medical device encapsulated within a casing and implantable in the body of a patient comprising:
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a magnetically permeable stationary ring member including an integral inwardly projecting peripheral flange having first and second opposed sides; a first electrically conductive coil mounted on the peripheral flange adjacent the first side; a second electrically conductive coil mounted on the peripheral flange adjacent the second side; an oscillating member encompassed by the stationary ring member including a planar magnet member having first and second opposed surfaces of opposite polarity and first and second planar pole pieces mounted to the first and second surfaces, respectively, in a sandwich-like construction, the oscillating member having a longitudinal axis and being movable along the axis between a first extreme position whereat the first pole piece is proximate the peripheral flange and a second extreme position whereat the second pole piece is proximate the peripheral flange; whereby relative motion between the oscillating member and the conductive coils imparted by movement of the casing causes interaction of the coil with the magnetic field of the oscillating member to produce a voltage and a resulting current through the coil which is proportional to velocity, thereby detecting activity on the part of the patient.
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11. An annunciator for a medical device encapsulated within a casing and implantable in the body of a patient comprising:
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a magnetically permeable stationary ring member including an integral inwardly projecting peripheral flange having first and second opposed sides; a first electrically conductive coil mounted on the peripheral flange adjacent the first side; a second electrically conductive coil mounted on the peripheral flange adjacent the second side; a free floating oscillating member encompassed by the stationary ring member including a planar magnet member having first and second opposed surfaces of opposite polarity and first and second planar pole pieces mounted to the first and second surfaces, respectively, in a sandwich-like construction, the oscillating member having a longitudinal axis and being movable along the axis between a first extreme position whereat the first pole piece is proximate the peripheral flange and a second extreme position whereat the second pole piece is proximate the peripheral flange; whereby cyclic energization of the first and second electrically conductive coils with an electrical current generates a cyclically alternating magnetic field which interacts with the magnetic field of the oscillating member to cause the oscillating member to oscillate between the first and second extreme positions. - View Dependent Claims (12)
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13. In combination with a medical device encapsulated within a casing and implantable in the body of a patient, an annunciator comprising:
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a magnetically permeable stationary ring member fixed to the casing including an integral radially inwardly projecting peripheral flange having first and second opposed sides; a first electrically conductive coil mounted on the peripheral flange adjacent the first side; a second electrically conductive coil mounted on the peripheral flange adjacent the second side; a free floating oscillating member encompassed by the stationary ring member including a planar magnet member having first and second opposed surfaces of opposite polarity and first and second planar pole pieces mounted to the first and second surfaces, respectively, in a sandwich-like construction, the oscillating member having a longitudinal axis and being movable along the axis between a first extreme position whereat the first pole piece is proximate the peripheral flange and a second extreme position whereat the second pole piece is proximate the peripheral flange; whereby cyclic energization of the first and second electrically conductive coils with an electrical current generates a cyclically alternating magnetic field which interacts with the magnetic field of the oscillating member to cause the oscillating member to oscillate between the first and second extreme positions. - View Dependent Claims (14, 15)
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Specification