Flexible coating for magnetic resonance imaging compatible invasive devices
First Claim
1. A medical invasive device intended for insertion into a subject immersed in a magnetic field during magnetic resonance imaging comprising a substantially rigid non-metallic material capable of shattering exhibiting a magnetic susceptibility in the magnetic field substantially equal to that of the subject being imaged, so as to cause minimal distortion in a magnetic resonance image, said device having an outer coating of a flexible material having a tensile strength capable of containing pieces of the device in the event of a fracture and allowing removal of all pieces of the invasive device from the subject when the device is withdrawn from the subject.
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Accused Products
Abstract
Invasive devices, such as laser fiber guides and biopsy needles, constructed of a material which exhibits little or no magnetic susceptibility, have a flexible polymer coating for retaining pieces of the device in the event of a fracture of the invasive device. The polymer coating also allows removal of the pieces of a fractured invasive device from the body of a subject without requiring surgery. The surgical instruments can be used inside a magnetic field during magnetic resonance (MR) imaging, thereby allowing interactive internal images to be produced and displayed to a surgeon during surgery. Since the invasive devices exhibit low susceptibility, they do not distort a created MR image.
157 Citations
14 Claims
- 1. A medical invasive device intended for insertion into a subject immersed in a magnetic field during magnetic resonance imaging comprising a substantially rigid non-metallic material capable of shattering exhibiting a magnetic susceptibility in the magnetic field substantially equal to that of the subject being imaged, so as to cause minimal distortion in a magnetic resonance image, said device having an outer coating of a flexible material having a tensile strength capable of containing pieces of the device in the event of a fracture and allowing removal of all pieces of the invasive device from the subject when the device is withdrawn from the subject.
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4. A method of producing a shatter-resistant invasive device intended to be used during magnetic resonance (MR) imaging of a subject and having a coating of a flexible material having a tensile strength capable of containing all pieces of the device in event of it fracturing comprising the steps of:
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a) constructing an invasive device of a rigid material capable of shattering and having a magnetic susceptibility substantially equal to that of said subject being imaged; b) placing shrinkable tubing of a material being flexible and having substantial tensile strength to contain sharp pieces of the invasive device in the event of fracture, over the invasive device substantially enclosing the invasive device; and c) shrinking the tubing causing it to form a coating which tightly conform to the invasive device. - View Dependent Claims (5, 6, 7, 8)
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9. A method of producing a shatter-resistant invasive device intended to be used during magnetic resonance (MR) imaging of a subject and having a coating of a flexible material having a tensile strength capable of containing all pieces of the device in event of its fracture comprising the steps of:
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a) constructing an invasive device of a substantially rigid material capable of shattering having a magnetic susceptibility substantially similar to that of said subject; b) dissolving a flexible coating material in a solvent to form a solution; c) applying the solution to the invasive device by spraying, painting or dipping the invasive device; and d) drying the invasive device so as to leave a tightly conforming flexible coating on the invasive device. - View Dependent Claims (10)
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11. A method of producing a shatter-resistant invasive device intended to be used during magnetic resonance (MR) imaging of a subject and having a coating of a flexible material having a tensile strength capable of containing all pieces of the device in event of its fracture comprising the steps of:
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a) constructing an invasive device of a substantially rigid material capable of shattering having a magnetic susceptibility substantially similar to that of said subject; b) heating a flexible coating material into a non-viscous state; c) applying the coating material to the invasive device by spraying, painting or dipping the invasive device; and d) allowing the coating to cure so as to leave a tightly conforming flexible coating on said invasive device.
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Specification