Method of forming an electromagnetic sensing coil in a medical instrument for a surgical navigation system
First Claim
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1. For a surgical navigation system, a method of forming an electromagnetic sensing coil in a medical instrument, comprising:
- selecting a material to form a core for the medical instrument for the surgical navigation system;
forming the core from at least the selected material;
positioning a first layer of material over at least a portion of the core;
forming a coil about the core;
covering the coil and at least a portion of the first layer of material with a second layer of material; and
sealing an end portion of the core;
wherein the coil and the core are substantially electrically isolated from each other and an environment to form the electromagnetic sensing coil for the medical instrument for the surgical navigation system.
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Abstract
A surgical navigation system for navigating a region of a patient includes a non-invasive dynamic reference frame and/or fiducial marker, sensor tipped instruments, and isolator circuits. The dynamic reference frame may be repeatably placed on the patient in a precise location for guiding the instruments. The instruments may be precisely guided by positioning sensors near moveable portions of the instruments. Electrical sources may be electrically isolated from the patient.
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Citations
21 Claims
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1. For a surgical navigation system, a method of forming an electromagnetic sensing coil in a medical instrument, comprising:
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selecting a material to form a core for the medical instrument for the surgical navigation system; forming the core from at least the selected material; positioning a first layer of material over at least a portion of the core; forming a coil about the core; covering the coil and at least a portion of the first layer of material with a second layer of material; and sealing an end portion of the core; wherein the coil and the core are substantially electrically isolated from each other and an environment to form the electromagnetic sensing coil for the medical instrument for the surgical navigation system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. For a surgical navigation system, a method of forming an electromagnetic sensing coil in a medical instrument, comprising:
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selecting an electromagnetic permeable material to form a core for the medical instrument for the surgical navigation system; forming the core from at least the selected material; positioning a first layer of dielectric material over at least a portion of the core; forming a coil about the core over the first layer of material; covering the coil and at least a portion of the first layer of material with a second layer of dielectric material; and sealing an end portion of the core, the first layer of material and the second layer of material; wherein the coil and the core are substantially electrically isolated from each other and an environment with the first and second layers of material to form the electromagnetic sensing coil for the medical instrument for the surgical navigation system. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. For a surgical navigation system, a method of forming an electromagnetic sensing coil in a medical instrument, comprising:
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forming a core from at least a conductive permeable material, wherein forming the core includes forming at least one of a guidable portion of a stylet, a suction tube, a core for a probe, a core for a catheter, a core for an ablation tip, a core for a lens, and combinations thereof; positioning a first layer of dielectric material over at least a portion of the core; forming a first coil and a second coil about the core after positioning the first layer of material over the core, wherein the first layer of material is configured to isolate the coils from the conductive material of the core and the first coil is spaced apart a predetermined axial distance from the second coil; providing a compensation circuit to compensate for any error between a sensed signal from the first coil relative to a sensed signal from the second coil; covering the coils and at least a portion of the first layer of material with a second layer of material configured to isolate the coils from an exterior environment; and sealing a terminal end portion of the core, an end portion of the first layer adjacent the terminal end portion and an end portion of the second layer adjacent the end portion of the first layer. - View Dependent Claims (21)
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Specification