Needle having multiple electrodes
First Claim
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1. An electromyopraphic needle comprising:
- a shaft having a distal sharpened tip portion;
first, second and third concentrically arranged electrodes;
first and second insulation layers for separating the first and second electrodes and the second and third electrodes, respectively; and
wherein the shaft has a substantially constant outer diameter proximally of and adjacent to the distal tip portion of the needle and wherein the third electrode is distanced from the distal tip portion and at least partly defines the outer diameter of the shaft proximally of and adjacent to the distal tip portion.
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Abstract
Embodiments of the invention generally relate to needles having more than one electrode and which are particularly suited for use in electromyography. One embodiment relates to a tripolar needle having three concentric electrodes. The tripolar needle is formed by providing a needle blank having first and second concentric electrodes and forming a third concentric electrode around the needle blank. The tripolar needle has an outer diameter which is substantially constant along the shaft of the needle, except at the tip, where the needle is sharpened.
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Citations
36 Claims
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1. An electromyopraphic needle comprising:
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a shaft having a distal sharpened tip portion; first, second and third concentrically arranged electrodes; first and second insulation layers for separating the first and second electrodes and the second and third electrodes, respectively; and wherein the shaft has a substantially constant outer diameter proximally of and adjacent to the distal tip portion of the needle and wherein the third electrode is distanced from the distal tip portion and at least partly defines the outer diameter of the shaft proximally of and adjacent to the distal tip portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. An electromyoaraphic needle comprising:
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a shaft having a sharpened distal tip portion; first, second and third concentrically arranged electrodes, the first electrode forming a core of the needle at least at the tip portion; at least one insulation layer separating the first, second and third electrodes; and wherein the third electrode at least partly defines an outer diameter of the shaft proximally of the distal tip portion and the second electrode has an exposed frustoconical surface at the distal tip portion. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification