Electrosurgical blade
View Patent ↗An electrosurgical blade includes a conductive element that is surrounded by an insulation layer except at a conductor edge portion of the conductive element. The conductor edge portion and insulation layer each have unique geometric shapes and composition of the parts to reduce or eliminate the production of smoke and eschar and reduce tissue damage. The outer profile of the insulation layer and conductive element are configured to facilitate the flow of electrosurgical decomposition products away from the conductor edge where they are formed.
1. An electrosurgical blade for conveying electrosurgical power to tissue to achieve a predetermined electrosurgical effect, comprising:
an electrically conductive element having a first section and a first tapered section terminating at a conductor edge;
an insulation layer having a second tapered section overlaying the entire conductive element which tapers against a side of the first tapered section to expose the conductor edge at a distalmost end of the blade, forming a primary reaction region, wherein the conductor edge at a distalmost end of the electrically conductive element is flush against the insulation layer; and
an electrical coupling surface for electrically coupling the electrically conductive element to a handle.
2. The electrosurgical blade as recited in claim 1 , wherein the thickness of the conductor edge is less than that of the first section.
3. The electrosurgical blade as recited in claim 2 , wherein at least a portion of the ratio of width of a first section to the conductor edge is at least 5:1.
4. The electrosurgical blade as recited in claim 2 , wherein at least a portion of the ratio of width of a first section to the conductor edge is 20:1.
5. The electrosurgical blade as recited in claim 1 , wherein the first tapered section includes at least one beveled surface.
6. The electrosurgical blade as recited in claim 5 , wherein the first tapered section includes two beveled surfaces.
7. The electrosurgical blade as recited in claim 6 , wherein at least a portion of the first tapered section has a concave shape.
8. The electrosurgical blade as recited in claim 7 , wherein at least a portion of the second tapered section has a concave shape.
9. The electrosurgical blade as recited in claim 7 , wherein at least a portion of the second tapered section insulation layer has a linear taper shape.
10. The electrosurgical blade as recited in claim 7 , wherein at least a portion of each side of the second tapered section insulation layer has a convex shape.
11. The electrosurgical blade as recited in claim 1 , wherein a tangent to the insulation at the conductor edge forms an angle with a centerline of the blade of less than about 60 degrees.
12. The electrosurgical blade as recited in claim 11 , wherein the conductor edge has a thermal conductivity characteristic of at least 0.0002 W/° K at about 300° K.
13. The electrosurgical blade as recited in claim 12 , wherein at least a portion of the conductor edge has a thickness less than about 0.0005 inches.
14. The electrosurgical blade as recited in claim 1 , wherein a tangent to the insulation at the conductor edge forms an angle with a centerline of the blade of less than about 45 degrees.
15. The electrosurgical blade as recited in claim 1 , wherein a tangent to the insulation at the conductor edge forms an angle with a centerline of the blade of less than about 20 degrees.
16. The electrosurgical blade as recited in claim 1 , wherein at least a portion of the conductor edge has a cross section that comes to approximately a point.
17. The electrosurgical blade as recited in claim 1 , wherein the conductor edge has a cross section that forms an acute angle.
18. The electrosurgical blade as recited in claim 1 , wherein at least a portion of the conductor edge has a thickness less than about 0.005 inches.
19. The electrosurgical blade as recited in claim 1 , wherein at least a portion of the conductor edge has a thickness less than about 0.002 inches.
20. The electrosurgical blade as recited in claim 1 , wherein at least a portion of the thickness of the insulation layer within the primary reaction region is at least one half the thickness of the conductor edge.
21. The electrosurgical blade as recited in claim 1 , wherein at least a portion of the thickness of the insulation layer within the primary reaction region is at least as thick as the conductor edge.
22. The electrosurgical blade as recited in claim 1 , wherein at least a portion of each side of the first tapered section extends radially inward and proximately intersects with one another at the conductor edge.
23. The electrosurgical blade as recited in claim 22 , wherein at least a portion of each side of the second tapered section extends radially inward and proximately intersects with one another at the conductor edge.
24. The electrosurgical blade as recited in claim 1 , wherein at least a portion of each side of the first tapered section extends linearly inward and proximately intersect with one another at the conductor edge.
25. The electrosurgical blade as recited in claim 24 , wherein at least a portion of each side of the second tapered section extends linearly inward and proximately intersect with one another at the conductor edge.
26. The electrosurgical blade as recited in claim 24 , wherein at least a portion of each side of the second tapered section extends radially outward and proximately intersect with one another at the conductor edge.
27. The electrosurgical blade as recited in claim 26 , wherein a tangent to the insulation at the conductor edge forms an angle with a centerline of the blade of less than about 45 degrees.
28. The electrosurgical blade as recited in claim 26 , wherein a tangent to the insulation at the conductor edge forms an angle with a centerline of the blade of less than about 20 degrees.
29. The electrosurgical blade as recited in claim 1 , wherein the electrosurgical blade is configured for single use.
30. The electrosurgical blade as recited in claim 1 , wherein the conductor edge is flush against the insulation layer to form a singular convex tapered section at the distalmost end of the blade.
31. A sterile package kit for use in performing an electrosurgical procedure, comprising:
a sterile package; and
a single use electrosurgical blade sealed within the sterile package, the single use electrosurgical blade comprising:
an electrically conductive element having a first section and a first tapered section terminating at a conductor edge;
an insulation layer having a second tapered section overlaying the entire conductive element which tapers against a side of the first tapered section to expose the conductor edge at a distalmost end of the blade, forming a primary reaction region, wherein the conductor edge at a distalmost end of the electrically conductive element is flush against the insulation layer; and
an electrical coupling surface for electrically coupling the electrically conductive element to a handle.
32. The sterile package kit according to claim 31 , further comprising printed instructions informing a user how to couple the single use electrosurgical blade to the handle.
33. The sterile package kit according to claim 31 , wherein the conductor edge is flush against the insulation layer to form a singular convex tapered section at the distalmost end of the blade.