Surgical knife
A surgical knife is provided. The knife has a blade, a handle, an elongated tube connected to the blade and the handle, and a sheath slidable over the tube and blade. The sheath is moveable from a first position that exposes the blade to and second position that conceals the blade. The blade, handle, and tube are in a fixed rigid relationship with each other while the sheath is movable.
1. A surgical knife comprising:
an elongated tube having a channel therethrough, the tube having a distal end and a proximal end;
a blade affixed to the distal end;
a handle comprising an actuator, wherein the handle is affixed to the proximal end, and wherein the blade, handle, and tube are in a fixed rigid relationship with each other; and
a sheath connected to a wire, wherein the sheath is retractably slidable over the tube and blade by the wire to expose the blade,
wherein the sheath is retracted and the blade is exposed in a first position and the sheath is extended and the blade is concealed in a second position, and
wherein the wire in the tube, the wire has a first end and a second end, and the wire is connected to the sheath at the first end and connected to the actuator at the second end.
2. The surgical knife according to claim 1 , wherein the sheath is operatively connected to the actuator.
3. The surgical knife according to claim 1 , wherein the tube is straight tube.
4. The surgical knife according to claim 1 , wherein the tube is a curved tube.
5. The surgical knife according to claim 1 , wherein the sheath is lockable in the first position.
6. The surgical knife according to claim 1 , wherein the sheath is lockable in the second position.
7. The surgical knife according to claim 1 , wherein the sheath or handle is made of plastic.
8. The surgical knife according to claim 1 , wherein the sheath or handle is made of metal.
9. The surgical knife according to claim 1 , wherein the blade is connected to the tube with a plurality of rivets.
10. The surgical knife according to claim 1 , wherein the blade is treated with at least one coating selected from the group consisting of: titanium carbide, zirconium nitride, titanium nitride, boron carbide, parylene, a silicon based coating, and a polymer based coating.
11. The surgical knife according to claim 1 , wherein the surgical knife is adapted for laparoscopic surgery.
12. The surgical knife according to claim 1 , wherein an end of the wire is attached to an inside surface of the sheath.
13. The surgical knife according to claim 12 , wherein the inside surface of the sheath comprises a protrusion and the wire attaches to the protrusion.
14. The surgical knife according to claim 13 , wherein the end of the wire is bifurcated and has a c-clip that attaches around the protrusion.
15. The surgical knife according to claim 1 , wherein the wire is flat.
16. The surgical knife according to claim 1 , wherein the tube is an s-curved tube.
17. The surgical knife according to claim 1 , wherein the sheath extends beyond the blade by at least about 0.020 inches.
18. The surgical knife according to claim 1 , wherein the actuator is a slide actuator.
19. A surgical knife comprising:
an elongated s-curved tube having a channel therethrough, the tube having a distal end and a proximal end;
a blade affixed to the distal end;
a handle affixed to the proximal end, wherein the blade, handle, and tube are in a fixed rigid relationship with each other; and
a sheath retractably slidable over the tube and blade to expose the blade,
wherein the sheath is retracted and the blade is exposed in a first position and the sheath is extended and the blade is concealed in a second position.
20. A surgical knife comprising:
an elongated tube having a channel therethrough, the tube having a distal end and a proximal end;
a blade affixed to the distal end;
a handle affixed to the proximal end, wherein the blade, handle, and tube are in a fixed rigid relationship with each other; and
a sheath retractably slidable over the tube and blade to expose the blade,
wherein the sheath is retracted and the blade is exposed in a first position and the sheath is extended beyond the blade by at least about 0.020 inches to conceal the blade in a second position.
21. A surgical knife comprising:
an elongated tube having a channel therethrough, the tube having a distal end and a proximal end;
a blade affixed to the distal end;
a handle affixed to the proximal end, wherein the blade, handle, and tube are in a fixed rigid relationship with each other;
a sheath slidable over the tube and blade, the sheath being at least as long as the blade,
a wire located in the tube, wherein the wire is connected to the sheath and connected to an actuator to commence movement of the wire in the tube; and
wherein the sheath is retracted and the blade is exposed in a first position and the sheath is extended and the blade is concealed in a second position.
22. The surgical knife according to claim 21 , wherein the actuator is located in the handle.
23. The surgical knife according to claim 21 , wherein the tube is a straight tube.
24. The surgical knife according to claim 21 , wherein the tube is an s-curved tube.
25. The surgical knife according to claim 21 , wherein the sheath is lockable in at least one of the first position and the second position.
26. The surgical knife according to claim 21 , wherein the actuator is a slide actuator.
27. The surgical knife according to claim 21 , wherein the wire is flat.