Apparatuses and methods for forming incisions in ocular tissue
A surgical tool includes a surgical blade configured to be moved to form an incision. The surgical tool also includes a wire configured to cause movement of the surgical blade. The surgical tool further includes an actuator configured to shorten a length of the wire to cause the movement of the surgical blade. The surgical tool could be configured to move the surgical blade in a first direction and then in a second direction in response to a single shortening of the wire. Also, the wire could represent a first wire, the surgical tool could include a second wire, and the surgical tool could be configured to move the surgical blade in a first direction in response to shortening the first wire and to move the surgical blade in a second direction in response to shortening the second wire.
1. A surgical tool comprising:
a surgical blade configured to be moved to form an incision;
a wire configured to cause movement of the surgical blade;
a central axle around which the wire is wrapped;
first and second springs configured to rotate the central axle in first and second directions, respectively;
first and second latches configured to secure and release the first and second springs, respectively;
a switch assembly configured to cause the first latch to release the first spring so that the central axle rotates in the first direction, the second latch configured to release the second spring so that the central axle rotates in the second direction; and
a plunger configured to return at least one of the springs to a location for re-securing by at least one of the latches.
2. The surgical tool of claim 1 , wherein the surgical tool further comprises:
first and second mechanical arms coupled to the plunger and configured to return the first and second springs to locations for re-securing by the first and second latches.
3. The surgical tool of claim 1 , wherein the switch assembly comprises a projection inserted into a slot of the first latch, wherein movement of the switch assembly moves the projection to cause the projection to rotate the first latch, releasing the first spring.
4. The surgical tool of claim 1 , wherein the first spring is configured to cause the central axle to move closer to the second latch.
5. The surgical tool of claim 4 , wherein the second latch is configured to release the second spring when triggered by the movement of the central axle towards the second latch.
6. The surgical tool of claim 1 , wherein the second spring is stronger than the first spring and causes the central axle to rotate in the second direction even when the first spring is not secured by the first latch.
7. The surgical tool of claim 6 , wherein:
the second spring is configured to cause an end of the first spring to return to the location where the end of the first spring is secured by the first latch; and
the plunger is configured to return an end of the second spring to the location where the end of the second spring is secured by the second latch.
8. The surgical tool of claim 1 , wherein the surgical tool further comprises:
a footplate configured to be placed on a patient's eye, the footplate comprising notches through which the surgical blade passes during rotation of the surgical blade.
9. The surgical tool of claim 1 , wherein the first and second latches are configured to physically contact the first and second springs, respectively, in order to secure the first and second springs.
10. A surgical tool comprising:
a wire configured to cause rotational movement of a surgical blade to form an incision;
a central axle around which the wire is wrapped;
first and second springs configured to rotate the central axle in first and second directions, respectively;
first and second latches configured to secure and release the first and second springs, respectively; and
a switch assembly configured to cause the first latch to release the first spring so that the central axle rotates in the first direction, the second latch configured to release the second spring so that the central axle rotates in the second direction.
11. The surgical tool of claim 10 , wherein the surgical tool further comprises:
a plunger configured to return at least one of the springs to a location for re-securing by at least one of the latches.
12. The surgical tool of claim 11 , wherein the surgical tool further comprises:
first and second mechanical arms coupled to the plunger and configured to return the first and second springs to locations for re-securing by the first and second latches.
13. The surgical tool of claim 11 , wherein:
the second spring is configured to cause an end of the first spring to return to the location where the end of the first spring is secured by the first latch; and
the plunger is configured to return an end of the second spring to the location where the end of the second spring is secured by the second latch.
14. The surgical tool of claim 10 , wherein the switch assembly comprises a projection inserted into a slot of the first latch, wherein movement of the switch assembly moves the projection to cause the projection to rotate the first latch, releasing the first spring.
15. The surgical tool of claim 10 , wherein:
the first spring is configured to cause the central axle to move closer to the second latch; and
the second latch is configured to release the second spring when triggered by the movement of the central axle towards the second latch.
16. The surgical tool of claim 10 , wherein the second spring is stronger than the first spring and causes the central axle to rotate in the second direction even when the first spring is not secured by the first latch.
17. The surgical tool of claim 10 , wherein the first and second latches are configured to physically contact the first and second springs, respectively, in order to secure the first and second springs.
18. A surgical tool comprising:
first and second springs configured to rotate a central axle in first and second directions, respectively, to impart first and second directional motion to a wire to thereby cause rotational movement of a surgical blade to form an incision;
first and second latches configured to secure and release the first and second springs, respectively; and
a switch assembly configured to cause the first latch to release the first spring so that the central axle rotates in the first direction, the second latch configured to release the second spring so that the central axle rotates in the second direction;
wherein the first spring is configured to cause the central axle to move closer to the second latch to thereby trigger the second latch to release the second spring; and
wherein the first and second latches are configured to physically contact the first and second springs, respectively, in order to secure the first and second springs.
19. The surgical tool of claim 18 , wherein the switch assembly comprises a projection inserted into a slot of the first latch, wherein movement of the switch assembly moves the projection to cause the projection to rotate the first latch, releasing the first spring.
20. The surgical tool of claim 18 , wherein the second spring is stronger than the first spring and causes the central axle to rotate in the second direction even when the first spring is not secured by the first latch.
21. The surgical tool of claim 20 , wherein:
the second spring is configured to cause an end of the first spring to return to the location where the end of the first spring is secured by the first latch; and
a plunger is configured to return an end of the second spring to the location where the end of the second spring is secured by the second latch.