Mechanical cavity-creation surgical device and methods and kits for using such devices
A mechanical cavity-creation surgical device and methods and kits for using such devices is described. In one variation, the mechanical cavity-creation surgical device contains a side window at the distal end of a shaft that allows the articulation of a blade, pick, or tip from a position that is inside the shaft to a position that protrudes at least partially from the side window.
1 . An apparatus comprising:
a cutting element slidably disposed within a lumen of a shaft, wherein the cutting element includes a proximal end and a distal end; and
an actuating element having a proximal end and a distal end, wherein the distal end of the actuating element is operationally coupled to the proximal end of the cutting element such that when the actuating element is displaced the cutting element rotates and the distal end of the cutting element protrudes from a side window which is located at a distal portion of the shaft.
2 . The apparatus according to claim 1 , further comprising:
a ramp configured to direct the distal end of the cutting element to protrude from the side window when the actuating element is displaced distally.
3 . The apparatus according to claim 2 , wherein the ramp comprises a slanted surface positioned within the lumen of the shaft adjacent to the side window.
4 . The apparatus according to claim 3 , further comprising a guide in the lumen of the shaft to prevent the cutting element from clockwise and counter clockwise axial rotation in relation to an elongated axis along a length of the shaft.
5 . The apparatus according to claim 4 , wherein the guide further includes a slot.
6 . The apparatus according to claim 1 , wherein the cutting element comprises a curette tip.
7 . The apparatus according to claim 1 , wherein the actuating element comprises a plurality of rods slidably disposed within the lumen of the shaft.
8 . The apparatus according to claim 1 , wherein the cutting element is coupled to the actuating element through a hinge.
9 . The apparatus according to claim 8 , wherein the actuating element comprises a plurality of rods slidably disposed within the lumen of the shaft.
10 . The apparatus according to claim 9 , further comprising:
a ramp configured to direct the distal tip of the cutting element to protrude from the side window when the actuating element is displaced distally.
11 . The apparatus according to claim 10 , further comprising a guide in the lumen of the shaft to prevent the cutting element from clockwise and counter clockwise axial rotation in relation to an elongated axis along a length of the shaft.
12 . The apparatus according to claim 11 , wherein the cutting element comprises a blade.
13 . The apparatus according to claim 1 , wherein the cutting element is configured such that when the cutting element is in a retracted position the cutting element is located within the lumen of the shaft and substantially parallel to a length of the shaft, and when the cutting element is in a deployed position, the cutting element protrudes from the side window and is not parallel to the length of the shaft.
14 . The apparatus according to claim 1 , further comprising a handle and wherein the cutting element comprises a blade, pick, or tip that is remotely articulated by a device on the handle that can be manually manipulated.
15 . The apparatus according to claim 14 , further comprising a ramp that facilitates articulation of the blade, pick, or tip.
16 . The apparatus according to claim 14 , wherein the device comprises a wire that is used to articulate the blade, pick, or tip.
17 . The apparatus according to claim 16 , further comprising a wire guide.
18 . The apparatus according to claim 17 , wherein the wire guide occupies a portion that is less than half the lumen volume of the shaft.
19 . The apparatus according to claim 1 , wherein the shaft has a substantially uniform diameter through the length of the shaft and the shaft has an outer diameter that is about 0.25 to 0.35 cm in diameter.
20 . The apparatus according to claim 1 , further comprising a cap wherein the cap is removable.
21 . The apparatus according to claim 20 , wherein the cap is glued to a distal end of the shaft.
22 . The apparatus according to claim 21 , wherein the cap has a hole.
23 . A surgical instrument comprising a 1) shaft, 2) a cutting element and 3) a guide, the shaft having a lumen inside the shaft, the shaft having a proximal end and a distal end, the distal end of the shaft having a slot that runs essentially parallel to the shaft, the proximal end of the shaft connected to a handle, and the handle having an actuator wherein the actuator is operationally coupled to the guide such that when the actuator is manipulated by a user, the cutting element articulates from a position that is inside the lumen to a position protruding through the slot on the shaft.
24 . The surgical instrument according to claim 23 , wherein the cutting element is slidably disposed within the lumen of the shaft.
25 . The surgical instrument according to claim 24 , further comprising a ramp configured to deflect a distal portion of the cutting element and cause the cutting element to rotate when the cutting element is displaced distally towards the distal end of the shaft.
26 . The surgical instrument according to claim 23 , further comprising a cap.
27 . The surgical instrument of claim 26 , wherein the cap has a hole.
28 . The surgical instrument of claim 23 , wherein the shaft has a substantially uniform diameter through the length of the shaft and the shaft has an outer diameter that is about 0.25 to 0.35 cm in diameter.
29 . The surgical instrument of claim 26 , wherein the cap is removable.
30 . The surgical instrument of claim 23 , wherein the shaft is made of a nickel titanium alloy.
31 . The surgical instrument of claim 26 , wherein the shaft is made of a nickel titanium alloy.
32 . The surgical instrument of claim 28 , wherein the shaft is made of a nickel titanium alloy.
33 . The surgical instrument of claim 23 , wherein the slot is from about 1-15 mm in width.
34 . The surgical instrument of claim 32 , wherein the slot is from about 1-15 mm in width.
35 . A method of creating a cavity in a body region comprising:
inserting a distal portion of a shaft into a patient's body;
rotating a cutting element within a lumen of the shaft which results in a distal portion of the cutting element protruding from a side window on the shaft, wherein the side window is located on a circumferential surface at a distal portion of the shaft; and
rotating the shaft axially to score or scrape a body region within the patient's body to create a cavity.
36 . The method according to claim 35 , further comprising:
displacing the cutting element distally within the lumen of the cannula.
37 . The method according to claim 36 , further comprising having the cutting element engage a ramp.
38 . The method according to claim 35 , wherein inserting the distal portion of the shaft comprises inserting the distal portion of the shaft into a vertebral body through a pedicle.
39 . The method according to claim 35 , wherein the cutting element is a blade, tip or pick and the blade, pick, or tip is articulatable.
40 . The method according to claim 39 , wherein the blade, pick, or tip is made of a nickel titanium alloy.
41 . The method according to claim 39 , further comprising passing the shaft through a cannula.
42 . The method according to claim 39 , wherein the cavity is created in bone.
43 . The method according claim 42 , wherein the bone is a vertebra.
44 . The method according to claim 39 , wherein the shaft is not passed through a cannula.
45 . The method according to claim 44 , wherein the shaft also serves as a cannula.
46 . The method according to claim 45 further comprising checking a surgical site with an endoscope to see if sufficient scoring and/or scraping has occurred.