EXPANDABLE DEVICE FOR BONE MANIPULATION

• US 20110098759A1
• Filed: 10/28/2009
• Published: 04/28/2011
• Est. Priority Date: 10/28/2009
• Status: Abandoned Application

• Current Assignee: Kyphon SARL (Medtronic Plc)
• Original Assignee: Kyphon SARL (Medtronic Plc)
• Inventors: Trieu, Hai H.
• Application Number:
  US12/607,829
• Publication Number:
  US 20110098759A1
• Time in Patent Office: Days
• US Class Current: 606/86.00R
• CPC Class Codes: A61B 17/7097 Stabilisers comprising fluid filler in an implant, e.g. balloon; devices for inserting or filling such implants disc prostheses made of inflatable chambers or pockets filled with fluid A61F2/441; replacing the nucleus pulposus A61F2002/444
• CPC Class Codes: A61B 17/8858 laterally or radially expansible inflatable A61B17/8855

Abstract

An expandable bone tamp for performing a minimally invasive surgical procedure includes a coil connected between an inner shaft and an outer shaft. Rotating the inner shaft relative to the outer shaft can then cause the coil to expand or collapse around the inner shaft. The coil allows large expansion forces to be generated by a structure Thant can pass through a small cannula. The rotation of the inner shaft relative to the outer shaft can be performed manually (e.g., via a crank handle) for good tactile control, or can be performed using a motor or other assist mechanism to increase the expansion force output. The coil can either be withdrawn after use, or can be left in the patient to provide additional post-procedure support.

Claims

1. A device for performing a surgical procedure, the device comprising:

an outer shaft;

an inner shaft rotatably disposed within the outer shaft;

a coil having a first end and a second end, the first end being coupled to the outer shaft, and the second end being coupled to the inner shaft; and

a rotational actuator for rotating the inner shaft relative to the outer shaft.

2. The device of claim 1, wherein rotating the inner shaft in a first direction relative to the outer shaft causes the coil to expand, and

wherein rotating the inner shaft in a second direction relative to the outer shaft causes the coil to collapse.

3. The device of claim 1, wherein the rotational actuator comprises at least one of a crank handle coupled to the inner shaft, a motor, a lead screw, a ball screw, a cable, and a gear train.

4. The device of claim 1, further comprising a holding mechanism for controllably maintaining a rotational orientation between the inner shaft and the outer shaft.

5. The device of claim 4, wherein the holding mechanism comprises at least one of a clamp, a ratchet, and a shaft collar.

6. The device of claim 1, wherein the coil comprises at least one of a shape memory material, a spring material, a Co—

Cr alloy, a biostable material, a bioresorbable material, a drug, and a bioactive agent.

7. The device of claim 1, wherein the coil comprises a plurality of turns;

each of the plurality of turns having a material cross section in the shape of one of one of a rectangle, a circle, an oval, a triangle, and a trapezoid.

8. The device of claim 1, wherein the coil comprises:

a first turn having a first material cross section; and

a second turn having a second material cross section,

wherein the first material cross section is different than the second material cross section in at least one of size and shape.

9. The device of claim 1, wherein the coil comprises:

a first turn; and

a second turn,

wherein the first turn and the second turn expand to a first size and a second size when the inner shaft is rotated in a first direction relative to the outer shaft, the second size being larger than the first size.

10. The device of claim 9, wherein the coil comprises a third turn,

wherein the third turn expands to a third size when the inner shaft is rotated in the first direction relative to the outer shaft, the third size being larger than the second size.

11. The device of claim 1, wherein the first end of the coil is coupled to the outer shaft by a first releasable connector, and

wherein the second end of the coil is coupled to the inner shaft by a second releasable connector.

12. The device of claim 1, wherein the first end of the coil is coupled to a first portion of the outer shaft, the first portion of the outer shaft being detachable from the outer shaft, and

wherein the second end of the coil is coupled to a first portion of the inner shaft, the first portion of the inner shaft being detachable from the inner shaft.

13. A system for performing a surgical procedure, the system comprising:

a cannula defining an interior lumen; and

an expandable bone tamp comprising;

an outer shaft;

an inner shaft rotatably disposed within the outer shaft; and

a coil having a first end and a second end, the first end being coupled to the outer shaft, and the second end being coupled to the inner shaft,

wherein the coil is sized to pass through the interior lumen when wound around the inner shaft by rotating the inner shaft in a first direction relative to the outer shaft, and

wherein the coil can be enlarged beyond a diameter of the interior lumen by rotating the inner shaft in a second direction relative to the outer shaft.

14. The system of claim 13, further comprising a rotational actuator for rotating the inner shaft with respect to the outer shaft, the rotational actuator comprising at least one of a crank handle coupled to the inner shaft, a motor, a lead screw, a ball screw, a cable, and a gear train.

15. The system of claim 13, wherein the coil comprises at least one of a shape memory material, a spring material, polyaryletheretherketone, a Co—

Cr alloy, a biostable material, a bioresorbable material, a drug, and a bioactive agent.

16. The system of claim 13, wherein the coil comprises a plurality of turns, each of the plurality of turns having a material cross section in the shape of one of one of a rectangle, a circle, an oval, a triangle, and a trapezoid.

17. The system of claim 13, wherein the coil comprises:

a first turn; and

a second turn,

wherein the first turn and the second turn expand to a first size and a second size when the inner shaft is rotated in a first direction relative to the outer shaft, the second size being larger than the first size.

18. The system of claim 13, wherein the coil is detachable from the expandable bone tamp.

20. The method of claim 18, wherein placing the coil in a bone comprises docking a cannula with the bone, the cannula defining an interior lumen, and positioning the coil in the bone through the interior lumen, and

wherein creating the cavity within the bone further comprises rotating the inner shaft in a second direction relative to the outer shaft to decrease the outer diameter of the coil and then withdrawing the coil through the interior lumen.

21. The method of claim 18, wherein filling the cavity with the bone filler material comprises delivering the bone filler material to the cavity while the coil is within the cavity.

19. A method for performing a surgical procedure, the method comprising:

placing a coil in a bone, wherein a first end of the coil is connected to an outer shaft, and wherein a second end of the coil is connected to an inner shaft, the inner shaft being rotatably disposed in the outer shaft;

creating a cavity within the bone by rotating the inner shaft in a first direction relative to the outer shaft to increase an outer diameter of the coil; and

filling the cavity with a bone filler material.