Apparatus and method for bone morselization for surgical grafting

• US 7,431,230 B2
• Filed: 03/16/2005
• Issued: 10/07/2008
• Est. Priority Date: 03/16/2005
• Status: Active Grant

• Current Assignee: Medtronic Ps Medical Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Ps Medical Incorporated (Medtronic Plc)
• Inventors: Estes, Larry D., McPherson, Cameron N., Singer, Scott A.
• Primary Examiner(s): Rosenbaum; Mark
• Application Number:
  US11/081,230
• Publication Number:
  US 20060226267A1
• Time in Patent Office: 1,301 Days
• Field of Search: 241/283, 241/270, 241/169, 241/169.2, 241/30, 606/80, 606/102
• US Class Current: 241/30
• CPC Class Codes: A61F 2/4644 Preparation of bone graft, bone plugs or bone dowels, e.g. grinding or milling bone material bone material A61F2/28; disintegrating or milling devices B02C
• CPC Class Codes: A61F 2002/4681 by applying mechanical shocks, e.g. by hammering
• CPC Class Codes: B02C 1/12 Mills with non-rotating spiked members

Abstract

A bone morselization apparatus and method according to which a cutter bit is mounted to a casing containing a motor; and the casing is manually grasped and positioned over a plurality of bone segments. When the motor is activated, the cutter bit reciprocates and the bone segments are impacted by the cutter bit to morselize the segments.

Claims

1. An apparatus for morselizing bone segments, the apparatus comprising:

a casing;

a motor disposed in the casing and having a reciprocal output; and

a cutter bit having a longitudinally extending shaft coupled to the motor so as to reciprocate when driven by the motor to impact and morselize the segments, the cutter bit also having a circular base member fixed relative to the shaft, the circular base member having a lower surface defining a plane substantially normal to the longitudinally extending shaft with a plurality of cutting elements protruding therefrom,

the reciprocal output from the motor reciprocating both the shaft and the circular base member.

2. The apparatus of claim 1 wherein the cutter elements taper to a point in a direction from the base member.

3. The apparatus of claim 1 wherein the motor is a variable speed brushless dc motor configured to produce the reciprocal output.

4. The apparatus of claim 1 further comprising a collet mounted to the casing and coupled between the motor and the cutter bit to reciprocate the cutter bit upon activation of the motor.

5. The apparatus of claim 1 wherein the casing comprises a handle that can be manually grasped to position the cutter bit over the segments.

6. The apparatus of claim 1, wherein the cutter elements taper to a point in a direction from the base member, the cutter elements at the base member being spaced apart from each other along the lower surface of the base member.

7. The apparatus of claim 1, wherein the cutter elements have a greatest width adjacent the base member and taper in a direction from the base member, the cutter elements being spaced apart from each other such that a portion of the lower surface is disposed between adjacent cutter elements.

8. The apparatus of claim 1, wherein the cutter elements have a greatest width adjacent the base member and a height from the lower surface of the base member, the height being a distance about twice the greatest width.

9. An apparatus for morselizing bone segments, the apparatus comprising:

a pedestal;

an arm extending from the pedestal;

a motor disposed in the pedestal or the arm and having a reciprocal output; and

a cutter bit having a longitudinally extending shaft coupled to the motor so as to reciprocate when driven by the motor to impact and morselize the segments, the cutter bit also having a circular base member fixed relative to the shaft, the circular base member having a lower surface defining a plane substantially normal to the longitudinally extending shaft with a plurality of cutting elements protruding therefrom,

the reciprocal output from the motor reciprocating both the shaft and the circular base member.

10. The apparatus of claim 9 wherein the cutter elements taper to a point in a direction from the base member.

11. The apparatus of claim 9 wherein the motor is a variable speed brushless dc motor configured to produce the reciprocal output.

12. The apparatus of claim 9 further comprising a collet mounted to the arm and coupled between the motor and the cutter bit to reciprocate the cutter bit upon activation of the motor.

13. The apparatus of claim 9 wherein the arm is pivotally mounted to the pedestal to allow a vessel containing the segments to be positioned under the cutter bit.

14. The apparatus of claim 9, wherein the cutter elements taper to a point in a direction from the base member, the cutter elements at the base member being spaced apart from each other along the lower surface of the base member.

15. The apparatus of claim 9, wherein the cutter elements have a greatest width adjacent the base member and taper in a direction from the base member, the cutter elements being spaced apart from each other such that a portion of the lower surface is disposed between adjacent cutter elements.

16. The apparatus of claim 9, wherein the cutter elements have a greatest width adjacent the base member and a height from the lower surface of the base member, the height being a distance about twice the greatest width.

17. A method for morselizing bone segments:

mounting a cutter bit to a casing, the cutter bit having a longitudinally extending shaft and having a circular base member fixed relative to the shaft, the circular base member having a lower surface defining a plane substantially normal to the longitudinally extending shaft with a plurality of cutting elements protruding therefrom;

manually grasping the casing and positioning it over a plurality of the segments;

activating a motor to cause reciprocation of both the shaft and the circular base member of the cutter bit; and

impacting the segments with the cutter bit to morselize the segments.

18. The method of claim 17 further comprising mounting the motor in the casing, and coupling the output shaft of the motor to the cutter bit.

19. A method for morselizing bone segments comprising:

mounting an arm to a pedestal;

mounting a cutter bit to an arm, the cutter bit having a longitudinally extending shaft and having a circular base member fixed relative to the shaft, the circular base member having a lower surface defining a plane substantially normal to the longitudinally extending shaft with a plurality of cutting elements protruding therefrom;

positioning a vessel containing bone segments under the cutter bit;

activating a motor to cause reciprocation of both the shaft and the circular base member of the cutter bit; and

impacting the segments with the cutter bit to morselize the segments.

20. The method of claim 19 further comprising mounting the motor in the arm or the pedestal and coupling the output shaft of the motor to the cutter bit.