Device for converting a rotary motion into an oscillating motion

• US 20050283175A1
• Filed: 07/07/2005
• Published: 12/22/2005
• Est. Priority Date: 01/09/2003
• Status: Active Grant

• Current Assignee: DePuy Synthes Products LLC (Johnson & Johnson)
• Original Assignee: DePuy Synthes Products LLC (Johnson & Johnson)
• Inventors: Schmuckli, Nils, Tanner, Peter
• Granted Patent: US 8,562,635 B2
• Time in Patent Office: Days
• US Class Current: 606/178
• CPC Class Codes: A61B 17/1637 Hollow drills or saws producing a curved cut, e.g. cylindrical A61B10/025, A61B17/1695 take precedence
• CPC Class Codes: B27B 19/006 with oscillating saw blades; Hand saws with oscillating saw blades
• CPC Class Codes: B27B 5/30 for mounting or securing saw blades or saw spindles
• CPC Class Codes: F16H 21/40 for interconverting rotary motion and oscillating motion

Abstract

A device for converting a rotational movement into a rotatively oscillating movement is described comprising a drive shaft, a second, rotatively oscillating shaft, a driving mechanism, a housing, and a gearing mechanism comprising a movable lever. A sawing device is also described.

Claims

1. A device for treating a body site, comprising:

a drive shaft having a longitudinal axis, a rear end associable with a drive unit, a front end, a central borehole, and an eccentrically disposed pivot at the front end and having a central axis parallel to and offset from the longitudinal axis of the drive shaft;

an oscillating shaft having a longitudinal axis, a central borehole, a front end associable with a surgical tool or instrument, and a rear end;

a mechanism disposed between the front end of the drive shaft and the rear end of the oscillating shaft, for converting a rotational movement of the drive shaft into an oscillating movement of the oscillating shaft; and

a guide wire configured to extend through the central boreholes of the drive shaft and the oscillating shaft.

2. The device of claim 1, wherein the longitudinal axes of the drive shaft and oscillating shaft are substantially coaxial.

3. The device of claim 1, wherein the mechanism comprises a movable lever substantially transverse to the longitudinal axis of the drive shaft.

4. The device of claim 3, wherein the movable lever is fixedly connected to the pivot.

5. The device of claim 1, wherein at least a portion of both the drive shaft and the oscillating shaft are disposed in a housing.

6. The device of claim 1, wherein the surgical tool or instrument is detachably fastened to the oscillating shaft.

7. The device of claim 1, wherein the surgical tool or instrument has an axis substantially parallel to the longitudinal axis of the drive shaft.

8. The device of claim 1, wherein the mechanism causes the oscillating shaft to oscillate at an angle between about 0.05°

and about 10°

.

9. A device for positioning and operating a surgical tool or instrument, comprising:

a drive shaft having a longitudinal axis, a front end, a central borehole, and an eccentrically disposed pivot having a central axis parallel to and offset from the longitudinal axis of the drive shaft;

an oscillating shaft having a longitudinal axis, a central borehole, a front end associable with a surgical tool or instrument, and a rear end;

a movable lever substantially transverse to the longitudinal axis of the drive shaft and connected to the pivot; and

a guide wire configured to extend through the central boreholes of the drive shaft and the oscillating shaft;

wherein the oscillating shaft is connected to a catch, and wherein the movable lever engages the catch to oscillate the oscillating shaft;

wherein the device is configured to be lowered over the guide wire to position the device in relation to a body site.

10. The device of claim 9, wherein the surgical tool or instrument has an axis substantially parallel to the longitudinal axis of the drive shaft.

11. The device of claim 9, wherein the surgical tool or instrument is detachably fastened to the oscillating shaft.

12. The device of claim 9, wherein the longitudinal axes of the drive shaft and oscillating shaft are substantially coaxial.

13. The device of claim 9, wherein the movable lever comprises a recess for receiving at least a portion of the pivot.

14. The device of claim 9, wherein at least a portion of both the drive shaft and the oscillating shaft are disposed in a housing.

15. A method of treating a desired body site with a surgical tool or instrument, comprising the steps of:

(a) providing a device comprising;

a drive shaft having a longitudinal axis, a front end, a central borehole, and an eccentrically disposed pivot having a central axis parallel to the longitudinal axis of the drive shaft; and

an oscillating shaft having a central borehole, a front end associable with a surgical tool or instrument, and a rear end;

wherein the rotation of the drive shaft results in the oscillation of the oscillating shaft;

(b) attaching a guide wire to the desired body site;

(c) lowering the device over the guide wire, such that the guide wire extends through the central boreholes of the drive shaft and the oscillating shaft, and the device is positioned in a desired position relative to the desired body site;

(d) rotating the drive shaft to cause the oscillation of the oscillating shaft, thereby actuating the surgical tool or instrument in a oscillating manner to treat the desired body site.

16. The method of claim 15, where in step (b) comprises attaching the guide wire to a bone fragment.

17. The method of claim 15, wherein the device in step (c) is positioned so that the surgical tool or instrument contacts the desired body site.

18. The method of claim 15, wherein the guide wire has an axial stop configured to limit the movement of the device relative to the guide wire.

19. The method of claim 15, wherein the surgical tool or instrument comprises a saw blade configured to make arc-shaped cuts at the desired body site.

20. The method of claim 15, wherein the oscillating shaft oscillates at an angle of about 0.05°

to about 10°

.