Drill with depth measurement system

Patent metadata

Field	Value
Publication number	US-9826984-B2
Application number	US-201615351936-A
Country	US
Kind code	B2
Filing date	Nov 15, 2016
Priority date	Sep 4, 2013
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

A measurement system and method for determining a depth of penetration of a working portion of a surgical instrument (e.g., a rotating drill bit in a bore). A first sensor outputs a first signal representative of a displacement of the leading edge of the drill bit in the bore. A second sensor outputs a second signal representative of a force applied to the leading edge of the drill bit. A processor outputs a third signal representative of the depth of penetration of the leading edge of the drill bit when the leading edge of the drill bit passes from a first medium having a first density to a second medium having a second density. The third signal is based on the first and second signals.

First claim

What is claimed is:

1. A drill comprising a drill bit penetration measurement system for determining, with respect to a reference point, a depth of penetration of a leading edge of a drill bit, the drill comprising:
a drill housing;
a drive assembly that engages a drill bit to rotate the drill bit about an axis of rotation;
a displacement sensing arm extending from the drill, wherein the displacement sensing arm is engageable with a bushing member that is constrainedly moveable along the axis of rotation with respect to the drill bit;
a displacement sensor for detecting relative movement between the displacement sensing arm and the drill bit in a direction along the axis of rotation;
a force sensor disposed within the drill housing in contact with the drive assembly for detecting a force acting on the drive assembly in a direction extending along the axis of rotation; and
a suspension member operatively engaged at a first end to the drill housing and at a second end to the drive assembly, wherein the suspension member engages the drive assembly to maintain the drive assembly stationary with respect to rotation about the axis of rotation but allows linear movement of the drive assembly along the axis of rotation.

2. The drill of claim 1 , wherein the drive assembly and the displacement sensor are in fixed relative positions relative to the axis of rotation.

3. The drill of claim 1 , wherein the suspension member is disposed within a handle of the drill housing.

4. The drill of claim 1 , wherein the displacement sensor is a linear variable differential displacement transducer.

5. The drill of claim 4 , wherein the force sensor is a load cell.

6. The drill of claim 1 , wherein the displacement sensor is disposed internally to the drill housing and the displacement sensing arm extends from the drill housing.

7. The drill of claim 6 , wherein at least a portion of the displacement sensing arm extends from the drill housing parallel to and offset from the axis of rotation.

8. The drill of claim 7 , wherein at least a portion the displacement sensing arm extends towards a drill bit engaged by the drive assembly.

9. A drill comprising a measurement system, the drill comprising:
a drill housing;
a drill drive comprising a motor for generation of rotational movement about an axis of rotation, the drill drive comprising a drive coupling and a chuck engagement portion;
a chuck that is removably engageable with the drill drive, the chuck comprising a chuck drive coupling operatively engageable with the drive coupling for imparting rotation of a drill bit engaged by the chuck when the chuck is engaged with the drill drive and a drive engagement portion removably engageable with the chuck engagement portion, wherein when the chuck is engaged with the drill drive, the drill drive and the chuck collectively comprise a rigid drill drive assembly for transfer of force acting on the drill bit along the axis of rotation through the rigid drill drive assembly;
a force sensor disposed within the drill housing in contact with the drive assembly for detecting a force acting on the rigid drill drive assembly in a direction extending along the axis of rotation; and
a suspension member operatively engaged at a first end to the drill housing and at a second end to the rigid drill drive assembly, wherein the suspension member engages the rigid drill drive assembly to maintain the rigid drill drive assembly stationary with respect to rotation about the axis of rotation but allows linear movement of the rigid drill drive assembly along the axis of rotation for engagement with the force sensor.

10. The drill of claim 9 , wherein the chuck engagement portion comprises a plurality of tabs disposed on the drill drive.

11. The drill of claim 10 , wherein the drive engagement portion comprises a plurality of slots corresponding to the plurality of tabs.

12. The drill of claim 11 , wherein the tabs are operatively engaged with a release for releasing the chuck from engagement with the drill drive.

13. The drill of claim 9 , wherein the chuck is operative to engage a drill bit in fixed axial relation to the chuck along the axis of rotation such that a force acting on the drill bit in a direction along the axis of rotation is transferred to the rigid drive assembly.

14. A hand held drill including a drill bit penetration measuring system for determining, with respect to a reference point, a depth of penetration of a leading edge of a drill bit in a bore, the drill comprising:
a hand held drill housing comprising a drive motor;
a chuck for engagement with a shank of a drill bit at a proximal portion thereof, wherein the chuck is operable to constrain a drill bit engaged by the chuck to limit relative axial movement relative to an axis of rotation about which the drill bit is rotated by the drive motor during drilling;
a displacement sensing arm extending from a passageway that is selectively opened from a proximal end thereof to a distal end thereof extending through the drill housing, the displacement sensing arm being freely moveable relative to the leading edge of the drill bit in a direction parallel to the axis of rotation and releaseably engageable with a bushing member that is constrainedly moveable along the axis of rotation with respect to the drill bit engaged by the chuck; and
a displacement sensor disposed in a fixed relative position with respect to the drill bit engaged by the chuck at least in a direction corresponding to the axis of rotation internally to the hand held drill housing, the displacement sensing arm being adapted for relative movement with respect to the displacement sensor such that the movement of the displacement sensing arm relative to the drill corresponds to displacement of the bushing relative to the drill bit engaged by the chuck, wherein the displacement sensor is operative to output a first signal representative of the displacement of the drill sensing arm relative to the displacement sensor;
a controller integrally provided with the hand held drill housing and comprising a display for display of a measured displacement of the leading edge of the drill bit relative to a reference point based on the first signal.

15. The drill of claim 14 , wherein the display comprises a touch sensitive display.

16. The drill of claim 15 , wherein the touch sensitive display comprises a user input for control of the controller.

17. The drill of claim 16 , wherein the touch sensitive display is used for selection of a mode of the drill.

18. The drill of claim 17 , wherein the mode comprises at least one of a bicortical mode and a unicortical mode.

19. The drill of claim 14 , wherein the display further includes an indication of a bore diameter being drilled, a drill speed, a drill direction, and a screw size indicator.

20. The drill of claim 14 , wherein the display is configured to present patient information.

Assignees

• Mcginley Eng Solutions Llc

Inventors

• Mcginley Joseph C
• Simmons Kevin D
• Privitera Peter A
• Sim Henry K
• Tanaka Shigeru
• Rinaldis David J
• Faulknor Graham R
• Leugers Martin A

Classifications

• A61B2090/0814

  Preventing re-use · CPC title

• A61B90/30

  Devices for illuminating a surgical field, the devices having an interrelation with other surgical devices or with a surgical procedure · CPC title

• A61B17/1626 Primary

  Control means; Display units · CPC title

• A61B17/1615

  Drill bits, i.e. rotating tools extending from a handpiece to contact the worked material · CPC title

• A61B2090/062

  penetration depth · CPC title