Cannulated hammer drill attachment

Patent metadata

Field	Value
Publication number	US-9532789-B2
Application number	US-201214241998-A
Country	US
Kind code	B2
Filing date	Nov 14, 2012
Priority date	Nov 14, 2012
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

A hammer drill attachment is provided for attachment to a bi-directional surgical drill. The hammer drill attachment is configured to provide a rotating output in a first direction of rotation when the drill is operated in its first direction of rotation, and the hammer drill attachment is configured to provide a hammering output when the drill is operated in its second direction of rotation.

First claim

What is claimed is:

1. A cannulated hammer drill attachment for a cannulated rotary drill having an output member rotatable in a first direction and in a second direction opposite the first direction, wherein the hammer drill attachment comprises: an input shaft configured to receive rotary motion from an output member of the rotary drill in each of the first direction and the second direction; an output shaft configured to output rotary motion or pulsed axial percussions; and a transmission connecting the input shaft with the output shaft, the transmission comprising: a first transmission member disposed in conjunction with the input shaft to receive corresponding rotary motion from the input shaft during rotation of the input shaft in each of the first direction of rotation and the second direction of rotation; and a second transmission member disposed in conjunction with the first transmission member and the output shaft, the second transmission member being configured to: during rotation of the input shaft in the first direction of rotation, transfer the rotary motion of the first transmission member to the output shaft, and during rotation of the input shaft in the second direction of rotation, convert the rotary motion of the first transmission member to pulsed axial percussions and transfer the pulsed axial percussions to the output shaft.

2. The cannulated hammer drill attachment of claim 1 , further comprising a device to prohibit rotary motion of the output shaft in the second direction of rotation during rotation of the input shaft in the second direction of rotation.

3. The cannulated hammer drill attachment of claim 1 , wherein:
the input shaft has a first end configured to be connected to an output member of a drill and a second end spaced apart from the first end;
the output shaft is in axial alignment with the input shaft and has a first end disposed adjacent the second end of the input shaft and a second end spaced apart from the first end;
the first transmission member is fixedly attached on the second end of the input shaft to rotate the first transmission member with the input shaft; and
the second transmission member is fixedly attached on the first end of the output shaft to move the output shaft with the second transmission member.

4. The cannulated hammer drill attachment of claim 3 , wherein:
the first transmission member comprises a first disc-shaped member disposed on the second end of the input shaft, the first disc-shaped member comprising:
a surface disposed towards the first end of the output shaft and having a peripheral edge, and
a plurality of teeth disposed on the surface adjacent at least the peripheral edge, wherein the teeth have a right-triangular cross-section in the peripheral direction with a face portion disposed at an angle to the surface and a leg portion disposed axially to the surface;

the second transmission member comprises a second disc-shaped member disposed on the first end of the output shaft, the second disc-shaped member comprising:
a surface disposed towards the surface of the first transmission member and having a peripheral edge, and
a plurality of teeth disposed on the surface adjacent at least the peripheral edge, wherein the teeth have a right-triangular cross-section in the peripheral direction with a face portion disposed at an angle to the surface and a leg portion disposed axially to the surface; and

the teeth on the surface of the first disc-shaped member are complementary to the teeth on the surface of the second disc-shaped member, wherein:
the leg portions of the teeth of the first disc-shaped member engage with the leg portions of the teeth of the second disc-shaped member during rotation of the input shaft in the first direction of rotation to rotate the second transmission member with the first transmission member, and
the face portions of the teeth of the first disc-shaped member slide over the face portions of the teeth of the second disc-shaped member during rotation of the input shaft in the second direction of rotation to axially displace the second transmission member with respect to the first transmission member to axially displace the output shaft.

5. The cannulated hammer drill attachment of claim 4 , further comprising a biasing member to provide biased engagement between the teeth on the surface of the first disc-shaped member and the teeth on the surface of the second disc-shaped member.

6. The cannulated hammer drill attachment of claim 4 , further comprising a housing, wherein:
the input shaft and first transmission member are axially fixed within the housing;
the output shaft and second transmission member are axially displaceable within the housing; and
the housing comprises a portion to engage with a body portion of a rotary drill to prohibit rotation of the attachment with respect to the drill.

7. The cannulated hammer drill attachment of claim 4 , further comprising:
a housing;
at least one first bearing disposed around the input shaft between the input shaft and the housing; and
at least one second bearing disposed around the output shaft between the output shaft and the housing, and configured to permit rotation of the output shaft in the first direction and prohibit rotation of the output shaft in the second direction of rotation.

8. The cannulated hammer drill attachment of claim 1 , wherein:
at least one of the first transmission member and the second transmission member comprises a disc-shaped member having a surface disposed towards the other of the first transmission member and the second transmission member, the surface comprising a plurality of teeth disposed annularly about an axis defined by the input shaft and the output shaft, wherein the teeth have a right-triangular cross-section in the annular direction with a face portion disposed at an angle to the surface and a leg portion disposed axially to the surface;
the other of the first transmission member and the second transmission member comprises at least one projection configured to:
engage with the leg portions of the teeth during rotation of the input shaft in the first direction of rotation to rotate the second transmission member with the first transmission member, and
glidingly move over the face portions of the teeth during rotation of the input shaft in the second direction of rotation to axially displace the output shaft; and

the attachment further comprises a biasing member to provide biased engagement between the teeth and the at least one projection.

9. The cannulated hammer drill attachment of claim 1 , wherein the attachment is cannulated for use with a cannulated surgical drill.

10. The cannulated hammer drill attachment of claim 1 , wherein the input shaft and output shaft are axially aligned and comprise an axial cannulation extending therethrough and configured to receive an elongated surgical implement therethrough.

11. A surgical drill kit comprising: a rotary cannulated drill having an output member rotatable in a first direction and in a second direction opposite the first direction, the output member having an axial bore therein; and a cannulated hammer drill attachment configured to be fixedly attached to the drill, the attachment comprising: a housing comprising an attachment portion to non-rotationally connect the housing to the drill; a cannulated input shaft configured to receive rotary motion from the output member of the drill, the input shaft comprising an axial bore; a cannulated output shaft axially aligned with the input shaft and configured to output rotary motion or pulsed axial percussions, the output shaft comprising an axial bore; and a transmission connecting the input shaft with

Assignees

• British Columbia Cancer Agency Branch

Inventors

• Coope Robin John Noel

Classifications

• A61B17/8625

  Shanks, i.e. parts contacting bone tissue · CPC title

• A61B17/1624 Primary

  Drive mechanisms therefor · CPC title

• A61B2017/00473

  Distal part, e.g. tip or head (A61B2017/00464 takes precedence) · CPC title

• A61B17/8685

  comprising multiple separate parts · CPC title

• A61B17/844 Primary

  with expandable anchors or anchors having movable parts · CPC title