Control system for retrograde drill medical device

Patent metadata

Field	Value
Publication number	US-10695073-B2
Application number	US-201715683434-A
Country	US
Kind code	B2
Filing date	Aug 22, 2017
Priority date	Aug 22, 2017
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

A rotary, cutting medical device configured to be used during surgeries, such as ACL reconstruction, to drill holes and retrograde sockets is disclosed. The device may include a blade at a distal end that is movable between a first position aligned with a longitudinal axis of the device and a second position nonparallel to the longitudinal axis used to create retrograde sockets. The device may include a blade position control system connecting the blade to distal ends of both the outer tube and inner shaft and configured to control movement of the blade between first and second positions for drilling a hole and then creating a retrograde socket. The device may include a position retention system configured to retain the blade in the second position while allowing the inner shaft and blade to rotate to cut the socket.

First claim

We claim:

1. A rotary cutting device comprising:
an elongated body having a distal end, a proximal end, and a longitudinal axis, the elongated body further comprising an outer tube and an inner shaft housed by the outer tube;
a blade at the distal end of the body, wherein the blade is configured to rotate from a first position generally aligned with the longitudinal axis to a second, flip position which is nonparallel with the longitudinal axis; and
a blade position control system connecting the blade to distal ends of both the outer tube and inner shaft, wherein the blade position control system comprises:
a connection system connecting the inner shaft to the blade that allows the blade to move from the first position generally aligned with the longitudinal axis to the second, flip position which is nonparallel with the longitudinal axis and a cutting arris of the blade is exposed toward the proximal end of the elongated body for retrograde drilling of a hole when the blade is locked in the second, flip position;
a cam in communication with a cam follower and in communication with the inner shaft for moving the blade into first and second positions;
a position retention system configured to retain the cam in a second position such that the inner shaft is retained in the second position, thereby retaining the cutting arris of the blade in position such that the cutting arris is exposed toward the proximal end of the elongated body for retrograde drilling of a hole while allowing the inner shaft and blade to rotate; and
wherein the position retention system is configured such that the cam follower includes a first position retainer configured to retain the cam in a first position, which also retains the blade in a position generally aligned with the longitudinal axis, and a second position retainer configured to retain the cam in a second position in which the cutting arris of the blade is positioned such that the cutting arris is exposed toward the proximal end of the elongated body while allowing the inner shaft and blade to rotate for retrograde drilling of a hole, wherein the first position retainer is formed from a flat surface on the cam generally orthogonal to the longitudinal axis of the elongated body, which also retains the blade in a position generally aligned with the longitudinal axis, and wherein the second position retainer is formed from a flat surface on the cam generally orthogonal to the longitudinal axis of the elongated body.

2. The rotary cutting device of claim 1 , wherein the position retention system includes at least one pin extending from the cam.

3. The rotary cutting device of claim 2 , wherein the position retention system includes at least one groove on the inner shaft for receiving the at least one pin extending from the cam such that the inner shaft is rotatable while the at least one pin resides in the at least one groove on the inner shaft, thereby preventing axial movement of the inner shaft.

4. The rotary cutting device of claim 3 , wherein the position retention system includes at least one slot in the cam for receiving the at least one pin to account for potential misalignment between the pin, cam and at least one groove on the inner shaft.

5. The rotary cutting device of claim 1 , wherein the cam is formed from a first head member and a second head member separated by a tube receiving chamber configured to receive the inner shaft extending therethrough.

6. The rotary cutting device of claim 1 , wherein the engaging surface of the cam follower between the first and second position retainers is nonorthogonal relative to the longitudinal axis of the elongated body.

7. The rotary cutting device of claim 1 , wherein the second position retainer is positioned closer to the distal end of the elongated body than the first position retainer.

8. The rotary cutting device of claim 1 , further comprising a third position retainer positioned between the first and second retainers for retaining the cam in a third position in which the blade is positioned between the first and second positions.

9. The rotary cutting device of claim 1 , further comprising a fourth position retainer positioned between the first and third retainers for retaining the cam in a fourth position which corresponds to a blade position between 10 degrees and 40 degrees.

10. The rotary cutting device of claim 1 , further comprising a fifth position retainer positioned between the second and third retainers for retaining the cam in a fifth position between which corresponds to a blade position 50 degrees and 80 degrees.

11. The rotary cutting device of claim 1 , further comprising a housing configured to retain the cam in position whereby the housing includes an inner side surface that houses the cam to prevent the cam from being inadvertently displaced and to limit rotation of the cam about only one axis.

12. The rotary cutting device of claim 1 , further comprising a biasing mechanism configured to bias the cam follower towards the cam to keep the cam follower in contact with the cam and configured to bias the inner shaft toward the distal end of the elongated body.

13. The rotary cutting device of claim 1 , further comprising a drive hub positioned at the proximal end, wherein the drive hub is configured to place the inner shaft in mechanical communication with a handpiece to impart rotary motion to the inner shaft and blade, as controlled by controls on the handpiece.

14. The rotary cutting device of claim 13 , wherein the position retention system includes at least one slot in the cam for receiving the at least one pin to account for potential misalignment between the pin, cam and at least one groove on the inner shaft.

15. The rotary cutting device of claim 13 , further comprising a housing configured to retain the cam in position whereby the housing includes an inner side surface that houses the cam to prevent the cam from being inadvertently displaced an to limit rotation of the cam about only one axis; a biasing mechanism configured to bias the cam follower towards the cam to keep the cam follower in contact with the cam and configured to bias the inner shaft toward the distal end of the elongated body; and
a drive hub positioned at the proximal end, wherein the drive hub is configured to place the inner shaft in mechanical communication with a handpiece to impart rotary motion to the inner shaft and blade, as controlled by controls on the handpiece.

16. The rotary cutting device of claim 1 , wherein the connection system connecting the inner shaft to the blade comprises a pin and a slot that allow conversion of linear movement of the inner shaft into rotational movement of the blade to rotate the blade to the second, flip position upon linear movement of the inner shaft in relation to the outer tube the pin sliding in the slot to permit rotation of the blade, and wherein the blade is articulated to a nonparallel position relative to the longitudinal axis of the elongated body when the blade is in the second, flip position, and wherein the second, flip position, the cutting arris of the blade is exposed toward the proximal end of the elongated body for retrograde drilling of a hole when the blade is locked in the second, flip position.

17. A rotary cutting device comprising:
an elongated body having a distal end, a proximal end, and a longitudinal axis, the elongated body further comprising an outer tube and an inner shaft housed by the outer tube;
a blade at the distal end of the body, wherein the blade is configured to rotate from a first position generally aligned with the longi

Assignees

• Arthrex Inc

Inventors

• Adams Ken
• Garcia Daniela
• O'Quinn Philip S
• Bradley James P
• Beach William R

Classifications

• A61B2017/00367

  Details of actuation of instruments, e.g. relations between pushing buttons, or the like, and activation of the tool, working tip, or the like · CPC title

• A61B17/1675 Primary

  for the knee · CPC title

• A61B17/1631

  Special drive shafts, e.g. flexible shafts (A61B17/1642, A61B17/164 take precedence) · CPC title

• A61B17/1626 Primary

  Control means; Display units · CPC title

• A61B17/1624

  Drive mechanisms therefor · CPC title