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Patent metadata

Field	Value
Publication number	US-2021298810-A1
Application number	US-202016830377-A
Country	US
Kind code	A1
Filing date	Mar 26, 2020
Priority date	Mar 26, 2020
Publication date	Sep 30, 2021
Grant date	—

Abstract

Systems, instruments, and methods for operating a surgical instrument. The methods comprising: receiving at least a portion of an external object in a recess of a hollow shank; rotating a first shaft disposed within the hollow shank; using rotation of the first shaft to cause translational movement of a second shaft of the surgical instrument in a first direction away from the first shaft and along a central axis of the surgical instrument; applying a pushing force on the external object using the second shaft that is experiencing the translational movement; and causing translational movement of the second shaft in a second direction opposed from the first direction after the pushing force has been applied to the external object.

First claim

What is claimed is:

1 . A method for operating a surgical instrument, comprising:
receiving at least a portion of an external object in a recess of a hollow shank; rotating a first shaft disposed within the hollow shank; using rotation of the first shaft to cause translational movement of a second shaft along a central axis of the surgical instrument in a first direction towards the recess; applying a pushing force on the external object using the second shaft that is experiencing the translational movement; and causing translational movement of the second shaft in a second direction opposed from the first direction after the pushing force has been applied to the external object.

2 . The method according to claim 1 , further comprising causing at least one flexible tab portion of an inner shank part of the hollow shank to bend out and away from the inner shank part as the external object is being received in the recess.

3 . The method according to claim 2 , further comprising causing a protrusion of the at least one flexible tab portion to snap into a detent of the external object as the external object is being further received in the recess.

4 . The method according to claim 3 , further comprising using an outer shank part of the hollow shank to prevent bending of the at least one flexible tab portion out and away from the inner shank part after the protrusion of the at least one flexible tab portion has snapped into the detent of the external object.

5 . The method according to claim 1 , further comprising securing the surgical instrument to the external object after the external object has been received in the recess.

6 . The method according to claim 5 , wherein the surgical instrument is secured to the external object by sliding an outer shank part of the hollow shank in the first direction along an elongate length of the inner shank part of the hollow shank until a distal end of the outer shank part covers a portion of a distal end of the inner shank part.

7 . The method according to claim 6 , further comprising releasing the surgical instrument from the external object.

8 . The method according to claim 7 , further comprising resiliently biasing the outer shank part such that the outer shank part slides in the second direction along the elongate length of the inner shank part until the distal end of the outer shank part no longer covers the portion of the distal end of the inner shank part.

9 . The method according to claim 1 , wherein the translational movement of the second shaft part in the first and second directions is caused by a sliding engagement between ramped surfaces of the first and second shaft parts.

10 . The method according to claim 9 , wherein the translation movement of the second shaft in the second direction is caused further by a resilient member resiliently biasing the second shaft.

11 . A surgical instrument, comprising:
a hollow shank with a distal end having a recess sized and shaped to receive at least a portion of an external object; a first shaft that is rotatably disposed within the hollow shank; and a second shaft that is disposed in the hollow shank so as to be aligned with and in contact with the first shaft, where the second shaft is adapted to:
experience translational movement along a central axis of the surgical instrument in a first direction towards the recess, in response to rotation of the first shaft; and
experience translational movement along the central axis of the surgical instrument in a second direction opposed from the first direction, after traveling into the recess.

12 . The surgical instrument according to claim 11 , wherein the hollow shank comprises an inner shank part and an outer shank part, the inner shank part having at least one flexible tab portion capable of being bent out and away from the inner shank part as the external object is being received in the recess.

13 . The surgical instrument according to claim 12 , wherein a protrusion of the at least one flexible tab portion is capable of snapping into a detent of the external object as the external object is being further received in the recess.

14 . The surgical instrument according to claim 13 , wherein the outer shank part is used to prevent bending of the at least one flexible tab portion out and away from the inner shank part after the protrusion of the at least one flexible tab portion has snapped into the detent of the external object.

15 . The surgical instrument according to claim 11 , wherein the surgical instrument is secured to the external object positioned in the recess.

16 . The surgical instrument according to claim 15 , wherein an outer shank part of the hollow shank is adapted to slide in the first direction along an elongate length of the inner shank part of the hollow shank such that a distal end of the outer shank part covers a portion of a distal end of the inner shank part thereby facilitating a securement of the surgical instrument to the external object.

17 . The surgical instrument according to claim 16 , wherein the surgical instrument is releasable from the external object.

18 . The surgical instrument according to claim 17 , wherein the outer shank part is resiliently biased such that the outer shank part is adapted to slide in the second direction along the elongate length of the inner shank part until the distal end of the outer shank part no longer covers the portion of the distal end of the inner shank part.

19 . The surgical instrument according to claim 11 , wherein said ramped surfaces of the first and second shaft parts are slidably engaged.

20 . The surgical instrument according to claim 19 , wherein a resilient member resiliently biases the second shaft enabling the translation movement of the second shaft in the second direction.

Assignees

• Warsaw Orthopedic Inc

Inventors

• Butler Brian A
• Mills Aubrey R
• Italiaie Christel
• Wilfong Bret M
• Wilson Madeline G

Classifications

• B25D11/106

  cam member and cam follower having the same shape (B25D11/104 takes precedence) · CPC title

• B25D11/102

  the rotating axis of the cam member being coaxial with the axis of the tool · CPC title

• B25D11/005

  Arrangements for adjusting the stroke of the impulse member or for stopping the impact action when the tool is lifted from the working surface · CPC title

• A61B17/8886

  holding the screw head · CPC title

• A61B17/7082 Primary

  for driving, i.e. rotating, screws or screw parts specially adapted for spinal fixation, e.g. for driving polyaxial or tulip-headed screws · CPC title