Retractor with modular tap assemblies

Patent metadata

Field	Value
Publication number	US-2019216453-A1
Application number	US-201916366259-A
Country	US
Kind code	A1
Filing date	Mar 27, 2019
Priority date	Dec 20, 2011
Publication date	Jul 18, 2019
Grant date	—

Abstract

A retractor assembly includes a base, a first side assembly, a second side assembly, and a medial arm assembly. The first side assembly is coupled to a first side of the base and translates relative to the base along a first direction. The second side assembly is coupled to a second side of the base and configured to translate relative to the base along the first direction. The medial arm assembly is coupled to the base and can extend in an extension direction and retract in a retraction direction. The extension direction is opposite the retraction direction. The extension direction and the retraction direction are perpendicular to the first direction. The medial arm assembly includes a body, and a blade assembly. The blade assembly includes a receiving portion and a medial blade. The receiving portion and the medial blade are rotatably interfaced via a ball and a socket.

First claim

What is claimed is:

1 . A retractor assembly, comprising:
a base; a first side assembly coupled to a first side of the base and configured to translate relative to the base along a first direction; a second side assembly coupled to a second side of the base and configured to translate relative to the base along the first direction; and a medial arm assembly coupled to the base and configured to extend in an extension direction and retract in a retraction direction, wherein the extension direction is opposite the retraction direction and the extension direction and the retraction direction are perpendicular to the first direction, the medial arm assembly comprising:
a body; and
a blade assembly comprising a receiving portion and a medial blade, wherein the receiving portion and the medial blade are configured to rotatably interface via a ball and a socket.

2 . The retractor assembly of claim 1 , wherein the medial arm assembly comprises a frame configured to translate relative to the body, wherein the blade assembly is coupled to the frame.

3 . The retractor assembly of claim 2 , wherein the blade assembly is configured to rotatably interface with the frame via a hinge and pivot about a first axis extending through a center of the hinge.

4 . The retractor assembly of claim 1 , wherein the medial blade is configured to rotatably interface with the receiving portion about a rotational axis extending outwards from a center of the receiving portion.

5 . The retractor assembly of claim 4 , wherein the medial blade includes the ball and the receiving portion includes the socket, wherein the socket is configured to receive the ball.

6 . The retractor assembly of claim 5 , wherein the receiving portion comprises a locking member configured to selectably engage the ball to restrict rotation of the blade about the rotational axis.

7 . The retractor assembly of claim 6 , wherein the locking member includes a set screw configured to:
threadingly interface with an aperture of the receiving portion; engage a pin; and drive the pin into engagement with a corresponding surface of the ball; wherein the pin comprises a surface at one end configured to interface with an end of the set screw and a surface at a second end configured to interface with the corresponding surface of the ball.

8 . The retractor assembly of claim 2 , wherein the body comprises a locking mechanism configured to selectably transition between a locked mode and an unlocked mode, wherein the locked mode restricts translation of the frame relative to the body and the unlocked mode allows translation of the frame relative to the body.

9 . The retractor assembly of claim 2 , wherein the body comprises a releasable ratcheting mechanism configured to restrict translation of the frame in at least one of the extension direction and the retraction direction.

10 . A retractor assembly, comprising:
a base; a first side assembly; a second side assembly; and a medial arm assembly coupled to the base, the medial arm assembly comprising:
a medial arm body;
a frame configured to translate relative to the medial arm body through an aperture of the medial arm body; and
a medial blade assembly comprising a receiving member configured to hingedly interface at an end of the frame, a medial blade, and a body configured to rotatably interface with the receiving member, the medial blade comprising a first member configured to slidably interface with a channel of the body, and a second member configured to selectably deflect relative to the first member to enable repositioning of the blade along the channel.

11 . The retractor assembly of claim 10 , wherein the second member comprises one or more tabs configured to interface with one or more of a plurality of notches of the body and at least a portion of the first member is configured to slidably interface within the channel of the body.

12 . The retractor assembly of claim 11 , wherein the plurality of notches are disposed along an exterior surface of the body and define a plurality of predefined positions of the medial blade with respect to the body.

13 . The retractor assembly of claim 12 , wherein the second member is configured to selectably deflect between an engaged state to lock the medial blade at a current position relative to the body, and a disengaged state to allow translation of the medial blade relative to the body, wherein in the engaged state at least one of the one or more tabs is engaged with at least one of the plurality of notches, and in the disengaged state the one or more tabs are disengaged from the plurality of notches.

14 . The retractor assembly of claim 13 , wherein the one or more tabs are disposed at an end of the second member and wherein the first member and the second member are disposed a distance apart to define a space therebetween for receiving an adjustment member to transition the second member between the engaged state and the disengaged state.

15 . The retractor assembly of claim 14 , wherein the blade assembly is configured to receive the adjustment member and the second member is configured to deflect to transition between the engaged state and the disengaged state in response to a rotation of the adjustment member.

16 . The retractor assembly of claim 10 wherein the medial blade is configured to releasably interface with a modular tap assembly comprising a driver, a hoop, a sleeve, and a tap.

17 . A method of operating a retractor, comprising:
inserting a blade adjustment member into an opening defined between a first engagement member and a second engagement member of a medial blade of the retractor; rotating the blade adjustment member in a first direction to an adjustment position to cause the second engagement member to deflect relative to the first engagement member; and translating the medial blade to a desired location by translating the blade adjustment member while the blade adjustment member is in the adjustment position.

18 . The method of claim 17 , wherein rotating the blade adjustment member in a first direction comprises rotating the blade adjustment member a predetermined angular amount.

19 . The method of claim 18 , further comprising rotating the blade adjustment member in a second direction the predetermined angular amount, wherein the second direction is opposite the first direction.

20 . The method of claim 19 , wherein rotating the blade adjustment member in the first direction so that the second protrusion of the blade adjustment member causes the second engagement member to deflect causes one or more protrusions of the elongated member to disengage a set of notches.

Assignees

• Life Spine Inc

Inventors

• Predick Daniel
• Butler Michael S
• Zakelj Paul Christopher

Classifications

• A61B17/7082

  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

• A61B2017/0256

  for the spine · CPC title

• A61B17/7077 Primary

  for moving bone anchors attached to vertebrae, thereby displacing the vertebrae · CPC title

• A61B1/32

  Devices for opening or enlarging the visual field, e.g. of a tube of the body · CPC title

• A61B17/0206 Primary

  with antagonistic arms as supports for retractor elements · CPC title