Assembly tool

Patent metadata

Field	Value
Publication number	US-2016206445-A1
Application number	US-201614995649-A
Country	US
Kind code	A1
Filing date	Jan 14, 2016
Priority date	Jan 15, 2015
Publication date	Jul 21, 2016
Grant date	—

Abstract

An instrument for assembling an implant on a neck. The implant and neck being coupled via a taper having a taper axis. The instrument includes a frame having a distal portion and a proximal portion, the distal portion of the frame including a retaining member adapted to engage a portion of the neck and a connector adapted to engage a corresponding feature of the stem. The instrument also includes a force applier retained in the proximal portion of the frame. The force applier includes a screw having a screw axis that is coaxial with the taper axis, wherein the screw is adapted to engage the implant. As the screw is turned, the force applier applies a force on the implant while the neck is held in place by the frame, thereby causing the tapers of the implant and neck to engage.

First claim

What is claimed is:

1 . An instrument for assembling an implant on a neck of a stem, the stem having a stem axis, the implant and neck being coupled via a taper having a taper axis, the instrument comprising:
a frame having a distal portion, a middle portion having a body axis that is coaxial with the stem axis, and a proximal portion, the distal portion of the frame including a retaining member adapted to engage a portion of the neck and a connector adapted to engage a corresponding feature of the stem; a force applier retained in the proximal portion of the frame, having an axis that is coaxial with the taper axis, wherein the force applier is adapted to engage the implant, wherein the force applier axis is not coaxial or parallel with the stem axis; wherein as the force applier is activated, the force applier applies a force on the implant while the neck is held in place by the frame, thereby causing the tapers of the implant and neck to engage.

2 . The instrument of claim 1 , wherein the force applier is a screw and an actuator coupled to the screw, wherein the actuator is adapted to enable a user to turn the screw.

3 . The instrument of claim 2 , wherein the frame includes a carriage, the carriage including a through hole for receiving the screw.

4 . The instrument of claim 3 , wherein the carriage is adjustable along a longitudinal axis and an axis perpendicular to the longitudinal axis.

5 . The instrument of claim 1 , wherein the proximal portion further includes a foot coupled to the force applier and the head, such that as the force applier is activated, the foot engages the head.

6 . The instrument of claim 1 , wherein the connector includes a threaded bolt and the corresponding feature on the stem is a threaded bore, such that the threaded bolt is adapted to engage a threaded bore on the stem.

7 . The instrument of claim 1 , wherein the bracket includes a protective insert to stabilize and maintain alignment of the frame.

8 . A system for hip orthopaedic surgery comprising:
a stem having a neck; a head, wherein one of the neck and the head have a male taper and the other of the neck and the head have a corresponding female taper, wherein when the male and female tapers are engaged, there is a taper axis; and an instrument for assembling the male and female tapers, the instrument including a frame having a distal portion and a proximal portion and a middle portion having a body axis that is coaxial with the stem axis, the distal portion of the frame including a retaining member adapted to engage a portion of the neck, the instrument further including a force applier retained in the proximal portion of the frame, having an axis that is coaxial with the taper axis, wherein the force applier is adapted to engage the implant, wherein as the force applier is activated, the force applier applies a force on the implant while the neck is held in place by the frame, thereby causing the tapers of the implant and neck to engage and wherein the force applier axis is not coaxial or parallel with the stem axis.

9 . The instrument of claim 8 , wherein the force applier is a screw and an actuator coupled to the screw, wherein the actuator is adapted to enable a user to turn the screw.

10 . The instrument of claim 9 , wherein the frame includes a carriage, the carriage including a through hole for receiving the screw.

11 . The instrument of claim 10 , wherein the carriage is adjustable along a longitudinal axis and an axis perpendicular to the longitudinal axis.

12 . The instrument of claim 9 , wherein the proximal portion further includes a foot coupled to the force applier and the head, such that as the force applier is activated, the foot engages the head.

13 . The instrument of claim 9 , wherein the distal portion of the frame further includes a threaded bolt adapted to engage a threaded bore on the stem.

14 . The instrument of claim 9 , wherein the bracket includes a protective insert to stabilize and maintain alignment of the frame.

15 . A method for assembling a taper between a neck of a stem and an implant, the taper having a taper axis and the stem having a stem axis, the method comprising:
using an assembly instrument, the assembly instrument including a frame having a distal portion, proximal portion, and a middle portion having a body axis that is coaxial with the stem axis, the distal portion of the frame including a retaining member, the instrument having a force applier, the force applier having an axis that is coaxial with the taper axis, wherein the force applier axis is not coaxial or parallel with the stem axis; inserting the neck into the retaining member of the frame; inserting the implant into the proximal portion of the frame; and applying a force to the implant along the force applier axis while the retaining member of the frame holds the neck in place, thereby assembling the tapers.

16 . The method of claim 15 , wherein the force applier is a screw and an actuator coupled to the screw, wherein the actuator is adapted to enable a user to turn the screw.

17 . The method of claim 16 , wherein the frame includes a carriage, the carriage including a through hole for receiving the screw.

18 . The method of claim 17 , wherein the carriage is adjustable along a longitudinal axis and an axis perpendicular to the longitudinal axis.

19 . The method of claim 15 , wherein the proximal portion further includes a foot coupled to the force applier and the head, such that as the force applier is activated, the foot engages the head.

20 . The method of claim 15 , wherein the distal portion of the frame further includes a threaded bolt adapted to engage a threaded bore on the stem.

21 . The method of claim 15 , wherein the bracket includes a protective insert to stabilize and maintain alignment of the frame.

Assignees

• Depuy Synthes Products Inc

Inventors

• Gheevarughese Vineetha
• Mccleary Larry

Classifications

• A61F2002/4638

  Tools for performing screwing, e.g. nut or screwdrivers, or particular adaptations therefor · CPC title

• A61F2/4637 Primary

  for connecting or disconnecting two parts of a prosthesis · CPC title

• A61F2240/001

  Designing or manufacturing processes · CPC title

• A61F2002/3652

  Connections of necks to shafts · CPC title

• A61F2002/30553

  for adjusting a position by translation along an axis · CPC title