Osteotomy instrument

Patent metadata

Field	Value
Publication number	US-10028772-B2
Application number	US-201514877587-A
Country	US
Kind code	B2
Filing date	Oct 7, 2015
Priority date	Oct 7, 2014
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

An osteotomy instrument includes a handle, a first arm assembly, a second arm assembly, a displacement mechanism, and a tuning mechanism. The first arm assembly is pivotably mounted to the handle. The first arm assembly includes a first fastener support configured to hold a fastener. The second arm assembly is pivotably mounted to the handle. The second arm assembly includes a second fastener support configured to hold a fastener. The displacing mechanism includes a dial disposed on the handle. The displacing mechanism is configured to laterally displace a distal end of the first arm assembly and second arm assembly away and towards each other. The dial actuates the displacing mechanism. The tuning mechanism is configured to change an angular position of the first fastener support with respect to the second fastener support.

First claim

It is claimed:

1. An osteotomy instrument comprising:
a handle having a bore,
a first arm assembly pivotably mounted to the handle about a first pivot pin, the first arm assembly having a first fastener support configured to hold a pair of fasteners;
a second arm assembly pivotably mounted to the handle about the first pivot pin, the second arm assembly having a second fastener support configured to hold a pair of fasteners;
a displacing mechanism having a dial disposed on the handle, the displacing mechanism further includes a stud having a threaded inner wall, the first pivot pin fixed to the stud, the stud slidingly engaged with the bore of the handle and configured to translate a rotation of the handle into the axial displacement of the stud in a direction coaxial to a longitudinal length of the handle, wherein the displacement of the stud laterally pivots the first and second arm assembly about the first pivot pin so as to displace a distal end of the first arm assembly and second arm assembly away and towards each other, the dial actuating the displacing mechanism; and
a tuning mechanism configured to change an angular position of the first fastener support with respect to the second fastener support.

2. The osteotomy instrument as set forth in claim 1 , wherein each of the first arm assembly and the second arm assembly includes an outer primary arm and an inner secondary arm, each of the outer primary arm and the inner secondary arm of the first arm assembly includes a distal end attached to the first fastener support, and each of the outer primary arm and the secondary primary arm of the second arm assembly includes a distal end attached to the second fastener support.

3. The osteotomy instrument as set forth in claim 2 , wherein, the dial further includes a threaded shaft configured to engage the bore so as to move the stud up and down the handle, and wherein movement of the stud up and down the handle laterally displaces fastener supports attached to distal ends of the first arm assembly and the second arm assembly away and towards each other.

4. The osteotomy instrument as set forth in claim 3 , wherein the displacing mechanism includes a first leg and a second leg, the first leg has a distal end pivotably attached to a proximal end of the inner secondary arm of the first arm assembly and the second leg has a distal end pivotably attached to a proximal end of the inner secondary arm of the second arm assembly, and
wherein the inner secondary arm of the first arm assembly and the inner secondary arm of the second arm assembly are pivotably attached to the handle by an inner secondary pin at a position on the inner secondary arm of the first arm assembly between the proximate end and the distal end and on the inner secondary arm of the second arm assembly between the proximate end and the distal end.

5. The osteotomy instrument as set forth in claim 4 , wherein the first leg has a proximate end opposite the distal end and the second leg has a proximate end opposite the distal end, the proximate end of the first leg and the proximate end of the second leg are pivotably attached to a stud pin, and the stud pin is attached to the stud,
wherein the movement of the stud displaces the stud pin which linearly displaces the proximate end of the first leg and the proximate end of the second leg, the linear displacement of the proximate end of the first leg and the proximate end of the second leg pivots the inner secondary arm of the first arm assembly and the inner secondary arm of the second arm assembly about the inner secondary arm pin which laterally displaces the distal end of the first arm assembly and the distal end of the second arm assembly away and towards each other.

6. The osteotomy instrument as set forth in claim 2 , wherein the tuning mechanism includes a pair of brackets having an interior surface with teeth, a tuning dial having a shaft, a pair of wheel gears attached to the shaft, each of the pair of wheel gears engaged with a respective one of the pair of brackets, the tuning dial rotatably mounted to the handle, and
wherein the outer primary arm of the first arm assembly includes a proximate end pivotably attached to one of the pair of brackets, and the outer primary arm of the second arm assembly includes a proximate end pivotably attached to the other of the pair of brackets.

7. The osteotomy instrument as set forth in claim 6 , wherein the tuning mechanism includes a carrier fixedly secured to the handle, the housing having a pair of guide slots, the pair of brackets slidably received within the pair of guide slots, the carrier defining a throughhole through which the shaft of the tuning dial extends, and
wherein actuation of the tuning dial rotates the pair of gear wheels which displaces the pair of brackets within the pair of slots of the carrier to displace and pivot the proximate end of the outer primary arm of the first arm assembly and the proximate end of the outer primary arm of the second arm assembly to change the angular position of the first fastener support with respect to the second fastener support.

8. The osteotomy instrument as set forth in claim 7 , wherein the distal end of the inner secondary arm of the first arm assembly is pivotably attached to the first fastener support and the distal end of the inner secondary arm of the second arm assembly is pivotably attached to the second fastener support, and wherein the outer primary arm of the first arm assembly is fixedly secured to the first fastener support and the outer primary arm of the second arm assembly is fixedly secured to the second fastener support.

9. The osteotomy instrument as set forth in claim 8 , wherein each of the first fastener support and the second fastener support includes a receiver adapted to receive one of the pair of fasteners, each of the first fastener support and the second fastener support includes an ejector mechanism configured to retain and eject the receiver from the first and second fastener supports.

10. The osteotomy instrument as set forth in claim 9 , wherein the ejector mechanism includes a biasing member and an engagement member formed on a lever pivotably attached to each of the first fastener support and the second fastener support, the lever is pivotal between an engaged position and a disengaged position, the biasing member biases the lever towards the engaged position, and
wherein the engagement member is configured to retain the receiver within the first fastener support and the second fastener support when in the engaged position, wherein actuation of the lever disengages the engagement member from the receiver.

11. The osteotomy instrument as set forth in claim 10 , wherein each of the first fastener support and the second fastener support includes a notch, and wherein in the engaged position the engagement member is received within the notch of the receiver to retain receiver against an undercut formed on the receiver.

12. An osteotomy instrument comprising:
a handle having a bore;
a first arm assembly pivotably mounted to the handle about a first pivot pin, the first arm assembly having a first fastener support configured to hold a fastener;
a second arm assembly pivotably mounted to the handle about the first pivot pin, the second arm assembly having a second fastener support configured to hold a fastener; and
a displacing mechanism having a dial disposed on the handle, the displacing mechanism further includes a stud having a threaded inner wall, the first pivot pin fixed to the stud, the stud slidingly engaged with the bore of the handle and configured to translate a rotation of the handle into the axial displacement of the stud in a

Assignees

• Alphatec Spine Inc

Inventors

• Meyer Nathan

Classifications

• A61B17/7032

  Screws or hooks with U-shaped head or back through which longitudinal rods pass · CPC title

• A61B17/7077 Primary

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