IP Library › Granted Patent US 12,478,412
Granted Patent B2
US 12,478,412 · App. 17/989,797 · Granted Nov 25, 2025

Reducer locking mechanisms and methods of use

Inventors: Christopher M. Cromer (Boston, MA); Richard Fournier (New Bedford, MA); Eric Biester (Barrington, RI)
Assignee: Medos International Sàrl
A61B17/7086A61B17/1285A61B2017/00407
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Quick Facts
Patent No.
US 12,478,412
App. No.
17/989,797
Granted
Nov 25, 2025
Kind
B2
Abstract

Disclosed are reducer instrument locking mechanisms. They can be located near a center pivot joint of the reducer, thereby eliminating a ratchet at the reducer proximal end. The locking mechanisms can include a pawl or latch that travels with one handle from an open position to a closed position. The pawl can fall into a groove formed in an opposing handle such that handles of the reducer can be locked relative to one another, at least with regard to movement of the handles away from one another. When falling into the groove, the pawl can create an auditory and/or tactile indication that a sufficient amount of rod reduction has been achieved to allow for set screw insertion. After set screw insertion, the reducer locking mechanisms can be released to clear it of the groove and allow the reducer to return to its open position.

Claims (28)

1 . A surgical instrument, comprising:

a first handle having a proximal grip portion and a distal housing with a lumen extending from a proximal end to a distal end of the housing to define a length of the housing;

opposed arms extending distally from the housing that are configured to interface with an implant;

a reducer sleeve disposed around the opposed arms and configured to translate relative thereto;

a second handle having a proximal grip portion, the second handle being pivotably coupled to the housing along its length and the reducer sleeve such that moving the second handle toward the first handle causes distal translation of the reducer sleeve relative to the opposed arms;

a pawl pivotably coupled to the second handle distal the proximal grip portion of the second handle, the pawl being configured to ride over a portion of the length of the housing that includes a groove as the second handle is moved toward the first handle;

wherein the pawl is configured to seat in the groove and maintain a relative position of the first and second handles when the second handle is moved sufficiently toward the first handle.

2 . The instrument of claim 1 , further comprising a button extending from the pawl and configured to move the pawl clear of the groove when depressed.

3 . The instrument of claim 1 , further comprising a spring urging a distal portion of the pawl into the portion of the housing that includes the groove.

4 . The instrument of claim 1 , wherein the opposed arms define a tapering slot therebetween having a first distance between the opposed arms at a distal portion of the slot that is greater than a second distance between the opposed arms at a proximal portion of the slot.

5 . The instrument of claim 1 , wherein a distal end of at least one of the opposed arms includes a protrusion configured to extend into a recess of the implant.

6 . The instrument of claim 1 , wherein distal translation of the reducer sleeve relative to the opposed arms moves the opposed arms toward one another.

7 . The instrument of claim 1 , further comprising one or more links pivotably coupled to the second handle and the reducer sleeve.

8 . The instrument of claim 1 , further comprising a spring or torsion spring urging the first and second handle away from one another.

9 . The instrument of claim 1 , wherein the housing includes at least one protrusion formed thereon that abuts against the second handle at a fully open or a fully closed position of the first and second handles relative to one another.

10 . The instrument of claim 9 , wherein the at least one protrusion includes a first protrusion that abuts against the second handle at a fully closed position of the first and second handles, and wherein the first protrusion is separated from the second handle when the pawl is seated in the groove and maintaining a relative position of the first and second handles.

11 . A surgical method, comprising:

positioning an instrument in an unlocked configuration, the instrument having an implant engagement member, a reduction member having a channel therein for receiving the implant engagement member therethrough, a handle assembly being coupled to the reduction member and receiving the implant engagement member through a bore formed in a distal portion of the handle assembly, and a lock having a pawl disposed outside of a groove formed in the distal portion of the handle assembly, the handle assembly including a pair of handles pivotably coupled to one another;

positioning an implant between opposed arms of the implant engagement member; and

moving the pair of handles toward one another to position the instrument in a locked configuration;

wherein moving the pair of handles toward one another distally advances the reduction member relative to the implant engagement member to reduce a spinal fixation element into a receiving portion of the implant and moves the pawl into the groove of the handle assembly.

12 . The method of claim 11 , wherein moving the pair of handles toward one another includes overcoming a biasing force on the pair of handles and causing a linkage disposed between the pair of handles and the reduction member to advance the reduction member distally.

13 . The method of claim 11 , further comprising actuating a button coupled to the pawl to disengage the pawl from the groove and allow return of the device from the locked configuration to the unlocked configuration.

14 . The method of claim 11 , further comprising delivering a set screw to the implant through the bore of the handle assembly.

15 . The instrument of claim 1 , wherein each opposed arm includes a movable portion configured to deflect radially inward relative to the arm.

16 . The instrument of claim 15 , wherein the reducer sleeve includes a central ridge formed on an inner surface thereof that is configured to contact the movable portion of each opposed arm.

17 . The instrument of claim 15 , wherein each movable portion includes an inwardly-extending projection.

18 . The method of claim 11 , wherein distally advancing the reduction member relative to the implant engagement member deflects movable portions of each of the opposed arms of the implant engagement member radially inward such that the movable portions extend into a recess formed in the implant.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 30, 2023
From: CROMER, CHRISTOPHER M.; FOURNIER, RICHARD; BIESTER, ERIC
To: MEDOS INTERNATIONAL SARL
Reel/Frame 063161/0477 →
Continuity (3)
Provisional Application 63406137 · Sep 13, 2022
Provisional Application 63281506 · Nov 19, 2021
Related Publication 20230157736A1 · May 25, 2023
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